KR20090111031A - Interference cancellation module capable of automatic gain control adaptively, radio repeater, and method thereof - Google Patents

Abstract

PURPOSE: An interference removal module, a wireless repeater, and a method thereof even through the input signal is changed by external environment are provided to control an automatic gain even though the input signal value is changed according to the external environment. CONSTITUTION: A wireless repeater(10) includes an antenna(11), a second antenna(51), and a signal processing unit. The first antenna transmits and receives wireless signal from a base station. The second antenna transmits and receives wireless signal. The signal processing unit processes and receives the analog signal received through the antenna. The transmission signal is transmitted through the antenna.

Description

Interference cancellation module capable of automatic gain control adaptively, radio repeater, and method

The present invention relates to an interference signal cancellation technology in a wireless repeater, and more particularly, to an interference cancellation module, a wireless repeater, and a method of adaptively adjusting automatic gain.

In general, the repeater is a device that is located in a place where the radio wave between the base station and the terminal is weak or not reachable to provide a good signal to the area to enable the corresponding service.

For example, the repeater is located between the base station and the terminal to convert the weak signal generated from the base station into a good signal to transmit to the terminal (hereinafter referred to as 'forward transmission' or 'downward transmission'), or The weak signal generated from the terminal may be converted into a good signal and transmitted to the base station (hereinafter referred to as 'reverse transmission' or 'upward transmission').

Types of repeaters include microwave repeaters, RF repeaters, optical repeaters, and interference suppression repeaters. Among them, the interference cancellation repeater (ICS) has recently been used in buildings and urban areas with poor wireless environments. An apparatus that plays an important role in ensuring stable service refers to a repeater that removes feedback signals generated due to lack of isolation of transmit and receive antennas in the forward and reverse transmissions.

In general, the interference elimination repeater amplifies the received input signal and removes the feedback signal from the amplified signal.

However, the input signal received by the interference elimination repeater is greatly changed instantaneously according to an external environment (for example, a multi-path fading environment), and thus is adapted to the external environment changed during signal processing of the input signal. There is a need for a repeater capable of adaptive automatic gain control.

Accordingly, the technical problem to be achieved by the present invention is to provide an interference cancellation module capable of adaptive automatic gain control during signal processing, a wireless repeater including the interference cancellation module, and a method thereof.

In order to achieve the above technical problem, an adaptive automatic gain control wireless repeater includes: a first antenna for transmitting and receiving a radio signal with a base station; A second antenna for transmitting and receiving a wireless signal with the terminal; A signal processor for receiving and processing an analog signal received through any one of the first antenna and the second antenna and converts it into a signal for transmission through the other one of the first antenna and the second antenna It may include.

The signal processor removes an interference signal included in an analog signal received through the one antenna, and generates and generates an automatic gain control signal based on the magnitude of the analog signal to the analog-digital converted digital signal. In response to the automatic gain control signal, it is possible to determine whether or not to amplify the signal generated when the analog signal is processed.

The signal processor may detect an envelope of the digital signal, compare the detected envelope with a corresponding magnitude and a predetermined reference value, and generate the auto gain control signal based on a comparison result.

The signal processor may analog-digital convert an analog signal received through the one antenna, amplify the analog-digital converted signal in response to the auto gain control signal, and remove the interference signal included in the amplified signal. The signal from which the interference signal is removed may be digitally-analog converted and output.

The signal processor may amplify the signal from which the interference signal has been removed in response to the auto gain control signal, convert the amplified signal into the digital-analog conversion, and output the digital-analog converted signal in response to the automatic gain control signal. Can be.

The signal processor may include: a first low noise amplifier configured to low noise amplify an analog signal received through the one antenna and output a low noise amplified signal; Analog-to-digital conversion of the signal output from the first low noise amplifier, amplifying the analog-to-digital converted signal in response to the automatic gain control signal, remove the interference signal included in the amplified signal and the interference signal is removed An interference signal cancellation module for digitally-analog converting and outputting a signal; And a second low noise amplifier for low noise amplifying the signal output from the interference signal removing module and transmitting the low noise amplified signal through the other antenna.

