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Journal articles on the topic 'Quadrature demodulation'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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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 technology and hybrid circuits. Experimental results indicate that the developed quadrature-tracking demodulator, which operates at 2.1~2.5 GHz, can effectively demodulate an 18 Mbps LTE-A signal, even with a 15 degree quadrature imbalance.

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2

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 successfully carried out using MATLAB Simulink software platform. In the conventional system, at least 10 dB signal to noise ratio (SNR) is required to achieve the bit error rate (BER) of 10−6, whereas, in the proposed technique, the same BER value can be achieved with only 5 dB SNR. Since some of the power consuming elements such as voltage control oscillator (VCO), mixer, and low pass filter (LPF) are no longer needed, the proposed QPSK demodulator will consume almost 68.8% to 99.6% less operational power compared to conventional QPSK demodulator.

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3

Ho, K. C., Y. T. Chan, and R. Inkol. "A digital quadrature demodulation system." IEEE Transactions on Aerospace and Electronic Systems 32, no. 4 (1996): 1218–27. http://dx.doi.org/10.1109/7.543843.

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4

Kulikov, G. V., and A. A. Lelyukh. "Influence of amplitude and phase imbalance of quadratures on the noise immunity of coherent reception of signals with quadrature amplitude modulation." Russian Technological Journal 9, no. 1 (March 3, 2021): 29–37. http://dx.doi.org/10.32362/2500-316x-2021-9-1-29-37.

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Quadrature amplitude modulation (QAM) is used for high-speed information transmission in many radio systems and, in particular, in DVB-S and DVB-S2/S2X digital satellite television systems. A receiver included as a part of the transmitting equipment of such systems has a block for the formation of quadrature oscillations used as a reference for signal demodulation. Due to hardware instabilities, amplitude and phase errors may occur, which leads to quadratures imbalance. These inaccuracies cause additional errors in the received signal demodulation. This can significantly degrade the noise immunity of the reception. The paper investigates the influence of amplitude and phase errors in the formation of quadrature oscillations (imbalance of quadratures) on the noise immunity of coherent reception of QAM signals. Using the methods of statistical radio engineering the parameters of the distributions of processes in the receiver are obtained, and the probability of a bit error is estimated. The dependences of the bit error probability on the amplitude unbalance factor, on the phase error of quadrature formation and on signal-to-noise ratio are obtained. It is shown that the amplitude imbalance of the quadratures leads to a significant decrease in the noise immunity of QAM signals reception at M ≥ 16. The acceptable amplitude deviation in this case can be considered to be equal to 5%. At M= 4, the amplitude imbalance in a wide range of values practically does not affect the noise immunity. The phase imbalance of quadratures markedly affects the noise immunity of coherent reception of QAM signals. The permissible phase error is no more than 0.05 rad (3 degrees). As the signals positionality increases, this influence also increases.

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5

Jeong, YeonKeun, Woojin Seo, and Kwang Ryul Baek. "Implementation of Ultrasonic Flow Meter System with Quadrature Demodulation." Journal of Institute of Control, Robotics and Systems 24, no. 8 (August 31, 2018): 777–83. http://dx.doi.org/10.5302/j.icros.2018.0080.

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6

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 (October 1, 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 with the influence of phase locking errors have been tested. The introduced demodulator can be implemented either as a device independent from the programmable logic devices, or as an installation unit of the receiver equipment.

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7

Gao, Xiao Peng, Si Yuan Wang, and Han Wan. "Accelerate Demodulation of Quadrature Amplitude Modulation Using GPU." Applied Mechanics and Materials 325-326 (June 2013): 907–11. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.907.

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Quadrature amplitude modulation (QAM) is widely used in communication systems. The traditional QAM demodulation method was implemented in hardware. This paper proposes a demodulation algorithm using GPU. The GPU algorithm is easier to add new features than hardware implementation and reaches 57x speed up compared with the serial algorithm on CPU. It is shown that the QAM demodulation algorithm gained significant performance increase due to the natural parallism of the GPU, using Compute Unified Device Architecture (CUDA).

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8

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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9

Chen, Hua, and Yanqing Zhong. "Design of Readout Circuit with Quadrature Error and Auxiliary PLL for MEMS Vibratory Gyroscope." Sensors 20, no. 16 (August 14, 2020): 4564. http://dx.doi.org/10.3390/s20164564.

