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首页> 外文期刊>Signal Processing, IEEE Transactions on >A Cooperative Sensing Based Cognitive Relay Transmission Scheme Without a Dedicated Sensing Relay Channel in Cognitive Radio Networks
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A Cooperative Sensing Based Cognitive Relay Transmission Scheme Without a Dedicated Sensing Relay Channel in Cognitive Radio Networks

机译：认知无线电网络中基于协作感知的无专用感知中继信道的认知中继传输方案

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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.
机译：在这种对应关系中，我们研究了针对多中继认知无线电网络的选择性中继频谱感测和最佳中继数据传输（SRSS-BRDT）方案。具体而言，在频谱感知阶段，仅利用选定的认知中继将其初始检测结果（无专用侦听中继信道）发送/转发给认知源进行融合，其中专用侦听信道是指传输初始频谱侦听的信道从认知中继到认知来源的结果。在数据传输阶段，仅选择最佳中继来辅助认知源进行数据传输。通过共同考虑这两个阶段，我们得出了瑞利衰落信道上SRSS-BRDT方案的中断概率的闭式表达式。我们显示，就中断概率性能而言，SRSS-BRDT方案优于传统的认知传输方案（具有有限的专用感测通道）。另外，数值结果表明，可以通过在频谱感测和数据传输阶段之间的持续时间的最佳分配来将SRSS-BRDT方案的中断概率最小化。

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