Relevant bibliographies by topics / Digital frequency modulation and demodulation

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Digital frequency modulation and demodulation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Digital frequency modulation and demodulation"

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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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Ruppert, Michael G., David M. Harcombe, Michael R. P. Ragazzon, S. O. Reza Moheimani, and Andrew J. Fleming. "A review of demodulation techniques for amplitude-modulation atomic force microscopy." Beilstein Journal of Nanotechnology 8 (July 10, 2017): 1407–26. http://dx.doi.org/10.3762/bjnano.8.142.

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In this review paper, traditional and novel demodulation methods applicable to amplitude-modulation atomic force microscopy are implemented on a widely used digital processing system. As a crucial bandwidth-limiting component in the z-axis feedback loop of an atomic force microscope, the purpose of the demodulator is to obtain estimates of amplitude and phase of the cantilever deflection signal in the presence of sensor noise or additional distinct frequency components. Specifically for modern multifrequency techniques, where higher harmonic and/or higher eigenmode contributions are present in the oscillation signal, the fidelity of the estimates obtained from some demodulation techniques is not guaranteed. To enable a rigorous comparison, the performance metrics tracking bandwidth, implementation complexity and sensitivity to other frequency components are experimentally evaluated for each method. Finally, the significance of an adequate demodulator bandwidth is highlighted during high-speed tapping-mode atomic force microscopy experiments in constant-height mode.
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BERNHARDT, PAUL A. "COMMUNICATIONS USING CHAOTIC FREQUENCY MODULATION." International Journal of Bifurcation and Chaos 04, no. 02 (April 1994): 427–40. http://dx.doi.org/10.1142/s0218127494000289.

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Chaotic Frequency Modulation (CFM) provides the basis for a nonlinear communications system with (1) good noise suppression and (2) analogue signal encryption for private and secure communications links. CFM is a generalization of conventional Wideband Frequency Modulation (WFM) where the information about modulation samples mk are contained in the lengths of the periods pk for the kth cycle of the WFM waveform. A WFM modulator produces waveform periods described by an invertible function of the form pk=F(mk). Chaotic FM uses a map of the pulse periods to produce a noise-like pulse train even with a constant signal. The basis for CFM is a function pk=F(mk; pk−1, pk−2, …, pk−i), where i is the dimensionality of the map. A practical realization for a CFM transmitter employs an autonomous chaotic relaxation oscillator (ACRO) circuit for use as a chaotic voltage-controlled oscillator (CVCO). The ACRO is simple to construct, consisting of only two capacitors, one inductor, a bistable nonlinear element, and a modulated current source. The CVCO period (pk) is a nonlinear function of the current (mk) and the two previous pulse periods. Demodulation requires the use of at least three successive waveform-periods. Experimental and theoretical studies of the CVCO circuit have shown that (1) the ACRO return maps of pulse periods are embedded in three dimensions, (2) chaotic outputs are difficult to decode without prior knowledge of the circuit parameters, and (3) demodulation may be accomplished with a digital signal processor.
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Li, Chen Wu, Jian Zhang, Qin Xie, and Xiao Hong Zhang. "Carrier Modulation Technology Based on Orthogonal Frequency Division Multiplexing." Advanced Materials Research 774-776 (September 2013): 1671–76. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1671.

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This paper first analyzes the transmission characteristics of low-voltage power line channels with the focus on the study of carrier modulation technology regarding the power line communication part, then proposes the orthogonal frequency division multiplexing technology that serves for the digital communication of family network power line communication gateways, analyzes the OFDM system principle, actulizes OFDM modulation and demodulation through discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT), and build the OFDM simulation model. Finally, a specific plan of using power lines as the family network transmission media is proposed.
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Manning, Christopher J., and Peter R. Griffiths. "Step-Scanning Interferometer with Digital Signal Processing." Applied Spectroscopy 47, no. 9 (September 1993): 1345–49. http://dx.doi.org/10.1366/0003702934067630.

