Rational Function Based Model for the Joint Mitigation of I/Q Imbalance and PA Nonlinearity

Author

Aziz, Muzzamil ; Rawat, Meenakshi ; Ghannouchi, Fadhel M.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Calgary, Calgary, AB, Canada

Volume

23

Issue

4

fYear

2013

fDate

Apr-13

Firstpage

196

Lastpage

198

Abstract

Nonlinearity in power amplifiers and In-phase and Quadrature phase (I/Q) imperfections degrade the performance of direct conversion transmitters. In this letter, a novel rational function based model is proposed to jointly alleviate both these impairments. The performance of the model is evaluated in terms of Normalized mean square error (NMSE) and Adjacent channel error power ratio (ACEPR). Simulation results and measurements show that the model has an improvement of around 2 dB NMSE and around 3 dB in ACEPR than the state of the art parallel Hammerstein based model . Also the model attains a lower complexity while maintaining almost same performance.

Keywords

mean square error methods; power amplifiers; I/Q imbalance; PA nonlinearity; adjacent channel error power ratio; direct conversion transmitters; joint mitigation; normalized mean square error; parallel Hammerstein based model; power amplifiers; rational function based model; ACEPR; I/Q imbalance; NMSE; condition number; dispersion coefficient; power amplifier (PA); predistortion;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2013.2247751

Filename

6490437