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Journal articles on the topic 'Demodulator'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Peng, Kang-Chun, and Chan-Hung Lee. "A Novel Quadrature-Tracking Demodulator for LTE-A Applications." Wireless Communications and Mobile Computing 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/8712414.

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This work develops an advanced quadrature-tracking demodulation technique for coherently demodulating the orthogonal frequency-division multiplexing (OFDM) signal of LTE-A systems. To overcome the fact that traditional coherent demodulators are extremely sensitive to the quadrature imbalance of a system, especially an OFDM system, the proposed architecture uses a novel quadrature phase-locked loop (QPLL) to track simultaneously the in phase (I-phase) and the quadrature phase (Q-phase) of the received signal. This advanced quadrature-tracking demodulator is realized using TSMC 0.18 μm CMOS tech

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2

Harcombe, David M., Michael G. Ruppert, and Andrew J. Fleming. "A review of demodulation techniques for multifrequency atomic force microscopy." Beilstein Journal of Nanotechnology 11 (January 7, 2020): 76–91. http://dx.doi.org/10.3762/bjnano.11.8.

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This article compares the performance of traditional and recently proposed demodulators for multifrequency atomic force microscopy. The compared methods include the lock-in amplifier, coherent demodulator, Kalman filter, Lyapunov filter, and direct-design demodulator. Each method is implemented on a field-programmable gate array (FPGA) with a sampling rate of 1.5 MHz. The metrics for comparison include the sensitivity to other frequency components and the magnitude of demodulation artifacts for a range of demodulator bandwidths. Performance differences are demonstrated through higher harmonic

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3

Kudinova, T. V., G. A. Osipov, and F. A. Nanay. "Digital demodulators for analog signals: comparative analysis and simulation." Journal of Physics: Conference Series 2094, no. 2 (2021): 022048. http://dx.doi.org/10.1088/1742-6596/2094/2/022048.

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Abstract The paper examines digital demodulators for two commonly used techniques of modulating analog signals: amplitude modulation (AM) and frequency modulation (FM). The described demodulators can be used to perform the radio monitoring of narrowband signal ranges including FM broadcasting stations as well as license-free CB, LPD, PMR bands. The demodulators considered in this work are intended for programmable devices with limited memory and computing resources, for example, for STM32F407 microcontrollers and similar ones. The paper presents the analysis and simulation of demodulators for

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4

Fu, Meng, Stan Skafidas, and Iven Mareels. "A Novel Delay-Based GFSK Demodulator in 65 nm CMOS for Low Power Biomedical Applications." International Journal of Interdisciplinary Telecommunications and Networking 10, no. 3 (2018): 21–32. http://dx.doi.org/10.4018/ijitn.2018070103.

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This article describes how, in recent years, with the development of microelectronics, implantable electronic devices have been playing a significant role in modem medicine. Examples of such electronic implant devices are, for instance, retinal prosthesis and brain implants. It brings great challenges in low power radio frequency (RF) and analog designs. This article presents a low power Gaussian frequency shift keying (GFSK) demodulator designed for Medical Implant Communications Service (MICS) band Receiver. This demodulator utilizes a novel structure that a wide IF range can be handled and

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Dampage, Udaya, S. M. R. P. Amarasooriya, R. A. S. M. Samarasinghe, and N. A. Karunasingha. "Combined Classifier-Demodulator Scheme Based on LSTM Architecture." Wireless Communications and Mobile Computing 2022 (June 15, 2022): 1–9. http://dx.doi.org/10.1155/2022/5584481.

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When it comes to studies on smart receiver designs, using machine learning and deep learning techniques for the development of automatic modulation classifiers as well as demodulators which require little to no information about the transmitted signal or the channel state is an area of interest. Through this study, we have proposed a combined classifier-demodulator system that is entirely deep learning-based and one that is focused on higher-order quadrature amplitude modulation (QAM) schemes such as 64QAM and 256QAM that can be used in next-generation mobile technologies. The system was devel

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6

Brusin, E. "Frequency Modulated Signal’s Optimum Noncoherent Demodulator Performance." Proceedings of Telecommunication Universities 8, no. 1 (2022): 27–33. http://dx.doi.org/10.31854/1813-324x-2022-8-1-27-33.

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The article considers optimum noncoherent demodulator scheme. The symbol synchronization is key problem of demodulator’s performance. It is offered the resampler symbol synchronization sсhem. Modeling demodulator algorithm results is shown. The modeling results let to propose the optimum noncoherent demodulator scheme. It is shown that the demodulator provided near to ideal noncoherent performance. Based on the results presented in the paper, receivers of various broadband signals can be constructed.

