Journal articles: 'QPSK'

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Xu, Lei, Jin Nan Zhang, Yan Gan Zhang, and Mi Lin. "Application of a Novel Modulation Scheme of PS-RZ-QPSK Signal in High-Speed Optical Transmission System." Applied Mechanics and Materials 347-350 (August 2013): 1879–83. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1879.

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Modulation principle of dual-polarization quadratu-re phase shift keying signal and polarization-switched QPSK signal are demonstrated and advantages of PS-QPSK are proved in theoretically. A novel modulation scheme of PS-RZ-QPSK signal is proposed in this paper. The scheme reduces transmitter cost by less use of Mach-Zehnder modulator, but also presents similar performance as traditional structure for PS-RZ-QPSK. The simulate result indicates PS-RZ-QPSK can achieve a better transmission performance than DP-RZ-QPSK at the same bit rate (84Gb/s) and baud rate (28GBd), and proves showing the feasibility of novel modulation scheme.

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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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Peleshok, Yevhen, Serhii Vovk, and Khrystyna Solovei. "МЕТОДИКА СИНТЕЗУ ПІДОПТИМАЛЬНОГО АЛГОРИТМУ РОЗДІЛЕННЯ-ДЕМОДУЛЯЦІЇ ДВОХ ВЗАЄМНО НЕОРТОГОНАЛЬНИХ СИГНАЛІВ QPSK." Системи управління, навігації та зв’язку. Збірник наукових праць 3, no. 69 (October 3, 2022): 128–31. http://dx.doi.org/10.26906/sunz.2022.3.128.

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Метою роботи є підвищення завадозахищеності прийому (демодуляції) корисного ЦС з QPSK в умовах впливу потужної подібної завади. Постановка задачі. Розробити правило прийняття рішення про переданий ДП корисного ЦС з QPSK в умовах впливу потужної QPSK-завади. Результати. В статті представлено синтез підоптимального алгоритму демодуляції двох синхронних взаємно неортогональних цифрових сигналів з QPSK- модуляцією. За відсутності завади даний алгоритм вироджується в класичну когерентну демодуляцію цифрового сигналу з QPSK. При суттєвому перевищенні миттєвої потужності завади над миттєвою потужністю корисного цифрового сигналу з QPSK завадозахищеність прийому останнього наближається до завадозахищеності прийому в каналі з адитивним білим гаусівським шумом без завади. Висновок. Даний алгоритм демодуляції може використовуватися при розробці модемних компенсаторів, що забезпечують повторне використання частотного ресурсу, а також при розробці перспективних завадозахищених засобів радіозв’язку.

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Feng, Yongxin, Zhenyu Teng, Fanwei Meng, and Bo Qian. "An Accurate Modulation Recognition Method of QPSK Signal." Mathematical Problems in Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/516081.

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Quadrature phase shift keying (QPSK) modulation has been widely applied in communication systems. With the increasing development of QPSK modulation recognition, it is meaningful for ensuring validity and accuracy of recognition method. Therefore, the method of signal recognition has been presented based on the features of QPSK modulated signal, in which the feature parameters of QPSK signal are extracted. Besides, signal classification is fulfilled through thresholds, and modulation recognition is completed with quartic spectrum. The simulation results show that, the method can recognize QPSK modulation effectively in less sample space condition and can be more accurate.

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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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Luo, Guo Qing, Jian Ding Yu, and Yin Wang. "Frequency Control QPSK Modulator Based on DDS Technology." Applied Mechanics and Materials 599-601 (August 2014): 948–51. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.948.

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This paper introduced a kind of frequency control QPSK modulator based on DDS technology,which is implemented based on FPGA.In this way, frequency control QPSK modulator is not only small size, low cost, system stability and high reliability ,but also can conveniently change the frequency of QPSK signal to adjust different environments.

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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 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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B Reshma Parveen. "A Novel Implementation of QPSK Modulator on FPGA." international journal of engineering technology and management sciences 7, no. 5 (2023): 516–21. http://dx.doi.org/10.46647/ijetms.2023.v07i05.065.

