2023_programme: MIMO-OFDM for Internet of Underwater Things

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  • Session: 19. Underwater Communications and Networking
    Organiser(s): Charalampos Tsimenidis, Paul Mitchell and Konstantinos Pelekanakis
  • Lecture: MIMO-OFDM for Internet of Underwater Things [invited]
    Paper ID: 2054
    Author(s): Shi Jiacheng, Demirors Emrecan, Melodia Tommaso
    Presenter: Shi Jiacheng
    Abstract: To meet the rising need for underwater research, a platform with higher data rates, more reliable performance, and hardware and software flexibility is required. OFDM is a low-complexity alternative to single-carrier transmission for optimizing the utilization of the available bandwidth. On the other hand, MIMO techniques may significantly boost the narrow band channel capacity. MIMO-OFDM is thus the preferred method for high-data-rate transmissions across underwater acoustic channels. In this work, a new MIMO-OFDM transceiver configuration is suggested. We show a prototype of a 2x2 MIMO-OFDM transceiver node for the Internet of Underwater Things (IoUT), which intends to build a new generation of programmable and portable platforms a networking testbed with real-time processing and reconfiguration. The suggested receiver operates on a block-by-block basis, using pilot subcarriers for channel estimation to prevent matrix inversion and accommodate the hardware's limited resources. We also use space-frequency block coding (SFBC) for transmission diversity. In addition, null-carrier based Doppler compensation enables high-resolution uniform Doppler drifting. We assess the performance of MIMO-OFDM with 8192 subcarriers in Boston Harbor's open water region. TX and RX transducers are separated by 2 meters at a depth of 4 meters. The transmission employs a 125 kHz bandwidth and a 125 kHz carrier frequency. We show that the suggested MIMO-OFDM IUoT prototype can support data speeds of up to 600kbit/s with 16QAM modulation with 0.002 BER with BPSK-SFBC.
      Download the full paper
  • Corresponding author: Mr Jiacheng Shi
    Affiliation: Northeastern University
    Country: United States
    e-mail:

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