Image rejection filter based on blind source separation for low-IF receivers

In this paper the low-IF receiver architecture, the image interference due to the IF domain, phenomena also referred as I/Q imbalance and a modification for a blind source separation algorithm for image rejection are presented. The modified algorithm considers all the received samples of IF signal for the estimation of the I/Q imbalance parameters. The resulting image rejection filter´s major advantage is the single clock domain implementation at the cost of power consumption increase. A Simulink model was created to check the availability of the enhanced algorithm, its performance measured and compared to the existing implementation. Simulations show that the proposed filter achieves the same performance in terms of IRR as the reported method.