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7

Apinut, Kaewmunee, and Khumsat Phanumas. "Single-phase binary phase-shift keying, quadrature phase shift keying demodulators using an XOR gate as a phase detector." Single-phase binary phase-shift keying, quadrature phase shift keying demodulators using an XOR gate as a phase detector 13, no. 6 (2023): 6092–101. https://doi.org/10.11591/ijece.v13i6.pp6092-6101.

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A single-phase/single-loop multiple-phase-shift-keying (m-PSK) demodulator is described. The demodulator relies on a linear range of an exclusive-OR (XOR) gate employed as a phase detector. The phase controller takes the average output from the XOR gate and performs a sub-ranging/re-scaling operation to provide an input signal to a voltage-controlled oscillator (VCO). The demodulator is truly modular which theoretically can be extended for an m-PSK signal. The proposed single-phase binary-/quadrature-PSK (BPSK/QPSK) demodulators have been implemented with low-cost discrete components. The core

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8

Xu, Yao-Hua, Shuai Yang, Hang Li, Ji-Ming Lv, and Na Bai. "Adaptive Noise-Resistant Low-Power ASK Demodulator Design in UHF RFID Chips." Electronics 10, no. 24 (2021): 3168. http://dx.doi.org/10.3390/electronics10243168.

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This paper presents a new signal demodulator for ultra-high frequency (UHF) radio frequency identification (RFID) tag chips. The demodulator is used to demodulate amplitude shift keying (ASK) modulated signals with the advantages of high noise immunity, large input range and low power consumption. The demodulator consists of a charge pump, an envelope detector, and a comparator. In particular, the demodulator provides a hysteresis input signal to the comparator through two envelope detectors, resulting in better noise immunity. The demodulator is based on a standard 0.13 µm CMOS process. The d

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9

Grzesiak, Krystian, and Zbigniew Piotrowski. "NN-Based 8FSK Demodulator for the Covert Channel." Sensors 22, no. 19 (2022): 7181. http://dx.doi.org/10.3390/s22197181.

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In this article, a superposition-based covert channel and its demodulator were proposed and examined. As a covert waveform, an 8FSK modulation was selected. The impact of the channel estimation error and resulting imperfect SIC operation (successive interference cancelation) on the covert information demodulation process was considered. Especially for this imperfection, an NN-based demodulator was proposed. The superiority of this solution over the traditional 8FSK correlator-based receiver was examined for various cases, including the hard- and soft-decision detectors. It was proven that, alt

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10

Winholtz, William S., and Lorraine Olson Ramig. "Vocal Tremor Analysis With the Vocal Demodulator." Journal of Speech, Language, and Hearing Research 35, no. 3 (1992): 562–73. http://dx.doi.org/10.1044/jshr.3503.562.

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Acoustic analysis of vocal tremor has the potential to make significant quantitative and diagnostic contributions to the study of vocal disorders. This paper presents a new device for analysis of vocal tremor. The Vocal Demodulator produces amplitude- and frequency-demodulated outputs and measures the frequency and level (percent) of low-frequency tremor components in sustained phonation. A standard microphone is used to transduce the voice signal for input to the demodulator. The input fundamental frequency (F o ) range is 70–1200 Hz, and frequency response of the amplitude and frequency demo

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11

Okuhata, Hiroyuki, Hiroshi Uno, Keiji Kumatani, Isao Shirakawa, and Toru Chiba. "A Low Power Receiver Architecture for 4 Mbps Infrared Wireless Communication." Journal of Circuits, Systems and Computers 07, no. 05 (1997): 483–94. http://dx.doi.org/10.1142/s021812669700036x.

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A high performance and low power architecture is devised for a 4 Mbps infrared wireless communication system dedicated to mobile computing. In this architecture, 4PPM (4-Pulse Position Modulation) infrared signals detected by an infrared receiver are digitized into TTL interface level pulses, and the digitized pulses are demodulated by a 1-bit digital demodulator. To extend the range of the link length, a 4PPM demodulator is synthesized to implement a demodulation algorithm which is constructed so as to accommodate the output tolerance of the infrared receiver. A part of the experimental resul

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12

Proshin, Fedor, Elena Kazakevich, Artem Alekseev, et al. "AMPLITUDE MANIPULATION SIGNAL DEMODULATOR WITH ADAPTIVE DECISION THRESHOLD." Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» 2025, no. 1 (2025): 31–41. https://doi.org/10.61260/2218-130x-2025-1-31-41.

