IQ imbalance compensation scheme in the presence of frequency offset and dynamic dc offset for a direct conversion receiver

Mamiko Inamori, Anas M. Bostamam, Yukitoshi Sanada, Hideki Minami

    Research output: Contribution to journalArticle

    33 Citations (Scopus)

    Abstract

    A direct conversion architecture reduces the cost and power consumption of a receiver. However, a direct conversion receiver may suffer from direct current (DC) offset, frequency offset, and IQ imbalance. This paper presents an IQ imbalance estimation scheme for orthogonal frequency division multiplexing (OFDM) direct conversion receivers. The proposed IQ imbalance estimation scheme operates in the presence of dynamic DC offset and frequency offset. The proposed scheme calculates IQ imbalance from a simple equation. It employs the knowledge of the preamble symbols of the IEEE 802.11 a/g standards, while it does not require the impulse response of the channel. Numerical results obtained through computer simulation show that the bit error rate (BER) performance for the proposed IQ imbalance estimation scheme has a degradation of about 4dB with a large DC offset, frequency offset, and IQ imbalance.

    Original languageEnglish
    Pages (from-to)2214-2220
    Number of pages7
    JournalIEEE Transactions on Wireless Communications
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - 2009 May 1

    Keywords

    • Dc offset
    • Direct conversion
    • Frequency offset
    • Iq imbalance
    • OFDM
    • Training sequence

    ASJC Scopus subject areas

    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics

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