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Adaptive equalization of indoor radio channels for 156-Mb/s, QPSK data transmission

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Abstract

Indoor radio communication in the 20–60 GHz band using TDMA with differentially encoded QPSK is consideed. A burst-type transmission, based on a basic time slot consisting of a preamble for synchronization and equalizer training and of an information data section, is adopted. We employ fractionally spaced decision feedback equalization and give the relevant analytical and simulated performance results in terms of Doppler frequency. An upper limit is determined for the channel variations which can be tracked by the equalizer. Performance results are obtained for equalization with and without carrier phase recovery. Calculated and simulated probability of error show that error propagation degrades the performance by about 6 dB at a bit error rate of 10−3 for a channel without any diversity. However, the effect of past decision errors is negligible for dual diversity. Numerical stability, required accuracy, and hardware complexity are also discussed.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Toronto, M5S 1A4, Toronto, Ontario, Canada

    Ali Masoomzadeh-Fard & Subbarayan Pasupathy

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  1. Ali Masoomzadeh-Fard
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  2. Subbarayan Pasupathy
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Masoomzadeh-Fard, A., Pasupathy, S. Adaptive equalization of indoor radio channels for 156-Mb/s, QPSK data transmission. Int J Wireless Inf Networks 3, 105–115 (1996). https://doi.org/10.1007/BF02107051

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