KR20170083331A - Communication apparatus and method for correcting error thereof - Google Patents

Abstract

The present invention relates to a transmitter for converting an RF received signal into a second digital signal by generating a first digital signal and converting the RF signal into an RF (radio frequency) transmission signal and detecting an envelope component included in the RF transmission signal, Estimating the IQ imbalance and DC offset of the transmitter using the envelope component and using the second digital signal to estimate IQ imbalance and DC And an error estimator for estimating the offset.

Description

[0001] COMMUNICATION APPARATUS AND METHOD FOR CORRECTING ERROR THEREOF [0002]

An embodiment according to the concept of the present invention relates to a communication apparatus and an error correction method thereof.

An analog mixer may be used to convert a base band signal or an intermediate frequency signal to a radio frequency signal (UL), or to convert the RF signal into a baseband signal or an intermediate frequency signal (DL) is widely used in the field of wireless communication.

These analog mixers can cause IQ imbalance (in-phase and quadrature imbalance). IQ imbalance is defined as the gain imbalance in which the magnitudes of the in-phase signal and the quadrature signal do not coincide with each other and the phase difference between the in-phase signal and the quadrature signal Lt; RTI ID = 0.0 > 90. ≪ / RTI >

In addition, the analog mixer can generate a DC offset. The DC offset is generated by an LO signal generated from a local oscillator leaking to the output terminal of the transmission analog mixer or a reception analog mixer receiving an input signal including a DC signal generates an output signal including an LO signal component . The DC component (DC offset) corresponding to the product of the LO signal leaked to the input of the receiving analog mixer and the LO signal delivered from the local oscillator to the analog mixer is output from the receiving analog mixer.

If an IQ imbalance occurs, unnecessary noise is mixed in the signal, resulting in performance degradation of the communication device. If DC offset occurs, the power of the signal can be distributed to the carrier signal.

In order to solve these problems, a repetitive lattice algorithm correction method is mainly used. The lattice algorithm calibration method sequentially corrects error values through an iterative calibration process, but requires a large number of iterations to find an error value.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method and apparatus for estimating IQ imbalance and DC offset generated in a transmitting / receiving analog mixer by using a simple formula without a lot of repetitive arithmetic operations and using the estimated IQ imbalance component and DC offset component, A communication apparatus for correcting an RF received signal, and an error correction method therefor.

A communication apparatus according to an exemplary embodiment of the present invention includes a transmitter that generates a first digital signal and converts the RF signal into an RF (radio frequency) transmission signal, detects an envelope component included in the RF transmission signal, Estimating an IQ imbalance and a DC offset of the transmitter using the envelope component and using the second digital signal to estimate an IQ imbalance and a DC offset of the transmitter using the envelope component, And an error estimator for estimating an IQ imbalance and a DC offset of the receiver.

According to an embodiment of the present invention, the transmitter comprises: a transmission signal generator for generating the first digital signal of a first frequency; a gain controller for adjusting the size of the first digital signal; An envelope detector for detecting the envelope component included in the RF transmission signal; a transmission unit for correcting the first digital signal using the IQ imbalance and the DC offset received from the error estimator; And a correction unit.

According to an embodiment of the present invention, the communication apparatus may further include a signal level measurer that measures a signal level of the envelope component and transmits a first control signal to the gain controller when the signal level is smaller than or greater than a preset reference level, The gain control unit may adjust the size of the first digital signal according to the first control signal.

According to an embodiment, the receiver comprises: an RF receiver for converting an RF received signal of a second frequency received from the receive antenna module into a second digital signal; And a reception correction section for correcting the digital signal.

According to an embodiment, the communication apparatus may further include a signal level meter for measuring a signal level of the RF received signal and transmitting a second control signal to the RF receiver if the signal level is smaller than or greater than a predetermined reference level , The RF receiver may adjust the level of the RF received signal according to the control information.

According to an embodiment, the communication device may further comprise a reference signal generator for generating a reference signal having a frequency which is one of n (n is a natural number) times the frequency of the RF transmission signal and the frequency of the RF reception signal have.

