双队列缓存结构认知无线网络模型研究  

RESEARCH ON COGNITIVE RADIO NETWORK WITH DUAL QUEUE CACHE STRUCTURE MODEL

作　　者：肖除病[1] 程晖[1] 朱星宇[1] 

机构地区：[1]武汉大学物理科学与技术学院湖北武汉430072

出　　处：《计算机应用与软件》2013年第6期52-56,共5页Computer Applications and Software

基　　金：国家重点基础研究发展计划项目(2009CB320400)

摘　　要：提出一种双队列缓存结构认知无线网络模型。在基于频谱切换的基础上运用马尔科夫过程模型对双队列缓存结构对认知无线网络性能的影响进行研究,推导次用户的被迫中断概率以及系统阻塞率的表达式,最后探讨该策略与单队列缓存结构策略的性能比较并通过仿真来验证。结果表明,双队列缓存结构可以更有效降低次用户的被迫中断传输概率以及系统阻塞概率,对于提高系统的吞吐量以及系统传输性能的提升都是很有帮助的。This paper presents a cognitive radio network model with dual queue cache structure. Markov process model is used based on the spectrum handoff to study the impact of dual queue cache on the performance of cognitive radio network, the expressions of forced termination probability of the secondary users and the system blocking probability are derived. Finally, the performance comparison between the strategies with single queue cache structure and dual queue cache structure respectively is discussed, and is verified with simulation. Results show that the dual queue cache structure can be more effective in reducing the forced transmission probability of the secondary users as well as the blocking probability, which are helpful in improving the system throughput and transmission performance.

关 键 词：认知无线网络 机会频谱接入 频谱切换 马尔科夫链 队列缓存 被迫中断概率 阻塞率 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]