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papr Reduction of NOMA Using Vandermonde Matrix-Particle Transmission Sequence

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Computer Systems Science & Engineering 2022年第10期43卷 193-201页

作者： Arun Kumar Sandeep Gupta Himanshu Sharma Mehedi Masud Department of Electronics and Communication Engineering JECRC UniversityJaipur303905India Department of Electrical Engineering JECRC UniversityJaipur303905India Department of Computer Science and Engineering JECRC UniversityJaipur303905India Department of Computer Science College of Computers and Information TechnologyTaif University11099Saudi Arabia

Non-Orthogonal Multiple Access(NOMA)is an ideal choice for 5G waveforms due to their characteristics such as high data rate,massive device connectivity,high spectral access,and effective frequency selective ***,it permits gigantic *** spectrum overlaps with NOMA,which consents several operators to segment the spectrum at the same *** features make NOMA more suitable for use beyond *** to Average Power(papr)is a major problem in Multi-Carrier Techniques(MCT)like NOMA and it also degrades the performance of the *** Partial Transmission Sequence(PTS)is a superior algorithm for moderating the ***,it also increases the complexity of the *** papr is reduced in NOMA by multiplying the NOMA signal with optimised phase vectors(P).The phase vectors are generated by using the Vandermonde Matrix(VM).In this work,we proposed a VM-PTS algorithm for the NOMA system,and the number of computations to search the optimal phase vectors for NOMA high papr signal is less as compared with existing *** outcomes demonstrate that the performance of the recommended PTS in terms of papr,Bit Error Rate(BER),and complexity is better than the conventional PTS(C-PTS).

关键词： VM-PTS NOMA papr 5G

papr reduction for FBMC-OQAM systems using P-PTS scheme

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The Journal of China Universities of Posts and Telecommunications 2015年第6期22卷 78-85页

作者： Liu Kaiming Hou Jundan Zhang Peng Liu Yuan'an School of Telecommunication Engineering Beijing University of Posts and Telecommunications

Filter bank multi-carrier （FBMC） with offset quadrature amplitude modulation （OQAM） has been regarded as one of the candidates for next generation broadband wireless communication systems. Being a multi-carrier technique, FBMC suffers from the inherent drawback of high peak-to-average power ratio （papr）. And it has been turned out that conventional papr reduction schemes for orthogonal frequency division multiplexing （OFDM） systems are ineffective for FBMC-OQAM systems, due to the overlapping structure of FBMC-OQAM signals. In this paper, we propose an efficient papr reduction scheme based on a two-step optimization structure, named pretreated partial transmit sequence （P-PTS）. The first step uses a multiple overlapping symbols joint optimization scheme that the phase rotation sequences for current symbol is determined and optimized according to previous overlapped symbols. And in the second step, it employs a novel segment papr reduction scheme based on PTS technique. Simulation results indicate that the proposed P-PTS scheme can achieve better papr reduction performance than conventional methods with lower computational complexity and the complexity can be traded off more flexibly with papr reduction performance.

关键词： FBMC-OQAM papr P-PTS

papr Reduction in NOMA by Using Hybrid Algorithms

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Computers, Materials & Continua 2021年第10期69卷 1391-1406页

作者： Mohit Kumar Sharma Arun Kumar Department of Electronics and Communication Engineering JECRC UniversityJaipur303905India

Non-orthogonal multiple access(NOMA)is gaining considerable attention due to its features,such as low out-of-band radiation,signal detection capability,high spectrum gain,fast data rate,and massive D2D *** may be considered for 5G ***,the high peak-to-average power ratio(papr)is viewed as a significant disadvantage of a NOMA waveform,and it weakens the quality of signals and the throughput of the *** this article,we introduce a modified NOMA system by employing a block of wavelet transform,an alternative to FFT(Fast Fourier transform).The modified system combines the details of fractional frequency and time analysis of NOMA *** this correspondence,we utilize an advanced partial transmission scheme(PTS),and selective mapping(SLM),and present a genetic algorithm(GA)for SLM to investigate the peak power performance of a WT-based NOMA *** performance of WT-SLM,WT-PTS,and WT-SLM-GA methods is compared with that of the traditional NOMAbased SLM and PTS *** simulation results demonstrate that the proposed system effectively reduces papr in comparison with the traditional schemes.

关键词： papr wavelet transform NOMA PTS SLM 5G

Modified PTS-based papr reduction for ACO-OFDM in visible light communications

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Science China(Information Sciences) 2015年第12期58卷 214-216页

作者： TAN JianDong WANG Qi WANG ZhaoCheng Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Electronic Engineering Tsinghua University

Dear editor,Visible light communication(VLC)has raised great interests since it supplements the unlicensed spectrum resource for ultra-high data rate transmission[1].In order to resist time dispersion and guarantee the

关键词： papr ACO PTS Modified PTS-based papr reduction for ACO-OFDM in visible light communications OFDM

A Modified Hadamard Based SLM without Side Information for papr Reduction in OFDM Systems

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China Communications 2019年第12期16卷 124-131页

作者： Ning Li Mingjin Li Zhongliang Deng School of Electronic Engineering Beijing University of Posts and Telecommunications

High peak-to-average power ratio(papr) is a concern in orthogonal frequency division multiplexing(OFDM) systems. Hadamard based selected mapping(HSLM) which uses Hadamard code as the phase sequence in selected mapping(SLM) is an attractive technique to reduce papr. But it requires sending side information(SI) to the receiver for each data block, and this results in a reduction in bandwidth efficiency. In this paper, we proposed a modified papr reduction method called semi-Hadamard based selected mapping(semi-HSLM) to decouple the phase information matrix into a phase rotation matrix for papr reduction and a SI matrix for side information hiding. We proposed a semi-hadamard matrix generation method to generate the phase rotation matrix, and designed a cyclic shift matrix as the SI matrix. Compared with the traditional HSLM, the semi-HSLM saves half of the phase storage and achieves good papr reduction performance.

