KR100430374B1 - Active Oscillator Protection Device By Feedback Signal of Wireless Transmitter for Mobile Communication - Google Patents

Abstract

According to the present invention, a part of the output of the wireless repeater is coupled to the intermediate frequency under the control of the feedback signal removing unit and then fed back to the signal synthesizing unit, and the output signal is fed back to the input side antenna and converted into the intermediate frequency signal to synthesize the signal. By inputting a negative signal and combining the feedback signal with an intermediate frequency to remove the feedback signal, the separation between the antennas is increased so as to increase the output and the oscillation phenomenon is eliminated. A forward or reverse feedback signal canceller which generates a reference signal for detecting a phase, a signal magnitude, and a change in delay time according to a change, and detects and analyzes a forward or reverse reference signal that is fed back to generate a forward or reverse feedback signal cancellation signal. And a first and second signal synthesizing and detecting unit, the first And the second frequency separator, the forward / reverse amplification and frequency converter, the forward / reverse signal synthesizer, the forward / reverse intermediate frequency signal processor, and the forward / reverse frequency converter and amplification unit, thereby eliminating feedback signals. Quality improvement is possible.

Description

Active Oscillator Protection Device By Feedback Signal of Wireless Transmitter for Mobile Communication}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless repeater for mobile communication. In particular, a part of an output of a wireless repeater is coupled to the feedback signal removing unit to control a high frequency (RF) signal to a high frequency signal synthesizing unit, and at the same time a portion of the signal After converting into an IF signal and feeding it back to the intermediate frequency signal synthesizing unit, the output signal is fed back to the input antenna and input to the high frequency signal synthesizing unit, which is synthesized from the feedback cancellation signal and the high frequency to remove the feedback signal. After converting the signal into the intermediate frequency signal synthesizing unit, it is synthesized at the feedback cancellation signal and the intermediate frequency to remove the feedback signal. The wireless signal output from the antenna is introduced into the receiving antenna The present invention relates to an active oscillation prevention device by a feedback signal of a wireless repeater for mobile communication, which prevents the oscillation generated.

In general, the wireless repeater for mobile communication is installed in a shaded area where the signal of the base station is difficult to reach, thereby improving the call quality. That is, the signal output from the base station is installed in a weak place to amplify the weak signal and output it to the mobile station, thereby serving to provide a better mobile communication service.

1 is a block diagram showing the configuration of a wireless repeater for a general mobile communication.

In the forward direction from the base station to the mobile station, the first antenna 100 for receiving the signal output from the base station, the first frequency separator 110 for separating the forward signal from the signal received from the first antenna 100, and Amplifying the signal separated by the first frequency separator 110, the forward amplification and frequency conversion unit 120 for converting to the intermediate frequency (IF), and the filter, amplified and gain adjustment of the signal converted to the intermediate frequency A forward intermediate frequency signal processor 130 for processing a forward intermediate frequency signal, and a forward frequency converter and amplifier 140 for restoring and then amplifying the processed forward intermediate frequency signal back to the original high frequency RF. And a second frequency separator 150 for separating the restored and amplified signal into a forward signal, and a second antenna 160 for transmitting a signal output from the second frequency separator 150 to a mobile station. Is done.

In the reverse direction from the mobile station to the base station, the second frequency separator for receiving the signal output from the mobile station and the second frequency separator for separating the reverse signal from the signals received from the second antenna 160 ( 150, a reverse amplification and frequency converter 170 for amplifying the reverse signal separated by the second frequency separator 150 and converting the reverse signal into an intermediate frequency signal, and filtering and amplifying the converted reverse intermediate frequency signal. A reverse intermediate frequency processing unit 180 that performs gain adjustment, a reverse frequency conversion and amplifying unit 190 which restores and amplifies the processed reverse intermediate frequency to the original high frequency, and separates the restored high frequency into a reverse signal. The first frequency separator 110 and the first antenna 100 for outputting the reverse signal separated by the first frequency separator 110 to the base station.

In the conventional mobile communication wireless repeater made as described above, looking at the operation of the forward link, the forward signal transmitted from the base station is received by the first antenna 100 and then separated into a forward signal by the first frequency separator 110 to forward amplify and It is transmitted to the frequency converter 120. The forward amplification and frequency converter 120 amplifies the input forward signal and converts it to an intermediate frequency IF. The converted intermediate frequency is filtered to a predetermined band by the forward intermediate frequency signal processor 130, the gain is amplified after being amplified, and then amplified after being converted back to the original high frequency by the forward frequency converter and amplifier 140. The amplified forward high frequency is separated into a forward signal by the second frequency separator 150 and then transmitted to the mobile station through the second antenna 160.

Next, referring to the operation of the reverse link, the reverse signal transmitted from the mobile station is received by the second antenna 160 and separated into a reverse signal in the second frequency separator 150 and transmitted to the reverse amplification and frequency converter 170. do.

The reverse amplification and frequency converter 170 amplifies the transmitted reverse signal and converts the intermediate signal into the intermediate frequency. The reverse intermediate frequency is thus filtered by the reverse intermediate frequency signal processor 180, and then the gain is adjusted. do. The reverse intermediate frequency signal processed as described above is converted back to the original high frequency by the reverse frequency conversion and amplification unit 190, and amplified to a predetermined level, and then separated into a reverse signal by the first frequency separator 110 to be the first antenna. Is passed to 100. The first antenna 100 transmits the transmitted reverse signal to the base station.

