ACO-OFDM系统中一种改进的DST预编码峰均比抑制方法  

Improved DST precoding method for peak-to-average power ratio reduction in ACO-OFDM system

作　　者：袁建国[1] 李尚晋 赵富强 YUAN Jianguo;LI Shangjin;ZHAO Fuqiang(Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电信息感测与传输技术重庆市重点实验室,重庆400065

出　　处：《光通信技术》2020年第6期6-10,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(61971079、61671091)资助;重庆市基础与前沿研究计划项目(csts2017jcyjAX0427)资助。

摘　　要：针对可见光通信非对称削波光正交频分复用(ACO-OFDM)系统中峰均比(PAPR)较高的缺点,基于通用预编码(GP)方法提出一种改进的离散正弦变换GP(DST-GP)方法。该方法基于GP方法将DST矩阵扩展为非对称矩阵以获得更佳PAPR抑制性能,并根据GP方法优化了扩展部分的计算。仿真结果与分析表明:与DST方法相比,所提出的DST-GP方法以较低成本获得更佳PAPR抑制性能,并且取得PAPR抑制性能与计算复杂度之间的良好折中。Aiming at the disadvantage of the high peak-to-average power ratio(PAPR)in asymmetrically clipped optical orthog-onal frequency division multiplexing(ACO-OFDM)systems in visible light communication,an improved discrete sine transform(DST)generalized precoding(DST-GP)method based on the GP method is proposed.In this method,the DST matrix,based on the GP method,is extended into an asymmetric matrix to obtain the better PAPR reduction performance,and then the calculation of the extended part is optimized by the GP method.The simulation results and analyses show that the proposed DST-GP method,compared with the original DST method,has a better PAPR reduction performance with the low cost and can achieve a better compromise between the PAPR reduction performance and the computational complexity.

关 键 词：峰均比 通用预编码方法 离散正弦变换 复杂度 非对称削波光正交频分复用 

分 类 号：TN929.12[电子电信—通信与信息系统]