Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma–gamma atmospheric turbulence channels

Abstract

Journal of Modern Optics (2013): Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma-gamma atmospheric turbulence channels, Journal of Modern Optics,The error performance was investigated of free-space optical (FSO) systems that use optical preamplifiers and diversity reception in turbulent atmosphere with gamma-gamma distribution. More specifically, assuming that the dominant sources of the receiver noises are the background light and amplifier spontaneous emission noises, we develop an exact bit-error-rate (BER) expression for binary pulse position modulation (BPPM) by a moment-generating function (MGF) derivative-based method. To gain more insight, we also derive a closed-form asymptotic BER expression for BPPM at high received optical power, by which we obtain the diversity and coding gains of the considered systems. Our analytical results lead to the observations that the attained diversity gain only changes with the gamma-gamma distribution parameters and the number of spatial modes collected by the receiver, while independent on the number of temporal modes passed by the optical preamplifiers. We verify the analytical results by Monte Carlo simulations.

Average BER performance of FSO SIM-QAM systems in the presence of atmospheric turbulence and pointing errors

“…Figure 6 also presents the exact and approximation average BER results for FSO system under the influence of only atmospheric turbulence. The exact results are obtained by Equations (13), (24) and (25), while approximation is performed based on Equation (26). Corresponding curves are in agreement with the case when the value of parameter ξ is very high (ξ = 4.01).…”

“…I a = I ax × I ay , where I ax and I ay arise from largescale and small-scale turbulent eddies, respectively, and both of them follow the Gamma distribution. The PDF for irradiance I a is then given by the so-called Gamma-Gamma PDF defined by [4,26,27]. The atmospheric path loss is described by the exponential Beers-Lambert law as I l = exp (−σ L), where σ denotes the atmospheric attenuation coefficient and L is the propagation distance [7].…”

Performance study of terrestrial multi-hop OFDM FSO communication systems with pointing errors over turbulence channels

“…Here, either the Gamma-Gamma or the Gamma distribution is used. The former has been proven that models accurately enough weak-to-strong turbulence conditions, while the latter provides a less complicated model and additionally, it has been demonstrated that is accurate enough, mainly for weak turbulence conditions, [3,9,12,15,19,23,26,27,[30][31][32][33]. It should be mentioned here that the Gamma distribution has been studied and gives very accurate results, especially, for satellites' optical up/downlinks under weak turbulence conditions, [26,27,33].…”

“…(3) P r (t) = P t (t)L tot I + n(t) [9,12,13,15,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Here, either the Gamma-Gamma or the Gamma distribution is used.…”

Exact error rate analysis of free-space optical communications with spatial diversity over Gamma–Gamma atmospheric turbulence

“…In [18,19], Belmonte and Kahn have studied the performance of diversity combining techniques applied to synchronous laser communication systems. In [20], Zhao et al have developed BER expressions for binary pulse position modulation by a moment-generating function derivative-based method for FSO multiple aperture receiving system with optical preamplifiers over Gamma-Gamma atmospheric distributions.…”