Underwater communication link with iterative equalization

Author

Öberg, Tommy ; Nilsson, Bernt ; Olofsson, Niten ; Nordenvaad, Magnus Lundberg ; Sangfelt, Erland

Author_Institution

Swedish Defence Res. Agency, Stockholm

fYear

2006

fDate

18-21 Sept. 2006

Firstpage

1

Lastpage

6

Abstract

In this paper an acoustic underwater communication link is presented. The channel has severe inter symbol interference, which is dealt with by an iterative linear equalizer and a Turbo code. Experiments has been performed in the Baltic Sea using a 4QAM signal with bandwidth 4 kHz at a center frequency of 12 kHz. The raw data rate is 8 kbit/s but after reduction for error correction coding the net bit rate is 2.88 kbit/s. With a source level of 180 dB re. 1mu/Pa @ 1m and a single hydrophone receiver, a reliable communication is shown up to a distance of 60 km. Very important for a successful decoding is the initial synchronization, which also is discussed

Keywords

equalisers; error correction codes; hydrophones; turbo codes; underwater acoustic communication; 4QAM signal; Baltic Sea; Turbo code; acoustic underwater communication; error correction coding; hydrophone receiver; iterative linear equalizer; Bandwidth; Bit rate; Equalizers; Error correction codes; Frequency; Interference; Sonar equipment; Turbo codes; Underwater acoustics; Underwater communication;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS 2006

Conference_Location

Boston, MA

Print_ISBN

1-4244-0114-3

Electronic_ISBN

1-4244-0115-1

Type

conf

DOI

10.1109/OCEANS.2006.307059

Filename

4098878