A Survey Report on Underwater Acoustic Channel Estimation of MIMO-OFDM System

Underwater acoustic (UWA) channels are highly challenging in nature and from the past few decades, many researchers are investigating the efficient way of UWA channel estimation. Different approaches have been taken for UWA channel estimation like OFDM, Compressed Sensing, etc. In this paper, a survey is presented on various estimation techniques involved in the UWA channel. Work is presented in three different parts. The first part presents different challenges in the UWA channel. In the second part, works on MIMO-OFDM-based UWA channels are presented. In the last part, a survey on compressed sensing based channel estimation of the UWA-MIMO-OFDM system is presented. A performance comparison is given on the different channel estimation algorithms.