Title :
Implementing crest factor reduction (CFR) by offsetting digital predistortion (DPD) coefficients
Author :
Braithwaite, R. Neil
Author_Institution :
Powerwave Technol., Santa Ana, CA, USA
Abstract :
A combined approach to digital predistortion (DPD) and crest factor reduction (CFR) is proposed. The new CFR is structured similar to DPD and is implemented by introducing a steady-state offset into the DPD coefficients. The DPD and CFR coefficients are estimated using separate adaptive processes but applied to the transmission path in a common module. Results show that CFR lowers the PAPR of the predistorted signal by 5 dB, which reduces the stress on the peaking transistor in a Doherty PA.
Keywords :
distortion; power amplifiers; power transistors; CFR; DPD coefficients; Doherty PA; PAPR; adaptive process separation; crest factor reduction; gain 5 dB; offsetting digital predistortion coefficients; peaking transistor; power amplifier; stress reduction; Indexes; Patents; Radio frequency; Amplifier distortion; communication system nonlinearities; power amplifier linearization; power amplifiers;
Conference_Titel :
Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), 2012 Workshop on
Conference_Location :
Dublin
Print_ISBN :
978-1-4673-2950-7
Electronic_ISBN :
978-1-4673-2948-4
DOI :
10.1109/INMMIC.2012.6331928