一种新的降低OFDM系统峰均功率比的压扩算法

摘要

To reduce the high peak-to-average power ratio(PAPR) in OFDM systems, this paper proposed a novel companding transform scheme. According to keep the middle signals unchanged, compress the large signals and enlarge the small signals, the novel algorithm improved the PAPR performance of OFDM systems. According to comparing with the existing companding scheme, illustrated the effect of proposed scheme on PAPR and BER in detail. The simulation results confirm that the suggested scheme can obtain better PAPR performance and has lower computational complexity.%为了降低OFDM信号峰均功率比,提出了一种新的压扩算法.新算法通过保持中值信号不变,压缩大信号,放大小信号,从而降低了OFDM信号峰均比.通过与现有压缩算法对比,分析了该算法对PAPR性能和系统误码率的影响.实验仿真结果说明,该算法可以获得更低的峰均比,降低计算复杂度.