However, such a general wireless communication repeater has a problem that oscillation occurs because a signal transmitted to a transmission antenna is introduced into the reception antenna due to limited isolation between antennas.

As a conventional technology for solving the above-mentioned oscillation problem and to improve the call quality, it is disclosed in the Republic of Korea Patent Office Patent Registration No. 10-0305136 (name of the invention: a method and device for removing feedback signal of a wireless repeater for mobile communication) have.

The conventional technology as described above is a method of removing the feedback signal by controlling the phase and the magnitude of the signal.

On the other hand, the feedback signal is the phase of the signal and the magnitude of the signal changes over time, and the time delay also changes over time, and the feedback is substantially feedback using the prior art that controls the phase and the magnitude of the signal as described above. When the signal is removed, the feedback signal is temporarily removed at first, but the feedback signal is not removed as time passes because the time delay characteristic is not considered.

Accordingly, the present invention is proposed to solve the above problems of the prior art,

An object of the present invention is to adaptively detect a change over time of a feedback signal and to constantly remove the feedback signal, thereby preventing the oscillation phenomenon generated by the wireless signal output from the transmitting antenna into the receiving antenna. An active oscillation prevention device by a feedback signal of a communication wireless repeater is provided.

The present invention for achieving the above object,

Under the control of the feedback signal remover by coupling a part of the output of the radio repeater, the RF signal is fed back to the RF signal synthesizing unit, and at the same time, a part of the signal is converted into an intermediate frequency (IF) signal and then the intermediate frequency signal The signal is fed back to the combiner, and the output signal is fed back to the input antenna and input to the high frequency signal synthesizer. The feedback signal is combined with the high frequency signal to remove the feedback signal. By combining the feedback cancellation signal and the intermediate frequency to remove the feedback signal, the separation between the antennas is increased to increase the output and the oscillation phenomenon can be eliminated.

"Active oscillation prevention device by the feedback signal of the wireless repeater for mobile communication" according to the present invention for achieving the technical idea as described above,

Generates a reference signal for detecting phase and signal magnitude and delay time variation according to the time change of the forward feedback signal, detects and analyzes the forward reference signal fed back, and generates a forward feedback signal cancellation signal corresponding to the analysis result A forward feedback signal removing unit to remove the forward feedback signal;

Generates a reference signal for detecting phase, signal magnitude, and delay time variation according to the time change of the reverse feedback signal, detects and analyzes the reverse reference signal to be fed back, and generates a reverse feedback signal cancellation signal corresponding to the analysis result. A reverse feedback signal removing unit for removing the reverse feedback signal;

A first signal synthesizing and detecting unit detecting the forward feedback signal and transferring the forward feedback signal to the forward feedback signal removing unit, and combining the forward feedback signal removing signal and the forward signal outputted from the forward feedback signal removing unit to remove the feedback signal;

A second signal synthesizing and detecting unit detecting the reverse feedback signal and transferring the reverse feedback signal to the reverse feedback signal removing unit, and combining the reverse feedback signal removing signal and the reverse signal output from the reverse feedback signal removing unit to remove the feedback signal;

First and second frequency separators for frequency-dividing the forward and reverse signals output from the first and second signal synthesis and detection sections, respectively, in a forward and reverse direction, respectively;

A forward amplifying and frequency converting unit for amplifying the forward signal separated by the first frequency separator and converting the forward signal into an intermediate frequency (IF);

A forward signal synthesizing unit for synthesizing an input intermediate frequency signal output from the forward amplifying and frequency converting unit and a phase controlled intermediate frequency (IF) signal output from the forward frequency converting and amplifying unit in the forward feedback signal removing unit;

A forward intermediate frequency signal processor for processing a forward intermediate frequency signal by filtering, amplifying, and gain adjustment of a signal converted to an intermediate frequency output through the forward signal synthesizer;

A forward frequency converting and amplifying unit for restoring the forward intermediate frequency signal processed by the forward intermediate frequency signal processing unit back to the original high frequency (RF), amplifying the signal, and transmitting the amplified signal to a second frequency branching unit;

A reverse amplification and frequency converting unit for amplifying the reverse signal separated by the second frequency separator and converting the reverse signal into an intermediate frequency IF;

A reverse signal synthesizing unit for synthesizing the input intermediate frequency signal output from the reverse amplification and frequency conversion unit and the phase controlled intermediate frequency (IF) signal output from the forward frequency conversion and amplifying unit in the reverse feedback signal removing unit;

A reverse intermediate frequency signal processor for processing a reverse intermediate frequency signal by filtering, amplifying, and adjusting a signal converted to an intermediate frequency output through the reverse signal synthesizer;

And a reverse frequency converting and amplifying unit for restoring the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processing unit back to the original high frequency (RF) and then amplifying and transferring the reverse intermediate frequency signal to the first frequency separator.

