Communicating Over Filter-and-Forward Relay Networks With Channel Output Feedback
Communicating Over Filter-and-Forward Relay Networks With Channel Output Feedback
复制标题
通过具有通道输出反馈的过滤转发中继网络进行通信
DOI：
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复制
发表时间：
2013
影响因子：
5.4
通讯作者：
V. Balakrishnan
中科院分区：
文献类型：
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作者：
Mayur Agrawal;D. Love;V. Balakrishnan
中继网络有助于提高从源端到目的端的通信速率。然而，即使是三端中继信道的容量也是一个悬而未决的问题。在本文中，我们提出了在有记忆噪声存在的情况下，具有目的地到源反馈的三端中继信道容量的一个新的下界。我们的下界改进了文献中现有的下界。然后，我们使用任意数量的过滤转发中继节点将我们的下界扩展到一般的中继网络配置。这种网络配置在许多多跳通信系统中很常见，其中由于计算能力有限，中间节点只能执行最低限度的处理。仿真结果表明，该方法可以显著提高系统的可达速率。接下来，我们推导了一种编码策略(以处理后的信噪比为准则进行优化)，用于两次传输具有噪声信道输出反馈的三端中继信道。该编码方案可以与开环码一起用于诸如自动重传请求(ARQ)或混合ARQ之类的应用。
Relay networks aid in increasing the rate of communication from source to destination. However, the capacity of even a three-terminal relay channel is an open problem. In this paper, we propose a new lower bound for the capacity of the three-terminal relay channel with destination-to-source feedback in the presence of noise with memory. Our lower bound improves on the existing bounds in the literature. We then extend our lower bound to general relay network configurations using an arbitrary number of filter-and-forward relay nodes. Such network configurations are common in many multihop communication systems where the intermediate nodes can only perform minimal processing due to limited computational power. Simulation results show that significant improvements in the achievable rate can be obtained through our approach. We next derive a coding strategy (optimized using post processed signal-to-noise ratio as a criterion) for the three-terminal relay channel with noisy channel output feedback for two transmissions. This coding scheme can be used in conjunction with open-loop codes for applications like automatic repeat request (ARQ) or hybrid-ARQ.