NDLI: A performance study of the high-speed, high-frequency acoustic uplink of the HERMES underwater acoustic modem

Content Provider	IEEE Xplore Digital Library
Author	Beaujean, P.-P.J.
Copyright Year	2009
Description	Author affiliation: Florida Atlantic University, SeaTech, 101 North Beach Road, Dania Beach, 33004 USA (Beaujean, P.-P.J.)
Abstract	HERMES is an asymmetrical underwater acoustic modem operating in two separate frequency bands. The high data rate uplink operates between 262 kHz and 375 kHz. The downlink is designed for command-and-control and uses a lower frequency band (62–76 kHz) operated at the same source level but at a lower data rate. The acoustic uplink is capable of achieving data rates of 87768 bits-per-second (bps) in challenging environment such as ports, in the presence of heavy boat traffic. The experimental results acquired over the past year indicate that the high bit-rate uplink of HERMES can operate at this peak data rate at a range of 180 meters, a practical range for many port operations. A unique aspect of this acoustic communication system is the equalization technique, which combines multiple estimations of the underwater acoustic channels into a soft decision error correction process. This technique leads to a significant drop in the bit error rate at the sole expense of processing power.
Starting Page	1
Ending Page	6
File Size	944734
Page Count	6
File Format	PDF
ISBN	9781424425228
DOI	10.1109/OCEANSE.2009.5278282
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Underwater acoustics Modems Frequency Downlink Boats Communication system traffic Decision feedback equalizers Error correction Bit error rate Phase shift keying
Content Type	Text
Resource Type	Article

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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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