In the above, the forward feedback signal removing unit,

A forward reference signal is generated to the second signal synthesizing and detecting unit in a frequency range in which the feedback signal is generated according to a control signal for generating a reference signal capable of measuring phase, magnitude, and delay according to a time change of a feedback signal. A reference signal generator;

A forward reference signal detector for filtering only a reference signal fed back from the forward high frequency signal detected by the first signal synthesizer and detector and outputting the filtered reference signal to a forward controller;

The generation of the forward reference signal is controlled, and the detected feedback reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the forward signal over time, and correspondingly to the detected signal. A forward control unit for generating a control signal for controlling the signal size and phase;

A forward time delay controller configured to time-delay a forward high frequency signal output from the second signal synthesis and detection unit according to the time delay control signal output from the forward control unit;

A forward signal size control unit controlling a magnitude of a forward high frequency signal output from the forward time delay control unit according to the signal size control signal output from the forward control unit;

In response to the phase control signal output from the forward control unit, the phase of the forward high frequency signal output from the forward signal magnitude control unit is controlled in reverse phase to forward feedback signal removal signal to the first signal synthesis and detection unit and forward frequency conversion and amplification unit. A forward phase controller for transmitting;

And a forward frequency converting and amplifying unit for restoring the forward high frequency signal output from the forward phase control unit back to the original intermediate frequency IF and then amplifying the forward high frequency signal to a forward signal synthesizing unit.

In the above, the reverse feedback signal removing unit,

A reverse direction in which a reference signal is generated to the first signal synthesis and detection unit in a frequency range in which a feedback signal is generated according to a control signal for generating a reference signal capable of measuring a phase, magnitude, and delay according to a time change of a feedback signal; A reference signal generator;

A reverse reference signal detector for filtering only a reference signal fed back from the reverse high frequency signal detected by the second signal synthesizer and detector and outputting the filtered reference signal to a reverse controller;

The generation of the reverse reference signal is controlled, and the detected feedback reverse reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the reverse signal over time, and correspondingly to the detected signal. A reverse control unit for generating a control signal for controlling the signal size and phase;

A reverse time delay control unit for time-delaying a reverse high frequency signal output from the first signal synthesis and detection unit according to the time delay control signal output from the reverse control unit;

A reverse signal size control unit controlling a magnitude of a reverse high frequency signal output from the reverse time delay control unit according to the signal size control signal output from the reverse control unit;

In response to the phase control signal output from the reverse control section, the phase of the reverse high frequency signal output from the reverse signal magnitude control section is controlled in the reverse phase to the reverse feedback signal removal signal to the second signal synthesis and detection section and the reverse frequency conversion and amplification section. A reverse phase control unit for transmitting;

And a reverse frequency converting and amplifying unit for restoring the reverse high frequency (RF) signal output from the reverse phase control unit back to the original intermediate frequency (IF) and transmitting the amplified signal to the reverse signal synthesizing unit.

1 is a block diagram showing the configuration of a wireless repeater for a general mobile communication,

2 is a block diagram showing the configuration of an active oscillation prevention device by a feedback signal of a wireless repeater for mobile communication according to the present invention;

3 is a conceptual diagram illustrating the concept of the present invention.

<Explanation of symbols for the main parts of the drawings>

600, 609 ..... the first and second antenna

601, 608 ..... First and second signal synthesis and detection unit

602, 607 ..... first and second frequency separator

603 ....... Forward amplification and frequency converter

604 ....... Forward signal synthesis section

605 ....... forward intermediate frequency signal processor

606 ....... Forward frequency conversion and amplifier

614 ....... Forward control

617 ....... Forward feedback signal canceller

618 ....... backward amplification and frequency converter

619 ....... Reverse signal synthesis section

620 ....... Reverse intermediate frequency signal processor

621 ...... Reverse frequency conversion and amplifier

626 ...... Reverse control

629 Reverse feedback signal canceller

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

3 is a view showing a concept for adaptively removing a feedback signal according to a time change according to the present invention.

Here, reference numeral 605 denotes a forward intermediate frequency signal processor, and an internal configuration represents all parts of a signal processing process until a signal through the first antenna 110 of FIG. 1 is output to the second antenna 160. , Operation is also the same as the operation described in FIG.

The signal received by the first antenna 600 from the base station is referred to as f1, the signal obtained by relaying the signal f1 is referred to as f1 ', and the signal fed back from the second antenna 609 to the first antenna 600 is forward. Since the magnitude, phase, and time delay of the output signal f1 'of the intermediate frequency signal processor 605 continuously fluctuate with time, the forward feedback signal remover 617 removes the forward feedback signal. In order to generate the signal, -f is generated and transmitted to the first signal synthesis and detection unit 601. The first signal synthesis and detection unit 601 outputs a signal obtained by adding the output signal f1 and the feedback signal f of the base station received by the first antenna 600 from the internal synthesizer 601a and the forward feedback signal removal unit 617. The feedback feedback signal -f is synthesized to remove the forward feedback signal, and only the pure base station output signal f1 is transmitted to the forward intermediate frequency signal processor 605.

Hereinafter, a preferred embodiment of an active oscillation preventing device by the feedback signal of the mobile communication wireless repeater according to the present invention to apply the above concept, that is, the feedback signal removing device of the mobile communication wireless repeater is as follows.

2 is a block diagram showing a configuration of an apparatus for removing feedback signals of a wireless repeater for mobile communication according to the present invention.

Here, reference numeral 600 denotes a first antenna for receiving a forward signal transmitted from a base station, and reference numeral 617 generates a reference signal for detecting a phase, signal magnitude, and delay time variation according to a time variation of the forward feedback signal. A forward feedback signal removal unit for detecting and analyzing a forward reference signal to be fed back, generating a forward feedback signal removal signal corresponding to the analysis result, and removing the forward feedback signal.

