Optimal choice of test signals for linear channel estimation using second order statistics

Article

Braithwaite, Stephen and Addie, Ronald Geoffrey. 2014. "Optimal choice of test signals for linear channel estimation using second order statistics." Optimization and Engineering. 15 (1), pp. 93-118. https://doi.org/10.1007/s11081-012-9193-3
Article Title

Optimal choice of test signals for linear channel estimation using second order statistics

ERA Journal ID36659
Article CategoryArticle
AuthorsBraithwaite, Stephen (Author) and Addie, Ronald Geoffrey (Author)
Journal TitleOptimization and Engineering
Journal Citation15 (1), pp. 93-118
Number of Pages26
Year2014
Place of PublicationNew York, NY. United States
ISSN1389-4420
1573-2924
Digital Object Identifier (DOI)https://doi.org/10.1007/s11081-012-9193-3
Web Address (URL)http://link.springer.com/article/10.1007%2Fs11081-012-9193-3
Abstract

A time-varying acoustic channel may be estimated by an appropriate inference using the output from a periodic test signal. In this paper it is shown how to do this in a way that takes full account of the past history of the background noise and the past history of the channel. An explicit formula is obtained for the optimal linear estimator that may be used for rapid channel estimation for a given test signal when we know the autocovariance or power spectrum of the interfering noise and the autocovariance of the echo channel variation.

Given this closed formula for the optimal estimator of the channel
impulse response, an efficient method for determining the optimal test signal, subject to a constraint on the test signal power, given the history of the channel and the noise, is developed. We show that if the second order statistics of the channel or the noise are known, then the optimal test signal is not white. The method includes an explicit formula for the optimal test signal given a fixed estimator. A model of channel variation which is realistic while having less complexity than a full second-order statistical model, and therefore is more amenable to robust estimation, is used in the experiments which illustrate the
performance of the optimal test signals and the channel estimation
method. Matrix calculus identities required for the derivation of this expression for the optimal estimator are stated and proved in the Appendixes 1 and 2.

Keywordsacoustic; echo; autocovariance; channel estimation; Matlab
ANZSRC Field of Research 2020400607. Signal processing
490304. Optimisation
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Byline AffiliationsSchool of Agricultural, Computational and Environmental Sciences
Institution of OriginUniversity of Southern Queensland
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