Estimating the Performance of Free Space Optical Communication in Rain Weather Conditions Using Various Models and Modif
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SCIENTIFIC RESEARCH PAPER
Estimating the Performance of Free Space Optical Communication in Rain Weather Conditions Using Various Models and Modified Duobinary Return to Zero Technique S. Magidi1
•
T. Pondani1
Received: 10 December 2019 / Revised: 24 August 2020 / Accepted: 10 September 2020 The National Academy of Sciences, India 2020
Abstract Free space optical communication (FSO) system has remarkably gained importance of late due to the various advantages associated with it. However, before deployment of FSO communication system, an understanding of the laser beam scintillation due to the atmospheric as well as other weather-induced losses need to be understood. This paper mainly focuses on simulative performance analysis of an FSO system under rain conditions using Optisystems commercial software and rainfall data. Thus, the available models which are the Suriza, Carbonnea, Japan and Samir models were used to determine the rainfall-induced attenuation for a given rainfall rate. Unlike in the previous articles that only used on off keying as the modulation scheme at the transmitter, we have used modified duobinary return to zero (MDRZ) modulation. Further, to improve the MDRZ-based FSO performance in rain conditions, we have used the single-input multiple-output (SIMO) concept with equal gain combining (EGC) at the receiver and again proved that the improvement in BER, Q factor and received optical power suggests that MDRZbased SIMO FSO communication results in a remarkable improvement. Keywords FSO Single-input single-output MDRZ Rainfall rate BER Q factor
& S. Magidi [email protected] 1
Department of Electronic Engineering, Harare Institute of Technology, Box BE 277, Belvedere, Harare, Zimbabwe
1 Introduction In recent years, free space optical (FSO) communication has proved to be an important communication technique in terrestrial as well as outer space links. Being a line of sight communication link [1], the basic operational principle involves transmitting a data laden laser beam into unguided media, or free space; hence, it has been known alternatively as optical wireless communication or fiber optic communication without the fiber [2]. FSO carries large data compared to fiber optic cables, is less expensive to lay down as well as saving time and is not licensed by governments, Therefore, target areas of applications include last mile access, cellular back haul, inter and intra-chip links [3], earth to satellite full duplex communication as well as temporary communication links for applications such as sports or disaster recovery among others [4]. FSO systems suffer from the prevailing adverse weather conditions and atmospheric turbulence [5]. Weather-induced loses is mainly attributed to rain attenuation, which causes laser beam scattering when it passes through bigsized raindrops. Studies are available in the literature to estimate the FSO loss due to rainfall, using various models. Although most of these models were for predicting radio wave propagation, few prediction models have b
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