High Efficiency RF Transmitter System Architecture Investigation for Mobile WiMAX Applications
2008 (English)Manuscript (preprint) (Other academic)
Wireless broadband digital communicationsystems are facing more and more critical power efficiencyproblems. Crest Factor (PAPR) is reported to be in 10-12dBrange for WiMAX 802.16e systems implementing OFDMIFFT-1024 and 64-QAM modulation. In this work,outphasing (LINC) and Polar transmitter architectures areinvestigated and compared with Direct Conversionarchitecture. Complete system solution targeting 23dBmoutput power is evaluated. Simulation result shows LINCconsumes more power than DC if non-clipping modulationscheme used and its complete system efficiency may not be ashigh as expected when linear combiner used. And polarsystem has stringent 3 degree phase matching and 0.5dB gainmatching requirements constrained by RCE and spectrummask specifications.
Place, publisher, year, edition, pages
WiMAX, OFDM, IFFT, LINC, Polar, Power Amplifier, Power Combiner.
IdentifiersURN: urn:nbn:se:kth:diva-72176OAI: oai:DiVA.org:kth-72176DiVA: diva2:487309
QC 201304222013-04-222012-01-312013-04-22Bibliographically approved