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Journal articles on the topic 'QPSK demodulator'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

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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2

Sadchenko, Andrey, and Oleg Kushnirenko. "QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane." Electrical, Control and Communication Engineering 14, no. 2 (December 1, 2018): 149–56. http://dx.doi.org/10.2478/ecce-2018-0018.

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AbstractIn order to increase the efficiency of dedicated frequency channels, i.e. to increase the specific data transfer rate, multipositional quadrature phase shift keying (QPSK, aka 4-PSK) should be used. The problems with QPSK signal demodulation is a rotation of the signal constellation plane by an angle multiple of 90° and a slow response of the carrier oscillation recovery scheme. The study considers the existing methods for eliminating the phase ambiguity of the recovered carrier frequency in typical QPSK modems, and identifies the shortcoming of a low-speed response oscillation recovery circuit. The authors propose a QPSK demodulator circuit with a fast adjustment of the reference oscillator, which is due to the fact that no loop filter is used in the feedback and that a digital calculator of the required phase shift is used. An algorithm for the frame synchronization restoration with the simultaneous elimination of the phase ambiguity multiple of 90° was also developed using synthesized binary sequences with an ideal non-periodic autocorrelation function (NACF) at even shifts that do not have the rotary symmetry property. The phase ambiguity elimination algorithm proposed in the article can be used as an alternative to standard modems with differential coding.

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3

Shehab, Maisoon, Ibrahim Saber, Mustafa Eltokhy, Fathy Amer, and Zaki Nossair. "Development of QPSK Demodulator using DSP Techniques." Engineering Research Journal 163 (September 1, 2019): 1–15. http://dx.doi.org/10.21608/erj.2019.114093.

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4

Kim, D., M. Ko, K. C. Choi, and W. Y. Choi. "Mixed-mode QPSK demodulator for home networking applications." Electronics Letters 47, no. 2 (2011): 92. http://dx.doi.org/10.1049/el.2010.2656.

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5

Zhu, Jin, Qiu Xu, and Dan Dan Yan. "Design of QPSK Modem Based on FPGA." Applied Mechanics and Materials 427-429 (September 2013): 884–87. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.884.

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Quadrature Phase Shift Keying as a efficient modulation mode to be used in wireless communication. it is significant to study its implement. This paper presents a method to design QPSK modulator and demodulator, which use field programmable gate array. We will analysis the principle of QPSK modem and will give the design method, display the block diagram of the system in this paper and discuss its feasibility. The whole system is divided into several small models. Because space is limited, we can only introduce some key modules. Such as carrier recover and bit synchronization

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6

Trambarulo, R., M. Schneider, and M. J. Gans. "High-speed QPSK modulator and demodulator with subharmonic pumping." IEEE Transactions on Microwave Theory and Techniques 36, no. 12 (December 1988): 1714–19. http://dx.doi.org/10.1109/22.17404.

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7

Chen, Fei, Ryan Bespalko, and Brian M. Frank. "A CMOS QPSK demodulator frontend for a PON ONU." Microwave and Optical Technology Letters 53, no. 5 (March 21, 2011): 1056–62. http://dx.doi.org/10.1002/mop.25902.

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8

Van der Wal, R., and L. Montreuil. "QPSK and BPSK demodulator chip-set for satellite applications." IEEE Transactions on Consumer Electronics 41, no. 1 (1995): 30–41. http://dx.doi.org/10.1109/30.370307.

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9

Hamed, K. W., A. P. Freundorfer, Y. M. M. Antar, P. Frank, and D. Sawatzky. "A High-Bit Rate Ka-Band Direct Conversion $QPSK$ Demodulator." IEEE Microwave and Wireless Components Letters 18, no. 5 (May 2008): 365–67. http://dx.doi.org/10.1109/lmwc.2008.922134.

