降低MC-CDMA系统峰均比技术的研究

Research on PAPR Reduction in MC-CDMA System

选择映射法(SLM)是一种降低多载波码分多址(MC-CDMA)系统峰均比(PAPR)的方法。为了研究在SLM中,相位序列的选取对降低系统PAPR的影响。在对常见的几种序列进行介绍的基础上,采用它们作为系统的相位序列,并且进一步分析同一相位序列取不同长度和系统取不同相位序列个数集时的情况。仿真结果表明,在实际应用中,可以用Gold伪随机序列作为实际的相位序列;系统的PAPR随着所用相位序列长度的增加而增大;随着所用相位序列的个数集的增大而减小。

Selected mapping （SLM） is a method to reduce PAPR of MC -CDMA system . In order to study the impact of different phase sequences on the reduction of the PAPR in MC - CDMA system using SLM based on introducing some usually selected phase sequences, the paper point out that they can be used as the phase sequences of the MC -CDMA system, and further more analyzes the PAPR characteristics of the same phase sequence when its length is different or the number of the phase sequence set is different. Simulation results show that Gold - sequence can be used for the phase sequence in the actual system. For the same phase sequence, the shorter the phase sequence is the smaller the PAPR value will be; the larger the number of phase sequence is the smaller the PAPR value will be.