Relevant bibliographies by topics / QPSK

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

Academic literature on the topic 'QPSK'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "QPSK"

1

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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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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Dissertations / Theses on the topic "QPSK"

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Dang, Xiaoyu. "Space-Time Shaped Offset QPSK." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606190.

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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California
This paper describes the use of orthogonal space-time block codes to overcome the performance and complexity difficulties associated with the use of Shaped Offset QPSK (SOQPSK) modulation, a ternary continuous phase modulation (CPM), in multiple-input multiple-output telemetry systems. The orthogonal space-time block code is applied to SOQPSK waveforms in the same way it would be applied to symbols. The procedure allows the receiver to orthogonalize the link. The main benefits of this orthogonalization are the easy realization of the transmit diversity for the offset-featured SQOSPK, and the removal of the noise correlation at the input to the space-time decoder and the elimination of I/Q interference when space time orthogonalization is applied to the symbol level.
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Machado, Hélder Filipe Pereira. "Implementação em FPGA de um Modem QPSK." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/15897.

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Mestrado em Engenharia Eletrónica e Telecomunicações
Esta dissertação insere-se num conjunto de trabalhos a decorrer no Instituto de Telecomunicações de Aveiro que tem como objetivo o desenvolvimento de um sistema de comunicação para um UAV. Neste sentido, apresenta a implementação e validação de um modem em banda base aberto e flexível implementado em FPGA, baseado em abordagem SDR, com possibilidade de integraçãoo no sistema de comunicação com o UAV. Ao longo desta dissertação implementou-se, utilizando o MATLAB, um modem de modulação adaptável, ao qual foram integrados algoritmos de sincronismo e de correção de fase. Desta forma, foi possível realizar uma análise ao modelo comportamental dos vários constituintes do modem abstraindose dos tempos de atraso do processamento ou da precisão da representação dos dados, e assim simplificar a sua implementação em hardware. Analisado o modelo comportamental do modem desenvolvido em MATLAB realizou-se a sua implementação em hardware para a modulação QPSK. A sua prototipagem foi realizada, com recurso à ferramenta computacional Vivado Design Suite 2014.2, utilizando o kit de desenvolvimento ZedBoard e o frontend AD-FMCOMMS1-EBZ. O correto funcionamento dos módulos implementados em hardware foi posteriormente avaliado através de uma interface entre o MATLAB e a Zed- Board, sendo que, os resultados obtidos no modelo em MATLAB serviram como termo de comparação. Através da utilização desta interface é possível validar parte do modem implementado em FPGA, mantendo o restante processamento a ser realizado em MATLAB, validando assim os módulos em FPGA de uma forma isolada.
This thesis is part of a series of work in progress at the Instituto de Telecomunicações of Aveiro which aims to develop a communication system for an UAV. Thereby, it presents the implementation and validation of a exible and open baseband modem implemented in FPGA, based on SDR approach, that can be integrated in the communication system with the UAV. Throughout this thesis was implemented an adaptive modulation modem and have been integrated timing recovery and phase correction algorithms, using the MATLAB. Thus, it is possible to perform an analysis of the behavioral of the several modem components abstracting the delay times of the processing or the precision of data representation, simplifying its hardware implementation. Analyzed the modem behavior developed in MATLAB was performed its hardware implementation for the QPSK modulation. Its prototype was done using the computational tool Vivado Design Suite 2014.2, the ZedBoard development kit and the frontend AD-FMCOMMS1-EBZ. The proper function of the modules implemented in hardware was evaluated by an interface between MATLAB and ZedBoard. This interface allows an individual validation of the implemented modem components in FPGA, keeping the remaining processing to be done in MATLAB and compared with the ones obtained in MATLAB.
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Dang, Xiaoyu. "Offset QPSK in SISO and MIMO Environments." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1751.

