电子学报 ›› 2016, Vol. 44 ›› Issue (9): 2051-2056.DOI: 10.3969/j.issn.0372-2112.2016.09.004

• 学术论文 • 上一篇    下一篇

OFDM系统中基于限幅和压缩感知的非线性失真补偿算法

杨霖1,2, 何向东1, 丁长文1   

  1. 1. 电子科技大学通信抗干扰技术国家级重点实验室, 四川成都 611731;
    2. 中国电子科技集团公司第五十四所通信网信息信传输与分发技术重点实验室, 河北石家庄 050081
  • 收稿日期:2015-03-16 修回日期:2015-10-12 出版日期:2016-09-25 发布日期:2016-09-25
  • 通讯作者: 杨霖
  • 作者简介:何向东 男,1991年生于重庆,现为电子科技大学通信抗干扰技术国家级重点实验室硕士研究生.主要研究方向为现代通信中的信号处理,OFDM信号的峰均比抑制,功率放大器的非线性抑制等.E-mail:984078297@qq.com
  • 基金资助:

    国家自然科学基金(No.61370012);国家科技重大专项课题(No.2014ZX03004003-001)

Compensation Method for Nonlinear Distortion Based on Clipping and Compressive Sensing in OFDM System

YANG Lin1,2, HE Xiang-dong1, DING Chang-wen1   

  1. 1. Key Laboratory of National Communication Technology, University of Electronic Science and Technology, Chengdu, Sichuan 611731, China;
    2. Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory, The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang, Hebei 050081, China
  • Received:2015-03-16 Revised:2015-10-12 Online:2016-09-25 Published:2016-09-25

摘要:

正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)信号具有较高的峰均功率比(Peak to Average Power Ratio,PAPR),不仅影响功率放大器(High Power Amplifier,HPA)的工作效率,而且HPA使得OFDM信号产生严重的非线性失真,导致系统的误比特率(Bite Error Rate,BER)增大.本文基于限幅和压缩感知(Compressive Sensing,CS)提出了改进的补偿算法,发送端采用限幅降低信号的PAPR,接收端首先采用改进的逆模型方式减小HPA引入的非线性失真,再采用CS抵消由限幅引入的信号失真.仿真表明,所提方法不仅明显降低了OFDM信号的PAPR,而且有效提高了系统的BER性能.

关键词: 正交频分复用, 峰均比, 限幅, 非线性失真补偿, 压缩感知

Abstract:

The high peak to average power rate (PAPR) of orthogonal frequency division multiplexing (OFDM) signal reduced the efficiency of the high power amplifier (HPA),and led the OFDM signal suffered from nonlinear distortion caused by HPA and the bite error rate (BER) of the system became worse.This paper proposes a nonlinear distortion compensation method based on clipping and compressive sensing.The transmitter uses a clipping method to reduce the PAPR of OFDM signal;the receiver utilizes a modified method based on the inverse model of HPA to reduce the nonlinear distortion caused by the HPA,and applies compressive sensing (CS) on counteracting the distortion caused by clipping.Simulations show that the proposed method can not only reduce the PAPR of the OFDM signal significantly,but also improve the BER performance of the system promisingly.

Key words: orthogonal frequency division multiplexing(OFDM), peak to average power ratio(PAPR), clipping, nonlinear distortion compensation, compressive sensing(CS)

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