Method and system for measuring receiver mixer IQ mismatch
View Patent ↗Aspects for measuring receiver mixer IQ mismatch in a transceiver are described. The measuring includes providing a training signal for a receiver mixer, the training signal having periodic, uncorrelated I and Q signals. A phase mismatch in the receiver mixer is determined from IQ correlation over a unit period. A gain mismatch in the receiver mixer is determined from a power estimate of both I and Q signal for the unit period.
1. A method for measuring receiver mixer IQ mismatch in a transceiver, the method comprising:
providing a training signal for a receiver mixer, the training signal having periodic, uncorrelated I and Q signals;
determining a phase mismatch in the receiver mixer from IQ correlation over a unit period; and
determining a gain mismatch in the receiver mixer from a power estimate of both I and Q signals for the unit period.
2. The method of claim 1 wherein providing a training signal comprises closing an RF signal path between a transmitter and the receiver mixer and generating the training signal with the transmitter.
3. The method of claim 1 comprising estimating the IQ mismatch iteratively.
4. The method of claim 3 comprising utilizing a pre-compensated signal as a measurement signal for the iterative estimation.
5. The method of claim 3 comprising performing post-correction using a latest available correction parameter and estimating residual mismatch from post-correction signals.
6. The method of claim 1 comprising utilizing matrix multiplication to perform mismatch compensation.
7. A system for estimation of receiver mixer IQ mismatch during signal modulation, the system comprising
a transceiver, the transceiver including a transmitter and a receiver, the transmitter providing a training signal for a receiver mixer, the training signal having periodic, uncorrelated I and Q signals; and
a processor coupled to the transceiver, the processor determining a phase mismatch in the receiver mixer from tO correlation over a unit period, and determining a gain mismatch in the receiver mixer from a power estimate of both I and Q signals for the unit period.
8. The system of claim 7 wherein the transmitter provides a training signal on a closed an RF signal path between the transmifter and the receiver mixer.
9. The system of claim 7 wherein the processor estimates the IQ mismatch iteratively.
10. The system of claim 9 wherein the processor utilizes a pre-compensated signal as a measurement signal for the iterative estimation.
11. The system of claim 9 wherein the processor performs post-correction using a latest available correction parameter and estimates residual mismatch from post-correction signals.
12. The system of claim 7 wherein the processor utilizes matrix multiplication to perform mismatch compensation.
13. A method for measuring receiver mixer IQ mismatch in a transceiver, the method comprising:
utilizing a transmitter to provide a training signal for a receiver mixer, the training signal having periodic, uncorrelated I and Q signals; and
utilizing a processor to determine a phase mismatch in the receiver mixer from IQ correlation over a unit period, and to determine a gain mismatch in the receiver mixer from a power estimate of both I and Q signals for the unit period.
14. The method of claim 13 wherein utilizing a transmitter comprises generating the training signal with the transmitter on a closed RF signal path between a transmitter and the receiver mixer.
15. The method of claim 13 wherein utilizing a processor comprising utilizing the processor for estimating the IQ mismatch iteratively.
16. The method of claim 15 comprising utilizing a pre-compensated signal as a measurement signal for the iterative estimation.
17. The method of claim 15 comprising performing post-correction using a latest available correction parameter and estimating residual mismatch from post-correction signals.
18. The method of claim 13 comprising utilizing the processor for matrix multiplication to perform mismatch compensation.