Underwater Ad Hoc Wireless Communication for Video Delivery

Due to the high attenuation of the water at high frequencies, underwater communications in freshwater are not being investigated so much. Many current underwater communication systems are based on acoustic or optical techniques. The use of electromagnetic (EM) waves in this medium, even in short distances, increases the bandwidth, which definitely implies a great advantage for video delivery. Related literature shows that the speed propagation and absorption coefficient in freshwater are independent of the working frequency of the transmitted signals. No work shows any temperature dependence with the electromagnetic waves propagation. In this paper, we study the EM wave's behavior when we vary the temperature at 2.4 GHz in underwater freshwater environments. We are going to study the signal behavior in this medium in order to deliver video images from the marine fish cages with the purpose of monitoring the fish activity. To carry out our study, we fix the water conditions and measure the maximum distance as a function of several network parameters such as the working frequency, data transfer rate, modulations and water temperature. Our results show that some combinations of temperature and working frequency generate better results than others. Finally, we will compare our results with the statements extracted from other works.