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I/Q Imbalance Compensation Using a Nonlinear Modeling Approach

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5 Author(s)
Haiying Cao ; Dept. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Goteborg ; Tehrani, A.S. ; Fager, C. ; Eriksson, T.
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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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 3 )