基于收益的认知无线电多信道阶梯排队接入机制分析  

Reward Based Multichannel Step-queuing Access Scheme in Cognitive Radio

作　　者：王玲[1] 彭启琮[1] 彭启航[1] 

机构地区：[1]电子科技大学通信与信息工程学院,成都611731

出　　处：《电子与信息学报》2012年第8期1944-1949,共6页Journal of Electronics & Information Technology

基　　金：中央高校基本科研业务费专项资金(ZYGX2010J003)资助课题

摘　　要：为了简化分析认知无线电系统中授权用户享有更高优先级对认知用户造成的影响,该文将2维生灭排队过程等效为1维非占先排队模型进行分析;并在多信道情景下,提出了一种基于信道收益的阶梯式排队接入方案,给出了由队列结构系数决定的系统性能参数阻塞概率及强制中断率的解析结果。仿真与数值计算验证了等效1维非占先排队模型的有效性;同时比较几种排队机制的性能参数,该文接入方案有较低的阻塞率,并且可根据系统环境自适应调整队列结构将强制中断率控制在较低范围内,不会随系统负荷率增高而增高。This paper investigates continued-time two-dimensional birth-and-death process with priority in cognitive radio system. To simplify analysis, one-dimensional queuing model without priority is derived to equalize the complicated process. And a step-queuing scheme based on channel reward in multichannel scene is proposed, whose block probability and force termination probability performance determined by the Queuing-Structure Coefficient （QSC）. Analytical results and simulation confirm the equivalent queuing model without priority valid. Also some diverse access scheme are compared in performance, step-queuing scheme presents a lower block probability and an adaptive force termination probability.

关 键 词：认知无线电 排队论 动态频谱接入 生灭过程 优先级 

分 类 号：TN92[电子电信—通信与信息系统]