US 2011/0216858 A1 · METHOD AND DEVICE FOR CORRECTING IQ IMBALANCE OF BASEBAND SIGNALS IN WIRELESS COMMUNICATION RECEIVER

Abstract

A method and a device for correcting In-phase/Quadrature (IQ) imbalance in baseband signals of a wireless communication receiver are disclosed. The method includes the following: the receiver receives Radio Frequency (RF) signals, and processes the signals to generate In-phase (I) signals and Quadrature (Q) signals; the receiver calculates to obtain an autocorrelation value E(|I|2) of the I signal, an autocorrelation value E(|Q|2) of a current Q signal, and a cross-correlation value E(IQ) of the I signal and the current Q signal; the receiver computes E(|I|2), (|Q|2) and E(IQ) through arithmetical operations to obtain an estimate value Ân of a current amplitude imbalance calibration factor and an estimate value {circumflex over (P)}n of a current phase imbalance calibration factor; and the receiver corrects the current Q signal according to Ân and {circumflex over (P)}n. The embodiments reduce operations.

Claims10

Dependent claims

A method for correcting In-phase/Quadrature (IQ) imbalance of baseband signals in a wireless communication receiver, comprising:

receiving, by the receiver, Radio Frequency (RF) signals, and processing the signals to generate an In-phase (I) signal and a Quadrature (Q) signal;
calculating an autocorrelation value E(|I|2) of the I signal, an autocorrelation value E(|Q|2) of the Q signal, and a cross-correlation value E(IQ) of the I signal and the Q signal;
calculating an estimate value Ân of a current amplitude imbalance calibration factor and an estimate value {circumflex over (P)}n of a current phase imbalance calibration factor as follows:
A
^
=
E

(

I

2
)
-
E

(

Q

2
)
2
×
E

(

Q

2
)


and


P
^
=
-
(
1
+
A
^
)
×
E

(
IQ
)
E

(

I

2
)
;
and
correcting the Q signal according to the Ân and {circumflex over (P)}n.

62 more elements

A device for correcting In-phase/Quadrature (IQ) imbalance of baseband signals in a wireless communication receiver, comprising:

a calculating unit configured to obtain an In-phase (I) signal and a Quadrature (Q) signal from a previous processing circuit, and calculate an autocorrelation value E(|I|2) of the I signal, an autocorrelation value E(|Q|2) of the Q signal, and a cross-correlation value E(IQ) of the I signal and the Q signal;
an estimating unit configured to calculate an estimate value Ân of a current amplitude imbalance calibration factor and an estimate value {circumflex over (P)}n of a current phase imbalance calibration factor as follows:
A
^
=
E

(

I

2
)
-
E

(

Q

2
)
2
×
E

(

Q

2
)


and


P
^
=
-
(
1
+
A
^
)
×
E

(
IQ
)
E

(

I

2
)
;
and
a first correcting unit configured to correct the Q signal according to the Ân and {circumflex over (P)}n.

61 more elements

Dependencies are inferred from the claim text.

Method and device for correcting iq imbalance of baseband signals in wireless communication receiver

Life of this patent

Method and device for correcting iq imbalance of baseband signals in wireless communication receiver

Life of this patent

Abstract

Claims10