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The purpose of this work is to develop a method for adaptive adjustment of the decision threshold value, which will allow demodulation of signal packets in the form of long sequences of amplitude-manipulated zeros (ones) transmitted in channels with fading with minimal errors. To achieve this goal, an analysis of existing prototype devices was carried out, the conditions of their applicability, weaknesses and properties were identified, on the basis of which a block diagram of the device was developed. To substantiate the advantages of the proposed demodulator, its experimental verification wa

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13

Nikolaev, G. N., and S. L. Mikerin. "Theoretical bases of combined nonlinear optical demodulator-amplifer for broadband microwave photonics system." Journal of Physics: Conference Series 2067, no. 1 (2021): 012018. http://dx.doi.org/10.1088/1742-6596/2067/1/012018.

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Abstract Our demodulator is based on the use of a strong light pump wave along with a signal modulated light wave. The demodulator is linear in terms of the modulation signal, which makes it possible to obtain a demodulated signal without harmonic distortion. The modulator conversion efciency and signal gain increase with increasing microwave baseband.

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14

Rytel-Andrianik, Rafał. "Noncircularity of Demodulated Radar Signal." International Journal of Electronics and Telecommunications 59, no. 3 (2013): 301–6. http://dx.doi.org/10.2478/eletel-2013-0036.

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Abstract The output of the quadrature demodulator is generally regarded as a complex signal that is circular if only the demodulator is well balanced. In the paper we analyze properties of quadrature demodulators, particularly digital one, and show that the output is noncircular also if the input signal is nonstationary. Then we find sources of this noncircularity and show that they stem from transients of the low-pass demodulator filter. This is quite important because nonstationary inputs are quite typical in radar where power of echoes depends strongly on range. In the first sections we als

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15

Parfeniuk, V. H., S. S. Sabadash, and R. L. Stavisiuk. "Optimum Coherent and Incoherent Demodulators of BPSK and DBPSK Radio Signals with Manchester Encoding." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 87 (December 30, 2021): 5–13. https://doi.org/10.20535/radap.2021.87.5-13.

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Algorithms and schemes of optimal coherent and incoherent demodulators of binary radio signals with phase and differential phase shift-keying (DPSK) with Manchester encoding of the modulating signal are proposed. The use of DPSK makes it possible to effectively deal with the phase ambiguity of the reference oscillation generator of the correlation receiver. This solution allows you to overcome the so-called <<reverse work>> effect in the demodulator of signal with phase-shift keying. Differential and Manchester encoding finds it's application in various areas of use of digital syst

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16

Chutpipat, Chaichomnan, and Khumsat Phanumas. "A 1.8 V 25 Mbps CMOS single-phase, phase-locked loop-based BPSK, QPSK demodulator." A 1.8 V 25 Mbps CMOS single-phase, phase-locked loop-based BPSK, QPSK demodulator 13, no. 6 (2023): 6102–17. https://doi.org/10.11591/ijece.v13i6.pp6102-6117.

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A single-phase binary/quadrature phase-shift keying (BPSK/QPSK) demodulator basing on a phase-locked loop (PLL) is described. The demodulator relies on a linear characteristic a rising-edge RESET/SET flipflop (RSFF) employed as a phase detector. The phase controller takes the average output from the RSFF and performs a sub-ranging/re-scaling operation to provide an input signal to a voltage-controlled oscillator (VCO). The demodulator is truly modular which theoretically can be extended for a multiple-PSK (m-PSK) signal. Symbol-error rate analysis has also been extensively carried out. Th

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17

Yan, Hao, Xiaoping Liao, Chenglin Li, and Chen Chen. "A Cascaded MEMS Amplitude Demodulator for Large Dynamic Range Application in RF Receiver." Micromachines 12, no. 12 (2021): 1515. http://dx.doi.org/10.3390/mi12121515.

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An amplitude demodulator with a large dynamic range, based on microelectromechanical systems (MEMS), is proposed in this paper. It is implemented as a cascade of a capacitive and a thermoelectric sensor. Two types of the transducer can improve the measurement range and enhance the overload capacity. This MEMS-based demodulation is realized by utilizing the square law relationship and the low-pass characteristic during the electromechanical and thermoelectric conversion. The fabrication of this device is compatible with the GaAs monolithic microwave integrated circuit (MMIC) process. Experiment

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18

Kaewmunee, Apinut, and Phanumas Khumsat. "Single-phase binary phase-shift keying, quadrature phase shift keying demodulators using an XOR gate as a phase detector." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6092. http://dx.doi.org/10.11591/ijece.v13i6.pp6092-6101.

