Channel estimation versus equalization in an OFDM WLAN system

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

    17 Citations (Scopus)

    Abstract

    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
    Pages653-657
    ISBN (Print)0-7803-6728-6
    DOIs
    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

    Conference

    Conference53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring
    CountryGreece
    CityRhodes
    Period6/05/019/05/01

    Fingerprint

    Channel estimation
    Wireless local area networks (WLAN)
    Mean square error
    Orthogonal frequency division multiplexing
    Fading channels
    Fading (radio)
    Multipath fading
    Quadrature phase shift keying
    Equalizers
    Rayleigh fading
    Modulation

    Keywords

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

    Cite this

    Boumard, S., & Mämmelä, A. (2001). Channel estimation versus equalization in an OFDM WLAN system. In IEEE VTS 53rd Vehicular Technology Conference, Spring 2001 (pp. 653-657). IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/VETECS.2001.944924
    Boumard, Sandrine ; Mämmelä, Aarne. / Channel estimation versus equalization in an OFDM WLAN system. IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. IEEE Institute of Electrical and Electronic Engineers , 2001. pp. 653-657
    @inproceedings{281c515eecb945bb886c250f194c04de,
    title = "Channel estimation versus equalization in an OFDM WLAN system",
    abstract = "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.",
    keywords = "channel estimation, wireless LAN, modulation coding, OFDM modulation, analytical models, IEEE 802.11a standard, WLAN system, fading",
    author = "Sandrine Boumard and Aarne M{\"a}mmel{\"a}",
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    Boumard, S & Mämmelä, A 2001, Channel estimation versus equalization in an OFDM WLAN system. in IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. IEEE Institute of Electrical and Electronic Engineers , pp. 653-657, 53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring, Rhodes, Greece, 6/05/01. https://doi.org/10.1109/VETECS.2001.944924

    Channel estimation versus equalization in an OFDM WLAN system. / Boumard, Sandrine; Mämmelä, Aarne.

    IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. IEEE Institute of Electrical and Electronic Engineers , 2001. p. 653-657.

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

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    AB - 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.

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    Boumard S, Mämmelä A. Channel estimation versus equalization in an OFDM WLAN system. In IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. IEEE Institute of Electrical and Electronic Engineers . 2001. p. 653-657 https://doi.org/10.1109/VETECS.2001.944924