带会议链路的交替中继菱形信道
On the Alternative Relaying Diamond Channel with Conferencing Links
摘要：
在本文中，钻石中继信道被认为是由一个源-目的地对和两个中继节点连接的速率受限的带外会议链路。特别是，我们专注于半双工的替代中继策略，其中两个继电器随着时间的推移交替操作。对于不同的延迟量，提出了两种会议策略，每种会议策略都可以通过一般的双侧会议方案（使用两个会议链路中的两个）或特殊情况的单侧会议方案（仅使用两个会议链路中的一个）来实现。基于最一般的双边会议方案，我们推导出可实现的速率通过使用解码转发（DF）和放大转发（AF）中继方案，并表明这些速率最大化问题是凸的。通过进一步利用最优解的属性，在任意信道条件下，简单的单侧会议与双侧会议在可实现的速率方面一样好。在此基础上，得到了封闭形式的DF率，并建立了单边会议使用哪一条会议链路的原则。此外，DF计划被证明是容量实现在某些条件下，甚至单边会议。对于AF中继方案，单侧会议被证明是次优的一般。最后，数值结果验证了我们的分析。
英文摘要：
In this paper, the diamond relay channel is considered, which consists of one source-destination pair and two relay nodes connected with rate-limited out-of-band conferencing links. In particular, we focus on the half-duplex alternative relaying strategy, in which the two relays operate alternatively over time. With different amounts of delay, two conferencing strategies are proposed, each of which can be implemented by either a general two-side conferencing scheme (for which both of the two conferencing links are used) or a special-case one-side conferencing scheme (for which only one of the two conferencing links is used). Based on the most general two-side conferencing scheme, we derive the achievable rates by using the decode-and-forward (DF) and amplify-and-forward (AF) relaying schemes, and show that these rate maximization problems are convex. By further exploiting the properties of the optimal solutions, the simpler one-side conferencing is shown to be equally good as the two-side conferencing in term of the achievable rates under arbitrary channel conditions. Based on this, the DF rate in closed-form is obtained, and the principle to use which one of the two conferencing links for one-side conferencing is also established. Moreover, the DF scheme is shown to be capacity-achieving under certain conditions with even one-side conferencing. For the AF relaying scheme, one-side conferencing is shown to be sub-optimal in general. Finally, numerical results are provided to validate our analysis.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
