Time domain feedback equalizer for fast fading channel in OFDM with scattered pilot

Yutaro Nakagawa, Yukitoshi Sanada

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In this letter, a new feedback equalization scheme to suppress inter-carrier interference (ICI) in an OFDM system using scattered pilot is investigated. On a fast fading channel severe ICI occurs due to a Doppler shift and it deteriorates a bit error rate (BER) seriously because of small subcarrier spacing. In an ISDB-T receiver the equalization is mainly processed in a frequency domain because the scattered pilot is transmitted over the subcarriers. However, the frequency domain equalization may not suppress severe ICI in the case of the fast fading channel with a large Doppler shift. The proposed equalization scheme uses the scattered pilot symbols transformed in a time domain as the reference signal for feedback taps. Numerical results through computer simulation show that the proposed scheme improves the BER performance especially with low carrierto-noise ratio (CNR) conditions.

    Original languageEnglish
    Pages (from-to)2691-2695
    Number of pages5
    JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
    VolumeE93-A
    Issue number12
    DOIs
    Publication statusPublished - 2010 Dec

    Keywords

    • Doppler shift
    • Feedback equalizer
    • ICI
    • ISDB-T
    • OFDM
    • Scattered pilot

    ASJC Scopus subject areas

    • Signal Processing
    • Computer Graphics and Computer-Aided Design
    • Electrical and Electronic Engineering
    • Applied Mathematics

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