KIT | KIT-Bibliothek | Impressum | Datenschutz

End-to-end Optimization of Constellation Shaping for Wiener Phase Noise Channels with a Differentiable Blind Phase Search

Rode, Andrej 1; Geiger, Benedikt 1; Chimmalgi, Shrinivas 1; Schmalen, Laurent 1
1 Communications Engineering Lab (CEL), Karlsruher Institut für Technologie (KIT)

Abstract:

As the demand for higher data throughput in coherent optical communication systems increases, we need to find ways to increase capacity in existing and future optical communication links. To address the demand for higher spectral efficiencies, we apply end-to-end optimization for joint geometric and probabilistic constellation shaping in the presence of Wiener phase noise and carrier phase estimation. Our approach follows state-of-the-art bitwise auto-encoders, which require a differentiable implementation of all operations between transmitter and receiver, including the DSP algorithms. In this work, we show how to modify the ubiquitous blind phase search (BPS) algorithm, a popular carrier phase estimation algorithm, to make it differentiable and include it in the end-to-end constellation shaping. By leveraging joint geometric and probabilistic constellation shaping, we are able to obtain a robust and pilot-free modulation scheme improving the performance of 64-ary communication systems by at least 0.1 bit/symbol compared to square QAM constellations with neural demappers and by 0.05 bit/symbol compared to previously presented approaches applying only geometric constellation shaping.


Verlagsausgabe §
DOI: 10.5445/IR/1000158490
Veröffentlicht am 10.05.2023
Originalveröffentlichung
DOI: 10.1109/JLT.2023.3265308
Scopus
Zitationen: 15
Web of Science
Zitationen: 5
Dimensions
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Communications Engineering Lab (CEL)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0733-8724, 1558-2213
KITopen-ID: 1000158490
Erschienen in Journal of Lightwave Technology
Verlag Optica Publishing Group (OSA)
Band 41
Heft 12
Seiten 3849 - 3859
Nachgewiesen in Web of Science
Dimensions
Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page