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10

Cao, YuXiong, DanYu Wu, XinYu Liu, and Zhi Jin. "Broad-band direct QPSK modulator/demodulator for wireless gigabit communication." Chinese Science Bulletin 58, no. 3 (January 2013): 427–32. http://dx.doi.org/10.1007/s11434-012-5566-4.

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11

Ulusoy, Ahmet Çağrı, and Hermann Schumacher. "Multi-Gb/s Analog Synchronous QPSK Demodulator With Phase-Noise Suppression." IEEE Transactions on Microwave Theory and Techniques 60, no. 11 (November 2012): 3591–98. http://dx.doi.org/10.1109/tmtt.2012.2216894.

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12

Lee, Han Lim, Seong‐Mo Moon, Moon‐Que Lee, and Jong Won Yu. "Six‐port QPSK demodulator for optimal K‐band multiport amplifier calibration." Electronics Letters 50, no. 8 (April 2014): 617–18. http://dx.doi.org/10.1049/el.2013.4147.

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13

Moon, Seong-Mo, Dong-Hoon Park, Jong-Won Yu, and Moon-Que Lee. "Design of QPSK Demodulator Using CMOS BPSK Receiver and Reflection-Type Phase Shifter." Journal of Korean Institute of Electromagnetic Engineering and Science 20, no. 8 (August 31, 2009): 770–76. http://dx.doi.org/10.5515/kjkiees.2009.20.8.770.

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14

Xiang, Lei, Yameng Xu, Yu Yu, and Xinliang Zhang. "An Ultracompact DP-QPSK Demodulator Based on Multimode Interference and Photonic Crystals." Journal of Lightwave Technology 30, no. 11 (June 2012): 1595–601. http://dx.doi.org/10.1109/jlt.2012.2188277.

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15

Pamungkas, Wahyu, Anggun Fitrian Isnawati, and Adi Kurniawan. "Modulasi Digital Menggunakan Matlab." JURNAL INFOTEL - Informatika Telekomunikasi Elektronika 4, no. 2 (November 10, 2012): 1. http://dx.doi.org/10.20895/infotel.v4i2.102.

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In telecommunication systems, the determination of the modulation system is an important method in the process of sending information from transmitter to receiver. In the simulation that is done using QPSK modulation system (Quadrature Phase Shift Keying), 8-QAM (Quadrature Amplitude Modulation), 16-QAM (16-Quadrature Amplitude Modulation) that uses AWGN (Additive White Gaussian Noise) channel in the transmission system uses MATLAB software. The execution of the simulation is aimed to describe how the characteristics of the waveform of each block of the modulator, to add noise in the AWGN channel and demodulator. Performance of modulation system testing is used BER (bit error ratio) method. Looking of the faults of comparison bits results of before and after the transmitted bits by using Monte Carlo simulation model. Testing on this simulation using the input data as much as 10.000 data symbols randomly and the level of Eb/No that is various for each modulation used. Performance results BER with the level of Eb / No at 1 dB of the simulated system modulation on the BER values obtained for QPSK 0.0570, 8-QAM at 0.1085 while the 16-QAM at 0.1582 and then the performance of QPSK modulation is the best. If the Eb / No is increased to 8 dB then the becomes BER QPSK smaller modulation is equal to 0.00035, the 8-QAM BER obtained at 0.0076, while the 16-QAM modulation to be 0.0139

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16

Lakhdhar,, S., F. Harabi, and A. Gharsallah. "QPSK Demodulator based on a New Half Mode Substrate Integrated Waveguide Six-port Junction." Indian Journal of Science and Technology 12, no. 28 (July 1, 2019): 1–7. http://dx.doi.org/10.17485/ijst/2019/v12i28/140839.

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17

Carpenter, Sona, Zhongxia Simon He, and Herbert Zirath. "Multi-functional D-bandI/Qmodulator/demodulator MMICs in SiGe BiCMOS technology." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (April 3, 2018): 596–604. http://dx.doi.org/10.1017/s1759078718000338.

