Linearization, as a concept for improving signal integrity in radios, has been around for the best part of 100 years (at least dating back to Black's Feedforward patent, filed in the 1920s). A golden period of innovation followed for 80 years, until the turn of the century, when the now quasi-ubiquitous DPD (digital pre-distortion) became the architecture of choice.
The advent of 5G and 6G systems, for example, brings more sophisticated front-end architectures. It is therefore worthwhile revisiting the topic of linearization more generally to make sure that the choice of technique is still optimal.
This white paper provides a review of the subject matter, including a linearization classification system, an overview of the limits and goals of linearization and a measurement example.