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Delayed Frame Repetition for Free Space Optical communication (FSO) Channel

Shrestha, Amita and Giggenbach, Dirk and Hanik, Norbert (2017) Delayed Frame Repetition for Free Space Optical communication (FSO) Channel. In: ITG-Fachbericht, pp. 46-50. VDE VERLAG GMBH. ITG-Fachbericht 272: Photonische Netze, 11-12 May 2017, Leipzig, Germany. ISBN 978-3-8007-4427-5 ISSN 0932-6022

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Abstract

Free space optical communication is gaining interest because of its various advantages like high data rate, high power efficiency, no license regulation etc. However, one has to overcome the challenge of distortion and fading caused by atmospheric turbulences and bad weather conditions. Free space optical communication channel is a time variant channel. Sometimes, the channel has a very good condition and sometimes atmospheric condition gets very bad. Variable data rate is an efficient solution to cope with such situations. The system would run at maximum data rate in good conditions and can be adapted to work at lower data rate in worse situations. This paper discusses about one of the techniques to lower the data rate called Delayed Frame Repetition (DFR) for fading channels. It reduces the user data rate while maintaining the same channel data rate. The basic idea is to retransmit the data after a delay which is greater than fading length of the channel. Similar to spatial diversity systems, different combining techniques like Selective Combining (SC), Maximum-Ratio Combining (MRC) and Equal-Gain Combining (EGC) are studied. Numerous simulations are presented for MRC technique considering thermal limited PIN detector as a receiver, and for channel modelling artificially generated power vectors that are based on real measurements are used. Overall results show that DFR can be very useful for fading channel. MRC being the most efficient combining technique, it is used for evaluating the performance of DFR for different channel conditions with good, medium, bad scintillation indices, and different delays between retransmitted frames.

Item URL in elib:https://elib.dlr.de/112409/
Document Type:Conference or Workshop Item (Speech)
Title:Delayed Frame Repetition for Free Space Optical communication (FSO) Channel
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Shrestha, AmitaAmita.Shrestha (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Hanik, Norbertnorbert.hanik (at) tum.deUNSPECIFIED
Date:11 May 2017
Journal or Publication Title:ITG-Fachbericht
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 46-50
Publisher:VDE VERLAG GMBH
ISSN:0932-6022
ISBN:978-3-8007-4427-5
Status:Published
Keywords:KNOCGOP, FSO, Optical Communication, DFR, Delayed Frame Repetition, LEO Downlink, OLEODL, MRC
Event Title:ITG-Fachbericht 272: Photonische Netze
Event Location:Leipzig, Germany
Event Type:national Conference
Event Dates:11-12 May 2017
Organizer:Informationstechnische Gesellschaft in VDE (ITG), Fachausschuss 5.3 "Optische Nachrichtentechnik" und ITG-Fachgruppe 5.3.3 "Photonische Netze" mit freundlicher Unterstützung der Deutshen Telekom AG
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Technologien und Anwendungen, R - Projekt PROSIRIS
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Shrestha, Amita
Deposited On:02 Jun 2017 16:19
Last Modified:31 Jul 2019 20:09

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