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1
Ma, Rui, Martin Kreißig, Florian Protze, et al. "Spin Toqure Oscillator Based BFSK Modulation." IEEE / Institute of Electrical and Electronics Engineers Incorporated, 2017. https://tud.qucosa.de/id/qucosa%3A35059.
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This work presents a spin torque nano-oscillator (STNO) based binary frequency shift keying (BFSK) modulation schema implemented on a printed circuit board (PCB). Maximal input data rate reaches 20 Mbit/s. Depending on the STNO used, carrier frequency can range from 1 to 10 GHz. Both DC and AC currents flowing through the STNO can be tuned between 0 to 4 mA. Using one magnetic tunnel junction (MTJ) STNO, a 380 MHz frequency shift around the center frequency 9 GHz was observed, when the modulated current was toggled between 0.8 mA and 1.2 mA at a rate of 20 Mbit/s. This is the first work demonstrating that the STNOs are applicable for BFSK modulation on the wireless application level.
2
Jung, Du San. "Detection of binary phase-shift keying signal in multipath propagation." Monterey, California: Naval Postgraduate School, 2002, 2002. http://hdl.handle.net/10945/9763.
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Time-varying dispersion and multipath propagation in a shallow underwater environment causes intersymbol interference in underwater communication. This thesis investigates a mitigation procedure for communication using a Binary Phase-Shift Keying (BPSK) signal. The method employed uses the time-reversed ocean impulse response to mitigate the degradation of the bit error rate performance. All results were achieved by the use of computer simulation of typical shallow water environments.
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Jung, Du San. "Detection of binary phase-shift keying signal in multioath propagation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FJung.pdf.
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Ghuman, Parminder, Salman Sheikh, Steve Koubek, Scott Hoy, and Andrew Gray. "High Rate Digital Demodulator ASIC." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/609676.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>The architecture of the High Rate (600 Mega-bits per second) Digital Demodulator (HRDD) ASIC capable of demodulating BPSK and QPSK modulated data is presented in this paper. The advantages of all-digital processing include increased flexibility and reliability with reduced reproduction costs. Conventional serial digital processing would require high processing rates necessitating a hardware implementation other than CMOS technology such as Gallium Arsenide (GaAs) which has high cost and power requirements. It is more desirable to use CMOS technology with its lower power requirements and higher gate density. However, digital demodulation of high data rates in CMOS requires parallel algorithms to process the sampled data at a rate lower than the data rate. The parallel processing algorithms described here were developed jointly by NASA’s Goddard Space Flight Center (GSFC) and the Jet Propulsion Laboratory (JPL). The resulting all-digital receiver has the capability to demodulate BPSK, QPSK, OQPSK, and DQPSK at data rates in excess of 300 Mega-bits per second (Mbps) per channel. This paper will provide an overview of the parallel architecture and features of the HRDR ASIC. In addition, this paper will provide an overview of the implementation of the hardware architectures used to create flexibility over conventional high rate analog or hybrid receivers. This flexibility includes a wide range of data rates, modulation schemes, and operating environments. In conclusion it will be shown how this high rate digital demodulator can be used with an off-the-shelf A/D and a flexible analog front end, both of which are numerically computer controlled, to produce a very flexible, low cost high rate digital receiver.
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Naab-Levy, Adam O. "Enhanced Distance Measuring Equipment Data Broadcast Design, Analysis, Implementation, and Flight-Test Validation." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1449158180.
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Dudak, Celal. "Effects Of Solid State Power Amplifier Nonlinearity On Various Phase Shift Keying Modulation Schemes." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605860/index.pdf.
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This study concentrates on the performance evaluation of a specific modulation scheme under nonlinear operation. This modulation scheme is the phase shift keying (PSK) modulation, exemplified by the special cases of BPSK, QPSK, OQPSK, &<br>#960<br>/4-QPSK. The specific nonlinear block is chosen to be the solid state power amplifier (SSPA) structure whose simulation model is the Rapp model. Varying transmitter filter characteristic and one of the power amplifier parameters constitute the main methodology of simulations. Bit error rate (BER), error vector magnitude (EVM), and Space Frequency Coordination Group (SFCG) spectral mask constraint are the evaluation parameters taken into account throughout this study. Simulation results support the initial literature survey, which reveals additional features showing how each modulation scheme is affected by various SSPA nonlinearity characteristics.
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Vacondio, Francesco. "On the benefits of phase shift keying to optical telecommunication systems." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27653/27653.pdf.
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Les avantages de la modulation de phase vis-à-vis la modulation d’intensité pour les
réseaux optiques sont claires et accepté par la communauté scientifique des télécommunications
optiques. Surtout, la modulation de phase montre une meilleure sensibilité
au bruit, ainsi qu’une plus grande tolérance aux effets non-linéaires que la modulation
d’intensité.
Nous présentons dans cette thése un étude qui vise à développer les avantages de la
modulation de phase. Nous attaquons d’abord la complexité du récepteur en détection
directe, en proposant une nouvelle configuration dont la complexité est comparable à
celle du récepteur pour la modulation d’intensité traditionnel, mais avec des meilleures
performances. Cette solution pourrait convenir pour les réseaux métropolitains (et
même d’accès) à haut débit binaire. Nous passons ensuite à l’examen de la possibilité
d’utiliser des amplificateur à semi-conducteur (SOA) au lieu des amplificateurs à fibre
dopée à l’erbium pour fournir amplification optique aux signaux modulés en phase.
Les non-linéarité des SOA sont étudiées, et un compensateur simple et très efficace est
proposé. Les avantages des amplificateurs à semi-conducteur par rapport à ceux à fibre
sont bien connus. Surtout, la méthode que nous proposons permettrait l’integrabilité
des SOA avec d’autres composants de réseau (par exemple, le récepteur nommé cidessus),
menant à des solutions technologiques de petite taille et efficaces d’un point de
vue énergétique.
Il y a deux types de systèmes pour signaux modulés en phase: basé sur la détection
directe, ou sur les récepteurs cohérents. Dans le dernière partie de ce travail, nous nous
concentrons sur cette dernière catégorie, et nous comparons deux solutions possibles
pour la mise à niveau des réseaux terrestres actuel. Nous comparons deux configurations
dont les performances sont très comparables en termes de sensibilité au bruit, mais nous montrons comment la meilleure tolérance aux effets non linéaires (en particuliers dans
les systèmes à débit mixte) fait que une solution soit bien plus efficace que l’autre.<br>The advantages of phase modulation (PM) vis-à-vis intensity modulation for optical
networks are accepted by the optical telecommunication community. PM exhibits a
higher noise sensitivity than intensity modulation, and it is more tolerant to the effects
of fiber nonlinearity. In this thesis we examine the challenges and the benefits of working
with different aspects of phase modulation.
Our first contribution tackles the complexity of the direct detection noncoherent
receiver for differentially encoded quadrature phase shift keying. We examine a novel
configuration whose complexity is comparable to that of traditional receivers for intensity
modulation, yet outperforming it. We show that under severe nonlinear impairments,
our proposed receiver works almost as well as the conventional receiver, with
the advantage of being much less complex. We also show that the proposed receiver is
tolerant to chromatic dispersion, and to detuning of the carrier frequency. This solution
might be suitable for high-bit rates metro (and even access) networks.
Our second contribution deals with the challenges of using semiconductor optical
amplifiers (SOAs) instead of typical erbium doped fiber amplifiers (EDFAs) to provide
amplification to phase modulated signals. SOAs nonlinearities are investigated, and we
propose a simple and very effective feed-forward compensator. Above all, the method
we propose would permit the integrability of SOAs with other network components (for
example, the aforementioned receiver) achieving small size, power efficient sub-systems.
Phase modulation paves the way to high spectral efficiency, especially when paired
with digital coherent receivers. With the digital coherent receiver, the degree of freedom
offered by polarization can be exploited to increase the channel bit rate without
increasing its spectral occupancy. In the last part of this work we focus on polarization
multiplexed signaling paired with coherent reception and digital signal processing. Our third contribution provides insight on the strategies for upgrading current terrestrial
core networks to high bit rates. This is a particularly challenging scenario, as
phase modulation has to coexist with previously installed intensity modulated channels.
We compare two configurations which have received much attention in the literature.
These solutions show comparable performance in terms of back-to-back noise sensitivity,
and yet are not equivalent. We show how the superior tolerance to nonlinear fiber
propagation (and particularly to cross phase modulation induced by the presence of
intensity modulated channels) makes one of them much more effective than the other.
