Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities

Jean-Alain Lucciardi (1) , Nathalie Thomas (2, 3) , Marie-Laure Boucheret (2, 3) , Charly Poulliat (2, 3) , Gilles Mesnager (1)

1 IRT Saint Exupéry - Institut de Recherche Technologique
2 IRIT-SC - Signal et Communications
3 Toulouse INP - Institut National Polytechnique (Toulouse)

Faster-than-Nyquist (FTN) signaling appears as an attractive method to improve spectral efficiency at the price of an increased complexity at the receiver. The receiver generally implements a turbo-equalization/detection scheme to benefit from all the promises of the FTN signaling. However, this is not the only limitation we have to deal with. Indeed, compressing in the time domain impact the emitted signal and it usually results in an increase of the envelope fluctuations. This leads to an inherent multi-objectives trade-off between performance, targeted spectral efficiency and limited Peak to Average Power Ratio (PAPR). The last aspect is crucial when considering a satellite communication link due to non-linear amplification effects that can occur on-board the satellite. Usually, FTN studies focus on spectral efficiency increase for a fixed modulation order, trying to trade-off between performance and PAPR properties. In this paper, we show that, for a given asymptotic spectral efficiency, we can compress low order modulations to increase the spectral efficiency of these schemes while controlling the PAPR increase to achieve a better PAPR than the non compressed scheme with a higher modulation order. Thus, for the same asymptotic spectral efficiency, we can achieve 1 dB gain in terms of PAPR and 2 dB gain in Bit Error Rate (BER) performances for a coded 8-PSK FTN system compared to a coded 16-APSK. For the same BER performances, the asymptotic spectral efficiency gain obtained in linear context is over 20 %, higher when non-linearities are taken into account.

Mots clés: Mathematical model; Receivers; Modulation; Peak to average power ratio; Satellites; Bit error rate; Linearity

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]; Traitement du signal et de l'image [eess.SP]; Traitement des images [eess.IV]; Vision par ordinateur et reconnaissance de formes [cs.CV]; Intelligence artificielle [cs.AI]; Modélisation et simulation; Electronique

Jean-Alain Lucciardi, Nathalie Thomas, Marie-Laure Boucheret, Charly Poulliat, Gilles Mesnager. Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities. IEEE International Conference on Communications (ICC 2016), May 2016, Kuala Lumpur, Malaysia. pp. 1-7. ⟨hal-01461699⟩