Also, reference numeral 629 generates a reference signal for detecting a phase, a signal magnitude, and a change in delay time according to a time change of the reverse feedback signal, detects and analyzes a feedback reverse feedback signal, and corresponds to the reverse result of the analysis. A reverse feedback signal removing unit generating a feedback signal removing signal to remove the reverse feedback signal, and a reference numeral 601 detects the forward feedback signal and transmits it to the forward feedback signal removing unit 617, and the forward feedback signal removing unit. A first signal synthesizing and detecting unit for combining the forward feedback signal removing signal and the forward signal outputted at 617 to remove the feedback signal is shown.

Also, reference numeral 608 detects the reverse feedback signal and transmits the reverse feedback signal to the reverse feedback signal removing unit 629, and combines the reverse feedback signal removing signal and the reverse signal output from the reverse feedback signal removing unit 629 to feed back the feedback signal. A second signal synthesizing and detecting unit for removing a signal is shown, and reference numerals 602 and 607 denote frequencies for separating the forward and reverse signals output from the first and second signal synthesizing and detecting units 601 and 608, respectively. 1 and the second frequency separator.

Reference numeral 603 denotes a forward amplification and frequency converter for amplifying the forward signal separated by the first frequency separator 602 and converting the forward signal into an intermediate frequency IF. Reference numeral 604 denotes the forward amplification and frequency converter. Forward signal synthesis for synthesizing the forward intermediate frequency signal output from the 603 and the forward feedback intermediate frequency signal output in the phase controlled state by the forward frequency conversion and amplifying unit 613 in the forward feedback signal removing unit 617. Represents wealth.

In addition, reference numeral 605 filters, amplifies, and adjusts a signal converted to an intermediate frequency IF output through the forward signal synthesis unit 604 to process a forward intermediate frequency signal as a forward signal to be relayed. Reference numeral 606 denotes a forward intermediate frequency signal processor, and a second frequency branching signal 607 is obtained by restoring the forward intermediate frequency signal processed by the forward intermediate frequency signal processor 605 back to the original high frequency RF and then amplifying the signal. Forward frequency conversion and amplification part interfaced with).

On the other hand, 618 denotes a reverse amplification and frequency conversion unit for amplifying the reverse signal separated by the second frequency separator 607, and converts it to an intermediate frequency (IF), reference numeral 619 denotes the reverse amplification and frequency conversion unit 618 And a reverse signal synthesizing unit for synthesizing the reverse intermediate frequency signal outputted from the reverse feedback intermediate frequency signal output from the reverse frequency conversion and amplifying unit 622 in the reverse feedback signal canceling unit 622 and the reverse feedback intermediate frequency signal. .

In addition, reference numeral 620 filters the signal converted to the intermediate frequency IF output through the reverse signal synthesizing unit 619, amplifies, and performs gain adjustment to process the reverse intermediate frequency signal as a forward signal to be relayed. The reverse intermediate frequency signal processing unit is indicated by reference numeral 621. The reverse intermediate frequency signal processed by the reverse intermediate frequency signal processing unit 620 is restored to the original high frequency (RF) and amplified by first frequency branching (602). A reverse frequency conversion and amplifying unit for interfacing with &lt; RTI ID = 0.0 &gt;), &lt; / RTI &gt;

The forward feedback signal removing unit 617,

A forward reference signal is generated to the second signal synthesis and detection unit 608 in a frequency range in which the feedback signal is generated according to a control signal for generating a reference signal capable of measuring a phase, magnitude, and delay according to a time change of the feedback signal. Generating a forward reference signal generator 616; A forward reference signal detector 615 for filtering only a reference signal fed back from the forward high frequency signal detected by the first signal synthesis and detection unit 601 and outputting the filtered reference signal to a forward controller 614; The generation of the forward reference signal is controlled, and the detected feedback reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the forward signal over time, and correspondingly to the detected signal. A forward control unit 614 for generating a control signal for controlling the signal size and phase; A forward time delay control unit 612 for time delaying the forward high frequency signal output from the second signal synthesis and detection unit 608 according to the time delay control signal output from the forward control unit 614; A forward signal size control unit 611 for controlling the size of the forward high frequency signal output from the forward time delay control unit 612 according to the signal size control signal output from the forward control unit 614; According to the phase control signal output from the forward control unit 614, the phase of the forward high frequency signal output from the forward signal magnitude control unit 611 is controlled in reverse phase so that the first signal synthesis and detection unit may be used as a forward feedback signal removal signal. A forward phase control unit 610 for transmitting to the forward frequency conversion and amplifying unit 613; The forward frequency converting and amplifying unit 613 restores the forward high frequency RF signal output from the forward phase control unit 610 back to the original intermediate frequency IF, and then amplifies and forwards the signal to the forward signal synthesizing unit 604. It consists of;