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A single-phase/single-loop multiple-phase-shift-keying (<em><span lang="EN-US">m</span></em><span lang="EN-US">-PSK)</span><span lang="EN-US"> demodulator is described. The demodulator relies on a linear range of an exclusive-OR (XOR) gate employed as a phase detector. The phase controller takes the average output from the XOR gate and performs a sub-ranging/re-scaling operation to provide an input signal to a voltage-controlled oscillator (VCO). The demodulator is truly modular which theoretically can be extended for an </span><em><span

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19

Skorodumovs, A. "SDPSK-Specific Demodulation Method for the Nanortu Field-Programmable Gate Array / SDPSK-Specifiska Demodulācijas Metode Nanortutm Programmētajām Loģiskajām Integrācijas Shēmām." Latvian Journal of Physics and Technical Sciences 50, no. 1 (2013): 84–90. http://dx.doi.org/10.2478/lpts-2013-0006.

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The software-defined radio (SDR) solutions inpart flexibility to the satellite applications when the devices are physically inaccessible after the launch. The nanoRTU FPGA-based controller (AAC Microtec) may be programmed to serve as a software-defined differential phase shift keying (SDPSK) modem backend to be used in satellites for communication with the Earth. The modem consists of two units - a modulator and a demodulator. A fully functional symmetric SDPSK modulator for nanoRTU FPGA has already been implemented. The next step of the modem implementation is the development of demodulator.

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20

Chaichomnan, Chutpipat, and Phanumas Khumsat. "A 1.8 V 25 Mbps CMOS single-phase, phase-locked loop-based BPSK, QPSK demodulator." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6102. http://dx.doi.org/10.11591/ijece.v13i6.pp6102-6117.

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A single-phase binary/quadrature phase-shift keying (BPSK/QPSK) demodulator basing on a phase-locked loop (PLL) is described. The demodulator relies on a linear characteristic a rising-edge RESET/SET flip-flop (RSFF) employed as a phase detector. The phase controller takes the average output from the RSFF and performs a sub-ranging/re-scaling operation to provide an input signal to a voltage-controlled oscillator (VCO). The demodulator is truly modular which theoretically can be extended for a multiple-PSK (m-PSK) signal. Symbol-error rate analysis has also been extensively carried out. The pr

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21

Shahroury, Fadi R. "The Design Methodology of Fully Digital Pulse Width Modulation." Journal of Low Power Electronics and Applications 11, no. 4 (2021): 41. http://dx.doi.org/10.3390/jlpea11040041.

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This paper describes the design methodology and calibration technique for a low-power digital pulse width modulation demodulator to enhance its robustness against the process, voltage, and temperature variations in different process corners, in addition to intra-die variability, which makes it a very good choice for implantable monitoring sensors. Furthermore, the core of the proposed demodulator is fully digital. Thus, along with the proposed design methodology, the proposed demodulator can be simply redesigned in advanced subnanometer CMOS technologies without much difficulty as compared to

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22

Liu, Xiao Peng, Yan Han, Dong Dong Zhong, and Ming Yu Wang. "The Design and Implement of a Receiver for FSK Signal." Applied Mechanics and Materials 190-191 (July 2012): 739–41. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.739.

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A novel frequency shift keying (FSK) receiver is presented, including receiving antennas, a low noise amplifier (LNA), band-pass filters (BPF) and a novel all-digital 2-level FSK demodulator. The Matlab simulation results of the all-digital FSK demodulator show that it can improve bit error ratio (BER) performance compared with pseudo-coherent FSK demodulation (PCFSK). The novel FSK demodulator defined using Verilog HDL is easy to be implemented on Field Programmable Gate Array (FPGA) and in CMOS integrated circuit. The whole FSK receiver designed and implemented on a PCB board can receive FSK

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23

Abdou, Kaissoine, Antoine Khy, Kais Mabrouk, and Bernard Huyart. "Performance of 2–3.6 GHz Five-Port/Three-Phase Demodulators with Baseband AnalogI/QRegeneration Circuit in Direct-Conversion Receivers." Journal of Electrical and Computer Engineering 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/631867.

