Title
A discrete-time channel simulator driven by measured scattering functions
Author
van Walree, P.A.
Jenserud, T.
Smedsrud, M.
TNO Defensie en Veiligheid
Publication year
2008
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.
Subject
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
To reference this document use:
http://resolver.tudelft.nl/uuid:ac9355bd-63db-4161-8f44-8843ba256fa8
DOI
https://doi.org/10.1109/jsac.2008.081203
TNO identifier
241249
ISSN
0733-8716
Source
IEEE Journal on Selected Areas in Communications, 26 (9), 1628-1637
Document type
article