This talk focuses on an essential aspect of Green Communication, i.e., transmitter efficiency.
PA and feeder networks consume 65% of the power in a base station. Reducing power
consumption in PA directly impacts the overall power consumption. Enhancing PA efficiency
has a huge social impact by reducing the CO2 footprint in wireless network technology. It is
well known that 5G/6G applications have signals with high PAPR, and achieving good
efficiency in PA will be challenging in such a scenario. The transmission bandwidth has
increased five times in 5th-generation and beyond communication systems compared to 4G
communication, which imposes stringent conditions on power amplifier design in terms of
linearity and efficiency. This talk presents critical challenges for implementing a linearization
solution for broadband power amplifiers. The limitations and salient features of digital and
analog predistortion implementation will be offered. The talk will further explore implementing
hybrid predistortion techniques to achieve lower implementation costs with enhanced
performance. It is shown that for carrier aggregated broadband 5G communication signals,
the proposed hybrid solution provides a lower footprint area and lowers digital signal
processing cost compared to state-of-the-art digital predistortion solutions, which is a
lucrative offering for mmWave and terahertz communication systems. In addition, proposed
techniques are evaluated for MIMO and beamforming applications for 5G/6G applications
while considering the cost of digital implementation into consideration. An innovative
application of the PA digital linearization technique is shown for multiplier nonlinearity, where
the C-band signal is upconverted to the mmWave signal without additional LO, hence
providing low-cost mmWave signal generation.