An error estimator for estimating an error using the envelope component according to another embodiment of the present invention and a transmitter for detecting the envelope component of the RF transmission signal and correcting the RF transmission signal based on the estimated error A method for correcting errors in a communication apparatus, the method comprising the steps of: generating a first digital signal of a first frequency; converting the first digital signal into an RF transmission signal; The method comprising the steps of: detecting an envelope component included in an RF transmit signal; estimating an IQ imbalance component and a DC offset component using the envelope component; And correcting the first digital signal using the second digital signal.

According to an embodiment, the estimating step estimates the IQ imbalance component by using a DC component obtained by multiplying the envelope component by a reference signal of a second frequency, and the second frequency is estimated to be twice as high as the first frequency Size.

According to an embodiment, the estimating step may estimate the DC offset component using a DC component obtained by multiplying the envelope component by the reference signal of the first frequency.

The error correction method of a communication apparatus including an error estimator for estimating an error included in an RF reception signal of a first frequency according to another embodiment of the present invention and a receiver for correcting the RF transmission signal based on the estimated error, Wherein the receiving unit converts the RF received signal to a second digital signal, the error estimator estimating the IQ imbalance component and the DC offset component using the second digital signal, And correcting the second digital signal using the IQ imbalance component and the DC offset component.

According to an embodiment, the estimating step may estimate the DC offset component by averaging each of an in-phase signal and a quadrature signal.

According to an embodiment, the estimating step estimates the IQ imbalance component using a real value and an image value of the second digital signal, a real value and an image value of the reference signal, Frequency.

According to the communication apparatus and the error correction method thereof according to the embodiment of the present invention, it is possible to estimate the IQ imbalance and the DC offset generated in the transmitter and the receiver by a simple formula, and use the estimated IQ imbalance component and the DC offset component An ideal RF transmission signal and an RF reception signal without error can be obtained.

1 is a schematic conception diagram of a communication apparatus according to an embodiment of the present invention.
2 is a schematic block diagram of the transmitter, error estimator, reference signal generator, and signal level meter shown in FIG.
3 is a schematic conceptual diagram of the error estimator shown in FIG.
FIG. 4 is a schematic conceptual diagram of the transmission correction unit shown in FIG. 2. FIG.
5 is a schematic block diagram of the receiver, error estimator and reference signal generator shown in FIG.
6 is a schematic conceptual diagram of the error estimator shown in FIG.
7 is a schematic conceptual diagram of the reception correction unit shown in FIG.
8 is a flowchart for explaining a method of correcting an error included in an RF transmission signal.
9 is a flowchart for explaining a method of correcting an error included in an RF received signal.

It is to be understood that the specific structural or functional description of embodiments of the present invention disclosed herein is for illustrative purposes only and is not intended to limit the scope of the inventive concept But may be embodied in many different forms and is not limited to the embodiments set forth herein.

The embodiments according to the concept of the present invention can make various changes and can take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element may be referred to as a second element, The component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are used to specify that there are features, numbers, steps, operations, elements, parts or combinations thereof described herein, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached hereto.

1 is a schematic conception diagram of a communication apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a communication device 10 may include a transmitter 100, a receiver 200, an error estimator 300, a reference signal generator 400, and a signal level meter 500.

The transmitter 100 may generate an RF transmit signal A_TX1 and may transmit an RF transmit signal to another communications device external to the communications device 10. [

The transmitter 100 transmits an envelope component included in the RF transmit signal A_TX1 to eliminate the in-phase and quadrature imbalance and the DC offset included in the RF transmit signal A_TX1 E (t)).

The transmitter 100 may send the envelope component E (t) to the error estimator 300. The transmitter 100 can generate the corrected RF transmit signal A_TX1 'using the estimated IQ imbalance components a and beta and the DC offset components d _I and d _R received from the error estimator 300 have.

The receiver 200 can receive an RF receive signal A_TX2 from the outside.

