IQ imbalance estimation scheme in the presence of DC offset and frequency offset in the frequency domain

Mamiko Inamori, Shuzo Takayama, Yukitoshi Sanada

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.

    Original languageEnglish
    Pages (from-to)2688-2696
    Number of pages9
    JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
    VolumeE92-A
    Issue number11
    DOIs
    Publication statusPublished - 2009 Nov

    Keywords

    • DC offset
    • Direct conversion
    • Frequency offset
    • IQ imbalance
    • OFDM
    • Pilot symbols

    ASJC Scopus subject areas

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

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