Abstract
The performance of free-space optical (FSO) communication systems adopting multipulse PPM (MPPM)
techniques is investigated taking into account the effects of both the atmospheric turbulence and receiver noise. The
atmospheric turbulence is modeled by a gamma–gamma distribution, which is suitable for both weak and strong
turbulence. As for the receiver noise, both shot- and thermal-noise limited scenarios are considered. For the
shot-noise limited system, both exact and approximate expressions of the average symbol-error rate (SER) of the system
are obtained. For the thermal-noise limited system, a closed form for the upper bound of the average system SER, based
on the Meijer G function, is obtained. Then, we validate it using Monte Carlo simulation results. Furthermore, we
study the effects of changing the atmospheric conditions, operational wavelengths, and number of time slots on the
average system performance. In addition, we compare the performance of the aforementioned system with that of the
traditional PPM technique, in a gamma–gamma channel, under same constraints on the average energy per bit,
transmission data rate, and bandwidth.
© 2013 IEEE
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