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Optimal combiners in pre-amplified optical wireless systems under medium-to-strong atmospheric turbulence

Sagias N. A., Boucouvalas A. C., Yiannapoulos K., Uysal M., Ghassemlooy Z.

Image Processing & Communications

2016

Vol. 21, no. 1

23--32

In this work we analytically investigate optimal combiners for pre-ampliﬁed diversity receivers that operate under medium-tostrongatmosphericturbulence. We ﬁrst demonstrate that the combi ner performance is strongly affected by the existence of a signal-ampliﬁed spontaneous emission beat noise at the output of the photodetector. Due to the Signac dependent nature of noise, the optimal combi ner can be classiﬁed as a hybridone,of which performance is between the well-known equalgain and maximal-ratio combiner architectures. Having established the optimal design, we further assess the proposed combiner performance over gamma-gamma and negative-exponential fading environments.