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A comparison between performance of a five-port demodulator (FPD) and a three-phase demodulator (TPD) with both architectures connected to a so-called basebandI/Qregeneration circuit is carried out. In order to compare these two receivers to a classical architecture, the performance of anI/Qdemodulator (IQD) is also presented. Measured results show the superiority of TPD and IQD over FPD in terms of residual DC offsets and 2nd order intermodulation distortion (IMD2) products, noise figure (NF), and sensitivity due to the use of active balanced mixers instead of diode power detectors. Lastly, d

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24

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 sol

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25

Yang, Ye, Jiang Wu, Hao Wu, and Yu Wang. "Research on onboard multistage digital demultiplexer for satellite communication based on MF-TDMA system." Journal of Physics: Conference Series 2524, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2524/1/012007.

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Abstract A new multicarrier multi-rate digital demultiplexer system structure based on MF-TDMA(Multi-Frequency Time Division Multiple Access) in a wideband satellite communication system is described. Compared with the traditional tree multicarrier demultiplexer method, the new structure uses a half-band filter instead of the quadrature mirror filter, which has three advantages: 1) It fully avoids the shortcomings of the traditional method, such as confusion distortion and amplitude distortion. 2) The computation to achieve filtering is reduced by nearly half. 3) It effectively improves the de

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26

Zhou, Jing, and Duandan Liang. "Intelligent Matching of the Control Voltage of Delay Line Interferometers for Differential Phase Shift Keying-Modulated Optical Signals." Photonics 8, no. 10 (2021): 428. http://dx.doi.org/10.3390/photonics8100428.

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In optical communications, differential phase shift keying (DPSK) provides a desired modulation format that offers high tolerance to nonlinear effects in high-speed transmissions. A DPSK demodulator converts the phase-coded signal into an intensity-coded signal at receivers. One demodulation scheme is called balanced detection and is based on a tunable delay line interferometer (DLI). Demodulation performances are determined by the phase delay generated by the DLI, while the phase delay is controlled by a tunable driving voltage on the DLI device. However, a problem in the dynamic adjustment o

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27

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

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Brusin, E. A. "The Resampling Methods Direct Sequence Spread Spectrum Signal’s Demodulator Implementation." Proceedings of Telecommunication Universities 10, no. 6 (2024): 7–18. https://doi.org/10.31854/1813-324x-2024-10-6-7-18.

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Relevance. The direct spread spectrum signals are widely used in navigation and communication systems recently. These signals prevail in modern satellite navigation systems and are used in various communication systems with code division multiplexing in particularly. In this regard, the tasks of building direct spread spectrum signals’ demodulators have the key importance. Mach importance in the construction of demodulators is the problem chip rate variability.The purpose of the study is to propose a demodulator structure focused on solving this problem.Methods. The research is based on comput

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Li, Qinglong, Yong Xu, Qiao Li, Kun Peng, and Xian Zhang. "A Demodulation Circuit For Analog Front End Of Passive Tag Chip." Journal of Physics: Conference Series 2065, no. 1 (2021): 012007. http://dx.doi.org/10.1088/1742-6596/2065/1/012007.

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Abstract The demodulation circuit designed in this paper is suitable for the analog front end of passive UHF RFID tag chip, which can handle ASK signals with large changes in amplitude, modulation depth and signal frequency. Its performance meets the requirements of standards ISO/IEC 18000-6C and GB/T 29768-2013. Envelope detection circuit and limiter circuit are simple in structure and do not consume power. The comparison reference voltage is taken according to the average value of the envelope high and low levels, and is less affected by the dynamic changes of the input signal. Changing the

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Chaudhari, Sandeep C., Yashwant Gupta, Ajith Kumar, Navnath D. Shinde, Sweta Gupta, and Ajay Vishwakarma. "Reducing Effects of Cross-Talk in a Radio Telescope Using Walsh Modulation." Journal of Astronomical Instrumentation 06, no. 01 (2017): 1641017. http://dx.doi.org/10.1142/s2251171716410178.

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Traditional Walsh technique is used to eliminate cross-talk in a array of radio telescope where achieving synchronization between modulator and demodulator without compromising sensitivity is a real challenge. The paper describes a novel approach named Walsh Delay Hunting (WDH) to synchronize independently running modulator and demodulator with no additional hardware. This approach is unique and can easily be implemented in any existing radio telescope with minimal changes, thus by putting Walsh modulator at telescope and demodulation can be done in digital back-end. The scheme greatly reduces

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Jitendra, Sunte. "Importance of Demodulator in Engineering and Medical Fields." Research and Reviews: Journal of Environmental Sciences 7, no. 1 (2025): 74–77. https://doi.org/10.5281/zenodo.14980499.