8
Kocakanat, Murat. "A direct sequence - code division multiple access/binary phase shift keying (DS-CDMA/BPSK) modem design." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8270.
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Chagnon, Mathieu. "Digital signal processing assessment for optical coherent receiver using dual-polarization Quadrature phase shift keying modulation." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97202.
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In this work, we evaluate different approaches of digital signal processing applied after a coherent receiver in order to recover the binary information of an optical signal modulated in Dual-Polarization Quadrature Phase Shift Keying. We explain in details the functioning of a coherent receiver as well as the optical and electrical signals travelling inside. We present the criteria of the two lasers employed for modulation and demodulation, i.e., the signal and local oscillator lasers, as a function of the modulation format and the binary rate. We expose all the required signal processing for information recovery out of a coherent receiver and mention those who will be assessed in this work, along with the reason of their selection. Subsequently, the metric to assess the different methods is introduced. The latter is twofold and consists of the computational complexity and the final bit error rate that each approach yields. The schematics of the test bed follows in parallel with the parameter space of our setup. The computational complexity and the bit error rate of ten different approaches are presented, and an optimal configuration of methods and parameters to use for such modulation and receiver is deduced.<br>Dans ce travail, nous évaluons différentes approches de traitement de signaux numériques pour un récepteur cohérent optique dans le but de recouvrir l'information binaire d'un signal modulé sur double polarization et quatre niveaux de phase, ou « Dual-Polarization QPSK ». Nous expliquons en détail le fonctionnement d'un récepteur cohérent ainsi que les signaux optiques et électriques qui s'y propagent. Nous présentons les critères des deux lasers utilisés pour la modulation et la démodulation cohérente, i.e., les lasers signal et oscillateur local, en fonction du format de modulation utilisé et du taux binaire. Nous exposons tous les traitements de signaux numériques requis pour recouvrir l'information sortant d'un récepteur cohérent et mentionnons ceux qui seront évalués dans ce travail ainsi que les raisons de leur sélection. Par la suite, nous introduisons la métrique d'évaluation des différentes approches. Cette dernière comporte deux facettes, soit la complexité de calcul des différents algorithmes et paramètres utilisés ainsi que le taux d'erreur binaire final que l'ensemble des processus produisent lorsqu'une certaine approche est employée. La présentation schématique du banc de test suit de concert avec l'espace des paramètres du montage. La complexité de calcul et le taux d'erreur binaire de dix différentes approches sont présentés et une configuration optimale des paramètres et méthodes pour un tel format de modulation et receveur est déduite.
10
Monica, G. Della, and E. Tonello. "NEW GENERATION COMMAND RECEIVER FOR SATELLITE USING BENEFITS OF DIGITAL PROCESSING." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607344.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>Presentation of Alcatel Espace last studies and developments regarding TT&C receiver
Products for satellite. This document lays on 3 parts:
· a technical point of view showing digital demodulation principles used (base band
recovery, analytical head, PM or FM demodulation) and their related offered
possibilities(digital controlling loop, lock status detection, jammer detection,....)
· a technology/design description
· a synthesis showing performance and results
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Jefferis, Robert P. "EVALUATION OF CONSTANT ENVELOPE OFFSET QUADRATURE PHASE SHIFT KEYING TRANSMITTERS WITH A SOFTWARE BASED SIGNAL ANALYZER." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605762.
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International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>Off-line software based signal analysis can be a valuable tool for detailed examination of transmitter signal characteristics. This paper describes the Advanced Range Telemetry (ARTM) Constant Envelope (CE) offset quadrature phase shift keying (OQPSK) modulation analyzer. It was developed expressly for evaluation of FQPSK-B^(1), FQPSK-JR and shaped OQPSK transmitter signals. Rationale for its creation, underlying assumptions, computation methods, and examples of its data products are presented.
12
Berhanu, Samuel, and Kamal Neupane. "Digital Radio Implementation for NASA S-Band Space Network Transceiver." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581843.
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The system diagrams for the digital radio compatible with NASA's S-Band Space Network operating from 2025.8 - 2117.9 MHz (forward link) to 2200 - 2300 MHz (return link) are presented. The digital radio implementation includes binary phase shift keying (BPSK), quadrature phase shift keying (QPSK) and staggered quadrature phase shift keying (SQPSK). We have derived the system requirements for these modulation schemes from the Space Network User Guide (SNUG) and thereafter, derived system diagrams for the communication links. The designed system diagrams for the transceiver were implemented using Simulink models and USRP2 platform.
13
Quinteros, Milton I. "Trellis Coded Modulation Schemes Using A New Expanded 16-Dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying Constellation." ScholarWorks@UNO, 2009. http://scholarworks.uno.edu/td/924.
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In this thesis, the author presents and analyzes two 4-dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying constellations. Optimal demodulators for the two constellations are presented, and one of them was designed and implemented by the author. In addition, a novel expanded 16-dimensional CEQ2PSK constellation that doubles the number of points without decreasing the distance between points or increasing the peak energy is generated by concatenating the aforementioned constellations with a particular method and restrictions. This original 16-dimensional set of symbols is set-partitioned and used in a multidimensional Trellis-Coded Modulation scheme along with a convolutional encoder of rate 2/3. Effective gain of 2.67 dB over uncoded CEQ2PSK constellation with low complexity is achieved theoretically. A coding gain of 2.4 dB with 8 dB SNR is obtained by using Monte Carlo simulations. The TCM systems and demodulators were tested under an Additive White Gaussian Noise channel by using Matlab's Simulink block diagrams.
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Lee, Tong-Fu, Shih-Ho Wang, Chia-Liang Liu, and Liu Bao. "FQPSK-L: An Improved Constant Envelope Modulation Scheme for QPSK." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/609210.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>A new constant envelope modulation scheme and architecture for QPSK by cubic spline interpolation methods which increase spectral efficiency and power efficiency, named FQPSK-L, is presented. This modulation technique is an extension of the Feher Quadrature Shift Keying (FQPSK) patented technologies, see Ref [1]. Being a constant envelope modulation, FQPSK-L can operate with class C power amplifier without spectrum regrowth. We achieve a more compact spectrum with comparable bit error rate performance. For example, FQPSK-L is about 20% more spectral efficient than GMSK BTb=0.3 from 40 to 70 dB attenuation point. Moreover, FQPSK-L intrinsically has spikes at fc ± 0.5fb, fc ± 1.0fb, fc ± 1.5fb, ... which are useful for carrier recovery, symbol time recovery and fading compensation. In Rayleigh fading channel, FQPSK-L outperform GMSK BTb=0.3 by 0.8 dB. FQPSK-L is an excellent scheme for wireless and satellite communications which require high spectral and power efficiency.
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Martin, Warren L. "FQPSK DEVELOPMENTS RECOMMENDED FOR CCSDS STANDARDIZATION BY NASA JPL." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/607720.
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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>In 1992, international space agencies became concerned that increasing frequency band congestion, together with attempts by the mobile telephone industry to obtain additional bandwidth, would result in substantially more interference incidents. The CCSDS undertook a technical study to identify and recommend more bandwidth efficient modulation schemes, which would permit more users to co-exist in a frequency band while reducing interference incidents. This paper describes the contribution of the Jet Propulsion Laboratory (JPL) to that effort.
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Lee, Tong-Fu, Shih-Ho Wang, and Chia-Liang Liu. "FQPSK-O: An Improved Performance Constant Envelope Modulation Scheme for OQPSK." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607387.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>A new constant envelope modulation scheme for OQPSK, called FQPSK-O, is
presented. This modulation technique is an extension of the Feher Quadrature Shift
Keying (FQPSK) patented technologies, see Ref[l]. This scheme uses cubic spline
interpolation to generate very smooth baseband waveforms in order to increase the
spectral and power efficiency. Being a constant envelope modulation, FQPSK-O can
operate with class C power amplifier without spectrum regrowth. We achieve a more
compact spectrum with comparable bit error rate performance. For example, the spectrum
of FQPSK-O is 25% narrower than that of GMSK with BT(b)=0.3 and FQPSK-1 with
hardlimiter [2] at -40 dB attenuation point. For coherent demodulation under AWGN
channel, FQPSK-O has almost the same BER performance as FQPSK-1 with hardlimiter.
Both of them are better than GMSK with BT(b)=0.3 for BER < 10^-4. In Rayleigh fading
channel, FQPSK-O outperforms GMSK with BT(b)=0.3 by 2 dB. FQPSK-O is an excellent
scheme for wireless and satellite communications which require high spectral and power
efficiency.
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Spáčil, Jan. "Komunikační systémy s digitálními modulacemi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217453.
