Improving Spectral Efficiency While Reducing PAPR Using Faster-Than-Nyquist Multicarrier Signaling

Cyrille Siclet (1) , Damien Roque (2) , Alexandre Marquet (1) , Laurent Ros (1)

1 GIPSA-CICS - GIPSA - Communication Information and Complex Systems
2 ISAE-SUPAERO - Institut Supérieur de l'Aéronautique et de l'Espace

Multicarrier modulations are widely used in mobile radio applications due to their adaptability to the time-frequency characteristics of the channel, thus enabling low-complexity equalization. However, their intrinsically high peak-to-average power ratio (PAPR) is a major drawback with regard to implementation issues (e.g., power amplification efficiency, regulatory constraints...). In this paper, we confirm that the PAPR can be decreased as the signal-ing density (i.e., spectral efficiency at fixed constellation size) increases, even in the case where symbols cannot be perfectly reconstructed using a linear system. In such a two-dimensional generalization of faster-than-Nyquist (FTN) systems, PAPR distribution models from the literature are confirmed by simulation results. Furthermore, for a fixed number of subcarriers, we show that a sufficient condition to yield the optimal PAPR distribution at the output of a critically sampled transmitter is to specify pulse shapes as tight frames. Finally, simulation are performed in the more realistic case of an oversampled transmitted signal.

Mots clés: Multicarrier modulations; power amplification; peak- to-average power ratio; faster-than-Nyquist signaling

Domaines: Traitement du signal et de l'image [eess.SP]

Cyrille Siclet, Damien Roque, Alexandre Marquet, Laurent Ros. Improving Spectral Efficiency While Reducing PAPR Using Faster-Than-Nyquist Multicarrier Signaling. International Workshop on Communication Technologies for Vehicles, May 2017, Toulouse, France. ⟨hal-01720656⟩