Degrees of freedom for the MIMO multi-way relay channel

Ye Tian, Aylin Yener

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

    24 Scopus citations

    Abstract

    This paper investigates the degrees of freedom (DoF) of the L-cluster LT-user MIMO multi-way relay channel. A DoF upperbound is derived by providing users with carefully designed genie information, and properly enhancing the received signal of one of the users. For the L-cluster LT-user MIMO multi-way relay channel in the symmetric setting, conditions under which the DoF upperbound can be achieved using either multiple access transmission or signal space alignment are established, demonstrating that the newly derived upperbound is the first tight DoF upperbound for the general MIMO multi-way relay channel. Additionally, this new upperbound proves the optimality of the achievable DoF for several special cases of the MIMO multi-way relay channel obtained in previous works. The results provide the insight that, with fixed spatial dimension at the relay, increasing the number of users and clusters cannot provide any DoF gain. In addition, it is observed that allowing three or more users to share the spatial dimension of the relay cannot provide any DoF gain.

    Original languageEnglish (US)
    Title of host publication2013 IEEE International Symposium on Information Theory, ISIT 2013
    Pages1576-1580
    Number of pages5
    DOIs
    StatePublished - 2013
    Event2013 IEEE International Symposium on Information Theory, ISIT 2013 - Istanbul, Turkey
    Duration: Jul 7 2013Jul 12 2013

    Publication series

    NameIEEE International Symposium on Information Theory - Proceedings
    ISSN (Print)2157-8095

    Other

    Other2013 IEEE International Symposium on Information Theory, ISIT 2013
    CountryTurkey
    CityIstanbul
    Period7/7/137/12/13

    All Science Journal Classification (ASJC) codes

    • Theoretical Computer Science
    • Information Systems
    • Modeling and Simulation
    • Applied Mathematics

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