NDLI: Experimental assessment of a multiple sequence direct sequence spread spectrum (MS-DSSS) underwater acoustic communication scheme

Content Provider	IEEE Xplore Digital Library
Author	Qiao Gang Ismail, A. Feng Zhou Liu Song Zuo
Copyright Year	2013
Description	Author affiliation: Coll. of Underwater Acoust. Eng., Harbin Eng. Univ., Harbin, China (Qiao Gang; Ismail, A.; Feng Zhou; Liu Song Zuo)
Abstract	This paper describes analysis of data acquired during lake trials of multiple sequence direct sequence spread spectrum (MS-DSSS) system carried out in very shallow water (20-50 m) areas with uneven bottom. The transmitted signals, which consist of frames of multiple spreading sequences, are modulated using coherent phase shift keying. The use of multiple pseudo noise sequences (PN) in a single frame allows one to achieve robust communication with a relatively simple receiver structure as compared to traditional single spreading sequence approach. This long code multiple sequence approach also helps in realizing low probability of intercept (LPI) communication. On the receiver side, a rake type receiver collects the energy present in multiple propagation paths after synchronization and Doppler compensation. Channel estimation necessary for the correct working of rake receiver is done together with a Doppler tracking that allows an adaptation to the instantaneous channel variations. The analysis of the trial data shows that the developed communication algorithm can overcome multipath propagation and Doppler shifts typically present in shallow water channels. The results of the lake trials show that the proposed system gives good performances up to 75 bits per second to a horizontal range of more than four kilometer in a complex shallow water channel. The post processing of the data also shows that we can further enhanced data rate if CDMA approach is employed to transmit parallel data using more PN sequences simultaneously.
Sponsorship	IEEE Oceanic Eng. Soc.
Starting Page	1
Ending Page	6
File Size	1321026
Page Count	6
File Format	PDF
ISBN	9780933957404
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Synchronization Correlation Doppler effect Receivers Lakes Channel estimation Spread spectrum communication Shallow Water DSSS
Content Type	Text
Resource Type	Article

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