NDLI: On the mutual information of time reversal for non-stationary channels

Content Provider	IEEE Xplore Digital Library
Author	Setlur, P. Devroye, N.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Illinois at Chicago, Chicago, IL, USA (Setlur, P.; Devroye, N.)
Abstract	Time-reversal (TR) techniques have been shown to lead to gains in detection and enable super-resolution focusing. These gains have thus far mainly been demonstrated for time invariant channels, where the channel remains constant between the initial and time-reversed signal transmissions. Here, we are interested in determining whether TR techniques may be beneficial in time-varying channels. We approach this problem by comparing the mutual information between the channel and the received signals over two time slots of a radar system which does / does not use TR. Besides evaluating this mutual information, and showing that for this setup it is equal to directed information which might be of interest in feedback-like channels, we also provide a low-rank interpretation of this mutual information for Gaussian channels. Numerical evaluations suggest that if the channels are non-stationary yet correlated, TR may still provide information gains over non time-reversed systems.
Starting Page	3841
Ending Page	3845
File Size	1596944
Page Count	5
File Format	PDF
ISBN	9781479903566
ISSN	15206149
DOI	10.1109/ICASSP.2013.6638377
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Abstracts Signal to noise ratio non-stationary channel Time reversal Radar Mutual Information Stochastic time-varying channel
Content Type	Text
Resource Type	Article

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