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Physical Layer Forward Error Correction for Free-Space Optical Links

Griebel, Oliver und Sauter, Alexander Michael und Wasenmüller, Uwe und Steiner, Lukas und Poliak, Juraj und Matuz, Balazs (2024) Physical Layer Forward Error Correction for Free-Space Optical Links. In: Free-Space Laser Communications XXXVI 2024. SPIE Photonics West 2024, Free-Space Laser Communications XXXVI, 2024-01-27 - 2024-02-01, San Francisco, United States. doi: 10.1117/12.3001394. ISBN 978-151067014-3. ISSN 0277-786X.

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Kurzfassung

We consider high data rate free-space optical links between satellite and ground station, which are prone to strong variations of the received signal due to atmospheric turbulence. The high data rates towards hundreds of Gbit/s paired with channel coherence times of a few milliseconds pose a serious challenge for reliable transmission. On such non-ergodic channels, the use of appropriate diversity techniques combined with channel coding schemes is a must to ensure the required data rates. There are several ways to tackle the problem. A pragmatic approach is to rely on commercial transceivers from fiber optics, which are, however, not tailored to the free-space optical channel. Code rates are high and no suitable diversity schemes are foreseen. Such transceivers can be combined with a suitable retransmission scheme, which strongly reduces spectral efficiency. Another option is the addition of a complementary erasure coding scheme at a higher layer, which, due to its long codewords and additional redundancy, can correct longer sequences of errors. However, such a layered scheme yields a loss in achievable data rates. In this work, we rely on a theoretically optimal approach which is composed of a long physical layer interleaver as well as a long physical layer channel code. While the interleaver should provide the required time diversity, the selected strongly quantized low-density parity-check (LDPC) code should correct the errors in the data. To support the required data rates, highly optimized hardware implementation becomes mandatory for both interleaver and decoder. To achieve high error correction performance and data rates towards hundreds of Gbit/s, a cross-layer design methodology is mandatory in which interleaver design, code, and decoding algorithms are jointly considered with its hardware implementation. We show that an application-specific integrated circuit (ASIC) implementation can reach the target data rates with a moderate backoff from theoretical limits.

elib-URL des Eintrags:https://elib.dlr.de/203318/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Physical Layer Forward Error Correction for Free-Space Optical Links
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Griebel, Oliveroliver.griebel (at) rptu.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sauter, Alexander Michaelalexander.sauter (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wasenmüller, Uweuwe.wasenmueller (at) rptu.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Steiner, Lukaslukas.steiner (at) rptu.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Poliak, JurajJuraj.Poliak (at) dlr.dehttps://orcid.org/0000-0002-6599-3117157032859
Matuz, Balazsbalazs.matuz (at) dlr.dehttps://orcid.org/0000-0002-0133-6564NICHT SPEZIFIZIERT
Datum:Januar 2024
Erschienen in:Free-Space Laser Communications XXXVI 2024
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1117/12.3001394
ISSN:0277-786X
ISBN:978-151067014-3
Status:veröffentlicht
Stichwörter:FEC, FSO links, LDPC code, ASIC, beyond 100 Gbit/s, Interleaving, SIHO decoder
Veranstaltungstitel:SPIE Photonics West 2024, Free-Space Laser Communications XXXVI
Veranstaltungsort:San Francisco, United States
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:27 Januar 2024
Veranstaltungsende:1 Februar 2024
Veranstalter :SPIE Photonics West
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Kommunikation, Navigation, Quantentechnologien
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R KNQ - Kommunikation, Navigation, Quantentechnologie
DLR - Teilgebiet (Projekt, Vorhaben):R - Global Connectivity for People and Machines
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Satellitennetze
Institut für Kommunikation und Navigation > Optische Satellitenlinks
Hinterlegt von: Sauter, Alexander Michael
Hinterlegt am:05 Apr 2024 12:55
Letzte Änderung:31 Okt 2024 10:56

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