Frequency offset estimation scheme in the presence of time-varying DC offset for OFDM direct conversion receivers

Mamiko Inamori, Anas Muhamad Bostamam, Yukitoshi Sanada, Hideki Minami

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    This paper presents a frequency offset estimation scheme for Orthogonal Frequency Division Multiplex (OFDM) direct conversion receivers. The key idea is to use a differential filter for reduction of DC offset. Frequency offset is estimated in the presence of time-varying DC offset. In order to overcome the varying DC levels under automatic gain control (AGC) circuits, a threshold level is set for the output of the differential filter. The proposed compensation scheme offers superior frequency offset estimation when compared with a conventional scheme with a high pass filter.

    Original languageEnglish
    Pages (from-to)2884-2890
    Number of pages7
    JournalIEICE Transactions on Communications
    VolumeE90-B
    Issue number10
    DOIs
    Publication statusPublished - 2007 Jan 1

    Keywords

    • DC offset
    • Direct conversion
    • Frequency offset
    • OFDM
    • Training sequence

    ASJC Scopus subject areas

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

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