Kalman filtering based compensation for I/Q imbalance and CFO in time-varying MIMO OFDM systems

Authors:
Jingbo Gao;Xu Zhu;Hai Lin;Asoke K. Nandi
Affiliations:
Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, UK;Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, UK;Department of Electrical and Information Systems, Osaka Prefecture University, Osaka, Japan;Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, UK
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

I/Q imbalance and carrier frequency offset (CFO) are two typical radio frequency (RF) circuit analog impairments in wireless communication systems, and degrade the system performance severely. In this paper, we propose a novel Kalman filtering based compensation scheme for I/Q imbalance and CFO in time-varying MIMO OFDM systems. To circumvent CFO and track time variations of wireless communication channels, the CFO is absorbed into the state vector of the equivalent channel model. Moreover, the inter-carrier interference (ICI) caused by phase shift of the cyclic prefix (CP) in the equivalent system is removed by decision feedback filtering, which allows low complexity compensation on each subcarrier independently. Simulation results show that the proposed approach can compensate for I/Q imbalance and CFO effectively and is robust again time variations.