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The purpose of this semestral project is to explain the basic issues of simple digital modulations through the creation of simple digital modulations using direct digital synthesis. It begins with a short review of digital modulation theory and the theory about direct digital synthesis. All the technical documentation is attached, including schematics and boards of functional modulator.
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Gray, Andrew, Meera Srinivasan, Marvin Simon, and Tsun-Yee Yan. "FLEXIBLE ALL-DIGITAL RECEIVER FOR BANDWIDTH EFFICIENT MODULATIONS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608745.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>An all-digital high data rate parallel receiver architecture developed jointly by Goddard Space Flight Center and the Jet Propulsion Laboratory is pre- sented. This receiver utilizes only a small number of high speed components along with a majority of lower speed components operating in a parallel fre- quency domain structure implementable in CMOS, and can process over 600 Mbps with numerous varieties of QPSK modulation, including those incorpo- rating precise pulse shaping for bandwidth eÆcient modulation. Performance results for this receiver for bandwidth eÆcient QPSK modulation schemes such as square-root raised cosine pulse shaped QPSK and Feher’s patented QPSK are presented, demonstrating the great degree of exibility and high performance of the receiver architecture.
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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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Feher, Kamilo. "SPECTRAL EFFICIENCY OF COMMERCIAL WIRELESS AND TELEMETRY SYSTEMS IS DOUBLED WITH IRIG 106-00 STANDARDIZED FQPSK AND IS QUADRUPLED WITH FQAM." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606757.
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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Advances in spectrally efficient Feher’s Quadrature Phase Shift Keying (FQPSK) and Feher‘s
Quadrature Amplitude Modulation (FQAM) patented technologies, commercial and government
“dual-use” FQPSK products and Test & Evaluation (T&E) results are highlighted in this overview
paper. US and international customer requirements/systems, programs and recent deployments and
standardization programs are also described. FQPSK doubles the spectral efficiency of PCM/FM
Telemetry and of Feher patented Gaussian Minimum Shift Keying (GMSK or FGMSK) and of
alternatives, while FQAM quadruples the spectral efficiency of these systems. The predominant focus
of this presentation is on an overview and advances of IRIG 106-00 standardized FQPSK technologies.
FQAM systems will also be described. Use of FQPSK for applications such as telemetry, data links,
clear mode, TDMA ,CSMA and CDMA, OCDMA, WCDMA as well as OFDM – COFDM will be
included in the presentation.
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Horcher, Gregg. "DESIGN CONSIDERATIONS FOR DEVELOPMENT OF AN AIRBORNE FQPSK TRANSMITTER." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607301.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper describes the design considerations used by Aydin Telemetry in the
development of its high data rate Feher Patented Quadrature Phase Shift Keying
(FQPSK) [1] frequency agile transmitter. We will address several key areas of interest to
the Telemetry community, such as the use of commercially available VLSI parts to
minimize parts count while maximizing reliability, adaptive filtering to accommodate a
wide range of data rates, and user selectable features to achieve a universal transmitter
design. User selectable features include differential encoder, 15 stage IRIG randomizer,
and 1/2 rate convolutional FEC coding. This paper also addresses the spectral efficiency
that can be achieved using a Class-C amplifier with FQPSK and the measured bit error
rate (BER) performance versus Eb/No.
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Law, Eugene, and Kamilo Feher. "FQPSK VERSUS PCM/FM FOR AERONAUTICAL TELEMETRY APPLICATIONS; SPECTRAL OCCUPANCY AND BIT ERROR PROBABILITY COMPARISONS." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609732.
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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The aeronautical telemetry community is investigating alternative modulation methods to the commonly used non-return-to-zero (NRZ) pulse code modulation (PCM)/frequency modulation (FM). This paper outlines the important characteristics being investigated. Measured data comparing the spectral occupancy and bit error probability (BEP) performance of PCM/FM with that of a prototype constant envelope Feher’s quadrature phase shift keying (FQPSK) modulator and demodulator will also be presented. Measured results in several radio frequency bands demonstrate that the 99.99% and -60 dBc bandwidths of filtered FQPSK are only approximately one-half of the corresponding bandwidths of optimized PCM/FM even when the signal is non-linearly amplified. The signal energy per bit to noise power spectral density (E /N ) required for a BEP of 1×10 b 0 -5 for non-optimized FQPSK was approximately 12 dB which is approximately the same as limiter discriminator detected PCM/FM.
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Du, Preez Johannes. "An investigation into OFDM as a suitable modulation tecnique for an acoustic underwater modem." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71806.
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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: This thesis investigates orthogonal frequency division multiplexing (OFDM) as a viable modulation technique for an ultrasonic acoustic underwater modem. The underwater environment provides a challenging setting for acoustic communications. Long delay spreads due to multipath propagation, severe Doppler frequency shifts, frequency dependent absorption and very limited bandwidth are but some of the challenges to overcome. OFDM essentially provides the parallel transmission of symbols in the frequency domain by simultaneously modulating many closely spaced orthogonal subcarriers. The resulting long parallel symbol rate together with the cyclic extension of symbols render the signal robust against intersymbol interference (ISI) caused by multipath propagation. Intercarrier interference (ICI) between the overlapping frequency responses of subcarriers is mitigated by their property of orthogonality. Doppler spread contributes to the loss of orthogonality and can result in severe ICI. A method of measuring the Doppler shift by means of including a preamble and postamble symbol with each data frame is proposed. The detected frequency offset is corrected by resampling the frame at the desired sample rate. Not only do the ambles serve as a mechanism for timing and frequency synchronisation, but they are also applied in the channel estimation process. The equalisation of channel response is required for the coherent demodulation of the received symbols. An investigation into different phase shift keying (PSK) and quadrature amplitude modulation (QAM) constellations reveal optimal arrangements for minimal symbol errors. The optimised QAM constellations do not lend themselves to Gray-coding, so that an efficient interleaving scheme is needed to mitigate the non-uniform distribution of bit errors among symbol errors. Forward error correction is provided via a Bose Chaudhuri Hocquenghem (BCH) block code. Variable code rates, together with the ability to switch between different constellations, enable the modem to perform so-called variable modulation in an attempt to maximise the throughput under specific channel conditions. The modulation/demodulation scheme is wholly defined in software as to provide flexibility and facilitate experimentation with different signal processing methods. The accompanying hardware platform allows for the transmission of a pre-generated signal and the recording of a received signal for off-line processing. The prototype design serves as a proof of concept and thus provides only simplex communication. Field tests over limited distances demonstrate the successful operation of the prototype modem. We conclude that OFDM is indeed a suitable modulation technique for acoustic underwater communication.<br>AFRIKAANSE OPSOMMING: Hierdie tesis ondersoek die toepassing van ortogonale frekwensiedeling multipleksering (OFDM) as modulasie tegniek op ʼn onderwater kommunikasie modem. Die onderwater omgewing bied vele uitdagings vir akoestiese kommunikasie. Lang vertraging-verstrooiings as gevolg van multipad voortplanting, Doppler frekwensieskuif, frekwensieafhanklike absorpsie, en beperkte bandwydte is van die uitdagings wat oorkom moet word. In essensie bied OFDM die parallelle versending van ʼn aantal simbole deur die gelyktydige modulasie van verskeie nou-gespasieerde subdraers in die frekwensiegebied. Die gevolglike lang parallelle simboolperiodes, tesame met die sikliese uitbreiding van simbole, verleen immuniteit teen intersimbool steurnisse (ISI) wat ontstaan as gevolg van multipad voortplanting. Die ortogonaliteit van naburige draers in die frekwensiegebied beperk interdraer steuring (ICI) tussen hul oorvleuelende frekwensie weergawes. Doppler frekwensieskuif kan egter lei tot die verlies aan ortogonaliteit en bydra tot ernstige interdraer steurings. ʼn Metode wat gebruik maak van aanhef en slot simbole, ingesluit by elke raam, word voorgestel om die Dopplerskuif te meet. Die bepaalde frekwensieafset word gekorrigeer deur die monstertempo van die raam aan te pas na die verlangde tempo. Buiten die tyd- en frekwensie-sinkronisasie funksies van die aanhef en slot simbole, speel dit ook ʼn belangrike rol in die ontrekking van die frekwensie weergawe van die kanaal. Die effening van die kanaal se frekwensieweergawe is noodsaaklik vir die koherente demodulasie van die ontvangde simbole. ʼn Ondersoek na verskillende fase verskuif sleuteling (PSK) en kwadratuur amplitude modulasie (QAM) konstellasies het optimale rangskikkings opgelewer vir minimale simboolfoute. Hierdie optimale QAM konstellasies verleen hulself egter nie na Gray-kodering nie. ʼn Effektiewe invlegtegniek is nodig om die nie-uniforme verspreiding van bisfoute tussen simboolfoute te beperk. Fout korrigering funksionaliteit word gebied deur ʼn Bose Chaudhuri Hocquenghem (BCH) blokkode. Verstelbare koderingstempo’s en die vermoë om tussen verskillende konstellasies te skakel, stel die modem in staat om sogenaamde verstelbare modulasie te gebruik in ʼn poging om die data deurset te optimeer onder spesifieke kanaal kondisies. Die modulasie en demodulasie skema is volledig in sagteware gedefinieer. Dit verleen buigbaarheid en vergemaklik eksperimentering met verskeie seinverwerkingstegnieke. Die meegaande hardeware platvorm stel die modem in staat om vooraf opgewekte seine uit te saai en rou ontvangde siene op te neem vir na-tydse verwerking. Die prototipe ontwerp dien as ʼn konseptuele bewys en bied dus slegs simplekse kommunikasie. Die suksesvolle werking van die modem is gedemonstreer deur toetsing oor beperkte afstande. Hieruit word afgelei dat OFDM inderdaad geskik is vir akoestiese onderwater kommunikasie.
