电信科学 ›› 2013, Vol. 29 ›› Issue (2): 95-99.doi: 10.3969/j.issn.1000-0801.2013.02.017

• 研究与开发 • 上一篇    下一篇

双向频谱共享干扰下的认知中继系统性能分析

闫盛楠,孙洁娣   

  1. 燕山大学信息科学与工程学院 秦皇岛066004
  • 出版日期:2013-02-15 发布日期:2017-02-22
  • 基金资助:
    国家自然科学基金资助项目;国家自然科学基金资助项目

Performance Analysis of Cognitive Relay Systems with Mutual Spectrum-Sharing Interference

Shengnan Yan,Jiedi Sun   

  1. Co11ege of Information Science and Engineering,Yanshan University,Qinhuangdao 066004,China
  • Online:2013-02-15 Published:2017-02-22

摘要:

分析了认知中继系统中双向的频谱共享干扰。一方面,依据主用户的QoS(quality of service,服务质量)需求,限制认知用户对主用户的干扰;另一方面,在瑞利干扰信道条件下,建模主用户对认知用户的干扰。在此基础上,进行基于信干噪比的认知中继选择和性能分析,推导出认知中继系统中断概率的闭式表达式,并通过理论分析和仿真结果证明,随着主用户发射信噪比的增大,频谱共享干扰会导致认知系统中断饱和现象的发生,而在特定的主用户信噪比条件下,认知系统仍可获得完全的分集增益。

关键词: 认知中继系统, 频谱共享, 中断概率, 分集增益

Abstract:

The mutua1 spectrum-sharing interference in cognitive relay systems was considered. On the one hand,the interference from the secondary users(SU)to the primary user(PU)was 1imited in order to guarantee the QoS of primary transmissions;and on the other hand,Rayleigh-faded interference from the PU to the SU was modeled. Based on these considerations,the closed-form expression of the outage probability of cognitive relay systems was derived. Theoretica1 solutions and simulation results show that spectrum-sharing interference 1eads to the outage saturation of cognitive relay systems as the SNR of the PU increases and the fu11 diversity gain is able to be achieved with a certain SNR of the PU.

Key words: cognitive relay system, spectrum sharing, outage probability, diversity gain

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