WO2011046339A2

WO2011046339A2 - Unitary repeater for cancelling feedback interference signals and cascade relay system using same

Info

Publication number: WO2011046339A2
Application number: PCT/KR2010/006957
Authority: WO
Inventors: 허재용
Original assignee: 주식회사 이알에이와이어리스
Priority date: 2009-10-12
Filing date: 2010-10-12
Publication date: 2011-04-21
Also published as: WO2011046339A9; WO2011046339A3; KR100954141B1

Abstract

The present invention relates to a unitary repeater for cancelling feedback interference signals and to a cascade relay system using the same. More particularly, the present invention relates to a cascade relay system using a unitary repeater for cancelling feedback interference signals, wherein the system ensures isolation between antennas using mutually different polarizing characteristics of a donor antenna and a service antenna, and has unitary repeaters for cancelling feedback interference signals, arranged into a cascade structure to provide a radio wave shadow area with optimum communication quality.

Description

Integrated repeater for eliminating feedback interference signal and multi-stage relay system using it

The present invention relates to an integrated repeater for removing a feedback interference signal and a multi-stage relay system using the same. More particularly, the present invention provides an isolation between antennas by using different polarization characteristics of a donor antenna and a service antenna, and provides a feedback interference signal. The present invention relates to a multi-stage relay system using an integrated repeater for eliminating feedback interference signals capable of providing optimal communication quality in a radio wave shading area by configuring an integrated repeater to remove and a plurality of the integrated repeaters in multiple stages.

The wireless repeater is installed in a radio shade area where it is difficult to install a base station to relay a signal between the base station and the mobile terminal, so that the mobile terminal can make a call even in the radio shadow area. Wireless repeaters are used to eliminate radio shadow areas in buildings, basements, tunnels, etc. in service areas. In order to solve the relatively small propagation shadow area, it is better to install the repeater than the base station in terms of cost and performance.

1 is a block diagram schematically illustrating a general repeater circuit.

The general repeater is received from two receiving duplexers (10, 20) having a transmitting end (Tx) and a receiving end (Rx) provided on both sides of the antenna (ANT), the receiving end (Rx) of one of the duplexers (10) After converting the RF signal from the low noise amplifier 11 and the low noise amplifier 11 which amplify the received signal while suppressing the noise in the signal to the intermediate frequency IF to improve the skirt characteristic, up-convert the original RF signal. Down and up converter (DUC1), a drive amplifier (12) for amplifying the RF signal from the down and up converter unit, and a high power amplifier (13) It is configured by.

Here, the down-and-up converter unit DUC1 includes a first RF SAW filter 14, an oscillation signal from the local oscillator LO, and a filter (1), which primarily improve the skirt characteristic of the RF signal input from the low noise amplifier 11. A first mixer 15 for downmixing the signal passing through 14 to generate an intermediate frequency, a line amplifier 16 for amplifying the signal from the first mixer 15 and an intermediate from the line amplifier 16; Line amplifier 16a for amplifying the intermediate frequency signal from the down converter unit 18 and the second RF SAW filter 14a, which are composed of the second RF SAW filter 14a for improving the skirt characteristic of the frequency signal, and the amplified frequency. A third RF SAW filter 17 for improving the skirt frequency characteristic of the signal, an oscillation signal from the local oscillator (LO) and the signal from the third RF SAW filter 17 are upmixed to generate an RF signal of an original size. Skirt of the RF mixer upmixed by the second mixer 15a and the second mixer 15a An up-converter section 19, which is composed of a fourth RF SAW filter 17a for improving the characteristics again, is provided.

By such a configuration, the specific RF signal input to the receiving end Rx of one duplexer 10 passes through the low noise amplifier 11 and the down-and-up converter DUC1, and the skirt characteristic is improved, and the driving amplifier 12 And it is restored to the original RF signal size via the high power amplifier 13, input to the transmitting terminal (Tx) of the other duplexer 20 and radiated to the outside through the antenna (ANT).