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QPSK is one of the digital modulation techniques in communication system that has wide applications in the field of wireless, satellite communication, Bluetooth, OFDM etc. The Conventional QPSK modulators designs are generally based on IQ approach. In these modulators multipliers are used to separate the modulating signal into the in-phase and quadrature phase which increases the hardware complexity. The objective of this work is to implement the digital QPSK modulator with conventional and another approach of digitization. In this approach a digitized carrier wave is generated and QPSK phase shifting is provided by 4:1 multiplexer according to the data bits. The implementations of both the designs are done on Spartan 3E Xilinx FPGA through the verilog hardware description language. The QPSK modulator based on the Digitized approach is simpler in terms of hardware circuitry.

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Rakhmania, Amalia Eka, Akhmad Mukhibuddin Harvinanda, Hudiono Hudiono, Aad Hariyadi, Hadiwiyatno, and Mochammad Taufik. "Analisis Kinerja Sistem Modulasi Downlink LTE dan 5G pada Kanal AWGN Berbasis MATLAB." Techné : Jurnal Ilmiah Elektroteknika 22, no. 2 (December 5, 2023): 217–40. http://dx.doi.org/10.31358/techne.v22i2.341.

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Pada penelitian ini dilakukan analisis performansi downlink LTE dan 5G dengan menggunakan MATLAB. Penelitian ini bertujuan untuk menganalisis perbandingan kinerja teknik modulasi QPSK, 16-QAM, dan 64-QAM yang digunakan pada downlink LTE dan teknik modulasi QPSK, 16-QAM, 64-QAM, dan 256-QAM pada downlink 5G yang melalui kanal AWGN untuk mengetahui nilai BER pada teknik modulasi yang digunakan. Teknik multiplexing yang digunakan adalah OFDM dan CP-OFDM untuk downlink LTE dan CP-OFDM untuk downlink 5G dengan variasi cyclic prefix yang digunakan adalah kategori ”normal”. Pada downlink LTE, kinerja modulasi QPSK lebih baik dari 16-QAM dan 64-QAM. Pada OFDM, BER QPSK diperoleh 10-19 pada Eb/No 16 dB, BER 16-QAM diperoleh 10-19 pada Eb/No 20 dB dan BER 64-QAM diperoleh 10-8 pada Eb/No 20 dB. Pada CP-OFDM, BER QPSK diperoleh 10-20 pada Eb/No 16 dB, BER 16-QAM diperoleh 10-19 pada Eb/No 20 dB dan BER 64-QAM diperoleh 10-9 pada Eb/No 20 dB. Pada downlink 5G CP-OFDM, kinerja modulasi QPSK lebih baik dari 16-QAM, 64-QAM dan 256-QAM, BER QPSK diperoleh 10-24 pada Eb/No 16 dB, BER 16-QAM diperoleh 10-23 pada Eb/No 20 dB, BER 64-QAM diperoleh 10-14 pada Eb/No 20 dB, dan BER 256-QAM diperoleh 10-7 pada Eb/No 20 dB.

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10

Trambarulo, R., M. V. Schneider, and M. J. Gans. "Gigabit QPSK modulator." Electronics Letters 23, no. 19 (1987): 998. http://dx.doi.org/10.1049/el:19870700.

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11

Zou, Bingrong, Yu Yu, Wenhan Wu, Shoujin Hu, Zheng Zhang, and Xinliang Zhang. "All-optical format conversion from RZ-QPSK to NRZ-QPSK." Frontiers of Optoelectronics 5, no. 3 (July 28, 2012): 330–33. http://dx.doi.org/10.1007/s12200-012-0268-8.

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12

Mayzar, Deby Krisla, Diah Dwiyanti, and Fitri Elvira Ananda. "Rancang Bangun Simulasi Quadrature Phase Shift Keying (QPSK) Berbasis Graphical User Interface (GUI)." Spektral 1, no. 1 (November 13, 2020): 24–29. http://dx.doi.org/10.32722/spektral.v1i1.3433.

