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工程科学与技术:2011,43(6):168-172
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噪声不确定下认知无线电能量检测性能的分析
(哈尔滨工业大学 通信技术研究所)
Performance Analysis of Energy Detection for Cognitive Radio Under Noise Uncertainty
(Communication Research Center,Harbin Institute of Technol.)
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投稿时间:2010-12-03    修订日期:2011-06-20
中文摘要: 针对实际通信中背景噪声的强度是不确定的,研究了噪声不确定性对认知无线电能量检测的稳定性和持续性产生的影响,分析了能量检测在噪声墙下的稳定性,得出稳定概率和最小采样点数;提出检测中断概率反映噪声不确定下能量检测的持续性,并分别得出单用户检测和协作检测的中断概率,以及能量检测所需的检测时间;分析了能量检测的检测概率,得出噪声不确定下检测概率的分布函数,并通过分布函数得到一定中断概率下的最大目标检测概率。仿真表明:增加采样点数能够提高能量检测的稳定性;噪声不确定度提高或者标称信噪比降低会增加能量检测的中断概率,而采用多认知用户协作检测可以降低中断概率。
中文关键词: 认知系统  信号检测  采样  电磁干扰
Abstract:The influence of noise uncertainty to Energy Detection(ED) of Cognitive Radio(CR) was investigated. The stability of ED was analyzed in order to obtain the stability probability and minimal sampling number. The interruptive detection probability was proposed to reflect the continuance of ED under noise uncertainty. Both the interruptive detection probabilities of single detection and cooperative detection were obtained, and the detection time of ED was also achieved. The detection probability was analyzed in order to achieve its Distribution Function(DFC), and the maximal objective detection probability under the specific interruptive detection probability was estimated through DFC.Simulations showed that the stability of ED could be improved with the increase of sampling number, while the interruptive detection probability increass with the improvment of noise uncertainty or the degrading of the normal Signal-to-Noise Rate(SNR). It also denoted that through cooperative detection, the interruptive detection probability could be degraded.
文章编号:201001180     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(61071104)
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引用文本:
刘鑫,谭学治,徐贵森.噪声不确定下认知无线电能量检测性能的分析[J].工程科学与技术,2011,43(6):168-172.
Liu Xin,Tan Xuezhi,Xu Guiseng.Performance Analysis of Energy Detection for Cognitive Radio Under Noise Uncertainty[J].Advanced Engineering Sciences,2011,43(6):168-172.