认知合作中继网络中的最优中继选择策略  

Optimal Relay Selection Strategy in Cognitive Cooperative Relaying Network

作　　者：刘银山[1,2,3] 钟晓峰[1,2] 王京[1,2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]清华信息科学与技术国家实验室,北京100084 [3]空军大连通信士官学校,大连116600

出　　处：《电信科学》2015年第11期26-31,共6页Telecommunications Science

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(No.2012CB316000);国家科技重大专项基金资助项目(No.2015ZX03002010-002)~~

摘　　要：认知合作中继通信可以有效提升无线通信网络的性能和频谱效率。在中继节点较多的情况下,最优中继选择是一个有待解决的问题,它是中继探测成本与合作通信的分集增益之间的一个折中。基于有限情形的最优停时理论给出了最优中继选择策略,进一步得到一个纯SNR(signal-to-noise ratio,信噪比)阈值结构的策略。数字仿真结果验证了其有效性,在待探测中继较多和每个中继探测成本较高情况下,该最优中继选择策略以最少的探测次数获得最大的收益增益。Cognitive cooperative relaying communication significantly improves the performance of wireless communication networks and spectral efficiency. Optimal relay selection problem, which characterize the desired tradeoff between the probing cost for estabJishing cooperative transmission and hence higher reward via cooperative diversity, is a hard issue when the number of relay nodes is large. Optimal relay selection strategy was established by using optimal stopping theory with a finite horizon. Furthermore, a pure SNR （signal-to-noise ratio） threshold structure was exhibited. Theoretical analysis and numerical results indicate that proposed optimal relay selection strategy is effective in reducing the number of probing candidate relays and improving the reward of source.

关 键 词：中继选择 最优停时理论 合作通信 认知无线电 

分 类 号：TN92[电子电信—通信与信息系统]