降低WOFDM系统PAPR的改进PTS-μ律算法

摘要

Wavelet-based orthogonal frequency division multiplexing (WOFDM) system has the problem of high peak-to-average ratio(PAPR).Aiming at the high computational complexity and low bit error (BER) performance of the traditional technique to reduce PAPR,a PAPR reduction algorithm using improved partial transmit sequence (PTS) technology and μ-law companding method is proposed in the paper.Simulation results show that the improved PTS technology greatly reduces the computational complexity with only a little PAPR performance lost compared to the traditional technology.Combining improved PTS technology with μ-law companding method,in the premise of low computational complexity,the PAPR value in WOFDM system reduces by 4.7 dB with only 1.4 dB BER lost.%基于小波变换的正交频分复用(WOFDM)系统存在较高的峰值平均功率比(PAPR),针对传统降低PAPR方法的高计算复杂度和低误码性能的问题,提出一种改进的部分传输序列(PTS)技术,并将其与μ律压扩进行联合处理.仿真结果表明,改进的PTS技术与传统方法相比,以牺牲少量的PAPR性能大大降低了系统的计算复杂度.经改进的PTS技术和μ律压扩联合处理,在计算复杂度不高的前提下,将WOFDM系统的PAPR值降低了4.7 dB,而误码性能仅损失1.4 dB.