Instantaneous degrees of freedom of downlink interference channels with multiuser diversity

Taejoon Kim, David J. Love, Bruno Clerckx

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

    1 Citation (Scopus)

    Abstract

    Independent channel fading across different users in a wireless network enables the system to exploit multiuser diversity. In this paper, we investigate the impact of user scheduling on the instantaneous degrees of freedom of multiple interfering cellular networks. Particularly, we consider a homogeneous multiple cellular downlink scenario with multiple users per cell. We show that if the number of users in a cell scales faster than linearly with SNR, the instantaneous degrees of freedom with multiuser diversity increases and converges to L in both mean-square (m.s.) sense and almost sure (a.s.) sense for an L-cell downlink interference channel, even though very limited channel feedback is needed. Each user is equipped with L-1 antennas to capture the multidimensional out-of-cell interference from other base stations, while the base station has a single antenna. The user scheduling strategy that achieves L instantaneous degrees of freedom is to poll users experiencing only a small amount of out-of-cell interference. The instantaneous degrees of freedom with multiuser diversity and its convergence mode are compared to those of conventional interference alignment. Furthermore, the user scaling law is relaxed when ergodic throughout is analyzed.

    Original languageEnglish
    Title of host publicationConference Record of the 45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011
    Pages1293-1297
    Number of pages5
    DOIs
    Publication statusPublished - 2011
    Event45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011 - Pacific Grove, CA, United States
    Duration: 2011 Nov 62011 Nov 9

    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
    Country/TerritoryUnited States
    CityPacific Grove, CA
    Period11/11/611/11/9

    ASJC Scopus subject areas

    • Signal Processing
    • Computer Networks and Communications

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