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

Abstract : 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.
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Submitted on : Thursday, March 1, 2018 - 2:32:57 PM
Last modification on : Wednesday, November 3, 2021 - 5:12:14 AM
Long-term archiving on: : Wednesday, May 30, 2018 - 1:44:20 PM

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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⟩

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