title: Long-range multi-carrier acoustic communications in shallow water based on iterative sparse channel estimation.
abstract: Long-range orthogonal frequency division multiplexing (OFDM) acoustic communications is demonstrated using data from the Kauai Acomms MURI 2008 (KAM08) experiment carried out in about 106 m deep shallow water west of Kauai, HI, in June 2008. The source bandwidth was 8 kHz (12-20 kHz), and the data were received by a 16-element vertical array at a distance of 8 km. Iterative sparse channel estimation is applied in conjunction with low-density parity-check decoding. In addition, the impact of diversity combining in a highly inhomogeneous underwater environment is investigated. Error-free transmission using 16-quadtrative amplitude modulation is achieved at a data rate of 10 kb/s.
authors.affiliation: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA. tedkang@ucsd.edu
authors.forename: Taehyuk
authors.initials: T
authors.lastname: Kang
authors.forename: H C
authors.initials: HC
authors.lastname: Song
authors.forename: W S
authors.initials: WS
authors.lastname: Hodgkiss
authors.forename: Jea
authors.initials: J
authors.lastname: Soo Kim
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D008962:Models, Theoretical; D009038:Motion; D011825:Radar / Q000295:instrumentation; D012623:Seawater; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors