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Digital In-phase(I) and Quadrature phase(Q) imbalance correction schemes are presented for improving the balance between I & Q signals by rejecting the image frequencies due to imbalance. The imbalance errors in the analog and digital demodulation schemes are highlighted. Simplified correction schemes are presented for time and frequency domain imbalances. These correction schemes are useful in radar and communication systems. In this paper, a digital I-Q scheme is also presented for a pulse Doppler radar, along with hardware configuration for implementation.

I-Q imbalance correction in time and frequency domains with application to pulse doppler radar