Smoothing and interpolation in a pilot-symbol assisted diversity system

Aarne Mämmelä, Veli-Pekka Kaasila

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

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
Volume4
Issue number3
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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Signal to noise ratio
Interpolation
Channel estimation
Power spectrum
Mean square error
Error analysis

Cite this

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title = "Smoothing and interpolation in a pilot-symbol assisted diversity system",
abstract = "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.",
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Smoothing and interpolation in a pilot-symbol assisted diversity system. / Mämmelä, Aarne; Kaasila, Veli-Pekka.

In: International Journal of Wireless Information Networks, Vol. 4, No. 3, 1997, p. 205 - 214.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Mämmelä, Aarne

AU - Kaasila, Veli-Pekka

PY - 1997

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