KR100430373B1 - 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. 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 the output of the wireless repeater is coupled to the intermediate frequency under the control of the feedback signal removing device, and then fed back to the signal synthesizer, and the output signal is fed back to the input antenna. It converts into intermediate frequency signal and inputs it to the signal synthesizing unit and synthesizes it from the feedback signal and the intermediate frequency to remove the feedback signal. 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 phenomenon generated by the wireless signal output from the antenna to the reception antenna.

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,

A part of the output of the wireless repeater is coupled to the intermediate frequency under the control of the feedback signal removing device, and then fed back to the signal synthesizing unit. By removing the feedback signal by synthesizing the feedback signal with the intermediate frequency, 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,

Amplifies the forward signal and converts it to an intermediate frequency (IF) to generate a reference signal for detecting the phase, signal magnitude and delay time variation according to the time change of the forward feedback signal, detects and analyzes the feedback forward reference signal, A forward feedback signal removal unit generating a forward feedback signal removal signal corresponding to the analysis result and removing the forward feedback signal;

Amplify the reverse signal and convert it to the intermediate frequency (IF) to generate a reference signal for detecting the phase and signal magnitude and the delay time change according to the time change of the reverse feedback signal, detect and analyze the feedback reverse feedback signal, A reverse feedback signal removing unit generating a reverse feedback signal removing signal corresponding to the analysis result and 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 reverse feedback signal removing signal output from the reverse feedback signal removing unit and the forward signal 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 forward feedback signal removing signal and the reverse signal output from the forward 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 a signal output from the forward amplifying and frequency converting unit and a signal output in a phase controlled state from a forward phase control 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 signal output from the reverse amplifying and frequency converting unit and the signal output in a phase controlled state from the reverse phase control 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 signal detected by the first signal synthesis 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 frequency converting and amplifying unit for restoring a forward intermediate frequency signal fed back through the second signal synthesizing and detecting unit back to an original high frequency (RF) and amplifying the signal to be forwarded to a forward time delay control unit;

A forward time delay controller for delaying a forward high frequency signal output from the forward frequency converter and amplifier according to the time delay control signal output from the forward controller;

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;

A forward phase control unit controlling a phase of a forward high frequency signal output from the forward signal size control unit in reverse phase according to the phase control signal output from the forward control unit, and forwarding the forward feedback signal removing signal to the forward signal synthesis unit; It is characterized by.

In the above, the reverse feedback signal removing unit,

A reverse direction that generates a reverse reference signal to the first signal synthesis and detection 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 reverse reference signal detector for filtering only a reference signal fed back from the reverse 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 frequency converting and amplifying unit for restoring the reverse intermediate frequency signal fed back through the first signal synthesizing and detecting unit back to the original high frequency (RF) and amplifying the signal to be transmitted to the reverse time delay control unit;

A reverse time delay control unit for time-delaying a reverse high frequency signal output from the reverse frequency conversion and amplifying 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;

A reverse phase controller configured to control a phase of a reverse high frequency signal output from the reverse signal size control unit to a reverse phase according to the phase control signal output from the reverse control unit and transmit the reverse feedback signal removal signal to the reverse signal synthesis unit; It is characterized by.

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>

500, 509 ..... First and second antennas

501, 508 ..... First and second signal synthesis and detection unit

502, 507 ..... first and second frequency separator

503 ....... Forward amplification and frequency converter

504 ....... forward signal synthesis section

505 ....... Forward intermediate frequency signal processor

506 ....... Forward Frequency Conversion and Amplifier

514 ....... forward control

517 ....... forward feedback signal canceller

518 ....... backward amplification and frequency converter

519 ....... Reverse signal synthesis section

520 ....... Reverse intermediate frequency signal processor

521 ....... Reverse Frequency Conversion and Amplifier

526 ....... Reverse control

529 ..... 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 505 denotes a forward intermediate frequency signal processor, and an internal configuration represents all parts that perform a signal processing process until a signal through the first antenna 110 of FIG. 1 is output to the second antenna 150. , Operation is also the same as the operation described in FIG.

The signal received by the first antenna 500 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 509 to the first antenna 500 is forward. Since the magnitude, phase, and time delay of the output signal f1 'of the intermediate frequency signal processor 505 continuously fluctuate with time, the forward feedback signal remover 517 removes the forward feedback signal. In order to generate the signal, -f is generated and transmitted to the first signal synthesis and detection unit 501. The first signal synthesis and detection unit 501 outputs a signal obtained by adding the output signal f1 and the feedback signal f of the base station received by the first antenna 500 by the internal synthesizer 501a and the forward feedback signal removal unit 517. 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 505.

