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Blind Estimation and Compensation of Frequency-Flat I/Q Imbalance Using Cyclostationarity

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4 Author(s)
Chia-Pang Yen ; InterDigital Commun. LLC, Melville, NY ; Yingming Tsai ; Guodong Zhang ; Robert Olesen

I/Q imbalance is one of the major concerns in the design of direct-conversion front-end receivers in high data rate wireless networks. To address the challenge, various I/Q imbalance estimation and compensation algorithms have been proposed in the literature. In this paper, we propose a blind cyclostationary based estimation and compensation of frequency-flat I/Q imbalance. The proposed blind estimation algorithm uses second-order statistics to compensate I/Q imbalance without estimating the mismatch parameters and is an unbiased estimator when a DC offset exists at the receiver. The performance of our approach is evaluated and compared to other existing blind I/Q imbalance estimation algorithms.

Published in:

Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th

Date of Conference:

21-24 Sept. 2008