在多径衰落信道下FD/SSMA系统的性能分析

多载波频率分集扩展频谱码分多址系统（ＦＤ／ＳＳＭＡ）是一种基于多载波传输，与直接序列扩展频谱码分多址系统（ＤＳ／ＳＳＭＡ）存在时间－频率对偶关系的扩频多址通信方案。在多径传输信道下，基于ＦＤ／ＳＳＭＡ信号的锐自相关和低互相关特性，本文提出ＦＤ／ＳＳＭＡ系统可以采用路径分集接收的方案。分析和模拟计算表明，在多径衰落信道下，采用路径分集方案时ＦＤ／ＳＳＭＡ系统的性能将得到明显的改善。

Analysis and Performance of FD/SSMA Communication System over Multipath Fading Channels

FD/SSMA system ( Frequency Diversity Spread Spectrum Multiple Access ) is new scheme of spread spectrum system , which is based on the theory of orthogonal multicarrier technique and the time/frequency duality with DS/SSMA system . A RAKE receiver scheme is proposed for FD/SSMA system over multipath fading channels , which is based on the feature of autorelation and crosscorrelation of the FD/SSMA signal . It is shown by analyzing and simulating that the performance of FD/SSMA system over multipath fading channel will be improved great when the RAKE scheme is adopted in the receiver .