Federated learning (FL) has recently emerged as a distributed machine paradigm for systems with limited and intermittent connectivity. This paper presents the new context brought to FL by satellite constellations, where connectivity patterns are significantly different from ones observed in conventional terrestrial FL. The focus is on large constellations low Earth orbit (LEO), each satellites ...

In this paper we show that the problem of designing eÆcient multiple-antenna signal constellations for fading channels can be related to the problem of nding packings with large minimum distance in the complex Grassmannian space. We describe a numerical optimization procedure for nding good packings in the complex Grassmannian space and report the best signal constellations found by this proced...

This paper introduces a novel blind carrier phase recovery estimator for general 2π/M-rotationally symmetric constellations. This estimation method is a generalization of the non-data-aided (NDA) nonlinear Phase Metric Method (PMM) estimator already designed for general quadrature amplitude constellations. This unbiased estimator is seen here as a fourth order PMM then generalized to M th order...