A subspace method for the estimation of gain/phase mismatches and I/Q imbalances in a receive array antenna

Authors:
Zhiwen Zhu;Xinping Huang
Affiliations:
Communications Research Centre Canada, Ottawa, Ontario, Canada;Communications Research Centre Canada, Ottawa, Ontario, Canada
Venue:
CIIT '07 The Sixth IASTED International Conference on Communications, Internet, and Information Technology
Year:
2007

Citing 3
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Abstract

This paper proposes a subspace method to estimate impairment compensation coef cientsin a receive array antenna. These impairments due to imperfections in the analog front end circuits are the gain/phase mismatches among the different antenna elements and imbalances between in-phase and quadrature (I/Q) components. A signal model in the presence of the gain/phase mismatches and I/Q imbalances is developed first. Then a signal subspace constraint is formulated such that a simple method can be used to estimate the mismatches and imbalances. It is shown that the method results in an unambiguous estimate. Its performance is also evaluated using numerical simulations.