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1
Benaddi, Tarik. "Sparse graph-based coding schemes for continuous phase modulations." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/16037/1/Benaddi_Tarik.pdf.
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The use of the continuous phase modulation (CPM) is interesting when the channel represents a strong non-linearity and in the case of limited spectral support; particularly for the uplink, where the satellite holds an amplifier per carrier, and for downlinks where the terminal equipment works very close to the saturation region. Numerous studies have been conducted on this issue but the proposed solutions use iterative CPM demodulation/decoding concatenated with convolutional or block error correcting codes. The use of LDPC codes has not yet been introduced. Particularly, no works, to our knowledge, have been done on the optimization of sparse graph-based codes adapted for the context described here. In this study, we propose to perform the asymptotic analysis and the design of turbo-CPM systems based on the optimization of sparse graph-based codes. Moreover, an analysis on the corresponding receiver will be done.
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Damodaran, Kanagaraj. "Spectrally Efficient Concatenated Convolutional Codes with Continuous Phase Modulations." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606239.
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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>We develop bandwidth-efficient serially concatenated coded (SCC) continuous phasemodulation (CPM) techniques for aeronautical telemetry. The concatenated code consists of an inner and an outer code, separated by an interleaver, and is decoded using relatively simple near-optimum iterative decoding algorithms. CPM waveforms such as shaped-offset quadrature phase shift keying (SOQPSK) and pulse code modulation/ frequency modulation (PCM/FM), which are currently used in military satellite and aeronautical telemetry standards, can be viewed as inner codes due to their recursive nature. For the outer codes, we apply serially concatenated convolutional codes (SCCC) because of their large coding gains, high coding rates, and because their decoding algorithms are readily implemented. High-rate codes are of special interest in aeronautical telemetry applications due to recent reductions in available spectrum and ever-increasing demands on data rates. We evaluate the proposed coding schemes with a large set of numerical simulation results and make a number of recommendations based on these results.
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Kumaraswamy, Dileep. "ON REDUCED COMPLEXITY TECHNIQUES FOR BANDWIDTH EFFICIENT CONTINUOUS PHASE MODULATIONS IN SERIALLY CONCATENATED CODED SYSTEMS." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604543.
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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Serially concatenated coded (SCC) systems with continuous phase modulations (CPMs) as recursive inner codes have been known to give very high coding gains at low operative signal to noise ratios (SNRs). Moreover, concatenated coded systems with iterative decoding approach the bit error rate (BER) bounds given by the maximum likelihood (ML) criterion. Although SCC systems by themselves are reduced complexity systems when compared to the ML decoding, when very highly bandwidth efficient CPMs such as pulse code modulation /frequency modulation (PCM/FM) is used [1], they present a problem of extremely high decoding complexity at the receiver. The complexity of a CPM is described by the size of its trellis which is a function of the modulation index, the cardinality of the source alphabet and the length of the frequency pulse used. The surveyed complexity reduction techniques adopt approximations which will reduce the size of the trellis with minimal expense of power. In this paper, we present reduced complexity approaches to sub-optimally decode SCC PCM/FM by mainly two approaches - 1) Frequency pulse truncation. 2) Decision feedback.
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Othman, Rami. "Study of reception techniques for aeronautical telemetry modulations." Thesis, CentraleSupélec, 2019. http://www.theses.fr/2019CSUP0012.
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La télémesure aéronautique est un système utilisé pendant la phase des essais en vol qui consiste à transmettre en temps-réel les données mesurées à bord de l'avion vers une station sol par le biais d'une liaison radiofréquence. Elle est une opération critique visant à surveiller le comportement de l’avion et à garantir la sécurité du pilote. La conception et les performances des émetteurs et des récepteurs ont été améliorées au fil des années mais tout en gardant la même famille de modulation utilisée pour transmettre les données. Ces données sont modulées par une modulation à phase continue (CPM) car cette dernière possède une enveloppe complexe constante, ce qui permet l’emploi des amplificateurs de puissance dans leur régime de saturation sans distordre le signal. Cependant, contrairement aux modulations classiques, la modulation CPM n’est pas une fonction linéaire des symboles transmis, ce qui rend la tâche de la démodulation complexe surtout quand on considère des scenarii assez compliqués tels que la présence des multi trajets ou bien l’emploi d’un système multi-antennes. Dans cette thèse, on se focalise sur une modulation appelée « Shaped Offset Quadrature Phase Shift Keying telemetry group » (SOQPSK-TG) qui commence à être de plus en plus populaire en télémesure aéronautique. Cette modulation appartient à une famille particulière de CPM car elle transmet des symboles ternaires au lieu de binaires. Dans ce travail, nous développons différents algorithmes de réception pour cette modulation en considérant différents scenarii afin de garantir un lien de télémesure permanent. Les solutions proposées offrent des performances attrayantes tout en gardant une complexité raisonnable pour une implémentation en temps-réel<br>Aeronautical telemetry is a system used during the flight testing phase to monitor the behaviour of the plane by transmitting in real-time the aircraft dynamics from the aircraft to the ground station over a radio-frequency link. It is a critical process that requires highly reliable systems to ensure the pilot's safety. The design and the performance of the transmitting/ receiving equipment have been progressively upgraded over the years, and they mainly rely on continuous phase modulations (CPM) to convey the data. CPM is transmitter friendly because it has a constant complex envelope and therefore power amplifiers can be used at their saturation mode without distorting the signal. However, due to the nonlinear nature of this modulation, it can make the demodulation a hard task especially when considering complex scenarios such as the presence of multipath or the use of multiple antenna transmitters. In this PhD thesis, we focus on shaped offset quadrature phase-shift keying telemetry group (SOQPSK-TG) whose use is getting more and more popular in aeronautical. This modulation belongs to a particular CPM family since it transmits ternary symbols instead of binary ones. In this work, several reception algorithms have been developed for this modulation under different scenarios to ensure the availability of aeronautical telemetry link. These solutions offer excellent power efficiency without prohibitive complexity
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Desombre, Paul. "Couche physique pour les communications sous-TeraHertz." Electronic Thesis or Diss., CentraleSupélec, 2024. http://www.theses.fr/2024CSUP0012.
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Dans cette thèse nous étudions une nouvelle mise en œuvre des communications sous-THz ([90 - 300] GHz de fréquence porteuse) utilisant la technologie photonique pour la génération de fréquence porteuse. Cette étude s'inscrit dans le projet WASSAP, qui a pour but de doter à la région Bretagne un démonstrateur de communications sous-THz performant : très haut débit (de plusieurs Gbits/s à plusieurs dizaines de Gbits/s) et longues portées (plusieurs km de portées de communications sont théorisés). Dans un premier temps, les enjeux et verrous technologiques des communications sous-THz sont expliqués. Ensuite, les modulations numériques que nous avons considérées dans ce projet sont détaillées puis comparées entre elles dans un environnement de simulations prenant en compte le bruit de phase induit par les générateurs de fréquences. Cinq modulations sont sélectionnées selon leurs performances. Suite à cela, les non-linéarités optiques subies par le signal sont étudiées et un modèle numérique de simulation est proposé. Ce modèle est utilisé pour quantifier les effets des non-linéarités sur les cinq modulations sélectionnées. Nous montrons que les CPM sont invulnérables à ces effets. Ensuite, nous nous servons de ce modèle conjointement à un bilan de liaison sous-THz pour étudier la faisabilité des communications longues portées avec les CPM. Finalement, une preuve de concept est donnée, où les cinq modulations considérées sont testées dans un environnement expérimental<br>This thesis studies a new implementation of sub-THz communications ([90 - 300] GHz) using photonic technology for carrier frequency generation. This study is part of the WASSAP project, which aims to provide the Brittany region with a high-performance sub-THz communications demonstrator: very high data rates (from several Gbits/s to several tens of Gbits/s) and long ranges (several km of communications ranges are theorized). First, the challenges and technological obstacles of sub-THz communications are explained. Then, the digital modulations we have considered in this project are detailed and compared in a simulation environment that considers the phase noise induced by frequency generators. Five modulations are selected according to their performance. Following this, the optical non-linearities experienced by the signal are studied, and a numerical simulation model is proposed. This model is used to quantify the effects of non-linearities on the five selected modulations. We show that CPMs are invulnerable to these effects. Next, we use this model with a sub-THz link budget to study the feasibility of long-range communications with CPMs. Finally, a proof-of-concept is given, where the five modulations considered are tested in an experimental environment
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Silvester, Anna-Marie. "Space-time continuous phase modulation." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/14721.