In the above, the reverse feedback signal removing unit 629,

In response to a control signal for generating a reference signal capable of measuring a phase, a magnitude, and a delay according to a time change of a feedback signal, a reverse reference signal is transmitted to the first signal synthesis and detection unit 601 in a frequency range in which the feedback signal is generated. Generating a backward reference signal generator 627; A reverse reference signal detector 628 for filtering only a reference signal fed back from the reverse high frequency signal detected by the second signal synthesis and detector 608 and outputting the filtered to the reverse controller 626; The generation of the reverse reference signal is controlled, and the detected feedback reverse reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the reverse signal over time, and correspondingly to the detected signal. A reverse control unit 626 for generating a control signal for controlling the signal size and phase; A reverse time delay control unit 623 for time delaying the reverse high frequency signal output from the first signal synthesis and detection unit 601 according to the time delay control signal output from the reverse control unit 626; A reverse signal size control unit 624 for controlling the magnitude of the reverse high frequency signal output from the reverse time delay control unit 623 according to the signal size control signal output from the reverse control unit 626; According to the phase control signal output from the reverse control unit 626, the phase of the reverse high frequency signal output from the reverse signal magnitude control unit 624 is controlled in the reverse phase, and the second signal synthesis and detection unit is used as a reverse feedback signal removal signal. 608 and a reverse phase control unit 625 transferring the reverse frequency conversion and amplification unit 622; Reverse frequency conversion and amplifying unit 622 restores the reverse feedback high frequency (RF) signal output from the reverse phase control unit 625 back to the original intermediate frequency (IF) and then amplifies and transfers the signal to the reverse signal synthesis unit 619. );

Active oscillation prevention device by the feedback signal of the mobile repeater for mobile communication according to the present invention configured as described above, the feedback signal is removed separately for the forward link and the reverse link, the following for the convenience of the description of the feedback signal of the forward link first The removal process will be described, and after the description thereof, the feedback signal removal process of the reverse link will be described.

First, the forward controller 614 applies a control signal to the forward reference signal generator 616 to remove the forward feedback signal. The forward reference signal generator 616 receiving the control signal generates a forward reference signal within a frequency range in which the feedback signal is generated as a reference signal for measuring the phase, magnitude, and delay time variation of the signal according to the change in the time of the feedback signal. To the second signal synthesis and detection unit 608.

The second signal synthesis and detection unit 608 includes a first signal synthesis and detection unit 601, a first frequency separator 602, a forward amplification and frequency conversion unit 603, a forward signal synthesis unit 604, and a forward intermediate frequency. The forward signal processed by the processor 605, the forward frequency converter and amplifier 606, and the second frequency separator 607 together with the forward reference signal are combined and transmitted to the mobile station through the second antenna 609.

In this case, the first frequency separator 602 frequency-separates the forward signal output from the first signal synthesis and detection unit 601 to the forward amplification and frequency converter 603, and thus, the forward amplification and frequency converter. In 603, the forward signal separated by the first frequency separator 602 is amplified, converted into an intermediate frequency IF, and transmitted to the forward signal synthesizer 604.

Accordingly, the forward signal synthesizing unit 604 controls the phase of the forward intermediate frequency signal and the forward feedback signal removing unit 617 output from the forward amplifying and frequency converting unit 603. The synthesized forward feedback intermediate frequency signal is output to the forward intermediate frequency signal processor 605.

Therefore, the forward intermediate frequency signal processing unit 605 filters, amplifies, and adjusts the signal converted into the intermediate frequency IF from the signal output through the forward signal synthesis unit 604 to perform a forward intermediate frequency signal. It is processed as a forward signal to be relayed and forwarded to the forward frequency converter and amplifier 606.

Accordingly, the second frequency divergence 607 is restored by the forward intermediate frequency signal processed by the forward intermediate frequency signal processor 605 by the forward frequency converter and amplifier 606 back to the original high frequency RF and then amplified. In the second frequency separator 607, the forward frequency signal to be relayed is separated by an intermediate frequency, and then transmitted to the second signal synthesis and detection unit 608.

Meanwhile, the forward signal transmitted from the second antenna 609 is fed back through the first antenna 600 to the first signal synthesis and detection unit 601, and the first signal synthesis and detection unit 601 is input. The forward signal is transmitted to the first frequency separator 602 as described above, and at the same time, the forward delay time control unit in the forward reference signal detector 615 in the forward feedback signal remover 617 and the reverse feedback signal remover 629 623).

The forward reference signal detector 615 converts the forward signal transmitted from the forward signal into an intermediate frequency, detects only a pure reference signal through a filtering function, and delivers the pure reference signal to the forward controller 614.

Accordingly, the forward control unit 614 calculates a time delay, a signal magnitude, and a phase change amount according to a time change by comparing and analyzing the first generated reference signal and the detected reference signal. In addition, a time delay control signal is provided to the forward time delay control unit 612, a signal size control signal is provided to the forward signal size control unit 611, and a phase control signal is provided to the forward phase control unit 610.

The forward time delay control unit 612 adjusts the time delay of the forward signal output from the second signal synthesis and detection unit 608 according to the input time delay control signal to always have the same time delay as the feedback signal so that the forward signal size Transfer to control unit 611.

The forward signal size control unit 611 may always adjust the size of the forward intermediate frequency signal output from the forward time delay control unit 612 according to the signal size control signal output from the forward control unit 614 to the same signal as the feedback signal. It is controlled to have a forward phase control unit 610.

Next, the forward phase control unit 610 phases the phase of the forward intermediate frequency signal output from the forward signal magnitude control unit 611 according to the phase control signal output from the forward control unit 614 so that it is always opposite to the feedback signal. The control unit transmits the control signal to the forward frequency conversion and amplification unit 613 and the first signal synthesis and detection unit 601 as a forward feedback signal removal signal.

