北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2013, Vol. 36 ›› Issue (2): 89-92.doi: 10.13190/jbupt.201302.89.liyx

• 研究报告 • 上一篇    下一篇

认知无线电中改进的低复杂度联合检测方法

李映雪1, 沈树群1, 袁超伟2, 王秋才2   

  1. 1. 北京邮电大学 电子工程学院, 北京 100876; 2. 北京邮电大学 信息与通信工程学院, 北京 100876
  • 收稿日期:2012-07-06 修回日期:2012-09-10 出版日期:2013-04-30 发布日期:2013-03-25
  • 通讯作者: 李映雪 E-mail:liyingxueli@gmail.com
  • 作者简介:李映雪(1982-),男,博士生,Email:liyingxueli@gmail.com; 沈树群(1945-),男,教授,博士生导师
  • 基金资助:

    国家自然科学基金项目(60872149)

A Joint Spectral Detection Algorithm with Low Complexity in Cognitive Radio

LI Ying-xue1, SHEN Shu-qun1, YUAN Chao-wei2, WANG Qiu-cai2   

  1. 1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;<br>2. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2012-07-06 Revised:2012-09-10 Online:2013-04-30 Published:2013-03-25

摘要:

认知无线电频谱检测中能量检测算法在低信噪比下检测效率低,而似然比检测(LRT)算法复杂度过高. 对此,首先在低信噪比下对LRT算法进行了化简,并给出了化简LRT算法性能参数的闭合表达式;提出了一种联合检测算法,在低信噪比条件下采用能量与简化LRT二次检测,在其他条件下则采用能量检测. 理论分析和仿真结果均表明,所提算法在低信噪比下能对主用户信号有效检测,且实现复杂度低,检测性能优于LRT算法.

关键词: 认知无线电, 似然比检测, 联合频谱检测, 能量检测

Abstract:

For the problem of energy detections inability of weak signals and the likelihood ratio test (LRT)s high computational complexity in cognitive radio, the LRT algorithm is simplified under low signal-to-noise ratio (SNR) and its performance parameters are calculated. A spectrum joint detection algorithm is presented based on the simplified LRT, in which the energy detector and the simplified LRT under low SNR are used. Simulation shows that the algorithm detects the primary user signal effectively under low SNR condition, and performs close performance with lower complexity than that of the well-known LRT.

Key words: cognitive radio, likelihood ratio test, joint spectral detection, energy detection

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