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Traditional MEMS gyroscope readout eliminates quadrature error and relies on the phase relationship between the drive displacement and the Coriolis position to accomplish a coherent demodulation. This scheme shows some risk, especially for a mode-matching gyro. If only a slight resonant frequency deviation between the drive and sense mode occurs, a dramatic change in the phase relationship follows, which leads to a wrong demodulation. To solve this, this paper proposes a new readout based on the quadrature error and an auxiliary phase-locked loop (PLL). By tuning the phase shifter in the sense-mode circuit, letting the quadrature error and the carrier of the mixer be in 90° phase alignment, the Coriolis was simultaneously in phase with the carrier. Hence, the demodulation was accomplished. The carrier comes from the PLL output of the drive-mode circuit due to its low jitter and independence of the work mode of the gyro. Moreover, an auxiliary PLL is used to filter the quadrature error to enhance the phase alignment accuracy. Through an elaborate design, a printed circuit board was used to verify the proposed idea. The experimental results show the readout circuit functioned well. The scale factor of the gyro was 6.8 mV/°/s, and the bias instability was 204°/h.

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10

Corbella, Ignasi, Manuel Martín Neira, Roger Vilaseca, Albert Catalan, Francesc Torres, and Martin Suess. "A Novel Digital IQ Demodulation for Interferometric Radiometers." Remote Sensing 13, no. 6 (March 18, 2021): 1156. http://dx.doi.org/10.3390/rs13061156.

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In the frame of an SMOS follow-on operational mission, a new instrument design is being developed based on the lessons learned from MIRAS, the SMOS payload. To reduce hardware complexity and mass, digital In-phase Quadrature (IQ) demodulation is considered. In this schema, Q components are obtained by delaying one clock of the digitized IF signals instead of using phase quadrature analog mixers. The purpose of this article is to formulate this concept for application to interferometric radiometry, establish the required data processing methods, and provide experimental results.

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11

Yin, Tao, Yueshan Lin, Haigang Yang, and Huanming Wu. "A Phase Self-Correction Method for Bias Temperature Drift Suppression of MEMS Gyroscopes." Journal of Circuits, Systems and Computers 29, no. 12 (February 26, 2020): 2050198. http://dx.doi.org/10.1142/s0218126620501984.

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Phase error of the demodulation clock in the Coriolis vibratory gyroscope system allows the quadrature errors to leak into the sense channel and causes significant bias and temperature drift at the rate output. A phase self-correction method to suppress the temperature drift of the bias in gyroscopes is proposed. Through sweeping the demodulation clock phase and simultaneously monitoring the mechanical quadrature error output in gyroscopes, the optimal demodulation clock phase with minimum relatively phase shift is determined. Thus the bias influenced by the temperature and surroundings can be calibrated on-chip at start-up or when the environment changes drastically without the requirement of the complicated instruments. The proposed approach is validated by a silicon MEMS gyroscope with the natural frequency of 2.8[Formula: see text]kHz, which shows nearly 22 times improvement in the temperature sensitivity of the system bias, from 550[Formula: see text]mdeg/s/∘C down to 24.7[Formula: see text]mdeg/s/∘C.

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12

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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13

Inkol, R. J., R. H. Saper, and M. Herzig. "Design of digital filters for precision quadrature demodulation." IEE Proceedings - Vision, Image, and Signal Processing 143, no. 2 (1996): 73. http://dx.doi.org/10.1049/ip-vis:19960239.

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14

Rao, G. Nagendra. "Quadrature Demodulation of Binary Phase Shift Keyed Signals." IETE Journal of Education 29, no. 3 (July 1988): 87–90. http://dx.doi.org/10.1080/09747338.1988.11436203.

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15

Angrisani, L., and R. Schiano Lo Moriello. "Estimating ultrasonic time-of-flight through quadrature demodulation." IEEE Transactions on Instrumentation and Measurement 55, no. 1 (February 2006): 54–62. http://dx.doi.org/10.1109/tim.2005.861251.

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16

Waller, J., X. H. Shi, N. C. Altoveros, J. Howard, B. D. Blackwell, and G. B. Warr. "Digital interface for quadrature demodulation of interferometer signalsa)." Review of Scientific Instruments 66, no. 2 (February 1995): 1171–74. http://dx.doi.org/10.1063/1.1146000.