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We demonstrate how the performance of offset quadrature phase-shift keying (OQPSK) and its variants of Feher-patented QPSK (FQPSK) and Shaped Offset QPSK (SOQPSK) (collectively known as the ARTM Tier-1 waveforms) in single input single output (SISO) system could change with the channel fading parameters. The bit error rate expression of offset QSPK and ATRM Tier-1 waveforms over the aeronautical telemetry multipath channel has been derived. Simulations show that for the case of a single multipath ray, the BER gets worse with increasing Γ for a fixed delay, and that the BER has a quasi-periodic property for fixed Γ and increasing τ. For the case of two multipath rays, the multipath component characterized by large amplitude and small delay is the main factor of the BER degradation, while the BER is not very sensitive to the change of multipath delay. Analysis of the average bit error probability shows that a relatively high error floor at approximately 10−2 occurs for |Γ1| ≥ 0.5. When offset quadrature phase-shift keying (OQPSK) is used in multiple input multiple output (MIMO) environment, orthogonal space-time block codes can be applied to waveforms to orthogonalize a space-time coded multiple-input, multiple output link. For offset QPSK, this technique has the advantage of eliminating the I/Q interference associated with simultaneous transmission of offset QPSK waveforms. In addition, orthogonalization presents uncorrelated noise samples to the space-time trellis decoder. As a consequence, a less complex space-time decoder (relative to what would be required without orthogonalization) can be used. It is demonstrated that a concatenated system based on an orthogonal space-time block code and a trellis code, optimized for single-input, single-output fading channel, outperforms a space-time trellis code for a 2x1 system. The space-time block code orthogonalizes the channel seen by the outer code and this simplifies the computations required for decoding. The advantages of orthogonalization are achieved at the expense of rate. In the examples presented, the codes were chosen to have roughly equivalent bit error rate performance and identical code rates: the complexity was compared.
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Weitzman, Jonathan M. "SELECTABLE PERMUTATION ENCODER/DECODER FOR A QPSK MODEM." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605817.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada
An artifact of QPSK modems is ambiguity of the recovered data. There are four variations of the output data for a given input data stream. All are equally probable. To resolve this ambiguity, the QPSK data streams can be differentially encoded before modulation and differentially decoded after demodulation. The encoder maps each input data pair to a phase angle change of the QPSK carrier. In the demodulator, the inverse is performed - each phase change of the input QPSK carrier is mapped to an output data pair. This paper discusses a very simple and unique differential encoder/decoder that handles all possible data pair/phase change permutations.
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Portelinha, Francisco Martins. "Uma tecnica de processamento digital para modem QPSK." [s.n.], 1994. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259768.

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Orientador: Rege Romeu Scarabucci
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica
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Resumo: Este trabalho apresenta uma nova técnica de processamento puramente digital para realizar as funções de modulação e demodulação QPSK (Quadrature Phase Shift Keying). Um protótipo experimental foi realizado e as medidas de desempenho mostraram resultados satisfatórios, compatíveis com desempenho obtidos através de outras implementações físicas
Abstract: Not informed.
Mestrado
Mestre em Engenharia Elétrica
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Ghate, Dilip B. "Implementation of a digital communication system using QPSK modulation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA305334.

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Nelson, Tom. "ALAMOUTI SPACE-TIME CODING FOR QPSK WITH DELAY DIFFERENTIAL." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/607483.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada
Space-time coding (STC) for QPSK where the transmitted signals are received with the same delay is well known. This paper examines the case where the transmitted signals are received with a nonnegligible delay differential when the Alamouti 2x1 STC is used. Such a differential can be caused by a large spacing of the transmit antennas. In this paper, an expression for the received signal with a delay differential is derived and a decoding algorithm for that signal is developed. In addition, the performance of this new algorithm is compared to the standard Alamouti decoding algorithm for various delay differentials.
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Uzunoglu, Vasil, and Ann B. Maiorano. "PHASE CORRECTION AND PHASE CANCELLING NETWORKS IN QPSK MODEMS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615732.

