A Cooperative Sensing Based Cognitive Relay Transmission Scheme Without a Dedicated Sensing Relay Channel in Cognitive Radio Networks

被引：43
作者：
Zou, Yulong [1 ,2 ]
Yao, Yu-Dong [2 ]
Zheng, Baoyu [1 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Inst Signal Proc & Transmiss, Nanjing 210003, Jiangsu, Peoples R China
[2] Stevens Inst Technol, Dept Elect & Comp Engn, Hoboken, NJ 07030 USA
来源：
IEEE TRANSACTIONS ON SIGNAL PROCESSING | 2011年 / 59卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Cognitive radio; cognitive relay; cognitive transmission; cooperative sensing; outage probability; OPPORTUNISTIC COOPERATION; OUTAGE ANALYSIS; DIVERSITY; SELECTION;
D O I：
10.1109/TSP.2010.2090876
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this correspondence, we investigate a selective relay spectrum sensing and best relay data transmission (SRSS-BRDT) scheme for multiple-relay cognitive radio networks. Specifically, in the spectrum sensing phase, only selected cognitive relays are utilized to transmit/forward their initial detection results (without a dedicated sensing relay channel) to a cognitive source for fusion, where the dedicated sensing channel refers to the channel transmitting initial spectrum sensing results from cognitive relays to the cognitive source. In the data transmission phase, only the best relay is selected to assist the cognitive source for its data transmissions. By jointly considering the two phases, we derive a closed-form expression of the outage probability for the SRSS-BRDT scheme over Rayleigh fading channels. We show that the SRSS-BRDT scheme outperforms the traditional cognitive transmission scheme (with a limited dedicated sensing channel) in terms of the outage probability performance. In addition, numerical results illustrate that the outage probability of the SRSS-BRDT scheme can be minimized through an optimal allocation of the time durations between the spectrum sensing and data transmission phases.
引用
收藏
页码：854 / 858
页数：5
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