首页|BER performance of nonzero dead time SPAD-based UWOC with signal accumulation over generalized gamma turbulence channels
BER performance of nonzero dead time SPAD-based UWOC with signal accumulation over generalized gamma turbulence channels
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NSTL
Elsevier
Underwater wireless optical communication (UWOC) becomes a hot topic in current researches. It suffers from severe absorption, scattering and turbulence, which result in a low reception power even in a short communication distance. To address this challenge, a single-photon avalanche diode (SPAD) based UWOC with signal accumulation method is proposed in this paper. Bit error rate (BER) performance of above method considering nonzero SPAD dead time over generalized gamma turbulence channels is investigated. For this goal, we first derive the expression for the instantaneous BER of above UWOC system. Then we obtain the optimal decision threshold corresponding to the minimum average BER. Based on those obtain expressions, we construct a useful closed form expression for the average BER corresponding to the minimum BER. With those expressions, the effects of the system parameters on the BER performance under turbulence channels are studied. The simulations show that a poor BER performance of 0.0094 for the system without using the signal accumulation under turbulence alpha(2) = 0.31 can be improved to 7.5 x 10(-7) by using 10 accumulation times, which indicates that the signal accumulation can overcome the adverse turbulence effect. Besides, we also find that even with quiet low receive power of 1 photon/bit, the UWOC system can still obtain a good BER performance of smaller than 10(-6).
NSTL
Elsevier