The receiver 200 transmits the real value Real and the image value Imag of the RF received signal A_TX2 to the error estimator 300 in order to eliminate the IQ imbalance and the DC offset included in the RF received signal A_TX2 . The receiver 200 uses the estimated IQ imbalance components (α 'and β') and the DC offset components (d _I 'and d _R ') received from the error estimator 300 to calculate an error-free RF received signal A_TX2 .

The error estimator 300 uses the envelope component received from the transmitter 100 and the reference signal Ref to calculate IQ imbalance components a and beta and DC offset components d _I and d _{R of} the RF transmit signal A_TX1, Can be calculated.

The error estimator 300 also uses the real value, the image value, and the reference signal Ref received from the receiver 200 to calculate the IQ unbalance components? 'And?' Of the RF received signal A_TX2 and the DC offset The components (d _I 'and d _R ') can be calculated.

The reference signal generator 400 may generate a reference signal Ref necessary to obtain an IQ imbalance component and a DC offset component.

At this time, the reference signal Ref may be multiplied by n (n is a natural number) times of any one of the RF transmission signal A_TX1 and the RF reception signal A_TX2. For example, the reference signal generator 400 may generate a test tone having a frequency that is one or two times the envelope component E (t).

The signal level measurer 500 measures a voltage level of the envelope component E (t) or the real value and the image value, and outputs a first control signal PI1 and a second control signal PI2 Can be generated.

FIG. 2 is a schematic block diagram of the transmitter, the error estimator, the reference signal generator, and the signal level meter shown in FIG. 1, FIG. 3 is a schematic conceptual view of the error estimator shown in FIG. 2, 1 is a schematic conceptual diagram of the transmission correction unit shown in FIG.

2, a transmitter 100 according to an embodiment of the present invention includes a transmission signal generator 110, a gain controller 120, an RF transmitter 130, a transmission antenna 140, a transmission corrector 150, And an envelope detection unit 160. The envelope detection unit 160 detects the envelope.

The transmission signal generating unit 110 may generate the first digital signal D_TX1 of the first frequency. For example, the transmission signal generator 110 may generate a test tone of a specific frequency to correct an error.

The gain control unit 120 may adjust the size of the first digital signal D_TX1. That is, the gain control unit 120 can adjust the size of the first digital signal D_TX1 according to the IQ unbalance components? And? And the DC offset components d _I and d _R received from the error estimator 300 .

The RF transmitter 130 may convert the first digital signal D_TX1 into an RF transmit signal A_TX1. For example, the RF transmitter 130 may include an up-converter IQ mixer. The RF transmitting unit 130 may transmit the RF transmitting signal A_TX1 to the outside through the transmitting antenna unit 140. [

The transmission correction unit 150 can previously correct the error of the RF transmission signal A_TX1 using the IQ unbalance components? And? And the DC offset components d _I and d _R received from the error estimator 300 have. That is, the transmission correction unit 150 can correct the first digital signal D_TX1 using the IQ unbalance components? And? And the DC offset components d _I and d _R.

Thus, by the corrected first digital signal D_TX1 ', the newly generated RF transmission signal A_TX1' does not include the IQ unbalance components alpha and beta and the DC offset components d _I and d _R It can be converted into an ideal signal.

The envelope detection unit 160 serves to detect the envelope component E (t) included in the RF transmission signal A_TX1. The RF transmission signal A_TX1 that has passed through the RF transmission unit 130 of the transmitter 100 has a high carrier frequency. At this time, the envelope detector 160 can remove the high carrier frequency signal by the filter and detect only the envelope component E (t) of the baseband signal.

The envelope detector 160 may send the envelope component E (t) to the error estimator 300.

The error estimator 300 may estimate the IQ unbalance components alpha and beta and the DC offset components d _I and d _R using the envelope component E (t) and the reference signal Ref.

The reference signal generator 400 may generate the reference signal Ref to estimate the IQ unbalance components? And? Included in the RF transmit signal A_TX1 and the DC offset components d _I and d _R. The reference signal generator 400 can generate a reference signal Ref having a frequency that is one or two times the frequency of the RF transmit signal A_TX1.

At this time, the reference signal Ref has a phase coinciding with the RF transmission signal A_TX1.