Accordingly, the forward frequency converting and amplifying unit 613 restores the forward high frequency signal fed back through the forward phase control unit 610 back to the original intermediate frequency IF and amplifies it to the forward signal synthesizing unit 604. To pass.

Then, the forward signal combiner 604 outputs a signal input through the first antenna 600, that is, a signal obtained by combining the forward intermediate frequency signal and the feedback signal output from the base station and the forward feedback signal remover 617. A forward feedback signal removing signal (ie, an intermediate frequency signal) is synthesized, and only the pure forward signal from which the forward feedback signal is removed is transmitted to the forward intermediate frequency signal processor 605.

Accordingly, the forward intermediate frequency signal processing unit 605 filters, amplifies, and adjusts a signal converted to an intermediate frequency IF output through the forward signal synthesis unit 604 to relay the forward intermediate frequency signal. Since it is processed as a forward signal to be transmitted to the forward frequency conversion and amplification unit 606, the forward frequency conversion and amplification unit 606 in the forward intermediate frequency signal processed by the forward intermediate frequency signal processor 605 again After recovering to the original high frequency RF, amplification is performed to interface with the second frequency branching 607.

Through this process, the forward feedback signal is removed, thereby preventing the oscillation phenomenon caused by the feedback signal fed back through the output antenna (feedback) to the input antenna in advance.

Next, the operation of the reverse link is as follows.

First, the reverse controller 626 applies a control signal to the reverse reference signal generator 627 to remove the reverse feedback signal. The reverse reference signal generator 627 receiving the control signal generates a reverse reference signal within a frequency range in which the feedback signal is generated as a reference signal for measuring the phase, magnitude, and delay time variation of the signal according to the change in the time of the feedback signal. To the first signal synthesis and detection unit 601.

The first signal synthesis and detection unit 601 includes a second signal synthesis and detection unit 608, a second frequency separator 607, a reverse amplification and frequency conversion unit 618, a reverse signal synthesis unit 619, and a reverse intermediate frequency. The backward signal processed by the processor 620, the forward frequency converter and amplifier 621, and the first frequency separator 602 and the backward reference signal are added together and transmitted to the base station through the first antenna 600.

In this case, the second frequency separator 607 separates the reverse signal output from the second signal synthesis and detection unit 608 and transfers the reverse signal to the reverse amplification and frequency conversion unit 618 so that the reverse amplification and frequency conversion unit ( In 618, the reverse signal separated by the second frequency separator 607 is amplified, converted into an intermediate frequency IF, and transmitted to the reverse signal synthesizer 619.

Accordingly, the reverse signal synthesizing unit 619 controls the phase of the reverse intermediate frequency signal and the reverse frequency conversion and amplifying unit 622 in the reverse intermediate frequency signal and the reverse feedback signal removing unit 629 output from the reverse amplifying and frequency converting unit 607. The reverse intermediate frequency signals outputted in the same state are synthesized and transmitted to the reverse intermediate frequency signal processor 620.

Therefore, the reverse intermediate frequency signal processor 620 filters, amplifies, and gains a signal converted into the intermediate frequency IF from the signal output through the reverse signal synthesizer 620 to perform a reverse intermediate frequency signal. It is processed as a reverse signal to be relayed to pass to the reverse frequency conversion and amplifier 621.

Accordingly, the reverse frequency conversion and amplifying unit 621 restores the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processing unit 620 back to the original high frequency RF and then amplifies the first frequency branching signal 602. In the first frequency divider 602, the forward frequency signal to be relayed is separated by an intermediate frequency and transmitted to the first signal synthesis and detection unit 601.

Meanwhile, the reverse signal transmitted from the first antenna 600 is fed back through the second antenna 609 to the second signal synthesis and detection unit 608, and the second signal synthesis and detection unit 608 is input. A forward time delay control unit in the reverse reference signal detector 628 and the forward feedback signal remover 617 in the reverse feedback signal remover 629 while simultaneously transmitting the reverse signal to the second frequency separator 607 as described above. Forward to 612.

The reverse reference signal detector 628 converts the reverse signal transmitted to the intermediate frequency, detects only a pure reference signal through a filtering function, and delivers the pure reference signal to the reverse controller 626.

Accordingly, the reverse control unit 626 calculates the time delay, signal magnitude, and phase change amount according to the time change by comparing and analyzing the first generated reference signal and the detected reference signal. In addition, the time delay control signal is provided to the reverse time delay control unit 623, the signal size control signal is provided to the forward signal size control unit 624, and the phase control signal is provided to the forward phase control unit 625.

The reverse time delay control unit 625 adjusts the time delay of the reverse signal output from the first signal synthesis and detection unit 601 according to the input time delay control signal to always have the same time delay as the feedback signal to reverse the signal size. Transfer to control unit 624.

The reverse signal size control unit 624 always equals the magnitude of the reverse intermediate frequency signal output from the reverse time delay control unit 623 according to the signal size control signal output from the reverse control unit 626. It controls to have it and delivers it to the reverse phase control part 625.

Next, the reverse phase control unit 625 phases the phase of the reverse intermediate frequency signal output from the reverse signal magnitude control unit 624 to always be in phase opposite to the feedback signal according to the phase control signal output from the reverse control unit 626. The control signal is transmitted to the reverse frequency converter and amplifier 622 and the second signal synthesizer and the detector 608 as a reverse feedback signal removal signal.

