为了降低正交频分复用系统中的峰均功率比,在研究部分传输序列技术的基础上,给出了一种相位集合元素个数为4时的降低穷尽搜索复杂度的算法.该方法在没有减少备选相位旋转序列数目的情况下,利用在元素均匀分布的相位集合中取值所产生的备选相位序列之间的关系特性,去除不必要的计算冗余来寻找最优的相位旋转序列.复杂度分析和仿真结果表明,与传统的穷尽搜索方法相比较,该方法能较大地降低计算复杂度,且不会影响降低峰均比的性能.%In order to reduce the peak-to-average power ratio( PAPR) in orthogonal frequency division multiplexing ( OFDM) systems, this paper proposed a low complexity algorithm of exhaustive search in the case of four elements in the phase set based on the research of partial transmit sequence ( PTS) technique. In this method, using of the relationship between candidate phase rotation sequences taking on values from the phase set whose elements were uniformly distribution,removed unnecessary redundancy calculation and found the optimal phase rotation sequence in the case of no reducing the number of the candidate phase rotation sequences. Compared with the conventional exhaustive search method, the analysis of computational complexity and simulation results show that the method can reduce the computational complexity significantly and not affect the performance of PAPR reduction.
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