| 低码率TCMDS／SSMA系统在衰落信道下的性能 |
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| 引用本文： | 仰枫帆,毕光国. 低码率TCMDS／SSMA系统在衰落信道下的性能[J]. 电子科技大学学报(社会科学版), 1996, 0(4) |
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| 作者姓名： | 仰枫帆 毕光国 |
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| 作者单位： | 东南大学无线电工程系 |
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| 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。
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| 关 键 词： | 网格编码调制，直接序列扩频多址，瑞利衰落，多值正交幅度调制 |
Performance of DS/SSMA System with TCM of Lower Coding Rate in Fading Channels |
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| Yang Fengfan, Bi Guangguo. Performance of DS/SSMA System with TCM of Lower Coding Rate in Fading Channels[J]. Journal of University of Electronic Science and Technology of China(Social Sciences Edition), 1996, 0(4) |
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| Authors: | Yang Fengfan Bi Guangguo |
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| Abstract: | 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. |
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| Keywords: | trellis-coded medulation direct sequence spread spectrum multiple access Rayleigh feing multiple quadrature amplitude modulation |
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