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

Surinder Singh, Mark Crispo, Jean-François Bousquet and Shadi Aljendi

International Journal of Distributed Sensor Networks, 2021, vol. 17, issue 4, 15501477211010663

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.

Keywords: Software-defined modem; underwater communications; multiple-input multiple-output; channel characterization; field-programmable gate arrays (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:sae:intdis:v:17:y:2021:i:4:p:15501477211010663

DOI: 10.1177/15501477211010663

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