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A novel step-scan FT-IR spectrometer incorporating a digital signal processor for demodulation of the detector signal is described. The potential advantages of this method of signal processing are discussed and illustrated. The instrument is based on a commercial cube-corner interferometer which has been modified by replacement of the drive motor with a stepper motor-micrometer and piezoelectric transducer combination. The interferometer retardation is feedback controlled by a 486–50 personal computer, which also controls the digital signal processor and collects spectral data. More than one phase modulation frequency can be imposed simultaneously, allowing for a multiplex advantage in photoacoustic depth profiling. Digital signal processing allows for simultaneous demodulation of multiple frequencies which would normally require several lock-in amplifiers. Data that illustrate the feasibility of these concepts are presented. The suitability of this instrument for double-modulation step-scan FT-IR measurements such as polymer stretching and electrochemically modulated step-scan FT-IR is also discussed.
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Ghauri, Sajjad Ahmed. "KNN BASED CLASSIFICATION OF DIGITAL MODULATED SIGNALS." IIUM Engineering Journal 17, no. 2 (November 30, 2016): 71–82. http://dx.doi.org/10.31436/iiumej.v17i2.641.

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Demodulation process without the knowledge of modulation scheme requires Automatic Modulation Classification (AMC). When receiver has limited information about received signal then AMC become essential process. AMC finds important place in the field many civil and military fields such as modern electronic warfare, interfering source recognition, frequency management, link adaptation etc. In this paper we explore the use of K-nearest neighbor (KNN) for modulation classification with different distance measurement methods. Five modulation schemes are used for classification purpose which is Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), 16-QAM and 64-QAM. Higher order cummulants (HOC) are used as an input feature set to the classifier. Simulation results shows that proposed classification method provides better results for the considered modulation formats.
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Mayer, Kayol Soares, Candice Müller, Fernando Cesar Comparsi de Castro, and Maria Cristina Felippetto de Castro. "A New CPFSK Demodulation Approach for Software Defined Radio." Journal of Circuits, Systems and Computers 28, no. 14 (February 8, 2019): 1950243. http://dx.doi.org/10.1142/s0218126619502438.

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This paper proposes a new coherent Frequency-Shift Keying (FSK) demodulation technique for software defined radio platform, based on a new Digital Phase Locked Loop (DPLL) architecture. The proposed DPLL addresses the frequency dependence on classic DPLL architectures found in the literature. In classical approaches, the loop filter constants are dependent on the frequency level of the FSK transmitted symbols. The proposed approach applies a simpler feedback loop, with a single integrator and a phase detector architecture based on the small-angle approximation [Formula: see text], which resulted in a DPLL totally independent of frequency. The proposed demodulator has been implemented in Very High Speed Integrated Circuits (VHSIC) Hardware Description Language (VHDL) and evaluated for continuous-phase frequency shift keying (CPFSK) and Gaussian minimum shift keying (GMSK) signals. For CPFSK signals, the demodulator has been evaluated for 2, 4 and 8 frequency levels, with modulation indexes [Formula: see text], [Formula: see text] and [Formula: see text], respectively. For evaluation of GMSK signals, several Gaussian filter bandwidths were considered. In addition, a brief analysis for 2-CPFSK and GMSK is presented over multipath and carrier frequency offset. Results show that the proposed method presents a significantly reduced bit error rate when compared to other coherent methods presented in the literature.
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Drapcho, David L., Raul Curbelo, Eric Y. Jiang, Richard A. Crocombe, and William J. McCarthy. "Digital Signal Processing for Step-Scan Fourier Transform Infrared Photoacoustic Spectroscopy." Applied Spectroscopy 51, no. 4 (April 1997): 453–60. http://dx.doi.org/10.1366/0003702971940486.

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A software-based digital signal processing (DSP) method using the data system processor has been developed to demodulate the photoacoustic responses of a sample to the fundamental phase modulation frequency and its harmonic frequencies (up to the ninth harmonic) in step-scan FT-IR photoacoustic measurements, without the use of any additional hardware. The DSP algorithm and its sampling depth multiplexing advantages are compared to conventional hardware demodulation. Comparison of results from the DSP method to those from hardware demodulators are shown at both the phase modulation frequency and the harmonics, and application of the DSP method to step-scan photoacoustic measurements with phase modulation is discussed as it applies to obtaining depth profile information in heterogeneous materials.
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Li, Nan, Yi Nan Wang, Hong Shan Nie, Hong Qi Yu, and Hui Xu. "Biomaterial Impedance Analyzer Based on Digital Auto Balancing Bridge." Advanced Materials Research 291-294 (July 2011): 1259–62. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1259.