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Mannah, Marc-Anthony. "Transmission de données par courants porteurs en ligne sur un réseau modulé en largeur d'impulsion." Nantes, 2010. http://www.theses.fr/2010NANT2034.
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Ce travail de thèse traite de l’application de la technologie des Courants Porteurs en Ligne (CPL) au sein d’une association convertisseur machine à des fins de commande et de monitoring. La technologie des CPL est très répandue dans les réseaux domestiques sinusoïdaux. Elle permet la transmission de données numériques par les câbles dédiés au transport de l’énergie électrique de l’habitat. Dans une application convertisseur machine, le réseau électrique est un réseau Modulé en Largeur d’Impulsions (MLI). Une étude approfondie du signal MLI et des essais, menés avec des coupleurs CPL domestiques sur un réseau MLI, permettent de mettre en relief les limitations de cette technologie. Suite à cette étude, des coupleurs adaptés aux exigences du réseau MLI et fonctionnant dans la bande de fréquence 55 MHz – 85 MHz sont développés. Les débits nécessaires dans une application commande de machine font l’objet de discussions. Une modulation mono porteuse QPSK est retenue. Les essais expérimentaux sont réalisés sur une plateforme composée d’un ensemble convertisseur machine et assurant un transfert de données à 1,6 Mbit/s. Ces essais montrent la faisabilité de la communication par CPL dans un réseau MLI<br>This thesis studies the use of the Power Line Communication PLC technology in a motor inverter association for purposes of controlling and monitoring. This technology is widely used in domestic applications and allows a reliable communication through the sinusoidal electrical network. In a motor drive application, the electrical network is a Pulse Width Modulation network and consequently this technology may not work. Following a thorough study of the PWM signal, a series of experimental measurements using the domestic PLC modems over the PWM network were carried out and have underlined the inefficiency of the sinusoidal PLC technology. Based on the obtained results and on the PWM network requirements, we have developed industrial PLC couplers. The good functioning of these couplers has been validated in the frequency band 55 MHz – 85 MHz. A study of the required throughput in motor drive applications led us to define the QPSK modulation for data transmission. The modem was developed and communication was tested under different conditions with a throughput equal to 1. 6 Mbits/s. The different experimental measurements have demonstrated the PLC communication feasibility over the PWM network
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Richter, Thomas [Verfasser], Klaus [Akademischer Betreuer] Petermann, Peter A. [Gutachter] Andrekson, and Ronald E. [Gutachter] Freund. "Parametric amplifiers and their system applications in optical fiber communications with phase-shift keying and quadrature-amplitude modulation / Thomas Richter ; Gutachter: Peter A. Andrekson, Ronald E. Freund ; Betreuer: Klaus Petermann." Berlin : Technische Universität Berlin, 2016. http://d-nb.info/1156182328/34.
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Ramantanis, Petros. "Contribution to the analysis of optical transmission systems using QPSK modulation." Phd thesis, Institut National des Télécommunications, 2011. http://tel.archives-ouvertes.fr/tel-00765380.
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The constant demand for capacity increase, together with the foreseen saturation of the single-mode optical fiber, paved the way to technological breakthroughs that have completely changed the landscape of fiber-optic telecommunications. The most important advance was, undeniably, the practical implementation of a coherent detection with the help of high-speed electronics. This has, first, enabled the use of advanced modulation formats that allowed for a more efficient use of the fiber bandwidth, compared to the classical On-Off Keying, while adapted algorithms could not be used in order to mitigate the optical signal degradation. This thesis began a little after the advent of coherent detection and its main objective was to revisit the propagation effects in optical transmission systems using "Quadrature phase shift keying" (QPSK) modulation in the context of terrestrial systems, i.e. for transmission distances of up to about 2000 km. The manuscript is divided into two parts. The first part is dedicated to a study on the data sequences that need to be used in numerical simulations, when advanced modulation is involved. Fiber propagation, and in particular the interplay between chromatic dispersion and nonlinearities, usually introduce a nonlinear inter-symbol interference (ISI) to the transmitted signal. Since this ISI depends on the actual transmitted data pattern, it is obvious that the choice of the sequence used in our numerical simulations will have a direct influence on the estimated channel quality. Since, an infinite length, random sequence is impractical; we very commonly use pseudorandom" (PR) sequences, i.e. finite-length, deterministic sequences with balanced pattern statistics that seem to be random. In the first part we describe the method of generating M-level (with M>2) pseudorandom sequences and we detail their properties. In addition, we propose numerical tools to characterize the non-pseudorandom sequences that we use in numerical simulations, or we are sometimes forced to use in laboratory experiments. Finally, we present results of numerical simulations that quantify the necessity to use PR sequences as a function of our system parameters. After having established the "fairest possible" finite sequences, in the second part of the manuscript, we focus on the study of the nonlinear propagation, in the context of a transmission system using QPSK modulation and assuming a variable dispersion management and fiber type. Specifically, we numerically study the signal statistics due to the interplay of chromatic dispersion and nonlinear effects, neglecting all polarization or multi-wavelength effects and the amplifier noise. In this context, we were first interested in determining whether some empirical laws developed for OOK systems, can be also used in the case of QPSK modulation, such as the criterion of cumulative nonlinear phase (ΦNL) or laws that allow for a quick optimization of the dispersion management. Next we reveal the importance of a global phase rotation added to the initial signal constellation, as a parameter that can provide interesting information for the post-optimization of our system. We also discuss the fact that the constellation shape critically depends on the applied dispersion management, while there are generally 3 types of constellations, concerning the complex signal statistics: (1) the phase variance is higher than the amplitude variance (2) the amplitude variance is higher than the phase variance and (3) the received signal constellation resembles to a constellation of a signal under the influence of just an Additive White Gaussian Noise. Finally, we provide a phenomenological explanation of the constellations shapes revealing the fact that different data sub-sequences suffer from a different kind of signal degradation, while we also use this information to define a parameter that quantifies the potential benefit from a MAP (Maximum A Posteriori probability) correction algorithm
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Lin, Jinsong, and Kamilo Feher. "BANDWIDTH EFFICIENCY AND BER PERFORMANCE OF ENHANCED AND FEC CODED FQPSK." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/607727.
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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Bit error rate (BER) and bandwidth efficiency of several variations of enhanced Feher patented quadrature phase shift keying (FQPSK) [1] are described. An enhanced FQPSK increases the channel packing density of that of the IRIG 106-00 standardized FQPSK-B by approximately 50% in adjacent channel interference (ACI) environment. As the bandwidth efficiency of FQPSK-B DOUBLES (2×) that of pulse code modulation/Frequency modulation (PCM/FM) [5], the enhanced FQPSK, with a simpler transceiver than FQPSK-B, has a channel packing density of TRIPLE (3×) that of PCM/FM. One of the other enhanced FQPSK prototypes has an end to end system loss of only 0.4 dB at BER=1x10^(-3) and 0.5 dB at BER=1x10^(-4) from ideal linearly amplified QPSK theory. The enhanced FQPSK has a simple architecture, thus is inexpensive and has small size, for ultra high bit rate implementation. With low redundancy forward error correction (FEC) coding which expands the spectrum by approximately 10%, further improvement of about 3-4.5dB E N b o is attained with NLA FQPSK-B and enhanced FQPSK at BER=1x10^(-5) .