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AbstractThis paper presents the design and characterization of a D-band (110–170 GHz) monolithic microwave integrated direct carrier quadrature modulator and demodulator circuits with on-chip quadrature local oscillator (LO) phase shifter and radio frequency (RF) balun fabricated in a 130 nm SiGe BiCMOS process withft/fmaxof 250 GHz/400 GHz. These circuits are suitable for low-power ultra-high-speed wireless communication and can be used in both homodyne and heterodyne architectures. In single-sideband operation, the modulator demonstrates a maximum conversion gain of 9.8 dB with 3-dB RF bandwidth of 33 GHz (from 119 GHz to 152 GHz). The measured image rejection ratio (IRR) and LO suppression are 19 dB and 31 dB, respectively. The outputP1dBis −4 dBm at 140 GHz RF and 1 GHz intermediate frequency (IF) and the chip consumes 53 mW dc power. The demodulator, characterized as an image reject mixer, exhibits 10 dB conversion gain with 23-dB IRR. The measured 3-dB RF bandwidth is 36 GHz and the IF bandwidth is 18 GHz. The active area of both the chips is 620 µm × 480 µm including the RF and LO baluns. A 12-Gbit/s QPSK data transmission using 131-GHz carrier signal is demonstrated on modulator with measured modulator-to-receiver error vector magnitude of 21%.

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18

Song, Ho-Jin, Jae-Young Kim, Katsuhiro Ajito, Naoya Kukutsu, and Makoto Yaita. "50-Gb/s Direct Conversion QPSK Modulator and Demodulator MMICs for Terahertz Communications at 300 GHz." IEEE Transactions on Microwave Theory and Techniques 62, no. 3 (March 2014): 600–609. http://dx.doi.org/10.1109/tmtt.2014.2300844.

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19

Moon, S. M., J. W. Yu, and M. Q. Lee. "Direct QPSK demodulator using CMOS four-port BPSK receiver in conjunction with sequentially toggled LO phase." Electronics Letters 45, no. 24 (2009): 1244. http://dx.doi.org/10.1049/el.2009.2265.

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20

Ko, Min-Su, Du-Ho Kim, Holger Rucker, and Woo-Young Choi. "3-Gb/s 60-GHz Link With SiGe BiCMOS Receiver Front-End and CMOS Mixed-Mode QPSK Demodulator." JSTS:Journal of Semiconductor Technology and Science 11, no. 4 (December 31, 2011): 256–61. http://dx.doi.org/10.5573/jsts.2011.11.4.256.

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21

Fitz, M. P. "A bit error probability analysis of a digital PLL based demodulator of differentially encoded BPSK and QPSK modulation." IEEE Transactions on Communications 42, no. 1 (1994): 17–21. http://dx.doi.org/10.1109/26.275295.

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22

Junior, Sérgio Bimbi, Vitor Chaves de Oliveira, and Gunnar Bedicks Junior. "Software Defined Radio Implementation of a QPSK Modulator/Demodulator in an Extensive Hardware Platform Based on FPGAs Xilinx ZYNQ." Journal of Computer Science 11, no. 4 (April 1, 2015): 598–611. http://dx.doi.org/10.3844/jcssp.2015.598.611.

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23

IIJIMA, YASUYUKI, SHIGEYUKI INOUE, TOMOKO KASHIMA, ATSUSHI FUKASAWA, and YUMI TAKIZAWA. "COHERENT SS DEMODULATION WITH ESTIMATION AND COMPENSATION OF PHASE ROTATION USING A PILOT CHANNEL." Journal of Circuits, Systems and Computers 13, no. 02 (April 2004): 361–73. http://dx.doi.org/10.1142/s0218126604001350.

