A Low-complexity I/Q Imbalance Calibration and DC Offset Calibration Method in 5G Millimeter-Wave Communication

RF receiver has a wide range of application scenarios in 5G millimeter-wave communication, but its non-ideal characteristics of devices and circuits will affect the subsequent signal processing, of which I/Q mismatch and DC offset are the two most important influencing factors. The proposed method enables the completion of power-on calibration immediately after the antenna array receiver starts up. With the presented circuit, the impact of receiver DC offset can be reduced significantly, and the amplitude mismatch and phase mismatch parameters can be accurately determined, leading to effective suppression of the mirror signal. The I/Q mismatch utilizes a digital blind estimation calibration method, and the mirror image rejection ratio(IRR) after calibration can typically exceed 50dB.