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A Janus compatible software-defined underwater acoustic multiple-input multiple-output modem

Author

Listed:
  • Surinder Singh
  • Mark Crispo
  • Jean-François Bousquet
  • Shadi Aljendi

Abstract

This article describes the implementation of a multiple-input multiple-output acoustic communication link in shallow water conditions to enable a software-defined acoustic modem with a maximum transmission rate of 20 kbps in a 5-kHz bandwidth. The reliability improvement of a low-complexity Alamouti space–time block code is evaluated to improve the diversity in a high-rate transmission mode using single carrier modulation, as well as in a low-rate transmission mode relying on continuous-phase frequency-shift keying. Using measurements in realistic subsea conditions, the effect of the spatial channel correlation is demonstrated. It is found that for the space–time block code/continuous-phase frequency-shift keying, the spatial diversity is significantly degraded due to the high spatial correlation. In contrast, for the high-mode transmission rate, space–time block code with single carrier modulation offers a bit error rate improvement by a factor over hundred, in comparison to a single transmit element, demonstrating that the multiple-input multiple-output optimal code depends on the software-defined acoustic modem transmission mode.

Suggested Citation

  • Surinder Singh & Mark Crispo & Jean-François Bousquet & Shadi Aljendi, 2021. "A Janus compatible software-defined underwater acoustic multiple-input multiple-output modem," International Journal of Distributed Sensor Networks, , vol. 17(4), pages 15501477211, April.
    • Handle: RePEc:sae:intdis:v:17:y:2021:i:4:p:15501477211010663
    DOI: 10.1177/15501477211010663
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