Accordingly, the reverse frequency converting and amplifying unit 622 restores the reverse high frequency signal fed back through the reverse phase control unit 625 back to the original intermediate frequency IF and amplifies the reverse high frequency signal to the reverse signal synthesizing unit 619. To pass.

Then, the reverse signal synthesizing unit 619 outputs a signal input through the second antenna 609, that is, a signal obtained by combining the reverse intermediate frequency signal and the feedback signal output from the mobile station and the reverse feedback signal removing unit 629. The pure feedback signal from which the reverse feedback signal is removed by synthesizing the reverse feedback signal removal signal (that is, the intermediate frequency signal) is transmitted to the reverse intermediate frequency signal processor 620.

Accordingly, the reverse intermediate frequency signal processor 620 relays the reverse intermediate frequency signal by filtering, amplifying, and adjusting a signal converted to the intermediate frequency IF output through the reverse signal synthesis unit 619. Since it is processed as a reverse signal to be transmitted to the reverse frequency conversion and amplification unit 621, the reverse frequency conversion and amplification unit 621 again processes the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processor 620 again. After the restoration to the original high frequency (RF) it is amplified to interface with the first frequency branching (602).

Through this process, the reverse feedback signal is removed, thereby preventing the oscillation caused by the feedback signal fed back through the input antenna to the output antenna.

In other words, the present invention is a device for detecting a part of the output signal to synthesize the feedback signal according to the time change after the input antenna and at the same time synthesized in the IF signal processing unit to remove the feedback signal, which is fed back from the output antenna 609 The signal is input to the input antenna 600 and input to the first signal synthesis and detection unit 601.

In addition, the feedback signal is converted into an intermediate frequency by the forward amplification and frequency converter 603 and input to the forward signal synthesizer 604.

A part of the output signal is detected by the second signal synthesis and detection unit 608 and input to the forward feedback signal removing unit 617, and the input signal corresponds to the time variation of the feedback signal analyzed through the reference signal of the forward control unit 614. The first signal synthesis and detection unit 1 by controlling each control unit according to the amount of change according to the time delay control unit 612 by the time delay control unit 612, the signal magnitude by the forward signal size control unit 611, and the phase control unit by the forward phase control unit 610. Inputted to 601, the feedback signal is combined with the high frequency to remove the feedback signal.

At the same time, the signal output from the forward phase control unit 610 is input to the forward frequency conversion and amplification unit 613, is converted into an intermediate frequency (IF), and after the amplification process, is input to the forward signal synthesis unit 604 is fed back feedback signal The feedback signal is removed by combining the intermediate and intermediate frequencies of.

That is, the signal transmitted from the base station is received by the receiving antenna 600 and input to the first signal synthesizing and detecting unit 601 is selected in the forward direction in the first frequency separator 602 to the forward amplification and frequency converter 603 The low noise amplification of the forward signal is then performed and converted to an intermediate frequency.

The converted IF frequency signal is input to the forward signal synthesizing unit 604, and the signal output from the forward signal synthesizing unit 604 is input to the forward intermediate frequency signal processing unit 605, filtered, and then amplified. The conversion and amplification unit 606 converts the high frequency RF back and then amplifies it.

Then, after passing through the second frequency separator 607, it is input to the second signal synthesis and detection unit 2 (608), output to the output antenna 609, and sent to the mobile station.

At this time, a part of the transmitted signal is fed back to the input antenna 600 and input to the first signal synthesis and detection unit 601 to be synthesized from the feedback cancellation signal, which is the output of the forward feedback signal removal unit 617, and the high frequency feedback. At the same time as the signal is removed, the feedback signal is selected in the forward direction in the first frequency separator 602, converted into the intermediate frequency in the forward amplification and frequency converter 603, and then input to the forward signal synthesizer 604, where the forward signal is forward. The feedback signal is removed by combining the feedback cancellation signal, which is the output of the feedback signal removal unit 617, with an intermediate frequency.

As a result, the feedback signal is removed, and only the signal to be serviced is wirelessly relayed and transmitted to the mobile station.

The present invention described above has described the case where both the forward feedback canceling device and the reverse feedback canceling device are implemented in a wireless repeater, and the active oscillation preventing device based on the feedback signal is selectively selected as the forward feedback canceling device and the reverse feedback removing device for convenience. Only one can be applied to eliminate the feedback signal.

The present invention described above can adaptively detect a change over time of the feedback signal and constantly remove the feedback signal, thereby preventing the oscillation phenomenon caused by the wireless signal output from the transmitting antenna being introduced into the receiving antenna. There is an advantage to that.

In addition, since the oscillation phenomenon can be eliminated as described above, the output of the antenna can be relatively increased, so that the call quality can be improved.