For example, the reference signal generator 400 may perform a process of finding a minimum phase difference from the RF transmission signal by shifting the generated reference signal by one clock. At this time, the reference signal having the minimum phase difference may be selected, and the selected reference signal Ref may be transmitted to the error estimator 300.

The signal level measurer 500 can generate a control signal so that the magnitude of the signal can be maintained at an appropriate level.

For example, the signal level measurer 500 may measure the level of the envelope component E (t) and generate the first control signal PI1 so that the envelope component E (t) can be generated at an appropriate level .

If the level of the envelope component E (t) received by the signal level measurer 500 is too large or too small compared to the actual transmitted signal, the IQ imbalance components? And? And the DC offset components (d _I and d _R ) can not be estimated, or a more accurate estimation can be made.

Therefore, the signal level measurer 500 measures the voltage level of the envelope component E (t), and when the voltage level is smaller than or greater than a predetermined reference level, the gain control unit 120 outputs the first control signal PI1 Lt; / RTI > At this time, the gain control unit 120 may adjust the magnitude of the first digital signal D_TX1 to an appropriate level according to the received first control signal PI1.

3, the error estimator 300 calculates IQ imbalance components? And? And a DC offset component (?) Using the envelope component E (t) received from the envelope detector 160 and the reference signal Ref d _I and d _R ).

The envelope component E (t) received from the envelope detection unit 160 can be obtained according to the following equation.

(T) is an IQ non-uniform component included in the envelope component E (t), d _I and d _R are DC offset components, and ω _s Is the angular frequency of the RF transmit signal A_TX1.

The selectors 310 and 320 select one of the reference signal Ref1 of the first frequency and the reference signal Ref2 of the second frequency according to the selection signal DCIQ_sel and supply the selected signal to the multipliers 330 and 360 .

At this time, the reference signal Ref1 of the first frequency and the reference signal Ref2 of the second frequency can be expressed by the following equations.

Ref1 = cos (? _S t) + j sin (? _S t)))

Ref 2 = cos (2? _S t) + j sin (2? _S t)))

Further, the filters 340, 350, 370, and 380 can remove other factors, such as noise, etc., in order to leave only DC components.

The error estimator 300 estimates the envelope component E (t) to separate the DC offset components d _I and d _R from the IQ non-uniformity components alpha and beta included in the envelope component E (t) Can be multiplied by the reference signal signal Ref.

The error estimator 300 multiplies the envelope component E (t) by the first frequency reference signal Ref1 and outputs only the DC components E _R and E _I through the filters 340, 350, 370 and 380 Can be extracted. At this time, the error estimator 300 may estimate the IQ unbalance components? And? Using the extracted DC components E _R and E _I.

Thus, the method by which the error estimator 300 estimates the IQ unbalance components? And? Can be calculated by the following equations.

The error estimator 300 may transmit the IQ unbalance components? And? Obtained by the above equations to the transmission correction unit 150. [

The error estimator 300 also multiplies the envelope component E (t) by the reference signal Ref1 of the first frequency and outputs the DC components E _R and E _I (t) through the filters 340, 350, 370 and 380, ) Can be extracted. At this time, the error estimator 300 may estimate the DC offset components d _R and d _I using the extracted DC components E _R and E _I.

Thus, the manner in which the error estimator 300 estimates the DC offset components d _R and d _I can be calculated by the following equations. At this time, the previously obtained IQ unbalance components (alpha and beta) can be used to obtain the DC offset components d _R and d _I.

The error estimator 300 may transmit the DC offset components d _R and d _I obtained by the above equations to the transmission correction unit 150.

4, the transmission correction section 150 IQ imbalance components (α and β) and a DC offset component (d _R and d _I), a, a-corrected by correcting the first data signal (D_TX1) of claim 1 using The data signal D_TX1 'can be generated.

The first data signal D_TX1 and the corrected first data signal D_TX1 'can be expressed by the following equations.

