LTE系统中采用SGA-PTS技术降低OFDM峰均比的研究与仿真  

Use of SGA-PTS to Restrain PAPR of OFDM in LTE System and Its Simulation

作　　者：杨桂芹[1] 赵春和 蒋占军[1,3] 

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070 [2]中铁工程设计咨询集团有限公司济南设计院,山东济南250022 [3]东南大学国家移动通信实验室,江苏南京210018

出　　处：《铁道学报》2014年第4期38-41,共4页Journal of the China Railway Society

基　　金：甘肃省教育厅高等学校研究生导师科研项目(1204-07)

摘　　要：LTE系统以OFDM技术为核心,但OFDM技术自身存在高峰均比的问题。随着硬件技术的迅速发展,概率类技术被认为是最有希望解决OFDM系统峰均比PAPR问题的一类方法。部分传输序列PTS(Partial Transmit Sequence)技术作为概率类技术中的代表技术一直广受关注,其关键问题在于搜索到合适的相位因子序列,使OFDM信号的峰均比性能最好。本文将混合的模拟退火遗传算法SGA(Simulated Annealing Genetic Algorithm)应用于PTS技术中相位因子序列的搜索,并通过仿真验证其有效性及优越性。对于相同的峰均比阈值要求,SGA算法能更好地改善PTS技术搜索最优相位因子序列的复杂度问题,使其更易于实现。With the OFDM technology as the core ,the LTE system is regarded as the ＆quot;Quasi 4G＆quot; technology . But the OFDM technology has its own problem of high PAPRs .Along with rapid development and mature of the hardware technology ,the probability techniques come out as the most promising way to solve the problem of PAPR restriction of OFDM .The PTS technique is representative of the probability techniques .The key problem of PTS is to search out the best phase factor sequence to decrease the PAPR .In this paper ,the hybrid simulated annealing genetic algorithm （SGA） was applied in searching of the best phase factor sequence .Simu-lation verified its effectiveness and superiority .For the same PAPR threshold requirements ,SGA can better improve the calculation complexity of PTS and achieve easier realization .

关 键 词：LTE系统 模拟退火遗传算法 部分传输序列 峰均比 SGA (simulated annealing genetic algorithm ) PTS (partial transmit sequence) PAPR(peak-to-average power ratio) 

分 类 号：TN919.3[电子电信—通信与信息系统]