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The combination of Space-Time (ST) coding and Continuous-Phase Modulation (CPM) produces a low power, energy efficient communication scheme suitable for wireless transmission. Space-time coding increases the reliability of transmission, and continuous-phase modulation (CPM) has the
potential to provide considerable energy savings. CPM is a modulation technique that involves the transmission of a signal with continuous-phase and a constant envelope, where the continuous-phase property produces a very bandwidth efficient signal, and the constant-envelope property enables non
linear (and thus energy efficient) signal amplification. The ST-CPM code is of special interest for wireless sensors because in the wireless sensor network environment energy consumption is highly constrained. The combination of ST codes and CPM is non-trivial and thus ST-CPM codes based upon
block-based orthogonal and diagonal signal matrices are presented. These codes are forms the basis of a distributed ST-CPM code. The distributed ST codes are designed to operate in wireless networks containing a large set of nodes, of which only a small a priori unknown subset will be active at any
time. The devised distributed ST-CPM scheme combines the ST-CPM code with a diagonal signaling matrix, (commonly assigned to all relay nodes) with signature vectors(uniquely assigned to nodes). The energy consumption of the proposed distributed ST-CPM scheme is compared with that of a distributed ST linear modulation (LM) scheme. The distributed ST-CPM scheme is shown to
outperform the distributed ST-LM scheme for all but short-range transmission. Finally, a serially concatenated code for ST-CPM is proposed. The concatenated code consists of the diagonal signalling matrix as the inner code, and a class of double parity check (DPC) codes as the outer code. The
resulting concatenated codes that are formed from the ST-CPM code and a DPC code are shown to provide performance close to capacity, and to provide performance superior to that provided by the more common combination of CPM, or ST-CPM schemes with convolutional codes.
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Harrold, William. "Detection of continuous phase modulation." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235856.
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The use of coded modulations such as continuous phase modulation (CPM) can improve the power and bandwidth efficiency of digital communication links. The price paid for these gains is in increased receiver complexity. The power efficiency attainable with the highly redundant signal sets employed by coded modulations becomes limited by the ability of the receiver to achieve accurate carrier phase synchronisation. Power efficiency is assessed in terms of the bit error rate performance in white Gaussian noise. A new CPM detector called the partially coherent Viterbi algorithm (PCVA) is introduced which tries to preserve the power efficiency in the presence of mild phase perturbations. The detector employs the Viterbi algorithm with a new partially coherent decision metric. Carrier phase estimates are derived dynamically from the detector's own survivor paths. In the presence of phase jitter, the PCVA is superior to a Viterbi decision directed phase locked loop. The PCVA could be applied to the detection of modulation schemes other than CPM. An error analysis of the PCVA in the absence of phase jitter provides a new and more realistic way of assessing the relative merits of various CPM schemes. Unmerged error events have been found to occur when CPM is detected with carrier phase uncertainty. The carrier phase estimator pulls in the residual phase error in such cases. A reduced state Viterbi algorithm has been examined when using the partially coherent decision metric. Receiver complexity reduction is still possible even when the detector is not coherent. A method of acquiring the carrier frequency accurately from the received CPM signal is described. The other main research goal has been the development of a new low signal-to-noise ratio (SNR) error probability analysis for coherently detected CPM. CPM is designed for use on power limited channels, but the existing error probability analysis is only accurate at high SNR. The problem at low SNR is that several error events become significant, not just the one at minimum squared Euclidean distance. The new analysis considers many events and makes statistical allowance for their pairwise interaction. The probability of events intersecting and reclosing each other has not been analysed before. This work applies to maximum likelihood sequence detection on a memoryless channel in general. A new survey of CPM error performance is made and proves the existing minimum distance results to be often optimistic especially at low and intermediate signal-to-noise ratios. The new approximation is closer to the simulated error rates where these are available. The coherent error analysis involves some computation but it is still approximately three orders of magnitude faster than simulation.
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Kleyn, Werner Frederick. "Decoding algorithms for continuous phase modulation." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/6984.
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Includes bibliographical references.<br>Continuous Phase Modulation (CPM) possesses characteristics that make it very attractive for many applications. Efficient non-linear power amplifiers can be used in the transmitters of constant envelope CPM schemes. CPM also allows for the use of simple limiters in the demodulator rather than linear receivers with gain control. These characteristics not only increases the life of the power source, but it improves circuit reliability since less heat is generated. In some applications, such as satellite transmitters, where power and circuit failure is very expensive, CPM is the most attractive choice. Bandwidth efficiency, also, is very attractive, and improves as the order of the scheme increases (together with reduction in modulation index). Still further improvement is obtained through pulse shaping which normally result in partial response schemes as opposed to full-response (CPFSK) schemes. The inherent memory or coding gain of CPM increases the minimum distance, which is a figure of merit for a scheme's error performance. The length of the inherent memory is the constraint length of the scheme. Successful extraction of this inherent memory result in improved power efficiency. By periodic variation of the modulation index as in multi-h CPFSK, a sub class of CPM, coding gain or inherent memory can be significantly improved. CPM demodulation is also less sensitive to fading channels than some other comparable systems. Well-known schemes such as GSM digital mobile systems, DECT and Iridium all use some form of CPM to transport their information. These implementations are normally pulse-shaped FSK or MSK and are used for the reasons above, except that their receivers do not always exploit the inherent memory. Unfortunately, though, when one wants to exploit the inherent memory of higher level CPM schemes, all these attractive characteristics are offset by the complexity of the receiver structures which increases exponentially in complexity as the order or constraint length is increased. Optimum receivers for binary CPFSK were first described by Osborne and Luntz [19] in 1974 and their research was later extended by Schonhoff [26] to include M-ary CPFSK. These receivers evaluate likelihood functions after observing the received signal for a certain number of symbol intervals, say N, then calculate a set of likelihood parameters on which a likelihood ratio test regarding the first symbol is based. These receivers are complex and impractical but does provide valuable insight. This is called maximum likelihood sequence estimation (MLSE). Another way to do MLSE would be to correlate all possible transmitted sequences (reference signals at the demodulator) over a period of N symbol intervals with the received sequence. The first symbol of the reference sequence with which the received sequence has the largest correlation, is decoded as the most likely symbol. The number of reference sequences required at the receiver grow very fast as the observation period increases. Up to now, only the lowest order CPM schemes have feasible optimal receiver structures. The only practical solution thus far for the MLSE of higher order schemes is the use of software implementations of which the Viterbi algorithm is the most popular. Through recursive or sequential processing of data per interval, the number of matched filters required can be reduced. However, for schemes beyond a certain order and constraint length, the Viterbi algorithm's consumption of computational resources reduces its feasibility. Research into CPM is focused mainly on the quest for simpler demodulators and decoders or lower order schemes with better coding gain. In order to gain further insight into CPM, research is approached from different angles.
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Perrins, Erik Samuel. "Reduced Complexity Detection Methods for Continuous Phase Modulation." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd969.pdf.
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Zhao, Qing. "Advanced Synchronization Techniques for Continuous Phase Modulation." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10486.
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The objective of this research work is to develop reliable and power-efficient synchronization algorithms for continuous phase modulation (CPM). CPM is a bandwidth and power efficient signaling scheme suitable for wireless and mobile communications. Binary CPM schemes have been widely used in many commercial and military systems. CPM with multilevel symbol inputs, i.e., M-ary CPM, can achieve a higher data rate than binary CPM. However, the use of M-ary CPM has been limited due to receiver complexity and synchronization problems. In the last decade, serially concatenated CPM (SCCPM) has drawn more attention since this turbo-like coded scheme can achieve near Shannon-limit performance by performing iterative demodulation/decoding. Note that SCCPM typically operates at a low signal-to-noise ratio, which makes reliable and power-efficient synchronization more challenging. In this thesis, we propose a novel timing and phase recovery technique for CPM. Compared to existing maximum-likelihood estimators, the proposed data-aided synchronizer can achieve a better acquisition performance when a preamble is short or channel model errors are present.
