Relays can provide alignment for the K-user interference channel without channel state information at the transmitters

Ye Tian, Aylin Yener

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

    3 Scopus citations

    Abstract

    Channel state information at the transmitters (CSIT) is of importance for interference alignment schemes to achieve the optimal degrees of freedom (DoF) for wireless networks. This paper focuses on the K-user interference channel and shows that, employing relays between the sources and the destinations, interference alignment is possible without CSIT. Furthermore, the optimal DoF can be achieved with the help of relays. Specifically, a transmission strategy is designed and it is shown that the DoF K/2 can be achieved with a two-slot transmission strategy using either (i) one relay with K - 1 antennas, or (ii) K(K - 2) single antenna relays. It is also shown that when each relay is equipped with L antennas, we need [K(K - 2)/L 2] relays to achieve the optimal DoF.

    Original languageEnglish (US)
    Title of host publication2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
    Pages254-258
    Number of pages5
    DOIs
    StatePublished - 2012
    Event2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012 - Cesme, Turkey
    Duration: Jun 17 2012Jun 20 2012

    Publication series

    NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

    Other

    Other2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
    CountryTurkey
    CityCesme
    Period6/17/126/20/12

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering
    • Computer Science Applications
    • Information Systems

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