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Agnolini, Sébastien. "Contributions à l'étude et à la réalisation d'un système de distribution quantique de clef par codage en phase." Paris 6, 2007. https://pastel.archives-ouvertes.fr/pastel-00003416.
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Cette thèse propose une étude et une réalisation expérimentale d’un système de distribution quantique de clef utilisant le protocole BB84 par codage en phase sur un photon unique, aux longueurs d’onde des télécommunications optiques ( = 1,5µm). La génération des photons uniques est assurée par un laser de type ILM dont les impulsions optiques sont fortement atténuées afin qu’elles ne contiennent pas plus d’un photon (en moyenne 0,1 photon par bit). La modulation QPSK satisfaisant à des choix de base et de symbole indépendants est assurée par l’utilisation de modulateurs Mach-Zehnder à doubles électrodes. Différentes méthodes de détection cohérente (hétérodyne, homodyne, super-homodyne) sont proposées et comparées. Les évolutions successives de notre système nous amènent à proposer aujourd’hui un système de cryptographie quantique à une voie optique utilisant un codage DQPSK (Differential Quadrature Phase Shift Keying).
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Ramantanis, Petros. "Contribution to the analysis of optical transmission systems using QPSK modulation." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2011. http://www.theses.fr/2011TELE0020.
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La demande constante de capacité et la saturation prévue de la fibre monomode ont conduit récemment à des avances technologiques qui ont complètement changé le paysage des télécommunications à fibre optique. Le progrès le plus important était la mise en œuvre d'une détection cohérente à l'aide d'électronique rapide. Cela a permis pas seulement l'utilisation de formats de modulation qui promettent une utilisation plus efficace de la bande passante, mais aussi l’utilisation des algorithmes adaptés pour combattre la dégradation du signal optique due à la propagation. Cette thèse a commencé un peu après le début de cette « ère du cohérent » et son principal objectif était de revoir les effets physiques de la propagation dans des systèmes de transmission terrestres, utilisant le format de modulation QPSK (Quadrature Phase Shift Keying). Le manuscrit est divisé en deux parties. La première partie est consacrée à une étude sur les séquences des données qui doivent être utilisés dans les simulations numériques, lorsqu’un format de modulation avancée est impliqué. La propagation, et en particulier l'interaction entre la dispersion chromatique et les non-linéarités, introduisent une interférence inter-symbole (ISI). Vu que cet ISI dépend de l’enchainement des données transmises, il est évident que le choix de la séquence a une influence sur la qualité estimée du canal. Etant donné que des séquences aléatoires infinies ne sont pas pratiquement réalisables, nous utilisons souvent des séquences « pseudo-aléatoires » (PR), i.e. des séquences déterministes de longueur finie, avec des statistiques équilibrés, qui semblent être aléatoires. Dans la première partie, nous décrivons la méthode de génération de séquences PR avec M. niveaux (M> 2) et nous détaillons leurs propriétés. En outre, nous proposons des outils numériques pour caractériser les séquences non pseudo-aléatoires qu’on utilise souvent dans des simulations, ou parfois aussi dans des expériences au laboratoire. Enfin, nous présentons les résultats de simulations qui permettent de quantifier la nécessité d'utiliser des séquences PR en fonction des paramètres du système. Après avoir établi les séquences finies "les plus adaptées", dans la seconde partie du manuscrit, nous nous concentrons sur l'étude de la propagation, dans le contexte d'un système de transmission QPSK et en supposant une gestion de dispersion et un type de fibre variables. Plus précisément, nous étudions numériquement les statistiques de signaux dégradés dus à l'interaction de la dispersion chromatique avec les effets non linéaires, en négligeant tout effet de polarisation ou inter-canaux, aussi que le bruit des amplificateurs. Dans ce contexte, nous étions intéressés à déterminer si certaines lois empiriques développées pour les systèmes OOK, sont valable dans le cas d'une modulation QPSK, tels que le critère de la phase non-linéaire cumulée (ΦNL) ou des lois qui permettent une optimisation de la gestion de dispersion. Ensuite, nous révélons l'importance de la rotation de la constellation du signal initial, comme un paramètre qui peut fournir des informations pour la post-optimisation de notre système. Nous discutons également autour du fait que la forme de la constellation dépend de la gestion de dispersion et concernant les constellations nous concluons qu'il y en a généralement 3 types, avec: (1) une variance de phase supérieure à la variance d'amplitude (2) une variance d'amplitude supérieure à la variance de phase et (3) avec le signal ayant une constellation qui ressemble à la constellation d’un signal sous l'influence d'un bruit blanc gaussien additif. Enfin, nous fournissons une explication phénoménologique des formes des constellations révélant le fait que des sous-séquences différentes conduisent à un « type » différent de dégradation et nous utilisons ces informations pour définir un paramètre qui quantifie le bénéfice potentiel d'un algorithme de correction du type MAP(Maximum A Posteriori Probability)<br>The constant demand for capacity increase, together with the foreseen saturation of the single-mode optical fiber, paved the way to technological breakthroughs that have completely changed the landscape of fiber-optic telecommunications. The most important advance was, undeniably, the practical implementation of a coherent detection with the help of high-speed electronics. This has, first, enabled the use of advanced modulation formats that allowed for a more efficient use of the fiber bandwidth, compared to the classical On-Off Keying, while adapted algorithms could not be used in order to mitigate the optical signal degradation. This thesis began a little after the advent of coherent detection and its main objective was to revisit the propagation effects in optical transmission systems using "Quadrature phase shift keying" (QPSK) modulation in the context of terrestrial systems, i.e. for transmission distances of up to about 2000 km. The manuscript is divided into two parts. The first part is dedicated to a study on the data sequences that need to be used in numerical simulations, when advanced modulation is involved. Fiber propagation, and in particular the interplay between chromatic dispersion and nonlinearities, usually introduce a nonlinear inter-symbol interference (ISI) to the transmitted signal. Since this ISI depends on the actual transmitted data pattern, it is obvious that the choice of the sequence used in our numerical simulations will have a direct influence on the estimated channel quality. Since, an infinite length, random sequence is impractical; we very commonly use pseudorandom" (PR) sequences, i.e. finite-length, deterministic sequences with balanced pattern statistics that seem to be random. In the first part we describe the method of generating M-level (with M>2) pseudorandom sequences and we detail their properties. In addition, we propose numerical tools to characterize the non-pseudorandom sequences that we use in numerical simulations, or we are sometimes forced to use in laboratory experiments. Finally, we present results of numerical simulations that quantify the necessity to use PR sequences as a function of our system parameters. After having established the “fairest possible” finite sequences, in the second part of the manuscript, we focus on the study of the nonlinear propagation, in the context of a transmission system using QPSK modulation and assuming a variable dispersion management and fiber type. Specifically, we numerically study the signal statistics due to the interplay of chromatic dispersion and nonlinear effects, neglecting all polarization or multi-wavelength effects and the amplifier noise. In this context, we were first interested in determining whether some empirical laws developed for OOK systems, can be also used in the case of QPSK modulation, such as the criterion of cumulative nonlinear phase (ΦNL) or laws that allow for a quick optimization of the dispersion management. Next we reveal the importance of a global phase rotation added to the initial signal constellation, as a parameter that can provide interesting information for the post-optimization of our system. We also discuss the fact that the constellation shape critically depends on the applied dispersion management, while there are generally 3 types of constellations, concerning the complex signal statistics: (1) the phase variance is higher than the amplitude variance (2) the amplitude variance is higher than the phase variance and (3) the received signal constellation resembles to a constellation of a signal under the influence of just an Additive White Gaussian Noise. Finally, we provide a phenomenological explanation of the constellations shapes revealing the fact that different data sub-sequences suffer from a different kind of signal degradation, while we also use this information to define a parameter that quantifies the potential benefit from a MAP (Maximum A Posteriori probability) correction algorithm
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Jacobsson, Fredrik. "DPSK modulation format for optical communication using FBG demodulator." Thesis, Linköping University, Department of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2307.
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<p>The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a Mach-Zehnder interferometer receiver with an optical filter (Fiber Bragg Grating). Computer simulations were made with single optical transmission, multi channel systems and transmission with combined angle/intensity modulated optical signals. The simulations showed good results at both 10 and 40 Gbit/s. Laboratory experiments were made at 10 Gbit/s to verify the simulation results. It was found that the demodulation technique worked, but not with satisfactory experimental results. The work was performed at Eindhoven University of Technology, Holland, within the framework of the STOLAS project at the department of Electro-optical communication.</p>
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Lee, Ping-Hwan, and 李秉寰. "Unitary Space-Time Modulation using Amplitude Phase-Shift Keying." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/fg527u.
