Performance evaluation of joint passive time reversal and adaptive decision feedback equalizer in shallow water environment

Underwater wireless communication is growing rapidly along with human needs for applications such as defense, state security, underwater control, and monitoring system. The underwater acoustic channel has many challenges such as selectivity time-space, frequency dependent noise, Doppler shift, and intersymbol interference on transmission. Time Reversal is an effective method for dealing with inter-symbol interference. In TR a signal is precoded in such a way that it focuses both in time and in space at a particular receiver. This paper evaluates the performance of joint Passive Time Reversal and Adaptive Decision Feedback Equalizer (PTR-ADFE) technique in shallow water environment. Geometry-based channel model and environmental parameters are used. In addition, the modification of the LMS algorithm at Decision Feedback Equalizer is done to improve the performance of the PTR-ADFE communication system. The simulation results show that the Bit-Error-Rate (BER) of PTR-ADFE increases significantly when compared to the BER value of equalization technique.