Concurrent dual-band transmitter behavioral modeling with physically motivated 2-D rational functions

Abstract

This paper proposes a 2-D rational function based behavioral modeling approach for concurrent dual-band transmitters. It has been shown with measurement data that the recursive property of rational function model, being closer to the physical analogy of PA as feedback system, allows for more accurate modeling. Based on good performance of 2-D rational function, a novel two-step model has been proposed which retains advantages of recursive modeling, yet can be applied in an open loop configuration. The proposed model is compared with the state-of-the-art 2D memory polynomial model for behavioral modeling of concurrent dual-band transmitter setup. Using proposed model, performance improvement up to 6-dB in terms of normalized mean square error (NMSE) and performance improvement up to 8-dB in terms of adjacent channel error power ratio (ACEPR) is achieved as compared to the state-of-the art 2D memory polynomial model.