J4 ›› 2014, Vol. 41 ›› Issue (3): 88-94.doi: 10.3969/j.issn.1001-2400.2014.03.013

• 研究论文 • 上一篇    下一篇

低信噪比下基于双检测长度的频谱感知算法

高锐;李赞;齐佩汉;关磊;刘进   

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安  710071)
  • 收稿日期:2013-06-07 出版日期:2014-06-20 发布日期:2014-07-10
  • 通讯作者: 高锐
  • 作者简介:高锐(1986-),男,西安电子科技大学博士研究生,E-mail:rgao_1@stu.xidian.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(61072070);教育部博士学科点基金资助项目(20110203110011);教育部基础科研业务费资助项目(72124338);陕西省自然基金重点资助项目(2012JZ8002);ISN国家重点实验室自主课题资助项目(ISN1101002);高等学校学科创新引智计划资助项目(B08038)

Spectrum sensing method based on the double sensing length under a low SNR

GAO Rui;LI Zan;QI Peihan;GUAN Lei;LIU Jin   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2013-06-07 Online:2014-06-20 Published:2014-07-10
  • Contact: GAO Rui

摘要:

针对现有认知网络中低信噪比条件下频谱感知性能差、速度慢的问题,提出了一种基于双检测长度的感知算法.该算法先进行一次短数据长度能量检测,当第1次判决主用户不存在时,再进行第2次长数据长度能量检测,并作出最终的感知判决.从理论上推导了平均样本数、检测性能、算法复杂度等重要性质.基于matlab的仿真结果验证了理论推导的正确性,表明所提算法在低信噪比条件下,在感知性能较传统能量检测算法有所提升的同时,具有更少的平均样本数和更低算法复杂度的特点,并有望应用于未来实际认知网络中.

关键词: 认知无线电, 频谱感知, 能量检测, 双检测长度

Abstract:

According to the spectrum sensing problem under a low signal-noise ratio (SNR) in cognitive radio networks, this paper proposes a spectrum sensing method based on the double sensing length. For the proposed algorithm, a short length energy detection will be carried out first. While it is making the decision there is no primary user, and the second long length energy detection will be taken to make the final decision. This paper analyzes some significant properties, such as the average sample number (ASN), detection performance and implementation complexity. Simulation results validate the theory, and show that in the low SNR regime the proposed algorithm can make the spectrum sensing more efficient than conventional energy detection. Meanwhile it possesses the advantages of a smaller ASN and lower complexity, and has potential applicability in cognitive radio sensor networks.

Key words: cognitive radio networks, spectrum sensing, energy detection, double sensing length