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Modulasi QPSK (Quadrature Phase Shift Keying) adalah teknik modulasi digital yang merupakan pengembangan dari modulasi PSK (Phase Shift Keying) dengan memanfaatkan perubahan fasa dari sinyal pembawa.Modulasi PSK dapat mengkodekan dua bit per simbol yang ditujukan untuk meminimalkan bit eror rate (BER). Pada penelitian ini bertujuan untuk membuat aplikasi sederhana menggunakan matlab berbasis GUI untuk memodulasi sinyal biner QPSK. Metode yang dilakukan dalam pembuatan aplikasi dimulai dari tahap perancangan system, tahap coding, desain interface dan tahap pengujian. Aplikasi sederhana yang dirancang sudah berjalan dengan baik dan sesuai dengan teori yang ada dengan beberapa fitur didalamnya yaitu terdapat tombol random berfungsi untuk mengacak angka biner secara otomatis. Kemudian tombol start berfungsi untuk menampilkan sinyal modulator, demodulator, dan sinyal termodulasi atau sinyal QPSK dan sebaran konstelasi diagramnya.Kata kunci: Demodulator, Modulator, GUI, QPSK, Simulasi

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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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Ramadhan, Gilang, Alfredo Bayu Satriya, and Dodi Setiabudi. "ANALISA KINERJA SISTEM SINGLE CARRIER-FREQUENCY DIVISION MULTIPLE ACCESS UNTUK TRANSMISI CITRA." Jurnal Arus Elektro Indonesia 6, no. 1 (April 30, 2020): 12. http://dx.doi.org/10.19184/jaei.v6i1.16397.

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Teknologi Long Term Evolution (LTE) menggunakan 2 sistem pada sisi yang berbeda, yaitu pada sisi downlink dengan OFDMA dan SC-FDMA pada sisi uplink. SC-FDMA memiliki kelebihan pada sisi efisiensi daya dibandingkan dengan OFDMA. Berdasarkan 3GPP Release 8, modulasi LTE meliputi QPSK, 16-QAM dan 64QAM. Penelitian ini bertujuan untuk mengetahui karakteristik BER dan PAPR terhadap SNR, menganalisis perbandingan BER dan PAPR terhadap SNR pada sistem SC-FDMA, dan mengetahui perbandingan kinerja teknik modulasi QPSK, 16-QAM dan 64-QAM. Hasil kinerja sistem melewati kanal yang berdistribusi Rayleigh. Penelitian dijalankan dengan melakukan simulasi pengiriman citra melalui kanal Rayleigh Fading menggunakan modulasi QPSK, 16-QAM, dan 64-QAM. Parameter SNR yang diteliti sebesar 0-16 dB. Hasil simulasi menunjukkan bahwa SC-FDMA memiliki ketahanan noise yang lebih tinggi saat menggunakan modulasi QPSK dengan BER = 0 dB saat SNR = 13 dB dan PAPR yang stabil di angka 0,9 dB.

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Farhan, Mhnd. "Coded Orthogonal Frequency Division Multiplexing System : An Overview." Indonesian Applied Physics Letters 4, no. 2 (December 10, 2023): 57–64. http://dx.doi.org/10.20473/iapl.v4i2.49248.

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This article compares the performance of two modulation techniques—quadrature phase shift keying (QPSK) and M-ary quadrature amplitude modulation (M-QAM) with M=8, 16, 32, and 64—in a coded orthogonal frequency division multiplexing system. As an error-correcting code, convolutional technology is employed. A vehicular channel with additive white gaussian noise (AWGN) is utilized for communication. According to simulation data, for QPSK and M-QAM, a coded orthogonal frequency division multiplexing system performs better than an uncoded one. Additionally, the system performs better with QPSK than it does with M-QAM. Additionally, when M rises, the performance declines.

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Sun, Yanxia, Chikomborero Shambare, and OdunAyo Imoru. "OFDM Network Optimization Using a QPSK Based on a Wind-Driven Genetic Algorithm." Sensors 22, no. 16 (August 18, 2022): 6174. http://dx.doi.org/10.3390/s22166174.

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Quadrature phase shift keying (QPSK) is a digital modulation technique that transmits data at a constant frequency whilst varying the phases of the carrier signal. QPSK is one of the fundamental modulation schemes for orthogonal frequency division multiplexing systems (OFDM). It is a stable modulation technique with good spectral efficiency. However, during transmission, the carrier signal can undergo numerous phase changes. This creates phase ambiguity problems at the receiver end. This results in inter-symbol interference (ISI) and a high bit error rate (BER). In this paper, the wind-driven optimization was incorporated into the genetic algorithm (GA) as its population selection function. This hybrid algorithm was used to determine the phase assignments for the QPSK. The developed QPSK was implemented on an OFDM network and the message signal was recovered at more than 92% accuracy in a noisy Rayleigh fading channel and 100% accuracy in a noiseless channel. The enhancements greatly mitigated phase ambiguity and bit errors.