The interference signal removal module may include an analog-digital converter configured to analog-digital convert the amplified analog signal output from the first low noise amplifier and output an analog-digital converted signal; A first auto gain amplifier for amplifying the output signal of the analog-to-digital converter and outputting the amplified signal in response to the auto gain control signal; An interference signal removal unit for removing the interference signal from the output signal of the first automatic gain amplifier and outputting a signal from which the interference signal has been removed; A second automatic gain amplifier for amplifying the output signal of the interference signal canceller and outputting the amplified signal in response to the automatic gain control signal; A digital-analog converter configured to digital-analog convert the signal amplified by the second auto gain amplifier and output a digital-analog converted signal; And an automatic gain controller configured to generate the automatic gain control signal based on the output signal of the analog-digital converter and output the generated automatic gain control signal to the first automatic gain amplifier and the second automatic gain amplifier. have.

The automatic gain control unit includes: an envelope detection unit detecting an envelope of an output signal of the analog-to-digital converter and outputting a detection result; And a comparator for comparing the value corresponding to the size of the envelope detected by the envelope detector with a predetermined reference value and outputting the automatic gain control signal based on a comparison result.

The envelope detector may include: an absolute value calculator for calculating an absolute value of an output of the analog-to-digital converter and outputting a calculation result; A first multiplier for multiplying a first gain to an output value of the absolute value calculating unit and outputting a multiplied result; And a low pass filter configured to low pass filter the output of the first multiplier and output a low pass filtered result to the comparator.

The low pass filter unit includes: an adder for adding the output of the absolute value calculating unit and the feedbacked output signal and outputting an addition result; A delayer for delaying the output of the adder by a predetermined time and outputting a delayed signal; And a second multiplier that multiplies a second gain to the output signal of the delayer and outputs the multiplied result as the feedbacked output signal.

In order to accomplish the above technical problem, an interference-free signal removal module capable of automatically adjusting the gain includes: an analog-digital converter for analog-to-digital converting an analog signal including an interference signal and outputting an analog-digital converted signal; A first auto gain amplifier for amplifying an output signal of the analog-to-digital converter and outputting the amplified signal in response to an auto gain control signal; An interference signal removing unit which removes the interference signal from the output signal of the first automatic gain amplifier and outputs a signal from which the interference signal has been removed; A second automatic gain amplifier for amplifying the output signal of the interference signal canceller and outputting the amplified signal in response to the automatic gain control signal; A digital-analog converter configured to digital-analog convert an output signal of the second auto gain amplifier and output a digital-analog converted signal; And detecting an envelope of an output signal of the analog-to-digital converter, comparing a value corresponding to a magnitude of the detected envelope with a predetermined reference value, and comparing the auto gain control signal with the first auto gain amplifier and the first based on a comparison result. 2 may include an automatic gain control unit for outputting to the automatic gain amplifier.

The automatic gain control unit includes: an envelope detection unit detecting the envelope of the signal output from the analog-digital converter and outputting a detection result; And a comparator for comparing the value corresponding to the size of the envelope detected by the envelope detector with the predetermined reference value and outputting the automatic gain control signal based on a comparison result.

The envelope detector may include: an absolute value calculator for calculating an absolute value of an output of the analog-to-digital converter and outputting a calculation result; A first multiplier for multiplying a first gain to an output value of the absolute value calculating unit and outputting a multiplied result; And a low pass filter configured to low pass filter the output of the first multiplier and output a low pass filtered result to the comparator.

The low pass filter unit includes: an adder for adding the output of the absolute value calculating unit and the feedbacked output signal and outputting an addition result; A delayer for delaying the output of the adder by a predetermined time and outputting a delayed signal; And a second multiplier that multiplies a second gain to the output signal of the delayer and outputs the multiplied result as the feedbacked output signal.

In order to achieve the above technical problem, a wireless signal relay method capable of adaptive automatic gain adjustment may include: receiving an analog signal including an interference signal through an antenna; Generating an automatic gain control signal based on the magnitude of the digital signal obtained by analog-to-digital conversion of the analog signal; And amplifying a signal generated when the analog signal is processed and removing the interference signal in response to the auto gain control signal.

The generating of the auto gain control signal may include: outputting the digital signal by analog-to-digital converting the analog signal; And detecting an envelope of the digital signal, comparing a value corresponding to the detected envelope with a predetermined reference value, and generating the automatic gain control signal based on a comparison result.

The adaptively adjustable wireless signal relay method may be stored in a recordable recording medium for executing the relay method.

