HARQ throughput performance of multicode DS-CDMA with MMSE turbo equalization

Kazuaki Takeda, Fumiyuki Adachi

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

    9 Citations (Scopus)

    Abstract

    Hybrid automatic repeat request (HARQ) is an indispensable technique for packet access. This is employed in high speed downlink packet access (HSDPA) using the orthogonal multicode direct sequence code division multiple access (DS-CDMA). As the data rate increases, the frequencyselectivity of the channel becomes severer and some equalization technique other than rake combining is necessary. The use of MMSE frequency-domain equalization (MMSE-FDE) can significantly improve the throughput performance. However, the residual inter-cbip-inference (ICI) after MMSE-FDE produces the orthogonality distortion among the spreading codes and the throughput performance is far from the theoretical lower bound. In this paper, we study an MMSE turbo equalization for HARQ using multicode DS-CDMA It is shown by computer simulation that MMSE turbo equalization can significantly improve the throughput performance. An E s /N 0 reduction of as much as 2.5∼3 dB from the no turbo equalization case is obtained for a throughput range of 2∼2.5 bit/s/Hz.

    Original languageEnglish
    Title of host publication2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring
    Pages1603-1607
    Number of pages5
    DOIs
    Publication statusPublished - 2007 Aug 2
    Event2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring - Dublin, Ireland
    Duration: 2007 Apr 222007 Apr 25

    Publication series

    NameIEEE Vehicular Technology Conference
    ISSN (Print)1550-2252

    Conference

    Conference2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring
    Country/TerritoryIreland
    CityDublin
    Period07/4/2207/4/25

    Keywords

    • Component
    • DS-CDMA
    • Frequency-domain equalization
    • MMSE turbo equalization

    ASJC Scopus subject areas

    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics

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