Self-Interference cancellation in underwater cooperative communication based on time reverse

Recently, with the development of Marine exploration, the need for high speed underwater communication is growing rapidly. However, information transmission rate is low, because of the limited bandwidth caused by high attenuation for high frequency acoustic signal and great noise in low frequency band. To this end, a self-interference cancellation algorithm in underwater cooperative communication is proposed. In this underwater cooperative communication system, underwater nodes could transmit to each other through underwater base station at the same time. Moreover, common uplink frequency and downlink frequency are adopted to reuse the frequency spectrum and improve the transmission efficiency. In this algorithm, active time reverse is adopted to mitigate the multipath effect in underwater acoustic transmission and then take advantage of the known characteristic of self-information, the self-interference could be cancelled. Simulation results show that, the bit error ratio performance is similar to existing time division cooperative communication, and may double the transmission rate.