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Zhao, Yuan, Bingliang Hu, Zhen-An He, Wenjia Xie, and Xiaohui Gao. "Generation and coherent detection of QPSK signal using a novel method of digital signal processing." Modern Physics Letters B 32, no. 04 (February 9, 2018): 1850103. http://dx.doi.org/10.1142/s0217984918501038.

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We demonstrate an optical quadrature phase-shift keying (QPSK) signal transmitter and an optical receiver for demodulating optical QPSK signal with homodyne detection and digital signal processing (DSP). DSP on the homodyne detection scheme is employed without locking the phase of the local oscillator (LO). In this paper, we present an extracting one-dimensional array of down-sampling method for reducing unwanted samples of constellation diagram measurement. Such a novel scheme embodies the following major advantages over the other conventional optical QPSK signal detection methods. First, this homodyne detection scheme does not need strict requirement on LO in comparison with linear optical sampling, such as having a flat spectral density and phase over the spectral support of the source under test. Second, the LabVIEW software is directly used for recovering the QPSK signal constellation without employing complex DSP circuit. Third, this scheme is applicable to multilevel modulation formats such as M-ary PSK and quadrature amplitude modulation (QAM) or higher speed signals by making minor changes.

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Pala-Schonwalder, Pere, Jordi Bonet-Dalmau, F. Xavier Moncunill-Geniz, Francisco del Aguila-Lopez, and Rosa Giralt-Mas. "A Superregenerative QPSK Receiver." IEEE Transactions on Circuits and Systems I: Regular Papers 61, no. 1 (January 2014): 258–65. http://dx.doi.org/10.1109/tcsi.2013.2268313.

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Tsenes, Petros S., Giorgos E. Stratakos, S. Nikolaos, and K. Uzunoglu. "A MMIC QPSK Modulator." Active and Passive Electronic Components 25, no. 1 (2002): 47–70. http://dx.doi.org/10.1080/08827510211280.

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In this paper a MMIC QPSK modulator is described. The bit rate of the baseband signal is 155 Mbits/sec, while the frequency of the carrier isfLO=10 GHz. The modulation is performed directly at the RF band and therefore an IF stage is not necessary. The design contains all the necessary sub-circuits except for the demultiplexer and the low-pass filters, which are used so that the bandwidth of the binary waves can be reduced. The mixers that are contained in the circuit are not the typical Gilbert cells and as a result they occupy a much smaller area (half). The circuit needs no external LO coupler and no RF chocks. The F-20 process of GEC Marconi was used for designing the modulator. The occupied area is approximately12 mm2. Section 1 presents fundamentals on Quadriphase Shift Keying (QPSK), while in Section 2 the characteristics of the F-20 process are described. In the following Sections the sub-circuits, the complete circuit, and its simulated results are presented.

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Jansen, Sander L., Bernhard Spinnler, Itsuro Morita, Sebastian Randel, and Hideaki Tanaka. "100GbE: QPSK versus OFDM." Optical Fiber Technology 15, no. 5-6 (October 2009): 407–13. http://dx.doi.org/10.1016/j.yofte.2009.06.002.

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Krongold, Brian, Timo Pfau, Noriaki Kaneda, and Sian Chong Jeffrey Lee. "Comparison Between PS-QPSK and PDM-QPSK With Equal Rate and Bandwidth." IEEE Photonics Technology Letters 24, no. 3 (February 2012): 203–5. http://dx.doi.org/10.1109/lpt.2011.2174978.

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Sjödin, Martin, Ben J. Puttnam, Pontus Johannisson, Satoshi Shinada, Naoya Wada, Peter A. Andrekson, and Magnus Karlsson. "Transmission of PM-QPSK and PS-QPSK with different fiber span lengths." Optics Express 20, no. 7 (March 19, 2012): 7544. http://dx.doi.org/10.1364/oe.20.007544.

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Nelson, Tom, Erik Perrins, and Michael Rice. "Near Optimal Common Detection Techniques for Shaped Offset QPSK and Feher's QPSK." IEEE Transactions on Communications 56, no. 5 (May 2008): 724–35. http://dx.doi.org/10.1109/tcomm.2008.060155.

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Blagodatsky, G. A., A. A. Kopysov, V. V. Khvorenkov, and I. S. Baturin. "Cognitive Radio System Operational Control Algorithm." Bulletin of Kalashnikov ISTU 22, no. 4 (December 30, 2019): 93. http://dx.doi.org/10.22213/2413-1172-2019-4-93-106.

