2019_programme: A TANK EXPERIMENT OF UNDERWATER ACOUSTIC MIMO COMMUNICATION USING TIME REVERSAL.



  • Session: 05. Underwater Communications and Networking
    Organiser(s): Tsimenidis Charalampos, Mitchell Paul, Pelekanakis konstantinos
  • Lecture: A TANK EXPERIMENT OF UNDERWATER ACOUSTIC MIMO COMMUNICATION USING TIME REVERSAL.
    Paper ID: 824
    Author(s): Kida Yukihiro, Shimura Takuya, Deguchi Mitsuyasu
    Presenter: Kida Yukihiro
    Presentation type: oral
    Abstract: An underwater acoustic tank experiment of a high-rate multiple-input/multiple-output (MIMO) by using a time reversal communication technique is demonstrated. Time reversal is known as an effective method for channel equalization in underwater acoustic communication. Its high temporal and spatial focusing can be utilized for MIMO communication by realizing space division multiplexing (SDM).\nIn this study, the adaptive time reversal (ATR) communication technique was used to enhance the focusing/defocusing ability to remove the co-channel interference in MIMO communication. The ATR is followed by a decision feedback equalizer (DFE) to remove the residual interferences. We mainly focused on the investigation of the performance for the capability of SDM based MIMO communication of this ATR-DFE scheme.\nThe capability of the ATR-DFE scheme for MIMO communication under an echoic underwater acoustic channel environment was investigated by two experiments in a rectangular echoic water tank. At the first experiment, we investigated 4x10 MIMO communication utilizing the signal of 16-24 kHz bandwidth with toroidal transducers. The second experiment was 5x12 MIMO communication utilizing the signal of 60-80 kHz bandwidth with directional transducers. In both experiments, the communication signals were modulated by single-career modulation scheme. \nAs a result, error-free detections were succeeded in both experiments by the ATR-DFE without any forward error correction schemes in the highly coherent environment, where many multipath with long duration (200ms at most) were observed. The maximum communication speed of both experiments were 128 kbps and 400 kbps, respectively. In addition, the error vector magnitude of the equalized signals after the ATR-DFE processing were hardly degraded, compared with fewer transmission channel case.
  • Corresponding author: Mr Kida Yukihiro
    Affiliation: Japan Agency for Marine-Earth Science and Technology(JAMSTEC)
    Country: Japan
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