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On Joint Source-Channel Coding for Correlated Sources Over Multiple-Access Relay Channels

机译：多路访问中继信道上相关源的联合源信道编码

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摘要

We study the transmission of correlated sources over discrete memoryless (DM) multiple-access-relay channels (MARCs), in which both the relay and the destination have access to side information arbitrarily correlated with the sources. As the optimal transmission scheme is an open problem, in this paper, we propose a new joint source-channel coding scheme based on a novel combination of the correlation preserving mapping (CPM) technique with Slepian–Wolf (SW) source coding, and obtain the corresponding sufficient conditions. The proposed coding scheme is based on the decode-and-forward strategy, and utilizes CPM for encoding information simultaneously to the relay and the destination, whereas the cooperation information from the relay is encoded via SW source coding. It is shown that there are cases in which the new scheme strictly outperforms the schemes available in the literature. This is the first instance of a source-channel code that uses CPM for encoding information to two different nodes (relay and destination). In addition to sufficient conditions, we present three different sets of single-letter necessary conditions for reliable transmission of correlated sources over DM MARCs. The newly derived conditions are shown to be at least as tight as the previously known necessary conditions.
机译：我们研究了离散无记忆（DM）多路访问中继信道（MARC）上相关源的传输，其中中继站和目的地都可以访问与源任意相关的边信息。由于最优传输方案是一个开放的问题，因此，本文提出了一种新的联合信源信道编码方案，该方案基于相关保留映射（CPM）技术与Slepian-Wolf（SW）源编码的新颖结合，并获得相应的充分条件。提出的编码方案基于解码和转发策略，并利用CPM对同时到中继站和目的地的信息进行编码，而来自中继站的协作信息则通过SW源编码进行编码。结果表明，在某些情况下，新方案严格优于文献中提供的方案。这是使用CPM将信息编码到两个不同节点（中继节点和目标节点）的源通道代码的第一个实例。除了足够的条件外，我们还提供了三组不同的单字母必要条件，以通过DM MARC可靠地传输相关源。新导出的条件显示至少与先前已知的必要条件一样严格。

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