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Ultra-high-speed data relay systems

Barrios, Ricardo and Matuz, Balazs and Mata-Calvo, Ramon (2018) Ultra-high-speed data relay systems. In: Satellite Communications in the 5G Era IET TELECOMMUNICATIONS SERIES, 79. The Institution of Engineering and Technology. pp. 341-373. ISBN 978-1-78561-427-9.

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Official URL: https://www.theiet.org/resources/books/telecom/sat-com-5g.cfm


The SpaceDataHighway, the first operational service of high-speed data relay system based on optical inter-satellite links, has set a new milestone in space optical communications. Data relay systems are becoming crucial in applications such as Earth observation, where huge amounts of data need to be sent to Earth reliably and with low latency. Optical communications plays a major role in such high-speed applications, since no-regulations are needed, because the lack of interference among users, and the huge amount of available bandwidth. Since the end of the 1990’s, several experiments have shown the feasibility of such technology with several demonstrations from LEO, GEO and the Moon. The current state-of-the-art relay system architecture involves LEO and GEO satellites with optical inter-satellite links, and direct Ka-Band RF links from GEO to the Earth. Next generation systems may involve also UAVs, and may rely only on optical communications to exploit the full potential of these frequencies. The main challenges of using optical links are the turbulence effects, when the link traverses the Earth’s atmosphere, and the degrading impact of platform micro-vibrations because of the inherently small divergence of the transmitted beam. Such aspects have to be taken into account when designing future systems. Together with the modulation, the forward error correction (FEC) defines the communications performance of the system. Following CCSDS coding recommen-dations, the performance of several coding schemes is analyzed; concretely Reed-Solomon codes, convolutional codes, turbo codes and low-density parity check codes are taken into account. One of the main characteristics of the atmospheric channel is the correlation of fading events, which requires further data protection to compensate for erasure events. Interleaving and packet level coding in combination with FEC are compared through simulations. Finally, different approaches for data correction are considered. The complexity on board the GEO satellite can specially limit the use of the most advanced decoding schemes and data-protection for the upcoming generations of relay systems. The trade-off between performance and complexity is crucial in order to allow further system enhancements in terms of capacity, without endangering the whole system availability.

Item URL in elib:https://elib.dlr.de/121069/
Document Type:Book Section
Title:Ultra-high-speed data relay systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Barrios, RicardoRicardo.Barrios (at) dlr.dehttps://orcid.org/0000-0002-2545-5568
Matuz, Balazsbalazs.matuz (at) dlr.deUNSPECIFIED
Mata-Calvo, Ramonramon.matacalvo (at) dlr.deUNSPECIFIED
Journal or Publication Title:Satellite Communications in the 5G Era
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 341-373
EditorsEmailEditor's ORCID iD
Publisher:The Institution of Engineering and Technology
Keywords:Data Relay Systems High-Speed Optical Communications Forward Error Correction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben EDRS (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Barrios, Dr. Ricardo
Deposited On:20 Jul 2018 14:20
Last Modified:31 Jul 2019 20:18

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