On the other hand, the RF signal received from the receiving end (Rx) of the duplexer 20 is a low noise amplifier 21 for amplifying the received signal while suppressing noise in the signal and the RF signal from the low noise amplifier 21 to the intermediate frequency (IF) A second down-and-converter (DUC2) which down-converts to improve the skirt characteristic and then up-converts to restore the original RF signal; driving to amplify the RF signal from this down-and-up converter It is input to the transmitting terminal Tx of the duplexer 10 via an amplifier 22 and a high power amplifier 23 and then radiated to the outside through the antenna ANT.

Here, the second down-and-up converter unit DUC2, like the converter DUC1 described above, has a first RF SAW filter 24 and a local oscillator that primarily improve the skirt characteristic of the frequency signal from the low noise amplifier 21. A first mixer 25 for downmixing the oscillation signal from LO and the signal passing through the filter 24 to generate an intermediate frequency, and a line amplifier 26 for amplifying the signal from the first mixer 25. And amplifying the intermediate frequency signal from the down converter section 28 comprising the second RF SAW filter 24a and the second RF SAW filter 24a for improving the skirt characteristic of the intermediate frequency signal from the line amplifier 26. Up the line amplifier 26a, the third RF SAW filter 27 for improving the skirt frequency characteristic of the amplified frequency signal, the oscillation signal from the local oscillator LO and the signal from the third RF SAW filter 27 A second mixer 25a for mixing and generating an RF signal of an original size; 2 consists of a mixer (25a) up-converter portion 29 consisting of the 4 RF SAW filter (27a) to improve the skirt characteristics in the up mixer from the RF signal.

Due to the increase of the wireless repeaters, the noise drawn in the reverse direction has also increased, and there is a problem that oscillation occurs according to the installation place or environment of the wireless repeaters. In the radio repeater, if the RF stage of the receiver and the RF stage of the transmitter are above a certain level, the signal of the service antenna is fed back into the donor antenna, and thus the repeater quality of the radio repeater is drastically degraded. In other words, it is necessary to secure the isolation between the donor antenna and the service antenna.

In addition, there is a need to secure the repeater quality by securing the above degree of isolation even in the case of connecting in multiple stages of the wireless relay period.

The present invention has been made to solve the above problems, an integrated repeater and a plurality of the feedback interference signal to remove the feedback interference signal to ensure the isolation between the antenna using different polarization characteristics of the donor antenna and the service antenna It is an object of the present invention to provide a multi-stage relay system using an integrated repeater for eliminating feedback interference signals that can provide an optimum communication quality in a radio-shaded area by configuring an integrated repeater for removing the multi-stage.

The integrated repeater for removing the feedback interference signal of the present invention for realizing the above object is a down converter unit for converting a high frequency signal received from a base station through a donor antenna into an intermediate frequency signal, and converts an intermediate frequency signal into a high frequency signal. An up-converter unit, an RF module unit consisting of a duplexer, a digital signal processing unit having a baseband signal to remove feedback interference signals, and a high-frequency signal through the up-converter unit to convert a high frequency signal to a mobile station through a service antenna. In the integrated repeater for removing the feedback interference signal sent out,

The donor antenna has four corresponding first, second, third and fourth radiating elements, one end of which is connected to the left and right sides of each of the first, second, third and fourth radiating elements, and the other end of the donor antenna A donor antenna comprising a microstrip type feed line connected to the duplexer and attached to one inner surface of the housing around the main body of the repeater to generate horizontal polarization, and the service antennas correspond to four corresponding fifth, sixth, and seventh antennas. , The eighth radiating element, one end of which is connected to the top and bottom surfaces of the fifth, sixth, seventh, and eighth radiating elements, and the other end includes a feed line of a microstrip type connected to a mobile station duplexer. A service antenna which is attached to the other inner surface of the housing and generates vertical polarization, and connects to the extension antenna through an RF switch located between the donor antenna and the service antenna and each duplexer. Input level and isolation to adjust the antenna's directing direction according to the propagation direction of the high frequency signal when it is connected to the digital signal processing unit having an external expansion donor antenna port and service antenna port and a means for canceling the feedback interference signal. Characterized in that it comprises an indicator.

