Abstract
The aim of this paper is to show the problems of implementing the wireless adaptive networks with the free space optical (FSO) technology. Implementing adaptive networks with the wireless optical communication technology has several benefits and also some hindering problems. The thermal optical noise modeled with Gaussian distribution and link turbulence is two of the major problems of this implementation. In this paper, the theoretical analysis of the FSO link effects that are modeled with K-distribution and Negative exponential distributions are considered on the estimation performance of the adaptive incremental networks. These distributions arise when the FSO link is contaminated with strong optical turbulence. Experiments are designed to cover these conditions and the analysis is based on the steady state mean square deviation (MSD) and excess mean square error (EMSE) values for the incremental LMS (ILMS) algorithm and these are the metrics that show how well the adaptive network performs. Simulation results are presented for different parameters of $K$ -distribution and negative exponential distribution and the results show perfect match with the theoretical outcomes. Based on these results, we show that implementing the incremental adaptive networks in the strong turbulence conditions is not feasible and we must think of some countermeasures for these cases.
Highlights
Adaptive filters and adaptive networks can be used to estimate system transfer parameters in many applications such as wireless communications [1]–[10] and radar systems [11]–[19]
Our aim is to see how severely the free space optical (FSO) links with very strong turbulence levels affect the performance of adaptive networks
This paper aims to show the problems of implementing the wireless adaptive networks with the FSO technology
Summary
Adaptive filters and adaptive networks can be used to estimate system transfer parameters in many applications such as wireless communications [1]–[10] and radar systems [11]–[19]. In this case, free space optical (FSO) communication technology is suitable for many tasks [19]–[24]. The implementation of adaptive networks with FSO technology is highly desirable because the application of these systems can be environmental surveillance and target tracking that are mainly military applications. The optical turbulence is caused by the varying refractive index of the environmental void between the optical transmitter and receiver that is caused by environmental interferences such as rain, fog and pollution
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