As described above, the interference canceling module, the wireless repeater, and the method according to the present invention have the effect of adaptive automatic gain adjustment even if the input signal value changes according to the external environment.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram of a wireless repeater according to an exemplary embodiment of the present invention, and FIG. 2 is a block diagram of the automatic gain control unit of FIG. 1. 1 and 2, the wireless repeater 10 includes a first antenna 11, a first duplexer 13, a down-unit, a down-unit, an up-unit, and a second duplexer. 31, and a second antenna 51.

The wireless repeater 10 is located between the base station (not shown) and the terminal (not shown) to receive the weak signal generated by the base station through the first antenna 11 and receive the received first analog signal Vr1. Transmit the converted second analog signal Vr11 to the terminal through the second antenna 51 by converting the signal into a good signal (for example, a signal that has been eliminated by interference or noise) (hereinafter, 'forward transmission' or 'downward'). Transfer. ').

In addition, the wireless repeater 10 receives the third analog signal Vr22 generated from the terminal through the second antenna 51 and converts the received signal into a good signal (for example, a signal in which interference or noise is removed and amplified). The fourth analog signal Vr2 may be converted to and transmitted to the base station through the first antenna 11 (hereinafter, referred to as 'reverse transmission' or 'upward transmission').

The wireless repeater 10 may be an interference cancellation system (ICS) and may use a time division duplex (TDD) method, a global system for mobile telecommunication (GSM) method, or a wideband code division multiple access (WCDMA) method. have.

The first antenna 11 may transmit and receive radio signals Vr1 and Vr2 with a base station (not shown).

The first duplexer 13 may forward (or induce) the first analog signal Vr1 received through the first antenna 11 to the down-unit in a forward direction, and the uplink signal processor ( The third analog signal Vr22 received from the up-unit may be transmitted (or induced) in the reverse direction to the first antenna 11.

The down-signal unit receives the first analog signal Vr1 including the first interference signal through the first antenna 11 and processes the received first analog signal Vr1 to process the second antenna ( 51 may be converted into a second analog signal Vr11 for transmission.

The first interference signal may be a feedback signal in which a signal output through the second antenna 51 is directly or reflected and input to the first antenna 11.

The down-signal unit removes the first interference signal included in the first analog signal Vr1 received through the first antenna 11, and the first analog signal Vr1 converts the analog-digital signal. The first automatic gain control signal AG-sgn1 is generated based on the magnitude of the first digital signal D-sgn1 and the first analog signal is generated based on the generated first automatic gain control signal AG-sgn1. The signal generated during the processing of (Vr1) can be amplified.

The down-signal processing unit may include a first low noise amplifier 15, a first interference signal cancellation module 16, and a second low noise amplifier 29.

The first low noise amplifier 15 receives the first analog signal Vr1 including the first interference signal output from the base station through the first antenna 11 to low noise amplify and remove the low noise amplified signal from the first interference signal. Output to module 16 may be possible.

The first interference signal removal module 16 may remove the first interference signal from the signal output from the first low noise amplifier 15 and output a signal from which the first interference signal has been removed.

The first interference signal canceling module 16 includes a first analog-to-digital converter 17, a first automatic gain amplifier 19, a first automatic gain control unit 21, a first interference signal canceling unit 23, and a second Auto gain amplifier 25 and a first digital-to-analog converter 27.

The first analog-digital converter 17 may analog-digital convert the output signal of the first low noise amplifier 15 and output the analog-digital converted signal D-sgn1.

The first auto gain amplifier 19 outputs an output signal of the first analog-to-digital converter 17 based on the first auto gain control signal AG-sgn1 generated by the first auto gain control unit 21 to be described later. D-sgn1) can be amplified and the amplified signal can be output.

For example, the first auto gain amplifier 19 outputs the output signal D of the digital converter 17 in response to the first auto gain control signal AG-sgn1 in a first logic level (eg, a high '1' level). -sgn1) can be amplified by N (N is real) times automatic gain.

Alternatively, the first auto gain amplifier 19 may output the corresponding input signal without auto gain amplification in response to the first auto gain control signal AG-sgn1 having a second logic level (eg, a low '0' level) ( For example, gain "1" may be multiplied).

The first automatic gain control unit 21 may generate the automatic gain control signal AG-sgn1 based on the magnitude of the output signal D-sgn1 of the first analog-digital converter 17.

