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


    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
    Publication date2007
    ISBN (Print)978-1-4244-1043-9
    Publication statusPublished - 2007
    Event2007 IEEE Global Telecommunications Conference - Washington, United States
    Duration: 25 Nov 200730 Nov 2007
    Conference number: 50


    Conference2007 IEEE Global Telecommunications Conference
    Country/TerritoryUnited States
    Internet address

    Bibliographical note

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