利用SLM-DCT联合算法降低离散多音调制系统的峰均比

Using SLM-DCT Combined Algorithm to Reduce the Peak-to-average Power Ratio of DMT System

提出了将离散余弦变换(DCT)和选择性映射(SLM)算法进行级联的联合算法来降低离散多音调制(DMT)系统的峰均比(PAPR)。该联合算法先利用SLM算法对DMT信号进行处理以降低PAPR,所得信号再利用DCT变换进行处理,以进一步降低PAPR;并在降低PARR的基础上,研究了DCT变换和SLM算法之间的联合准则,比较了两种可行的联合算法DCTSLM和SLM-DCT之间的性能差异,得到了联合时的最佳级联顺序。应用Matlab软件进行仿真,结果表明SLM-DCT是较优的联合算法,能够最大限度地降低DMT系统的峰均比。

A combined algorithm of discrete cosine transform （DCT） and selective mapping （SLM） algorithm is proposed to reduce the peak-to-average-power ratio （PAPR） in the discrete multitone modulation （DMT） system. Firstly, the combined algorithm used SLM to process DMT signal to reduce PAPR, then the resulting signal is further processed by DCT to reduce PAPR. And on the basis of decreasing PARR, it studies the combined standards be- tween DCT transform and SLM algorithm, compares the performance difference between two kinds of feasible com- bined algorithm of DCT-SLM and SLM-DCT to to simulate, results show that SLM-DCT is the system. get the optimum combination of the cascade sequence. Using Matlab better combined algorithm, and can reduce efficiently PAPR of DMT