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MAP based schemes for detection of double talk and abrupt changes in the echo path for fading channels
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Uppsala University, Sweden.
1998 (English)In: Proceedings of the 9th European Signal Processing Conference, 1998Conference paper (Refereed)
Abstract [en]

An algorithm for discrimination and detection of the two phenomena double talk and abrupt changes in the echo path is proposed for fading channels. Being able to discriminate and detect these two phenomena is crucial since the echo canceler must react differently. The suggested detection scheme is based on a sequential detection approach. The communication channel is modeled as a randomly time-varying linear system. An autoregressive model is used to describe the time evolution of the channel taps. The channel parameters are identified using a Kalman filter coupled with a recursive least squares algorithm, and, based on model assumptions, the maximum a posteriori probabilities corresponding to double talk and abrupt echo path changes are calculated. The proposed scheme is verified experimentally by way of computer simulations.

Place, publisher, year, edition, pages
Keyword [en]
Detection, Echo path, Fading channels, Simulations
National Category
Control Engineering
URN: urn:nbn:se:liu:diva-91584ISBN: 9607620070OAI: diva2:626297
9th European Signal Processing Conference, Island of Rhodes, Greece, September, 1998
Available from: 2013-06-07 Created: 2013-04-28 Last updated: 2013-06-07

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Gustafsson, Fredrik
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Automatic ControlThe Institute of Technology
Control Engineering

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