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1.
  • Nordenvaad, Magnus Lundberg, et al. (author)
  • Iterative reception for acoustic underwater MIMO communications
  • 2006
  • In: Oceans 2006. - : IEEE Communications Society. - 1424401143
  • Conference paper (peer-reviewed)abstract
    • This paper presents a soft input/soft output linear equalizer for Alamouti encoded MIMO signals. The derived structure allows for simultaneous equalization of MIMO channels and decoding of Alamouti coded signals. The equalizer/decoder is here used within the turbo equalization framework to exploit the complex and rich characteristics of the acoustic underwater channel. Such schemes can operate ate very low signal-to-noise ratio (SNR) levels enabling high transmission rates over long distances. We investigate the viability of the technique by using a simulation example and by studying its behavior for a real scenario, using data collected in the Baltic Sea
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2.
  • Öberg, T., et al. (author)
  • Underwater communication link with iterative equalization
  • 2006
  • In: OCEANS 2006. - : IEEE Communications Society. - 1424401143
  • Conference paper (peer-reviewed)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.
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  • Result 1-2 of 2
Type of publication
conference paper (2)
Type of content
peer-reviewed (2)
Author/Editor
Nordenvaad, Magnus L ... (2)
Nilsson, B (1)
Öberg, T (1)
Olofsson, N (1)
Öberg, Tommy (1)
Sangfelt, E. (1)
University
Luleå University of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Engineering and Technology (2)
Year
2006 (2)

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