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This paper describes and clarifies a configuration and its performance of estimation and compensation of phase rotation in radio propagation using a pilot channel for the SS (spread spectrum) modulation and demodulation. Coherent radio transmission scheme is composed as follows: (i) Continuous pilot signal is transmitted through a pilot channel, (ii) the pilot channel is composed of O-QPSK and QPSK for reverse and forward links, respectively, (iii) pilot signal is added in each I channel of O-QPSK and QPSK, and (iv) coherent demodulation is achieved by estimation and compensation of phase rotation using the pilot channel. Phase rotation and its linearity has been estimated for QPSK and O-QPSK data modulation methods. The constellation on the complex plane is used for the evaluation of phase rotation and the Eye pattern for the demodulated waveforms. The bit-error-rate (BER) versus Eb/N0 is used for the characteristics of data modulation/demodulation and SS modulation/demodulation of the proposed radio system. A proposed scheme proved that (i) estimation of rapid phase rotation caused by multipath radio propagation with high-speed Doppler shift in frequency is well realized by the use of continuous pilot transmission (pilot channel), (ii) compensation of rapid phase rotation is well done by simplified logic operations, and (iii) high performance for high speed data transmission is realized by coherent demodulation. This system will be applied to wireless LANs with high performances and simplified configurations.

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24

Lei, Dong Ming, Ping Li, and Nian Yu Zou. "4PSK Signal Based on FPGA." Advanced Materials Research 694-697 (May 2013): 2870–73. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2870.

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Based on the traditional demodulation method of four phase shift keying (QPSK), a QPSK demodulation model was proposed. The FPGA-based QPSK modulation and demodulation system and circuit had been achieved. In Xilinx ISE12.3 development environment, using the SPARTAN-3E development board, the simulation results demonstrate the feasibility of this design.

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25

Zhou, Fan, Xin Xin Geng, and Xiao Yu Zhang. "An Improved QPSK Signal's Algorithm Design and Simulation of its Modulation and Demodulation." Advanced Materials Research 912-914 (April 2014): 1146–49. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1146.

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QPSK, a modulation mode with a high frequency band utilization ratio and a strong anti-noise immunity,is widely used in the field of military and satellite communication. This article based on the analysis of the traditional QPSK signal modulation and demodulation mechanism, proposes an improved QPSK signal modulation and demodulation algorithm, and have a further in-depth analysis of the feasibility of this algorithm. Finally, by MATLAB software simulation testing, simulation results shows that the algorithm can accurately generate a QPSK signal and complete a rapidly demodulation of a QPSK signal.

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26

Zhu, Jin, and Dan Dan Yan. "Implementation of QPSK Modulation and Demodulation of FPGA." Applied Mechanics and Materials 427-429 (September 2013): 880–83. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.880.

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This paper studies the realization method of QPSK modulation and demodulation circuit based on FPGA.And the simulation results are given under the environment of MAX+PLUSII .In this paper, the scheme uses phase selection method, compared with the modulation and demodulation method commonly used, design more simple, more suitable for FPGA implementation, the reliability of the system is higher.Through the analysis of the simulation waveform shows, the very good realization of the QPSK modulation and demodulation function.

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27

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 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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28

Lupera Morillo, Pablo Aníbal, and Nelson Solano. "Diseño e implementación de un demodulador QPSK utilizando una técnica de tendencia central." MASKAY 9, no. 2 (May 9, 2019): 51. http://dx.doi.org/10.24133/maskay.v9i2.1170.

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En este trabajo se describe la forma de aplicar la mediana para la demodulación de una señal QPSK y de esa manera recuperar los bits de datos. Los resultados obtenidos muestran que la mediana es una técnica adecuada debido a su simplicidad. Para la modulación de las señales se usaron dos técnicas: síntesis digital directa (DDS) y almacenamiento de fases en memoria. Se compararon estas técnicas para probar posteriormente el funcionamiento del demodulador QPSK. Dicha comparación consistió en probar su eficiencia usando parámetros tales como: consumo de potencia y cantidad de elementos usados; se concluyó que la técnica de memorias es la óptima. Los moduladores y el demodulador con la técnica de tendencia central se diseñaron en lenguaje VHDL y se implementaron en una tarjeta FPGA Virtex-5 de Xilinx.

