基于循环迭代的部分传输序列峰均比降低算法  

PTS Peak to Average Power Ratio Reduction Algorithm Based on Cyclic Iteration

作　　者：高静[1] 汪晋宽[1] 解志斌[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《信号处理》2009年第11期1790-1793,共4页Journal of Signal Processing

基　　金：博士学科点专项科研基金(20050145019)

摘　　要：部分传输序列(PTS)算法能够有效的解决正交频分复用(OFDM)系统中的高峰均功率比(PAPR)问题,但是其复杂度非常高。针对该问题,提出了基于一种基于循环迭代的PTS(C-IPTS)算法。所提算法将前一次迭代搜索得到的相位因子作为当前搜索的初始值,经过循环,使其更加接近最优相位因子。同时采用Metropolis准则,避免了相位因子的搜索陷入局部极小值,为最优相位因子的搜索提供了更大的自由度空间,算法的峰均比性能显著提高。仿真结果证明,所提算法不仅能够保持较低的计算复杂度,而且可以获得良好的峰均比降低性能。Partial transmit sequence is an efficient algorithm to solve the problem of high peak-to-average power ratio （PAPR） in orthogonal frequency division multiplexing （ OFDM）, but it requires high computational complexity. A suboptimal PTS algorithm based on cyclic iteration （C-IPTS） is proposed to solve this problem. In the proposed algorithm,the phase factor achieved by the previous iteration is set as the initial phase factor of the current search,thus the search is more close to the optimal phase factor after repetition. Moreover,the Metropolis nile is adopted to avoid the search being trapped in a local optimum solution,which provides higher freedom for the search of optimal phase factor, as a result, the PAPR performance is improved significantly. Simulation shows that C-IPTS algorithm can achieve good PAPR reduction with low computational complexity.

关 键 词：正交频分复用 峰均功率比 部分传输序列 循环迭代 

分 类 号：TN911.7[电子电信—通信与信息系统]