北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2011, Vol. 34 ›› Issue (3): 44-47.doi: 10.13190/jbupt.201103.44.tangjm

• 论文 • 上一篇    下一篇

基于中继选择的认知系统性能

唐菁敏1,2,罗涛1,2,乐光新1   

  1. 1.北京邮电大学 信息与通信工程学院, 北京 100876;  2.西安电子科技大学 综合业务网理论及关键技术国家重点实验室, 西安 710071
  • 收稿日期:2010-09-13 修回日期:2010-11-12 出版日期:2011-06-28 发布日期:2011-03-29
  • 通讯作者: 罗涛 E-mail:tluo@bupt.edu.cn
  • 基金资助:

    国家自然科学基金项目(60872049,60871042,60971082,60972073); 国家重点基础研究发展计划项目(2009CB320407); 国家重大科技专项项目(2009ZX03003001,2009ZX03003011,2010ZX03001003); ISN国家重点实验室开放基金项目(ISN1203)

Performance of Cognitive System Based on Relay Selection

  • Received:2010-09-13 Revised:2010-11-12 Online:2011-06-28 Published:2011-03-29

摘要:

为了提高认知系统的性能,提出一种混合中继选择协议(HPRS). 通过判断中继是否能正确解码源信号来决定中继采用何种协议转发数据,最终选取其中信噪比最大的中继作为最优中继,并推导了HPRS在高信噪比下中断概率的近似表达式及分集度. 理论和仿真结果表明,放大转发中继选择(SAF)、解码转发中继选择(SDF)协议和HPRS均可获得空间满分集度,而HPRS的中断性能要优于SAF和SDF协议.

关键词: 认知无线电, 中继选择, 功率受限, 中断概率, 合作分集

Abstract:

A hybrid protocol with relay selection(HPRS) is derived to improve the cognitive performance. What a cooperative protocol is chosed is rest with the the source signal relay decoding. The relay with the highest relaydestination signaltonoise ratio is selected to forward the data. The approximated outage probability formulation and diversity for HPRS is given. Simulation shows that amplifyandforward with relay selection(SAF), decodeandforward with relay selection(SDF) protocol and HPRS can achieve full space diversities, but the HPRS is better than that of both SAF and SDF in outage performance.

Key words: cognitive radio, relay selection, power constrained, outage probability, cooperative diversity

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