More specifically, the first automatic gain control unit 21 detects an envelope of the output signal D-sgn1 of the first analog-to-digital converter 17, and a value corresponding to the detected envelope size and a predetermined reference value. For example, the reference value Gref of FIG. 2 may be compared and the first automatic gain control signal AG- sgn1 may be generated based on the comparison result.

In this case, the first auto gain control signal AG-sgn1 may enable or disable operations of the first auto gain amplifier 19 and / or the second auto gain amplifier 25.

For example, when the value corresponding to the detected envelope is smaller than a predetermined reference value (eg, Gref of FIG. 2), the first automatic gain controller 21 may determine a first logic level (eg, a high '1' level). The first auto gain control signal AG-sgn1 may be generated.

At this time, the first auto gain amplifier 19 and / or the second auto gain amplifier 25 respond to the first auto gain control signal AG-sgn1 in a first logic level (eg, a high '1' level). The corresponding input signal can be amplified by N (N is real) times automatic gain.

In addition, when the value corresponding to the detected envelope is greater than a predetermined reference value (eg, Gref of FIG. 2), the first automatic gain controller 21 may determine a second logic level (eg, a low '0' level). The first auto gain control signal AG-sgn1 may be generated.

In this case, the first auto gain amplifier 19 and / or the second auto gain amplifier 25 may respond to the first auto gain control signal AG-sgn1 in a second logic level (eg, low 0 'level). The corresponding input signal can be output without auto gain amplification (eg, multiply gain "1").

In the above embodiment, when the value corresponding to the detected envelope is smaller than a predetermined reference value (eg, Gref of FIG. 2), the first automatic gain control unit 21 and / or A first auto gain control signal AG-sgn1 for enabling the operation of the second auto gain amplifier 25 is output.

Like the operation of the first automatic gain control unit 21 to be described later with reference to FIG. 3, the first automatic gain control unit 21 has a value corresponding to the detected envelope of a predetermined reference value (eg, Gref of FIG. 2). If larger, the first auto gain control signal AG-sgn1 may be output to enable the operation of the first auto gain amplifier 19 and / or the second auto gain amplifier 25.

Meanwhile, the first automatic gain controller 21 detects an envelope of the output signal D-sgn1 of the first analog-to-digital converter 17, and a value corresponding to the detected envelope size and predetermined reference values (not shown). ), Determine the magnitude of the detected envelope as one of a plurality of levels (not shown) based on the comparison result, and generate the first automatic gain control signal AG-sgn1 based on the determination result. You may.

In this case, the first auto gain control signal AG-sgn1 may be a P (P is a real number) bit, and the first auto gain amplifier 19 and / or the second auto gain amplifier 25 are P (P is a real number). The intensity of the input signal amplification may be adjusted in response to the first automatic gain control signal AG- sgn1 of the bit.

That is, the wireless repeater 10 according to the embodiment of the present invention adaptively adapts to the size of the detected envelope even if the input signal value changes according to an external environment (for example, a multi-path fading environment). (adaptive) Automatic gain adjustment is possible.

The first automatic gain control unit 21 may include an envelope detector 60 and a comparator 73. The envelope detector 60 may detect an envelope of the analog-digital converted signal output from the first analog-digital converter 17 and output a value Vp corresponding to the magnitude of the detected envelope.

The envelope detection unit 60 may include an absolute calculation unit 61, a first multiplier 63, and a low pass filter unit 65. The absolute calculation unit 61 may calculate an absolute value of the output signal of the first analog-to-digital converter 17 and output the calculation result.

For example, the absolute calculation unit 61 bit-wise inversions and bit-wise inverts the output signal when the output signal of the first analog-to-digital converter 17 has a negative value. You can print the converted value.

The first multiplier 63 multiplies the first gain value G1 to the output value of the absolute value calculating unit 61 and outputs the result of the multiply to the low pass filter unit 65, and the low pass filter unit 65. Low pass filtering of the output signal of the first multiplier 63 and outputs the result of the low pass filtering.

The low pass filter unit 65 may include an adder 67, a delayer 71, and a second multiplier 69. The adder 67 may add the output value of the absolute value calculating unit 61 and the feedbacked output signal Vf and output the addition result Vp.

