Outage Probability and Optimum Power Allocation for Analog Network Coding
Outage Probability and Optimum Power Allocation for Analog Network Coding
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DOI：
10.1109/twc.2011.120810.100873
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发表时间：
2011-02
影响因子：
10.4
通讯作者：
Z. Yi;M. Ju;Il Kim
中科院分区：
文献类型：
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作者：
Z. Yi;M. Ju;Il Kim
我们研究模拟网络编码（ANC），它是一种著名的基于放大转发（AF）的双向协议，适用于由两个不同信源和一个中继组成的双向网络。在该协议中，两个信源在半双工模式下的两个时隙内借助中继交换信息。对于这个系统，我们首先推导出中断概率的一个紧下界，它在整个信噪比（SNR）范围内都非常接近精确的中断概率，而与信道方差的值无关。利用这个紧下界，我们得到了ANC协议的有限信噪比分集 - 复用折衷。此外，我们提出了一种最优功率分配方案，它能同时最小化中断概率并最大化ANC协议的总互信息。
We study the analog network coding (ANC), which is a well-known amplify-and-forward (AF)-based bidirectional protocol, for a bidirectional network consisting of two different sources and a relay. In this protocol, the two sources exchange information with the help of the relay during two time slots in a half-duplex mode. For this system, we first derive a tight lower bound of outage probability, which is very close to the exact outage probability in the whole signal-to-noise ratio (SNR) range irrespective of the values of channel variances. Using the tight lower bound, we obtain finite-SNR diversity-multiplexing tradeoff of the ANC protocol. Furthermore, we propose an optimum power allocation scheme, which simultaneously minimizes the outage probability and maximizes the total mutual information of the ANC protocol.