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17

Czarske, J., and O. Dölle. "Quadrature demodulation technique used in laser Doppler velocimetry." Electronics Letters 34, no. 6 (1998): 547. http://dx.doi.org/10.1049/el:19980389.

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18

Wang, Chunhui, Yang Qu, and Yajun Pang Tiantian Tang. "IQ quadrature demodulation algorithm used in heterodyne detection." Infrared Physics & Technology 72 (September 2015): 191–94. http://dx.doi.org/10.1016/j.infrared.2015.08.003.

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19

Kistanova, V. A., and V. I. Oganov. "Phase control algorithm for demodulation of binary phase-shift keying signals." Radio industry 28, no. 4 (November 27, 2018): 15–20. http://dx.doi.org/10.21778/2413-9599-2018-28-4-15-20.

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The purpose of this paper is to synthesize an algorithm for coherent digital demodulation of non-uniformly distributed radio signals with absolute two-position phase shift keying, which has a small computational complexity, and to develop a miniature low-power demodulator on its basis. The relevance of the study is determined by the absence of similar devices in the Russian radio electronic market. The algorithm is based on digital phase-locked-loop frequency control. Its basic idea is to retain the optimal amplitude ratio between the phase quadrature of the received signal using a proportional-integral- differential controller. A digital device with the stated technical characteristics was obtained as a result of the study.

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20

Fu, Haijin, Ruidong Ji, Pengcheng Hu, Yue Wang, Guolong Wu, and Jiubin Tan. "Measurement Method for Nonlinearity in Heterodyne Laser Interferometers Based on Double-Channel Quadrature Demodulation." Sensors 18, no. 9 (August 22, 2018): 2768. http://dx.doi.org/10.3390/s18092768.

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The phase quadrature measurement method is capable of measuring nonlinearity in heterodyne laser interferometers with picometer accuracy whereas it cannot be applied in the new kind of heterodyne interferometers with bidirectional Doppler frequency shift especially in the condition of non-uniform motion of the target. To solve this problem, a novel measurement method of nonlinearity is proposed in this paper. By employing double-channel quadrature demodulation and substituting the external reference signal with internal ones, this method is free from the type of heterodyne laser interferometer and the motion state of the target. For phase demodulation, the phase differential algorithm is utilized to improve the computing efficiency. Experimental verification is carried out and the results indicate that the proposed measurement method achieves accuracy better than 2 pm.

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21

Chen, Dan Hua, Li Chen, Hui Zhou, and Ying Tian. "High-Precision Quadrature Signal Generator for Digital Demodulation of MEMS Gyroscope." Key Engineering Materials 645-646 (May 2015): 561–65. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.561.

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A new quadrature signal generator based on Direct Digital Synthesis (DDS) algorithm for digital demodulation of MEMS gyroscope was proposed in this paper. To avoid quantization error, the dual-accumulator with signal-ROM structure was adopted. This signal generator was realized in FPGA chip, which could be quit compact to realize all digital demodulation in one chip. Simulations and tests of the generator were carried out. The test results demonstrate that the signal generator achieves high stability. The standard deviation of the frequency is 0.075Hz and the standard deviation of the amplitude is 0.037mV.

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22

Zhou, Jun Peng, Ren Shan Pang, Gui Fu Yang, Hai Xia Chen, and Lian Ming Wang. "Research on the Quadrature Demodulation-Based Quartz Crystal Microbalance Implementation Method." Applied Mechanics and Materials 620 (August 2014): 214–18. http://dx.doi.org/10.4028/www.scientific.net/amm.620.214.

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In order to overcome the shortcomings of traditional quartz crystal microbalance (QCM) network measuring method, such as high requirements for hardware devices, low measurement speed and high challenge to curve fitting, a method based on the Quadrature Demodulation was proposed to design a rapid and accurate measuring system for QCM parameters, which mainly took the advantages of Quadrature Demodulation to remove the intermediate frequency component while reserve the low frequency component. Furthermore, the effectiveness of this method was proved by contrasting the Matlab simulation results with the actual measurement results based on the modified measuring system, which indicated that the frequency resolution could reach 0.1Hz with high testing speed of 0.02s per cycle, the relative deviations of resonance frequencies were less than 0.01% and the deviation of the differences between series and parallel resonant frequency points was 0.38%.

