Relaying for multiple sources in the absence of codebook information

Ye Tian, Aylin Yener

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    7 Scopus citations

    Abstract

    This work investigates the optimality of compress-and-forward (CF) type relaying in wireless networks when the relay does not know the codebooks used by the sources. The relay is called oblivious for this reason. The relay-destination links are assumed to be out-of-band with finite capacity. We study two multi-source relay networks, namely the multiple access relay channel (MARC) and the interference relay channel (IFRC), both with an oblivious relay. For the MARC with an oblivious relay, we derive a new outerbound and show that the capacity region can be established using a generalized CF (GCF) scheme, where the destinations jointly decode the compression indices and the source messages. In particular, we observe that, for multi-source relay networks, GCF scheme achieves higher individual rates than the conventional CF scheme with sequential decoding of compression indices and source messages. For the IFRC with an oblivious relay, we focus on the case where the destinations know all the codebooks used by the sources. We establish a new strong interference condition, under which we derive a new outerbound and show that it is achievable using GCF scheme, thus establishing the capacity region of IFRC with an oblivious relay.

    Original languageEnglish (US)
    Title of host publicationConference Record of the 45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011
    Pages1845-1849
    Number of pages5
    DOIs
    StatePublished - 2011
    Event45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011 - Pacific Grove, CA, United States
    Duration: Nov 6 2011Nov 9 2011

    Publication series

    NameConference Record - Asilomar Conference on Signals, Systems and Computers
    ISSN (Print)1058-6393

    Other

    Other45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011
    CountryUnited States
    CityPacific Grove, CA
    Period11/6/1111/9/11

    All Science Journal Classification (ASJC) codes

    • Signal Processing
    • Computer Networks and Communications

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