Academic literature on the topic 'Modulation and Demodulation'

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Journal articles on the topic "Modulation and Demodulation"

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Li, Peng Fei, Jin Ping Li, and Xin Zhao. "Design and Simulation of 2PSK Modem." Applied Mechanics and Materials 321-324 (June 2013): 2914–18. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.2914.

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Based on the principle of the modulation and demodulation of Binary Phase Shift Keying(2PSK),a mathematical model for the modulation and demodulation of the 2PSK was built and the carrier signal was designed using the technology of Direct Digital Synthesis (DDS).Then,a model to simulate the hardware circuit of the modulation and demodulation of 2PSK was built,and then analyzed in Matlab and Modelsim.Simulation results show that the model not only properly realizes the function of 2PSK modulator-demodulator,but it also simplifies the hardware circuit and reduces the programming time.
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Mu, Shi Guang, Jin Rong Bai, and Xiu Feng Shi. "Optimization and Simulation of Demodulation and Decoding of the LDPC-BICM-ID System." Applied Mechanics and Materials 701-702 (December 2014): 1088–92. http://dx.doi.org/10.4028/www.scientific.net/amm.701-702.1088.

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In the bit interleaving coded modulation (BICM-ID) solution,includes the demodulator and decoder into the iteration and decoding process, and the decoding is completed between demodulator and decoder. In studies, it have been found that the oscillation is generated on logarithmic likelihood ratio (LLR) because the soft information generated by all previous BP iterations is ignored in this solution, so that the BP soft information output by the final BP iterative decoding is not always reliable. In this paper, the above problem is solved by optimizing the iterative demodulation and decoding solution. Aiming at this problem, this paper firstly puts forward a kind of optimization scheme about iterative demodulation and decoding, then the simulation analysis, the result show that, under the premise of ensuring the system complexity basically unchanged, can improve the demodulation and decoding performance of LDPC coded modulation and demodulation system.
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Liu, Xiao Jian, Wei Xu, and Jue Wang. "LDPC Coded PPM and Iterative Detection for Free-Space Optical Links." Applied Mechanics and Materials 651-653 (September 2014): 444–50. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.444.

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The pulse position modulation, which has the advantage of average energy efficiency and bandwidth efficiency, is an attractive modulation scheme for free-space optical communication. An important practical issue is to employ an efficient channel coding to this modulation. In this view, we consider the use of low density parity-check code together with iterative soft demodulation and channel decoding at the receiver. In particular, we discuss the calculation of the soft information at the demodulator to accommodate the LDPC decoder. We show that the proposed scheme is quite efficient against demodulation errors due to the receiver noise.
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Li, Guo Quan, Ke Tang, Jin Zhao Lin, Yu Pang, Zhang Yong Li, Qian Neng Zhou, and Lu Deng. "Exploration of Modulation and Demodulation for Body Area Networks." Applied Mechanics and Materials 427-429 (September 2013): 2558–61. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.2558.

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Modulation and demodulation are two important parts in BAN baseband transmission systems. Different demodulation algorithms may affect the BER performance of the entire system seriously. Referring to IEEE 802.15.6 BAN standard, theoretical analysis and algorithm design of the modulation and demodulation for π/2-DBPSK and π/4-DQPSK is carried out and simulation results of BER performance are presented in this paper. In AWGN channel, both modulations achieve good performance, and performance degradation of π/4-DQPSK happens in multipath channel which may not satisfy the requirements. Adaptive modulation is considered to solve this problem by choosing different modulation scheme according to channel quality.
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Sud, Seema. "High Order Chirp Rate Shift Keying Modulation Using the Fractional Fourier Transform." European Journal of Engineering Research and Science 2, no. 4 (April 14, 2017): 1. http://dx.doi.org/10.24018/ejers.2017.2.4.314.

