抑制OFDM系统峰均比的DHT-SCF联合算法  

Joint DHT-SCF Algorithm for Suppression in OFDM Systems

作　　者：杨小鋆 李蠡[1] YANG Xiaojun;LI Li(College of Communication Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学通信工程学院,四川成都610225

出　　处：《成都信息工程大学学报》2021年第3期259-263,共5页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(61601065)。

摘　　要：针对正交频分复用(OFDM)系统PAPR较高及传统PAPR抑制算法固有缺陷的问题,提出用离散Hartley变换(DHT)和简化限幅滤波算法(SCF)的联合算法抑制PAPR。此算法在时域和频域上分别对OFDM信号进行不同的处理,在时域上先进行DHT变换,原始数据与变换矩阵相乘后使新数据序列有更低的非周期自相关性,降低大峰值信号出现的概率。在频域上,运用SCF算法对信号进行限幅滤波,达到进一步抑制系统峰均比的目的。实验表明,所提算法在保证BER性能的前提下,能达到4次传统迭代限幅滤波PAPR抑制效果且其计算复杂度远远小于4次传统迭代限幅滤波算法。In order to solve the problem of high PAPR in orthogonal frequency division multiplexing(OFDM)system and the inherent defects of traditional PAPR suppression algorithm,a joint algorithm of discrete Hartley transform(DHT)and simplified clipping filter(SCF)is proposed to suppress PAPR in this paper.In this algorithm,the OFDM signal is processed differently in time domain and frequency domain.Firstly,DHT transform is carried out in time domain.After the original data is multiplied by the transformation matrix,the new data sequence will have lower aperiodic autocorrelation and the probability of large peak signal will be reduced.In the frequency domain,the SCF algorithm is used to limit the amplitude of the signal to further suppress the PAPR of the system.Experimental results show that the proposed algorithm can achieve the PAPR suppression effect of four times traditional iterative limiting filter under the premise of ensuring BER performance,and its computational complexity is far less than that of the four times traditional iterative limiting filtering algorithm.

关 键 词：无线通信 OFDM 峰均比 离散Hartley变换 简化限幅滤波算法 

分 类 号：TN929.5[电子电信—通信与信息系统]