Partial interference subspace rejection in CDMA systems

Henrik Hansen, Sofiene Affes, Paul Mewelstein

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    Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB
    Original languageEnglish
    Title of host publicationProceedings on IEEE 53rd Vehicular Technology Conference
    Publication date2001
    ISBN (Print)0-7803-6728-6
    Publication statusPublished - 2001
    EventIEEE VTS 53rd Vehicular Technology Conference - , Greece
    Duration: 6 May 20019 May 2001
    Conference number: 53


    ConferenceIEEE VTS 53rd Vehicular Technology Conference
    Internet address

    Bibliographical note

    Copyright: 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


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