KR100430375B1 - Active Oscillator Protection Device By Feedback Signal of Wireless Transmitter for Mobile Communication - Google Patents

Abstract

The present invention is coupled to the input portion of the wireless repeater under the control of the feedback signal removing unit and fed back to the signal synthesizer, and the output signal is fed back to the input antenna and input to the signal combining unit feedback feedback signal and the intermediate frequency (IF) By removing the feedback signal by synthesizing at a high frequency (RF) before the signal processing unit, the separation between antennas is increased to increase the output, and the oscillation phenomenon is eliminated, and the present invention provides the time of the forward or reverse feedback signal. 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, first and second frequency separators, first to third forward / reverse Amplification unit, a forward / backward signal detector, the forward / reverse signal combining unit, the forward / reverse frequency conversion, and by implementing in the intermediate frequency signal processing, removal of the feedback signal can be, and it is possible to improve the call quality.

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, the input portion of the wireless repeater is coupled to be fed back to the signal synthesizing unit under the control of the feedback signal removing unit, and the output signal is fed back to the input antenna and input to the signal synthesizing unit. The feedback elimination signal and the intermediate frequency (IF) signal processing unit are synthesized at high frequency (RF) so that the feedback signal is removed. 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 amplifying 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, by coupling the input portion of the wireless repeater under the control of the feedback signal removing unit to feed back to the signal synthesizing unit, the output signal is fed back to the input antenna and input to the signal synthesizing unit By removing the feedback signal by combining the feedback elimination signal and the intermediate frequency (IF) signal processing unit at high frequency (RF), it is possible to increase the separation between the antennas to increase the output and to eliminate the oscillation phenomenon.

"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 inputted through the forward signal detector and converts the signal 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, and the forward reference is fed back. A forward feedback signal removal unit for detecting and analyzing the signal, and generating a forward feedback signal removal signal corresponding to the analysis result to remove the forward feedback signal;

Amplifies the forward signal inputted through the backward signal detection unit and converts the signal 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 reverse feedback signal, and the feedback backward feedback. A reverse feedback signal removal unit for detecting and analyzing a signal and generating a reverse feedback signal removal signal corresponding to the analysis result to remove the reverse feedback signal;

A first frequency separator for receiving the signal transmitted from the base station through the first antenna and separating only the forward signal into frequency and transferring the signal to the first forward amplifier;

A first forward amplifier for low noise amplification of the forward high frequency signal input through the first frequency separator;

A forward signal detector for forwarding the low frequency amplified signal output through the first forward amplifier to a forward feedback signal remover and a second forward amplifier;

A second forward amplifier which amplifies the forward high frequency signal output from the forward signal detector again;

A forward reference signal input in a frequency range in which a feedback signal is generated in a forward high frequency signal input from the second forward amplifier and a forward phase control unit in the forward feedback signal canceling unit and a forward reference signal generator; A forward signal synthesizing unit for synthesizing with each other;

After converting the forward high frequency (RF) signal output from the forward signal synthesizing unit into an intermediate frequency (IF), the signal is filtered, amplified and gain adjustment is performed to process the original forward high frequency (RF) signal again. A frequency conversion and intermediate frequency signal processor;

A third forward amplifying unit which amplifies the forward high frequency signal inputted from the forward frequency converting and intermediate frequency signal processing unit and transmits the second high frequency signal to the mobile station through a second frequency separator and a second antenna;

A second frequency separator for receiving a signal transmitted from the mobile station through a second antenna and frequency separating only the reverse signal and transmitting the frequency to the first reverse amplifier;

A first reverse amplifying unit configured to low noise amplify a reverse high frequency signal input through the second frequency separator;

A reverse signal detector for transmitting a reverse high frequency signal, which is low noise amplified through the first reverse amplifier, to a reverse feedback signal remover and a second reverse amplifier;

A second reverse amplifier for amplifying the reverse high frequency signal output from the reverse signal detector again;

The reverse high frequency signal input from the second reverse amplifying unit and the high frequency feedback removing signal input from the reverse phase control unit in the reverse feedback signal removing unit and the reverse reference signal input into a frequency range in which the feedback signal is generated by the reverse reference signal generator A reverse signal synthesizing unit for synthesizing each other;

The reverse signal synthesis unit converts the reverse high frequency (RF) signal into an intermediate frequency (IF), and then filters, amplifies and adjusts the signal to reverse the original reverse high frequency (RF) signal. A frequency conversion and intermediate frequency signal processor;

And a third reverse amplifier for amplifying the reverse high frequency signal inputted from the reverse frequency converter and the intermediate frequency signal processor and transmitting the amplified signal to the base station through the first frequency separator and the first antenna.

