Guiding blind transmitters: Relay-aided interference alignment for the X channel

Ye Tian, Aylin Yener

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

    5 Scopus citations

    Abstract

    This paper investigates the impact of half-duplex relays on the degrees of freedom (DoF) of the K-user X channel when the transmitters are blind in the sense that no channel state information (CSI) at the transmitter (CSIT) is available. It is shown that adding relay nodes with CSI to the communication model is sufficient to recover the optimal DoF with CSIT. In particular, the relay nodes help steer the directions of the transmitted signals to facilitate interference alignment to achieve optimal DoF. It is shown that one relay node with K - 1 antennas is sufficient to achieve the optimal DoF. When relays do not have multiple antennas, it is sufficient to have (K - 1) 2 relays to achieve the optimal DoF. The achievability is established using partial interference alignment and joint beamforming. DoF for the case when relays only have delayed CSI is also investigated.

    Original languageEnglish (US)
    Title of host publication2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012
    Pages1513-1517
    Number of pages5
    DOIs
    StatePublished - Oct 22 2012
    Event2012 IEEE International Symposium on Information Theory, ISIT 2012 - Cambridge, MA, United States
    Duration: Jul 1 2012Jul 6 2012

    Publication series

    NameIEEE International Symposium on Information Theory - Proceedings

    Other

    Other2012 IEEE International Symposium on Information Theory, ISIT 2012
    CountryUnited States
    CityCambridge, MA
    Period7/1/127/6/12

    All Science Journal Classification (ASJC) codes

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

    Fingerprint Dive into the research topics of 'Guiding blind transmitters: Relay-aided interference alignment for the X channel'. Together they form a unique fingerprint.

  • Cite this

    Tian, Y., & Yener, A. (2012). Guiding blind transmitters: Relay-aided interference alignment for the X channel. In 2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012 (pp. 1513-1517). [6283517] (IEEE International Symposium on Information Theory - Proceedings). https://doi.org/10.1109/ISIT.2012.6283517