降低OFDM信号峰均比的PTS技术  

Overview of peak-to-average power ratio reduction techniques for OFDM signal using partial transmit sequences

作　　者：王林[1] 江秀萍[1] 

机构地区：[1]西安理工大学自动化学院,西安710048

出　　处：《计算机工程与应用》2007年第5期153-158,共6页Computer Engineering and Applications

摘　　要：正交频分复用技术(OFDM)由于具有较高的频谱利用率和较强的抗多径衰落能力,被看作第四代移动通信的核心技术之一,但是OFDM信号在传输过程中峰均比值(PAPR)较高。部分传输序列(PTS)方法通过选择合适的相位旋转因子序列以降低信号峰值出现的概率,从而降低OFDM信号的峰均比值,因此不会使信号发生畸变,但是传统的PTS技术计算复杂度太大,因而在保证有效降低OFDM信号峰均比的前提下大幅度降低传统PTS的复杂度就成为PTS技术实用化的关键。较为全面地讨论并比较了关于传统PTS的多种改进方案的特点,在此基础上阐明了PTS技术改进的发展趋势,期望能对PTS方法的进一步改进起到一定的作用。Orthogonal Frequency Division Multiplexing has been seen as one of the core techniques of 4G for its high spectral efficiency and good performance in fading radio channels.However,the major drawback of OFDM system is that the OFDM signal has high Peak to Average Power Ratio（PAPR）.The Partial Transmitted Sequences（PTS） scheme reduces the probability of the appearance of high peak value using a set of appropriate phase rotation vectors,so that the PAPR of a OFDM signal can be reduced without distortion of the signal.The conventional PTS scheme,due to its high computational complexity,cannot be implemented in real. communication systems,so,it is necessary to reduce the complexity of conventional PTS scheme while insure effective reduction of the OFDM signal＇s PAPR.In this paper,we discusse and compare the characteristics of various kinds of improved PTS schemes,and finally,point out the research trend of the PTS scheme.

关 键 词：正交频分复用技术 峰均比 部分传输序列 

分 类 号：TN915.04[电子电信—通信与信息系统]