Doherty Feed-Forward Amplifier Performance Using a Novel Crest Factor Reduction Technique

Author

Kim, Wan-Jong ; Cho, Kyoung-Joon ; Stapleton, Shawn P. ; Kim, Jong-Heon

Author_Institution

Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC

Volume

17

Issue

1

fYear

2007

Firstpage

82

Lastpage

84

Abstract

This letter describes a novel iterative crest factor reduction (CFR) technique applied to a Doherty feedforward linear power amplifier (DFFLPA). This novel CFR technique is based on repeated peak cancellations and uses a scaling factor to reduce complexity. According to our results, only three iterations result in over 4-dB reduction for a two carrier WCDMA signal. Experimental results demonstrate that the proposed algorithm was able to enhance the DFFLPA system efficiency from 11.5% to 18.3%

Keywords

FIR filters; feedforward amplifiers; iterative methods; power amplifiers; Doherty power amplifier; code division multiple access; crest factor reduction; error vector magnitude; feedforward linear power amplifier; finite impulse response filter; Broadband amplifiers; Feedforward systems; Finite impulse response filter; Linearity; Low pass filters; Multiaccess communication; OFDM; Peak to average power ratio; Power amplifiers; Radio frequency; Doherty power amplifier (DPA); error vector magnitude (EVM); feed-forward linear power amplifier (FFLPA); finite impulse response (FIR) filter; peak-to-average power ratio (PAPR);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2006.887287

Filename

4052387