Abstract
Underwater Acoustic Modem- Challenges, Technology and Applications - A Review Survey
Highlights
Over two third of earth’s surface is covered by water
Underwater acoustic communication can be termed as the process of sending and receiving
Since the acoustic channel is highly variable the underwater acoustic modem is preferred for reliable underwater communication
Summary
Over two third of earth’s surface is covered by water. There are many areas in ocean that are unexplored. The general classification on frequency of use, distance covered, speed of signal transmission, types of signal used, data rate etc. Various signals/ messages using ocean/sea as a medium. Electromagnetic waves are used for transmission in land and space communication, it cannot be used for underwater due to the properties of ocean. Low frequency modems are used predominantly as they provide long range communication at low channel bandwidth which further results in low data rate. The High frequency modem provides higher bandwidth and high data rate but high frequency signal are absorbed in the water, which limits the usage of high frequency signals.
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