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.

In this case, reference numeral 500 denotes a first antenna for receiving a forward signal transmitted from a base station, and reference numeral 517 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 529 generates a reference signal for detecting a phase, a signal magnitude, and a delay time change amount 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 501 detects the forward feedback signal and transmits it to the forward feedback signal removing unit 517 and the reverse feedback signal removing unit. Synthesizing the reverse feedback signal removal signal and the forward signal output from the 529 to remove the feedback signal and simultaneously transmitting the reverse intermediate frequency signal to the reverse frequency conversion and amplifying unit 522 in the reverse feedback signal removing unit 529. A first signal synthesizing and detecting unit is shown.

In addition, the reference numeral 508 detects the reverse feedback signal and transmits the reverse feedback signal to the reverse feedback signal remover 529, and combines the reverse feedback signal and the reverse signal output from the forward feedback signal remover 517 to feedback the feedback. A second signal synthesizing and detecting unit for removing a signal and transmitting a forward intermediate frequency signal to a forward frequency converting and amplifying unit 513 in the forward feedback signal removing unit 517, and reference numerals 502 and 507 denote the first signal. And first and second frequency separators for frequency-dividing the forward and reverse signals output from the second signal synthesis and detection units 501 and 508, respectively.

Reference numeral 503 denotes a forward amplification and frequency converting section for amplifying the forward signal separated by the first frequency separator 502 and converting it into an intermediate frequency IF, and reference numeral 504 denotes the forward amplifying and frequency converting section. A forward signal synthesizing unit for synthesizing the forward signal output from 503 and the signal output in a phase controlled state by the forward phase control unit 510 in the forward feedback signal removing unit 517.

In addition, reference numeral 505 filters, amplifies, and adjusts a signal converted to an intermediate frequency IF output through the forward signal synthesizing unit 504 to process a forward intermediate frequency signal as a forward signal to be relayed. Reference numeral 506 denotes a forward intermediate frequency signal processing unit, and reference numeral 506 restores the forward intermediate frequency signal processed by the forward intermediate frequency signal processing unit 505 back to the original high frequency (RF) and then amplifies the second frequency branching (507). Forward frequency conversion and amplification part interfaced with).

On the other hand, 518 denotes a reverse amplification and frequency conversion unit for amplifying the reverse signal separated by the second frequency separator 507, and converts to the intermediate frequency (IF), reference numeral 519 denotes the reverse amplification and frequency conversion unit 518 The reverse signal synthesizing unit for synthesizing the reverse signal output from the signal and the signal output in the phase-controlled state by the reverse phase control unit 525 in the reverse feedback signal removing unit 529.

Reference numeral 520 also filters, amplifies, and adjusts a signal converted to an intermediate frequency IF output through the reverse signal synthesizing unit 519 to process a reverse intermediate frequency signal as a forward signal to be relayed. The reverse intermediate frequency signal processor 521 denotes a reverse intermediate frequency signal processor 520, and restores the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processor 520 back to the original high frequency RF and then amplifies the first frequency branching signal 502. 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 517,

According to the control signal for generating a reference signal for measuring the phase, magnitude and delay of the feedback signal over time, the forward reference signal is transmitted to the second signal synthesis and detection unit 508 in a frequency range in which the feedback signal is generated. Generating a forward reference signal generator 516; A forward reference signal detector 515 for filtering only a reference signal fed back from the forward signal detected by the first signal synthesis and detector 501 and outputting the filtered to the forward controller 514; 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 514 for generating a control signal for controlling the signal size and phase; A forward frequency converter and amplifying unit 513 for restoring a forward intermediate frequency signal fed back through the second signal synthesizing and detecting unit 508 back to the original high frequency (RF), amplifying the signal, and transmitting the amplified signal to the forward time delay control unit 512. )Wow; A forward time delay control unit 512 for time delaying the forward high frequency signal output from the forward frequency conversion and amplifying unit 513 according to the time delay control signal output from the forward control unit 514; A forward signal size control unit 511 for controlling the magnitude of the forward high frequency signal output from the forward time delay control unit 512 according to the signal size control signal output from the forward control unit 514; According to the phase control signal output from the forward control unit 514, the phase of the forward high frequency signal output from the forward signal magnitude control unit 511 is controlled in reverse phase so that the forward signal synthesizing unit 504 is a forward feedback signal removing signal. Forward phase control unit 510 for transmitting to.

