A New Digital Predictive Predistorter for Behavioral Power Amplifier Linearization

This letter presents a new digital adaptive predistorter (PD) for power amplifier (PA) linearization based on a nonlinear auto-regressive moving average (NARMA) structure. The distinctive characteristic of this PD is its straightforward deduction from the NARMA PA model, without the need of using an indirect learning approach to identify the PD function. The PD itself presents a NARMA structure, and hence it can be quickly implemented by means of lookup tables. Single and multicarrier modulated signals collected from a three-stage LDMOS class AB PA, with a maximum output power of 48-dBm CW have been used to validate the linearity performance of this new predictive predistorter

[1]  C.P. Silva,et al.  A nonlinear ARMA model for simulating power amplifiers , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[2]  R. Marsalek,et al.  From post-distortion to pre-distortion for power amplifiers linearization , 2003, IEEE Communications Letters.

[3]  J. S. Kenney,et al.  Behavioral modeling of nonlinear RF power amplifiers considering memory effects , 2003 .

[4]  J.C. Pedro,et al.  A comparative overview of microwave and wireless power-amplifier behavioral modeling approaches , 2005, IEEE Transactions on Microwave Theory and Techniques.

[5]  F.M. Ghannouchi,et al.  Deembedding static nonlinearities and accurately identifying and modeling memory effects in wide-band RF transmitters , 2005, IEEE Transactions on Microwave Theory and Techniques.

[6]  G. Montoro,et al.  A recursive digital predistorter for linearizing RF power amplifiers with memory effects , 2006, 2006 Asia-Pacific Microwave Conference.

[7]  Wan-Jong Kim,et al.  Piecewise Pre-Equalized Linearization of the Wireless Transmitter With a Doherty Amplifier , 2006, IEEE Transactions on Microwave Theory and Techniques.

[8]  G. Montoro,et al.  A Methodology to Model and Predistort Short-Term Memory Nonlinearities in Power Amplifiers , 2006, 2006 International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits.