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认知无线电线性自信号消除带内频谱感知方法
刘超,孙雁飞
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(南京邮电大学信息网络技术研究所，南京 210003;江苏大学电气信息工程学院，江苏镇江 212013)

摘要:

利用无线衰落信道AR模型，提出了一种不需要静默期的基于线性自信号消除的认知无线电主用户信号检测方法。该方法无需为避免静默期而频繁地中断通信，提高了通信效率和服务质量。仿真结果表明，该算法在多普勒频移较大时优于已有的无静默期带内频谱感知方法，在满足IEEE 802.22无线区域网主用户信号检测需求的同时，增强了系统频谱感知的性能。

关键词: 认知无线电带内感知静默期自信号消除

DOI：

基金项目:国家自然科学基金青年科学基金资助项目（61003237）；江苏省高校自然科学研究项目（10KJB510018)

In band Spectrum Sensing for Cognitive Radio by Linear Self signal Elimination

LIU Chao,SUN Yan-fei

(Institute of Information Network Technology,Nanjing University of Posts an d Telecommunications,Nanjing 212003,China; School of Electrical and Information Engineering,Jiangsu University, Zhenjia ng 212013,China)

Abstract:

An inband spectrum sensing method is p roposed based on linear selfsignal elimi nation for cognitive radio(CR) by using the AR model of wireless fading channel. With this method,it is unnecessary to interrupt the communication to avoid the u sage of quiet period and guarantee the performance of the network. The simulatio n results show that the proposed method is better than the existing inband spe ctrum sen sing methods without quiet period when the Doppler frequency shift is large. The algorithm achieves an acceptable detection performance for IEEE802.22 system an d improves the performance of spectrum sensing.

Key words: cognitive radio in band spectrum sensing quiet period linear self signal el imination