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In this paper, we discuss an improved demodulation scheme using the Fractional Fourier Transform (FrFT) for a modulation scheme employing chirp rate shift keying (CrSK). CrSK in conjunction with the FrFT enable very high order, e.g. more than 32-ary modulation schemes to be achievable with good bit error rate (BER) performance, even in the absence of coding, thereby overcoming limitations of traditional schemes including phase shift keying (PSK) or QAM (quadrature amplitude modulation). By using an FrFT-based demodulator, we expand our demodulation degrees of freedom from a single (e.g. frequency) axis to an entire time-frequency domain, called the Wigner Distribution (WD). We show how the proposed demodulation scheme using the FrFT improves over past approaches by more than 7 dB, enabling us to achieve close to 4-ary performance with a 32-ary modulation scheme. This enables future systems to operate at 5 bits/s/Hz bandwidth efficiency, enhancing bandwidth utilization for future generation, high data rate, applications, such as internet.
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Li, Minwei, Yang Yu, Yang Lu, Xiaoyang Hu, Yaorong Wang, Shangpeng Qin, Junyang Lu, Junbo Yang, and Zhenrong Zhang. "Optical Microfiber All-Optical Phase Modulator for Fiber Optic Hydrophone." Nanomaterials 11, no. 9 (August 28, 2021): 2215. http://dx.doi.org/10.3390/nano11092215.

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In order to meet the needs of phase generated carrier (PGC) demodulation technology for interferometric fiber optic hydrophones, we proposed an optical microfiber all-optical phase modulator (OMAOPM) based on the photo-induced thermal phase shift effect, which can be used as a phase carrier generation component, so as to make the modulation efficiency and working bandwidth of this type of modulator satisfy the requirements of underwater acoustic signal demodulation applications. We analyzed the modulation principle of this modulator and optimized the structural parameters of the optical microfiber (OM) when the waist length and waist diameter of OM are 15 mm and 1.4 μm, respectively. The modulation amplitude of the modulator can reach 1 rad, which can meet the requirements of sensing applications. On this basis, the fiber optical hydrophone PGC-Atan demodulation system was constructed, and the simulated underwater acoustic signal test demodulation research was carried out. Experimental results showed that the system can demodulate underwater acoustic signals below 1 kHz.
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Zhu, Shou Zhong, Zheng Liu, and Wen Li Jiang. "Counteraction of Constant Modulus Demodulation Scheme for Mixing Space Borne AIS Signals." Applied Mechanics and Materials 340 (July 2013): 523–28. http://dx.doi.org/10.4028/www.scientific.net/amm.340.523.

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Demodulation scheme was proposed in satellite systems to received Automatic Identification Systems (AIS) signals, with the potential presence of other interfering signals. The counteraction of constant modulus demodulation scheme, referred to as CCMDS, yields a set of single short signals based on the prior information of AIS after estimating the frequency, code rate and modulation index. It demodulates the corresponding short codes according to the constant modulus characters of GMSK signals. The proposed demodulation scheme is simple and easy to implement. Simulations show the satisfying performance and engineering value in demodulating the mixing AIS signals.
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Kajur, Renuka, and K. V. Prasad. "Design and analysis of optimized CORDIC based GMSK system on FPGA platform." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (October 1, 2020): 4679. http://dx.doi.org/10.11591/ijece.v10i5.pp4679-4686.

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The Gaussian minimum shift keying (GMSK) is one of the best suited digital modulation schemes in the global system for mobile communication (GSM) because of its constant envelop and spectral efficiency characteristics. Most of the conventional GMSK approaches failed to balance the digital modulation with efficient usage of spectrum. In this article, the hardware architecture of the optimized CORDIC-based GMSK system is designed, which includes GMSK Modulation with the channel and GMSK Demodulation. The modulation consists of non-return zero (NRZ) encoder, an integrator followed by Gaussian filtering and frequency modulation (FM). The GMSK demodulation consists of FM demodulator, followed by differentiation and NRZ decoder. The FM Modulation and demodulation use the optimized CORDIC model for an In-phase (I) and quadrature (Q) phase generation. The optimized CORDIC is designed by using quadrant mapping and pipelined structure to improve the hardware and computational complexity in GMSK systems. The GMSK system is designed on the Xilinx platform and implemented on Artix-7 and Spartan-3EFPGA. The hardware constraints like area, power, and timing utilization are summarized. The comparison of the optimized CORDIC model with similar CORDIC approaches is tabulated with improvements.
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Weikert, O., and U. Zölzer. "A wireless MIMO CPM system with blind signal separation for incoherent demodulation." Advances in Radio Science 6 (May 26, 2008): 101–5. http://dx.doi.org/10.5194/ars-6-101-2008.