We also propose a novel adaptive soft-input soft-output (A-SISO) module for iterative detection with parameter uncertainty. In contrast to the existing A-SISO algorithms using linear prediction, the parameter estimation in the proposed structure is performed in a more general least-squares sense. Based on this scheme, a family of fixed-interval A-SISO algorithms are utilized to implement blind iterative phase synchronization for SCCPM. Moreover, the convergence characteristics of iterative phase synchronization and detection are analyzed by means of density evolution. Particularly, an oscillatory convergence behavior is observed when cycle slips occur during phase tracking. In order to reduce performance degradation due to this convergence fluctuation, design issues, including delay depth of the proposed algorithms, iteration-stopping criteria and interleaver size, are also discussed. Finally, for completeness of the study on phase synchronization, we investigate the error probability performance of noncoherently detected full-response CPM, which does not require channel (or phase) estimation.
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Szeto, Victor F. "Iterative decoding of coded continuous phase modulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/MQ40953.pdf.
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Saleem, Sajid. "Frequency-domain equalization for continuous phase modulation." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50391.
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Continuous phase modulation~(CPM) is a non-linear, constant-envelope modulation scheme with memory, known for its bandwidth and power efficiency. Multi-h CPM uses multiple modulation indices in successive symbol intervals to improve the error performance as compared to single-h CPM~(basic CPM that utilizes only a single modulation index). One of the major applications of multi-h CPM is in aeronautical telemetry systems. Modern aeronautical devices host an increasing number of sensors, which can transmit flight testing data to the ground station. However, this excess data transfer increases the intersymbol interference, and thus channel equalization is required at the receiver. The objective of our research is to propose low-complexity frqeuency-domain equalization~(FDE) techniques for multi-h CPM waveforms. For a modulation scheme with memory, such as CPM, the cyclic constraint on the FDE block necessitates the use of an extra segment of symbols, called intrafix or tail segment. We have used very simple geometric arguments to derive upper and lower bounds on the length of the intrafix in terms of the parameters of the modulation scheme and the Frobenius number. It is concluded that the length of the intrafix for multi-h CPM schemes is typically shorter than those required for single-h modulation schemes. We propose two receiver architectures; one uses a matched filter front end, while the other utilizes a fractional sampling front end. Various simplifications are proposed for each architecture, and the trade-off between receiver complexity and performance is analyzed and verified through detailed simulation studies.
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Damodaran, Kanagaraj. "Turbo Product Code with Continuous Phase Modulation." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606222.
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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>A basic problem statement in aeronautical telemetry has been to develop communication systems with good detection efficiency coupled with good spectral efficiency. Shaped-offset quadrature phase shift keying (SOQPSK) is a spectrally more efficient form of continuous phase modulation (CPM) as opposed to pulse code modulation/frequency modulation (PCM/FM). With these modulation techniques, we propose concatenated turbo product code (TPC) with CPM as a solution to our above problem statement. The performance of this turbo product coded CPM (TPC-CPM) system is simulated under coherent and non-coherent demodulation. Finally we present simulation results showing impressive coding gain performance of TPC-CPM over the AWGN channel.
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Aboujaoude, Andrea E. "Nanopatterned Phase-Change Materials for High-Speed, Continuous Phase Modulation." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1538243834791942.
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Maw, Rachel Leigh. "Space-time Coded Systems with Continuous Phase Modulation." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1185.
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Space-time coded systems developed in the last ten years have been designed primarily using linear modulation. Non-linear continuous phase modulation has desirable constant envelope properties and considerable potential in space-time coded systems. The work in this thesis is focussed on developing and analysing an integrated space-time coded continuous phase modulated (STC-CPM) system. The coding of the space-time encoder and the modulation is incorporated into a single trellis encoder. This allows state combining, which leads to complexity reduction due to the reduced number of states. Design criteria for STC-CPM are summarized and the Euclidean distance is shown to be important for code design. The integrated STC-CPM system design enables systematic spacetime code searches that find optimal space-time codes, to be easily implemented. Optimal rate-1/2 and rate-2/3 space-time codes are found by maximizing the system's minimum squared Euclidean distance. These codes can provide high throughput and good coding gains over un-optimized full rank codes, such as delay diversity, in a quasi-static flat fading environment. Performance bounds are developed using a union bound argument and the pairwise error probability. Approximations of the bounds are evaluated. These truncated upper bounds predict the slopes of the simulated performance curves at low error rates.
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Chapelle, Gregory P. "Continuous phase modulation for the indoor wireless channel /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9824644.
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Detwiler, Thomas Frederick. "Continuous phase modulation for high speed fiber-optic links." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42867.
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Fiber-optic networks are continually evolving to accommodate the ever increasing data rates demanded by modern applications and devices. The current state-of-the art systems are being deployed with 100 Gb/s rates per wavelength while maintaining the 50 GHz channel spacing established for 10 Gb/s dense wavelength division multiplexed (DWDM) systems. Phase modulation formats (in particular quadrature phase shift keying - QPSK) are necessary to meet the spectral efficiency (SE) requirements of the application. The main challenge for phase modulated optical systems is fiber nonlinearities, where changes in intensity of the combined optical signal result in changes to the fiber's refractive index. Limiting launch power is the primary means to avoid dramatic intensity fluctuations, a strategy which in turn limits the available signal-to-noise ratio (SNR) within the channel.
Continuous phase modulation (CPM) is a format in which data is encoded in the phase, while the amplitude is constant throughout all transmission (even during transitions between symbols). With the goal of reducing the impact of nonlinearities, the purpose of this research was to identify a set of CPM signals best suited for high speed fiber-optic transmission, and quantify their performance against other formats. The secondary goal was to identify techniques appropriate for demodulation of high speed fiber-optic systems and implement them for simulation and experimental research.
CPM encompasses a number of variable parameters that combine to form an infinite number of unique schemes, each of which is characterized by its own SE, minimum distance, and implementation complexity. A method for computing minimum distance of DWDM-filtered CPM formats is presented and utilized to narrow down to a range of candidate schemes. A novel transmitter design is presented for CPM signal generation, as well as a number of novel reception techniques to achieve proper demodulation of the CPM signal from the coherent optical receiver. Using these methods, the identified range of candidate schemes was compared in simulation to the conventional QPSK format, showing that some modest gain can be expected from CPM.
Through these and other simulations, it is revealed that fiber nonlinearities depend on the aggregate sum of all wavelengths rather than the imposition of each separate carrier on its neighbors. Therefore the constant envelope of CPM does not directly impact the nonlinearities since multiple carriers will photonically interfere and result in intensity fluctuations regardless of modulation format. Additionally, dispersive effects in fiber decompose the underlying channels so that the intensity throughout propagation is nearly Gaussian distributed, regardless of format. The benefits gained from CPM are thus limited to schemes that attain a higher minimum distance than alternative formats (in the given channel passband), and for optically compensated links in which low dispersion is maintained throughout the fiber link.
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Tennant, John M. "Convolutional coding combined with partial response continuous phase modulation." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316781.
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SANTIAGO, CARLOS ALBERTO FERREIRA. "RESTRICTED SEARCH DECODING OF SEVERE FILTERED CONTINUOUS PHASE MODULATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9261@1.
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EMPRESA BRASILEIRA DE TELECOMUNICAÇÕES<br>No presente trabalho é examinada a decodificação de
esquemas CPM (Continuous Phase Modulation) filtrados
severamente (filtragem com resposta impulsional infinita)
utilizando-se algoritmo M, um algoritmo de busca limitada.
