Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

Long-range double-differentially coded spread-spectrum acoustic communications with a towed array

TitleLong-range double-differentially coded spread-spectrum acoustic communications with a towed array
Publication TypeJournal Article
Year of Publication2014
AuthorsLiu Z.Q, Yoo K., Yang T.C, Cho SE, Song HC, Ensberg D.E
JournalIeee Journal of Oceanic Engineering
Date Published2014/07
Type of ArticleReview
ISBN Number0364-9059
Accession NumberWOS:000343903200008
Keywordsacoustic communications (LRAC); communications; deep-water; Direct sequence spread spectrum; double-differential coding; equalization; long-range; towed line array; underwater acoustic

This paper presents a novel double-differentially coded spread-spectrum (DD-SS) system design for long-range acoustic communications (LRAC) between a moving source and a towed horizontal line array (HLA). The proposed design relies on two techniques that have been historically developed for radio-frequency terrestrial wireless communications, namely, direct sequence spread spectrum and double-differential coding. In DD-SS, direct sequence spread spectrum is employed to: 1) increase the signal-to-noise ratio; 2) suppress multipath interference; and 3) support data multiplexing, while double-differential coding makes reliable symbol recovery possible without explicit phase and Doppler tracking/correction. Thanks to the two techniques together with traditional beamforming, the DD-SS system is shown capable of effectively dealing with many challenging issues posed by LRAC with a towed HLA, without using complicated receiver processing. During the 2010 Long-Range Acoustic Communication Experiment (LRAC10) in deep waters, the DD-SS system was tested by using a moving source at a speed of 2-3 kn at 75-m depth and a 64-element HLA towed at 3.5 kn at a depth of 200 m. Excellent uncoded error performance (less than 4% bit error rate) is demonstrated at a data rate of 6.4 b/s for a bandwidth of 200 Hz and at a range of 550 km.

Short TitleIEEE J. Ocean. Eng.
Student Publication: 
Research Topics: