Summary
IEICE Information and Communication Technology Forum
2016
Session Number:A5
Session:
Number:A5-2
Optimal Combiners in Pre-Amplified Optical Wireless Systems: Operation under Strong Atmospheric Turbulence
Nikolaos Sagias, Anthony Boucouvalas, Konstantinos Yiannopoulos, Murat Uysal, Fary Ghassemlooy,
pp.-
Publication Date:2016-10-01
Online ISSN:2188-5079
Summary:
In this paper we analytically investigate optimal combiners in pre-amplified diversity receivers that operate under strong atmospheric turbulence. We first demonstrate that the combiner operation is strongly affected by the existence of a signal-dependent noise component, which manifests at the optical detector output as the outcome of the beating process between the amplifier spontaneous noise and the signal itself. Due to the signal-dependent nature of noise, the optimal combiner acts as a hybrid between the well-known equal gain and maximal ratio combiner architectures. Having established the optimal design, we then proceed to assess the proposed combiner performance in the negative-exponential fading environment and demonstrate that it achieves an additional link gain of several dB in comparison with selection and equal gain combiners.