| Summary |
This paper investigates underwater optical wireless communication (UOWC) systems. We introduce a system model including the main factors impairing the optical signal intensity, i.e., light absorption, scattering, together with water turbulence, which have not been thoroughly investigated in other UOWC studies. The optimal receiver design is based on maximum a posteriori (MAP) estimation while considering not only thermal noise but also shot noise. In addition to the MAP-based receiver, a simplified configuration of the receiver is also examined. The symbol error rate (SER) is analytically calculated for 3 different modulation schemes, i.e., pulse-position modulation (PPM), pulse-amplitude modulation (PAM), and pulse-amplitude-and-position modulation (PAPM). The obtained results show that a SER of 0.001 is achieved at a distance of 20 m for all the modulation schemes. The superiority of PPM over PAM and PAPM in terms of the SER is also shown. We demonstrate that the simplified receiver obtains almost the same SER performance as the MAP receiver. |
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