| Summary |
Underwater optical wireless communications (UW-OWC) are considered as a promising solution that can ensure high data rate and low delay transmission, surpassing the acoustic systems. In this paper, we present a UW-OWC system employing one-to-one transmission in the presence of a turbulent channel. In such a challenging environment, the intensity of the transmitted signal is severely affected by turbulence, and light absorption, and scattering. Thus, we propose a comprehensive system model taking into consideration the channel characteristics as well as the main noises that impair the received signal, i.e., the shot noise, and the thermal noise. In our model, we use several intensity modulation schemes: pulse-amplitude modulation (PAM), pulse-position modulation (PPM), and pulse-amplitude-and-position modulation (PAPM). The system performance is evaluated by numerical analysis. Our results show that the deterioration of the transmission quality due to the increase in the number of amplitude level was smaller in PPM compared to PAM and PAPM. |
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