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碩士<br>國立中央大學<br>通訊工程研究所<br>96<br>A systematic design of unitary space-time modulation using phase shift-keying (PSK) signals was proposed in 2000. In this thesis, we propose three schemes of unitary space-time modulation (USTM) that use amplitude phase-shift keying (APSK) signal points. We utilize the computer to search codes in USTM that maximize the diversity product ζ. Several of searched codes in Scheme 1 and Scheme 3 have better diversity product ζ than the codes for the proposed scheme in 2000. Simulation results confirm that our searched codes have better error performances than the proposed scheme in 2000.
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Ojha, Anuj Raj. "Trellis coding on multi-amplitude continuous phase frequency shift keying /." 2007. http://proquest.umi.com/pqdweb?did=1453189151&sid=12&Fmt=2&clientId=10361&RQT=309&VName=PQD.
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Hsu, Ching-Chia, and 許晉嘉. "Performance of Code-Phase Shift Keying Modulation on Code Division Multiple Access Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/81466300742438370628.
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碩士<br>國立清華大學<br>通訊工程研究所<br>90<br>Code-phase shift keying modulation is a new technology presented recently. It derives from the conventional DSSS system and is modified by employing distinct symbols with distinct code phases of a single periodic m-sequence. According to the length of period and sampling interval of the m-sequence, CPSK can be separated into two kinds: short code sequences and long code sequences. The advantages of using M-ary CPSK is to advance the power efficiency compared to conventional BPSK and advance the bandwidth efficiency by increasing . It also raises the system flexibility by using long code sequences. We will show the analysis about system performance and illustrate the implementation of two methods.
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Cheng, Hsuan-Chi, and 鄭軒麒. "Performance Evaluation for Spreading-Code-Phase-Shift-Keying Modulation in MC-CDMA Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/91901996851502507796.
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王俐嵐. "A Low-Power Binary Phase Shift Keying Demodulator for Power and Data Telemetry Systems in Biomedical Implants." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/88505520286880999692.
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碩士<br>國立交通大學<br>電信工程研究所<br>101<br>This paper presents a fully digital binary-phase-shift keying (BPSK) demodulator for data and power telemetry. This demodulator recovers BPSK signals by detecting the symbol edge of the digitized received carrier. Parameters of the coupling coils, rectifier DC output, and data rate are taken into consideration in the early design stage. The demodulator achieves a data rate of 13.56Mb/s at a carrier frequency of 13.56MHz, achieving 100% data rate to carrier frequency ratio. Given a limited coil size and quality factor, the maximum data rate of this system achieves 678kb/s with BER < 10-9. Fabricated in a 0.18μm CMOS process, the chip area is 0.445mm2. The chip core dissipates 191μW at 13.56MHz. A system prototype was developed to transmit data and power simultaneously through a pair of coils.
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"A remodulation scheme for wavelength-division multiplexing passive optical network using time-interleaved differential phase shift keying modulation format." 2011. http://library.cuhk.edu.hk/record=b5894827.
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Li, Pulan.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (p. 60-66).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Overview of wavelength division multiplexed passive optical network (WDM-PON) and colorless optical network unit (ONU) --- p.1<br>Chapter 1.2 --- Implementation of colorless ONU --- p.4<br>Chapter 1.3 --- Rayleigh backscattering in WDM-PON --- p.6<br>Chapter 1.4 --- Motivation of this thesis --- p.9<br>Chapter 1.5 --- Outline of this thesis --- p.11<br>Chapter Chapter 2 --- Previous works of remodulation for WDM-PON --- p.12<br>Chapter 2.1 --- Introduction --- p.12<br>Chapter 2.2 --- Devices utilized by colorless ONU in remodulation schemes --- p.13<br>Chapter 2.2.1 --- Injection-locked Fabry-Perot laser diode at ONU --- p.13<br>Chapter 2.2.2 --- Reflective semiconductor optical amplifier --- p.15<br>Chapter 2.2.3 --- Reflective electro-absorption modulator and semiconductor optical amplifier (REAM-SOA) --- p.17<br>Chapter 2.3 --- Modulation methods in remodulation schemes --- p.18<br>Chapter 2.4 --- Summary --- p.23<br>Chapter Chapter 3 --- A remodulation scheme based on time-interleaved DPSK modulation format --- p.25<br>Chapter 3.1 --- Introduction --- p.25<br>Chapter 3.2 --- Operation principle: time-interleaving technology for phase-modulated signal --- p.27<br>Chapter 3.3 --- System architecture --- p.28<br>Chapter 3.4 --- Experimental results and discussion --- p.31<br>Chapter 3.5 --- Effect of timing misalignment on proposed remodulation scheme --- p.33<br>Chapter 3.6 --- Summary --- p.35<br>Chapter Chapter 4 --- Enhanced Tolerance to Rayleigh Backscattering in Remodulation Scheme Using Time-Interleaved DPSK Format --- p.37<br>Chapter 4.1 --- Introduction --- p.37<br>Chapter 4.2 --- Studies on Rayleigh backscattering suppression in optical domain --- p.39<br>Chapter 4.2.1 --- RB suppression in carrier-distributed schemes --- p.39<br>Chapter 4.2.2 --- RB suppression in remodulation schemes --- p.40<br>Chapter 4.2 --- Experimental setup and results --- p.42<br>Chapter 4.3 --- Discussion on RB suppression effect of the proposed scheme --- p.46<br>Chapter 4.3.1 --- Theoretical study and simulation results --- p.46<br>Chapter 4.3.2 --- Experimental demonstration of spectral relationship between signals and RB crosstalk --- p.49<br>Chapter 4.4 --- Summary --- p.53<br>Chapter Chapter 5 --- Conclusion and Future Works --- p.55<br>Chapter 5.1 --- Conclusion of this thesis --- p.55<br>Chapter 5.2 --- Future works --- p.57<br>List of Publications --- p.59<br>Bibliography --- p.60
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Lin, Jin-Cheng, and 林晉丞. "Performance of Binary Phase Shift Keying with Dithering and Design of Hardware-Simple Digital Low-Pass Filters with Sharp Transition Bands." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/yc5m5f.
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碩士<br>國立彰化師範大學<br>電信工程研究所<br>105<br>The first topic, we discuss whether the dithering technique is effective in binary phase shift keying modulation. In order to achieve dithering, the dithering signal must be independent of the input signal. In this paper, the binary phase shift keying is used to add the artificial analog noise signal to binary phase shift keying (BPSK) modulation, the quantization of the noise is reduced as much as possible by quantification of the analog-to-digital converter (ADC), and the signal after sampling is converted to spectrum by Fourier transform. We compare the bit error rate (BER) with different quantization bits and add the dither signal, and improve the spur on the spectrum.
The second topic, we propose a new method to design a cascade digital low-pass filter (LPF) and implement the design with the software, it is interesting that we use the hardware-simple complementary comb filter as an shaping filter and reshape the frequency response of the prototype filter. Using a second order infinite impulse response (IIR) filter cascade with one or two complementary comb filters, the filter after the cascade has a very sharp transition band and a very flat passband, this composite filter inherits other features of the infinite impulse response filter, which includes a very deep cut-off band. The new filter in this paper as long as the user according to our design of the human–machine interaction steps to enter the required parameters of the value, you can output several groups of filters to meet the constraints to facilitate the follow-up hardware to achieve, this design allows users to have more The flexibility to design a high efficiency filter system with low system complexity.
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Van, Wyk Daniel Jacobus. "Four-dimensional Q2PSK modulation and coding for mobile digital communication." Diss., 1996. http://hdl.handle.net/2263/29078.
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Please read the abstract in the section 00front of this document.<br>Dissertation (MEng (Electronic Engineering))--University of Pretoria, 2006.<br>Electrical, Electronic and Computer Engineering<br>unrestricted
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Yogesh, S. "Power Line For Data Communication : Characterisation And Simulation." Thesis, 1995. https://etd.iisc.ac.in/handle/2005/2188.
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Yogesh, S. "Power Line For Data Communication : Characterisation And Simulation." Thesis, 1995. http://etd.iisc.ernet.in/handle/2005/2188.
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Cheng, Cheng-Hsiang, and 鄭丞翔. "The Design of CMOS 13.56-MHz Power and Data Telemetry System with a new Low-Power Binary Phase Shift Keying Demodulator for Biomedical Implants." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/959xj4.