A estrutura formada pelo modulador CPM seguido do filtro é
tratada como um esquema que realiza modulação codificada
com utilização eficiente de faixa. A caracterização da
modulação através de estados requer um número infinito de
estados.
O esquema é analisado através de simulação de
sistema modulado em tempo discreto com processamento
digital. A utilização de filtro digital permite uma
caracterização de estados simplificada em relação a
trabalhos anteriores.
Uma versão simplificada do algoritmo M é analisada
neste trabalho. Através de simulação realiza-se a análise
do desempenho do sistema assim como do comportamento do
algoritmo M na sua versão simplificada.<br>Decoding of severely filtered CPM schemes with infinite
impulse response filters using a limited search algorith
(M-Algorithm ) is examined in this thesis. The structure
composed by the CPM modulator followed by the filter is
treated as a bandwidth efficient coded modulation scheme.
The modulation requires a infinite state description.
Analysis of the system is done by computer
simulation. The analysed system is discret time modeled
and uses digital signal processing techniques. This allows
a simplified state description of the modulation scheme.
A simplified version of the M-algorithm is
analysed in the thesis. Analysis of the system performance
as well as the M-algorithm (simplified version) behavior
is done by simulation.
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Tang, Weiyi. "A receiver for continuous phase modulation in Walsh signal space." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/NQ32891.pdf.
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Damodaran, Kanagaraj. "SERIALLY CONCATENATED HIGH RATE CONVOLUTIONAL CODES WITH CONTINUOUS PHASE MODULATION." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604494.
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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>We propose serially concatenated convolutional codes with continuous phase modulation for aeronautical
telemetry. Such a concatenated code has an outer encoder whose code words are permuted by an
interleaver, and a modulation, which is viewed as a code and takes the interleaved words as its input and
produces the modulated signal. Since bandwidth expansion is a concern when coding is introduced, we
focus on high rate punctured codes of rates 2/3 through 9/10. These are obtained by puncturing the basic
rate 1/2 convolutional codes with maximal free distance. At the receiver end we use a reduced complexity
iterative decoding algorithm which is essentially a soft input soft output decoding algorithm. These simple
highly powerful concatenated codes produce high coding gains with minimum bandwidth expansion.
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Zhu, Yunlong. "Exploration of Interferometric Detection Methods based on Continuous Phase Modulation." Thesis, Troyes, 2018. http://www.theses.fr/2018TROY0024.
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Dans cette thèse, nous nous intéressons aux signaux interférométriques à modulation de phase continue, dans le but de développer des dispositifs de détection performants et originaux pour des applications en mécanique et en optique. Nous présentons d'abord plusieurs des techniques de modulation et démodulation employées dans ce contexte. Nous nous focalisons sur les modulations de phase sinusoïdales (SPM), qui sont particulièrement avantageuses pour les dispositifs de modulation les plus largement accessibles. Nous proposons alors des solutions au problème de synchronisation ainsi qu'au problème éventuel de modulation d'amplitude concomitante à la modulation SPM. Ces techniques de démodulations sont ensuite appliquées à 3 dispositifs expérimentaux développés au cours de cette thèse. Il s'agit d'abord d'un dispositif d'holographie digitale compact sans lentille, mettant en œuvre une modulation SPM simple, pour l'imagerie et la mesure de déplacement. Nous utilisons ensuite une technique de modulation à double fréquence pour réaliser des mesures bidimensionnelles de champ de déformation, à l'aide d'un dispositif ESPI (interférométrie de speckle) original. Cette approche permet une mesure simultanée dans les 2 directions du plan à l'aide d'un seul système de laser et caméra. Finalement, nous présentons un instrument de type SPR (Surface Plasmon Resonance) compact mettant en œuvre une détection interférométrique SPM par modulation de longueur d'onde, dans lequel la modulation d'amplitude est prise en compte avec succès<br>In this thesis, interference signals with continuous phase modulations are theoretically and experimentally analyzed in order to develop cost-efficient solutions for sensing application in mechanics and optics.Several common phase modulation functions and phase retrieval algorithms are presented. We mainly focus on sinusoidal phase modulation (SPM), which is especially attractive for the most accessible modulators (e.g. electro-optical or piezoelectrical modulators). In such case, the demodulation process must handle synchronization issue as well as a possible intensity modulation induced by the SPM. Mathematical solutions are proposed in this context. These demodulation techniques are then applied to three experimental devices developed during this thesis. First of all, a lens-less co-axis digital holography setup has been built, and SPM has been applied for imaging and displacement measurement. Then we use a dual-frequency modulation technique to perform two-dimensional deformation field measurements using an original ESPI (Electronic Speckle Pattern Interferometry) device. This approach allows for simultaneous measurement of the displacement along two different axes using a single laser and a single camera. Finally, we present a compact SPR (Surface Plasmon Resonance) instrument implementing SPM interferometric detection through wavelength modulation, where the amplitude modulation is successfully taken into account
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Hesse, Matthias. "L2-orthogonal space-time code design for continuous phase modulation." Nice, 2010. http://www.theses.fr/2010NICE4008.
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Orthogonal Space-Time block codes (STBC) have been a popular way to implement wireless communications systems with full diversity and simple decoupled maximum-likelihood decoding. However, all these codes rely on pointwise orthogonality which leads to a well-known degradation of data rate for more than two antennas. In this thesis, we introduce the concept of L2-orthogonality for non-linear Space-Time codes (STC). Our approach generalizes code design based on pointwise orthogonality. Hence, we are able to derive new codes with the same advantages as pointwise orthogonal STBC, i. E. Low decoding complexity and diversity gain. At the same time, we are no longer limited by the restrictions of pointwise orthogonal codes, namely the reduction in data rate. Actually, we show how to construct full rate codes for any arbitrary number of transmit antennas. More precisely, a family of codes for continuous phase modulation (CPM) is detailed. The L2-orthogonality of these codes is ensured by a bank of phase correction functions which maintains the phase continuity but also introduces frequency offsets. We prove that these codes achieve full diversity and have full rate. Moreover, these codes don't put any restriction on the CPM parameters<br>Les codes spatio-temporels orthogonaux par blocs (OSTBC) sont devenus populaires en ce qu'ils permettent de construire des systèmes de communications sans-fil à diversité maximale et à décodage simplifié par maximum de vraisemblance découplé. Cependant, ces codes reposent en général sur une orthogonalité ponctuelle, ce qui entraîne une dégradation bien connue du débit de transmission pour les systèmes à plus de deux antennes d'émission. Nous introduisons dans cette thèse le concept d'orthogonalité L2 pour les codes spatio-temporel (STC). Cette approche permet de généraliser naturellement la propriété d'orthogonalité ponctuelle pour des systèmes à codages spatio-temporels non-linéaires. Il devient alors possible de construire de nouveaux systèmes multi-antennes (MIMO) à faible complexité de décodage et gain de diversité maximal. De plus, contrairement aux systèmes reposant sur des codes linéaires orthogonaux, ces nouveaux systèmes ne présentent plus de limitation du débit de transmission pour plus de deux antennes. Nous détaillons la construction générale de diverses familles de codes spatio-temporels L2 à débit maximal reposant sur des modulations de phase continue (CPM) et ceci pour n'importe quel nombre d'antennes d'émission. L'orthogonalité L2 des systèmes construits est obtenue par un banc de fonctions de correction de phase qui induit la diversité par décalage en fréquence tout en maintenant la continuité de la phase pour chaque antenne. L'étude de ces codes permet de démontrer que les systèmes MIMO à décodage simplifié ainsi obtenus sont à diversité maximale et débit optimal. Enfin, notons que la construction de ces codes n'introduit aucune contrainte supplémentaire sur les paramètres des modulations de phase continue utilisées
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Levita, C. J. A. "Investigation of coded and uncoded CPM based wireless communication systems." Thesis, University of Huddersfield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323809.
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Ganesan, Aravind. "Capacity estimation and code design principles for continuous phase modulation (CPM)." [College Station, Tex. : Texas A&M University, 2003. http://hdl.handle.net/1969.1/53.
