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Real-time Iterative Pre-distortion in Commercial DVBS2X Satellite Modulator

Philippe Potier and Christophe Lavallée
IRT Saint-Exupéry/Embedded systems, Toulouse, France
Abstract—In order to meet the ever-increasing demand for satellite throughput, high efficiency amplitude and phase shift keying (APSK) modulation orders have been introduced in the latest revision of the DVBS2X standard, posted in 2015, along with tighter roll-off factors of 0.05 and 0.1, leading to an increase of about 15% in achievable spectral efficiency in the AWGN channel. Nevertheless, nonlinear distortions caused by the on-board high power amplifier (HPA), especially when driven close to saturation, as well as linear distortions induced by the payload channelizing filters (IMUX, OMUX), unravel these benefits unless mitigated. In this context, our institute have developed a powerful pre-distortion technique, based on the so-called small variation algorithm (SVA). Following intensive software simulation campaigns, a proof of concept demonstration was completed using in-house FPGA-based hardware pre-distortion mock-up, confirming that achievable spectral efficiency can be increased by up to 11% thanks to the SVA mitigation technique.
 
Index Terms—SVA iterative pre-distortion, DVB-S2X, achievable spectral efficiency, model based FPGA prototyping

Cite: Philippe Potier and Christophe Lavallée, “Real-time Iterative Pre-distortion in Commercial DVBS2X Satellite Modulator,”Journal of Communications vol. 15, no. 2, pp. 115-121, February 2020. Doi: 10.12720/jcm.15.2.115-121
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