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29

Tseng, Hsien Wei, Wei Chien, Shih Nan Lu, Wei Chen Lee, Yih Guang Jan, and Yang Han Lee. "Measurement and Simulation of System Performance of Digital Broadcasting System." Applied Mechanics and Materials 284-287 (January 2013): 2908–12. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2908.

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In this paper, we use MATLAB software to build the physical layer transceiver of the Digital Video Broadcasting Terrestrial System (DVB-T) and Additive White Gaussian Noise (AWGN) is added into the transmitted signal during its transmission. The transmitted signal passes through modulation, demodulation, encoding and decoding processes the resulting demodulated signal is compared with the transmitted signal to calculate its Bit Error Rate (BER). Three modulation formats, QPAK, 16-QAM and 64-QAM are simulated and through various Signal to Noise (SNR) ratio to evaluate the system performance. Various encoding techniques such as Reed Solomon Code, Convolutional Code and Viterbi Decoding [1-6] have been implemented and through simulation to make detailed system performance analysis and comparison. detailed system performance simulation, analysis and comparisons.

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30

Chen, Bo, Yangyu Fan, Zhou Tian, Wuying Wang, Bochao Kang, Wei Jiang, and Yongsheng Gao. "An Ultra-Wideband Microwave Photonic Channelized Receiver with Zero-IF Architecture." Applied Sciences 10, no. 1 (December 19, 2019): 30. http://dx.doi.org/10.3390/app10010030.

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A scheme for realizing a zero-intermediate frequency (IF) channelized receiver using a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator and a narrow-band optical filter is proposed. The channelized system only requires one optical frequency comb to achieve zero-IF multi-channel reception of wideband signals, and the spacing of the optical frequency comb only needs to be equal to the sub-channel width, which is very easy to implement. It is found that using photonic IQ demodulation and balanced detection and reception technology can not only eliminate many disadvantages of the traditional zero-IF receiver, including local oscillator (LO) leakage, direct current (DC) offset, even-order distortion, and in-phase/quadrature (I/Q) imbalance, but also reduce the bandwidth and sample rate of the analog-to-digital converter (ADC). It is theoretically proven that the radio frequency (RF) signal with a bandwidth of 3 GHz can be divided into five sub-channels with a bandwidth of 600 MHz and finally demodulated to I/Q basebands, which are also verified with simulation.

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31

Obote, Shigeki, and Kenichi Kagoshima. "Estimation of frequency offset in QPSK demodulation." Electronics and Communications in Japan (Part III: Fundamental Electronic Science) 86, no. 9 (September 2003): 1–12. http://dx.doi.org/10.1002/ecjc.10089.

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32

Wang, Ning, Xiao-Chun Li, and Jun-Fa Mao. "High-Speed Interconnect System Using QPSK Scheme Based on Substrate Integrated Waveguide." Journal of Circuits, Systems and Computers 27, no. 01 (August 23, 2017): 1850014. http://dx.doi.org/10.1142/s0218126618500147.

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In this paper, Quadrature Phase Shift Keying (QPSK) modulation and demodulation system based on a Substrate Integrated Waveguide (SIW) is designed and implemented for high-speed data transmission. The technique of orthogonal multiplexing allows two independent channels to transmit data simultaneously through one waveguide structure. For this proof-of-principle study, a fabricated SIW prototype with bandwidth of 14–28 GHz is designed and optimized through full-wave simulations. The QPSK system prototype is verified with different data rates and bit patterns. Experimental results demonstrate that the bit error rates (BERs) of the received data in channel I/Q are less than 10–12 and the transmission rate can reach up to 15 Gb/s for 27-1 Pseudo Random Binary Sequence (PRBS). The transmission data rate of the proposed QPSK system is two times higher than that of the conventional mixing system.