关键词： OFDM papr SLM SI Hadamrd

Threshold-based piecewise companding transform for papr reduction in OFDM systems

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The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 1-6,18页

作者： LIU Shu-hua LI Yong-zhao ZHANG Hai-lin LIU Ying-ting Sate Key Laboratory of Integrated Service Network 119# Xidian University Information and Communication Company of Gansu Electric Power Corporation

Piecewise companding transform is a flexible and efficient way to solve the high peak-to-average power ratio （papr） problem for orthogonal frequency division multiplexing （OFDM） systems. A novel threshold-based piecewise companding transform is proposed in this paper. Based on the statistical characteristics of amplitudes, OFDM signals are classified into three groups （i.e., small, average and large signals）. Different from conventional approaches, two dedicated designed thresholds are set to amplify the small signals and compress the large signals, respectively. Simulation results verify the improvement in papr reduction of the proposed scheme. Moreover, a lower bit error rate （BER） performance loss can be obtained by introducing the iterative detection with a moderate increase in complexity.

关键词： OFDM papr companding transform iterative detection

An Efficient Hybrid papr Reduction for 5G NOMA-FBMC Waveforms

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Computers, Materials & Continua 2021年第12期69卷 2967-2981页

作者： Arun Kumar Sivabalan Ambigapathy Mehedi Masud Emad Sami Jaha Sumit Chakravarty Kanchan Sengar Department of Electronics and Communication Engineering JECRC UniversityJaipur303905India Center for System Design Chennai Institute of TechnologyIndia Department of Computer Science College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Computer Science Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Electrical and Computer Engineering Kennesaw State UniversityGAUSA

The article introduces Non-Orthogonal Multiple Access(NOMA)and Filter Bank Multicarrier(FBMC),known as hybrid waveform(NOMAFBMC),as two of the most deserving contenders for fifth-generation(5G)*** spectrum access and clampdown of spectrum outflow are unique characteristics of hybrid *** compare the spectral efficiency of Orthogonal Frequency Division Multiplexing(OFDM),FBMC,NOMA,and *** is seen that the hybrid waveform outperforms the existing *** to Average Power Ratio(papr)is regarded as a significant issue in multicarrier *** combination of Selective Mapping-Partial Transmit Sequence(SLM-PTS)is an effective way to minimize large peak power *** SLM,PTS,and SLM-PTS procedures are applied to the NOMA-FBMC *** hybrid structure is applied to the existing ***,the correlated factors like Bit Error Rate(BER)and Computational Overhead(CO)are studied and computed for these *** outcome of the work reveals that the NOMA-FBMC waveform coupled with the SLM-PTS algorithm offers superior performance as compared to the prevailing systems.

关键词： 5G NOMA-FBMC SLM-PTS papr BER OFDM

Low papr Channel Estimation for OTFS with Scattered Superimposed Pilots

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China Communications 2023年第1期20卷 79-87页

作者： Wei Liu Liyi Zou Baoming Bai Teng Sun State Key Labs of Integrated Service Networks Xidian UniversityXi’an 710071China The 54th Research Institute of CETC Shijiazhuang Hebei 050081China

Orthogonal time frequency space(OTFS)modulation has been proven to be superior to traditional orthogonal frequency division multiplexing(OFDM)systems in high-speed communication ***,the existing channel estimation schemes may results in poor peak to average power ratio(papr)performance of OTFS system or low spectrum ***,in this paper,we propose a low papr channel estimation scheme with high spectrum ***,we design a multiple scattered pilot pattern,where multiple low power pilot symbols are superimposed with data symbols in delay-Doppler ***,we propose the placement rules for pilot symbols,which can guarantee the low ***,the data aided iterative channel estimation was invoked,where joint channel estimation is proposed by exploiting multiple independent received signals instead of only one received signal in the existing scheme,which can mitigate the interference imposed by data symbols for channel *** results shows that the proposed multiple scattered pilot aided channel estimation scheme can significantly reduce the papr while keeping the high spectrum efficiency.

关键词： OTFS channel estimation superimposed pilots papr interference mitigation

papr reduction based on improved Nyquist pulse shaping technology in OFDM-RoF systems

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Optoelectronics Letters 2013年第1期9卷 57-60页

作者：刘剑飞李宁卢嘉曾祥烨李洁王蒙军 School of Information Engineering Hebei University of Technology

High peak-to-average power ratio (papr) is the main disadvantage in orthogonal frequency-division multiplexing (OFDM) communication systems, which also exists in OFDM-radio over fiber (RoF) systems. In this paper, we firstly analyze the impact of high papr on a 40 GHz OFDM-RoF system, and then describe the theory of Nyquist pulse shaping technology for reducing papr. To suppress papr further, an improved Nyquist pulse shaping technology is proposed, in which the distribution of original-data amplitude is changed by properly selecting the time-limited waveforms of the different subcarriers. We firstly apply the improved Nyquist pulse shaping technology to an OFDM-RoF system. The simulation results show that papr is effectively reduced by more than 2 dB with the bit error rate (BER) declining by about 0.125%.

关键词： papr 奈奎斯特成形技术 F系统脉冲正交频分复用 OFDM 整形技术