Evolution of the Transmit Radio Front-End from 2G to 4G for mobile devices and infrastructure, with cost and energy efficiency driving demand, has resulted in the widespread adoption of envelope tracking and Doherty techniques for efficiency enhancement, augmented by digital predistortion. The step-change in 5G requirements, especially bandwidth, operating frequency and beamforming, presents an opportunity for more significant technical and commercial differentiation.
This paper reviews the subject matter of Linearization, proposing a classification method. Within that classification, the incumbents are shown to be just two pieces in a much broader, efficient and intrinsically linear, radio front-end solution jigsaw.
Considering the bigger picture of practical 5G frontend implementation challenges, their cohorts offer potentially advantageous side-effects that transcend mere energy efficiency and linearity concerns.