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Представлен алгоритм оптимального управления системой когнитивного радио в аналоговых и цифровых режимах работы. Алгоритм основан на применении критериев принятия решений в условиях изменяющейся обстановки. Основой алгоритма является максимизация коэффициента эффективности системы в рассматриваемых режимах. Таким образом, система когнитивного радио может выбрать оптимальный режим работы как в конкретной внешней ситуации, так и предпочтительный режим работы при учете всех внешних воздействий.Для эффективной передачи информации при значительно разряженной батарее радиосистеме требуется перейти в режим E3 (мощность 1, 3, 10 Вт; скорость 2400, 9600 бит/с; тип СКК (вид модуляции) 4FSK, QPSK, QPSK; частота 30…300 ОВЧ (VHF) МГц; полоса 6,25/12,5; 6,25/12,5; 25/50/100/150 кГц). Для повышения эффективности передачи информации в этом режиме также целесообразно продолжить управление сигнально-кодовыми конструкциями. При продолжении работы во временных ограничениях требуется перейти в режим работы E4 (мощность 1, 3, 10 Вт; скорость 2400, 9600 бит/с; Тип СКК (вид модуляции) 4FSK, QPSK, QPSK; частота 300…3000 УВЧ (UHF) МГц; полоса 6,25/12,5; 6,25/12,5; 25/50/100/150 12,5 кГц) и направить ресурсы радиосистемы на управление мощностью передачи, тем самым повышая эффективность за счет усиления энергетики радиолинии. Для передачи цифровой речи при разряженной батарее требуется перейти в режим E1 (мощность 1, 10, 100 Вт; скорость 2400, 1200, 800 бит/с; Тип СКК (вид модуляции) OFDM (SSB), QPSK; частота 3…30 ВЧ (HF) МГц; полоса 3,1 кГц), и для повышения эффективности уже требуется управление сигнально-кодовыми конструкциями. При наступлении временных ограничений радиосистеме требуется перейти в режим работы E2 (мощность 1, 3, 10 Вт; скорость 2400, 1200, 800 бит/с; тип СКК (вид модуляции) 4FSK, QPSK, QPSK; частота 30…300 ОВЧ (VHF) МГц; полоса 6,25/12,5; 6,25/12,5; 25/50/100/150 кГц), и для повышения достоверности приема-передачи требуется ресурсы потратить на управление мощностью передачи.Рассматривая эффективность работы радиосистемы в аналоговых и цифровых режимах, можно сделать вывод, что при наступлении временных ограничений эффективно управление мощностью передатчика (увеличение энергетики радиолинии). Однако при работе в цифровых режимах снижение эффективности происходит значительно медленнее, чем при использовании аналоговых режимов. Анализ работы радиосистемы при энергетических ограничениях также показывает более медленное снижение эффективности цифровых режимов; кроме того, в цифровых режимах значительно снижается скорость расхода ресурсов, в то время как в аналоговых режимах она резко возрастает.

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Farhan, Mhnd. "Performance Analysis of Coded Frequency Division Multiplexing." European Journal of Engineering and Formal Sciences 2, no. 3 (December 29, 2018): 56. http://dx.doi.org/10.26417/ejef.v2i3.p56-60.

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This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM

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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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Sjödin, Martin, Pontus Johannisson, Henk Wymeersch, Peter A. Andrekson, and Magnus Karlsson. "Comparison of polarization-switched QPSK and polarization-multiplexed QPSK at 30 Gbit/s." Optics Express 19, no. 8 (April 7, 2011): 7839. http://dx.doi.org/10.1364/oe.19.007839.

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Farhan, Mhnd. "Performance Analysis of Coded Frequency Division Multiplexing." European Journal of Engineering and Formal Sciences 2, no. 3 (December 1, 2018): 56–60. http://dx.doi.org/10.2478/ejef-2018-0017.

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Abstract This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM

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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 (December 1, 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 proposed BPSK and QPSK demodulators have been fabricated in a 0.18-mm digital complementary metal–oxide–semiconductor (CMOS) process where they operate from a single supply of 1.8 V. At a carrier frequency of 60 MHz, the BPSK and QPSK demodulators achieved maximum symbol rates of 25 and 12.5 Msymb/s while consuming 0.68 and 0.79 mW, respectively. At these maximum symbol rates, the BPSK and QPSK demodulators deliver symbol-error rates less than 7.9×10-10 and 9.8×10-10, respectively where their corresponding energy per bit figures were at 27.2 and 31.7 pJ.

