计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

非理想频谱感知下认知无线电系统性能分析

陈松,王盛,郑娜娥,胡捍英   

  1. (解放军信息工程大学导航与空天目标工程学院,郑州 450001)
  • 收稿日期:2015-04-09 出版日期:2016-04-15 发布日期:2016-04-15
  • 作者简介:陈松(1986-),男,博士研究生,主研方向为认知无线电、信号检测;王盛,博士研究生;郑娜娥,博士;胡捍英,教授、博士、博士生导师。
  • 基金项目:
    国家“863”计划基金资助项目“卫星移动通信系统全物理测试验证设备研究”(2012AA01A505)。

Performance Analysis of Cognitive Radio System Under Non-ideal Spectrum Sensing

CHEN Song,WANG Sheng,ZHENG Nae,HU Hanying   

  1. (School of Navigation and Aerospace Object Engineering,PLA Information Engineering University,Zhengzhou 450001,China)
  • Received:2015-04-09 Online:2016-04-15 Published:2016-04-15

摘要: 采用连续时间马尔可夫链对多信道非理想感知条件下的认知无线电系统进行建模,构建不同状态间的跳转率、系统检测率以及用户到达率之间的关系方程,并给出系统状态平稳分布的通用求解方法。数值仿真结果表明,在该系统模型下,冲突率、信道利用率与次用户到达强度呈正比例关系,与信道数、误检率呈反比例关系。在实际认知无线电系统设计过程中可参考上述结论,依据需求折中设定相关参数以获得目标性能。

关键词: 认知无线电, 频谱感知, 连续时间马尔可夫链, 传输冲突, 信道利用率

Abstract: The Continuous Time Markov Chain(CTMC) is adopted to construct the cognitive radio system under multi-channel non-ideal spectrum sensing.Based on this,the relationship of the state transition rate,system detection rate and user arrival rate is formulated.The universal solution method of stationary distribution of the system states is given.Numerical simulation result indicates that the conflict probability and the channel utilization are proportional to the strength of second user arrival rate,and opposite to the number of channels and the false detection rate.In the realistic design,parameters can be set according to the conclusion in this paper as desired.

Key words: cognitive radio, spectrum sensing, Continuous Time Markov Chain(CTMC), transmission collision, channel utilization

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