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Abstract. A multiple-input multiple-output (MIMO) wireless transmission system with continuous phase modulation (CPM) is considered. A novel MIMO CPM receiver with incoherent modulation is presented. The incoherent demodulation of CPM allows an uncomplicated handling of a frequency offset compared to coherent approaches requiring exact knowledge of the carrier frequency. Blind signal separation (BSS) is applied in the proposed MIMO CPM receiver to separate the signals without any knowledge of the MIMO channel. The BSS permits the demodulation of each separated signal by an incoherent CPM demodulator. For bandwidth efficient transmission partial response CPM and non-binary modulation is applied. The applicability of the proposed system is verified by simulation results.
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Chen, Xian Qing, Shu Bo Song, and Wu Zhou. "Demodulation of a M-Ray Position Phase Shift Keying System Using Multi-Class Support Vector Machine Classification." Applied Mechanics and Materials 687-691 (November 2014): 3840–43. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3840.

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In this paper, we introduce a new approach for nonlinear demodulation based on multi-class support vector machine (SVM) classification. We propose to measure the performance of this demodulator with different M which is the parameter of M-ray position phase shift keying (MPPSK) modulation, and compare with other demodulation technique. During demodulation, a few sampling points are chosen for multi-class SVM training and testing, which can reduce the complexity of system. Simulation results show that this new approach significantly outperforms the method of using Phase Locked Loop (PLL) demodulation by 10dB, and also better than Back Propagation Artificial Neural Networks (ANN-BP) classification demodulation. With the growth of M, the data rate increased and the performance become a little worse, but less bit SNR is used to achieve the same Symbol Error Rate (SER) as small M. So, it is an effective method to get better performance by using multi-class SVM classification technique for demodulation in MPPSK system.
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Dissertations / Theses on the topic "Modulation and Demodulation"

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Ozturk, Uygar. "Chaotic Digital Modulation And Demodulation." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606895/index.pdf.

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This thesis considers a communication system with chaotic modulation. Noise-like signals are generated by chaotic systems with different parameters to modulate binary digital signals. Demodulation is performed by both the Extended Kalman Filter (EKF) and Optimum Decoding Based Smoothing Algorithm (ODSA). Simulations are performed using both of these algorithms for different parameters affecting the performance of the communication system. Simulation results of these algorithms are compared.
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Achelengwa, Edison M. "Emona-based interactive amplitude modulation/demodulation iLab." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66402.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 76-78).
The MIT iLab Project has developed online laboratories (iLabs) which are lab stations that can be accessed and controlled remotely over the Internet. With iLabs, students can conduct real experiments on real equipment over the Internet. With the introduction of the National Instrument's Educational Laboratory Virtual Instrument Suite, NI ELVIS, in the development of iLabs, students to gain a better understanding of engineering concepts by obtaining real data from electronic labs. One of such crucial engineering concepts is telecommunications which plays a key role in transmitting information between people, systems and computers. There are many telecommunication schemes which exist today. The iLab developed in this thesis implements an experiment for studying one of such schemes, Amplitude Modulation. The NI ELVIS is used together with a device called the Emona Digital and Analog Telecommunications Experimenter (DATEx) to achieve the Amplitude Modulation lab setup. This iLab is an Interactive iLab, which gives one student at a time complete, real-time control over the lab set up. The Amplitude Modulation iLab will permit students to tune various controls and observe the behavior and changes of relevant signals, both in time domain and frequency domain. It will also permit students to compare different signals and retrieve data locally for post processing.
by Edison M. Achelengwa.
M.Eng.
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Strömberg, Erik. "Modulation and demodulation for radio based pricing." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199401.

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Lane, William D. "Spread spectrum multi-h modulation." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16944.

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Daqing, Huang. "Programming Code-Modulator and Demodulation-Decoder Suited to PCM Systems." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614707.

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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California
In order to suit the development of computer telemetry systems, we have developed the intelligent code-modulator and demodulation-decoder. In hardware, they consist of a monolithic processor and some high-integrated devices. Different code or decode ways and several subcarrier modulation or demodulation systems can be varied by carrying out corresponding software programs. In this paper, the equipments' hardware constructions and software cnarts and their main principles are presented.
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Cronin, Christopher Joseph. "Digital frequency demodulation for a laser vibrometer." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-11102009-020344/.

