基于峰值优化的改进PTS算法

针对正交频分复用系统的峰均功率比(peak-to-average power ratio,PAPR)较高的问题,提出基于峰值优化的部分传输序列(partial transmit sequence, PTS)算法。该算法通过分析每个采样位置的最大峰值功率出现的特点,对每个采样位置的最大峰值功率进行估计,得到采样点峰值功率的度量函数Pn,只对Pn大于等于预设阈值γ的点进行优化处理,降低了计算复杂度。提出的PTS算法与文献［20］相比,在计算复杂度和误码率性能基本相同的情况下,PAPR性能有一定程度的改善和提升。

Improved PTS scheme based on peak optimization

A partial transmit sequence (PTS) algorithm based on peak optimization is presented in terms of the defect of the high peak to average ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) systems. The algorithm estimates the maximum peak power of each sampling position by analyzing their characteristics and the metric function Pn is obtained. The computational complexity is reduced by optimizing the sample point where Pn is equal or to greater than the preset threshold γ. Compared with the PTS algorithm and the reference［20］, the PAPR performance, to a certain extent, is improved when the computational complexity and the bit error rate performance are almost the same.