High-velocity based underwater acoustic (UWA) correspondence is difficult due to the limited transfer speed, broadened multipath spread, significant Doppler effect, and massive transmission incompatibility. The use of different transducers at both the transmitter and the collector increases the spatial variation of the framework, and further orthogonal frequency-division multiplexing (OFDM) addresses the issue of limited transmission capacity due to its high unearthly proficiency. As a result, the combination of different information from multiple-input multiple-output (MIMO) and OFDM tends to raise the UWA correspondence to an unprecedented level, while increasing the planning difficulties for the turn of events of such frameworks. The signal contains intersymbol impedance, intercarrier obstruction, and co-channel impedance as a result of the long multipath and Doppler shift, as well as various types of commotions caused by the boisterous acoustic channel. As a result, numerous channel assessment and adjustment plans for the UWA MIMO-OFDM correspondence frameworks are developed. This paper discusses and compares the time complexity and performance for channel and equalization schemes.