基于DFT-GCS的ACO-OFDM系统PAPR抑制算法  

DFT-GCS based PAPR suppression algorithm for ACO-OFDM system

作　　者：孙怡菲 赵庆敏[1] SUN Yifei;ZHAO Qingmin(Department of Electronic Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学电子工程系,江西南昌330031

出　　处：《现代电子技术》2016年第15期1-4,共4页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(11202093);江西省软科学研究计划项目(20133BBA10026)

摘　　要：针对ACO-OFDM系统的信号特点,提出了一种基于DFT和GCS相结合的PAPR抑制算法。该方法首先利用DFT预编码降低调制符号之间的相关性,从而达到抑制PAPR的目的。然后将预编码信号进行子块分割,并对其执行分组循环移位(GCS)算法以进一步抑制PAPR。当每次循环得到的PAPR小于预先设定的阈值时,算法则停止迭代以降低计算复杂度。仿真结果表明提出的算法比仅采用DFT预编码或GCS算法具有更低的PAPR。According to the signal characteristics of ACO?OFDM system,a PAPR suppression algorithm combining discreteFourier transform(DFT)and grouping cyclic shifting(GCS)is proposed. In the method,the DFT precoding is used to reducethe correlation among the modulated symbols to suppress the PAPR preliminarily. And then the precoding signal is segmented in?to subblocks,and the GCS algorithm is performed for the subblocks to further suppress the PAPR. When the PAPR obtained ineach circulation is less than the preset threshold,the algorithm will stop iteration so as to reduce the computation complexity.The simulation results show that the proposed algorithm has lower PAPR than the algorithm only using traditional DFT precodingor GCS algorithm.

关 键 词：可见光通信 ACO.OFDM DFT预编码 GCS算法 PAPRTN911.23.34 

分 类 号：TN911.23[电子电信—通信与信息系统]