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This paper presents the design method of a novel biomaterial impedance analyzer based on digital auto balancing bridge method. The system hardware mainly consists of FPGA, ADC, DACs and operational amplifiers. Many DSP algorithms such as direct digital frequency synthesis (DDS), digital phase sensitive demodulation (DPSD), digital modulation and digital filter are implemented in FPGA to realize the auto balancing function of the bridge circuit. Simulation results show that the system has good performance from low frequency to 10MHz. It is suitable for EIS application in biomaterial analysis.
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Aminah, Siti, Asep Deni Mulyadi, and Yuliadi Erdani. "The Wireless Acquisition Data System Simulator Design on Automatic Weather Monitoring Station." MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering 1, no. 3 (September 1, 2019): 51–62. http://dx.doi.org/10.46574/motivection.v1i3.33.

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The Wireless Acquisition Data System Simulator Design on Automatic Weather Monitoring Station is means of collecting, monitoring, and controlling some long distance subsystems. Automatic weather monitoring station is device for receiving data by a censor in use to gauge some weather parameters. In this Research we develop an automatic weather monitoring station design simulator by creating a subsystem in the form of prototype, using Digital Pin and Analog Pin from the microcontroller. Sensor characteristics are considered to measure several weather parameters. The principles of a system function are it will have to collect data from some subsystems to accommodate in a database, able to control and deliver instructions to the subsystem. The communication system makes the use of radio frequency by means of Frequency Shift Keying (FSK) method through Handy Talky (HT), picked out because advantages of lower power consumptions and long range of transmission. Additional advantages are, although catastrophes, data communication using HT allows to keep fast transmission. The transmission of data using HT media require a signal converter by which HT is operated by analogue signal (sound), while censor and microcontroller by digital signal and, therefore, Modulation and Demodulation techniques are necessary. The Modulation functions to convert digital signal into analogue, and just the opposite to the Demodulation, the Modulation and Demodulation processes is using IC TCM3105. The results of the trial suggest that system design has proper functions, the communication process in this system is two-ways communication, the process was fast working in either transmitter mode or receiver mode.
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Dissertations / Theses on the topic "Digital frequency modulation and demodulation"

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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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Peng, Song, Zhang XiaoLin, Cao Xue, and Qi Xia. "THE APPLICATION OF DIGITAL DEMODULATION TECHNIQUE FOR FREQUENCY MODULATION SIGNAL IN TELEMETRY RECEIVER." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/604956.

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International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California
Combined with an example of digital telemetry receiver design, this paper mainly discusses the application of software radio in telemetry receiver. The paper begins with an introduction of applying high efficiency digital filter and math analysis in quadrature digital frequency modulation and demodulation to digital frequency conversion technique. Next, Simulink/Matlab is used to simulate digital telemetry receiver. The method of simulation, analysis and calculation of performance and result of simulation are all available. In the end, the paper discusses digital telemetry receiver design and implement by making use of software radio technique, the circuits apply HSP50214 chip of Intersil Co., CPLD implements of Altera Co. and PC Bus. The sample is an expansion card for personal computer. Result of test, performance of the receiver and conclusion are given out, which show fine performance of receiver and can be apply to practice. The lever of this technology has reached first class in the world.
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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
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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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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Lin, Chun-Ching. "Demodulation of Narrowband Radio Frequency Signals by Aliasing Sampling." PDXScholar, 1996. https://pdxscholar.library.pdx.edu/open_access_etds/5286.

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The objective of this thesis is to study the demodulation of narrowband radio frequency signals by aliasing sampling in order to reduce the sampling rate. The spectrum can be recreated at the lower frequency position by aliasing sampling. However, if the sampling rate is deviated from the desired one, error will occur. The sensitivity to the frequency error of aliasing sampling is studied. One main reason of the deviation of the sampling rate is the frequency drifting of the local oscillator. Being able to compensate the oscillator drifting errors inexpensively, automatic frequency control (AFC) loops are important at receivers. Two major digital AFC algorithms are studied. One is the Phase method AFC, and the other is the Magnitude method AFC. Study indicates that both methods perform almost equally well. One adaptive AFC algorithm is also proposed. The scheme of the adaptive AFC algorithm is to use Upper-bound and Lower-bound techniques to squeeze the frequency errors. It is shown that the adaptive AFC algorithm can achieve up to 20 dB average signal-to-noise power ratio over the Magnitude method AFC under a noisy environment.
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Yang, Runfeng. "Multiband orthogonal frequency division multiplexing modulation and demodulation for wireless universal serial bus." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499368.

