改进迭代限幅滤波TDCS峰均比抑制算法  

Improved iterative clipping and filtering method for TDCS PAPR reduction

作　　者：李夏昭 任清华[1] 孟庆微[1] Li Xiazhao;Ren Qinghua;Meng Qingwei(College of Information&Navigation,Air Force Engineering University,Xi’an 710077,China)

机构地区：[1]空军工程大学信息与导航学院

出　　处：《计算机应用研究》2019年第12期3827-3829,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目;国家重点实验室合作基金资助项目

摘　　要：针对现有变换域通信系统存在较高峰均比及传统迭代限幅滤波算法峰均比收敛缓慢的问题,提出了改进迭代限幅滤波变换域通信信号峰均比抑制算法。该算法通过引入限幅噪声,对其进行滤波,减少峰均比回升的同时有效消除带外频谱扩散,并在迭代过程中获得更好的峰均比抑制效果。仿真结果表明,该算法一方面能获得更好的峰均比抑制效果,一次迭代较传统算法获得约1 d B的性能增益,三次迭代效果优于传统算法四次迭代;另一方面改善带外频谱性能,加入滤波后降低带外频谱功率约5 d B。误码率的对比结果表明,改进算法所损失的系统传输性能非常低。For the problem of high peak-to-average power ratio( PAPR) of transform domain communication system( TDCS)and the slow convergence of the PAPR of the traditional iterative clipping and filtering method,this paper proposed an improved iterative clipping and filtering method for TDCS signal PAPR reduction. By filtering the clipping noise introduced,this method reduced the PAPR regrowth and effectively eliminated out-of-band spectrum spread,and got better PAPR suppression effect in iteration. The simulation results show that on the one hand,this method can obtain better PAPR suppression effect,the first iteration can obtain about 1 dB performance gain compared with the traditional method and the third iteration has better performance than the fourth iteration of traditional method. On the other hand,it can improve the out-of-band spectrum performance,after filtering,the out-of-band spectrum power reduces by about 5 dB. The comparison of BER shows that the performance of system lost by the improved method is very low.

关 键 词：变换域通信系统 峰均比 改进迭代限幅滤波 

分 类 号：TN911.4[电子电信—通信与信息系统]