The delay unit 71 may delay the output signal of the adder 67 by a predetermined time and output the delayed signal to the second multiplier 69, and the second multiplier 69 may be added to the output signal of the delay unit 71. The result of the multiplying and multiplying the two gain values G3 can be output as the feedbacked output signal Vf.

The first gain value G1 and the second gain value G3 may have different values, but may have the same value.

The comparator 73 compares a value corresponding to the size of the envelope detected by the envelope detector 60 (that is, the output value of the adder 67, Vp) with a predetermined reference value (Gref), and compares the result of the first automatic gain. It can output as the control signal AG-sgn1.

For example, the comparator 73 may determine the first logic level when the value corresponding to the magnitude of the detected envelope (that is, the output value of the adder 67, Vp) is smaller than a predetermined reference value (eg, Gref of FIG. 2). For example, the first automatic gain control signal AG-sgn1 in a high '1' level state may be generated.

In addition, the comparator 73 determines the second logic level when the value corresponding to the detected envelope size (that is, the output value of the adder 67, Vp) is larger than a predetermined reference value (eg, Gref of FIG. 2). For example, the first automatic gain control signal AG-sgn1 may be generated in a low '0' level state.

The first interference signal remover 23 may remove the first interference signal included in the output signal of the first automatic gain amplifier 19 and output a signal from which the first interference signal has been removed.

For example, the first interference signal canceling unit 23 detects replication of the output signal of the first interference signal and the output signal of the first automatic gain amplifier 19 and based on the simulation information corresponding to the detection result. The first interference signal may be estimated and removed from the output signal of the gain amplifier 19.

The simulation information is information representing the simplicity of the output signal of the first interference signal removing unit 23 and the output signal of the first automatic gain amplifier 19. The simulation information is the output signal of the first interference signal and the first automatic gain amplifier 19. It may include a simulation point (or common point) for the phase (Phase) and amplitude (Amplitude) according to the time (Time) of the output signal of the ().

For example, the first interference signal remover 23 has the same amplitude with respect to the estimated first interference signal and time, phase, and amplitude information, but the phases are opposite (that is, reverse phase). ) And generate the signal from which the first interference signal is removed by adding the generated signal to the output signal of the first automatic gain amplifier 19.

The second auto gain amplifier 25 amplifies the output signal of the first interference signal canceller 23 based on the first auto gain control signal AG-sgn1 and converts the amplified signal into the first digital-analog converter 27. Can be printed as

For example, the second auto gain amplifier 25 responds to the first auto gain control signal AG- sgn1 in a first logic level (eg, a high '1' level) and outputs a corresponding input signal N (n is a real value). It can multiply auto gain.

Alternatively, the second auto gain amplifier 25 may output the corresponding input signal without auto gain amplification in response to the first auto gain control signal AG-sgn1 having a second logic level (eg, low '0' level) ( For example, gain "1" may be multiplied).

The first digital-analog converter 27 may digital-analog convert the output signal of the second auto gain amplifier 25 to output the digital-analog converted signal.

The second low noise amplifier 29 may low noise amplify the output signal of the first digital-analog converter 27 and output the low noise amplified signal as the second analog signal Vr11.

The up-unit receives the third analog signal Vr22 including the second interference signal through the second antenna 51 and processes the received third analog signal Vr22 to process the first antenna. 11) it may be converted into a fourth analog signal Vr2 for transmission.

The second interference signal may be a feedback signal in which a signal transmitted through the first antenna 11 is directly or reflected and input to the second antenna 51.

The up-unit remover removes the second interference signal included in the third analog signal Vr22 received through the second antenna 51, and the third analog signal Vr22 converts the analog-digital signal. The second automatic gain control signal AG-sgn3 is generated based on the magnitude of the second digital signal D-sgn3 and the third analog signal is generated based on the generated second automatic gain control signal AG-sgn3. The signal generated during the processing of (Vr22) can be amplified.

The up-signal unit may include a third low noise amplifier 33, a second interference signal cancellation module 47, and a fourth low noise amplifier 48.

The third low noise amplifier 33 may receive the third analog signal Vr22 to low noise amplify and output the low noise amplified signal to the second interference signal removal module 47.

The second interference signal removing module 47 may remove the second interference signal from the signal output from the third low noise amplifier 33 and output the signal from which the second interference signal has been removed to the fourth low noise amplifier 48. .