In addition, the digital signal processor having a means for removing the feedback interference signal

The initial tap coefficient is set using the delay time and amplitude of the feedback signal obtained by using the correlation between the output signal of the A / D converter and the input signal of the D / A converter, and the convergence state of the initial tap coefficient is determined. Feedback signal delay time and isolation detection unit for detecting a signal and delay time of each feedback signal detected by the feedback signal delay time and isolation detection unit are generated and output to the adaptive filter sub-block calculation unit An adaptive filter for setting the initial tap coefficient of the output signal delay unit for allocating the sub-block of the adaptive filter only for the delay time, the feedback signal delay time, and the isolation detector as the tap coefficient of the sub-block, and then updating the adaptive filter coefficient. A sub-block updater and a filter coefficient updated by the adaptive filter sub-block updater and a reference signal output from the output signal delay unit; An adaptive filter subblock calculator for generating a feedback signal for each allocated subblock, a feedback signal generator for generating a final feedback signal by adding the feedback signals generated for each subblock in the adaptive filter subblock calculator, and the And an original signal detector configured to subtract the final feedback signal generated by the feedback signal generator and the output signal of the A / D converter to detect the original signal.

Multi-stage repeater system using an integrated repeater to remove the feedback interference signal of the present invention for realizing another object of the first bracket that can be fixed to the repeater in the horizontal direction outside the housing for protecting the repeater main board Or an integrated repeater for removing the first feedback interference signal installed horizontally or vertically by using a second bracket that can fix the repeater in the vertical direction to the installation, and an integrated repeater for removing the installed first feedback interference signal horizontally or vertically The integral repeater for removing the second feedback interference signal installed to intersect, the integral repeater for removing the first feedback interference signal, and the integral repeater for removing the second feedback interference signal are repeatedly installed so that horizontal or vertical crosses. Secure isolation between donor antenna and service antenna It is characterized by.

According to the integrated repeater for eliminating the feedback interference signal and the multi-stage relay system using the same, it is possible to secure isolation by using different polarizations between the donor antenna and the service antenna, and improve the relay quality by removing the feedback signal. Even when constructing a multi-stage relay system that connects the integrated repeaters to remove the interference signal, it is possible to secure optimal propagation characteristics when installing the radio repeater by installing them in the vertical direction or the horizontal direction according to the characteristics of the antenna radiating different polarizations. There is an advantage.

1 is a block diagram schematically showing a general repeater circuit,

2 is a block diagram of an integrated repeater for removing the feedback interference signal according to the present invention;

3 is a donor antenna configuration according to the present invention,

4 is a diagram illustrating a service antenna according to the present invention;

5 is a block diagram of a digital signal processing unit of an integrated repeater for removing a feedback interference signal using digital signal processing for allocating or canceling an adaptive filter subblock according to the present invention.

6 is an external view of an integrated repeater for removing a feedback interference signal having a first bracket and a second bracket according to the present invention;

7 is a block diagram of a multi-stage relay system using an integrated repeater for removing the feedback interference signal according to the present invention;

8 is a schematic diagram of a multi-stage relay system using an integrated repeater for removing a feedback interference signal using an external extension antenna port according to the present invention;

9 is a schematic diagram of input level and isolation indicators in accordance with the present invention.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an integrated repeater for removing the feedback interference signal according to the present invention.

Here, the description of the

converter units

300a, 300b, 400a, and 400b on the uplink or downlink side for converting the base station signal to the baseband is omitted since it is described in the background art section.

The integrated repeater for removing the feedback interference signal of the present invention is composed of four radiating elements in the form of microstrip, and a donor antenna 100 generating horizontal polarization, and four radiating elements in the form of microstrip to generate vertical polarization. External to which an external extension antenna can be connected using the service antenna 200, the base station RF switch 190 located between the donor antenna and the base station duplexer, and the mobile station RF switch 290 located between the service antenna and the mobile station duplexer. The expansion donor antenna port 180 and the service antenna port 280, and the input level and isolation indicator 900 for adjusting the directing direction of the antenna in accordance with the propagation direction of the high frequency signal.

