An improvement method for reducing power amplifiers memory effects based on complex gain predistortion

• Main Authors: Varahram, Pooria, Mohammady, Somayeh, Hamidon, Mohd Nizar, Mohd Sidek, Roslina, Khatun, Sabira
• Format: Article
• Language: English
• Published: American-Eurasian Network for Scientific Information 2010
• Online Access: http://psasir.upm.edu.my/id/eprint/13041/1/An%20improvement%20method%20for%20reducing%20power%20amplifiers%20memory%20effects%20based%20on%20complex%20gain%20predistortion.pdf; http://psasir.upm.edu.my/id/eprint/13041/; http://ajbasweb.com/old/ajbas_july_2010.html

Efficient RF power amplifiers used in third generation systems require linearization in order to reduce adjacent channel inter-modulation distortion, without sacrificing efficiency. Digital baseband predistortion is a highly cost-effective way to linearize power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (W-OFDM), PA memory effects can no longer be ignored. In this paper we proposed a technique for adaptation of digital predistorter that considers memory effects in power amplifiers.