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International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, Nevada
At bit rates lower than 100Mbit/s, the Synchronous Oscillator (SO) [1-4] has substantial tracking band combined with steep skirt selectivity to satisfy all the requirements of a carrier recovery network without the need for a phase correction network. At higher bit rates however, there is a need for a phase correction or phase cancelling network, if the BER variations with respect to hard wired case must be confined to less than 0.2dB with IF offsets of ±30kHz. At bit rates higher than 100Mbit/s, the multiply by four process in a QPSK modem deteriorates the signal-to-noise ratio by more than 15 dB (18dB at Eb/No = 6.4 dB) and the synchronization signal-to-noise ratio at the input to the SO drops below 0dB (!5dB at Eb/No = 6.4dB). This reduction in the signal-to-noise ratio reduces the tracking band of the SO which in turn increases the phase shift per unit frequency offset.
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Freitas, Alexandre Passos 1986. "Desenvolvimento de um modulador DP-QPSK em fotônica integrada." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259181.

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Orientadores: Hugo Enrique Hernandez Figueroa , Júlio César Rodrigues Fernandes de Oliveira
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: O crescente aumento da demanda de tráfego de dados dos sistemas de comunicação ópticos em conjunto com a busca da integração e miniaturização cada vez maior dos componentes impulsionaram a fotônica integrada em silício como uma das tecnologias promissoras para a evolução das novas gerações de dispositivos ópticos. Esta tecnologia, além de possuir suas características de um alto contraste de índice de refração, capacidade de modulação óptica através de controle de temperatura ou por densidade de portadores, se utiliza da infra-estrutura de fabricação para a indústria de microeletrônica já desenvolvida nas últimas décadas. Neste cenário, este trabalho propõe o desenvolvimento de um modulador de fase fabricado com a tecnologia de fotônica integrada em silício para o formato de modulação DP-QPSK e que opere na banda C de comunicação óptica. Análises de simulações e experimentais foram realizadas para a validação do fluxo de desenvolvimento do circuito e de cada componentes utilizado individualmente
Abstract: The increasing demand for data in optical communication systems with a constant search for reduction of device dimensions boosted silicon photonics as a candidate technology to the following optical device generations. Besides having high refractive index contrast, modulation capabilities through thermal or by carrier density control, this technology takes advantage of the microelectronic infra-structure developed in the last decades to fabricate small optical components with high reliability. In this scenario, this dissertation proposes the design of a phase modulator in silicon photonic technology. This modulator is able to operate at C-band and make the DP-QPSK modulation. Simulation and experiment analysis were made to validate the design flow for the optical circuit and for each single component
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Portela, Thiago Ferreira. "Técnicas de recuperação de relógio para sistemas DP-QPSK." reponame:Repositório Institucional da UnB, 2012. http://repositorio.unb.br/handle/10482/13345.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2012.
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Este trabalho propõe um novo método de estimação de erros de temporização para sistemas ópticos com multiplexação em polarização, detecção coerente e modulação de fase por chaveamento em quadratura (dual-polarization quadrature phase-shift keying - DP-QPSK). Em tais sistemas, a recuperação de relógio e a equalização são operações cruciais do processo de recuperação da informação transmitida e possuem uma relação de interdependência: a equalização depende da correta amostragem do sinal, enquanto a recuperação de relógio requer a pré-compensação das distorçõe lineares para obter desempenho satisfatório. O algoritmo proposto resolve esse problema por meio da cooperação entre equalização e recuperação de relógio, utilizando os coeficientes de um equalizador adaptativo para estimar o erro de temporização do sinal recebido. O desempenho do algoritmo proposto foi validado e comparado ao desempenho do algoritmo de Gardner utilizando dados experimentais gerados por um sistema óptico DP-QPSK, operando à taxa de 112 Gb/s. Os dados experimentais foram cedidos pela Ericsson-Alemanha e processados de modo on-line, utilizando o software de simulação Matlab. O algoritmo proposto conseguiu sincronizar o relógio em todos os casos ava- liados, inclusive nas situações em que o algoritmo de Gardner se mostrou incapaz. No entanto, apresentou uma leve penalidade em comparação ao mesmo sinal sem erro de temporização. Ademais, constatou-se que o per´ıodo de convergência da sincronização realizada pelo algoritmo está diretamente relacionado ao comprimento do equalizador. O algoritmo proposto se mostrou uma alternativa interessante para sistemas ópticos DP-QPSK. ______________________________________________________________________________ ABSTRACT
This work proposes a novel method of timing error estimation in polarization multi- plexed quadrature phase-shift keying (DP-QPSK) optical systems that employ coherent detection. In these systems, clock recovery and equalization are two crucial operations of the information recovery process that are interdependent: equalization depends on the correct signal sampling, whereas clock recovery requires a previous linear distorti- ons’ compensation for a satisfactory performance. The proposed algorithm solves this problem by collaboration between equalization and clock recovery processes, using the equalizer coefficients to estimate the received signal timing error. The performance of the proposed algorithm was validated and compared to the per- formance of the Gardner algorithm using experimental data, generated by DP-QPSK optical systems, transmitting at 112 Gb/s. These data were provided by Ericsson- Germany and processed offline, using Matlab simulation software. The proposed al- gorithm managed to synchronize the clock in all evaluated cases, including the cases where the Gardner algorithm failed. However, it presented a slight penalty comparing to the same signal without the timing error. Also, it was found that the synchroniza- tion convergence time is directly related to the equalizer length. Thus, the proposed algorithm is an interesting alternative for DP-QPSK optical systems.
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Books on the topic "QPSK"