In the above, the forward feedback signal removing unit,

Generation of a forward reference signal that generates a forward reference signal to the forward signal synthesizing 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 a phase, magnitude, and delay according to a time change of a feedback signal. Wealth;

A forward reference signal detector for filtering only a reference signal fed back from the forward signal detected by the forward signal 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 forward signal detecting unit back to an original high frequency (RF) and amplifying the forward intermediate delay signal 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,

Generation of a reverse reference signal generated by the reverse signal synthesizer with a reverse reference signal 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 a feedback signal. Wealth;

A reverse reference signal detector for filtering only a reference signal fed back from the reverse signal detected by the reverse signal detector to output 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 reverse signal detecting unit back to the original high frequency (RF) and amplifying and transmitting the amplified signal to a 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>

700, 709 ..... First and second antennas

701, 708 ..... first and second frequency separator

702, 704, 707 ....... The first to fourth forward amplifiers

703 ....... forward signal detector

705 ....... forward signal synthesis section

706 ....... Forward frequency conversion and intermediate frequency signal processor

714 ....... forward control

717 ....... Forward feedback signal canceller

718, 720, 723 ....... The first to fourth reverse amplification units

719 ....... Reverse signal detector

721 ....... Reverse signal synthesis section

722 ....... Reverse Frequency Conversion and Intermediate Frequency Signal Processing

728 ....... Forward control

731 ....... Forward 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 706 denotes a forward frequency conversion and an intermediate frequency signal processing unit, and an internal configuration may be used to perform all the signal processing processes until a signal through the first antenna 110 of FIG. 1 is output to the second antenna 150. Part, the operation is also the same as the operation described in FIG.

The signal received by the first antenna 700 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 709 to the first antenna 700 is forward. Since the magnitude, phase, and time delay of the output signal f1 'of the frequency converter and the intermediate frequency signal processor 706 continuously fluctuate with time, the forward feedback signal removing unit 717 performs a forward feedback signal. In order to remove the signal, a signal of -f is generated and transmitted to the forward signal synthesizer 705. The forward signal synthesizing unit 705 combines the output signal f1 and the feedback signal f of the base station received by the first antenna 700 in the internal synthesizer 705a and the feedback output from the forward feedback signal removing unit 717. The feedback signal is combined to remove the forward feedback signal, and only the pure base station output signal f1 is transmitted to the forward frequency conversion and intermediate frequency signal processor 706.

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 700 denotes a first antenna for receiving the forward signal transmitted from the base station, and reference numeral 717 denotes a phase and a signal magnitude according to time variation of the forward feedback signal in the forward signal input through the forward signal detector 703. And a forward feedback signal removing unit generating a reference signal for detecting a change in delay time, detecting and analyzing a forward reference signal fed back, and generating a forward feedback signal removing signal corresponding to the analysis result to remove the forward feedback signal. Indicates.

In addition, the reference numeral 731 generates a reference signal for detecting a phase, a signal magnitude, and a change amount of delay time according to the time change of the reverse feedback signal from the reverse signal input through the reverse signal detector 719, and the reverse reference signal fed back. Detects and analyzes the signal, and generates a reverse feedback signal removal signal corresponding to the analysis result to remove the reverse feedback signal.

In addition, the reference numeral 701 receives the signal transmitted from the base station through the first antenna 700 and separates only the forward signal to the first forward amplifying unit 702 and simultaneously sends the third reverse amplifying unit 723. Represents a first frequency separator for transmitting the reverse signal transmitted through the first antenna 700 to the base station, and reference numeral 708 receives the signal transmitted from the mobile station through the second antenna 709 to separate only the reverse signal frequency The second frequency divider transmits the forward signal transmitted through the third forward amplifier 707 to the mobile station through the second antenna 709 at the same time.

Reference numeral 702 denotes a first forward amplifying unit for low noise amplifying a high frequency signal input through the first frequency separator 701 at a predetermined level and transferring it to the forward signal detecting unit 703, and reference numeral 718 denotes the second forward amplifying unit. A first reverse amplification unit for low noise amplifying a high frequency signal input through the frequency separator 708 to a reverse level signal to the reverse signal detection unit 703.

