认知无线电多时隙联合频谱感知方法及优化

doi:10.3969/j.issn.0372-2112.2015.05.009

电子学报 ›› 2015, Vol. 43 ›› Issue (5): 895-900.DOI: 10.3969/j.issn.0372-2112.2015.05.009

认知无线电多时隙联合频谱感知方法及优化

刘鑫, 仲伟志, 井庆丰

南京航空航天大学航天学院, 江苏南京 210016

收稿日期:2014-01-17 修回日期:2014-06-30 出版日期:2015-05-25
- 作者简介:
- 刘鑫男,1984年出生于黑龙江哈尔滨市,2012年于哈尔滨工业大学电子与信息工程学院获得工学博士学位,现为南京航空航天大学航天学院讲师,主要研究方向为认知无线电,空间光通信.E-mail:liuxinstar1984@nuaa.edu.cn;仲伟志 女,1980年出生于吉林省长春市,2010年于哈尔滨工业大学电子与信息工程学院获得工学博士学位,现为南京航空航天大学航天学院讲师,主要研究方向为卫星移动通信,宽带无线通信.E-mail:zhongwz@nuaa.edu.cn
- 基金资助:
- 国家自然科学基金 (No.61102069,No.61301105); 江苏省自然科学基金 (No.BK20140828)

Multi-Slot Cooperative Spectrum Sensing Method with Optimization in Cognitive Radio

LIU Xin, ZHONG Wei-zhi, JING Qing-feng

College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China

Received:2014-01-17 Revised:2014-06-30 Online:2015-05-25 Published:2015-05-25

摘要/Abstract

摘要：

为了降低认知无线电中次用户对主用户的干扰,提出了次用户通过多个时隙的能量感知联合检测主用户的频谱感知方法.每个传输帧被分成若干个时隙,次用户在每个时隙的开始进行能量感知,通过合并多个时隙的感知结果,提高次用户对主用户的检测性能.为了最大化次用户的频谱效率,将主用户状态建模为二维马尔科夫随机过程,并根据该过程优化单时隙频谱感知时间.仿真结果表明:相比Liang的“先听后传”频谱感知方法,提出方法仅牺牲14%的频谱效率,却使干扰概率降低了28%;随着信噪比增加,提出方法的最大频谱效率逐渐接近“先听后传”频谱感知方法.

关键词: 认知无线电, 联合频谱感知, 频谱效率, 干扰概率

Abstract:

In order to decrease the interference to the primary user (PU) caused by the secondary user (SU) in cognitive radio,a spectrum sensing method is proposed to cooperatively detect the PU through multi-slot energy sensing of the SU.Each transmission frame was divided into several time slots,and the SU sensed the PU at the beginning of each time slot.The SU could improve the performance of detecting PU through combining the multi-slot sensing results.In order to maximize the SU's spectrum efficiency,the PU state was built as a two-dimensional Markov random process,and according to this process,the single-slot sensing time was optimized.The simulation results show that compared to the "listen-before-transmit" spectrum sensing method proposed by Liang,the proposed method reduces the interference probability of 28% by only sacrificing the spectrum efficiency of 14%,and with the increase of the signal-to-noise ratio (SNR),the maximal spectrum efficiency of the proposed method gradually approaches that of the "listen-before-transmit" spectrum sensing method.

Key words: cognitive radio, cooperative spectrum sensing, spectrum efficiency, interference probability

中图分类号:

TN92

刘鑫, 仲伟志, 井庆丰. 认知无线电多时隙联合频谱感知方法及优化[J]. 电子学报, 2015, 43(5): 895-900.

LIU Xin, ZHONG Wei-zhi, JING Qing-feng. Multi-Slot Cooperative Spectrum Sensing Method with Optimization in Cognitive Radio[J]. Acta Electronica Sinica, 2015, 43(5): 895-900.

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认知无线电多时隙联合频谱感知方法及优化

Multi-Slot Cooperative Spectrum Sensing Method with Optimization in Cognitive Radio

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