1

Jet Propulsion Laboratory (U.S.), ed. Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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Jet Propulsion Laboratory (U.S.), ed. Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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Jet Propulsion Laboratory (U.S.), ed. Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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Jet Propulsion Laboratory (U.S.), ed. Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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Jet Propulsion Laboratory (U.S.), ed. Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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United States. National Aeronautics and Space Administration., ed. The effect of pulse shaping QPSK on bandwidth efficiency over a non-linear channel: A technical report ... Las Cruces, N.M: New Mexico State University, 1997.

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Rudy, Larry J. The performance of conventional and DBD receivers for MFSK/QPSK modulation when operating in the presence of noise and Rayleigh fading. Monterey, Calif: Naval Postgraduate School, 1988.

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Leverington, Mark. QPSK modern techniquews. 1996.

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Phase-ambiguity resolution for QPSK modulation systems. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1989.

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Frostenson, Nels A. 2 FSK/QPSK transmitter and receiver: Design and performance. 1987.

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Book chapters on the topic "QPSK"

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Khawar, Awais, Ahmed Abdelhadi, and T. Charles Clancy. "QPSK Radar Waveform." In SpringerBriefs in Electrical and Computer Engineering, 23–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29725-5_3.

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Best, Roland. "Conventional Costas Loop for QPSK." In Costas Loops, 35–47. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-72008-1_4.

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Best, Roland. "Modified Costas Loop for QPSK." In Costas Loops, 65–75. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-72008-1_6.

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Li, Yupeng. "Investigation of CO-OFDM-6PolSK-QPSK Modulation." In Lecture Notes in Electrical Engineering, 1490–94. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6571-2_180.

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Usha, S. M., and H. B. Mahesh. "Optimization and Performance Analysis of QPSK Modulator." In Lecture Notes in Electrical Engineering, 691–702. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5558-9_60.

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Butkiewicz, Bohdan S. "Fuzzy Model of QPSK and QAM Modulation." In Emerging Intelligent Technologies in Industry, 297–305. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22732-5_24.

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Pfau, Timo, and Reinhold Noé. "Real-Time Digital Coherent QPSK Transmission Technologies." In High Spectral Density Optical Communication Technologies, 203–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10419-0_11.

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Best, Roland. "Costas Loop for QPSK Using Phasor Rotator Circuit." In Costas Loops, 107–16. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-72008-1_9.

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Janu, Dimpal, and Vijay Janyani. "Performance of QPSK Modulation for FSO Under Different Atmospheric Turbulence." In Lecture Notes in Electrical Engineering, 513–20. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6159-3_54.

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Bhagyashree, K., S. Ramakrishna, and Priyatam Kumar. "Analysis of PAPR for Performance QPSK and BPSK Modulation Techniques." In Emerging Research in Computing, Information, Communication and Applications, 621–27. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5953-8_51.

