Smoothing and interpolation in a pilot-symbol assisted diversity system

Aarne Mämmelä, Veli-Pekka Kaasila

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)


    The performance of a suboptimal diversityreceiver in a frequency-nonselective slow Rayleighfading AWGN channel is analyzed. The channel isestimated by using pilot symbols that aretime-multiplexed with the data symbols in the transmitted signal. Theestimator is based on time-variant smoothing, and it canbe approximated by time-invariant smoothing andinterpolation. The paper includes both mean-square error analysis and bit error probabilityanalysis. The results are verified by some typicalperformance curves. It is shown that under suitableconditions (no aliasing in channel estimation), thesystem based on a time-invariant smoother and an idealinterpolator has the same performance as thetime-variant smoother and does not have any error-ratebottoming effect at large signal-to-noise ratios. Atsmall signal-to-noise ratios, the smoother must bematched to the Doppler power spectrum of the channel.The ideal interpolator can usually be approximated by alinear interpolator.

    Original languageEnglish
    Pages (from-to)205 - 214
    Number of pages10
    JournalInternational Journal of Wireless Information Networks
    Issue number3
    Publication statusPublished - 1997
    MoE publication typeA1 Journal article-refereed


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