Title :
Feedforward amplifier for WCDMA base stations with a new adaptive control method
Author :
Young Yun Woo ; Youngoo Yang ; Jaehyok Yi ; Joongjin Nam ; Jeong Hyeon Cha ; Bumman Kim
Author_Institution :
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol. (POSTECH), South Korea
Abstract :
This paper describes a feedforward amplifier with a new adaptive control method. For the modulated signal with a high peak-to-average ratio, the residual output error level of the feedforward amplifier can be further reduced by adjusting the 1st loop control parameters to have an imperfect signal cancellation since an error amplifier generates less distortion in the case. For verification, a baseband signal simulation and experiments have been performed. A 30 W feedforward amplifier for WCDMA base stations at 2.14 GHz shows a 4 dB improvement of linearization when it is controlled by the proposed method.
Keywords :
UHF power amplifiers; adaptive control; circuit simulation; circuit testing; code division multiple access; feedforward; linearisation techniques; telecommunication computing; telecommunication control; 2.14 GHz; 30 W; WCDMA base stations; adaptive control method; base station power amplifiers; baseband signal simulation; error amplifier distortion; feedforward amplifier; imperfect signal cancellation; linearization; loop control parameters; modulated signal peak-to-average ratio; residual output error level; Adaptive control; Base stations; Distortion; Error correction; Linearity; Microwave amplifiers; Multiaccess communication; Peak to average power ratio; Power amplifiers; Signal generators;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011743