In addition, the reverse feedback signal removing unit 529,

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 the feedback signal, a reverse reference signal is transmitted to the first signal synthesis and detection unit 501 in a frequency range in which the feedback signal is generated. A generated backward reference signal generator 527; A reverse reference signal detector 528 for filtering only a reference signal fed back from the reverse signal detected by the second signal synthesis and detector 508 and outputting the filtered reference signal to the reverse controller 526; 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 526 for generating a control signal for controlling the signal size and phase; Reverse frequency conversion and amplification unit 522 which restores the reverse intermediate frequency signal fed back through the first signal synthesis and detection unit 501 back to the original high frequency (RF) and amplifies the signal to the reverse time delay control unit 524. )Wow; A reverse time delay control unit 523 for time delaying the reverse high frequency signal output from the reverse frequency conversion and amplifying unit 522 according to the time delay control signal output from the reverse control unit 526; A reverse signal size control unit 524 for controlling the magnitude of the reverse high frequency signal output from the reverse time delay control unit 523 according to the signal size control signal output from the reverse control unit 526; According to the phase control signal output from the reverse control unit 526, the reverse signal synthesis unit 519 controls the phase of the reverse high frequency signal output from the reverse signal magnitude control unit 524 to the reverse phase by removing the reverse feedback signal. It consists of; the reverse phase control unit 525 to transmit to.

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 514 applies a control signal to the forward reference signal generator 516 to remove the forward feedback signal. The forward reference signal generator 516, which receives 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 508.

The second signal synthesis and detection unit 508 includes a first signal synthesis and detection unit 501, a first frequency separator 502, a forward amplification and frequency conversion unit 503, a forward signal synthesis unit 504, and a forward intermediate frequency. The forward signal processed by the processor 505, the forward frequency converter and amplifier 506, and the second frequency separator 507 and the forward reference signal are combined and transmitted to the mobile station through the second antenna 509.

In this case, the first frequency separator 502 frequency-separates the forward signal output from the first signal synthesis and detection unit 501 to the forward amplification and frequency conversion unit 503, so that the forward amplification and frequency conversion unit ( In 503, the forward signal separated by the first frequency separator 502 is amplified, converted into an intermediate frequency IF, and transmitted to the forward signal synthesizer 504.

Therefore, the forward signal synthesizing unit 504 outputs the forward signal output from the forward amplifying and frequency converting unit 503 in a phase controlled state from the forward phase control unit 510 in the forward feedback signal removing unit 517. The signals are synthesized and transmitted to the forward intermediate frequency signal processor 505.

Therefore, the forward intermediate frequency signal processing unit 505 filters, amplifies, and adjusts a signal converted from the signal output through the forward signal synthesis unit 504 to the intermediate frequency IF to perform a forward intermediate frequency signal. Since it is processed as a forward signal to be relayed to the forward frequency conversion and amplification unit 506, the forward intermediate frequency signal processed by the forward intermediate frequency signal processing unit 505 in the forward frequency conversion and amplification unit 506 again. After restoring to the original high frequency (RF) and amplifying and interfacing to the second frequency branching (507), the second frequency synthesizer (507) separates the forward signal to be relayed by intermediate frequency to separate the second signal synthesis and detection unit ( 508).

Meanwhile, the forward signal transmitted from the second antenna 509 is fed back through the first antenna 500 to the first signal synthesis and detection unit 501, and the first signal synthesis and detection unit 501 is input. As described above, the forward signal is transmitted to the first frequency separator 502 and at the same time, the reverse frequency conversion and amplification in the forward reference signal detector 515 and the reverse feedback signal remover 529 in the forward feedback signal remover 517. Transfer to section 522.

The forward reference signal detector 515 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 514.

Accordingly, the forward control unit 514 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 512, a signal size control signal is provided to the forward signal size control unit 511, and a phase control signal is provided to the forward phase control unit 510.

Meanwhile, the forward frequency conversion and amplifying unit 513 restores the forward intermediate frequency signal fed back through the second signal synthesizing and detecting unit 508 back to the original high frequency RF and then amplifies the forward time delay control unit 512. In this case, the forward time delay control unit 512 has a time delay of an intermediate frequency with respect to the forward signal output from the forward frequency conversion and amplifying unit 513 according to the input time delay control signal. It is adjusted to have the same time delay and transmitted to the forward signal size control unit 511.

The forward signal size control unit 511 always equals the magnitude of the forward intermediate frequency signal output from the forward time delay control unit 512 according to the signal size control signal output from the forward control unit 514. It is controlled to have it forwarded to the forward phase control unit 510.

Next, the forward phase control unit 510 phases the phase of the forward intermediate frequency signal output from the forward signal magnitude control unit 511 according to the phase control signal output from the forward control unit 514 so that the phase is always opposite to the feedback signal. The control unit transmits the control signal to the forward signal synthesis unit 504 as a forward feedback signal removal signal.