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Conference papers on the topic "QPSK"

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Bekele, Dagmawi, Hitesh Sahoo, Deming Kong, Michael Galili, Kresten Yvind, Leif Katsuo Oxenløwe, and Jesper Mørk. "Direct-detection receiver for QPSK-modulated signals." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m3z.17.

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We demonstrate a novel optical receiver for direct-detection of QPSK signals using microring-based photonic integrated circuit. The QPSK signal is converted into a PAM7 electrical signal, and demodulated without the need for a local oscillator.
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Anandan, Mukund, Ankita Jain, Syed Tajammul Ahmad, and K. Pradeep Kumar. "RF pulse shaping for QPSK, PM-QPSK and QAM formats." In Frontiers in Optics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/fio.2013.fw4b.6.

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Birla, Nakul, Nishit Gautam, Jasmeen Patel, and Pavithra Balaji. "A novel QPSK Modulator." In 2014 International Conference on Advanced Communication, Control and Computing Technologies (ICACCCT). IEEE, 2014. http://dx.doi.org/10.1109/icaccct.2014.7019170.

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Popescu, S. O., A. S. Gontean, and D. Ianchis. "QPSK Modulator on FPGA." In 2011 IEEE 9th International Symposium on Intelligent Systems and Informatics (SISY 2011). IEEE, 2011. http://dx.doi.org/10.1109/sisy.2011.6034353.

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Nelson, T., E. Perrins, and M. Rice. "Common detectors for shaped offset QPSK (SOQPSK) and Feher-patented QPSK (FQPSK)." In GLOBECOM '05. IEEE Global Telecommunications Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/glocom.2005.1578470.

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Olsson, Bengt-Erik, and Mats Sköld. "QPSK Transmitter Based on Optical Amplitude Modulation of Electrically Generated QPSK Signal." In Asia Optical Fiber Communication and Optoelectronic Exposition and Conference. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/aoe.2008.saa3.

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Sjödin, Martin, Pontus Johannisson, Peter A. Andrekson, and Magnus Karlsson. "Linear and Nonlinear Crosstalk Tolerance of Polarization-Switched QPSK and Polarization-Multiplexed QPSK." In European Conference and Exposition on Optical Communications. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/ecoc.2011.mo.2.b.5.

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Serena, P., A. Vannucci, and A. Bononi. "The performance of polarization switched-QPSK (PS-QPSK) in dispersion managed WDM transmissions." In 2010 36th European Conference and Exhibition on Optical Communication - (ECOC 2010). IEEE, 2010. http://dx.doi.org/10.1109/ecoc.2010.5621247.

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Sharma, Anshuman, Vishnu Kishore Pai, and N. Reviraj. "Spectral inversion in QPSK receiver." In 2016 International conference on Signal Processing, Communication, Power and Embedded System (SCOPES). IEEE, 2016. http://dx.doi.org/10.1109/scopes.2016.7955766.

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Fusco, V. F., C. Wang, and T. Pochiraju. "35-65GHz MMIC QPSK Modulator." In 2008 European Microwave Integrated Circuit Conference (EuMIC). IEEE, 2008. http://dx.doi.org/10.1109/emicc.2008.4772274.

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Reports on the topic "QPSK"

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Rice, Michael, and Mohammad Saquib. On the Ungerboeck and Forney Observation Models for Offset QPSK. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada557561.

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Irizarry, Alfredo V. Development of the Average Likelihood Function for Code Division Multiple Access (CDMA) Using BPSK and QPSK Symbols. Fort Belvoir, VA: Defense Technical Information Center, January 2015. http://dx.doi.org/10.21236/ada619004.

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Reiersen, W., P. Heitzenroeder, G. Neilson, B. Nelson, M. Zarnstorff, T. Brown, M. Cole, et al. Progress In NCSX and QPS Design and Construction. Office of Scientific and Technical Information (OSTI), October 2005. http://dx.doi.org/10.2172/899587.

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