In acoustic channel it is known that low available bandwidth, highly varying multipath, large propagation delays, noise and physical channel properties variation, in addition to the power consumption restrict the efficiency of underwater wireless acoustic systems. The physical characteristics of Mediterranean channel such as depth, salinity and especially temperature influence the acoustic signal attenuation, the SNR level, error ratio and the signal bandwidth. It seems to be crucial to introduce these parameters in the underwater channel model of the underwater wireless communication network. The goal of this paper is to highlight the impact of the temperature variation at shallow sea on the acoustic signal attenuation and error ratio and explain the relationship between temperature and SNR as well as the optimal frequency of the transmitted signal.
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