Analyzing Multipath Fading in Deep Water Through Signal to Noise Ratio

Exploring the forefront of technological progress, underwater acoustic communication presents a distinctive and intricate challenge for researchers and engineers. In contrast to terrestrial settings, the underwater domain introduces a dynamic and complex acoustic medium, significantly affecting signal transmission. The imperative to establish dependable communication links beneath the waves has intensified due to applications spanning marine exploration, surveillance, and offshore communication. The underwater environment poses unique challenges, including multipath propagation, signal attenuation, and fluctuating ambient noise levels. These challenges arise from the behaviour of sound waves in water, where they exhibit diverse speeds, refraction, and surface reflection. This study delves into the complexities of multipath acoustic propagation in deep water environments, drawing on insights from the signal-to-noise ratio (SNR) characteristics. The investigation scrutinizes the impact of transmission losses and various ambient noise models on the SNR of received signals, considering underwater environmental parameters such as temperature, salinity, pH, and depth variations in deep water. Furthermore, the research explores how frequency influences ambient noise models, adding depth to our understanding of the intricate interplay between underwater acoustic communication and environmental factors. It is clearly depicted from simulation results, at higher frequencies, the SNR is almost same irrespective of ambient noise parameters, But the SNR showing abrupt changes at the middle frequencies (400 to 800 Khz), due to sound speed variations.