Method and system for correcting receiver mixer IQ mismatch
View Patent ↗A system for correcting an IQ mismatch in a receiver mixer is disclosed and may include one or more circuits that generate an IQ correlation with a training signal having periodic, uncorrelated I and Q signals. The one or more circuits may estimate a gain mismatch based on a power estimate of the periodic, uncorrelated I and Q signals over a unit period. The one or more circuits may estimate a phase mismatch based on the IQ correlation over the unit period, and may apply at least one correction parameter to the receiver mixer. The at least one correction parameter may be based on the gain mismatch estimate and the phase mismatch estimate. The one or more circuits may provide the training signal on a closed RF signal path between a transmitter and the receiver mixer, and may estimate the IQ mismatch iteratively.
1. A system for correcting an IQ mismatch in a receiver mixer, the system comprising:
one or more circuits that generate an IQ correlation with a training signal having periodic, uncorrelated in-phase (I) and quadrature (Q) signals;
said one or more circuits estimate a gain mismatch based on a power estimate of said periodic, uncorrelated I and Q signals over a unit period;
said one or more circuits estimate a phase mismatch based on said IQ correlation over said unit period; and
said one or more circuits apply at least one correction parameter to the receiver mixer, wherein said at least one correction parameter is based on said gain mismatch estimate and said phase mismatch estimate.
2. The system of claim 1 , wherein said one or more circuits provides said training signal on a closed RF signal path between a transmitter and the receiver mixer.
3. The system of claim 1 , wherein said one or more circuits estimates the IQ mismatch iteratively.
4. The system of claim 1 , wherein said one or more circuits estimates said at least one correction parameter iteratively.
5. The system of claim 3 , wherein said one or more circuits utilizes a pre-compensated signal as a measurement signal for said iterative estimation.
6. The system of claim 3 , wherein said one or more circuits performs post-correction using a latest available correction parameter, and estimates residual mismatch from post-correction signals.
7. The system of claim 6 , wherein said one or more circuits performs mismatch compensation using matrix multiplication, during said post-correction.
8. A method for correcting an IQ mismatch in a receiver mixer, the method comprising:
generating an IQ correlation with a training signal having periodic, uncorrelated in-phase (I) and quadrature (Q) signals;
estimating a gain mismatch based on a power estimate of said periodic, uncorrelated I and Q signals over a unit period;
estimating a phase mismatch based on said IQ correlation over said unit period; and
applying at least one correction parameter to the receiver mixer, wherein said at least one correction parameter is based on said gain mismatch estimate and said phase mismatch estimate.
9. The method of claim 8 , comprising providing said training signal on a closed RF signal path between a transmitter and the receiver mixer.
10. The method of claim 8 , wherein the IQ mismatch is estimated iteratively.
11. The method of claim 10 , comprising:
performing post-correction using a latest available correction parameter; and
estimating residual mismatch from post-correction signals.
12. The method of claim 11 , comprising performing mismatch compensation using matrix multiplication, during said post-correction.
13. The method of claim 8 , wherein said at least one correction parameter is estimated iteratively.
14. The method of claim 10 , comprising utilizing a pre-compensated signal as a measurement signal for said iterative estimation.