D_TX1 = cos (? _S t) + j sin (? _S t)

D_TX1 '= (1 + α) cos (ω s t) + βsin (ω s t) -d R + j (sin (ω s t) -d I)

That is, the transmission correcting unit 150 comprises a first data signal (D_TX1), IQ imbalance components (α and β), and a DC offset component of the (d _R and d _I), a multiplier based on the (151 and 152) and adder The first data signal D_TX1 'may be generated using the correction data 153, 154, 155, and 156.

When the corrected data signal D_TX1 'is supplied to the RF transmitter 130, the RF transmitter 130 generates the IQ imbalance components? And?, And the DC offset component d (d) based on the corrected data signal D_TX1' _R and d _I ). & Lt _{; / RTI} >

FIG. 5 is a schematic block diagram of the receiver, the error estimator and the reference signal generator shown in FIG. 1, FIG. 6 is a schematic conceptual diagram of the error estimator shown in FIG. 5, Fig.

Referring to FIG. 5, a receiver 200 according to an embodiment of the present invention includes a reception antenna unit 210, an RF reception unit 220, and a reception correction unit 230.

The RF receiving unit 220 may convert the RF receiving signal A_TX2 of the second frequency received from the receiving antenna unit 210 into the second digital signal D_TX2. The RF receiving unit 220 may transmit the real value Real and the image value Imag of the second digital signal D_TX2 to the error estimator 300. [

The error estimator 300 reflects the reference signal Ref to the real value Real and the image value Imag of the second digital signal D_TX2 to calculate the IQ unbalance components? 'And?', And the DC offset component d _R 'and d _I ').

Receiving corrector 230 may correct the second digital signal (D_TX2) using the IQ imbalance component (α 'and β'), and a DC offset component (d _R 'd and _I'). Accordingly, the reception correction unit 230 can receive an error-free RF reception signal using the corrected second digital signal D_TX2.

Referring to FIG. 6, the error estimator 300 calculates (α 'and β') and DC offset component (d _R ') using the real value Real and the image value Imag of the second digital signal D_TX2, And d _I ').

In addition, the error estimator 300 can obtain the real value (Real) and the image value (Imag) of the second digital signal (D_TX2) using the following equation.

Where Im is the image value Imag, the a 'is the gain imbalance, the beta' is the phase imbalance, the θ is the real value of the second digital signal D_TX2, (100) and the receiver (200).

First, the error estimator 300 may estimate the DC offset components d _R 'and d _I ' by averaging each of the in-phase signal and the quadrature signal.

The error estimator 300 reflects the reference signal Ref through the multipliers 330, 332, 334 and 336 to the real value Imag and the filters 340, 342, 344, 346, using a 350, 352, 354, and 356), the first result (E _{Rcos (ωst)),} the second result value (E _{Rsin (ωst)),} the third result value (E _{Icos (ωst)} ), And a fourth result value (E _{Isin (? St)} ).

Here, the reference signal Ref can be expressed by the following equation.

Ref = cos (? _S t) + j sin (? _S t)

Specifically, the error estimator 300 may calculate the first result value E _{Rcos (? St)} by multiplying the real value Real by the real value of the reference signal Ref. The first result value (E _{Rcos (? St)} ) can be expressed by the following equation.

Also, the error estimator 300 may calculate the second result value E _{R sin (? St)} by multiplying the image value of the reference signal Ref by the real value Real. The second result value (E _{R sin (? St)} ) can be expressed by the following equation.

In addition, the error estimator 300 may calculate the third result E I _cos ( _{? St)} by multiplying the image value Imag by the real value of the reference signal Ref. The third result value (E _{Icos (? St)} ) can be expressed by the following equation.

Further, the error estimator 300 may calculate the fourth result value E _{Isin (? St)} by multiplying the image value Imag by the image value of the reference signal Ref. The fourth result value (E _{Isin (? St)} ) can be expressed by the following equation.

The error estimator 300 may send the estimated IQ unbalance components (α 'and β') and the DC offset components (d _R 'and d _I ') to the receive correction unit 230. That is, the error estimator 300 calculates a first result value E _{Rcos (? St )} including the IQ unbalance components? 'And?', A second result value E _{R sin (? St )} E I _{cos ( ? St )} ) and the fourth result value E _{Isin (? St} ) to the reception correction unit 230.