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Thesis (M.S.)--Texas A&M University, 2003.<br>"Major Subject: Electrical Engineering" Title from author supplied metadata (record created on Jul. 18, 2005.) Vita. Abstract. Includes bibliographical references.
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Xingwen, Ding, Chang Hongyu, and Chen Ming. "OPTIMUM PARAMETER COMBINATIONS FOR MULTI-H FULL RESPONSE CONTINUOUS PHASE MODULATION." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626964.
Full textAbstract:
According to IRIG 106-15, the ARTM CPM waveform, a kind of multi-h partial response continuous phase modulation (CPM), has almost three times the spectral efficiency of PCM/FM and approximately the same detection efficiency of PCM/FM. But the improved spectral efficiency of ARTM CPM comes at the price of computational complexity in the receiver. This paper focuses on multi-h full response CPM, which generally has less detection complexity than ARTM CPM, but also has good spectral efficiency and detection efficiency. Taking the minimum Euclidean distance, spectral efficiency and detection complexity as judgment criterions, optimum parameter combinations for multi-h full response CPM are presented.
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Xingwen, Ding, Zhong Yumin, Chang Hongyu, and Chen Ming. "Noncoherent Demodulation with Viterbi Decoding for Partial Response Continuous Phase Modulation." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579651.
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ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV<br>With the characteristics of constant envelope and continuous phase, Continuous Phase Modulation (CPM) signal has higher spectrum efficiency and power efficiency than other modulation forms. A noncoherent demodulation with Viterbi decoding for partial response CPM signals is proposed. Simulation results indicate that the demodulation performance of proper partial response CPM is better than the traditional PCM-FM, which is a typical modulation of full response CPM. And higher spectral efficiency is also obtained by partial response CPM.
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Carden, Frank, William Osborne, and Karim Alhussiny. "Simulation of Binary Continuous Phase Modulation Combined with (1,2)-Convolutional Encoder." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/611918.
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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California<br>In this paper the performance of a (1,2)-convolutional encoder combined with continuous phase modulation is simulated. A binary sequence is used inconjunction with the above encoder and a modulation index of (h=1/4). A full response 1REC frequency shaping function is used to maintain phase continuity. A binary (uncoded)CPM with the above modulation index is also simulated. The performance in terms of the probability of bit error event is plotted against signal to noise ratio for both coded and the uncoded CPM schemes. The asymptotic performance of both schemes is plotted along with MSK for comparison purposes. The simulation algorithm used in this paper utilizes the Block Oriented System Simulator known as BOSS. The major components of this simulation are the encoder and the decoder. The encoder consists of binary random data generator and a (1,2)-convolutional encoder combined with a channel vector encoder and a random white gaussian noise generator. The decoder consists of the following modules: sequential vector bank, inner product unit, metric calculator unit, multi stage trellis, symbol decoder and error counter module.
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Leatham, Robert L. "Space-Time Coding for the Advanced Range Telemetry Continuous Phase Modulation." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8413.
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Aeronautical telemetry systems that transmit the same signal through multiple antennas from the flight vehicle suffer from severe link dropouts when the signals destructively interfere one with another at receiver. The underlying issue is a transmit array with element spacing far greater than the wavelength producing a transmit antenna pattern with significant and deep nulls. Recently, space-time coding techniques have been proven to resolve the issue for systems using linear modulations and shaped-offset quadrature shift keying (SOQPSK) modulation, a non-linear continuous phase modulation (CPM). This thesis examines application of space-time coding techniques to resolve the self-interference issue for another CPM modulation, the advanced range telemetry (ARTM) CPM. It is shown in this thesis among the two branches of space-time coding, space-time block coding (STBC) and space-time trellis coding (STTC), only the latter offers a solution for a full rate, low complexity, no hardware modification implementation. Various candidate STTCs are identified via simulation using the pair-wise error probability as a performance metric. One STTC is identified with trivial implementation costs and an error performance that is a function of code length.
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Zhang, Xiaoxia. "On the design of multiple antenna systems with continuous phase modulation /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486402957194437.
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Golby, John N. A. "Investigation into PRS-precoded, constant-envelope, continuous-phase digital modulation schemes." Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/8345.
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Bibliography: leaves 78-79.<br>Partial response signaling ( PRS) has been used successfully to improve the spectral properties of Pulse Amplitude Modulated (PAM) digital transmission systems. This thesis investigation studied the effect of PRS on frequency- and phase-modulated carrier systems, in particular on their spectral performance and their maintenance of constant envelope.
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Kasan, Karim. "Performance of a new single sideband (SSB) continuous phase modulation (CPM)." Thesis, CentraleSupélec, 2021. http://www.theses.fr/2021CSUP0010.
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Dans cette thèse, nous étudions la modulation par déplacement de fréquence à bande latérale unique (SSB-FSK), un schéma de modulation de phase continue (CPM) ayant, par essence, la caractéristique original du spectre à bande latérale unique (BLU). Tout d’abord, nous présentons l’origine du signal à partir de la physique quantique. Ensuite, nous proposons un détecteur de séquence à maximum de vraisemblance (MLSD) simplifié pour les schémas CPM conventionnels, basé sur le réarrangement montré dans le modèle de signal SSB-FSK. Pour exploiter pleinement les performances de la SSB-FSK, nous examinons la probabilité d’erreur du signal, l’occupation de la bande passante et la complexité du récepteur. Étant donné que différentes mesures de performance sont prises en compte, nous avons utilisé une optimisation multi-objectifs pour obtenir de nouveaux schémas SSB-FSK plus performants que les schémas CPM classiques. En outre, nous proposons une solution pour simplifier la complexité des signaux SSB-FSK en utilisant la décomposition de la modulation d’amplitude d’impulsion (PAM). Les impulsions PAM ont été obtenues à partir d’un algorithme que nous avons développé. En outre, nous proposons une séquence d’entraînement générique optimale pour l’estimation conjointe de la synchronisation des symboles, du décalage de fréquence et de la phase de la porteuse pour la synchronisation en mode burst. La séquence d’entraînement a été obtenue en utilisant les bornes de Cramér-Rao<br>In this PhD thesis, we investigate the single-sideband frequency shift keying (SSB-FSK), a continuous phase modulation (CPM) scheme having, by essence, the original feature of the single-sideband (SSB) spectrum. First, we present the origin of the signal from quantum physics. Then, we propose a simplified Maximum likelihood sequence detection (MLSD) detector for conventional CPM schemes based on the rearrangement shown in the SSB-FSK signal model. To fully exploit the SSB-FSK performance, we examine the signal error probability, bandwidth occupancy, and receiver complexity. Since different performance metrics are considered, we employed a multi-objective optimization to achieve new SSB-FSK schemes that outperform conventional CPM schemes. Moreover, we propose a solution to simplify the complexity of SSB-FSK signals using the pulse amplitude modulation (PAM) decomposition. The PAM pulses were achieved from an algorithm we developed. Furthermore, we offer an optimum generic training sequence for the joint estimation of symbol timing, frequency offset, and carrier phase for burst mode synchronization. The training sequence was obtained using the Cramér-Rao bounds
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Geoghegan, Mark. "DESCRIPTION AND PERFORMANCE RESULTS FOR THE ADVANCED RANGE TELEMETRY (ARTM) TIER II WAVEFORM." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606485.
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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>The Advanced Range Telemetry (ARTM) program is a tri-service telemetry modernization project whose
goal is to assure that all Department of Defense (DoD) test and training ranges are able to use telemetry as
necessary to carry out their respective missions. Multi-h Continuous Phase Modulation (CPM) has been
selected by the ARTM JPO as the Tier II ARTM waveform, because it offers significant improvements over
both legacy telemetry waveforms (PCM/FM) and the newly-introduced Tier I waveform (Feher-patented
FQPSK) in terms of spectral containment and detection efficiency, while retaining a constant envelope
characteristic. The paper describes the theoretical and measured performance of the ARTM Tier II multi-h
CPM waveform, and the implementation of the trellis demodulator being developed for it.
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Malady, Amy Colleen. "Cyclostationarity Feature-Based Detection and Classification." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32280.
