降低OFDM系统峰均比的一类改进算法

A Class of Modified Algorithm for PAPR Reduction in OFDM

提出一类改进型算法来解决传统选择映射法不能完全抑制高PAPR信号的出现以及运算量很大的问题,从而保证OFDM系统能有较低的PAPR及其OFDM技术的实用性.新算法是一种结合了限幅法和改进SLM算法的复合型算法,计算机仿真结果证明:新方法不仅有效降低了OFDM系统的PAPR,而且运算量小,系统性能基本不受影响.

The traditional selective mapping （SLM） can reduce the probability of PAPR presence, but it cannot completely restrain the appearance of such a signal. Furthermore, it has high computational complexity. A kind of modified algorithm is proposed to solve these two problems. The new algorithms not only render a lower PAPR but also preserve the practicality of OFDM. Based on the limited amplitude method and modified SLM algorithm, the new algorithms are methods combining various types. Computer simulation results are provided to verify the efficiency of the proposed methods. The results indicate that the new methods can efficiently reduce PAPR, and have lower computational complexity and are irrelevant to other system performances.