Then, the forward signal synthesizing unit 504 is a signal input through the first antenna 500, that is, a signal obtained by combining the forward signal and the feedback signal output from the base station and the forward signal output from the forward feedback signal removing unit 517. Only the pure forward signal from which the forward feedback signal is removed by synthesizing the feedback signal removal signal is transmitted to the forward intermediate frequency signal processor 505.

Accordingly, the forward intermediate frequency signal processing unit 505 filters, amplifies, and adjusts the signal converted to the intermediate frequency IF output through the forward signal synthesis unit 504 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 506, the forward frequency conversion and amplification unit 506 in the forward intermediate frequency signal processed by the forward intermediate frequency signal processor 505 again After restoring to the original high frequency RF, amplification is performed to interface with the second frequency branching 507.

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 526 applies a control signal to the reverse reference signal generator 527 to remove the reverse feedback signal. The reverse reference signal generator 527 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 time change of the feedback signal. To the first signal synthesis and detection unit 501.

The first signal synthesis and detection unit 501 includes a second signal synthesis and detection unit 508, a second frequency separator 507, a reverse amplification and frequency conversion unit 518, a reverse signal synthesis unit 519, and a reverse intermediate frequency. The backward signal processed by the processor 520, the forward frequency converter and amplifier 521, and the first frequency separator 502 and the backward reference signal are added together and transmitted to the base station through the first antenna 500.

In this case, the second frequency separator 507 frequency-separates the reverse signal output from the second signal synthesis and detection unit 508 and transmits the reverse signal to the reverse amplification and frequency conversion unit 518. In 518, the reverse signal separated by the second frequency separator 507 is amplified, converted into an intermediate frequency IF, and transmitted to the reverse signal synthesizer 519.

Accordingly, the reverse signal synthesizing unit 519 outputs the reverse signal output from the reverse amplifying and frequency converting unit 507 in a phase controlled state from the reverse phase control unit 525 in the reverse feedback signal removing unit 529. The signals are synthesized and transmitted to the reverse intermediate frequency signal processor 520.

Therefore, the reverse intermediate frequency signal processor 520 filters, amplifies, and adjusts a signal converted into the intermediate frequency IF from the signal output through the reverse signal synthesizer 520 to perform a reverse intermediate frequency signal. Process the reverse signal to be relayed to the reverse frequency conversion and amplification unit 521, so that the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processing unit 520 in the reverse frequency conversion and amplification unit 521 again. After restoring to the original high frequency (RF) and amplifying and interfacing to the first frequency branching (502), the first signal synthesizer and detection unit may be performed by separating the forward signal to be relayed by the first frequency separator (502). 501) will be delivered.

Meanwhile, the reverse signal transmitted from the first antenna 500 is fed back through the second antenna 509 to the second signal synthesis and detection unit 508, and the second signal synthesis and detection unit 508 is input. Forward frequency conversion in the reverse reference signal detector 528 and the forward feedback signal remover 517 in the reverse feedback signal remover 529 at the same time as transmitting the reverse signal to the second frequency separator 507 as described above. It transfers to the amplifier 513.

The reverse reference signal detector 528 converts the reverse signal transmitted from the above to an intermediate frequency, detects only a pure reference signal through a filtering function, and delivers the pure reference signal to the reverse controller 526.

Accordingly, the forward control unit 526 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 reverse time delay control unit 523, a signal size control signal is provided to the forward signal size control unit 524, and a phase control signal is provided to the forward phase control unit 525.

On the other hand, the forward frequency conversion and amplifying unit 522 restores the reverse intermediate frequency signal fed back through the first signal synthesizing and detecting unit 501 back to the original high frequency RF and then amplifies the reverse time delay control unit 523. In this case, the reverse time delay control unit 523 always transmits a time delay of an intermediate frequency with respect to the reverse signal output from the reverse frequency conversion and amplifying unit 522 according to the input time delay control signal. The same time delay is adjusted to be transmitted to the reverse signal size control unit 524.

The reverse signal size control unit 524 always adjusts the magnitude of the reverse intermediate frequency signal output from the reverse time delay control unit 523 according to the signal size control signal output from the reverse control unit 529. Control to have it passed to the reverse phase controller 525.

Next, the reverse phase control unit 525 phases the phase of the reverse intermediate frequency signal output from the reverse signal size control unit 524 to always be in phase opposite to the feedback signal according to the phase control signal output from the reverse control unit 526. The control unit transmits the control signal to the reverse signal synthesizing unit 519 as a reverse feedback signal removing signal.

