降低OFDM系统峰均比的PTS重复搜索算法

摘要

Orthogonal Frequency Division Multiplexing(OFDM)systems are prone to the problem of high Peak to Average Power Ratio(PAPR)when the plurality of sub-carrier signal is superimposed onto output. Aiming at this problem, this paper studies the reason of the problem of Peak to Average Power Ratio in the system, compares the existing two probability suppressing the peak to average power ratio technology by simulation method and proposes a new duplicate search algorithm based on Partial Transmit Sequence(PTS)technique for PAPR reduction. The method uses a repeating block search method for a second search of the optimal phase sequence. Simulation results show that the algorithm can achieve good PAPR reduction with low computa-tional complexity.%　　针对正交频分复用（OFDM）系统在多个子载波信号叠加输出时，容易出现高峰值平均功率比的问题。研究了系统中出现过高峰均功率比的原因，并对现有两种概率类抑制峰均功率比技术进行了相关仿真比较。提出了一种基于部分传输序列技术的抑制PAPR重复搜索算法。该方法采用重复分块搜索方法，对最优的相位序列进行二次搜索。仿真结果证明，与传统PTS算法相比较，改进算法能够在搜索复杂度较低的情况下，获得良好的峰值平均功率比降低性能。