Passive time reversal based hybrid time-frequency domain equalizer for underwater acoustic communication

For recent years the passive time reversal process is one of the hotspots research in underwater communications. It has the property of space-time focusing, which has been used in single carrier time domain equalization (SC-TDE) system. Single carrier block transmission adopting frequency domain equalization processing, which has the advantages of low complexity. In order to improve the performance further, this paper presents a method of passive time reversal (TR) based hybrid time-frequency domain equalizer (TR-HTF) for underwater acoustic communication, two structures of TR-HTF is established. This method can effectively reduce tap order of time domain equalizer by using frequency domain equalizer in advance. Theoretical analysis and simulation studies have confirmed the validity of the proposed method.