认知无线电中基于POMDP的机会频谱接入方案  

Scheme of opportunistic spectrum access based on POMDP in cognitive radio networks

作　　者：李晓娅[1] 张有光[1] 吴华森[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《计算机工程与设计》2011年第4期1182-1185,共4页Computer Engineering and Design

基　　金：国家973重点基础研究发展计划基金项目(2010CB731803)

摘　　要：为了充分利用先验信息,更好地对空闲频谱进行接入,针对认知无线电的多信道接入问题提出了一种基于半可观马尔可夫决策过程的认知无线电频谱接入方案。该方案采用信任向量,结合当前感知结果对主用户行为进行预测,并利用半可观马尔可夫决策理论选择出当前空闲概率最大的信道进行接入。同时根据信道前后相关性对次用户的发送时间、休眠时间进行了优化。仿真结果表明,该方案能够改善频谱接入方案,提高频谱利用率。To take full advantage of prior information and use the free frequency adequately,a scheme of opportunistic spectrum access based on POMDP is proposed aimed at the problem of accessing with multichannel environment in cognitive radio networks.Firstly,the scheme use POMDP theory to choose the channel with the biggest free probability to access according to the result of sensing.Further-more,the send-time and sleep-time are also optimized according to the correlation of channel.Simulation results show that the probability of channel utilization is enhanced and the scheme can further optimize the frequency distribution.

关 键 词：认知无线电 信任向量 半可观马尔科夫决策 发送时间优化 休眠时间优化 

分 类 号：TN929.5[电子电信—通信与信息系统]