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33

Ali, Mohamed Syed. "Reconfigurable Modulation Scheme for Communication System." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 3 (March 1, 2018): 624. http://dx.doi.org/10.11591/ijeecs.v9.i3.pp624-628.

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<p>In any communication system transmitter and receiver are used to transmit the signal via wired or wireless channel. In the transmitter, modulation is one of the processes to transmit the signal efficiently. Likewise, receiver contains demodulation to recover the original signal from the transmitter. In general, the communication system uses one modulation/demodulation process at a time. It cannot use different modulation/demodulation within a single system. To overcome this problem reconfiguration technique is implemented. It is the method using different modulation scheme at the same time. It will increase the efficiency of the communication system. QPSK and BPSK modulation technique is used to transmit and receive the signal.</p>

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34

., Uma Devi G. "CARRIER RECOVERY AND CLOCK RECOVERY FOR QPSK DEMODULATION." International Journal of Research in Engineering and Technology 03, no. 05 (May 25, 2014): 304–11. http://dx.doi.org/10.15623/ijret.2014.0305058.

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35

Zhou, Sheng Guo, Wen Jing Shang, Nan Wang, and Victor Rublev. "Design and Implementation of Digital Communication Platform Based on FPGA/DSP." Advanced Materials Research 981 (July 2014): 398–401. http://dx.doi.org/10.4028/www.scientific.net/amr.981.398.

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A method to design and implement digital communication platform was in introduced in this paper. The platform based on software radio method can change modulation method conveniently without the change of hardware system because it used FPGA and DSP to do modulation and signal process. The QPSK modulation and demodulation was implemented in the platform to test this platform.

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36

Yin, Huiwen, Yue Yu, and Zhiping Huang. "DLI-Based DP-QPSK Reception Scheme for Short-Range Optical Communication." Applied Sciences 10, no. 14 (July 13, 2020): 4815. http://dx.doi.org/10.3390/app10144815.

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The unacceptably high cost of digital coherent receivers for short-range optical communication has in recent years fueled the study of alternative transmission schemes that are simultaneously highly performing and cost-effective. However, the proposed solutions (e.g., Kramers–Kronig receiver) usually require the cooperation of a transmitting end, which is unachievable in the context of non-cooperative communication. In this work, we mainly studied a dual-polarization quadrature phase-shift-keying (DP-QPSK) non-coherent reception scheme based on a delay-line interferometer (DLI) and measures to improve the reception performance. A data recovery algorithm was proposed for DLI-based DP-QPSK demodulation. The simulation results demonstrated that the algorithm could accurately recover the raw data from the transmitter. Moreover, decreasing the differential delay of the DLI could effectively increase the chromatic dispersion tolerance of the receiver and the optimal delay scaled inversely with the chromatic dispersion. It was found that a DLI-based DP-QPSK reception scheme is a better choice for short-range, non-cooperative communication with less severe transmission impairments.

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37

Alimenti, Federico, Paolo Mezzanotte, Luca Roselli, Valentina Palazzi, Stefania Bonafoni, Roberto Vincenti Gatti, Luca Rugini, et al. "K/Ka-Band Very High Data-Rate Receivers: A Viable Solution for Future Moon Exploration Missions." Electronics 8, no. 3 (March 22, 2019): 349. http://dx.doi.org/10.3390/electronics8030349.