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<em>The sound waves, which are in the form of infrasonic and ultrasonic types, are available and produced as these are out of range for normal human beings. Infrasonic, which can’t be heard by the human capacity of the ear. But these can be heard by some kind of human, which is called a superpower; those are highly intelligent and gained by knowledge from hidden things. Some species of animals hear well infrasonic sounds, which are less than 20 dB, and some species, like dolphins and elephants, hear ultrasonic sounds at 130 dB and also higher ones that range up to some limit. This paper

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Chernoyarov, Oleg, Alexey Glushkov, Vladimir Litvinenko, Yuliya Litvinenko, and Boris Matveev. "Digital Demodulator of the Quadrature Amplitude Modulation Signals." Measurement Science Review 18, no. 6 (2018): 236–42. http://dx.doi.org/10.1515/msr-2018-0032.

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Abstract In this paper, the digital algorithm and the device for the demodulation of the quadrature amplitude modulation signals are considered. The fundamental advantages of our approach are simple hardware implementation, minimal number of arithmetic operations required over the signal period as well as the potential interference immunity in the presence of Gaussian noise. The expressions have been found for the error probability and their inaccuracy has been estimated. By means of the statistical simulation methods, the practical interference immunity of the introduced demodulator, together

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Ricci, Stefano, and Valentino Meacci. "Data-Adaptive Coherent Demodulator for High Dynamics Pulse-Wave Ultrasound Applications." Electronics 7, no. 12 (2018): 434. http://dx.doi.org/10.3390/electronics7120434.

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Pulse-Wave Doppler (PWD) ultrasound has been applied to the detection of blood flow for a long time; recently the same method was also proven effective in the monitoring of industrial fluids and suspensions flowing in pipes. In a PWD investigation, bursts of ultrasounds at 0.5–10 MHz are periodically transmitted in the medium under test. The received signal is amplified, sampled at tens of MHz, and digitally processed in a Field Programmable Gate Array (FPGA). First processing step is a coherent demodulation. Unfortunately, the weak echoes reflected from the fluid particles are received togeth

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Koseeyaporn, Jeerasuda, Paramote Wardkein, Ananta Sinchai, Chanapat Kaew-in, and Panwit Tuwanut. "Simplified Derivative-Based Carrierless PPM Using VCO and Monostable Multivibrator." Applied Sciences 15, no. 11 (2025): 6272. https://doi.org/10.3390/app15116272.

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This study proposes a derivative-based, carrierless pulse position modulation (PPM) scheme utilizing a voltage-controlled oscillator (VCO) and a monostable multivibrator. In contrast to conventional PPM systems that rely on reference carriers or complex demodulation methods, the proposed architecture simplifies signal generation by directly modulating the time derivative of the message signal. The modulated signal, when processed through standard analog demodulators, inherently yields the derivative of the original message. This behavior is first established through theoretical derivations and

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Mohamed Moubark, Asraf, and Sawal Hamid Md Ali. "A Novel Sample Based Quadrature Phase Shift Keying Demodulator." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/107831.

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This paper presents a new practical QPSK receiver that uses digitized samples of incoming QPSK analog signal to determine the phase of the QPSK symbol. The proposed technique is more robust to phase noise and consumes up to 89.6% less power for signal detection in demodulation operation. On the contrary, the conventional QPSK demodulation process where it uses coherent detection technique requires the exact incoming signal frequency; thus, any variation in the frequency of the local oscillator or incoming signal will cause phase noise. A software simulation of the proposed design was successfu

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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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Koptev, D. S., and V. G. Dovbnya. "Clock synchronization method for quadrature amplitude keyed signal demodulators." Proceedings of the Southwest State University. Series: IT Management, Computer Science, Computer Engineering. Medical Equipment Engineering 15, no. 1 (2025): 35–50. https://doi.org/10.21869/2223-1536-2025-15-1-35-50.

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The purpose of the research is to develop a method for restoring clock synchronization for signals demodulators with square amplitude manipulation.Methods are based on the foundations of quasi -optimal receipt of multi -position signals, the theory of constructing radio -receiving systems of digital communication lines, methods of mathematical modeling of signals, probability theory and mathematical statistics. The well -known algorithms for assessing the phase of clusion of clusion in the presence of manipulation interference, due to a multi -level signal modulation, were used. The assumption

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Winholtz, William S. "Vocal demodulator." Journal of the Acoustical Society of America 95, no. 1 (1994): 590. http://dx.doi.org/10.1121/1.408328.