3 is a diagram illustrating a donor antenna according to the present invention.

As shown in FIG. 3, the donor antenna 100 of the present invention includes four circular first, second, third, and fourth

radiating elements

110, 120, 130, and 140, and the first, second, third, and third agents. Feed lines (111, 112, 121, 122, 131, 132, 141, 142) for feeding the four radiating elements (110, 120, 130, 140) and the first feed unit 150 is connected to the duplexer of the base station. Since the shapes of the second, third, and fourth

radiating elements

120, 130, and 140 correspond to the shapes of the first radiating element 110, only the first radiating element will be described in detail here.

The first radiating element 110 has a first feed line 111 is connected to the left side of the first radiating element 110, the second feed line 112 is connected to the right side. Therefore, the propagation characteristics radiated by the first, second, third, and fourth radiating elements have a horizontal polarization characteristic.

When the power is supplied from the first feeder 150 connected to the duplex of the base station, the first divider 160 branches to the first and second

radiating elements

110 and 120 and the third and fourth

radiating elements

130 and 140. The first radiating element 110 and the second radiating element 120 branch from the second divider 161, and finally, the first feed line 111 and the second feed line 112 are separated from the third divider 162. Branched to the power supply to the first radiating element (110).

Here, when the lengths of the first feed line 111 and the second feed line 112 that are connected to the first radiating element 110 from the third distributor 162 are different (that is, the length of the second feed line is λ / 4), The length of the feeder wire is 3λ / 4) to achieve a 180 degree phase shift to fabricate a dual polarized antenna. Therefore, by improving the mutual separation of the dual polarization antenna, and having an array structure consisting of four radiating elements can improve the directivity and antenna efficiency.

4 is a configuration diagram of a service antenna according to the present invention.

As shown in FIG. 4, the service antenna 200 according to the present invention has four circular fifth, sixth, seventh, and

eighth radiating elements

210, 220, 230, and 240, and the fifth, sixth, seventh, and fifth agents.

Feed lines

211, 212, 221, 222, 231, 232, 241, 242 for feeding the eight radiating

elements

210, 220, 230, and 240, and a second feeder 250 connected to the duplexer of the mobile station. Since the shape of the sixth, seventh, and

eighth radiating elements

220, 230, and 240 corresponds to the shape of the fifth radiating element 210, only the fifth radiating element will be described in detail.

In the fifth radiating element 210, a fourth feed line 212 is connected to an upper surface of the fifth radiating element 210, and a third feed line 211 is connected to a lower surface of the fifth radiating element 210. Therefore, the propagation characteristics radiated by the fifth, sixth, seventh, and eighth radiating elements have vertical polarization characteristics.

When the power is supplied from the second feeder 250 connected to the duplex of the mobile station, first branching from the fourth distributor 260 to the fifth and sixth radiating

elements

210 and 220 and the seventh and

eighth radiating elements

230 and 240 is performed. The first radiating element 110 and the second radiating element 120 are branched at the fifth distributor 261, and finally, the third feeder 211 and the fourth feeder line 212 are disposed at the sixth distributor 262. Branched to and is fed to the fifth radiating element (210).

Here, when the lengths of the third feed line 211 and the fourth feed line 212 connected to the fifth radiating element 210 from the sixth distributor 262 are different (that is, the length of the fourth feed line is λ / 4), The length of the feeder wire is 3λ / 4) to achieve a 180 degree phase shift to fabricate a dual polarized antenna. Therefore, by improving the mutual separation of the dual polarization antenna, and having an array structure consisting of four radiating elements can improve the directivity and antenna efficiency.

The donor antenna 100 and the service antenna 200 are attached to one inner surface and the other surface of the housing centering on an integrated repeater body substrate for removing the feedback interference signal.

Hereinafter, the digital signal processor (500 of FIG. 2) for removing the feedback interference signal will be described.

