NDLI: Tracking channel variations in a time-varying doubly-spread underwater acoustic channel

Content Provider	IEEE Xplore Digital Library
Author	Huang, S. H. Yang, T. C. Xu, W.
Copyright Year	2015
Description	Author affiliation: Dept. of Ocean Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China (Huang, S. H.) \|\| College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China (Yang, T. C.; Xu, W.)
Abstract	Channel impulse responses (CIRs) are estimated for a doubly-spread acoustic channel in this paper by (1) estimating explicitly the path-dependent Doppler frequency shifts assuming a time-invariant CIR for individual blocks of data, and (2) estimating the time-varying CIR symbol by symbol including the phase change due to the Doppler. For the latter, a subspace based tracker is used to track the time variation of the channel basis vectors with their amplitudes tracked using a Kalman filter aided with a state-space model. For each method, the performance is measured by the normalized signal prediction error, the error between the data and the predicted signal based on the estimated CIRs, assuming the transmitted signal is known. Analysis of at sea data shows a 7 dB improvement in signal prediction error by tracking CIR using the model-based approach compared with the conventional methods based on explicit Doppler estimation.
Starting Page	1
Ending Page	7
File Size	1286697
Page Count	7
File Format	PDF
ISBN	9780933957435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Channel estimation Doppler shift Estimation Baseband Delays Underwater acoustics subspace tracking Doubly spread acoustic channels delay-Doppler-spread function underwater acoustic communications
Content Type	Text
Resource Type	Article

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