Title :
Linearization of an Outphasing Amplifier for Wide-band Multi-carrier Signals
Author :
Finnerty, Keith ; Wesson, Robin ; Dooley, John ; Acar, Mustafa ; van der Heijden, Mark P. ; Farrell, Ronan
Author_Institution :
Dept. of Electron. Eng., Nat. Inst. of Ireland, Maynooth, Ireland
Abstract :
A novel method using self-organizing maps to determine the optimum ranges to partition the vector switched Volterra series is presented. Analyzing characteristics of the input signal it is possible to separate different regions of operation. Partitioning of the correction algorithm provides the ability to target regions of different non-linear behavior with separate coefficients. This work is validated with experimentally measured results and shows an adjacent channel power ratio (ACPR) of -49/-50 dBc achieved for a four carrier Wideband Code-Division Multiple Access (WCDMA) signal using a 19 watt digital outphasing amplifier from NXP.
Keywords :
Volterra series; electronic engineering computing; linearisation techniques; power amplifiers; self-organising feature maps; signal processing; wideband amplifiers; ACPR; WCDMA signal; adjacent channel power ratio; carrier wideband code-division multiple access signal; correction algorithm; digital outphasing amplifier linearization; input signal analyzing characteristics; nonlinear behavior; power 19 W; power amplifier; self-organizing maps; vector switched Volterra series partition; wideband multicarrier signals; Bandwidth; Clustering algorithms; Neurons; Predistortion; Robustness; Training; Vectors; Linear amplification with non-linear Components (LINC); linearization; outphasing amplifier; predistortion;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2014.2382653