The A / D converter functions to sample the analog signal input to the donor antenna at a specific sampling frequency and output a digital signal.

The feedback signal delay time and isolation detector 510 feeds back through the correlation between the output signal X _in (t) of the A / D converter and the output signal X _out (t) of the original signal detector 560. Detect the delay and amplitude of the signal.

Equation 1 below shows the correlation between X _in (t) and X _out (t).

[Equation 1]

Where n is the number of multipaths, a _i is the amplitude of the received impulse of the i th path, and T _i is the delay time of the i th arriving impulse.

Equation (1) the delay time (T _i) determined in the amplitude (a _i) the use of the feedback signal delay time, and isolated the initial tap coefficient and the delay of the initial adaptive filter (but not shown) included in the detector 510 Set the time. Thereafter, the initial adaptive filter performs an operation so that the correlation of Equation 1 is minimized so that the filter tap coefficient value converges to a specific value.

Thereafter, the feedback signal delay time and isolation detector 510 detects an isolation of the system from the converged filter coefficient values, and compares and determines the detected isolation with a reference value.

If the isolation is good, the delay time distribution of several feedback signals coming into the receiving antenna through the multipath is measured (scanned) by sequentially changing the initial delay time of the output time delay unit 550 to the maximum delay time allowed by the system. .

In addition, when the isolation is not good, it is determined whether to allocate a sub block of the adaptive filter unit 540 by operating each output time delay unit 550 according to the measured delay time distribution of each feedback signal.

The output signal delay unit 550 receives various inputs to the reception antenna through the multi-path output from the feedback signal delay time and the isolation detector 510 to the output signal X _out (t) of the original signal detector 560. Each reference signal X (n) having a respective delay time of the signal is generated and output to each subblock of the adaptive filter subblock calculator 520.

Next, the adaptive filter unit 540 includes an adaptive filter subblock updater 530 and an adaptive filter subblock calculator 520, and the allocated adaptive filter subblocks include a feedback signal delay time and an isolation detector. Information about the initial filter tap coefficient detected at 510 is received.

In addition, the adaptive filter unit 540 is instructed by the feedback signal delay time and isolation detector 510 to transmit the output value of each sub-block allocated by the adaptive filter unit to the feedback signal generator 570.

The adaptive filter subblock updater 530 has a structure for controlling the convergence speed according to the environment change rate of the feedback signal and the size of the service signal, and updates the coefficient of the adaptive filter. That is, a result obtained by subtracting a signal obtained by multiplying the filter tap coefficient by the output signal X _out (t) of the original signal detector 560 from the output signal delay unit 550 to the reference signal X (n). It consists of an algorithm for updating the filter coefficient value by using.

Here, the algorithm applied to the adaptive filter subblock updater 530 for updating the coefficients of the adaptive filter may use various types of algorithms such as a Least Mean Square (LMS) algorithm and a Minimun Mean Square Error (MNSE) algorithm. .

The adaptive filter subblock calculator 520 is a filter generated by the adaptive signal subblock updater 530 and the reference signal X (n) output from the output signal delay unit 520 for each subblock. A feedback signal is generated for each subblock by an internal algorithm multiplying the coefficient W.

Next, the feedback signal generator 570 generates the entire feedback signal by adding the feedback signals generated for each subblock by the adaptive filter subblock calculator 520.

Next, the original signal detector 560 detects the original signal by subtracting the entire feedback signal generated by the feedback signal generator 570 and the output signal in which the feedback signal is interfered with the original signal of the A / D converter.

Here, the original signal output from the original signal detector 560 generates noise components in an unwanted frequency band due to an instantaneous error component or a minute error of a service band. Accordingly, the noise component may be removed by adding a digital channel filter (not shown) after the original signal detector 560.

