Accessibility statement

Self-Interference Cancellation for Full-Duplex Underwater Acoustic Systems

Underwater acoustic (UWA) communication suffers from the limited available bandwidth for data transmission. To maximise the capacity of the acoustic links, we consider full-duplex (FD) communications, where a transceiver simultaneously transmits and receives data in the same frequency band.  The main obstacle of achieving FD communication is the strong self-interference (SI) introduced by the near-end transmission. In some communication scenarios, the SI can be 100 dB higher than the receiver noise floor. The residual SI will reduce the signal to noise ratio (SNR) of the far-end desired signal and thus degrade the system performance.

For FD UWA communications, the low signal frequencies allow high-resolution analogue-to-digital converters to be used. Therefore, we aim to achieve higher digital SI cancellation performance compared to terrestrial radio systems. The digital canceller we use is based on the low-complexity RLS-DCD adaptive filter which was developed in York. The experimental results from the indoor water tank indicate that the proposed digital canceller can achieve as high as 69 dB SI cancellation. The experimental setup is shown in the adjacent figure. Transmit and/or receiver beamforming are also considered to deal with the time-variation introduced by the moving sea surface and to achieve additional SI cancellation. We are now investigating the performance of different cancellation schemes in both water tank and lake experiments. 

Members

  • Lu Shen
  • Yuriy Zakharov

Funding

  • Scholarship from the Department of Electronic Engineering

Dates

  • Oct 2017 – Sep 2020

Research