On joint source-channel coding for correlated sources over multiple-access relay channels

Yonathan Murin, Ron Dabora, Deniz Gündüz

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish
Article number6866893
Pages (from-to)6231-6253
Number of pages23
JournalIEEE Transactions on Information Theory
Volume60
Issue number10
DOIs
StatePublished - 1 Oct 2014

Keywords

  • Multiple-access relay channel
  • correlated sources
  • correlation preserving mapping
  • decode-and-forward
  • joint source and channel coding
  • side information

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