Claims (3)

In the active oscillation prevention device by the feedback signal of the wireless repeater for mobile communication, Generates a reference signal for detecting phase and signal magnitude and delay time variation according to the time change of the forward feedback signal, detects and analyzes the forward reference signal fed back, and generates a forward feedback signal cancellation signal corresponding to the analysis result A forward feedback signal removing unit to remove the forward feedback signal; Generates a reference signal for detecting phase, signal magnitude, and delay time variation according to the time change of the reverse feedback signal, detects and analyzes the reverse reference signal to be fed back, and generates a reverse feedback signal cancellation signal corresponding to the analysis result. A reverse feedback signal removing unit for removing the reverse feedback signal; A first signal synthesizing and detecting unit detecting the forward feedback signal and transferring the forward feedback signal to the forward feedback signal removing unit, and combining the forward feedback signal removing signal and the forward signal outputted from the forward feedback signal removing unit to remove the feedback signal; A second signal synthesizing and detecting unit detecting the reverse feedback signal and transferring the reverse feedback signal to the reverse feedback signal removing unit, and combining the reverse feedback signal removing signal and the reverse signal output from the reverse feedback signal removing unit to remove the feedback signal; First and second frequency separators for frequency-dividing the forward and reverse signals output from the first and second signal synthesis and detection sections, respectively, in a forward and reverse direction, respectively; A forward amplifying and frequency converting unit for amplifying the forward signal separated by the first frequency separator and converting the forward signal into an intermediate frequency (IF); A forward signal synthesizing unit for synthesizing an input intermediate frequency signal output from the forward amplifying and frequency converting unit and a phase controlled intermediate frequency (IF) signal output from the forward frequency converting and amplifying unit in the forward feedback signal removing unit; A forward intermediate frequency signal processor for processing a forward intermediate frequency signal by filtering, amplifying, and gain adjustment of a signal converted to an intermediate frequency output through the forward signal synthesizer; A forward frequency converting and amplifying unit for restoring the forward intermediate frequency signal processed by the forward intermediate frequency signal processing unit back to the original high frequency (RF), amplifying the signal, and transmitting the amplified signal to a second frequency branching unit; A reverse amplification and frequency converting unit for amplifying the reverse signal separated by the second frequency separator and converting the reverse signal into an intermediate frequency IF; A reverse signal synthesizing unit for synthesizing the input intermediate frequency signal output from the reverse amplification and frequency conversion unit and the phase controlled intermediate frequency (IF) signal output from the forward frequency conversion and amplifying unit in the reverse feedback signal removing unit; A reverse intermediate frequency signal processor for processing a reverse intermediate frequency signal by filtering, amplifying, and adjusting a signal converted to an intermediate frequency output through the reverse signal synthesizer; A reverse frequency conversion and amplifying unit for restoring the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processing unit back to the original high frequency (RF) and amplifying and transferring the reverse intermediate frequency signal to the first frequency separator; Active oscillation prevention device by feedback signal of wireless repeater. The method according to claim 1. The forward feedback signal removing unit, A forward reference signal is generated to the second signal synthesizing and detecting unit in a frequency range in which the feedback signal is generated according to a control signal for generating a reference signal capable of measuring phase, magnitude, and delay according to a time change of a feedback signal. A reference signal generator; A forward reference signal detector for filtering only a reference signal fed back from the forward high frequency signal detected by the first signal synthesizer and detector and outputting the filtered reference signal to a forward controller; The generation of the forward reference signal is controlled, and the detected feedback reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the forward signal over time, and correspondingly to the detected signal. A forward control unit for generating a control signal for controlling the signal size and phase; A forward time delay controller configured to time-delay a forward high frequency signal output from the second signal synthesis and detection unit according to the time delay control signal output from the forward control unit; A forward signal size control unit controlling a magnitude of a forward high frequency signal output from the forward time delay control unit according to the signal size control signal output from the forward control unit; In response to the phase control signal output from the forward control unit, the phase of the forward high frequency signal output from the forward signal magnitude control unit is controlled in reverse phase to forward feedback signal removal signal to the first signal synthesis and detection unit and forward frequency conversion and amplification unit. A forward phase controller for transmitting; The feedback of the wireless repeater for mobile communication, comprising: a forward frequency conversion and amplification unit for restoring the forward high frequency signal output from the forward phase control unit back to the original intermediate frequency (IF) and amplifying and forwarding it to the forward signal synthesizing unit; Active oscillation prevention device by signal. The method according to claim 1, The reverse feedback signal removing unit, A reverse direction in which a reference signal is generated to the first signal synthesis and detection unit in a frequency range in which a feedback signal is generated according to a control signal for generating a reference signal capable of measuring a phase, magnitude, and delay according to a time change of a feedback signal; A reference signal generator; A reverse reference signal detector for filtering only a reference signal fed back from the reverse high frequency signal detected by the second signal synthesizer and detector and outputting the filtered reference signal to a reverse controller; The generation of the reverse reference signal is controlled, and the detected feedback reverse reference signal is analyzed to detect an amount of change in phase / signal size / time delay of the reverse signal over time, and correspondingly to the detected signal. A reverse control unit for generating a control signal for controlling the signal size and phase; A reverse time delay control unit for time-delaying a reverse high frequency signal output from the first signal synthesis and detection unit according to the time delay control signal output from the reverse control unit; A reverse signal size control unit controlling a magnitude of a reverse high frequency signal output from the reverse time delay control unit according to the signal size control signal output from the reverse control unit; In response to the phase control signal output from the reverse control section, the phase of the reverse high frequency signal output from the reverse signal magnitude control section is controlled in the reverse phase to the reverse feedback signal removal signal to the second signal synthesis and detection section and the reverse frequency conversion and amplification section. A reverse phase control unit for transmitting; A reverse frequency converting and amplifying unit for restoring the reverse high frequency (RF) signal output from the reverse phase control unit back to the original intermediate frequency (IF) and amplifying and transmitting the reverse frequency synthesizer to a reverse signal synthesizing unit; Active oscillation prevention device by feedback signal of repeater.