东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (12): 1705-1708.DOI: -

• 论著 • 上一篇    下一篇

空时分组码在时变衰落信道中的性能

沙毅;门金玲;王经武;王光兴;   

  1. 东北大学信息科学与工程学院;东北大学信息科学与工程学院;鞍山挪洋科技有限公司;东北大学信息科学与工程学院 辽宁沈阳110004;辽宁沈阳110004;辽宁鞍山114044;辽宁沈阳110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-12-15 发布日期:2013-06-24
  • 通讯作者: Sha, Y.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金跨科学部交叉重点项目(10433020)

Performance of space-time block code in time-varying fading channel

Sha, Yi (1); Men, Jin-Ling (1); Wang, Jing-Wu (2); Wang, Guang-Xing (1)   

  1. (1) School of Information Science and Engineering, Northeastern University, Shenyang 110004, China; (2) Anshan Nuoyang Science and Technology Co. Ltd., Anshan 114044, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-12-15 Published:2013-06-24
  • Contact: Sha, Y.
  • About author:-
  • Supported by:
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摘要： 从实用性出发,对空时分组码在时变衰落信道中的性能进行了研究.采用SIMULINK仿真工具构造了时变衰落信道的仿真模型,模型由信道、发射端和接收端组成:信道部分由多径Rayleigh信道和高斯白噪声构成;发射端由信源、串并转换器、调制器、空时分组编码器和功率分配模块构成;接收端由信号合并、最大似然译码器、调制解调器和误比特率计算模块组成.仿真结果表明:在平坦慢衰落信道中,STTD性能比单收发系统的性能有很大提高,并且随着SNR的增大,STTD性能的提高幅度增大;在平坦时变衰落信道中,随着最大多普勒频移的增大,STTD性能有所下降,尤其是在大信噪比条件下,性能下降得更明显.

关键词: 编码, 空时分组码, 小尺度, 衰落信道, 时变慢衰落

Abstract: The performance of STBC (space-time block code) in time-varying fading channel is studied with its practicability in focus. A simulation model in time-varying fading channel is developed using SIMULINK, which consists a channel, transmitting end and receiving end. Further, the channel comprises a multipath Rayleigh channel and Gaussian white noise, the transmitting end comprises signal source, serial-parallel converter, modulator, STBC and power dividing block and the receiving end comprises signal combiner, maximum likelihood decoder, modem and BER computing block. Simulating results indicated that in a flat and slowly fading channel the performance of STTD (space-time transmit diversity) is much better than it in single transmitting/receiving case and can be improved quickly with increasing SNR. But, if in a flat time-varying fading channel, the performance of STTD degrades with increasing maximum Doppler shift especially in case of high SNR.

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