On Sphere Detection and Minimum-Phase Prefiltered Reduced-State Sequence Estimation

Morten Hansen, Lars P.B. Christensen, Ole Winther

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    In this paper, prefiltering techniques for Sphere Detection (SD) in frequency-selective channels are examined. It is shown that a link between QL-factorization of the channel matrix and minimum-phase prefiltering exists. As a result, it ispossible to regard SD as a generalization of traditional reducedstate sequence estimation, providing a unifying framework for the two detection methods. It is illustrated how minimum-phase prefiltering or the Linear Minimum Mean-Square Error Decision Feedback Equalization (LMMSE-DFE) forward filter is capable of reducing the complexity of sphere detectors significantly, while still obtaining near-optimal performance. The significant reduction in complexity is obtained as prefiltering enables earlier decision making in SD. Simulations carried out in an EDGE system confirm that prefiltering leads to a considerable complexity reduction for sphere detectors.
    Original languageEnglish
    Title of host publicationGlobal Telecommunications Conference, GLOBECOM '07. IEEE, 26-30 Nov. 2007
    PublisherIEEE
    Publication date2007
    Pages4237-4241
    ISBN (Print)978-1-4244-1043-9
    DOIs
    Publication statusPublished - 2007
    EventGlobal Telecommunications Conference, GLOBECOM '07. IEEE, 26-30 Nov. 2007 -
    Duration: 1 Jan 2007 → …

    Conference

    ConferenceGlobal Telecommunications Conference, GLOBECOM '07. IEEE, 26-30 Nov. 2007
    Period01/01/2007 → …

    Bibliographical note

    Copyright: 2007 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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