Circular Faster-Than-Nyquist Signaling for High Spectral Efficiencies: Optimized EP-Based Receivers
| Autor: | Pascal Chevalier, Sylvain Traverso, Guillaume Ferre, Titouan Petitpied, Romain Tajan |
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| Přispěvatelé: | Laboratoire de l'intégration, du matériau au système (IMS), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université Sciences et Technologies - Bordeaux 1, CEDRIC. Traitement du signal et architectures électroniques (CEDRIC - LAETITIA), Centre d'études et de recherche en informatique et communications (CEDRIC), Ecole Nationale Supérieure d'Informatique pour l'Industrie et l'Entreprise (ENSIIE)-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Ecole Nationale Supérieure d'Informatique pour l'Industrie et l'Entreprise (ENSIIE)-Conservatoire National des Arts et Métiers [CNAM] (CNAM) |
| Rok vydání: | 2021 |
| Předmět: |
Computer science
Gaussian Equalization (audio) Spectral efficiency Cyclic prefix Intersymbol interference symbols.namesake Signal-to-noise ratio Expectation propagation symbols Nyquist–Shannon sampling theorem Electrical and Electronic Engineering [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing Algorithm Computer Science::Information Theory |
| Zdroj: | IEEE Transactions on Communications IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2021, 69 (8), pp.5487-5501. ⟨10.1109/TCOMM.2021.3078563⟩ |
| ISSN: | 1558-0857 0090-6778 |
| Popis: | International audience; This paper proposes unprecedented Expectation Propagation (EP)-based receivers for Circular Faster-Than-Nyquist (CFTN) signaling. This concept yields a Minimum Mean-Square-Error equalizer for InterSymbol Interference (ISI) processing combined with a block which we call Constellation Matcher in charge of the symbol estimates realignment with the constellation. From this framework, we explore different scheduling strategies leading to iterative EP-based receivers with our without decision feedback. Then, by extending the family of the EP process to a subset of non-circular Gaussian distributions results in a Widely Linear (WL) equalization. This new WL-EP receiver best fits the CFTN model, allowing enhanced performance at the cost of a slightly increased complexity. Also, we propose to restrict the Gaussian family to circular Gaussian distributions with identity covariance matrices up to a scaling factor. Combined with CFTN, this particular family allows a low-complexity Frequency-Domain processing of the equalization without requiring any cyclic prefix. The proposed EP-based receivers for CFTN are then evaluated for different spectral efficiencies and computational complexities. Our simulations show that they completely handle the ISI up to 5 bits/s/Hz and double the spectral efficiency compared to Nyquist signaling with almost no performance loss. |
| Databáze: | OpenAIRE |
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