OFDM系统中基于压缩感知的非线性失真恢复研究

赵辉; 莫谨荣; 王薇; 孙振江; 张天骐

doi:10.11999/JEIT200374

OFDM系统中基于压缩感知的非线性失真恢复研究

doi: 10.11999/JEIT200374

1.
重庆邮电大学通信与信息工程学院重庆 400065
2.
重庆邮电大学信号与信息处理重庆市重点实验室重庆 400065

详细信息

作者简介:
赵辉：女，1980年生，教授，硕士生导师，研究方向为信号与图像处理

莫谨荣：男，1996年生，硕士生，研究方向为信号与图像处理、峰均比抑制、非线性失真恢复

王薇：女，1996年生，硕士生，研究方向为信号与图像处理、多载波调制技术

孙振江：男，1992年生，硕士生，研究方向为协作智能技术研究

张天骐：男，1971年生，博士后，教授，研究方向为通信信号的调制解调、盲处理、语音信号处理、神经网络实现以及FPGA、 VLSI实现

通讯作者:
赵辉　zhaohui@cqupt.edu.cn

中图分类号: TN919.3
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出版历程
- 收稿日期: 2020-05-12
- 修回日期: 2020-11-10
- 网络出版日期: 2020-12-09
- 刊出日期: 2021-07-10

Research on Nonlinear Distortion Recovery Based on Compressed Sensing in OFDM System

1.
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunication, Chongqing 400065, China
2.
Chongqing Key Laboratory of Signal and Information Processing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

摘要

摘要: 正交频分复用系统(OFDM)的高峰均比(PAPR)问题降低了系统传输效率，增加了解调难度，使高功率放大器(HPA)满负载工作。该文针对削波与HPA引入的非线性失真问题，提出在接收端采取基于泰勒级数的预处理方式对非线性干扰进行处理，最小化信号畸变影响。在发送端通过削波降低信号的PAPR，并利用削波噪声在时域上的稀疏性特性，将传输过程作为整体考虑，最后利用正交匹配追踪算法(OMP)恢复总的非线性失真信号。仿真结果表明，该文所提方法能够有效抑制系统的干扰信号，减少了有用信号受到的非线性影响，验证了该方案的正确性。
- 正交频分复用 /
- 压缩感知 /
- 峰均比 /
- 非线性失真
Abstract: The Peak to Average Power Ratio (PAPR) problem of OFDM system reduces the transmission efficiency of the system, increases the difficulty of demodulation, and makes the High Power Amplifier (HPA) to saturation. In order to solving the problem of nonlinear distortion caused by clipping and HPA, the proposed scheme uses preprocessing method based on Taylor series to deal with nonlinear interference so that to minimize the influence of signal distortion. At the transmitter, the PAPR of the signal is reduced by clipping, and the transmission process is considered as a whole based on the sparsity of clipping noise in the time domain. Finally, the total nonlinear distortion signal is recovered by using the Orthogonal Matching Pursuit (OMP) algorithm. The simulation results show that the proposed method can effectively suppress the interference signals of the system, reduce the nonlinear influence of useful signals, and verify the correctness of the scheme.
- Orthogonal Frequency Division Multiplexing(OFDM) /
- Compressive Sensing(CS) /
- Peak to Average Power Ratio(PAPR) /
- Nonlinear distortion

HTML全文

图 1 OFDM信号PAPR性能分析

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图 2 AWGN信道中不同削波比下算法的BER性能

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图 3 瑞利衰落信道下算法的BER性能

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参考文献(6)

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[5]	杨霖, 何向东, 丁长文. OFDM系统中基于限幅和压缩感知的非线性失真补偿算法[J]. 电子学报, 2016, 44(9): 2051–2056. doi: 10.3969/j.issn.0372-2112.2016.09.004 YANG Lin, HE Xiangdong, and DING Changwen. Compensation method for nonlinear distortion based on clipping and compressive sensing in OFDM system[J]. Acta Electronica Sinica, 2016, 44(9): 2051–2056. doi: 10.3969/j.issn.0372-2112.2016.09.004
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