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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
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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Xiros, Nikolaos I. DEng. "Exact Feedback Linearization of Systems with State-Space Modulation and Demodulation." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2657.

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The control theory of nonlinear systems has been receiving increasing attention in recent years, both for its technical importance as well as for its impact in various fields of application. In several key areas, such as aerospace, chemical and petrochemical industries, bioengineering, and robotics, a new practical application for this tool appears every day. System nonlinearity is characterized when at least one component or subsystem is nonlinear. Classical methods used in the study of linear systems, particularly superposition, are not usually applied to the nonlinear systems. It is necessary to use other methods to study the control of these systems. For a wide class of nonlinear systems, a rather important structural feature comes from the strong nonlinearity appearing as coupling between spectrally decoupled parts of the system. Even in the case of low frequencies, where lumped models can still be employed the nonlinear coupling between parts of the system requires specific treatment, using advanced mathematical tools. In this context, an alternative, frequency domain approach is pursued here. In the rest of this work, a specific system form of linearly decoupled but nonlinearly coupled subsystems is examined. The mathematical toolbox of the Hilbert transform is appropriately introduced for obtaining two low-pass subsystems that form an equivalent description of the essential overall system dynamics. The nonlinear coupled dynamics is investigated systematically by partitioning the coupled system state vector in such a way as to fully exploit the low-pass and the band-pass intrinsic features of free dynamics. In particular, by employing the Hilbert Transform, a low-pass equivalent system is derived. Then, a typical case is investigated thoroughly by means of numerical simulation of the original coupled low and band-pass, real-state-variable system and the low-pass-equivalent, complex-state-variable derived one. The nonlinear model equations considered here pave the way for a systematic investigation of nonlinear feedback control options designed to operate mechatronic transducers in energy harvesting, sensing or actuation modes.
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Krause, Lloyd O., Carlos Reyes-Nieves, and Ivor Frazier. "DPSK MODULATION AND DEMODULATION USING BULK ACOUSTIC WAVE (BAW) DELAY ELEMENTS." International Foundation for Telemetering, 1986. http://hdl.handle.net/10150/615573.

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International Telemetering Conference Proceedings / October 13-16, 1986 / Riviera Hotel, Las Vegas, Nevada
DPSK modulation and demodulation are usually based on logical selection of the difference phase before modulation and the recovery sum phase after detection. Here, we describe an analogue procedure done directly on the PSK’d I-F. BAW delay elements are used in arrangements of feed-forward for difference modulation and of feedback for demodulation. Characteristics are described, and results of laboratory implementation tests for data rate and carrier frequency variations are given. An I-F of 60 MHz and a bit rate of 200 kHz were used as nominal values. Robust performance is indicated.
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Raghu, Swathi. "Combinatorial Modulation and Coherent Demodulation of Bi-orthogonal M-ary Frequency Shift Keying." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1449108844.

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Books on the topic "Modulation and Demodulation"

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Bedrosian, Edward. Amplitude and phase demodulation of filtered AM/PM signals. Santa Monica, CA: Rand, 1986.

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P, Miller Susan, and United States. National Aeronautics and Space Administration., eds. Advanced Modulation Technology Development for earth stattion demodulator applications: Coded modulation system development. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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M, Jamali M., Eugene Linus P, and Lewis Research Center, eds. A parallel-pipelined architecture for a multi carrier demodulator: Final report. Toledo, Ohio: Dept. of Electrical Engineering, College of Engineering, University of Toledo, 1991.

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A parallel-pipelined architecture for a multi carrier demodulator: Final report. Toledo, Ohio: Dept. of Electrical Engineering, College of Engineering, University of Toledo, 1991.

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Book chapters on the topic "Modulation and Demodulation"

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Connor, Frank R. "Demodulation." In Modulation, 89–120. Wiesbaden: Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-322-87811-3_6.

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Marsch, Patrick, and Jyrki Penttinen. "Modulation and Demodulation." In The Telecommunications Handbook, 261–80. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118678916.ch10.

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Gier, K. M., C. Heckel, J. Reutter, W. Schmid, S. Schmoll, and H. Tschieche. "Modulation und Demodulation." In Taschenbuch der Hochfrequenztechnik, 577–640. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-96894-5_14.

