Abstract
Underwater communication has captured tremendous at tention in the last few years. The varied applicati ons ranging over commercial, scientific and military activities requ ire efficient communication under water. Acoustic w aves stand out as the best medium for communicating underwater. But underwater communication has to encounter effects of spreadin g loss, path loss, ambient noise, multipath propagation, Doppler effects etc. In this juncture, identifying suitable underwater a coustic channel model (UAC) is very important for minimum BER communication throug h underwater by considering water depth, frequency and range. Also the typical long delay spread and the resulting intersy mbol interference inherent in underwater acoustic c hannels has to be dealt with. Multicarrier modulation is a solution to this probl em. In this paper an analysis on the existing works related to underwater acoustic communication covering the channel modeling techniq ues and modulation schemes are presented and the be st technique is proposed.
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