Methods and devices generating a calibration signal for an IQ imbalance

1. A communication circuitry for correcting a phase imbalance, the communication circuitry device comprising at least one processor configured to:

estimate a non-linear component of a reference signal based on a measurement of a tone at a first harmonic of a plurality of harmonics of the reference signal;

estimate an in-phase component of the reference signal based on a difference between the estimated non-linear component and a measurement of a tone at a second harmonic of the plurality of harmonics of the reference signal; and

generate a calibration signal based on the estimated in-phase component.

2. The communication circuitry of claim 1 , further configured to transmit the reference signal according to a polar modulation.

3. The communication circuitry of claim 2 , wherein the reference signal is a carrier wave.

4. The communication circuitry of claim 1 , wherein the reference signal comprises phase non-linearity.

5. The communication circuitry of any of claim 1 , wherein the first harmonic of the plurality of harmonics is a harmonic of the reference signal in a positive frequency.

6. The communication circuitry of claim 5 , wherein the first harmonic of the plurality of harmonics is the third positive harmonic of the reference signal.

7. The communication circuitry of any of claim 1 , wherein the second harmonic of the plurality of harmonics is a harmonic of the reference signal in a negative frequency.

8. The communication circuitry of claim 7 , wherein the second harmonic of the plurality of harmonics is the first negative harmonic of the reference signal.

9. The communication circuitry of any of claim 1 , further comprising a transmitter, wherein the transmitter is configured to transmit a signal according to a polar modulation.

10. The communication circuitry of any of claim 1 , further comprising a receiver, wherein the receiver is configured to receive a signal according to a quadrature amplitude modulation.

11. The communication circuitry of any of claim 1 , wherein the transmitter and the receiver are connected via a loopback.

12. The communication circuitry of any of claim 1 , wherein the loopback comprises a phase locked loop.

13. The communication circuitry of any of claim 1 , wherein the reference signal is transmitted from the transceiver to the receiver via the loopback, wherein the loop back comprises a feedback from the receiver to the transmitter.

14. The communication circuitry of any of claim 1 , wherein the measurement of a tone is a Discrete Fourier Transform of a tone.

15. The communication circuitry of any of claim 1 , wherein the calibration signal is configured to calibrate a quadrature amplitude modulation signal.

16. The communication circuitry of any of claim 1 , wherein the calibration signal is configured to calibrate an IQ imbalance of the quadrature amplitude modulation signal.

17. A method for correcting a phase imbalance, the method comprising:

estimating a non-linear component of a reference signal based on a measurement of a tone at a first harmonic of a plurality of harmonics of the reference signal;

estimating an in-phase component of the reference signal based on a difference between the estimated non-linear component and a measurement of a tone at a second harmonic of the plurality of harmonics of the reference signal; and

generating a calibration signal based on the estimated in-phase component.

18. The method of claim 17 , further comprising transmitting the reference signal according to a polar modulation.

19. The method of claim 18 , wherein the reference signal is a carrier wave.

20. The method of claim 17 , wherein the reference signal comprises phase non-linearity.