NDLI: Performance of channel-equalized acoustic communications in the surf zone

Content Provider	IEEE Xplore Digital Library
Author	Green, D. Blackmon, F.
Copyright Year	2001
Description	Author affiliation: Benthos Inc., North Falmouth, MA, USA (Green, D.)
Abstract	The Surf Zone Acoustic Telemetry Experiment (SZATE) was conducted during August and September 2000 alongside the pier at Scripps Institution of Oceanography. The goal was to characterize the relationships between the performance of acoustic communications and observable oceanographic and acoustic conditions. As part of our participation in SZATE, we designed and transmitted messages by means of both non-coherent signaling methods, and channel-equalized, coherent methods. The latter involved a 3220 bps QPSK message with accompanying channel probes. More than 20,000 such waveforms were processed and analyzed, with channel conditions ranging from benign to unusable. Channel equalization was accomplished with decision feedback equalizers based on the LMS, RLS, and fast RLS implementations. Due to rapid temporal variations in the channel impulse response, the basic LMS algorithm was generally ineffective. The RLS and fast RLS algorithm performance were comparable, with the latter providing slightly superior performance in terms of residual uncorrected channel symbol errors. Equalizer tap placement was determined from a heuristic algorithm which provided excellent results. The presence of bubbles may dominate signaling performance by blocking the channel. Bubbles are either injected into the water column from breaking waves, or are advected by along-shore currents. However, the channel is generally "open" and in such cases the percent of successful messages ranged from approximately 50% to 98%, with an average of approximately 80%. Temporal diversity is shown to substantially improve this success rate. The performance in the absence of bubbles is correlated with the temporal coherence of each of the major multipath arrivals.
Starting Page	2262
Ending Page	2269
File Size	766458
Page Count	8
File Format	PDF
ISBN	0933957289
DOI	10.1109/OCEANS.2001.968350
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Marine Technology Soc.
Subject Keyword	Resonance light scattering Sonar equipment Acoustical engineering Telemetry Underwater communication Decision feedback equalizers Least squares approximation Sea measurements Signal design Quadrature phase shift keying
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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