Method and device for calibrating iq imbalance and dc offset of rf tranceiver
AssigneeElectronics and Telecommunications Research Institute
InventorsIk Soo EO, Sang-Kyun Kim, Cheon Soo KIM, Jang Hong CHOI
Life of this patent
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Abstract
A method and device for calibrating a DC offset and an I-Q imbalance component of an RF transceiver, the method including inputting a test signal into a transmitter, and converting the test signal into an analogue test signal; converting the analogue test signal using a transmitting mixer; sub-sampling a signal output from the transmitting mixer; and computing a DC offset calibrating constant number and an I-Q imbalance calibrating constant number from a sub-sampled signal.
Claims12
A method for calibrating a DC offset and an I-Q imbalance component of an RF transceiver, the method comprising:
- inputting a test signal into a transmitter, and converting the test signal into an analogue test signal;
- converting the analogue test signal using a transmitting mixer;
- sub-sampling a signal output from the transmitting mixer;
- and
- computing a DC offset calibrating constant number and an I-Q imbalance calibrating constant number from a sub-sampled signal,
- wherein a frequency fs of the test signal, a carrier frequency fc and a sub-sampling frequency fss satisfy the following equations [1-1] to [1-3],
- kf
- SS
- ≤
- f
- C
- ≤
- (
- k
- +
- 1
- )
-
- f
- SS
- ,
- [
- Equation
-
-
- 1
-
- -
-
- 1
- ]
- (
- k
- +
- 1
- 2
- )
-
- f
- SS
- ≥
- f
- C
-
-
- and
- [
- Equation
-
-
- 1
-
- -
-
- 2
- ]
- 1
- 2
-
- f
- SS
- ≥
- f
- C
- -
- kf
- SS
- +
- f
- S
- .
- [
- Equation
-
-
- 1
-
- -
-
- 3
- ]
- where k is a constant number.
(canceled)
A device for calibrating a DC offset and an I-Q imbalance component of an RF transceiver comprising a transmitter and a receiver, the device comprising:
- a transceiving signal error estimator for estimating a transmitting DC offset and a transmitting I-Q imbalance component generated by the transmitter, and for estimating a receiving DC offset and a receiving I-Q imbalance component generated by the receiver;
- a transmitting signal compensator for compensating a transmitting signal with reference to the transmitting DC offset and the transmitting I-Q imbalance component estimated in the transceiving signal error estimator;
- and
- a receiving signal compensator for compensating a receiving signal with reference to the receiving DC offset and the receiving I-Q imbalance component estimated in the transceiving signal error estimator,
- wherein the transceiving signal error estimator computes the transmitting DC offset and the transmitting I-Q imbalance component from a signal input into the receiver through a single branch of the receiver that bypasses each receiving mixer of the receiver.
(canceled)
Dependencies are inferred from the claim text.