J4 ›› 2011, Vol. 38 ›› Issue (5): 172-177.doi: 10.3969/j.issn.1001-2400.2011.05.028

• 研究论文 • 上一篇    下一篇

双瑞利衰落对传输系统性能的影响

李兆训;胡捍英;任修坤;曹文魁   

  1. (解放军信息工程大学 信息工程学院,河南 郑州  450002)
  • 收稿日期:2010-08-27 出版日期:2011-10-20 发布日期:2012-01-14
  • 通讯作者: 李兆训
  • 作者简介:李兆训(1968-),男,副教授,解放军信息工程大学博士研究生,E-mail: lizxun@126.com
  • 基金资助:

    国家重大专项资助项目(2009ZX03003-008-02)

Influences of double-Rayleigh fading on transmission system performance

LI Zhaoxun;HU Hanying;REN Xiukun;CAO Wenkui   

  1. (College of Info. Eng., PLA Information Eng. Univ., Zhengzhou  450002, China)
  • Received:2010-08-27 Online:2011-10-20 Published:2012-01-14
  • Contact: LI Zhaoxun

摘要:

基于接收信噪比的统计特性,研究了双瑞利衰落下传输系统的差错性能,分析了系统的中断概率和分集增益.采用基于矩生成函数的方法导出了涵盖多种调制方式的平均误符号率的通用公式,并得到了二进制调制平均误符号率的封闭表示式.仿真结果表明: 相对于瑞利衰落而言,双瑞利衰落时系统的中断和平均误符号率性能变差,从而进一步限制了信息速率| 在有限的信噪比范围内,接收机难以获得满分集增益1| 采用差分相干M-DPSK比相干M-PSK约有3dB的性能损失.

关键词: 双瑞利衰落, 信噪比, 中断概率, 平均误符号率, 分集增益, 矩生成函数

Abstract:

Based on statistical properties of the receiving signal-to-noise ratio (SNR), the paper investigates error performance of the transmission system in double-Rayleigh fading. It analyses the outage probability and diversity gains of the system. A generalized formula for the average symbol error rate (ASER) of various M-ary modulations is derived by the moment generating function based approach and closed-form expressions for ASER for binary modulations are obtained. Simulation results show that, compared to Rayleigh fading, the outage performance and ASER in double-Rayleigh fading become worse than those in Rayleigh fading and the information rate is further limited consequently. The full diversity gain of unity in achievable SNR regions is difficult to acquire at the receiver under double-Rayleigh fading conditions. About 3dB SNR losses on system performance are induced by differentially coherent M-DPSK compared to coherent M-PSK.

Key words: double-Rayleigh fading, signal-to-noise ratio, outage probability, average symbol error rate, diversity gain, moment generating function

中图分类号: 

  • TN911.3