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Cyclostationarity feature-based (C-FB) detection and classification is a large field of research that has promising applications to intelligent receiver design. Cyclostationarity FB classification and detection algorithms have been applied to a breadth of wireless communication signals â analog and digital alike. This thesis reports on an investigation of existing methods of extracting cyclostationarity features and then presents a novel robust solution that reduces SNR requirements, removes the pre-processing task of estimating occupied signal bandwidth, and can achieve classification rates comparable to those achieved by the traditional method while based on only 1/10 of the observation time. Additionally, this thesis documents the development of a novel low order consideration of the cyclostationarity present in Continuous Phase Modulation (CPM) signals, which is more practical than using higher order cyclostationarity.
Results are presented â through MATLAB simulation â that demonstrate the improvements enjoyed by FB classifiers and detectors when using robust methods of estimating cyclostationarity. Additionally, a MATLAB simulation of a CPM C-FB detector confirms that low order C-FB detection of CPM signals is possible. Finally, suggestions for further research and contribution are made at the conclusion of the thesis.<br>Master of Science
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Patenaude, François. "Timing recovery for continuous phase modulation transmitted over fast flat-fading channels." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5617.
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The problem of deriving symbol synchronization information from the received signal for a class of bandwidth efficient continuous phase modulation (CPM) schemes transmitted over a fast flat-fading channel is studied. The modulation class considered is M-ary CPM with a modulation index h = 1/M. A particular synchronizer structure which generates a tone at the symbol rate in a manner which automatically cancels the fading phase effects is proposed and analyzed in detail. The practical aspects of implementing this synchronizer using digital signal processing methods are discussed. Finally, simulation results showing the root mean square jitter produced by this synchronizer for a few well-known cases of modulation and fading channel parameters are presented to illustrate the performances of the system.
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Yiin, Lihbor. "Sequence estimation receivers for trellis-coded continuous phase modulation on mobile channels." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14818.
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Hill, Terrance, and Mark Geoghegan. "A COMPARISON OF ADAPTIVELY EQUALIZED PCM/FM, SOQPSK, AND MULTI-H CPM IN A MULTIPATH CHANNEL." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/606358.
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International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California<br>It is widely recognized that telemetry channels, particularly airborne channels, are
afflicted by multipath propagation effects. It has also been shown that adaptive
equalization can be highly effective in mitigating these effects. However, numerous
other factors influence the behavior of adaptive equalization, and the type of modulation
employed is certainly one of these factors. This is particularly true on modulations which
exhibit different operating bandwidths. In this paper, we will examine the effect
multipath and adaptive equalization for three modulation techniques which are either
already in use, or have been proposed, for airborne telemetry.
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Chatzitheodoridi, Maria-Elisavet. "Processing Optimization for Continuous Phase Modulation-based Joint Radar-Communication System : Application on Imaging Radar." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST022.
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En raison de la croissance continue des applications électromagnétiques, le spectre devient de plus en plus encombré. Une solution possible à ce problème consiste à créer des systèmes radar-communication joints qui utilisent la même bande passante pour réaliser les deux applications. Dans cette thèse, nous nous intéressons à un système exploitant une forme d'onde issue du monde des communications pour réaliser conjointement de l'imagerie radar et un transfert d'information. Pour cela, parmi la multitude de codes existants, nous avons choisi d'utiliser des codes modulés continument en phase CPM, et plus particulièrement une sous-famille appelée Continuous Phase Frequency Shift-Keying codes. Les propriétés de ceux-ci, notamment en ce qui concerne l'occupation spectrale, sont d'abord étudiées et comparées à d'autres codes représentatifs des communications. Cependant, ces formes d'ondes présentent des qualités de compression dégradées par rapport au chirp habituellement utilisé en radar. En particulier les lobes secondaires résultant de la compression avec le filtre adapté sont plus élevés, nuisant à la qualité de l'image SAR résultante. Un filtre désadapté qui minimise l'énergie des lobes secondaires est proposé, ainsi qu'un algorithme rapide qui fournit les filtres pour tous les signaux émis en un temps de calcul raisonnable. Ce filtre désadapté est amélioré pour pouvoir traiter des valeurs inconnues de décalage Doppler ou de retard hors grille qui peuvent s'appliquer sur le signal reçu. De tels problèmes peuvent être généralisés à d'autres applications radar que le SAR. Une fois le choix de la méthode de compression d'impulsion établi, une évaluation des résultats est proposée. D'une part, des images SAR re-synthétisées sont générées, reconstruites à partir de données réelles basées sur le chirp, en utilisant des codes modulés continument et des filtres désadaptés, et différents outils de comparaison sont utilisés pour s'assurer de leurs performances. D'autre part, des données réelles sont acquises dans un cadre ISAR, afin de valider notre système dans un contexte réaliste. Finalement, nous pouvons apporter une réponse positive à la question suivante : pouvons-nous créer un système conjoint SAR-communication qui transmet des informations et fournit des images radar de haute qualité ?<br>Due to the continuous growth of electromagnetic applications, the spectrum gets more and more congested. A possible solution to this problem is the creation of joint radar-communication systems, because they can alleviate the spectrum occupancy by using the same bandwidth to perform both applications. In this thesis, a joint Synthetic Aperture Radar (SAR)-Communication system based on a communication waveform is considered. To do so, among all the existing codes, we chose Continuous Phase Modulated codes (CPM), and more specifically a sub-family called Phase Frequency Shift-Keying codes (CPFSK). Their properties, in particular the spectral occupation, are first studied and compared to other well-known communication codes. However, these waveforms present degraded compression qualities when compared to the usual chirp used for radars. More specifically, the sidelobes generated from the Matched Filter compression are higher, and thus deteriorate the resulting SAR image. The mismatched filter that minimizes the sidelobe level is proposed along with a fast algorithm that provides the filters for all the transmitted signals during an acceptable computational cost. This mismatched filter is further improved so that it can deal with unknown parameters. More precisely, if unknown Doppler shift or off-grid delay values are applied to the received signal, then an improved mismatched filter is provided. Such a problem can be extended to other radar applications. Once the range compression method choice is established, an evaluation of the results is proposed. On the one hand, re-synthesized SAR images are generated, reconstructed from real chirp-based data, using CPM codes and mismatched filters, and different comparison tools to ensure their performance.On the other hand, real data are acquired in an ISAR framework, in order to validate our system in a realistic context. Finally, we can provide a positive answer to the question: can we create a joint SAR-communication system that transmits information and provides an image of good radar quality?
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Temple, Kip. "ARTM TIER II WAVEFORM PERFORMANCE." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606713.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>One of the charters of the Advanced Range Telemetry (ARTM) program was to develop more spectrally efficient waveforms while trying to maintain similar performance to the legacy waveform, Pulse Code Modulation/Frequency Modulation (PCM/FM). The first step toward this goal was the ARTM Tier I family of waveforms which include Feher patented, quadrature phase shift keying, -B version (FQSPKB) and shaped offset quadrature phase shift keying, Telemetry Group version (SOQPSK-TG). The final step was development of Tier II, an even more spectrally efficient waveform, multi-h Continuous Phase Modulation (CPM). This paper characterizes the performance of this waveform when applied in an airborne telemetry environment and, where appropriate, comparisons are made with existing Tier 0 and Tier I waveforms. The benefits, drawbacks, and trade-offs when applying this waveform in an airborne environment will also be discussed.
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Chayot, Romain. "Synchronisation, détection et égalisation de modulation à phase continue dans des canaux sélectifs en temps et en fréquence." Thesis, Toulouse, INPT, 2019. http://oatao.univ-toulouse.fr/24188/1/Chayot_Romain.pdf.