Then, the reverse signal combiner 519 receives a signal input through the second antenna 500, that is, a signal obtained by combining the reverse signal and the feedback signal output from the base station and the reverse signal output from the reverse feedback signal remover 529. Only the pure forward signal from which the feedback signal removal signal is synthesized and the reverse feedback signal is removed is transmitted to the reverse intermediate frequency signal processor 520.

Accordingly, the reverse intermediate frequency signal processor 520 relays the forward intermediate frequency signal by filtering, amplifying, and adjusting a signal converted to the intermediate frequency IF output through the reverse signal synthesizer 519. The reverse frequency conversion and amplification unit 521 is transmitted to the reverse frequency conversion and amplification unit 521, so that the reverse intermediate frequency signal processed by the reverse intermediate frequency signal processor 520 is again used. After recovering to the original high frequency RF, amplification is performed to interface with the first frequency branching 502.

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 detects a part of the output signal and synthesizes the feedback signal according to the time change in the intermediate frequency signal processing units 505 and 520 to remove the feedback signal, and the signal fed back from the output antenna 509. Is input to the input antenna 500 and passed through the first signal synthesizing and detecting unit 1 (501) to be separated in the forward direction by the first frequency separator (502), and through the forward amplifying and frequency converting unit (503), an intermediate frequency signal. The signal is converted into and input to the forward signal synthesis unit 504.

On the other hand, a part of the output signal is detected by the second signal synthesizing and detecting unit 2 (508) is input to the forward feedback signal removing unit 517 is converted into an intermediate frequency signal by the forward frequency conversion and amplifying unit 513 and then amplified Each control unit controls the control unit by the change amount according to the time change of the feedback signal analyzed through the reference signal of the forward control unit 514 to obtain a time delay from the forward time delay control unit 512 and the signal magnitude from the forward signal size control unit 511. The phase is controlled by the forward phase controller 510 to output a feedback cancellation signal, and the feedback signal and the intermediate frequency are combined by the forward signal synthesis unit 504 to remove the feedback signal and always feedback even if the feedback signal changes with time. The signal is removed.

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, Amplifies the forward signal and converts it to an intermediate frequency (IF) to generate a reference signal for detecting the phase, signal magnitude and delay time variation according to the time change of the forward feedback signal, detects and analyzes the feedback forward reference signal, A forward feedback signal removal unit generating a forward feedback signal removal signal corresponding to the analysis result and removing the forward feedback signal; Amplify the reverse signal and convert it to the intermediate frequency (IF) to generate a reference signal for detecting the phase and signal magnitude and the delay time change according to the time change of the reverse feedback signal, detect and analyze the feedback reverse feedback signal, A reverse feedback signal removing unit generating a reverse feedback signal removing signal corresponding to the analysis result and 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 reverse feedback signal removing signal output from the reverse feedback signal removing unit and the forward signal 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 forward feedback signal removing signal and the reverse signal output from the forward 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 a signal output from the forward amplifying and frequency converting unit and a signal output in a phase controlled state from a forward phase control 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 signal output from the reverse amplifying and frequency converting unit and the signal output in a phase controlled state from the reverse phase control 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, 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 signal detected by the first signal synthesis 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 frequency converting and amplifying unit for restoring a forward intermediate frequency signal fed back through the second signal synthesizing and detecting unit back to an original high frequency (RF) and amplifying the signal to be forwarded to a forward time delay control unit; A forward time delay controller for delaying a forward high frequency signal output from the forward frequency converter and amplifier according to the time delay control signal output from the forward controller; 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; A forward phase control unit controlling a phase of a forward high frequency signal output from the forward signal size control unit in reverse phase according to the phase control signal output from the forward control unit, and forwarding the forward feedback signal removing signal to the forward signal synthesis unit; Active oscillation prevention device by the feedback signal of the wireless repeater for mobile communication. The method according to claim 1, 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 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 frequency converting and amplifying unit for restoring the reverse intermediate frequency signal fed back through the first signal synthesizing and detecting unit back to the original high frequency (RF) and amplifying the signal to be transmitted to the reverse time delay control unit; A reverse time delay control unit for time-delaying a reverse high frequency signal output from the reverse frequency conversion and amplifying 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; A reverse phase controller configured to control a phase of a reverse high frequency signal output from the reverse signal size control unit to a reverse phase according to the phase control signal output from the reverse control unit and transmit the reverse feedback signal removal signal to the reverse signal synthesis unit; Active oscillation prevention device by the feedback signal of the wireless repeater for mobile communication.