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A discrete-time channel simulator driven by measured scattering functions

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Author: Walree, P.A. van · Jenserud, T. · Smedsrud, M.
Type:article
Date:2008
Institution: TNO Defensie en Veiligheid
Source:IEEE Journal on Selected Areas in Communications, 9, 26, 1628-1637
Identifier: 241249
doi: doi:10.1109/JSAC.2008.081203
Keywords: Acoustic signal processing · Discrete-time filters · Time-varying channels · Underwater acoustic communication · Acoustic signal processing · Acoustics · Coherent light · Communication channels (information theory) · Continuous time systems · Doppler effect · Error correction · Probability density function · Rayleigh fading · Scattering · Signal processing · Simulators · Telecommunication equipment · Wireless telecommunication systems · Channel simulators · Doppler corrections · Feedback equalizers · In-situ · Mean squares · Multipath · Operation modes · Phase correlations · Platform motions · Scattering functions · Synthetic datums · Tap gains · Temporal coherences · Time channels · Time-varying channels · Uncorrelated scatterings · Acoustic wave scattering

Abstract

In-situ measurements of the scattering function are used to drive a channel simulator developed in the context of underwater acoustic telemetry. Two operation modes of the simulator are evaluated. A replay mode is accomplished by interpolation of measured impulse responses. A second, stochastic mode delivers multiple realizations of a given scattering function. The initial assumption of wide-sense stationary uncorrelated scattering is violated by strong phase correlations between taps. It is shown that time-varying Doppler shifts due to platform motion must be eliminated from measured scattering functions in order to provide the stochastic tap gains with the true Doppler spectrum of the channel. The simulator is validated through a comparison of acoustic data measured at sea, and emulated data, governed by the same scattering function. This comparison is based on scattering and coherence functions, multipath phase measurements, and application of a decision-feedback equalizer. After the Doppler correction, the synthetic data are indistinguishable from the acoustic data in terms of delay-Doppler spread, temporal coherence, phase behavior, equalizer mean square error, and bit error ratio.