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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 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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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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Bokulic, R. S. "Design of differential QPSK modulator." Electronics Letters 27, no. 13 (1991): 1185. http://dx.doi.org/10.1049/el:19910739.

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Gross, R. "Differential encoder for QPSK systems." Electronics Letters 27, no. 14 (1991): 1256. http://dx.doi.org/10.1049/el:19910787.

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ten Brink, S., J. Speidel, and R. H. Yan. "Iterative demapping for QPSK modulation." Electronics Letters 34, no. 15 (1998): 1459. http://dx.doi.org/10.1049/el:19981059.

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Serena, P., N. Rossi, and A. Bononi. "PDM-iRZ-QPSK vs PS-QPSK at 100 Gbit/s over dispersion-managed links." Optics Express 20, no. 7 (March 21, 2012): 7895. http://dx.doi.org/10.1364/oe.20.007895.

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Xu, Fei, Yanfei Xu, Yaojun Qiao, and Huiping Tian. "Comparative analysis of inter-channel nonlinear distortions from PM-QPSK and PS-QPSK interferers." Optics Communications 372 (August 2016): 53–59. http://dx.doi.org/10.1016/j.optcom.2016.03.076.

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Nur Faizah, Intan Rizqiyani. "Analisis Utilisasi Bandwidth dan Power Pada Modulasi QPSK Transponder Extended C-Band Transmisi Loopback Pada Satelit Telkom 3S." Journal of Telecommunication, Electronics, and Control Engineering (JTECE) 2, no. 2 (January 31, 2021): 62–68. http://dx.doi.org/10.20895/jtece.v2i2.114.

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Sistem komunikasi satelit memiliki jangkauan yang sangat luas. Bandwidth dan power merupakan sumber daya yang terbatas dan mahal sehingga diperlukan adanya optimalisasi utilisasi bandwidth dan power, kondisi optimalisasi adalah apabila perbandingan persentase jumlah carrier bandwidth dan power 1:1. Kondisi optimalisasi dipengaruhi oleh perhitungan link budget, penggunaan modulasi yang tepat dan pengaturan FEC. Teknik modulasi QPSK, dengan FEC yang digunakan adalah ¾, 7/8, dan 0,93 menggunakan antena Hub 9 m dan VSAT SCPC berdiameter 2,4 m dan data rate sebesar 1024 kbps. Berdasarkan hasil penelitian ini didapatkan hasil perbandingan jumlah carrier bandwidth dan jumlah carrier power pada modulasi QPSK yang paling baik untuk digunakan adalah pada FEC 0,93 sekalipun belum mencapai kondisi optimalisasi dengan nilai persentase yang dihasilkan sebesar 65,7 %. Sedangkan, FEC yang paling buruk untuk digunaan adalah FEC ¾ dengan hasil persentase sebesar 52,2 %. Keywords: Satelit Telkom 3S, Bandwidth, Power, FEC, QPSK.

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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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Chen, Long, Qian Yu, and Jiajun Liu. "Multifrequency Vector Mm-Wave Signal Generation with No Optical Filtering Based on One Dual-Arm MZM with Phase Factor Optimization." Photonics 10, no. 7 (June 28, 2023): 747. http://dx.doi.org/10.3390/photonics10070747.

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In order to reduce the number of devices in and cost of a multifrequency vector millimeter-wave (mm-wave) signal generation system, we propose a novel scheme for multifrequency vector mm-wave signal generation based on one dual-arm Mach-Zehnder modulator (MZM) without optical filtering. This scheme utilizes the carrier suppression modulation of a single modulator, without the need for optical filtering and combines precoding technology to generate high-frequency QPSK and 16 QAM mm-wave signals. The transmitter is applied with precoding technology to make the frequency multiplying vector mm-wave signal display regular vector modulation at the receiver, and the system is optimized with a phase factor to ensure that the phase distribution of QPSK signal at the receiver is symmetrical. We demonstrated the generation of 4-Gbaud 76 GHz QPSK and 16 QAM vector mm-wave signals through simulation. The simulation results show that, at a fiber transmission distance of 12 km, when the launched optical power of the PD is greater than −20.535 dBm, the bit error ratio (BER) of the QPSK signal is lower than the hard-decision forward error correction (HD-FEC) threshold of 3.8 × 10−3. At a fiber transmission distance of 10 km, when the launched optical power of the PD is greater than −18.637 dBm, the BER of 16 QAM signal is also lower than 3.8 × 10−3.