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Hima, Bindu Katikala, Ramana Murthy G, and Amarendra Nath Yatavakilla. "Design and Implementation of High Performance PPSK demodulator in Biomedical Implant." Indian Journal of Science and Technology 14, no. 34 (2021): 2742–50. https://doi.org/10.17485/IJST/v14i34.1071.

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Abstract <strong>Background/Objective:</strong> The important challenge for the realization of hearing aids is small size, low cost, low power consumption, and better performance, etc. Keeping these requirements in view this work concentrates on the VLSI (Very Large Scale Integrated) implementation of the analog circuit that mimics the PPSK (Passive Phase Shift Keying) demodulator with a low pass filter. <strong>Methodology:</strong> This research deals with RF Cochlear implant circuits and their data transmission. A PPSK modulator is used for uplink data transmission in biomedi

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Ghazi, Milad, Mohammad Hossein Maghami, Parviz Amiri, and Sotoudeh Hamedi-Hagh. "An Ultra-Low-Power Area-Efficient Non-Coherent Binary Phase-Shift Keying Demodulator for Implantable Biomedical Microsystems." Electronics 9, no. 7 (2020): 1123. http://dx.doi.org/10.3390/electronics9071123.

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A novel non-coherent, low-power, area-efficient binary phase-shift keying demodulator for wireless implantable biomedical microsystems is proposed. The received data and synchronized clock signal are detected using a delayed digitized format of the input signal. The proposed technique does not require any kind of oscillator circuit, and due to the synchronization of all circuit signals, the proposed demodulator can work in a wide range of biomedical data telemetry common frequencies in different process/temperature corners. The presented circuit has been designed and post-layout-simulated in a

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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 de

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Oota, Akihiro, Hideaki Nozato, Wataru Kokuyama, Yoshinori Kobayashi, Osamu Takano, and Naoki Kasai. "Digital demodulator unit of laser vibrometer standard for in situ measurement." ACTA IMEKO 2, no. 2 (2014): 61. http://dx.doi.org/10.21014/acta_imeko.v2i2.116.

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To establish an easy-to-use traceability system for laser vibrometers in vibration acceleration standard, a highly accurate reference standard is required. In this study, we investigated the measurement reliability of a commercial laser vibrometer with an analog demodulator. The results confirmed a large measurement deviation from nominal sensitivity values due to characteristics of the analog demodulator. To reduce such deviation, a high-accuracy digital demodulator, which can be utilized as a reference standard, was developed. The experimental results confirmed the improved measurement accur

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Purnama, Arrizky Ayu Faradila, Aloysius Adya Pramudita, and Edwar Edwar. "ANALISA PERGESERAN FASA PADA PERANCANGAN DAN REALISASI BRANCH-LINE COUPLER UNTUK DETEKSI FASA PADA RADAR C-BAND." TEKTRIKA - Jurnal Penelitian dan Pengembangan Telekomunikasi, Kendali, Komputer, Elektrik, dan Elektronika 5, no. 2 (2021): 35. http://dx.doi.org/10.25124/tektrika.v5i2.3990.

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Sejumlah radar menggunakan I/Q demodulator pada sisi penerima untuk melakukan pengolahan sinyal pantul dari objek yang diterimanya. I/Q demodulator merupakan suatu komponen yang berfungsi untuk memproses sinyal RF ke sinyal I (In-phase) dan sinyal Q (Quadrature). Pada I/Q demodulator, sinyal masukkan akan dikalikan dengan dua sinyal dari LO (Local Oscillator) yang masing-masing berbeda fasa 90 yang kemudian digunakan sebagai mekanisme pendeteksi fasa. Branch-line coupler merupakan suatu rangkaian penggeser fasa yang dapat diimplementasikan dalam membangun I/Q demodulator. Akurasi pergeseran fa

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PAVLOV, I. I., M. C. PAVLOVA, E. S. ABRAMOVA, S. S. ABRAMOV, A. KHAN, and YU S. SHCHERBAKOV. "MODIFIED INVARIANT AMPLITUDE MODULATION WITH TWO REFERENCE SIGNALS." T-Comm 17, no. 6 (2023): 13–22. http://dx.doi.org/10.36724/2072-8735-2023-17-6-13-22.

