PERFORMANCE EVALUATION OF UNDERWATER ACOUSTIC COMMUNICATION USING TRIGONOMETRIC CHIRP MODULATION

In this paper, we propose an underwater acoustic communication based on trigonometric chirp modulated waveforms. We show that a usual system with linear chirp modulation requires wide bandwidth. Therefore, a Doppler resilient and robust underwater digital communication system based on a non-linear frequency modulation as trigonometric chirp technique has been presented. To evaluate the performance of trigonometric chirp modulation technique over AWGN channel, Rayleigh fading and Rician channels with and without Doppler effect, we have conducted some simulations. It is demonstrated that the performance of proposed method, even in lower spreading factors gives better performance than an LFM chirp modulated system in terms of bit error rate.