LTE-A中逼近最优性能的峰值对消峰均比抑制算法  

A Peak Cancellation Method Close to Optimal Performance for PAPR Reduction in LTE-A System

作　　者：潘文生[1] 朱晓东[1] 邵士海[1] 唐友喜[1] 

机构地区：[1]电子科技大学通信抗干扰国家级重点实验室,四川成都611731

出　　处：《电子学报》2014年第10期1901-1906,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61101034;No.61001087;No.61271164)

摘　　要：最优化限幅滤波法(OICF)是一种最优化的限幅类技术,它可以在满足峰均比(PAPR)要求下实现信号矢量误差的最小化,但其需要进行最优化求解,其计算复杂度与信号的子载波总数的立方成正比.针对OICF复杂度高的缺点,考虑LTE-Advanced多载波信号,提出了一种基于峰值对消降低PAPR的方法(PC-PAPR).PC-PAPR在峰值对消前,将对消脉冲通过一个零相位滤波器,滤除带外泄漏的同时,保证对消脉冲的相位不发生改变.理论分析表明,PC-PAPR计算复杂度降至与信号的子载波总数成正比,数字仿真结果表明PC-PAPR降低PAPR的性能与OICF性能差异小于0.06d B.Optimized iterative clipping filtering（ OICF） is an optimal algorithm for peak to average pow er ratio（ PAPR） reduction,since it can achieve the required PAPR reduction with minimum in-band distortion.However,OICF needs to solve a convex optimization problem with O（ N3） complexity,where N is the number of subcarriers.To reduce the complexity,a method based on the peak cancellation（ PC-PAPR） is proposed.This method uses a zero-phase filter,which length is Q,to modify the spectrum of the peak pulse.After the filter,the phase of the peak pulse is not changed,and the out-of-band spectrum of the pulse is zero.Results of analysis show that the computational complexity of the PC-PAPR is O（ QN）,and simulation results show that the difference of PAPR-reduction performance between PC-PAPR and OICF is less than 0.06 d B.

关 键 词：多载波系统 峰均功率比 限幅滤波 峰值对消 零相位滤波器 

分 类 号：TN919.72[电子电信—通信与信息系统]