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Si les drones militaires connaissent un développement important depuis une quinzaine d’année, suivi depuis quelques années par les drones civiles dont les usages ne font que se multiplier, en réalité les drones ont un siècle avec le premier vol d’un avion équipé d’un système de pilotage automatique sur une centaine de kilomètre en 1918. La question des règles d’usage des drones civiles sont en cours de développement malgré leur multiplication pour des usages allant de l’agriculture, à l’observation en passant par la livraison de colis. Ainsi, leur intégration dans l’espace aérien reste un enjeu important, ainsi que les standards de communication avec ces drones dans laquelle s’inscrit cette thèse. Cette thèse vise en effet à étudier et proposer des solutions pour les liens de communications des drones par satellite.L’intégration de ce lien de communication permet d’assurer la fiabilité des communications et particulièrement du lien de Commande et Contrôle partout dans le monde, en s’affranchissant des contraintes d’un réseau terrestre (comme les zones blanches). En raison de la rareté des ressources fréquentielles déjà allouées pour les futurs systèmes intégrant des drones, l’efficacité spectrale devient un paramètre important pour leur déploiement à grande échelle et le contexte spatiale demande l’utilisation d’un système de communication robuste aux non-linéarités. Les Modulations à Phase Continue permettent de répondre à ces problématiques. Cependant, ces dernières sont des modulations non-linéaire à mémoire entraînant une augmentation de la complexité des récepteurs. Du fait de la présence d’un canal multi-trajet (canal aéronautique par satellite), le principal objectif de cette thèse est de proposer des algorithmes d’égalisation (dans le domaine fréquentiel pour réduire leur complexité) et de synchronisation pour CPM adaptés à ce concept tout en essayant de proposer une complexité calculatoire raisonnable. Dans un premier temps, nous avons considéré uniquement des canaux sélectifs en fréquence et avons étudier les différents égaliseurs de la littérature. En étudiant leur similitudes et différences, nous avons pu développer un égaliseur dans le domaine fréquentiel qui proposant les mêmes performances a une complexité moindre. Nous proposons également des méthodes d’estimation canal et une méthode d’estimation conjointe du canal et de la fréquence porteuse. Dans un second temps nous avons montré comment étendre ces méthodes à des canaux sélectifs en temps et fréquence permettant ainsi de conserver une complexité calculatoire raisonnable.
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Qu, Zhen, and Ivan B. Djordjevic. "High-speed continuous-variable quantum key distribution over atmospheric turbulent channels." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626486.
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We experimentally demonstrate a RF-assisted four-state continuous-variable quantum key distribution (CV-QKD) system in the presence of turbulence. The atmospheric turbulence channel is emulated by two spatial light modulators (SLMs) on which two randomly generated azimuthal phase patterns are recorded yielding Andrews' azimuthal phase spectrum. Frequency and phase locking are not required in our system thanks to the proposed digital phase noise cancellation (PNC) stage. Besides, the transmittance fluctuation can be monitored accurately by the DC level in this PNC stage, which is free of post-processing noise. The mean excess noise is measured to be 0.014, and the maximum secret key rate of >20Mbit/s can be obtained with the transmittance of 0.85, while employing the commercial PIN photodetectors.
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Bomhara, Mohamed A. "Study of continuous-phase four-state modulation for cordless telecommunications : assessment by simulation of CP-QFSK as an alternative modulation scheme for TDMA digital cordless telecommunications systems operating in indoor applications." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/14805.
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One of the major driving elements behind the explosive boom in wireless revolution is the advances in the field of modulation which plays a fundamental role in any communication system, and especially in cellular radio systems. Hence, the elaborate choice of an efficient modulation scheme is of paramount importance in the design and employment of any communications system. Work presented in this thesis is an investigation (study) of the feasibility of whether multilevel FSK modulation scheme would provide a viable alternative modem that can be employed in TDMA cordless communications systems. In the thesis the design and performance analysis of a non-coherent multi-level modem that offers a great deal of bandwidth efficiency and hardware simplicity is studied in detail. Simulation results demonstrate that 2RC pre-modulation filter pulse shaping with a modulation index of 0.3, and pre-detection filter normalized equivalent noise bandwidth of 1.5 are optimum system parameter values. Results reported in chapter 5 signify that an adjacent channel rejection factor of around 40 dB has been achieved at channel spacing of 1.5 times the symbol rate while the DECT system standards stipulated a much lower rejection limit criterion (25-30dB), implying that CP-QFSK modulation out-performs the conventional GMSK as it causes significantly less ACI, thus it is more spectrally efficient in a multi-channel system. However, measured system performance in terms of BER indicates that this system does not coexist well with other interferers as at delay spreads between 100ns to 200ns, which are commonly encountered in such indoor environment, a severe degradation in system performance apparently caused by multi-path fading has been noticed, and there exists a noise floor of about 40 dB, i.e. high irreducible error rate of less than 5.10-3. Implementing MRC diversity combiner and BCH codec has brought in a good gain.
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Agirman, Handan. "Waveform Design For Pulse Doppler Radar." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606840/index.pdf.
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ABSTRACT
WAVEFORM DESIGN FOR PULSE DOPPLER RADAR
AgIRMAN, Handan
M.S., Department of Electrical and Electronics Engineering
Supervisor: Prof. Dr. Mete Severcan
December 2005, 100 pages
This study is committed to the investigation of optimum waveforms for a pulse doppler radar which uses a non linear high power amplifier in the transmitter. The optimum waveform is defined as the waveform with the lowest peak and integrated side lobe level, the narrowest main lobe in its autocorrelation and the narrowest bandwidth in its spectrum.
The Pulse Compression method is used in radar systems since it is more advantageous in terms of the resolution. Among all pulse compression methods, the main focus of this study is on Phase Coding. Two types of radar waveforms assessed throughout this study are Discrete Phase Modulated Waveforms and Continuous Phase Modulated Waveforms. The continuous phase modulated waveforms are arranged under two titles: the memoryless phase modulated waveform and the waveform modulated with memory.
In order to form memoryless continuous phase waveforms, initially, discrete phase codes are obtained by using Genetic Algorithm. Following this process, a new phase shaping pulse is defined and applied on the discrete phase waveforms.
Among the applicable modulation with memory techniques, Continuous Phase Modulation maintains to be the most appropriate. The genetic algorithm is used to find different lengths of optimum data sequences which form the continuous phase scheme.
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Culha, Onur. "Noncoherent Differential Demodulation Of Cpm Signals With Joint Frequency Offset And Symbol Timing Estimation." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613729/index.pdf.
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In this thesis, noncoherent differential demodulation of CPM signals with joint
carrier frequency offset and symbol timing estimation is investigated. CPM is very
attractive for wireless communications owing to major properties: good spectral
efficiency and a constant envelope property. In order to demodulate the received
CPM signal differentially, the symbol timing and the carrier frequency offset have
to be estimated accurately. There are numerous methods developed for the
purpose. However, we have not encountered studies (which are based on autocorrelation
estimation and hence suitable for blind synchronization) that give
expectable performance for both M-ary and partial response signaling. Thus, in
this thesis we analyze a feedforward blind estimation scheme, which recovers the
symbol timing and the frequency offset of M-ary CPM signals and partial response
CPM signals. In addition, we surveyed low complexity symbol detection methods
for CPM signals. Reduced state Viterbi differential detector incorporated to the
joint frequency offset and symbol timing estimator is also examined. The
performance of the examined demodulator scheme is assessed for the AWGN
channel by computer simulations.
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Ugurlu, Bilal. "Receiver Design For A Class Of New Pulse Shapes For Cpm Signals." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614093/index.pdf.
Full textAbstract:
Recently, a study on obtaining better Euclidean distance for CPM (Continuous Phase Modulation) signals that fit well-known GSM spectral envelope has been carried out, and significant performance improvements were obtained. Two new pulse shapes, which are represented using 8th degree polynomials, were optimized to give the best error performance under the constraint that the PSD stays below GSM spectral standards. However, the approach uses parameters that cause the number of states to increase considerably, and thus yielding high complexity for receiver implementation. In this thesis, a study on finding a feasible receiver design that can provide a performance with acceptable degradation but affordable complexity is carried out for those new pulse shapes. After a survey about complexity reduction techniques, a decision is made to go on with a receiver structure based on Laurent Decomposition (LD) of phase modulated signals. Unlike other complexity reduction techniques, usage of LD based receivers permits reduction in both the number of matched filters and trellis states. Throughout the study, different numbers of matched filters and trellis states were used in LD based receivers for the new pulse shapes, and good results are obtained. For the pulse shape with pulse length L = 3, about a gain of 0.93dB in power is achieved by only 2 matched filters and 14 trellis states. For the case where L = 7, approximately a gain of 2.25dB is achieved with only 8 matched filters and 56 states, whereas 896 matched filters and 448 states are needed in the optimum case without complexity reduction.