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Wireless Universal Serial Bus (W-USB) has been proposed to offer a mechanism in short range and high speed Wireless Personal Area Networks (WPAN). Wireless USB has now been standardized by utilizing the common WiMedia Ultra Wideband (UWB) radio platform to use the services of Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) as the transport mechanism. With regards to the high data rate mode using DCM modulation scheme, different DCM demapping methods resulting in different system performance are presented, which include soft bit demapping, Maximum Likelihood (ML) soft bit demapping and I Log Likelihood Ratio (LLR) demapping. The proposed Channel State Information (CSl) aided scheme coupled with the band hopping information is used as the further technique to improve the DCM demapping performance.
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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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Ndovi, Lusungu. "Benefits to processor load for quadrature baseband versus radio frequency demodulation algorithms." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1946.

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Bax, Walter T. "Modulation and frequency synthesis for wireless digital radio." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/NQ48341.pdf.

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Bax, Walter T. (Walter Timothy) Carleton University Dissertation Engineering Electronics. "Modulation and frequency synthesis for wireless digital radio." Ottawa, 1999.

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Books on the topic "Digital frequency modulation and demodulation"

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Moose, Paul H. A progress report on communications digital signal processing: Theory and performance of frequency domain differentially encoded multi-frequency modulation. Monterey, Calif: Naval Postgraduate School, 1990.

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Moose, Paul H. Theory of multi-frequency modulation (MFM) digital communications. Monterey, Calif: Naval Postgraduate School, 1989.

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Nesenbergs, M. Power spectral densities for selected digital phase-continuous MFSK emissions. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1989.

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L, Smith D., Jones L. Thomas, and United States. National Telecommunications and Information Administration., eds. Power spectral densities for selected digital phase-continuous MFSK emissions. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1989.

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McNeal, Jeff D. A comparison of two types of zero-crossing FM demodulators for wireless receivers. 1998.

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Center, Langley Research, ed. Analog FM/FM vs. digital color tv transmission aboard space station. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Software Radio Architecture: Object-Oriented Approaches to Wireless Systems Engineering. Wiley-Interscience, 2000.

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Mitola, Joseph III. Software Radio Architecture: Object-Oriented Approaches to Wireless Systems Engineering. Wiley & Sons, Incorporated, John, 2008.

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Mitola, Joseph III. Software Radio Architecture: Object-Oriented Approaches to Wireless Systems Engineering. Wiley & Sons, Incorporated, John, 2004.

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(Editor), Joseph III Mitola, and Zoran Zvonar (Editor), eds. Software Radio Technologies: Selected Readings. Wiley-IEEE Press, 2001.

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Book chapters on the topic "Digital frequency modulation and demodulation"

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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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Uzmi, Zartash Afzal. "Digital Phase Modulation and Demodulation." In Handbook of Computer Networks, 509–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256053.ch33.

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Weik, Martin H. "digital frequency modulation." In Computer Science and Communications Dictionary, 410. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5030.

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Zieliński, Tomasz P. "Amplitude Modulation, Demodulation, and Carrier Recovery." In Starting Digital Signal Processing in Telecommunication Engineering, 541–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-49256-4_19.

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Lau, F. C. M., and C. K. Tse. "Chaos-Based Digital Modulation and Demodulation Techniques." In Chaos-Based Digital Communication Systems, 17–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05183-2_2.

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Song, Xu, DaYong Liu, and Zhe Chen. "Gauss White Noise in Digital Frequency Modulation Scheme." In Lecture Notes in Electrical Engineering, 1445–53. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4981-2_158.

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Zhu, Hongli, and Jin Chen. "Design of Modulation and Demodulation System Based on Full Digital Phase-Locked Loop." In Lecture Notes in Electrical Engineering, 1438–44. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9409-6_172.

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Nishimura, Akira. "Detection of Frequency-Scale Modification Using Robust Audio Watermarking Based on Amplitude Modulation." In Digital-Forensics and Watermarking, 299–311. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31960-5_25.

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Xu, Jian, Zhiyin Gan, Xiong Shi, and Sheng Liu. "Digital Controlled Frequency Modulation Microwave Signal for CPT Atomic Clock." In Lecture Notes in Electrical Engineering, 569–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19706-2_73.

