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The underwater channel poses numerous challenges for acoustic communication. In the open ocean, these channels are significantly dynamic due to many aspects such as transmitter receiver movement, variable ambient noise, transmission loss, attenuation, time varying sound speed profiles and boundary reflections.. Hence the acoustic waves transmitted in water suffer long propagation delay, fading, multipath, limited bandwidth, and high spatial and temporal variability. This paper presents the work on channel characterization from the data measured in a shallow water experiment conducted off Chennai coast during January 2018. Linear Frequency Modulated pulse of different pulse width with the center frequency of 11 kHz and bandwidth of 4 kHz was used as a probe signal to estimate the channel impulse response. From the channel impulse response, channel’s scattering function and other characterization functions such as multipath intensity profile, frequency correlation function, time correlation function and Doppler power spectrum are estimated. These characterization functions estimate the delay spread as well as the severity of the fading in the communication channel.
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