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23

Guo, Dongmei. "Quadrature demodulation technique for self-mixing interferometry displacement sensor." Optics Communications 284, no. 24 (December 2011): 5766–69. http://dx.doi.org/10.1016/j.optcom.2011.08.027.

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24

Ying, Diqing, Qiang Liu, Zeyu Wang, Tao Xie, and Zhonghe Jin. "Closed-loop RFOG based on square wave quadrature demodulation." Optics Communications 493 (August 2021): 127015. http://dx.doi.org/10.1016/j.optcom.2021.127015.

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25

DAM, B., K. BANERJEE, K. MAJUMDAR, R. BANERJEE, and D. PATRANABIS. "A ZERO PHASE-LAG HOMODYNE DEMODULATION TECHNIQUE FOR SYNCHRONOUS MEASUREMENT APPLICATIONS AND ITS FPGA IMPLEMENTATION." Journal of Circuits, Systems and Computers 14, no. 04 (August 2005): 771–91. http://dx.doi.org/10.1142/s0218126605002593.

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A simple homodyne direct digital demodulation technique that is insensitive to sensor induced phase-error and its innovative FPGA implementation are presented here. This novel demodulation scheme does not need a low pass filter; thereby the inherent filter time lag is eliminated. A direct digital read-out of the demodulated signal, i.e., the measurand value, is obtained through analog-to-digital conversion of the modulated signal at an instant that coincides with its peak. This peak sampling eliminates the processor time required in quadrature demodulators to obtain the measurand from the in-phase and quadrature components. For this purpose a quadrature square wave is first generated from the reference carrier. Digital measures of carrier time period and sensor induced time lag/lead are used to ensure that the rising edges of this quadrature square wave coincide with the peak instants of the modulated signal. The required sampling instants for digitization of the modulated signal are generated in synchronism with its rising edges. The digital read-out of the measurand is directly obtained without taking recourse to the standard sequence of multiplication, low-pass filtering and the subsequent processing common in existing synchronous phase-sensitive demodulators. With an a priori knowledge of the sensor-type used, this innovative FPGA-based implementation accommodates sensors introducing lagging or leading phase-shift in the modulated carrier.

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26

Wang, Zinan, Yi Yang, Yongxiao Li, Xiaoqi Yu, Zhenrong Zhang, and Zhengbin Li. "Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes." Optics Express 20, no. 23 (October 25, 2012): 25421. http://dx.doi.org/10.1364/oe.20.025421.

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27

Hodgkinson, T. G., R. A. Harmon, and D. W. Smith. "Demodulation of optical DPSK using in-phase and quadrature detection." Electronics Letters 21, no. 19 (1985): 867. http://dx.doi.org/10.1049/el:19850612.

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28

Toda, Kohji, and Koichi Mizutani. "A lamb wave device for quadrature-PSK modulation and demodulation." Electronics and Communications in Japan (Part II: Electronics) 71, no. 8 (1988): 62–70. http://dx.doi.org/10.1002/ecjb.4420710807.

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29

Liu, Guigen, Yupeng Zhu, Qiwen Sheng, and Ming Han. "Polarization-insensitive, omnidirectional fiber-optic ultrasonic sensor with quadrature demodulation." Optics Letters 45, no. 15 (July 20, 2020): 4164. http://dx.doi.org/10.1364/ol.397955.

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30

Dezhi Zheng, Shaobo Zhang, Shuai Wang, Chun Hu, and Xiaomeng Zhao. "A Capacitive Rotary Encoder Based on Quadrature Modulation and Demodulation." IEEE Transactions on Instrumentation and Measurement 64, no. 1 (January 2015): 143–53. http://dx.doi.org/10.1109/tim.2014.2328456.

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31

Waller, J., X. H. Shi, N. C. Altoveros, J. Howard, B. D. Blackwell, and G. B. Warr. "Digital interface for quadrature demodulation of interferometer signals (abstract)a)." Review of Scientific Instruments 66, no. 1 (January 1995): 522. http://dx.doi.org/10.1063/1.1146485.