In addition, reference numeral 703 denotes a forward signal for forwarding the high frequency signal, which is low noise amplified and output through the first forward amplifier 702, to the forward feedback signal remover 717 and the second forward amplifier 704, respectively. Denoted at 719, the reference numeral 719 transmits a reverse high frequency signal which is low noise amplified and output through the first reverse amplifier 718 to a reverse feedback signal remover 731 and a second reverse amplifier 720, respectively. The reverse signal detector is shown.

Further, reference numeral 704 denotes a second forward amplifier which amplifies the forward high frequency signal output from the forward signal detector 703 and forwards it to the forward signal synthesizer 705. Reference numeral 720 denotes the reverse signal detector ( A second reverse amplifying unit which amplifies the reverse high frequency signal output from 719 again and delivers the reverse high frequency signal to the reverse signal combining unit 721.

On the other hand, reference numeral 705 denotes a high frequency feedback cancellation signal and a forward reference signal generated by the forward high frequency signal input from the second forward amplifier 704 and the forward phase control unit 713 in the forward feedback signal removing unit 717. A forward signal synthesizing unit 716 synthesizes forward reference signals input in a frequency range where a feedback signal is generated to remove feedback signals, and forwards them to a forward frequency converting and intermediate frequency signal processing unit 706. The high frequency feedback cancel signal and the reverse reference signal generator 7730 input from the reverse high frequency signal input from the second reverse amplifier 720 and the reverse phase control unit 727 in the reverse feedback signal remover 731 After removing the feedback signal by synthesizing the backward reference signals inputted in the frequency range where the feedback signal is generated, It represents parts of the reverse signal synthesis for transmitting a direction frequency conversion and intermediate frequency signal processing unit 722.

In addition, reference numeral 706 converts a forward high frequency (RF) signal output from the forward signal synthesizing unit 705 to an intermediate frequency (IF), and then filters, amplifies, and adjusts the original signal to reconstruct the original forward direction. A forward frequency converter and an intermediate frequency signal processor for processing a high frequency (RF) signal and delivering the same to the third forward amplifier 707, and reference numeral 722 denotes a reverse high frequency RF output from the reverse signal synthesizer 721. After converting the signal to an intermediate frequency (IF), the signal is filtered, amplified, and gain-adjusted to be processed again as an original reverse high frequency (RF) signal, and then transferred to the third reverse amplification unit 723. And an intermediate frequency signal processor.

Further, reference numeral 707 denotes a third that amplifies the forward high frequency signal input from the forward frequency conversion and intermediate frequency signal processing unit 706 and transmits it to the mobile station through the second frequency separator 708 and the second antenna 709. Reference numeral 723 denotes a forward amplifier, and amplifies the reverse high frequency signal input from the reverse frequency conversion and intermediate frequency signal processing unit 722 again and transmits it to the base station through the first frequency separator 701 and the first antenna 700. The third reverse amplification unit is shown.

The forward feedback signal removing unit 717,

According to the control signal to generate a reference signal that can measure the phase, magnitude and delay of the feedback signal according to the time change of the feedback signal, a forward reference signal is generated to the forward signal synthesizer 705 in a frequency range in which the feedback signal is generated. A forward reference signal generator 716; A forward reference signal detector 715 for filtering only a reference signal fed back from the forward signal detected by the forward signal detector 703 to be output to the forward controller 714; 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 714 for generating a control signal for controlling the signal size and phase; A forward frequency converting and amplifying unit 710 for restoring a forward intermediate frequency signal fed back through the forward signal detecting unit 703 back to an original high frequency (RF) and amplifying the signal to a forward time delay control unit 711; A forward time delay control unit 711 for time delaying the forward high frequency signal output from the forward frequency conversion and amplifying unit 710 according to the time delay control signal output from the forward control unit 714; A forward signal size control unit 712 for controlling the magnitude of the forward high frequency signal output from the forward time delay control unit 711 according to the signal size control signal output from the forward control unit 714; According to the phase control signal output from the forward control unit 714, the phase of the forward high frequency signal output from the forward signal magnitude control unit 712 is controlled in reverse phase so that the forward signal synthesizing unit 705 is a forward feedback signal removing signal. Forward phase control unit 713 to transmit to.

