NDLI: Tracking time-varying correlated underwater acoustic channels in the signal subspace

Content Provider	ACM Digital Library
Author	Tsao, Jenho Yang, T. C. Huang, S. H.
Abstract	Multipath arrivals in many underwater acoustic channels are often cross-correlated and as a result, the path cross-correlation matrix shows a smaller rank than the number of multipath delay taps. Channel tracking error, measured in terms of the signal prediction error, can be significantly reduced by tracking the signal components in the signal subspace as previously demonstrated for a slowly varying channel in which the signal basis vectors can be assumed to be time-invariant. For a rapidly time-varying channel, one needs to track the time variation of the signal basis vectors. A subspace tracker is used in this paper based on a coarse estimate of the channel impulse response (CIR). The channel amplitudes (components) are tracked using a recursive least squares method. Performance of the proposed algorithms is demonstrated with real sea data and compared with that obtained with conventional approaches. The results demonstrate the importance of tracking the channel basis vectors as well as the channel components.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISBN	9781450325844
DOI	10.1145/2532378.2532411
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-11-11
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Acoustic communication Subspace tracking Channel tracking Non-wssus channel
Content Type	Text
Resource Type	Article

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Tracking time-varying correlated underwater acoustic channels in the signal subspace