Channel estimation versus equalization in an OFDM WLAN system

Sandrine Boumard, Aarne Mämmelä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    17 Citations (Scopus)


    We study an OFDM system, following the IEEE 802.11a standard, with QPSK modulation, allowing a 10 Mbps data rate when using convolutional coding. We compare one-tap equalization and channel estimation structures in the frequency domain by theoretical analysis and floating point simulations. We use the minimum mean square error (MMSE) and the zero-forcing (ZF) criteria. In the adaptive case, we use the RLS algorithm. We compare data aided (using pilot tones), and decision directed modes. The analysis is made for AWGN, one path Rayleigh fading, one path Ricean fading and multipath Ricean fading channels. The ZF criterion performs better than the MMSE criterion. The channel estimator is simpler and performs better than the equalizer in Ricean fading channels. This paper proposes new insights on the ZF and MMSE criteria, equalization and channel estimation.
    Original languageEnglish
    Title of host publicationIEEE VTS 53rd Vehicular Technology Conference, Spring 2001
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Print)978-0-7803-6728-9
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    Event53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring: Connecting the mobile world - Rhodes, Greece
    Duration: 6 May 20019 May 2001
    Conference number: 53

    Publication series

    SeriesIEEE Vehicular Technology Conference Proceedings


    Conference53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring


    • channel estimation
    • wireless LAN
    • modulation coding
    • OFDM modulation
    • analytical models
    • IEEE 802.11a standard
    • WLAN system
    • fading


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