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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
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)
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
multi-carriers systems
peak to average pow er ratio（PAPR）
iterative clipping and filtering（ICF）
peak cancellation
zero-phase filter
