Performance of different interpolation strategies for an OFDM/MMSE smart antenna system in an indoor WLAN

Karim M. Nasr, Fumie Costen, Stephen K. Barton

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

    Abstract

    This paper assesses the performance of different interoplation strategies for an OFDM/MMSE smart antenna serving multiple users through Space Division Multiple Access (SDMA) in a Wireless LAN following the IEEE 802.11a/e or HIPERLAN/2 standards. The frequency dependence of the channel transfer matrix and the weights is studied in indoor environments of different dimensions and for different coherence bandwidths using a ray-tracing tool. Interpolation is proposed to reduce the complexity of calculating the smart antenna weights at every OFDM subcarrier. The performance of different interpolation strategies is investigated in terms of complexity and Signal to Interference plus Noise Ratio (SINK) degradation relative to the case where the weights are calculated at every subcarrier. Simulation results agree with the expected behaviour showing that FIT based interpolation generally outperforms linear interpolation when the span between calculated subcarriers is less than 16. Channel transfer matrix based interpolation outperforms weight matrix based interpolation at the cost of increased complexity. © 2005 IEEE.
    Original languageEnglish
    Title of host publicationIEEE Vehicular Technology Conference|IEEE Veh Technol Conf
    Pages177-181
    Number of pages4
    Volume61
    Publication statusPublished - 2005
    Event2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future - Stockholm
    Duration: 1 Jul 2005 → …

    Conference

    Conference2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future
    CityStockholm
    Period1/07/05 → …

    Keywords

    • Infrastructure WLAN
    • MMSE Beamfarming
    • OFDM
    • SDMA
    • Smart Antennas
    • Spatial Indoor Channel Model

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