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32

Wang, Feixue, Shaowei Yong, and Guirong Guo. "Mixer-free digital quadrature demodulation based on second-order sampling." Electronics Letters 34, no. 9 (1998): 854. http://dx.doi.org/10.1049/el:19980149.

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33

Ortlepp, Ingo, Eberhard Manske, Jens-Peter Zöllner, and Ivo W. Rangelow. "Phase-Modulated Standing Wave Interferometer." Proceedings 56, no. 1 (December 10, 2020): 12. http://dx.doi.org/10.3390/proceedings2020056012.

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Standing wave interferometers (SWIs) show enormous potential for miniaturization because of their simple linear optical set-up, consisting only of a laser source, a measuring mirror and two standing wave sensors for obtaining quadrature signals. To reduce optical influences on the standing wave and avoid the need for an exact and long-term stable sensor-to-sensor distance, a single-sensor set-up was developed with a phase modulation by forced oscillation of the measuring mirror. When the correct modulation stroke is applied, the harmonics in the sensor signal can be used for obtaining quadrature signals for phase demodulation and direction discrimination.

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34

Rohwetter, Philipp, Rene Eisermann, and Katerina Krebber. "Random Quadrature Demodulation for Direct Detection Single-Pulse Rayleigh C-OTDR." Journal of Lightwave Technology 34, no. 19 (October 1, 2016): 4437–44. http://dx.doi.org/10.1109/jlt.2016.2557586.

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35

Feng, Naizhang, Jianqiu Zhang, and Weiqi Wang. "A quadrature demodulation method based on tracking the ultrasound echo frequency." Ultrasonics 44 (December 2006): e47-e50. http://dx.doi.org/10.1016/j.ultras.2006.06.037.

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36

Zhang, Bin, Yuanhang Qu, and Min Chen. "Simulation and Performance Study of Quadrature Amplitude Modulation and Demodulation System." IOP Conference Series: Materials Science and Engineering 782 (April 15, 2020): 042048. http://dx.doi.org/10.1088/1757-899x/782/4/042048.

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37

Müller, H., V. Strunck, and D. Dopheide. "The application of quadrature demodulation techniques for the investigation of flows." Flow Measurement and Instrumentation 7, no. 3-4 (September 1996): 237–45. http://dx.doi.org/10.1016/s0955-5986(97)00008-3.

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38

Servin, Manuel, Juan Antonio Quiroga, and Jose Luis Marroquin. "General n-dimensional quadrature transform and its application to interferogram demodulation." Journal of the Optical Society of America A 20, no. 5 (May 1, 2003): 925. http://dx.doi.org/10.1364/josaa.20.000925.

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39

Jiang, Yi, Caijie Tang, and Guirong Guo. "Note: Phase compensation in the fiber optical quadrature passive demodulation scheme." Review of Scientific Instruments 81, no. 4 (April 2010): 046108. http://dx.doi.org/10.1063/1.3397255.

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40

Lee, Da-Young, Yangmo Yoo, Tai-Kyong Song, and Jin Ho Chang. "Adaptive dynamic quadrature demodulation with autoregressive spectral estimation in ultrasound imaging." Biomedical Signal Processing and Control 7, no. 4 (July 2012): 371–78. http://dx.doi.org/10.1016/j.bspc.2011.06.010.

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41

Ren, Baokai, Jin Cheng, Longjiang Zhao, Zhenghou Zhu, Xiaoping Zou, Lei Qin, and Yifei Wang. "Research on the Frequency Response and Dynamic Range of the Quadrature Fiber Optic Fabry–Perot Cavity Microphone Based on the Differential Cross Multiplication Demodulation Algorithm." Sensors 21, no. 18 (September 14, 2021): 6152. http://dx.doi.org/10.3390/s21186152.

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A quadrature fiber optic Fabry–Perot cavity microphone based on a differential cross multiplication algorithm consists of a pair of fibers and a membrane. It has many advantages such as high sensitivity, a simple structure, and resistance to electromagnetic interference. However, there are no systematic studies on its key performance, for example, its frequency response and dynamic range. In this paper, a comprehensive study of these two key parameters is carried out using simulation analysis and experimental verification. The upper limit of the frequency response range and the upper limit of the dynamic range influence each other, and they are both affected by the data sampling rate. At a certain data sampling rate, the higher the upper limit of the frequency response range is the lower the upper limit of the dynamic range. The quantitative relationship between them is revealed. In addition, these two key parameters also are affected by the quadrature phase deviation. The quadrature phase deviation should not exceed 0.25π under the condition that the demodulated signal intensity is not attenuated by more than 3 dB. Subsequently, a short-step quadrature Fabry–Perot cavity method is proposed, which can suppress the quadrature phase deviation of the quadrature fiber optic Fabry–Perot cavity microphone based on the differential cross multiplication algorithm.