7, the reception correction unit 230 receives the DC offset components d _R 'and d _I ' and the first result value E _{Rcos ( ω st )} including the IQ imbalance components α 'and β' ) To the fourth resultant value E _{Isin (? St)} , the second data signal D_TX2 can be corrected.

At this time, the reception correction unit 230 adds the DC offset components d _R (d _R ) to the second data signal D_TX2 through the multipliers 232, 234, 235, and 237 and the adders 231, 233, 236, 'And d _I ') and the first resultant value E _{Rcos ( ω st )} to the fourth resultant value E _{Isin (ω st} ) to the second data signal D_TX2.

The corrected second data signal D_TX2 'can be represented by the following equation.

D_TX2 '= (1 + α' ) cos (ω s t) + j ((1 + α ') sin (ω s t))

Although the IQ imbalances (α 'and β') and the DC offsets (d _R 'and d _I ') are generated when the RF receiving section 220 converts the RF receiving signal A_TX2 into the second digital signal D_TX2 , The reception correction unit 230 may generate the corrected second data signal D_TX2 'to eliminate the error.

8 is a flowchart for explaining a method of correcting an error included in an RF transmission signal.

8, a communication apparatus 10 according to an embodiment of the present invention includes an error estimator 300 for estimating an error using an envelope component E (t), and an error estimator 300 for estimating an error of the envelope of the RF transmission signal A_TX1 And a transmitter 100 for detecting the component E (t) and correcting the RF transmit signal A_TX1 based on the estimated error.

The transmitter 100 generates a first digital signal D_TX1 of a first frequency (S100) and converts the first digital signal into an RF transmission signal A_TX1 (S110).

The transmitter 100 may detect the envelope component E (t) included in the RF transmission signal A_TX1 (S120).

The error estimator 300 may estimate the IQ unbalance components alpha and beta and the DC offset components d _R and d _I using the envelope component E (t) (S130).

At this time, the transmitter 100 may obtain the DC component by multiplying the envelope component E (t) by the reference signal Ref of the second frequency, which is twice the first frequency. The transmitter 100 may estimate the IQ imbalance components alpha and beta using the DC component.

Further, the transmitter 100 may obtain the DC component by multiplying the envelope component E (t) by the reference signal Ref. The transmitter 100 may estimate the DC offset components d _R and d _I using the DC component.

The transmitter 100 may correct the first digital signal using the IQ imbalance components alpha and beta and the DC offset components d _R and d _I at step S140.

9 is a flowchart for explaining a method of correcting an error included in an RF received signal.

9, a communication apparatus 10 according to an exemplary embodiment of the present invention includes an error estimator 300 that estimates an error included in an RF received signal A_TX2 of a first frequency, And a receiver 200 for correcting the signal A_TX2.

The receiver 200 may convert the RF received signal A_TX2 into a second digital signal D_TX2 (S200).

Error estimator 300 may estimate the IQ imbalance component of claim 2 by using a digital signal (D_TX2) (α 'and β') and a DC offset component _(R d ', and _I d') (S210).

At this time, the error estimator 300 may estimate the DC offset components d _R 'and d _I ' by averaging each of the in-phase signal and the quadrature signal.

The error estimator 300 calculates the IQ imbalance components? 'And?' Using the real value and the image value Imag of the second digital signal D_TX2 and the real and image values of the reference signal Ref, beta ') can be estimated.

The receiving unit may correct the second digital signal D_TX2 using the IQ unbalance components (α 'and β') and the DC offset components (d _R 'and d _I ') (S220).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: communication device 100: transmitter
110: Transmission signal generator 120: Gain controller
130: RF transmitting unit 140: transmitting antenna unit
150: transmission correction unit 160: envelope detection unit
200: receiver 210: receiving antenna unit
220: RF receiving unit 230:
300: error estimator 400: reference signal generator
500: Signal level meter

Claims (16)

