一种低峰均比SCMA多址方案  

A SCMA Multiple Access Scheme with Low PAPR

作　　者：王雨晴 王力男[1] WANG Yuqing;WANG Li’nan(The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所

出　　处：《无线电通信技术》2019年第5期530-535,共6页Radio Communications Technology

基　　金：国家民用航天技术预先研究项目(D040202)

摘　　要：稀疏码多址接入(Sparse Code Multiple Access,SCMA)作为一种新型非正交多址接入技术,具备一定的过载能力,满足5G无线通信网络海量连接等需求。SCMA系统通常将用户码字映射到OFDM子载波上,具有与OFDM信号相似的高峰均比(Peak to Average Power Ratio,PAPR)特性。针对复用OFDM子载波SCMA系统具有高PAPR的特点,提出了一种低峰均比的SCMA多址方案,采用SC-FDMA技术,并进一步利用峰均比抑制技术对PAPR进行降低。理论和仿真结果表明,该算法能在PAPR性能、BER性能和系统复杂度间获得较好的权衡。As a new non-orthogonal multiple access technology,Sparse Code Multiple Access(SCMA)has overload capacity and can meet the requirements of massive connection of 5G wireless communication network.The user codewords are usually mapped to the OFDM subcarriers in the SCMA system,therefore it has a similar high Peak-to-average Power Ratio(PAPR)characteristic to that of the OFDM signal.Aiming at the characteristic of high PAPR for SCMA systems with OFDM subcarriers,a SCMA multiple access scheme with low PAPR is proposed.The scheme uses the SC-FDMA technology and the peak-to-average ratio suppression technique to further reduce the PAPR.The theoretical and simulation results show that the algorithm can get a good trade-off between PAPR performance,BER performance and system complexity.

关 键 词：稀疏码多址接入 峰均比 OFDM SC-FDMA 

分 类 号：TN929.5[电子电信—通信与信息系统]