Performance Analysis of Both Shot- and Thermal-Noise Limited MultiPulse PPM Receivers in Gamma–Gamma Atmospheric Channels

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 shotand thermal-noise limited scenarios are considered. For the shotnoise 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.

Optimized FSO System Performance over Atmospheric Turbulence Channels with Pointing Error and Weather Conditions

“…Building sway causes misalignment (pointing error) between the transmitter and the receiver, therefore less optical power will be collected by the receiver which degrades the performance the FSO system. Many authors have investigated the performance of FSO systems using different statistical models [4][5][6][7][8][9][10][11][12][13][14][15][16] to describe the channel randomness and its effect on the received signal. It was shown by [9], that the double-Weibull probability density function (pdf) is an appropriate model to describe the signal irradiance under medium to strong turbulence channel strengths.…”

“…It was shown by [11], that the gamma-gamma pdf is an appropriate and accurate channel model to describe the signal irradiance for weak to strong turbulence conditions. This pdf was then used and adopted by many authors [5][6][7], [12], [13], to evaluate the FSO system metrics performance for weak to strong turbulence conditions. This work was motivated by the ability of wireless FSO technology to provide high speed data rate for current and future wireless applications such as 4G/5G networks, medical technology, cloud computing and sensor networks.…”

SER performance analysis of MPPM FSO system with three decision thresholds over exponentiated Weibull fading channels

“…Furthermore, the performance of FSO communication system with MPPM technique was investigated under GG distribution considering receiver noise. The analysis of shot noise was based on the method of photon counting [21]. However, there are no published works on the error performance of MPPM based FSO systems over the EW fading channels up to now, to the best of our knowledge.…”

Effect of timing jitter on the BER performance of a M-PPM FSO link over atmospheric turbulence channel

“…Numerous woks on optical M-ary pulse position modulation (M-PPM) are also carried out to investigate the effectiveness of M-PPM in FSO links as M-PPM is an energy efficient modulation format compared to on-off keying (OOK) and other modulation schemes [6][7][8][9][10]. The effects of atmospheric turbulence and pointing error on the bit error rate performance of a PPM FSO link is reported in [6].…”