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This paper presents a feasibility study for a very high data rate receiver operating in the K/Ka-band suitable to future Moon exploration missions. The receiver specifications are outlined starting from the mission scenario and from a careful system analysis. The designed architecture uses a low noise front-end to down-convert the incoming K/Ka-band signal into a 3.7 GHz intermediate frequency (IF). For maximum flexibility, a software defined radio (SDR) is adopted for the I/Q demodulation and for the analog to digital conversion (ADC). The decoding operations and the data interface are carried out by a processor based on field programmable gate array (FPGA) circuits. To experimentally verify the above concepts, a preliminary front-end breadboard is implemented, operating between 27.5 and 30 GHz. The breadboard, which uses components off the shelf (COTS) and evaluation boards (EVBs), is characterized by a 46 dB gain, a 3.4 dB noise figure and a − 37 dBm input-referred 1 dB compression point. Finally, a 40 Msym / s quadrature phase shift keying (QPSK) signal is demodulated by means of a commercially available SDR, demonstrating the above concept. The importance of these results is that they have been obtained exploiting a class of miniaturized and low cost microwave integrated circuits currently available on the market, opening the way to a dense communication infrastructure on cislunar space.

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38

Elashkar, N. E., M. Aboudina, H. A. H. Fahmy, G. H. Ibrahim, and A. H. Khalil. "Memristor based BPSK and QPSK demodulators with nonlinear dopant drift model." Microelectronics Journal 56 (October 2016): 17–24. http://dx.doi.org/10.1016/j.mejo.2016.07.015.

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39

Nekuii, Mehran, Mikalai Kisialiou, Timothy N. Davidson, and Zhi-Quan Luo. "Efficient Soft-Output Demodulation of MIMO QPSK via Semidefinite Relaxation." IEEE Journal of Selected Topics in Signal Processing 5, no. 8 (December 2011): 1426–37. http://dx.doi.org/10.1109/jstsp.2011.2172772.

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Fujii, Akihiro, Futoshi Shirazawa, Yoshiro Kanda, and Hitoshi Murai. "Stable QPSK Demodulation Using a Digital Optical Phase-Locked Loop." IEEE Photonics Technology Letters 26, no. 18 (September 15, 2014): 1847–50. http://dx.doi.org/10.1109/lpt.2014.2337888.

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Saito, Shigeki, Tadao Takami, and Haruo Yamamoto. "Adaptive carrier tracking (ACT) demodulation for QPSK mobile radio transmission." Electronics and Communications in Japan (Part I: Communications) 76, no. 8 (1993): 84–95. http://dx.doi.org/10.1002/ecja.4410760808.

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Betancur Pérez, Andrés Felipe, Ana María Cárdenas Soto, and Neil Guerrero González. "Broad-Range tunable optical wavelength converter for next generation optical superchannels." DYNA 82, no. 194 (December 21, 2015): 72–78. http://dx.doi.org/10.15446/dyna.v82n194.45521.

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A broad-range tunable all optical wavelength conversion scheme that is based on a dual driven Mach-Zehnder modulator with an integrated microwave generator to tune the channel spacing along the entire C band, is proposed. Successful signal demodulation up to 8 wavelength conversions, in steps of 50-400 GHz of 100 Gbps Nyquist QPSK channels with configurable channel spacing is reported. The proposed wavelength conversion scheme enables flexible wavelength routing on gridless optical networks, as can be seen in the Superchannels with a BER lower than 10<sup>-13</sup>.

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R. Udawant, Sandip, and Satyawati Magar. "Modulation and Demodulation of Image Processing by Using GMSK." International Journal of Engineering & Technology 7, no. 3.27 (August 15, 2018): 233. http://dx.doi.org/10.14419/ijet.v7i3.27.17883.

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Today digital communication is widely used in telecommunication sector in which the information is coded in the form of bits. There are many techniques that are implemented for modulation in digital communication some of them are BPSK, QPSK, M-ary PSK, GMSK. While transmitting an image there is always a challenge to retain the quality of an image by using these digital modulation techniques. In this paper GMSK technique is used for transmitting an image. The GMSK modulation technique is widely used in GSM techniques. By using GMSK modulation technique, which carries the information with high data rate and this is very important for image transmission. The proposed system gives better results than other modulation techniques like BPSK and M-ary PSK.

