Title :
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
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;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2247751
