Base-band derived volterra series for power amplifier modeling

• Published in: 2009 IEEE MTT-S International Microwave Symposium Digest pp. 1361 - 1364
• Main Authors: Lima, E.G., Cunha, T.R., Teixeira, H.M., Pirola, M., Pedro, J.C.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2009
• Subjects: Chebyshev approximation; Chebyshev functions; Hydrogen; modeling; Nonlinear systems; Polynomials; Power amplifiers; Power system modeling; Predistortion; Radio frequency; Radiofrequency amplifiers; Telecommunications; Volterra series
• ISBN: 1424428033; 9781424428038
• ISSN: 0149-645X
• DOI: 10.1109/MWSYM.2009.5165958

This paper proves that the traditional way of deriving power amplifier low-pass equivalent complex-signal Volterra models from their original band-pass RF real-signal Volterra models is too restrictive, and so does not lead to an optimal model. Then, it proposes a much richer alternative approach. Instead of deriving the base-band Volterra model from the RF Volterra model, we started by a general Volterra series expansion of a complex-signal to only then impose the restrictions of odd parity required by the low-pass equivalent polynomial approximation. This way, not only we prove that the theoretical reticence that was raised to similar approaches previously proposed for the memoryless polynomial and the memory polynomial were unfounded, as experimental results fully justified this novel approach.