The second interference signal canceling module 47 includes a second analog-to-digital converter 35, a third automatic gain amplifier 39, a second automatic gain control unit 37, a second interference signal canceling unit 41, and a fourth And an automatic gain amplifier 43 and a second digital-to-analog converter 45.

The configuration and operation of the second interference signal removal module 47 is the same as or similar to the configuration and operation of the first interference signal removal module 16, and thus a detailed description thereof will be omitted.

The fourth low noise amplifier 48 may low noise amplify the output signal of the second interference signal removing module 47 and output the low noise amplified signal as the fourth analog signal Vr2.

The second duplexer 31 may transmit (or induce) the third analog signal Vr22 received through the second antenna 51 to the up-unit in the reverse direction, and the downlink signal processor ( The second analog signal Vr11 received from the up-unit may be forwarded (or induced) to the second antenna 51 in the forward direction.

 The second antenna 51 may transmit and receive radio signals Vr11 and Vr22 to and from a terminal (not shown), and receive the second analog signal Vr11 from the second duplexer 31 and transmit the received signals to the terminal (not shown). have.

3 is a flowchart illustrating a method of canceling an interference signal according to an exemplary embodiment of the present invention. 1 to 3, the down-signal unit receives a first analog signal Vr1 including a first interference signal through a first antenna 11 (S10) and the first signal. Analog-to-digital conversion of the analog signal (Vr1) and the envelope of the analog-to-digital converted signal is detected (S20).

Further, the down-signal unit compares a value corresponding to the size of the envelope detected by the step S20 with a predetermined reference value and outputs a comparison result (S30).

When the value corresponding to the magnitude of the envelope detected by the step S20 is larger than a predetermined reference value, the down-signal processing unit (down-unit) first and second auto gain amplifiers 19 in the down-signal processing unit (down-unit) And operation 25) (S40).

Alternatively, the down-signal processing unit may perform first and second auto gain amplifiers in the down-signal processing unit when the value corresponding to the magnitude of the envelope detected by the step S20 is smaller than a predetermined reference value. The operations of 19 and 25 can be disabled (S45).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system.

Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (eg, transmission over the Internet). It also includes.

The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. And functional programs, codes and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram of a wireless repeater according to an embodiment of the present invention.

2 is a block diagram of the automatic gain control unit of FIG. 1.

3 is a flowchart illustrating a method of canceling an interference signal according to an exemplary embodiment of the present invention.

Claims (16)