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Ko, Ching-Huai, and 柯景懷. "Punctured Continuous Phase Modulation Codes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60771663658330448211.
Full textAbstract:
碩士<br>國立高雄第一科技大學<br>電腦與通訊工程研究所<br>103<br>In the Convolutional Codes Coding Theory, in addition to a good minimal distance, a good convolutional code can reduce the state number of the best receivers and the metric number of the lapse of each decoding needed to be calculated. These are key conditions for evaluating the usefulness of a convolutional code. One of the most effective and industry-standard method is to use Punctured Convolutional Codes technology. The principle is to periodically cut off some of the transmitted bit so that the coding rate changes but the receiver is simplified. In the modulation theory, the continuous phase modulation(CPM) and the convolutional code are systems with trellis structure, so continuous phase modulation can be called continuous phase modulation codes. However, there is no similar contraction technology to CPM in the literature. The main reason is that if we cut off some of the transmit signal periodically, the CPM will not be a continuous phase modulation and the energy of transmission will be reduced. Recently CPM-TL is re-discussed while using CPM and find that it has good power and spectrum efficiency. However, to certain modulation factors, CPM-TL has power-wasted discrete line spectrum. The paper discusses about the feasibility of contraction technology in CPM-TL, and proposed two methods so that the shrinking CPM-TL remains continuous phase and the transmission energy is unchanged. More importantly, they solve the problem of wasted power in CPM-TL simultaneously.
First, we use PAM decomposition model to describe CPM-TL. CPM-TL can can be converted to a Mapper linked by a sum of different consecutive PAM pulse with different lengths. Each input of the pulse is a pseudo symbol generated by Mapper. The coding structure of CPM-TL exists in the Mapper . Therefore, we will cut off some of the symbols periodically which is produced by Mapper So that the number of PAM transmission is reduced. But the rest of the continuous PAM pulse still maintain the continuity of the transmission phase. To restore the lost energy, we propose two methods: Weighted Power Approach and Limiter Approach
We analyzed the state number after contraction, then use state computing spectral method to calculate the spectrum of continuous contraction phase modulation code. After that we use Viterbi Algorithm to find the minimum Euclidean distance of the new modulator and compare it with the previous CPM-TL. The results reveals that new and large coding gain CPM is found, and that weighted power approach and limiter approach have their own advantages in different bandwidth. Limiter approach will let discrete line spectrum grow back again, but its power is negligible.
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Dai, Chun-Lai, and 戴春來. "Spectrum Simulation of Continuous Phase Modulation Signals." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02974583205182626758.
Full textAbstract:
碩士<br>國立高雄第一科技大學<br>電腦與通訊工程所<br>97<br>In this thesis, the spectra of continuous phase modulated signals (CPM) are simulated. Since CPM signals have been extensively discussed in the field ofcommunications, due to CPM signals have properties of phase continuity, constant envelope, narrow frequency spectrum and a fast roll-off side-lobe. To keep phase continuity in the transmitted signals, CPM has memory inherently and the modulators are deployed with Viterbi algorithm to achieve coding gains. To compute the power spectra of general continuous phase modulation signals,many approaches have been proposed in the literature. The best known approaches are based either on the direct method of Anderson and Salz or on the autocorrelation method of Aulin and Sundberg [2]. In this thesis, we proposed an alternative power
spectral density formula [1] and compare to the results in [2]. It is concluded that this two approaches are essentially equivalent.
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Huang, Bor-Wei, and 黃柏維. "Hybrid Block Encoded with Continuous Phase Modulation." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/98029405468487906733.
Full textAbstract:
碩士<br>國立高雄第一科技大學<br>電腦與通訊工程所<br>91<br>Continuous phase modulation (CPM) is a modulation with memory. The memory results from the continuity of the transmitted carrier phase from one signal interval to the next. For specific forms of phase function and modulation indices, CPM can be represented with various type of modulations, namely, minimum shift keying (MSK), continuous phase frequency shift keying (CPFSK) and etc. Because of a single carrier whose phase is changed continuously, can avoid the use of signals having large spectral side lobes, CPM are thus attentive in mobile communications. When higher bandwidth and power efficiency is required, Trellis Coded Modulation (TCM) is applied to achieve improved power efficiency, with an increasing in the receiver complexity. However, Block Coded Modulation (BCM) has also been investigated that affords a better trade-off between power-efficiency and receiver complexity.
A block encoding approach is known to be one of the effective techniques to increase the minimum Euclidean distance of CPM signal. In contrast to using standard codes which increase the Hamming distance, codes are constructed to prevent merging events with low Euclidean distance from occurring. We extended previous words in block encoding CPM with a new approach, called hybrid block encoded CPM [22, 23]. Hybrid block encoded CPM applied two block encoder alternatively to CPM, and it is found that this new approach can achieve larger inevitable merging intervals and prevent merging events with low Euclidean distance, compared to the previous works. Larger inevitable merging event usually produce large Euclidean distance. The superiority of this new approach is verified by compute simulations.
Numerical results indicate that the minimum distance of CPM signal can be significantly increased by using hybrid block encoding, and it is shown that this new proposed approach outperforms conventional works for modulation index of interests (e.g., 0 < h < 0.4 and 0.6< h <1) in binary CPFSK and (e.g.,0 < h < 0.45 and 0.7< h <1) in CPM with RC pulse and consistently outperform previous work within 0 < h < 1 for coded quaternary CPFSK. Significant coding gains are obtained using this approach.
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Park, Cheol Hee. "Frequency domain processing techniques for continuous phase modulation." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2297.
Full textAbstract:
The continuous phase modulation (CPM) has a constant envelope and compact output power spectrum that makes it a promising underlying technology for power and spectrum efficient broadband wireless communications. However, high implementation complexity (especially the complexity of the receiver) required to deal with the phase memory and inter-symbol interference has impeded its adoption for broadband wireless communications, and only a few simple CPM modulation schemes have mainly been used, e.g. binary MSK and GMSK. Thus, research on efficient CPM transceivers to reduce the computational and hardware complexity is important. The major contribution of this dissertation is the development of novel frequency domain processing techniques and transceiver strategies to improve power and spectral efficiency, and reduce the complexity of CPM modulation schemes. First, this dissertation presents simplified frequency domain receiver structures and decoding schemes in the frequency domain for binary and M-ary CPM block transmission. The frequency domain receivers utilize parallel and serial structures with frequency domain processing which considerably reduces hardware and computational complexity compared to conventional time-domain processing. In addition, the decoding schemes in the frequency domain eliminate the controlled phase memory through frequency domain phase equalization instead of maximum-likelihood sequential decoders, e.g. Viterbi decoders. Second, frequency domain channel estimation schemes for CPM block transmission are presented, which adopt superimposed training signals to achieve bandwidth and power efficiency while reducing the complexity. In these schemes, the proposed frequency domain channel estimation uses the superimposed training signals as a reference signal to reduce the throughput loss caused by conventionally multiplexed training signals. Superimposed training signal design is presented, and the trade-off between bandwidth efficiency and power efficiency is also analyzed. Third, block transmission schemes and frequency domain equalization methods for CPM are proposed, which consider linear processing instead of conventional decomposition-based processing. The schemes of frequency domain linear processing avoid the complexity overhead (both in computation and hardware) of conventional orthogonal- or Laurent decomposed-based equalizers. Finally, this dissertation extends CPM block transmission and frequency domain equalization to phase-coded (time-varying modulation index) CPM, which shows better error performance and bandwidth efficiency than fixed modulation index CPM's.<br>text
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李運欽. "Maximum-likelihood receiver structure for continuous-phase modulation." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/62658540000388498443.
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