Performance enhancement of random unitary beamforming based multiuser MIMO systems with optimum combining

Peng Lu, Hong Chuan Yang, Young Chai Ko

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

    Abstract

    Random unitary beamforming (RUB) is an attractive low-complexity transmission scheme for multiuser MIMO broadcast channel. When there are a moderate number of users in the system, the sum rate performance of this signaling scheme becomes mainly interference-limited over high signal-to-noise ratio (SNR) region. In this paper, we study the performance of RUB-based multiuser MIMO systems when optimum combining is employed at mulitple-antenna mobile receivers to suppress multiuser interference. We adopt a geometric approach to derive the statistics of the output signal-to-interference ratio (SIR) of the optimum combiner, based on which a sum rate upper bound is obtained over high SNR region. We show through selected numerical examples that the proposed RUB with optimal combining achieves much better sum rate performance while maintaining low feedback load.

    Original languageEnglish
    Title of host publication2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
    Pages4447-4451
    Number of pages5
    DOIs
    Publication statusPublished - 2008
    Event2008 IEEE Global Telecommunications Conference, GLOBECOM 2008 - New Orleans, LA, United States
    Duration: 2008 Nov 302008 Dec 4

    Publication series

    NameGLOBECOM - IEEE Global Telecommunications Conference

    Other

    Other2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
    Country/TerritoryUnited States
    CityNew Orleans, LA
    Period08/11/3008/12/4

    Keywords

    • And wireless communications
    • MIMO broadcast channel
    • Multiuser diversity
    • Optimum combining
    • Random unitary beamforming
    • Sum- Rate capacity

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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