2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization

Yohei Kojima, Kazuaki Takeda, Fumiyuki Adachi

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.

    Original languageEnglish
    Pages (from-to)2065-2071
    Number of pages7
    JournalIEICE Transactions on Communications
    VolumeE92-B
    Issue number6
    DOIs
    Publication statusPublished - 2009 Jun

    Keywords

    • Channel estimation
    • DS-CDMA
    • Frequency-domain equalization
    • MMSE

    ASJC Scopus subject areas

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

    Fingerprint

    Dive into the research topics of '2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization'. Together they form a unique fingerprint.

    Cite this