Full textAbstract:
碩士<br>國立交通大學<br>電子工程學系 電子研究所<br>102<br>For cochlear application, the biomedical device should be fully implantable. The currently battery technology still cannot stand for an enough time for medical devices operation (about 1 year), the patient needs a wireless power transfer implant medical device, meanwhile, data transmission is required for stimulator circuits. The currently technology is using dual band transmission, one for power transfer and the other for data telemetry, which causes additional area. To solve this problem, a near-field inductive power and data transmission to provide power supply and data for implantable biomedical devices is adopted. In this thesis, we have developed and fabricated a binary phase shift keying (BPSK) demodulator, using phase lock loop (PLL) to detect the change of frequency and capture the data edge to demodulate the incoming data and clock. For the complete design, the 20-mA output current CMOS active voltage doubler rectifier and LDOs are integrated in the single chip. The hand winding near-field coil with ferrite core is fabricated, that can successfully transmit power and data at resonant frequency 13.56MHz. The measured power for demodulator is 221μW at data rate is 200Kbps and the measured ripple of rectifier, analog LDO and digital LDO are 10.4mV, 5.9mV, 72.4mV. The 76.5% high power efficiency is achieved.
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Yogesh, Prasad K. R. "Generation of Modulated Microwave Signals using Optical Techniques for Onboard Spacecraft Applications." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/2849.
Full textAbstract:
This thesis deals with optical synthesis of unmodulated and modulated microwave signals. Generation of microwave signals based on optical heterodyning is discussed in detail.
The effect of phase noise of laser on heterodyned output has been studied for different phase noise profiles. Towards this, we propose a generic algorithm to numerically model the linewidth broadening of a laser due to phase noise. Generation of microwave signals is demonstrated practically by conducting an optical heterodyning experiment. Signals ranging in frequency from 12.5 MHz to 27 GHz have been generated.
Limitations of optical heterodyning based approach in terms of phase noise performance and frequency stability are discussed and practically demonstrated. A hardware-efficient Optical Phase Locked Loop (OPLL) is proposed to overcome these issues. Phase noise tracking performance of the proposed OPLL has been experimentally demonstrated. Phase noise values as low as -105 dBc/Hz at 10 KHz offset have been achieved.
Optical modulators, owing to their extremely low electro-optic response time, can support high frequency modulating signals. This makes them highly attractive in comparison to their microwave counterparts. In this thesis, we propose techniques to generate microwave signals modulated at very high bit rates by down-converting the corresponding modulated optical signals to microwave domain. Down-conversion required for this process is achieved by optical heterodyning. The proposed concept has been theoretically analyzed, simulated and experimentally validated. Amplitude Modulated and ASK modulated microwave signals have been generated as Proof-of-Concept.
Limitations posed by OPLL in generation of angle modulated microwave signals by optical heterodyning have been brought out. Schemes overcoming these limitations have been proposed towards generation of BPSK and QPSK modulated microwave signals.
Integrated Optics (IO) technology has been studied as a means of implementation of the proposed concepts. IO components like Sinusoidal bends, Y-branch splitters and Electro-Optic-Modulators (EOMs) have been designed towards optical synthesis of modulated microwave signals. Propagation of modulated optical signal through these IO components has also been studied.
An all-optic scheme based on Optical Beam Forming is proposed for transmission of QPSK modulated signal. Limitation of phase-shifting based approach, in terms of beam-squint, has been brought out. True-Time-Delay based approach has been proposed for applications demanding wide instantaneous bandwidth to avoid beam-squint.
Algorithms / numerical methods required for analyses and simulations associated with the above-mentioned tasks have been evolved.
This study is envisaged to provide useful insight into the realization of high-speed, compact, light-weight data transmitting systems based on Integrated Optics for future onboard spacecraft applications. This work, we believe, is a step towards realization of an Integrated Optic System-on-Chip solution for specific microwave data transmission applications.
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Yogesh, Prasad K. R. "Generation of Modulated Microwave Signals using Optical Techniques for Onboard Spacecraft Applications." Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2849.
Full textAbstract:
This thesis deals with optical synthesis of unmodulated and modulated microwave signals. Generation of microwave signals based on optical heterodyning is discussed in detail.
The effect of phase noise of laser on heterodyned output has been studied for different phase noise profiles. Towards this, we propose a generic algorithm to numerically model the linewidth broadening of a laser due to phase noise. Generation of microwave signals is demonstrated practically by conducting an optical heterodyning experiment. Signals ranging in frequency from 12.5 MHz to 27 GHz have been generated.
Limitations of optical heterodyning based approach in terms of phase noise performance and frequency stability are discussed and practically demonstrated. A hardware-efficient Optical Phase Locked Loop (OPLL) is proposed to overcome these issues. Phase noise tracking performance of the proposed OPLL has been experimentally demonstrated. Phase noise values as low as -105 dBc/Hz at 10 KHz offset have been achieved.
Optical modulators, owing to their extremely low electro-optic response time, can support high frequency modulating signals. This makes them highly attractive in comparison to their microwave counterparts. In this thesis, we propose techniques to generate microwave signals modulated at very high bit rates by down-converting the corresponding modulated optical signals to microwave domain. Down-conversion required for this process is achieved by optical heterodyning. The proposed concept has been theoretically analyzed, simulated and experimentally validated. Amplitude Modulated and ASK modulated microwave signals have been generated as Proof-of-Concept.
Limitations posed by OPLL in generation of angle modulated microwave signals by optical heterodyning have been brought out. Schemes overcoming these limitations have been proposed towards generation of BPSK and QPSK modulated microwave signals.
Integrated Optics (IO) technology has been studied as a means of implementation of the proposed concepts. IO components like Sinusoidal bends, Y-branch splitters and Electro-Optic-Modulators (EOMs) have been designed towards optical synthesis of modulated microwave signals. Propagation of modulated optical signal through these IO components has also been studied.
An all-optic scheme based on Optical Beam Forming is proposed for transmission of QPSK modulated signal. Limitation of phase-shifting based approach, in terms of beam-squint, has been brought out. True-Time-Delay based approach has been proposed for applications demanding wide instantaneous bandwidth to avoid beam-squint.
Algorithms / numerical methods required for analyses and simulations associated with the above-mentioned tasks have been evolved.
This study is envisaged to provide useful insight into the realization of high-speed, compact, light-weight data transmitting systems based on Integrated Optics for future onboard spacecraft applications. This work, we believe, is a step towards realization of an Integrated Optic System-on-Chip solution for specific microwave data transmission applications.
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Παπαμιχαήλ, Μιχαήλ. "Σχεδίαση και ανάπτυξη ολοκληρωμένων κυκλωμάτων για συστήματα υπερευρείας ζώνης με έμφαση στα κυκλώματα του πομπού". Thesis, 2011. http://hdl.handle.net/10889/5245.
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Η πληθώρα των εφαρμογών που μπορεί να εξυπηρετήσει η τεχνολογία Υπερευρείας Ζώνης (UWB), από τα ασύρματα προσωπικά δίκτυα υψηλών ταχυτήτων, μέχρι τα ασύρματα δίκτυα αισθητήρων με δυνατότητες ακριβούς εντοπισμού θέσης, και τα ασύρματα δίκτυα ιατρικών αισθητήρων, έχει προκαλέσει έντονο ερευνητικό ενδιαφέρον γύρω από τις υλοποιήσεις UWB συστημάτων. Η ασυνήθιστα μεγάλη περιοχή συχνοτήτων που έχει ανατεθεί στο UWB, από τα 3.1-10.6 GHz, επιτρέπει την επίτευξη υψηλών ταχυτήτων με απλά σχήματα διαμόρφωσης, ωστόσο, λόγω της διαμοίρασης του φάσματος με τις υφιστάμενες τεχνολογίες ασύρματης δικτύωσης, οι UWB εκπομπές πρέπει να περιορίζονται σε ισχύ κάτω από το κατώφλι των -41.3 dBm/MHz, ικανοποιώντας πολύ αυστηρές μάσκες εκπομπής που εισάγουν έντονες προκλήσεις στη σχεδίαση των πομπών.
Η υλοποίηση αναδιατάξιμων UWB πομπών σε σύγχρονες CMOS τεχνολογίες, με υψηλή φασματική ευελιξία, ταχύτητα και ποιότητα διαμόρφωσης, καθώς και με χαμηλή κατανάλωση, αποτέλεσε το αντικείμενο της συγκεκριμένης διατριβής. Υιοθετώντας την αρχιτεκτονική Multi-Band Impulse-Radio (MB-IR) σε συνδυασμό με την τεχνική Direct Sequence BPSK, η έρευνα προσανατολίστηκε προς την ανάπτυξη καινοτόμων μονάδων βασικής ζώνης, με στόχο την ενεργειακά αποδοτική αντιστροφή Γκαουσιανών μορφοποιημένων παλμών υψηλής ποιότητας φάσματος και διάρκειας μικρότερης ακόμα και από 1 nsec.
