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首页> 外文期刊>Vehicular Technology, IEEE Transactions on >On the Study of Half-Duplex Asymmetric Two-Way Relay Transmission Using an Amplify-and-Forward Relay
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On the Study of Half-Duplex Asymmetric Two-Way Relay Transmission Using an Amplify-and-Forward Relay

机译：使用放大转发中继的半双工不对称双向中继传输的研究

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摘要

This paper studies the information-theoretic metric of outage probability for a half-duplex asymmetric two-way amplify-and-forward (AF) relaying. Unlike current research activities, our main purpose is to examine the impact of traffic asymmetry on system outage probability. First, an exact but two-integral-form outage probability is derived over Rayleigh fading channels. To provide more insight, a closed-form asymptotic outage probability is then obtained. It is shown that the outage probability in the system is determined only by the one-way channel or related to the two-way links, depending on the asymmetric level of the two senders' target rates and the terminals' average transmission powers. Following this analysis, optimum power allocation and opportunistic relay selection are studied to optimize the overall performance of the considered AF scenario. Next, with the aid of traffic knowledge, novel power allocation and relay selection criteria are proposed, followed by an analysis of the outage probability with the relay selection. Simulation experiments are performed to validate the proposed studies in this paper. The results show that the proposed power allocation and relay selection methods can achieve significant performance gains in terms of outage probability, regardless of symmetric or asymmetric traffic and channels.
机译：本文研究了半双工非对称双向放大转发（AF）中继的中断概率的信息理论度量。与当前的研究活动不同，我们的主要目的是检查流量不对称对系统中断概率的影响。首先，在瑞利衰落信道上得出了精确但为两个整数形式的中断概率。为了提供更多的见解，然后获得一种封闭形式的渐进中断概率。结果表明，系统中的断电概率仅由单向信道确定或与双向链路有关，这取决于两个发送方目标速率的不对称水平和终端的平均传输功率。经过此分析，研究了最佳功率分配和机会继电器选择，以优化考虑的AF场景的整体性能。接下来，借助交通知识，提出了新的功率分配和中继选择准则，然后通过中继选择分析了停电概率。进行仿真实验以验证本文提出的研究。结果表明，所提出的功率分配和中继选择方法可以在中断概率方面实现显着的性能提升，而与对称或​​不对称的流量和信道无关。

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