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The model of modified invariant amplitude modulation and demodulation with two reference signals considered in the article belongs to the field of systems, networks and devices of telecommunications and radio engineering and can be used in radio transmitting devices, telecommunication systems and devices where an amplitude-modulated transmitted signal is required for transmission through a communication channel. The achieved technical result of the modified invariant amplitude modulation and demodulation with two reference signals is aimed at the possibility of forming an amplitude-modulated t

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Garg, Vaibhav, and Kavindra Kandpal. "Design of DQPSK Demodulator for Implantable Biomedical Devices." Journal of Circuits, Systems and Computers 29, no. 11 (2020): 2020007. http://dx.doi.org/10.1142/s0218126620200078.

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Implantable biomedical devices (IBDs) play a vital role in today’s healthcare industry. Such applications demand high data rate, low power and small-sized demodulators. This work presents a simple small-sized low-power architecture for differential quadrature phase shift keying (DQPSK) demodulator for these devices. The proposed circuitry is designed in UMC 90-nm CMOS technology and occupies a layout area of 0.015[Formula: see text]mm2. It is operated at 1-V supply voltage with a power consumption of 405[Formula: see text][Formula: see text]W. The carrier frequency is 10[Formula: see text]MHz

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Глушков, А. Н., Ю. В. Литвиненко, Б. Н. Тишуков, and Е. В. Черноярова. "DIGITAL SIGNAL DEMODULATOR WITH AMPLITUDE-PHASE MANIPULATION." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА 19, no. 5 (2023): 115–20. http://dx.doi.org/10.36622/vstu.2023.19.5.016.

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исследуется оптимальный цифровой алгоритм когерентной демодуляции сигналов с амплитудно-фазовой манипуляцией (АФМ или APSK). Демодуляция фазы выполняется на основе фазового детектора сигналов с многопозиционной фазовой манипуляцией, а амплитуды символов определяются по откликам квадратурных каналов обработки сигнала. Проведен анализ алгоритма обработки сигнала с АФМ, рассмотрены временные реализации откликов демодулятора. Определена помехоустойчивость демодуляции для сигналов с двухуровневой АФМ для двух наиболее распространенных вариантов созвездий, оценены вероятности ошибочной демодуляции ф

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Amit Deshmukh, Alpana, Radheshyam Gamad, and Deepak Kumar Mishra. "Implementation of Phase Locked Loop for FM Demodulator Circuit." International Journal of Engineering & Technology 7, no. 4 (2019): 6519–22. http://dx.doi.org/10.14419/ijet.v7i4.28025.

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This paper aims to implement the phase locked loop for the FM demodulator circuit in Intermediate frequency band. Implementation of the proposed design is done using Simulink; further simulation is presented using Matlab as well as a comparative analysis of VCO parameters using charge pump, linearized and baseband are discussed. Charge pump based PLL design achieved phase noise of -120 dBc/Hz at 10 MHz offset frequency. Paper also presented FM demodulated output for 5000 kHz sampling frequency and 2000 KHz carrier frequency at 50 Hz deviation frequency. Simulation results are reported in tabul

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Hatai, Indranil, and Indrajit Chakrabarti. "A New High-Performance Digital FM Modulator and Demodulator for Software-Defined Radio and Its FPGA Implementation." International Journal of Reconfigurable Computing 2011 (2011): 1–10. http://dx.doi.org/10.1155/2011/342532.

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This paper deals with an FPGA implementation of a high performance FM modulator and demodulator for software defined radio (SDR) system. The individual component of proposed FM modulator and demodulator has been optimized in such a way that the overall design consists of a high-speed, area optimized and low-power features. The modulator and demodulator contain an optimized direct digital frequency synthesizer (DDFS) based on quarter-wave symmetry technique for generating the carrier frequency with spurious free dynamic range (SFDR) of more than 64 dB. The FM modulator uses pipelined version of

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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) demodu

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Song, Jin-Hyuk, Myung-Sun Baek, Byungjun Bae, and Hyoung-Kyu Song. "A Deep Learning-Based Emergency Alert Wake-Up Signal Detection Method for the UHD Broadcasting System." Sensors 24, no. 13 (2024): 4162. http://dx.doi.org/10.3390/s24134162.

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With the increasing frequency and severity of disasters and accidents, there is a growing need for efficient emergency alert systems. The ultra-high definition (UHD) broadcasting service based on Advanced Television Systems Committee (ATSC) 3.0, a leading terrestrial digital broadcasting system, offers such capabilities, including a wake-up function for minimizing damage through early alerts. In case of a disaster situation, the emergency alert wake-up signal is transmitted, allowing UHD TVs to be activated, enabling individuals to receive emergency alerts and access emergency broadcasting con

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