Power Amplifier Behavioural Model Mismatch Sensitivity and the Impact on Digital Predistortion Performance
2009 (English)In: 2009 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-3, New York: IEEE , 2009, 338-341 p.Conference paper (Refereed)
This paper presents an investigation of poweramplifier behavioural model performance sensitivity to in-bandreflections. The measurement system and model extractionprocess is presented together with the results and an analysis ofthe effect of parameter variations in a digitally predistortedsystem. A load-pull system is used together with a digitalbaseband model extraction system to identify the impact onmodelling performance. The results show that the modelperformance varies greatly with in-band reflection magnitudeand phase on the amplifier output. It is also shown that a digitalpredistortion based on a model extracted at matched conditions,where it gives an excellent improvement of 20 dB in adjacentchannel leakage ratio (ACLR), gives a poor improvement of 7 dBfor miss-matched conditions with as low reflections as Γ=0.2(return loss 14 dB). This indicates that in-band reflections needto be considered and adaptive predistortion used also for lowVSWR system like base-stations for telecommunication.
Place, publisher, year, edition, pages
New York: IEEE , 2009. 338-341 p.
Microwaves, Power amplifiers
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-11672DOI: 10.1109/EUMC.2009.5296131ISI: 000275097800086ISBN: 978-1-4244-4748-0OAI: oai:DiVA.org:kth-11672DiVA: diva2:279192
37th European Microwave Conference, Rome, ITALY, SEP 29-OCT 01, 2009
QC 201010152009-12-022009-12-022010-10-15Bibliographically approved