Performance comparison between CDTD and STTD for DS-CDMA/MMSE-FDE with frequency-domain ICI cancellation

Kazuaki Takeda, Yohei Kojima, Fumiyuki Adachi

    Research output: Contribution to journalArticlepeer-review


    Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide a better bit error rate (BER) performance than rake combining. However, the residual inter-chip interference (ICI) is produced after MMSE-FDE and this degrades the BER performance. Recently, we showed that frequency-domain ICI cancellation can bring the BER performance close to the theoretical lower bound. To further improve the BER performance, transmit antenna diversity technique is effective. Cyclic delay transmit diversity (CDTD) can increase the number of equivalent paths and hence achieve a large frequency diversity gain. Space-time transmit diversity (STTD) can obtain antenna diversity gain due to the space-time coding and achieve a better BER performance than CDTD. Objective of this paper is to show that the BER performance degradation of CDTD is mainly due to the residual ICI and that the introduction of ICI cancellation gives almost the same BER performance as STTD. This study provides a very important result that CDTD has a great advantage of providing a higher throughput than STTD. This is confirmed by computer simulation. The computer simulation results show that CDTD can achieve higher throughput than STTD when ICI cancellation is introduced.

    Original languageEnglish
    Pages (from-to)2882-2890
    Number of pages9
    JournalIEICE Transactions on Communications
    Issue number9
    Publication statusPublished - 2009 Sep


    • Cyclic delay transmit diversity (CDTD)
    • DS-CDMA
    • ICI cancellation
    • MMSE-FDE
    • Space-time transmit diversity (STTD)

    ASJC Scopus subject areas

    • Software
    • Computer Networks and Communications
    • Electrical and Electronic Engineering


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