Performance analysis of full-duplex based two-way relaying
Performance analysis of full-duplex based two-way relaying
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DOI：
10.1109/cc.2016.7781716
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发表时间：
2016-12
影响因子：
4.1
通讯作者：
Xiaohui Sun;Dandan Zhang;Xiaoming Dai
中科院分区：
文献类型：
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作者：
Xiaohui Sun;Dandan Zhang;Xiaoming Dai
协作通信被认为是在提高无线通信链路可靠性的同时提高无线覆盖范围的一种很有前途的技术。与传统的半双工(HD)模式中继技术不同，基于全双工的双向中继(FD-TWR)使得两个节点之间的数据交换可以在单个时隙内完成，从而显著提高了频谱效率。本文首先给出了FD-TWR的信道模型，然后推导了关键性能指标，包括接收信干噪比(SINR)、遍历容量的上界以及放大转发(AF)模式下FD-TWR的闭合解。此外，考虑发射功率总和的限制，通过推导源节点和中继节点的最优发射功率，将FD-TWR最优功率分配的目标函数表示为一个极值问题。只要FD-TWR节点中的自干扰(SI)信号能够被充分抑制，所提出的方案在遍历容量和中断概率方面都优于传统的HD模式。此外，无论实际的SI功率如何，所提出的FD-TWR总是能够在所提出的最优功率分配方案的帮助下获得最佳性能。
Cooperative communication is regarded as a promising technique for improving the reliability of wireless communication links and enhancing the radio coverage simultaneously. Unlike the conventional half-duplex (HD) mode relaying techniques, the full-duplex based two-way relaying (FD-TWR) enables data exchanges between two nodes to be completed within a single time-slot, thus resulting in a significant improvement in the spectrum efficiency. In this paper, the channel model of the FD-TWR is first given out, followed by deriving the critical performance metrics, including the received signal-to-interference-plus-noise ratio (SINR), the upper bound of the ergodic capacity and the closed-form solution of the proposed FD-TWR under amplify-and-forward (AF) mode. Furthermore, taking the limit of sum-transmit-power into account, we formulate the objective function of the optimal power allocation of FD-TWR as an extreme-value problem by deriving the optimal transmit power for both the source nodes and the relay node. As long as the self-interference (SI) signal in the FD-TWR nodes can be sufficiently suppressed, the proposed scheme is shown to outperform the conventional HD mode in terms of both the ergodic capacity and the outage probability. In addition, regardless of the practical SI power, the proposed FD-TWR is always capable of achieving its best performance with an aid of the proposed optimal power allocation scheme.