Digital estimation and correction of I/Q mismatch in direct...

Details Digital estimation and correction of I/Q mismatch in direct... Digital estimation and correction of I/Q mismatch in direct...

2006-03-28

2006-03-28

Patel, Jay K. (Department: 2637)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

07020220

ABSTRACT:
An IQ receiver includes an estimator/compensator module to determine and correct IQ mismatch errors between the I and Q channels of the IQ receiver. The estimator module determines a phase compensation factor C1and an amplitude compensation factor C2based on a calibration signal that is injected into the analog front-end of the IQ receiver. A compensator module applies the phase correction factor C1and the amplitude correction factor C2to the baseband output of the Q channel in order to reduce any phase or amplitude errors between the I and Q channels. The estimator module and the compensator module can be efficiently implemented in a digital state machine, or processor, including a digital signal processor.

REFERENCES:
patent: 6009317 (1999-12-01), Wynn
patent: 6330290 (2001-12-01), Glas
patent: 2002/0097812 (2002-07-01), Wiss
patent: 2003/0206603 (2003-11-01), Husted

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