I/Q Imbalance Compensation Using a Nonlinear Modeling Approach
Journal article, 2009

In-phase/quadrature (I/Q) imbalance is one of the main sources of distortion in RF modulators. In this paper, a dual-input nonlinear model based on a real-valued Volterra series is proposed for compensation of the nonlinear frequency-dependent I/Q imbalance. First, different sources of distortion are identified from experimental measurements, then a dual-input nonlinear I/Q imbalance model is developed. Further, the inverse model is used for I/Q imbalance compensation. Finally, the performance of the I/Q imbalance compensator is evaluated with both simulations and experiments. In comparison with previously published results, the proposed I/Q imbalance compensator shows significantly improved performance. Thus, we prove that a complete nonlinear I/Q imbalance compensation can minimize the effects of the RF modulator in high-performance digital communication systems.

modulator

nonlinearity

measurement system

Volterra series.

I/Q imbalance

Author

Haiying Cao

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Ali Soltani Tehrani

GigaHertz Centre

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

Christian Fager

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Thomas Eriksson

GigaHertz Centre

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

Herbert Zirath

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 57 3 513-518

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TMTT.2008.2012305

More information

Created

10/7/2017