In addition, the reverse feedback signal removing unit 731,

According to the control signal for generating a reference signal for measuring the phase, magnitude and delay of the feedback signal over time, a reverse reference signal is generated to the reverse signal synthesizer 721 in a frequency range in which the feedback signal is generated. A backward reference signal generator 730; A reverse reference signal detector 729 for filtering only a reference signal fed back from the reverse signal detected by the reverse signal detector 719 to output to the reverse controller 728; 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 728 for generating a control signal for controlling the signal size and phase; A reverse frequency conversion and amplifying unit 724 for restoring the reverse intermediate frequency signal fed back through the reverse signal detector 719 back to the original high frequency (RF) and amplifying the signal to be transmitted to the reverse time delay control unit 725; A reverse time delay control unit 725 for time delaying the reverse high frequency signal output from the reverse frequency conversion and amplifying unit 724 according to the time delay control signal output from the reverse control unit 728; A reverse signal size control unit 726 for controlling the magnitude of the reverse high frequency signal output from the reverse time delay control unit 725 according to the signal size control signal output from the reverse control unit 728; According to the phase control signal output from the reverse control unit 728, the reverse signal synthesis unit 721 as a reverse feedback signal removal signal by controlling the phase of the reverse high frequency signal output from the reverse signal size control unit 726 to reverse phase. It consists of; reverse phase control unit 727 to pass to.

Active oscillation prevention device by the feedback signal of the mobile repeater according to the present invention configured as described above, the feedback signal is removed separately for the forward link and the reverse link, in 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 714 applies a control signal to the forward reference signal generator 716 to remove the forward feedback signal. The forward reference signal generator 716 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 time change of the feedback signal. To the forward signal synthesizer 705.

Meanwhile, since the forward signal transmitted from the second antenna 709 is fed back through the first antenna 700 and transmitted to the first frequency separator 701, the first antenna 700 in the first frequency separator 701. Only the forward signal received from the base station through the frequency separation is transmitted to the first forward amplifier 702, and at the same time the reverse signal transmitted through the third reverse amplifier 723 to the base station through the first antenna 700 Will be sent.

Therefore, the first forward amplifier 702 low noise amplifies the forward high frequency signal input through the first frequency separator 701 to a predetermined level and transmits it to the forward signal detector 703, and receives the forward direction. As the signal detecting unit 703 forwards the forward high frequency signal to the forward feedback signal removing unit 717 and the second forward amplifying unit 704, the second forward amplifying unit 704 transmits the forward high frequency signal. Amplified again and forwarded to the forward signal synthesizer 705.

Meanwhile, the forward reference signal detector 715 in the forward feedback signal remover 717 that receives the forward high frequency signal from the forward signal detector 703 converts the forwarded signal into an intermediate frequency and performs a filtering function. Only the pure reference signal is detected and transmitted to the forward controller 714.

Accordingly, the forward control unit 714 calculates the time delay, the signal magnitude, and the phase change amount according to the 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 711, a signal size control signal is provided to the forward signal size control unit 712, and a phase control signal is provided to the forward phase control unit 713.

In addition, in the forward frequency signal conversion unit 710 in the forward feedback signal removing unit 717 which receives the forward high frequency signal from the forward signal detection unit 703, the forward intermediate frequency signal fed back through the forward signal detection unit 703. Since it is restored to the original high frequency (RF) and amplified and forwarded to the forward time delay control unit 711, the forward time delay control unit 711 is the forward frequency conversion and amplification unit according to the input time delay control signal The time delay of the intermediate frequency with respect to the forward signal output from the 710 is adjusted to always have the same time delay as the feedback signal and transmitted to the forward signal size control unit 712.

The forward signal size control unit 712 always equals the magnitude of the forward intermediate frequency signal output from the forward time delay control unit 711 according to the signal size control signal output from the forward control unit 714. Control to have a forward phase control unit 713.

Next, the forward phase control unit 713 phases the phase of the forward intermediate frequency signal output from the forward signal magnitude control unit 712 to be always opposite to the feedback signal according to the phase control signal output from the forward control unit 714. The control unit transmits the control signal to the forward signal synthesis unit 705 as a forward feedback signal removal signal.

Accordingly, the feedback cancel signal of the high frequency input from the forward phase control unit 713 in the forward feedback signal canceling unit 717 and the forward high frequency signal input from the second forward amplifier 704 by the forward signal synthesis unit 705. And a forward reference signal generated by the forward reference signal generator 716 to remove the feedback signal, and then forward the signal to the forward frequency converter and the intermediate frequency signal processor 706, so that the forward frequency converter and the intermediate frequency signal processor ( In step 706, the synthesized forward RF signal is converted to an intermediate frequency IF, the signal is filtered, amplified, and gain adjusted to be processed again into the original forward RF signal, thereby processing the third forward frequency. It is transmitted to the amplifier 707.

