Seminar on Underwater Wireless Communication

Technical Student Seminar on Underwater Wireless Communication is a flourishing research field of wireless communications. Applications like oceanographic data collection, AUVs(autonomous underwater vehicles),underwater radio, transmission of video and audio signals by real time monitoring emphasized to overcome the present limitations.

Wireless is a used to describe the telecommunication with which the electromagnetic waves carry the signal over the communication path. The signals are not radio signals as electromagnetic waves propagate at a short distance so acoustic waves are used that propagate at a long distance. To overcome some impediments, here is an existence of underwater wireless communication. Necessity of underwater wireless system includes temporary experiments, breaking of wires, significant cost for deployment, and experiment over long distances.

Acoustic modems employ advanced modulation scheme and channel equalization to combat multiple paths to have improved signal to noise ratio. A high performance error detection and correction coding scheme is employed which reduces the bit error rate to less than 10-7. Parts of an acoustic modem are DSP board (Digital Signal Processing Board), AFE board (Analog Front End Board), and DC/DC converter.

Underwater networks consist of a number of sensors and vehicles which are deployed to do collaborative monitoring tasks on a given area. There is a traditional approach for ocean bottom monitoring is to deploy underwater sensors which record data and then recover the instruments. With this method, real time monitoring is not possible and failures happen. It can overcome by connecting underwater instruments with the help of wireless links.

Conclusion:

Beside development of the underwater wireless communication, there is an immense scope. Hence more research of the ocean bottom still remains unexploded. Therefore, the main objective about this emerging field is to overcome the present limitations such as the environmental effects on the noise performance of acoustic systems. It is highly affected by heterogeneities of the water column, variations of sound velocity versus depth, temperature and salinity, multiple and random sea reflections and significant scattering by fish, bubble clouds and plankton.

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