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US 2006/0133548 A1Published application
Apparatus and method to calibrate amplitude and phase imbalance for communication receivers
OwnerJoungheon Oh, Yuh-Chun Lin +1inventors
InventorsJoungheon Oh, Yuh-Chun Lin, Chia-En Wu
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Abstract
The present invention provides apparatus and method for calibrating I/Q imbalance in a direct conversion transmitter-receiver, including generating a complex sinusoidal signal with a center frequency at ωi, sending the sinusoidal signal to the receiver and using FFT to estimate the I/Q the phase φ, the gain imbalance ε, and phase imbalance θ. The input signal is calibrated according to the estimated I/Q amplitude and phase imbalance.
Claims20
An apparatus, comprising:
- a modulator to generate a complex sinusoidal signal;
- a receiver to receive the generated complex sinusoidal signal;
- a processor to estimate an I/Q imbalance using the received complex sinusoidal signal and to calibrate the I/Q imbalance to determine I/Q calibration factors to apply to subsequently received signals.
A method for calibrating I/Q imbalance, comprising:
- generating a complex sinusoidal signal;
- estimating an I/Q imbalance using the generated complex sinusoidal signal;
- and
- calibrating the input signal according to the estimated I/Q imbalance.
1 more element
A method for correcting for I/Q imbalance, comprising:
- generating a calibration signal in a calibration mode;
- determining one or more calibration factors to correct for I/Q imbalance using the generated calibration signal in the calibration mode;
- and
- applying the calibration factors to a received signal in a normal receive mode to compensate the I/Q imbalance.
1 more element
Dependencies are inferred from the claim text.