通过偷听反馈
Feedback through Overhearing
摘要：
在本文中，我们研究的反馈，来自无意中听到的价值，没有专门的反馈资源。为此，我们专注于一个简单的模型：一个确定性的两跳干扰信道，反馈来自偷听的前向链路。这种设置带来的一个新方面是中继信号的双重作用。虽然中继信号需要将源消息传送到其对应的目的地，但是它还可以提供反馈信号，这可以潜在地增加第一跳的容量。我们推导出的总和容量的内部和外部边界匹配的参数值的大范围内。我们的研究结果确定的参数范围内，偷听可以提供非负的容量增益，甚至可以实现专用反馈资源的性能。研究结果还提供了关于哪些传输对偷听最有用的见解。
英文摘要：
In this paper we examine the value of feedback that comes from overhearing, without dedicated feedback resources. We focus on a simple model for this purpose: a deterministic two-hop interference channel, where feedback comes from overhearing the forward-links. A new aspect brought by this setup is the dual-role of the relay signal. While the relay signal needs to convey the source message to its corresponding destination, it can also provide a feedback signal which can potentially increase the capacity of the first hop. We derive inner and outer bounds on the sum capacity which match for a large range of the parameter values. Our results identify the parameter ranges where overhearing can provide non-negative capacity gain and can even achieve the performance with dedicated-feedback resources. The results also provide insights into which transmissions are most useful to overhear.
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