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Huang, Yang, Xinyi Zheng, Yufei Guo, and Shiming Gao. "Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals." Applied Sciences 12, no. 14 (July 6, 2022): 6828. http://dx.doi.org/10.3390/app12146828.

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Orthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral efficiency and compatibility with the spatial diversity reception to improve receiver sensitivity. Compared with the single-carrier QPSK signal, the OFDM-QPSK signal with 64 sub-carriers can reduce the BER from 2.87 × 10−3 to 2.98 × 10−4 at the SNR of 6 dB. Using a two-aperture spatial diversity reception with OFDM, the BER can be reduced from 2.45 × 10−3 of a single receiver to 6.10 × 10−4 under moderate turbulence conditions. Under strong turbulence, the BER of the single receiver is 2.14 × 10−2. It can be improved to 1.16 × 10−3 by using four-aperture receivers, and even 6.87 × 10−4 by using six-aperture receivers. The optimized aperture number should be selected according to channel conditions.

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Ahmed, Md Firoz, Md Faysal Ahmed, and Abu Zafor Md. Touhidul Islam. "Comparison of Bit Error Rate Performance of Various Digital Modulation Schemes over AWGN and Rayleigh Fading Channels using Simulink." International Journal of Ambient Systems and Applications 9, no. 2 (June 30, 2021): 7–16. http://dx.doi.org/10.5121/ijasa.2021.9202.

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Digital modulation increases information capacity, data security, and system availability while maintaining high communication quality. As a result, digital modulation techniques are in higher demand than analog modulation techniques due to their ability to transmit larger amounts of data. Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Differential Phase Shift Keying (DPSK), and Quadrature Amplitude Modulation (QAM) are critical components of current communications systems development, particularly for broadband wireless communications. In this paper, the comparison of bit error rate performance of different modulation schemes (BPSK, QPSK, and16-QAM) and various equalization techniques such as constant modulus algorithm (CMA) and maximum likelihood sequence estimate (MLSE) for the AWGN and Rayleigh fading channels is analyzed using Simulink. BPSK outperforms QPSK and 16-QAM when compared to the other two digital modulation schemes. Among the three digital modulation schemes, BPSK is showing better performance as compared to QPSK and 16-QAM.

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Aikawa, Yohei. "Optical Comparison Operation for 8-Bit QPSK-Modulated Signal by Using Serially-Cascaded Delay Line Interferometer." Applied Sciences 8, no. 9 (August 23, 2018): 1440. http://dx.doi.org/10.3390/app8091440.

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An all-optical comparator is desirable to realize large-capacity, fully-transparent, and energy-efficient communication systems, as it is considered to be a fundamental component to perform most of the operations, including packet switching, label recognition, error detection and correction, and so on. However, most of the previous studies have been confined to the on–off keying (OOK) modulation format, not phase-shift keying (PSK) modulation. In this paper, the author provides a novel optical comparator designed for quadrature PSK (QPSK)-modulated signal, which comprises a code word with 8-bit length, using a serially-cascaded delay line interferometer. The proposed comparator yields constellations having the information of a Hamming distance based on the designed code, when several patterns of QPSK signal are injected into the comparator. The paper experimentally demonstrates the feasibility of the optical comparison operation for 8-bit QPSK-modulated return-to-zero (RZ) signal at 10 Gbaud.

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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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Nölle, Markus, Johannes Karl Fischer, Lutz Molle, Carsten Schmidt-Langhorst, David Peckham, and Colja Schubert. "Comparison of 8 × 112 Gb/s PS-QPSK and PDM-QPSK signals over transoceanic distances." Optics Express 19, no. 24 (November 14, 2011): 24370. http://dx.doi.org/10.1364/oe.19.024370.

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Diao, Shengxi, Yuanjin Zheng, Yuan Gao, San-Jeow Cheng, Xiaojun Yuan, Minkyu Je, and Chun-Huat Heng. "A 50-Mb/s CMOS QPSK/O-QPSK Transmitter Employing Injection Locking for Direct Modulation." IEEE Transactions on Microwave Theory and Techniques 60, no. 1 (January 2012): 120–30. http://dx.doi.org/10.1109/tmtt.2011.2174377.

