Title :
A 20-W Chireix Outphasing Transmitter for WCDMA Base Stations
Author :
Huttunen, Anu ; Kaunisto, Risto
Author_Institution :
Nokia Res. Center, Helsinki
Abstract :
A Chireix outphasing transmitter for Band I wideband code-division multiple-access base stations was implemented using a nonisolating power combiner and two high-efficiency saturated class-B power amplifiers for 20-W single-carrier power levels. Novel adaptive background calibration algorithms were developed and demonstrated for the mismatch calibration and phase predistortion of the two transmitter chains. The complete demonstrator was able to achieve an average efficiency of 30% for a 3GPP TestModel64 signal, measured at a channel output power of 20 W and an adjacent channel power ratio of -45 dB.
Keywords :
calibration; code division multiple access; power amplifiers; power combiners; radio transmitters; 3GPP TestModel 64 signal; Chireix outphasing transmitter; WCDMA base stations; adaptive background calibration; class-B power amplifiers; nonisolating power combiner; phase predistortion; power 20 W; wideband code-division multiple-access base stations; Base stations; Broadband amplifiers; Calibration; High power amplifiers; Multiaccess communication; Power combiners; Power measurement; Predistortion; Testing; Transmitters; Chireix outphasing; RF power amplifiers (PAs); linear amplification with nonlinear components (LINC); linear transmitters; predistortion;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.907140