A transmitter for generating and converting a first digital signal into a radio frequency (RF) transmission signal and detecting an envelope component included in the RF transmission signal;
A receiver for converting the RF received signal into a second digital signal; And
Estimating an IQ imbalance and a DC offset of the transmitter using the envelope component and estimating an IQ imbalance and a DC offset of the receiver using the second digital signal; The error estimator comprising: 2. The apparatus of claim 1,
A transmission signal generator for generating the first digital signal of a first frequency;
A gain controller for adjusting a magnitude of the first digital signal;
An RF transmitter for converting the first digital signal into the RF transmission signal;
An envelope detector for detecting the envelope component included in the RF transmission signal; And
And a transmission corrector for correcting the first digital signal using the IQ imbalance and the DC offset received from the error estimator. 3. The method of claim 2,
And a signal level measurer for measuring a signal level of the envelope component and transmitting a first control signal to the gain controller if the signal level is smaller than or greater than a predetermined reference level,
And the gain control unit adjusts the size of the first digital signal according to the first control signal. 2. The receiver of claim 1,
An RF receiver for converting an RF received signal of a second frequency received from the receiving antenna module into a second digital signal; And
And a reception corrector for correcting the second digital signal using a second correction value received from the error estimator. 5. The method of claim 4,
And a signal level meter for measuring a signal level of the RF received signal and transmitting a second control signal to the RF receiver if the signal level is smaller than or greater than a predetermined reference level,
And the RF receiver adjusts the level of the RF received signal according to the control information. The method according to claim 1,
Further comprising a reference signal generator for generating a reference signal having a frequency that is one of n (n is a natural number) times the frequency of the RF transmission signal and the frequency of the RF reception signal. An error estimator for estimating an error using the envelope component and a transmitter for detecting the envelope component of the RF transmission signal and correcting the RF transmission signal based on the estimated error, ,
The transmitter generating a first digital signal of a first frequency;
The transmitter converting the first digital signal into an RF transmission signal;
The transmitter detecting an envelope component included in the RF transmission signal;
The error estimator estimating an IQ imbalance component and a DC offset component using the envelope component;
Wherein the transmitter corrects the first digital signal using the IQ imbalance component and the DC offset component. 8. The method of claim 7,

The envelope component is detected using the above equation,
Where d _I and d _R are the DC offset components and? _S is the angular frequency of the RF transmit signal, wherein? (T) is an envelope component,? And? Are the IQ non-homogeneous component, A method for correcting errors in a device. 9. The method of claim 8,
Estimating the IQ imbalance component by using a DC component obtained by multiplying the envelope component by a reference signal of a second frequency,
Wherein the second frequency has a magnitude twice that of the first frequency. 10. The method of claim 9,

Estimating the IQ imbalance component using the equations,
Wherein the cos (2ω _s t) is a real value of the reference signal, and the sin (2ω _s t) is an image value of the reference signal. 9. The method of claim 8,
And estimating the DC offset component using a DC component obtained by multiplying the envelope component by a reference signal of the first frequency. 12. The method of claim 11,

Estimates the DC offset using the equations,
Wherein the cos (ω _s t) is a real value of the reference signal, and the sin (ω _s t) is an image value of the reference signal. An error correction method of a communication apparatus, comprising: an error estimator for estimating an error included in an RF received signal of a first frequency; and a receiver for correcting the RF transmission signal based on an estimated error,
Converting the RF received signal into a second digital signal;
The error estimator estimating the IQ imbalance component and the DC offset component using the second digital signal; And
And the receiver corrects the second digital signal using the IQ imbalance component and the DC offset component. 14. The method of claim 13,
And estimating the DC offset component by averaging each of an in-phase signal and a quadrature signal. 14. The method of claim 13,
Estimates the IQ imbalance component using a real value and an image value of the second digital signal, a real value and an image value of the reference signal,
Wherein the reference signal is the first frequency. 16. The method of claim 15,

Estimating the IQ imbalance component using the equations,
Wherein the real is the real value of the second data signal, the Imag is the image value of the second data signal, the a 'is the gain unbalance, the beta' is the phase imbalance, A method for correcting error of a communication device, the difference being a frequency phase difference of a receiver.

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