Title :
A New Wideband Adaptive Digital Predistortion Technique Employing Feedback Linearization
Author :
Kim, Jangheon ; Woo, Young Yun ; Moon, Junghwan ; Kim, Bumman
Author_Institution :
Pohang Univ. of Sci. & Technol., Gyeongbuk
Abstract :
We develop a new wideband digital feedback predistortion (WDFBPD) technique for modulated signals with wide bandwidths by combining digital feedback predistortion (DFBPD) linearization and memory-effect compensation techniques. For the experiments, a class-AB amplifier using an LDMOSFET with 90-W peak envelope power is employed. The proposed technique is compared with existing DFBPD and memory polynomial (MP) techniques for a 2.14-GHz forward-link WCDMA 2FA signal with 10-MHz carrier spacing. The experimental results show that the new WDFBPD technique has better linearization performance than conventional DFBPD and lower computational complexity than the MP technique.
Keywords :
MOSFET; code division multiple access; distortion; feedback amplifiers; linearisation techniques; modulation; polynomials; radiocommunication; wideband amplifiers; LDMOSFET; carrier spacing; class-AB amplifier; computational complexity; conventional DFBPD; digital feedback predistortion linearization technique; forward-link WCDMA 2FA signal; frequency 2.14 GHz; memory polynomial technique; memory-effect compensation technique; power 90 W; power amplifier; wideband code division multiple access; wideband digital feedback predistortion technique; Bandwidth; Broadband amplifiers; Computational complexity; Digital modulation; Feedback; Multiaccess communication; Polynomials; Power amplifiers; Predistortion; Wideband; Memory effects; power amplifier (PA); predistortion (PD); wideband code division multiple access (WCDMA);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.914362