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Gier, K. M., C. Heckel, J. Reutter, W. Schmid, S. Schmoll, and H. Tschieche. "Modulation und Demodulation." In Taschenbuch der Hochfrequenztechnik, 1–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-96896-9_1.

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Zinke, Otto, and Hans Ludwig Hartnagel. "Modulation, Tastung, Demodulation." In Lehrbuch der Hochfrequenztechnik, 480–561. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-01054-9_6.

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Weik, Martin H. "modulation-demodulation linearity." In Computer Science and Communications Dictionary, 1037. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_11725.

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Gier, K. M., C. Heckel, J. Reutter, W. Schmid, S. Schmoll, and H. Tschiesche. "Modulation und Demodulation." In Taschenbuch der Hochfrequenztechnik, 1–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-58105-2_1.

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Zinke, Otto, and Heinrich Brunswig. "Modulation, Tastung, Demodulation." In Springer-Lehrbuch, 532–660. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58640-8_6.

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Protopopov, Vladimir. "Modulation-Demodulation Techniques." In Practical Opto-Electronics, 111–42. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04513-9_4.

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Zieliński, Tomasz P. "Frequency Modulation and Demodulation." In Starting Digital Signal Processing in Telecommunication Engineering, 517–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-49256-4_18.

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Conference papers on the topic "Modulation and Demodulation"

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Kikuchi, Kazuro. "Coherent optical modulation and demodulation." In 2010 9th International Conference on the Optical Internet (COIN). IEEE, 2010. http://dx.doi.org/10.1109/coin.2010.5546589.

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Schlegel, Christian, and Dmitri Truhachev. "Generalized Modulation and Iterative Demodulation." In 2008 IEEE International Zurich Seminar on Communications (IZS). IEEE, 2008. http://dx.doi.org/10.1109/izs.2008.4497280.

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Chen, Qixing, and Guozhong Zhou. "Demodulation-Oriented Automatic Modulation Identification Algorithm." In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.316.

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Chou, Wen-chieh, Yu-chun Hsu, and Lu-po Liao. "Modulation/ Demodulation System for Capacitive Sensors." In 2006 International Microsystems, Package, Assembly Conference Taiwan. IEEE, 2006. http://dx.doi.org/10.1109/impact.2006.312191.

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Jin Qi. "A new modulation and demodulation scheme." In 2010 International Conference on Future Information Technology and Management Engineering (FITME). IEEE, 2010. http://dx.doi.org/10.1109/fitme.2010.5654906.

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Tünnermann, Henrik, Philipp Jahn, Volker Quetschke, Jörg Neumann, Dietmar Kracht, and Peter Wessels. "SBS Mitigation via Phase Modulation and Demodulation." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/cleo_si.2014.sw3n.2.

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Benhaoues, A., C. Tanougast, H. Mayache, S. Toumi, and A. Dandache. "Digital synthesis architecture for modulation and demodulation." In 2013 25th International Conference on Microelectronics (ICM). IEEE, 2013. http://dx.doi.org/10.1109/icm.2013.6735023.

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Zhou, Lei, Qiao Cai, Fangming He, and Hong Man. "MSOM based automatic modulation recognition and demodulation." In 2011 34th IEEE Sarnoff Symposium. IEEE, 2011. http://dx.doi.org/10.1109/sarnof.2011.5876460.

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Xing, Cairong, Anhong Wang, Suyue Li, Peihao Li, and Jing Zhang. "Random aliasing modulation with decision-directed demodulation." In 2017 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC). IEEE, 2017. http://dx.doi.org/10.1109/apsipa.2017.8282086.

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Yang, Wei, Yuwen Wang, Yongwei Li, and Yingzhu Chen. "Digital Modulation and Demodulation Technique of FSK." In 2nd International Conference on Computer Engineering, Information Science & Application Technology (ICCIA 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/iccia-17.2017.136.

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Reports on the topic "Modulation and Demodulation"

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Pizzillo, Thomas J., and H. B. Wallace. A Technique for Calibrating the Phase Detector of Wideband Radars Using a Phase Modulation and Demodulation Scheme. Fort Belvoir, VA: Defense Technical Information Center, May 1998. http://dx.doi.org/10.21236/ada346080.

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