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Lin, W. Sabrina, and K. J. Ray Liu. "Modulation Forensics for Wireless Digital Communications in Frequency-Selective Fading Channels." In Securing Wireless Communications at the Physical Layer, 379–96. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1385-2_16.

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Conference papers on the topic "Digital frequency modulation and demodulation"

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Escalera, Nestor, Richard DeSalvo, and Charles Middleton. "Distribution, down-conversion, and demodulation of high spectral efficiency digital modulation signals using photonic frequency converters." In 2014 IEEE Avionics, Fiber-Optics and Photonics Technology Conference (AVFOP). IEEE, 2014. http://dx.doi.org/10.1109/avfop.2014.6999442.

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Zeng, Lang, Zuodong Zhang, Haoxuan Chen, Tianqi Gao, Deming Zhang, Mingzhi Long, Youguang Zhang, and Weisheng Zhao. "Modulation and Demodulation of Digital Frequency Shift Keying System Based on Spin Torque Nano Oscillator with Voltage Controlled Magnetic Anisotropy Effect." In 2019 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2019. http://dx.doi.org/10.1109/iscas.2019.8702646.

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Luo, Huageng, Roengchai Chumai, Nicolas Peton, Brian Howard, and Arun Menon. "Torsional Vibration Detection Using High Sampling Rate and High Resolution Keyphasor Information." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12367.

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Torsional vibration excitation in rotating machinery can cause system reliability issues or even catastrophic failures. Torsional vibration detection and monitoring becomes an important step in rotating machinery condition monitoring, especially for those machines driven by a variable frequency drive (VFD), a pulse width modulation motor (PWM), or a synchronous motor (SM), etc. Traditionally, the torsional vibration is detected by a phase demodulation process applied to the signals generated by tooth wheels or optical encoders. This demodulation based method has a few unfavorable issues: the installation of the tooth wheels needs to interrupt the machinery normal operation; the installation of the optical barcode is relatively easier, however, it suffers from short term survivability in harsh industrial environments. The geometric irregularities in the tooth wheel and the end discontinuity in the optical encoder will sometimes introduce overwhelming contaminations from shaft order response and its harmonics. In addition, the Hilbert Transform based phase demodulation technique has inevitable errors caused by the edge effect in FFT and IFFT analyses. Fortunately, in many industrial rotating machinery applications, the torsional vibration resonant frequency is usually low and the Keyphasor® and/or encoder for speed monitoring is readily available. Thus, it is feasible to use existing hardware for torsional vibration detection. In this paper, we present a signal processing approach which used the Keyphasor/encoder data digitized by a high sampling rate and high digitization resolution analog-to-digital (A/D) convertor to evaluate the torsional vibration directly. A wavelet decomposition (WD) based method was used to separate the torsional vibration from the shaft speed, so that the time history of the torsional vibrations can be extracted without significant distortions. The developed approach was then validated through a synchronous motor fan drive and an industrial power generation system. Detailed results are presented and discussed in this paper.
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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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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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Su, Sy-Haur, Shuw-Guann Lin, Hsu-Feng Hsiao, Da-Chiang Chang, and Hwann-Kaeo Chiou. "Digital Modulation/Demodulation Measurement System within Connected Solution." In 2012 18th International Mixed-Signals, Sensors and Systems Test Workshop (IMS3TW 2012). IEEE, 2012. http://dx.doi.org/10.1109/ims3tw.2012.20.

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"Performance Analysis of different Digital Modulation/Demodulation Based on BERTool." In 2018 2nd International Conference on Systems, Computing, and Applications. Francis Academic Press, 2018. http://dx.doi.org/10.25236/systca.18.102.

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Bogdan Staszewski, Robert. "All-digital RF frequency modulation." In 2011 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2011. http://dx.doi.org/10.1109/iscas.2011.5937593.

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Wang, Yutao, Fengdan Diao, Gang Yang, Xichen Wei, Zhong Wang, and Yu Luo. "An Improved Digital Demodulation Algorithm in Low Sampling Frequency." In 2020 39th Chinese Control Conference (CCC). IEEE, 2020. http://dx.doi.org/10.23919/ccc50068.2020.9188529.

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Punchalard, R., and A. Nosan. "Frequency modulation using digital sinusoidal oscillator." In 2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON 2012). IEEE, 2012. http://dx.doi.org/10.1109/ecticon.2012.6254118.

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