Προς αυτή την κατεύθυνση, αναπτύχθηκε μια καινοτόμα γεννήτρια Γκαουσιανών παλμών με πολύ χαμηλούς πλευρικούς λοβούς στο φάσμα, τυπικά κάτω από -40 dB, ώστε να υποστηρίζονται οι αυστηρότερες μάσκες εκπομπής ή και μελλοντικές. Η σχεδίασης της προτεινόμενης γεννήτριας είχε ως κριτήριο την ευέλικτη ρύθμιση της διάρκειας των παραγόμενων παλμών, και αξιοποίησε τη χαρακτηριστική μεταφοράς τάσης ενός ωμικά φορτωμένου, ασύμμετρου CMOS αντιστροφέα. Η γεννήτρια βασίζεται κυρίως σε ψηφιακά κυκλώματα πολύ χαμηλής τάσης και, σε σύγκριση με τις υφιστάμενες υλοποιήσεις, παρουσιάζει σημαντικό προβάδισμα στον τομέα της ταχύτητας, καθώς και στο πλάτος εξόδου, η μεγάλη τιμή του οποίου χαλαρώνει σημαντικά τη σχεδίαση του RF front end. Η γεννήτρια μελετήθηκε διεξοδικά, διεξήχθη ανάλυση κλιμάκωσης, έγινε εξαγωγή σχεδιαστικών εξισώσεων και αναπτύχθηκαν εργαλεία λογισμικού για την αυτοματοποιημένη σχεδίασή της. Για περαιτέρω αύξηση της ταχύτητας των παλμικών σημάτων εφαρμόσθηκε ειδική σχεδίαση, η οποία αντιπραγματεύεται την ταχύτητα με το επίπεδο των λοβών του φάσματος.
Για την αποδοτική BSPK διαμόρφωση των Γκαουσιανών παλμών αναπτύχθηκε ειδική τοπολογία “Μεταγωγής Σήματος Πυροδότησης Πλήρους Ισορροπίας με Up-Conversion”. Η τοπολογία αυτή, σε αντίθεση με τις ανταγωνιστικές τοπολογίες, αποφεύγει την αντιστροφή του παλμού με αναλογικά κυκλώματα υψηλής κατανάλωσης, αλλά και την αναλογική μεταγωγή, καθώς η διαμόρφωση λαμβάνει χώρα πριν από την παραγωγή των παλμών. Παράλληλα, επιτυγχάνονται υψηλοί ρυθμοί, καθώς και υψηλή ποιότητα διαμόρφωσης λόγω των ισορροπημένων μονοπατιών της τοπολογίας. Η γεννήτρια μαζί με το διαμορφωτή αποτελούν τις καινοτόμες παρεμβάσεις στη μονάδα Βασικής Ζώνης του προτεινόμενου πομπού.
Για την ολοκλήρωση της λειτουργικότητας του πομπού, αναπτύχθηκε ένα RF front end, το οποίο αποτελείται από έναν διπλά ισορροπημένο μίκτη, έναν LO buffer, ένα μετατροπέα διαφορικού σήματος σε απλό, και έναν ενισχυτή ισχύος, ο οποίος είναι προσαρμοσμένος στα 50 Ohms, χωρίς να απαιτεί κανένα εξωτερικό στοιχείο. Το RF front end ολοκληρώθηκε μαζί με τη μονάδα βασικής ζώνης, και ο ολοκληρωμένος πομπός κατασκευάστηκε σε τεχνολογία CMOS 130 nm. Το ολοκληρωμένο προσαρτήθηκε στην RF πλακέτα συστήματος με την τεχνική Chip on Board. Για την επιτυχία του συστήματος με την πρώτη προσπάθεια έγινε συσχεδίαση σε επίπεδο IC-Package-PCB, δίνοντας ιδιαίτερη έμφαση στα ζητήματα Signal/Power Integrity.
Ο πομπός παρουσίασε την υψηλότερη ταχύτητα από τις ανταγωνιστικές MB-IR UWB υλοποιήσεις, ίση με 1.5 Gbps, με αντίστοιχη ενεργειακή αποδοτικότητα 21 pJoule/bit και μέτρο διανυσματικού σφάλματος 5.5%. Ο πομπός βελτίωσε τους πλευρικούς λοβούς στο φάσμα περισσότερο από 10 dB, ενώ η διατριβή, εκμεταλλευόμενη την αναδιαταξιμότητα του πομπού, παρουσιάζει, επιπλέον, τις πρώτες μετρήσεις σε ταχύτητες εκατοντάδων Mbps για ικανοποίηση της χαμηλής ζώνης της πρόσφατα θεσμοθετημένης, και εξαιρετικά αυστηρής, ευρωπαϊκής μάσκας εκπομπής.<br>The multitude of applications that Ultra-Wideband (UWB) technology can serve, from high-speed Wireless Personal Area Networks, to Wireless Sensor Networks with precision Geolocation abilities, and Wireless Medical Networks, has attracted intense research interest in the implementation of UWB systems. The unusually wide range of frequencies assigned to UWB, from 3.1-10.6 GHz, allows UWB systems employing low order modulation schemes to enjoy high throughput at low power consumption. However, since UWB shares the spectrum with existing wireless networking technologies, UWB emissions must be limited to a power spectral density below the threshold of -41.3 dBm/MHz, satisfying very stringent emission masks and introducing great challenges in the design of UWB transmitters.
The subject of this thesis is the design of low power, fully integrated, reconfigurable CMOS UWB transmitters, with high spectral flexibility, high speed and high modulation quality. Adopting the Multi-Band Impulse-Radio architecture, in conjunction with the Direct Sequence BPSK modulation, the research focused on the development of a baseband unit, able to precisely invert Gaussian shaped, subnanosecond pulses. The key contributions of this thesis are a CMOS Gaussian Pulse Generator and a BSPK modulation topology, which jointly constitute the proposed baseband unit.
The Pulse Generator (PG) is based on non-linear shaping, so as to facilitate the configurability of the output pulse duration, and exploits the voltage transfer characteristic of a Resistive Loaded Asymmetrical CMOS Inverter, which results in spectral sidelobes typically better than -40 dB. The PG incorporates mostly-digital low voltage circuits, while the MOSFET devices that undertake the pulse shaping avoid exclusive operation in weak inversion, in contrast to previous implementations. Consequently, the proposed CMOS PG is able to support higher throughput, as well as higher output amplitude, which relaxes considerably the design of the RF front end. This thesis presents a systematic design procedure and a scaling analysis of the non-linear pulse shaper. Moreover, in order to further increase the speed, a special PRF boost technique is proposed, which trades off speed and spectral efficiency for the spectral sidelobes level.
Regarding the BPSK modulator, this work introduces the “Trigger Switching Fully Balanced Up-Conversion” topology, which avoids the use of power-hungry and distortion-prone analog circuits for the accurate inversion of the subnanosecond shaped pulses, as well as avoids the application of analog waveform switching to the baseband pulses, since the baseband modulation takes place before the generation of the pulses. The digital nature of the switching lends itself to high data rates, while the balanced paths of the topology ensure high modulation quality with minimal design effort. Wafer probing measurements confirmed the high performance of the baseband unit.
The functionality of the transmitter was completed by the development of an RF front end which consists of a double balanced mixer, an LO buffer, a differential to single-ended (DtoSE) converter, and a power amplifier which is ready to drive a 50 Ohms load without requiring any off-chip components. The integrated transmitter, which incorporates the proposed baseband unit and the RF front end, was fabricated in 130 nm CMOS technology. The transmitter RFIC was directly attached to the system RF PCB using the Chip-on-Board packaging option. The First-Pass success of the system was ensured by paying particular attention to Signal/Power Integrity issues and following an IC-Package-PCB co-design procedure.
The transmitter was measured up to 1.5 Gbps, which, to the author’s knowledge, was the highest speed amongst the competitive Multi-Band Impulse-Radio UWB implementations in the literature. The corresponding energy efficiency was 21 pJoule/bit and the Error Vector Magnitude (EVM) 5.5%, while the proposed transmitter improved the spectral sidelobes by over 10 dB. Exploiting the reconfigurability of the transmitter, this thesis presents the first measurements at multi-Mbps speeds that completely meet the final version of the European spectrum emission mask.