A multiple-polynomial technique for HPA linearization through RF predistortion.

摘要

The increasing popularity of digital and wireless communication systems creates a need for efficient, distortion-free transmitters. Many of the transmission links in use today employ high power amplifiers (HPAs), which are inherently nonlinear. However, signal predistortion techniques provide an effective means to reduce the levels of signal distortion that could be caused by the HPA nonlinearities.; Throughout this thesis a new predistortion technique is studied. This technique divides the characteristics of an ideal predistorter into various sections in order to model each section with a low order polynomial. The predistorter obtained from this process is called a multipolynomial predistorter.; A detailed study of this predistorter is performed and numerous simulations are carried out to investigate the predistorter's performance on two types of HPAs. Also, a comparison is made with other predistorters proposed in literature to identify the predistorters' abilities to linearize a HPA.