Wireless communication device and method for IQ calibration

A method for IQ calibration performed by a wireless communication device, the wireless communication device comprises a transmitting circuit unit, a receiving circuit and a processing circuit, the method comprising:

• generating, by the transmitting circuit, a set of radio frequency (RF) transmitting signals based on a set of digital baseband signals, each of the set of RF transmitting signals has IQ components;
• generating, by the receiving circuit, a set of digital feedback signals based on a set of RF receiving signals obtained from the set of RF transmitting signals;
• and
• obtaining, by the processing circuit, a first set of compensation coefficients for the transmitting circuit and a second set of compensation coefficients for the receiving circuit based on the set of digital baseband signals and the set of digital feedback signals with an IQ calibration model,
• wherein the IQ calibration model comprises a first high-order term set associated with a nonlinear error in the transmitting circuit and a second high-order term set associated with a nonlinear error in the receiving circuit,
• wherein the first higher-order term set comprises terms of:
• a product of a first coefficient and a square of a real part of an i-th digital baseband signal of the set of the digital baseband signals,
• a product of a second coefficient and a square of an imaginary part of the i-th digital baseband signal, and
• a product of a third coefficient, the real part of the i-th digital baseband signal and the imaginary part of the i-th digital baseband signal,
• wherein 1≤i ≤k, k is the number of the digital baseband signal of the set of the digital baseband signals, and
• wherein the first set of compensation coefficients comprises the first coefficient, the second coefficient and the third coefficient.