Therefore, the third forward amplifier 707 amplifies the forward high frequency signal input from the forward frequency converter and the intermediate frequency signal processor 706 again through the second frequency separator 708 and the second antenna 709. It is sent to the mobile station.

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 728 applies a control signal to the reverse reference signal generator 730 to remove the reverse feedback signal. The reverse reference signal generator 730 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 reverse signal synthesizing unit 721.

Meanwhile, since the forward signal transmitted from the second antenna 709 is fed back through the first antenna 700 and transmitted to the first frequency separator 701, the first antenna 700 in the first frequency separator 701. Only the forward signal received from the base station through the frequency separation is transmitted to the first forward amplifier 702, and at the same time the reverse signal transmitted through the third reverse amplifier 723 to the base station through the first antenna 700 Will be sent.

Therefore, the first forward amplifier 702 low noise amplifies the forward high frequency signal input through the first frequency separator 701 to a predetermined level and transmits it to the forward signal detector 703, and receives the forward direction. As the signal detecting unit 703 forwards the forward high frequency signal to the forward feedback signal removing unit 717 and the second forward amplifying unit 704, the second forward amplifying unit 704 transmits the forward high frequency signal. Amplified again and forwarded to the forward signal synthesizer 705.

Meanwhile, the reverse reference signal detector 729 in the reverse feedback signal remover 731 which receives the reverse high frequency signal from the reverse signal detector 719 converts the transmitted reverse signal into an intermediate frequency and performs a filtering function. Only pure reference signals are detected and transmitted to the backward control unit 728.

Accordingly, the backward control unit 728 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, the time delay control signal is provided to the reverse time delay control unit 725, the signal size control signal is provided to the reverse signal size control unit 726, and the phase control signal is provided to the reverse phase control unit 727.

In addition, the reverse frequency converter and the amplification unit 724 in the reverse feedback signal removing unit 731 which receives the reverse high frequency signal from the reverse signal detector 719 receives the reverse intermediate frequency signal fed back through the reverse signal detector 719. Since it is restored to the original high frequency (RF) and then amplified and transmitted to the reverse time delay control unit 725, the reverse time delay control unit 725 is the reverse frequency conversion and amplification unit according to the input time delay control signal. The time delay of the intermediate frequency with respect to the reverse signal output from the 724 is adjusted to always have the same time delay as the feedback signal is transmitted to the reverse signal size control unit 726.

The reverse signal size control unit 726 may always adjust the magnitude of the reverse intermediate frequency signal output from the reverse time delay control unit 725 according to the signal size control signal output from the reverse control unit 731 to always have the same magnitude as the feedback signal. Control to have it passed to the reverse phase control unit 727.

Next, the forward phase control unit 727 phases the phase of the reverse intermediate frequency signal output from the reverse signal size control unit 726 according to the phase control signal output from the reverse control unit 728 so that the phase is always opposite to the feedback signal. The control unit transmits the control signal to the reverse signal synthesis unit 519 as a reverse feedback signal removal signal.

Accordingly, the reverse frequency synthesizing unit 719 receives the reverse high frequency signal input from the second reverse amplifier 720 and the high frequency feedback removing signal input from the reverse phase control unit 727 in the reverse feedback signal removing unit 731. And the backward reference signal generated by the backward reference signal generator 730 to remove the feedback signal, and then transfer the reverse frequency conversion and intermediate frequency signal processing unit 722 to the reverse frequency conversion and intermediate frequency signal processing unit ( In step 722, the synthesized reverse high frequency (RF) signal is converted to an intermediate frequency (IF), filtered, amplified, and gain-adjusted, and then processed again into the original reverse high frequency (RF) signal, thereby processing a third reverse direction. The amplifier 723 is delivered to the amplifier.

Therefore, the third reverse amplifier 723 amplifies the reverse high frequency signal input from the reverse frequency converter and the intermediate frequency signal processor 722 again through the first frequency separator 701 and the first antenna 700. It is sent to the base station.

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 input signal, detects the feedback signal according to the time change after the first forward amplifier 702, and synthesizes the feedback signal before the forward frequency conversion and the intermediate frequency signal processor 706. As a device for removing the signal, the signal transmitted from the base station is received by the receiving antenna 700 and is forward-selected by the first frequency separator 701 and input to the first forward amplifier 702.

Here, the low noise amplification of the forward signal is input to the second forward amplifier 704 via the forward signal detection unit 703, amplifies the input signal, and then forward frequency conversion through the forward signal synthesis unit 705. And an intermediate frequency signal processor 706.

