SC-FDMA系统中基于非线性压扩的峰均功率比降低方法  

Non-linear companding schemes for peak-to-average power ratio reduction of SC-FDMA system

作　　者：梁燕[1] 蒋漓[2] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2012年第4期416-419,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(61071195);中芬国际合作项目(1018)~~

摘　　要：针对单载波频分多址接入(single carrier frequency division multiple access,SC-FDMA)系统在在多用户的情况下依然存在较高峰均比(peak to average power ratio,PAPR)问题,提出采用正交频分多址接入(orthogonal frequency di-vision multiple access,OFDMA)系统中的μ律压扩和指数压扩2种非线性压扩方法来降低SC-FDMA系统的PAPR。仿真结果表明,这两种压扩方案能有效地降低SC-FDMA系统的PAPR,并且指数压扩方案比律压扩方案能更有效地降低系统的PAPR。同时,对信号的压扩变化将影响到系统的误码率(bit error ratio,BER):当信噪比条件较差时,两种压扩变化均改善了SC-FDMA系统的BER;但是随着信噪比的提高,使用这两种压扩方案会带来系统的BER性能损失。For considering the issue that SC-FDMA system till suffers large PAPR in the multiuser situation, we try to apply two non-linear companding schemes ,μ-law and Exponential Companding （EC） , which were usually used to reduce the PAPR in the OFDMA system, in the SC-FDMA system to further reduce the PAPR. Computer simulation results show that both of them can offer clear PAPR reduction in the SC-FDMA system and the EC companding has better result than μ-law companding. Meantime, the companding brings some influences to BER performance： both eompanding schemes improve the performance of BER at the worse SNR; however, with the increasing SNR there are some BER performances lost.

关 键 词：单载波频分多址接入(SC-FDMA) 非线性压扩 峰均比(PAPR) 

分 类 号：TN929[电子电信—通信与信息系统]