A first antenna for transmitting and receiving a radio signal with a base station; A second antenna for transmitting and receiving a wireless signal with the terminal; And A signal processor for receiving and processing an analog signal received through any one of the first antenna and the second antenna and converts it into a signal for transmission through the other one of the first antenna and the second antenna It includes, The signal processing unit, The interference signal included in the analog signal received through the one antenna is removed, and the analog signal is generated based on the magnitude of the analog-digital converted digital signal. And in response to determining whether to amplify the signal generated during processing of the analog signal. The method of claim 1, wherein the signal processing unit, And detecting an envelope of the digital signal, comparing the detected envelope with a corresponding magnitude and a predetermined reference value, and generating the automatic gain control signal based on a comparison result. The method of claim 1, wherein the signal processing unit, Analog-to-digital conversion of the analog signal received through the one antenna, amplified analog-digital converted signal in response to the automatic gain control signal, remove the interference signal included in the amplified signal and the interference signal Wireless repeater for digital-to-analog conversion of the removed signal. The method of claim 3, wherein the signal processing unit, Before the digital-to-analog conversion, And amplifying the signal from which the interference signal has been removed in response to the auto gain control signal, and converting the amplified signal into the digital-analog conversion and outputting the digital-analog converted signal. The method of claim 1, wherein the signal processing unit, A first low noise amplifier for low noise amplifying the analog signal received through the one antenna and outputting a low noise amplified signal; Analog-to-digital conversion of the signal output from the first low noise amplifier, amplifying the analog-to-digital converted signal in response to the automatic gain control signal, remove the interference signal included in the amplified signal and the interference signal is removed An interference signal cancellation module for digitally-analog converting and outputting a signal; And And a second low noise amplifier for low noise amplifying the signal output from the interference signal removing module and transmitting the low noise amplified signal through the other antenna. The method of claim 5, wherein the interference signal cancellation module, An analog-digital converter for analog-to-digital converting the amplified analog signal output from the first low noise amplifier and outputting an analog-digital converted signal; A first auto gain amplifier for amplifying the output signal of the analog-to-digital converter and outputting the amplified signal in response to the auto gain control signal;  An interference signal removing unit which removes the interference signal from the output signal of the first automatic gain amplifier and outputs a signal from which the interference signal has been removed; A second automatic gain amplifier for amplifying the output signal of the interference signal canceller and outputting the amplified signal in response to the automatic gain control signal; A digital-analog converter configured to digital-analog convert the signal amplified by the second auto gain amplifier and output a digital-analog converted signal; And A wireless repeater including an automatic gain controller which generates the automatic gain control signal based on the output signal of the analog-digital converter and outputs the generated automatic gain control signal to the first automatic gain amplifier and the second automatic gain amplifier . The method of claim 6, wherein the automatic gain control unit, An envelope detector for detecting an envelope of an output signal of the analog-digital converter and outputting a detection result; And  And a comparator for comparing a value corresponding to the size of the envelope detected by the envelope detector with a predetermined reference value and outputting the automatic gain control signal based on a comparison result. The method of claim 7, wherein the envelope detection unit, An absolute value calculator for calculating an absolute value of the output of the analog-digital converter and outputting a calculation result;  A first multiplier for multiplying a first gain to an output value of the absolute value calculating unit and outputting a multiplied result; And  And a low pass filter for low pass filtering the output of the first multiplier and outputting a low pass filtered result to the comparator. The method of claim 8, wherein the low pass filter, An adder for adding the output of the absolute value calculating unit and the feedbacked output signal and outputting an addition result; A delayer for delaying the output of the adder by a predetermined time and outputting a delayed signal; And And a second multiplier for multiplying a second gain to an output signal of the delayer and outputting the multiplied result as the feedbacked output signal. An analog-digital converter configured to analog-digital convert an analog signal including an interference signal and output an analog-digital converted signal; A first auto gain amplifier for amplifying an output signal of the analog-to-digital converter and outputting the amplified signal in response to an auto gain control signal; An interference signal removing unit which removes the interference signal from the output signal of the first automatic gain amplifier and outputs a signal from which the interference signal has been removed; A second automatic gain amplifier for amplifying the output signal of the interference signal canceller and outputting the amplified signal in response to the automatic gain control signal; A digital-analog converter configured to digital-analog convert an output signal of the second auto gain amplifier and output a digital-analog converted signal; And Detecting the envelope of the output signal of the analog-to-digital converter and comparing the value corresponding to the magnitude of the detected envelope with a predetermined reference value and based on a comparison result, the automatic gain control signal and the first automatic gain amplifier and the second Interference signal cancellation module comprising an automatic gain control unit for outputting to the automatic gain amplifier. The method of claim 10, wherein the automatic gain control unit, An envelope detector for detecting the envelope of the signal output from the analog-digital converter and outputting a detection result; And  And a comparator for comparing the value corresponding to the size of the envelope detected by the envelope detector with the predetermined reference value and outputting the automatic gain control signal based on a comparison result. The method of claim 11, wherein the envelope detection unit, An absolute value calculator for calculating an absolute value of the output of the analog-digital converter and outputting a calculation result;  A first multiplier for multiplying a first gain to an output value of the absolute value calculating unit and outputting a multiplied result; And  And a low pass filter configured to low pass filter the output of the first multiplier and output a low pass filtered result to the comparator. The method of claim 12, wherein the low pass filter, An adder for adding the output of the absolute value calculating unit and the feedbacked output signal and outputting an addition result; A delayer for delaying the output of the adder by a predetermined time and outputting a delayed signal; And And a second multiplier for multiplying a second gain to an output signal of the delayer and outputting the multiplied result as the feedbacked output signal. Receiving an analog signal including an interference signal through an antenna; Generating an automatic gain control signal based on the magnitude of the digital signal obtained by analog-to-digital conversion of the analog signal; And And amplifying a signal generated during processing of the analog signal in response to the auto gain control signal, and removing the interference signal. The method of claim 14, wherein generating the automatic gain control signal comprises: Outputting the digital signal by analog-to-digital converting the analog signal; And Detecting an envelope of the digital signal, comparing a value corresponding to the detected envelope with a predetermined reference value, and generating the automatic gain control signal based on a comparison result. A recording medium on which a program for performing the method of claim 15 is recorded.

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