New power amplifier model for TD-LTE communication system
Nan Jingchan · Computer Engineering and Applications Journal · 2015
Memory polynomials have been widely used to model PA behavior because of their easy identification. This paper proposes a new rational function power amplifier model for TD-LTE communication system on account of research of the conventional memory polynomial. The presented model based on the ratio of two general memory polynomials which not only characterizes the small-signal behavior of PA, but also predicts large-signal behavior accurately, and makes use of LS techniques to extract the model parameters. Model test is conducted by the strong nonlinear input and output data exported from the DPA circuit which is designed by NXP PA models in ADS circumstance. The results indicate the presented new model achieves better performance than conventional memory polynomial model, it has higher precision to model PA characteristics, the rational function model has important reference value on development and research of the RF PA behavioral modeling.