一种降低OFDM/OQAM系统峰均比的C-OSLM联合算法

摘要

针对正交频分复用/交错正交幅度调制(OFDM/OQAM)系统由多个子信道叠加而引起高峰均比的问题,提出了一种基于OFDM/OQAM系统的重叠选择映射与限幅联合算法(C-OSLM).该算法基于改进型重叠选择映射法(IOSLM)以两种方式引入限幅法,同时对码字数、限幅率(CR)进行优化以保证在误码率不变的条件下提升峰均比抑制性能.仿真结果表明,C-OSLM算法在保证OFDM/OQAM系统误码性能的同时,大幅降低了峰均比.%In order to solve the problem of the OFDM/OQAM's high Peak-to-Average Power Ratio(PAPR)caused by sub-channels'overlapping, a hybrid PAPR reduction algorithm called Clipping-OSLM(C-OSLM)is proposed. Based on an Improved Overlapped Selective Mapping(IOSLM)method, this algorithm introduces the clipping in 2 ways to jointly reduce PAPR, and optimizes Clipping Rate(CR)and number of codes by considerably reducing the PAPR in OFDM/OQAM without deteriorating the error rate. The simulation results indicate that, C-OSLM can make a sharp fall in PAPR in OFDM/OQAM, meanwhile, the BER performance can be well protected.