  The field of satellite communications is enjoying a renewed interest in the
global telecom market, and very high throughput satellites (V/HTS), with their
multiple spot-beams, are key for delivering the future rate demands. In this
article, the state-of-the-art and open research challenges of signal processing
techniques for V/HTS systems are presented for the first time, with focus on
novel approaches for efficient interference mitigation. The main signal
processing topics for the ground, satellite, and user segment are addressed.
Also, the critical components for the integration of satellite and terrestrial
networks are studied, such as cognitive satellite systems and
satellite-terrestrial backhaul for caching. All the reviewed techniques are
essential in empowering satellite systems to support the increasing demands of
the upcoming generation of communication networks.
