机构地区: 东南大学信息科学与工程学院无线电工程系
出 处: 《电子科技大学学报》 1996年第4期347-352,共6页
摘 要: 将高效网格编码调制(TCM)应用于室内慢衰落信道下的直接序列扩频多址(DS/SSMA)系统中,提出了一种分析TCMDS/SSMA系统性能的方法。理论分析和模拟表明,在系统用户数、用户信源比特速率和伪码周期相同的前提下,通过消除并行路径和增大最短错误分支长度等适当编码方法,采用低码率TCM的DS/SSMA系统较与Ungerboeck型TCM相结合的DS/SSMA系统具有更好的性能。 In this poper,trellis-coded modulation(TCM)is applied to direct sequence spread spectrum multiple access (DS/SSMA) system under indoor slow Rayleigh fading channels.A new method is proposed to analyze the performance of TCM DS/SSMA in this channels theoretically.It is shown by computer simulation that the performances of DS/SSMA system with TCM of lower coding rate in fading channel are better than those of the systems with traditional TCM of Ungerboeck type by means of increasing the length of the shortest error path.