In this case, the intermediate frequency signal is converted, and the converted intermediate frequency signal is filtered and then amplified, and then converted to a high frequency signal to be input to the third forward amplifier 707 and amplified.

Then, after passing through the second frequency separator 708, it is outputted to the output antenna 709 and transmitted to the mobile station, where a part of the transmitted signal is fed back and received by the input antenna 700 to receive the first frequency separator 701. Input to the forward signal synthesizer 705 via a first forward amplifier 702, a forward signal detector 703, and a second forward amplifier 704, where the output of the forward feedback signal remover 717 is The feedback signal is removed by combining the high feedback cancellation signal and the high frequency signal.

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

Of course, the reverse signal is made in the opposite direction as described above.

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. The active oscillation preventing device based on the feedback signal can be selectively selected as the forward feedback removing 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 inputted through the forward signal detector and converts the signal 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, and the forward reference is fed back. A forward feedback signal removal unit for detecting and analyzing the signal, and generating a forward feedback signal removal signal corresponding to the analysis result to remove the forward feedback signal; Amplifies the forward signal inputted through the backward signal detection unit and converts the signal 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 reverse feedback signal, and the feedback backward feedback. A reverse feedback signal removing unit for detecting and analyzing the signal, and generating a reverse feedback signal removing signal corresponding to the analysis result to remove the reverse feedback signal; A first frequency separator for receiving the signal transmitted from the base station through the first antenna and separating only the forward signal into frequency and transferring the signal to the first forward amplifier; A first forward amplifier for low noise amplification of the forward high frequency signal input through the first frequency separator; A forward signal detector for forwarding the low frequency amplified signal output through the first forward amplifier to a forward feedback signal remover and a second forward amplifier; A second forward amplifier which amplifies the forward high frequency signal output from the forward signal detector again; A forward reference signal input in a frequency range in which a feedback signal is generated in a forward high frequency signal input from the second forward amplifier and a forward phase control unit in the forward feedback signal canceling unit and a forward reference signal generator; A forward signal synthesizing unit for synthesizing with each other; After converting the forward high frequency (RF) signal output from the forward signal synthesizing unit into an intermediate frequency (IF), the signal is filtered, amplified and gain adjustment is performed to process the original forward high frequency (RF) signal again. A frequency conversion and intermediate frequency signal processor; A third forward amplifying unit which amplifies the forward high frequency signal inputted from the forward frequency converting and intermediate frequency signal processing unit and transmits the second high frequency signal to the mobile station through a second frequency separator and a second antenna; A second frequency separator for receiving a signal transmitted from the mobile station through a second antenna and frequency separating only the reverse signal and transmitting the frequency to the first reverse amplifier; A first reverse amplifying unit configured to low noise amplify a reverse high frequency signal input through the second frequency separator; A reverse signal detector for transmitting a reverse high frequency signal, which is low noise amplified through the first reverse amplifier, to a reverse feedback signal remover and a second reverse amplifier; A second reverse amplifier for amplifying the reverse high frequency signal output from the reverse signal detector again; The reverse high frequency signal input from the second reverse amplifying unit and the high frequency feedback removing signal input from the reverse phase control unit in the reverse feedback signal removing unit and the reverse reference signal input into a frequency range in which the feedback signal is generated by the reverse reference signal generator A reverse signal synthesizing unit for synthesizing each other; The reverse signal synthesis unit converts the reverse high frequency (RF) signal into an intermediate frequency (IF), and then filters, amplifies and adjusts the signal to reverse the original reverse high frequency (RF) signal. A frequency conversion and intermediate frequency signal processor; And a third reverse amplifying unit which amplifies the reverse high frequency signal inputted from the reverse frequency converting and intermediate frequency signal processing unit and transmits the reverse high frequency signal to the base station through the first frequency separator and the first antenna. Active oscillation prevention device by feedback signal. The method according to claim 1, The forward feedback signal removing unit, Generation of a forward reference signal that generates a forward reference signal to the forward signal synthesizing 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. Wealth; A forward reference signal detector for filtering only a reference signal fed back from the forward signal detected by the forward signal 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 forward signal detecting unit back to an original high frequency (RF) and amplifying the forward intermediate delay signal 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, The reverse feedback signal removing unit, Generation of a reverse reference signal generated by the reverse signal synthesizer with a reverse reference signal 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 a feedback signal. Wealth; A reverse reference signal detector for filtering only a reference signal fed back from the reverse signal detected by the reverse signal detector to output 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 reverse signal detecting unit back to the original high frequency (RF) and amplifying and transmitting the amplified signal to a 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.