一种适合多载波码分多址系统的扩频序列  

A Spread Spectrum Sequence for MC-CDMA System

作　　者：张志成[1] 黄小娜[1] 熊丽[1] 

机构地区：[1]河西学院物理与机电工程学院,张掖734000

出　　处：《电信科学》2015年第11期56-62,共7页Telecommunications Science

摘　　要：多载波码分多址(MC-CDMA)技术结合了正交频分复用(0FDM)技术和码分多址(CDMA)技术的优点,具有数据传输速率高、频谱利用率高、抗干扰能力强和系统容量大的优点,是现阶段备受瞩目的一种无线通信方式。由于该通信系统中的码分多址技术结合了多载波调制技术,所以要求该系统中使用的扩频序列在兼具良好的自相关、互相关特性的同时,还要有较低的峰均比,这对扩频序列的设计提出了较高的要求。为了满足上述要求,设计了一种以Golay码为基础码,以m序列对Golay码进行加扰的扩频序列,该扩频序列具有良好的自相关、互相关特性,且峰均比较低。通过对比仿真验证,证明了本文中设计的扩频序列具有良好的特性,适用于MC-CDMA系统。The MC-CDMA system takes the advantages of the OFDM system and the CDMA system. The MC-CDMA system is a kind of wireless communication aroused an ongoing and growing research interests, which has the characteristics of high bit transmission rate, high bandwidth efficiency, anti-jamming, and a large system capacity. Since the MC-CDMA system includes the multi-cartier modulation, it is difficult to design a spread spectrum sequence performing not only a high level of self-correlation and cross-correlation but also a low peak-to-average power ratio in the MC-CDMA system. To solve this problem, a spread spectrum sequence which was modulated by Golay code and m sequence was proposed. The spread spectrum sequence proposed owned a good performance in self-correlation, cross-correlation and peak-to-average power ratio. The simulation results show the effectiveness and the superiority of the proposed spread spectrum sequence.

关 键 词：MC-CDMA 扩频序列 GOLAY码 M序列 

分 类 号：TN929.533[电子电信—通信与信息系统]