Dynamic linear precoding for the exploitation of known interference in MIMO broadcast systems

Christos Masouros, Emad Alsusa

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    This paper introduces a novel channel inversion (CI) precoding scheme for the downlink of phase shift keying (PSK)-based multiple input multiple output (MIMO) systems. In contrast to common practice where knowledge of the interference is used to eliminate it, the main idea proposed here is to use this knowledge to glean benefit from the interference. It will be shown that the system performance can be enhanced by exploiting some of the existent inter-channel interference (ICI). This is achieved by applying partial channel inversion such that the constructive part of ICI is preserved and exploited while the destructive part is eliminated by means of CI precoding. By doing so, the effective signal to interference-plus-noise ratio (SINR) delivered to the mobile unit (MU) receivers is enhanced without the need to invest additional transmitted signal power at the MIMO base station (BS). It is shown that the trade-off to this benefit is a minor increase in the complexity of the BS processing. The presented theoretical analysis and simulations demonstrate that due to the SINR enhancement, significant performance and throughput gains are offered by the proposed MIMO precoding technique compared to its conventional counterparts. © 2006 IEEE.
    Original languageEnglish
    Article number4801492
    Pages (from-to)1396-1404
    Number of pages8
    JournalIEEE Transactions on Wireless Communications
    Issue number3
    Publication statusPublished - Mar 2009


    • Adaptive signal processing
    • Channel inversion
    • Interference multiuser channels
    • MIMO systems
    • Precoding


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