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Chen, Wei-Zen, Tai-You Lu, Wei-Wen Ou, Shun-Tien Chou, and Song-Yu Yang. "A 2.4 GHz Reference-Less Receiver for 1 Mbps QPSK Demodulation." IEEE Transactions on Circuits and Systems I: Regular Papers 59, no. 3 (March 2012): 505–14. http://dx.doi.org/10.1109/tcsi.2011.2165417.

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Thuy, H. T., and S. D. Sun. "Direct Demodulation of Optical BPSK/QPSK Signals without Digital Signal Processing." Radioengineering 27, no. 4 (September 14, 2018): 942–47. http://dx.doi.org/10.13164/re.2018.0942.

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Teronpi, Khushboo, Kandarpa Kumar Sarma, Aradhana Misra, and Manasjyoti Bhuyan. "DTW based Modulation Detection- Verification using Software Defined Radio." WSEAS TRANSACTIONS ON COMMUNICATIONS 20 (August 10, 2021): 133–38. http://dx.doi.org/10.37394/23204.2021.20.18.

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Modulation detection is one of the major tasks of an intelligent receiver in a software defined radio (SDR). It is an intermediate step between signal detection and demodulation. In this paper we present the modulation detection based on Dynamic Time Warping (DTW) algorithm. Here the types of modulation that we use are QPSK, 8-PSK, 16-QAM and 64-QAM. The whole test and verification has been done with the help of SDR platform. After the test and trials of all the modulation schemes, it is observed that DTW provides a good efficiency with the accuracy of 93.75%.

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Rajanna, B. V., SVNL Lalitha, Ganta Joga Rao, and S. K. Shrivastava. "BPSK Modulation and Demodulation with Power Line Carrier Communication and GSM Communication for Smart Metering." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 3 (September 1, 2016): 713. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp713-722.

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GSM/GPRS and PLC communication are used for Automatic Meter Reading (AMR) applications. These AMR systems have made substantial progress over the recent years in terms of functionality, scalability, performance and openness such that they can perform remote metering applications for very demanding and complex systems. By using BPSK (Binary Phase Shift Keying) modulation with Power Line Carrier Communication, Smart Metering can be done in Rural Smart Micro-grids. The design and Simulation of BPSK Modulation and Demodulation are successfully done by using MATLAB/Simulink software. The advantages of using BPSK modulation over the QPSK modulation and the advantages of PLC Communication over the GSM Communication is identified in this paper.

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Kruhlyk, O. S., O. Ya Kaliuzhnyi, and V. Yu Semenov. "Efficient QPSK signal demodulation in channels with unfavorable conditions of radio reception." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 78 (September 30, 2019): 13–18. http://dx.doi.org/10.20535/radap.2019.78.13-18.

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Jiao, Yuqing, Yunpeng Zhu, Xuezhi Hong, Yaocheng Shi, Lei Xu, and Sailing He. "An Integrated Optical Mixer Based on SU8 Polymer for PDM-QPSK Demodulation." IEEE Photonics Technology Letters 23, no. 20 (October 2011): 1490–92. http://dx.doi.org/10.1109/lpt.2011.2163623.

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Zhang, Meng, and Zhisong Bie. "Research on single carrier frequency domain equalization system based on FQPSK modulation." ITM Web of Conferences 17 (2018): 03012. http://dx.doi.org/10.1051/itmconf/20181703012.

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Feher-patented quadrature phase shift keying (fqpsk) modulation is proposed for single-carrier frequency domain equalization (sc-fde). this paper puts forward a new method modulation called cc-bcd-fqpsk. the fqpsk signal is oversampled to make that the discrete fourier transform (dft)/ inverse dft (idft) processing of it can be applied for sc-fde. the methodology for maintaining waveform continuity with a cyclic prefix (cp) is presented. wrap-around viterbi algorithm (wava) is suggested for demodulation after equalization at the receiver. simulation results show that sc-fde system based on cc-bcd-fqpsk modulation has higher spectral efficiency than linear modulation qpsk and is an effective approach for eliminating isi and using nonlinear high power amplifier.

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