认知无线电系统容量性能分析  

Capacity analysis in cognitive radio system

作　　者：陈松[1] 王盛[1] 胡捍英[1] 

机构地区：[1]解放军信息工程大学导航与空天目标工程学院,河南郑州450001

出　　处：《电子技术应用》2015年第6期95-98,共4页Application of Electronic Technique

基　　金：国家高技术研究发展计划(863计划)(2012AA01A505)

摘　　要：采用连续时间马尔可夫链对主用户系统和认知系统的认知-传输过程进行建模。在此模型基础上,分析构建了次用户到达率、检测概率与频谱利用率之间的关系方程,依据系统状态平稳分布与频谱占用时间的等效性,进一步推出了认知系统容量的闭式解。仿真结果表明,随着漏检概率的增加,频谱利用率呈现先快速升高后缓慢下降的趋势。认知系统容量随着次用户到达率的提高而增加,但是增加幅度逐渐变小。The cognitive-transmission procedure of primary user system and cognitive radio system is modeled by using contin- uous time Markov chain, and formulations that express the relationship among the arrival rate of the secondary users, detection pos- sibility and spectrum usage are established. Furthermore, the close form resolution of the cognitive system capacity is deduced by the equalization of the system stable distribution and the time of spectrum occupation. Simulation results show that the spectrum us- age firstly increase sharply and then decrease slowly as the false dismissal possibility increases. The capacity of the cognitive radio system increases as the arrival rate of the secondary user increases, but the increase slows down.

关 键 词：认知无线电 频谱感知 连续时间马尔可夫链 系统容量 

分 类 号：TN915.02[电子电信—通信与信息系统]