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42

Ito, Shinya, Mitoshi Fujimoto, Toshikazu Hori, Tomohisa Harada, and Yoshiyuki Hattori. "Noise Suppression System for AM Signal using Quadrature Demodulation and PI Algorithm." IEEJ Transactions on Fundamentals and Materials 136, no. 6 (2016): 330–35. http://dx.doi.org/10.1541/ieejfms.136.330.

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43

Ho, H. P., K. C. Lo, Y. Chan, R. K. Y. Li, and C. M. L. Wu. "Application of passive quadrature phase demodulation for the detection of laser ultrasound." Optics and Lasers in Engineering 38, no. 6 (December 2002): 549–56. http://dx.doi.org/10.1016/s0143-8166(02)00035-0.

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Ikeda, Toshio, Masami Furusawa, and Kohji Toda. "Quadrature Phase Shift Keying Modulation and Demodulation System Using Rayleigh Wave Devices." Japanese Journal of Applied Physics 29, S1 (January 1, 1990): 151. http://dx.doi.org/10.7567/jjaps.29s1.151.

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JIN Zhong-xie, 金钟燮, and 崔海军 CUI Hai-jun. "Mach-Zehnder Interferometer Based Wavelength Demodulation System by Using Quadrature Signal Processing." ACTA PHOTONICA SINICA 39, s1 (2010): 67–71. http://dx.doi.org/10.3788/gzxb201039s1.0067.

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Wang, Xiufang, Zhuo Xiang, Bingkun Gao, and Chunlei Jiang. "Multiple self-mixing interferometry for displacement measurement based on quadrature demodulation technique." Optical Engineering 55, no. 12 (December 29, 2016): 126116. http://dx.doi.org/10.1117/1.oe.55.12.126116.

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Park, Byung-Kwon, Olga Boric-Lubecke, and Victor M. Lubecke. "Arctangent Demodulation With DC Offset Compensation in Quadrature Doppler Radar Receiver Systems." IEEE Transactions on Microwave Theory and Techniques 55, no. 5 (May 2007): 1073–79. http://dx.doi.org/10.1109/tmtt.2007.895653.

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Moody, Galan, Corey McDonald, Ari Feldman, Todd Harvey, Richard P. Mirin, and Kevin L. Silverman. "Quadrature demodulation of a quantum dot optical response to faint light fields." Optica 3, no. 12 (November 17, 2016): 1397. http://dx.doi.org/10.1364/optica.3.001397.

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Wu, Chuanbin, Yi Lin, Xiaojun Jin, Huilian Ma, and Zhonghe Jin. "Synchronous in-phase and quadrature demodulation technique for resonant micro-optic gyroscope." Applied Optics 58, no. 18 (June 19, 2019): 5050. http://dx.doi.org/10.1364/ao.58.005050.

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Al-Rawi, Muhanned. "Data-Aided Carrier Recovery with QPSK Modulation." Scientific Bulletin 24, no. 1 (June 1, 2019): 14–22. http://dx.doi.org/10.2478/bsaft-2019-0002.

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Abstract:

Abstract Digital communication has proven to be the most efficient method of data transmission especially where long distances are involved. This led to the invention of more sophisticated methods of communication ranging from mobile handset communication to more advanced satellite communication. The speeds of passing information have been improving over the years and real time video communication has been made possible with digital devices. Various methods of digital data transmission are employed based on the information to be transmitted. This paper focuses on carrier recovery in digital communication systems, especially those based on Quadrature Phase Shift Keying (QPSK) modulation and demodulation scheme. The design being implemented is that of coherent demodulation for QPSK scheme using SIMULINK design tool. Performance of QPSK is also investigated to make a comparison and the suitability of the scheme to use in digital data transmission applications.

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