MIMO-OFDM系统中降低PAPR的SLM算法的研究  

Research on SLM Algorithm for Reducing PAPR in MIMO-OFDM System

作　　者：罗菊 何庆 周晓南 LUO Ju;HE Qing;ZHOU Xiaonan(College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China;Editorial Department of Journal,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025 [2]贵州大学学报编辑部,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2019年第1期54-59,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目资助(61363028);贵州省科技计划项目重大专项资助(黔科合重大专项字[2018]3002);贵州省公共大数据重点实验室开放课题资助(2017BDKFJJ004);贵州省教育厅青年科技人才成长项目资助(黔科合KY字[2016]124);贵州大学培育项目资助(黔科合平台人才[2017]5788)

摘　　要：OFDM技术存在高峰均功率比(PAPR)问题,高PAPR要求系统功率放大器具备较大的线性放大范围以避免传输信号的频谱扩散和非线性失真,同时还会增加A/D和D/A转换器件的复杂度,导致系统性能严重下降。显而易见,作为MIMO技术和OFDM技术结合产物的MIMOOFDM系统也受到了高PAPR的影响。本文搭建了MIMO-OFDM仿真模型,实现了选择性映射(SLM)算法,并研究了不同序列数、不同调制方式对SLM算法的影响。仿真结果表明:随着序列数的增加,SLM算法的峰均功率比将会降低,但是其复杂度也会随之增大; QPSK调制降低系统PAPR的效果都最佳,其次是16QAM调制方式,而64QAM调制的效果最差。因此,在使用SLM算法时,增加序列数并且选用QPSK调制方式更利于降低MIMO-OFDM系统的PAPR值。The problem of high Peak to average Power Ratio(PAPR)occurs in the OFDM technology.The high PAPR requires the power amplifier in OFDM have a larger linear amplification range to prevent the spectrum spreading and nonlinear distortion of transmission signals.At the same time,high PAPR also increases the complexity of A/D and D/A converters,resulting in a severe decline in system performance.Obviously,the MIMO-OFDM system that combines MIMO technology and OFDM technology is also affected by high PAPR.The paper built a basic model to simulate the MIMO-OFDM system in order to implement the selective mapping(SLM)algorithm.Moreover,the effects of different sequence numbers and different modulation methods on the SLM algorithm were studied.Simulation results show that with the increase of the sequence numbers,the PAPR of SLM algorithm decreases,and the complexity increases conversely.The QPSK modulation scheme works best on reducing the PAPR,followed by the 16 QAM modulation scheme and the 64 QAM modulation scheme.As a result,when the SLM algorithm is implemented,the increase of the sequence numbers and the selection of QPSK modulation will contribute to reducing PAPR in MIMO-OFDM system.

关 键 词：MIMO-OFDM 峰均功率比 选择性映射 

分 类 号：TN929.5[电子电信—通信与信息系统]