Abstract
Time reversal is an effective method of channel equalization for underwater acoustic communication. Its temporal and spatial focusing effect collects long time spread signals due to a rich multipath environment inherent in underwater acoustics. Additionally, it is easy to compensate Doppler frequency shift after time reversal focusing. Recently, demands for multiuser or multiple-input-multiple-output (MIMO) communication have increased widely for multiple autonomous underwater vehicles (AUVs) or high rate underwater acoustic network communication. Similarly, in Japan Agency Marine-Earth Science and Technology (JAMSTEC), a plan of multiple AUVs operation is being progressed. Time reversal is a promising solution also for such multiuser or MIMO communication by realizing space division multiplexing (SDM) based on its spatial focusing and nulling effect without sacrificing data transmission rate. In this study, the performance of time reversal is analyzed with simulation or real data comparing with orthogona...
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