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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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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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Cui, Jiabin, Yuefeng Ji, Guo-Wei Lu, Huashun Wen, Kunpeng Zhai, Xin Wang, and Ninghua Zhu. "Optical format interconversion nodes between OOK and QPSK enabled by a reconfigurable two-dimensional vector mover." Optics Express 30, no. 18 (August 22, 2022): 32577. http://dx.doi.org/10.1364/oe.465560.

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An optical format interconversion scheme between on-off keying (OOK) and quadrature phase shift keying (QPSK) is proposed and verified in this paper. The conversion system mainly consists of a coherent vector combiner and a reconfigurable two-dimensional (2D) vector mover. As a key element of the proposed conversion system, the 2D vector mover is implemented by a non-degenerate phase-sensitive amplifier (PSA). The operating principle and theoretical derivations of the PSA-based 2D vector mover are fully introduced. The reconfigurable transfer characteristics of the vector mover are analyzed under different parameter settings to exhibit the flexible 2D moving function. The signal constellations, eye diagrams, spectrum, error vector magnitudes, and bit error ratios are estimated and depicted to validate the proposed idea. With the input signal-to-noise ratios of 20 dB and 25 dB, error-free conversions are achieved between 50G Baud OOK and QPSK. The scheme proposed in this paper fills the lack of the one-to-one interconversion between OOK and QPSK, and has potential applications in optical interconnect nodes, across-dimensional optical transmissions, and flexible optical transceivers.

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Ahmed, Md Firoz, Md Tahidul Islam, and Abu Zafor Md. Touhidul Islam. "Performance of Convolution and CRC Channel Encoded V-Blast 4x4 MIMO MC-CDMA Wireless Communication System." International Journal of Ambient Systems and Applications 9, no. 2 (June 30, 2021): 1–6. http://dx.doi.org/10.5121/ijasa.2021.9201.

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Wireless communications are among the rapidly growing fields in our current life and have a massive effect on every aspect of our everyday life. In this paper, the performance of the various digital modulation techniques (BPSK, DPSK, QPSK, and QAM) based wireless communication system on the audio signal transmission through the additive Gaussian Noise (AWGN) channel is assessed on the basis of bit error rate (BER) as a function of the signal-to-noise ratio (SNR). Based on the results of this study, BPSK modulation outperforms the DPSK, QPSK, and QAM modulation strategies in the MIMO MC-CDMA VBlast based wireless communication system. The digital modulation of QPSK shows the worst performance in audio signal transmission especially in comparison to other digital modulations. It is clear from the current simulation study based on MATLAB that the V-Blast encoded 4×4 MIMO MC-CDMA wireless system with minimum mean square error (MMSE) signal detection and 1⁄2-rated convolution and cyclic redundancy check (CRC) channel encoding strategies show good performance utilizing BPSK digital modulation in audio signal transmission.

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Shabaan, Omar Y., and Omar A. Athab. "Hybrid compensation of polarization-multiplexed QPSK optical format for high bit rate networks." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 3 (December 1, 2020): 1325. http://dx.doi.org/10.11591/ijeecs.v20.i3.pp1325-1331.

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Transmitting the highest capacity throughput over the longest possible distance without any regeneration stage is an important goal of any long-haul optical network system. Accordingly, Polarization-Multiplexed Quadrature Phase-Shift-Keying (PM-QPSK) was introduced lately to achieve high bit-rate with relatively high spectral efficiency. Unfortunately, the required broad bandwidth of PM-QPSK increases the linear and nonlinear impairments in the physical layer of the optical fiber network. Increased attention has been spent to compensate for these impairments in the last years. In this paper, Single Mode Fiber (SMF), single channel, PM-QPSK transceiver was simulated, with a mix of optical and electrical (Digital Signal Processing (DSP)) compensation stages to minimize the impairments. The behaviour of the proposed system was investigated under four conditions: without compensation, with only optical compensator, with only DSP compensator and finally with both compensators. An evidence improvement was noticed in the case of hybrid compensation, where the transmission distance was multiplied from (720 km) to more than (3000 km) at 40 Gb/s.

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Journal articles on the topic 'QPSK'

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