Digital Predistortion Linearization for Power Efficient Wideband Communication Systems.

Some of the technological challenges of the NR-5G that must be addressed in the design of radio transceivers in the sub 6 GHz band are related to: a) ensuring the linearity of signals presenting bandwidths of hundreds of MHz (always increasing trend) or multi-band transmissions with peak factors exceeding 10 dB (due to multi-carrier modulations) in order to ensure high transmission rates; b) improving energy and computational efficiency, as more dense deployments of base stations is expected to scale down the need for transmitted power; c) transmitting architectures with multiple antennas (massive MIMO in millimeter bands) and multiple power amplifiers (PAs) to apply beamforming techniques that allow increasing the capacity and decreasing the radiated power. This talk will focus on the first two challenges, by discussing the necessary digital baseband signal processing (signal generation, mismatch control and linearization) to guarantee linearity levels in high efficient amplification topologies based on dynamic supply strategies (class G amplifier, envelope tracking) or dynamic load modulation strategies (such as, for example, the hybrid outphasing transmitter).