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首页> 外文期刊>IEEE communications letters >Cognitive Amplify-and-Forward Relay Networks with Switch-and-Examine Relaying in Rayleigh Fading Channels
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Cognitive Amplify-and-Forward Relay Networks with Switch-and-Examine Relaying in Rayleigh Fading Channels

机译：瑞利衰落信道中具有切换检查中继的认知放大转发中继网络

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摘要

This letter introduces cognitive channel-state-information (CSI)-assisted amplify-and-forward (AF) relay networks employing the low-complexity switch-and-examine diversity combining (SEC) relaying scheme. The scheme is based on the SEC diversity combining technique in which a relay out of multiple relays is selected to forward the source message to destination. The selection process is performed such that the end-to-end (e2e) signal-to-noise ratio (SNR) of the selected relay satisfies a predetermined switching threshold. In addition, the letter derives closed-form expressions for the outage probability and symbol error probability (SEP) of the proposed system. The system is also studied at high SNR values where approximate expressions for the outage probability, diversity order, and coding gain are derived. Results show that the diversity order of the studied cognitive AF relaying with SEC selection is the same as its non-cognitive counterpart.
机译：这封信介绍了采用低复杂度的交换和检查分集组合（SEC）中继方案的认知信道状态信息（CSI）辅助放大和转发（AF）中继网络。该方案基于SEC分集组合技术，其中从多个中继中选择一个中继以将源消息转发到目的地。执行选择过程，以使所选继电器的端对端（e2e）信噪比（SNR）满足预定的切换阈值。此外，该字母还为所建议系统的中断概率和符号错误概率（SEP）导出了封闭形式的表达式。还以高SNR值对系统进行了研究，其中得出了中断概率，分集阶数和编码增益的近似表达式。结果表明，所研究的具有SEC选择的认知AF中继的多样性顺序与其非认知对应物相同。

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