J4 ›› 2012, Vol. 39 ›› Issue (1): 115-121.doi: 10.3969/j.issn.1001-2400.2012.01.021

• 研究论文 • 上一篇    下一篇

删余协作频谱感知性能分析及优化

李美玲1,2;袁超伟1;田心记1;李琳1
  

  1. (1. 北京邮电大学 信息与通信工程学院,北京  100876;
    2. 太原科技大学 电子信息工程学院,山西 太原  030024)
  • 收稿日期:2010-09-28 出版日期:2012-02-20 发布日期:2012-04-06
  • 通讯作者: 李美玲
  • 作者简介:李美玲(1982-),女,讲师,北京邮电大学博士研究生,E-mail: meiling_li@126.com.
  • 基金资助:

    国家自然科学基金资助项目(60872149,60672132)

Performance analysis and optimization of censoring  based cooperative spectrum sensing

LI Meiling1,2;YUAN Chaowei1;TIAN Xinji1;LI Lin1   

  1. (1. School of Info. and Commun. Eng., Beijing Univ. of Posts and Telecomm., Beijing  100876, China;
    2. School of Electronics and Info. Eng., Taiyuan Univ. of Sci. and Tech., Taiyuan  030024, China)
  • Received:2010-09-28 Online:2012-02-20 Published:2012-04-06
  • Contact: LI Meiling

摘要:

提出了一种新的基于删余的协作频谱感知方法,通过减少实际发送的本地决策值数来节约控制信道带宽,降低检测性能对认知用户数的依赖; 分析了这种删余协作频谱感知在感知信道和报告信道均存在衰落下的性能,它可以有效解决报告信道衰落所带来的尾感知问题,降低了虚警率; 提出了进一步优化算法,算法在确保主用户受到足够保护的前提下,通过寻找最优的次用户数和相应的检测门限使次用户的接入机会最大化.仿真结果与理论分析相一致.

关键词: 协作频谱感知, 控制信道带宽, 衰落信道, 虚警率, 检测门限

Abstract:

In cognitive radio networks, the control channel bandwidth is limited while implementing the cooperative spectrum sensing. Besides, the severe tail sensing problem exists due to the imperfect reporting channels. A censoring based cooperative spectrum sensing scheme is analyzed in this paper, which reduces the control bandwidth by decreasing the average number of sensing bits reported to the fusion center and also the dependence of the detection performance on the cognitive user number. The sensing performance of the proposed scheme is analyzed under both imperfect sensing channels and reporting channels, which indicates that the tail sensing problem could be effectively solved and that the false alarm probability could also be decreased. An optimal cooperative spectrum sensing algorithm is further proposed for maximizing the spectrum access chance of the secondary user by looking for the optimal party of the number of cognitive users and the detection threshold under a certain protective level to the primary user. Simulation results validate the theoretical analysis.

Key words: cooperative spectrum sensing, control bandwidth, fading channel, the false alarm probability, detection threshold

中图分类号: 

  • TN92