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M. Gadringer, Ch. Schuberth, G. Magerl:
"Behavioral Modeling of the Frequency Translation Process in Direct Conversion Transmitters";
International Journal of RF and Microwave Computer-Aided Engineering, vol. 20 (2010), 347 - 359.

This article presents a black-box model that can be applied to represent the nonlinear dynamic behavior of a direct conversion transmitter excluding the power amplifier. Several distortion mechanisms are excited and compensated using only magnitude measurements of the output signal components. Te information extracted in this way is used to parameterize the model. The validity of the suggested approach is confirmed by comparing the measured and the predicted transmitters's response, when driven by broadband input signals.