Here, the sub block is defined as one block having 8 or less taps of the adaptive filter, and the feedback signal is removed by sub-block units to remove the feedback signal. In one embodiment, one tap of the adaptive filter consists of eight taps based on an acceptable propagation delay of 20 nano-seconds, so that the ability to accommodate movement of the moving object is 160 nanoseconds in time. In this case, the feedback signal can be removed within a range of about 50 meters. Of course, the present invention does not limit the number of taps of the adaptive filter, but the number of taps constituting the subblock of the adaptive filter is preferably 8.

In general, since the system feedback signal is not continuous according to the environment and forms a different delay time and environment through multiple paths, even if continuous filter taps are used, the tap coefficient corresponding to the part where no feedback signal is weak or weak is very small. It does not affect system performance.

Accordingly, the present invention allocates the sub-blocks of the adaptive filter only to the delay time of the feedback signal to form a more efficient structure in the overall system configuration and eliminates unnecessary noise that may be generated by using continuous filter taps.

6 is an external view of an integrated repeater for removing a feedback interference signal having a first bracket and a second bracket according to the present invention.

As shown in FIG. 6, the first bracket 610 is connected to the repeater so as to fix the repeater horizontally to a structure (not shown) to which the repeater is to be installed. Alternatively, the second bracket 620 is connected to the repeater to fix the repeater in the vertical direction. This is to construct a multi-stage relay system using the following integrated repeater.

7 is a block diagram of a multi-stage relay system using an integrated repeater for removing the feedback interference signal according to the present invention. As shown in FIG. 7, the first bracket is installed in a horizontal direction in a structure to install an integrated repeater (a) that removes the first feedback interference signal received from the first base station. The service antenna of the integrated repeater (a) which removes the first feedback interference signal basically generates vertical polarization, but is installed in the horizontal direction by using the first bracket and thus the integrated repeater (a) which removes the first feedback interference signal (a). ) Service antenna transmits a horizontal polarization.

Next, the structure is to be installed in a vertical direction by using a second bracket to the structure to install the integrated repeater (b) to remove the second feedback interference signal. The donor antenna of the integrated repeater b that eliminates the second feedback interference signal receives horizontal polarization and the service antenna transmits vertical polarization.

Next, an integral repeater (c) for removing the third feedback interference signal is installed in the horizontal direction by using the first bracket so as to intersect 90 degrees with the integral repeater (b) for removing the second feedback interference signal at the front end.

That is, the donor antenna and the service antenna of the integrated repeater for removing the feedback interference signal generate different polarizations, so when the multi-stage relay system for connecting the integrated repeater for removing the feedback interference signal in multiple stages is isolated between the donor antenna and the service antenna. In order to ensure the integrated relay repeater to remove the first feedback interference signal and the integrated repeater to remove the second feedback interference signal may be repeatedly installed so that the horizontal or vertical cross to implement the optimum propagation environment.

8 is a schematic diagram of a multi-stage relay system using an integrated repeater that removes a feedback interference signal using an external extension antenna port according to the present invention.

In installing an integrated repeater that removes the first feedback interference signal and an integrated repeater that removes the second feedback interference signal, the donor antenna port or service antenna port for external extension is used when the line of sight is not secured. It is possible to secure the radio wave visibility.

That is, as shown in Figure 8, after connecting the RF switch located in the mobile station of the integrated repeater to remove the first feedback interference signal with the service antenna port for external expansion, the integrated signal to remove the second feedback interference signal to the service antenna port By connecting the donor antenna of the repeater and the expansion antenna 280 generating vertical or horizontal polarization at a position to secure the visible line of sight, the service area of the integrated repeater for removing the feedback interference signal can be widened.

As shown in Figure 9, when constructing a multi-stage relay system for connecting the integrated repeater to remove the feedback interference signal according to the multi-stage by directly confirming the indicator of the input level and isolation diagram according to the radio environment to the outside, When the repeater is installed, the installation can be optimized to adapt to the environment of the integrated repeater to remove the feedback interference signal is installed immediately.

Therefore, the use of different polarizations between the donor antenna and the service antenna ensures isolation, improves the relay quality by removing the feedback signal, and in constructing a multi-stage relay system that interconnects the repeaters that eliminate the feedback interference signal. By installing in the vertical direction or the horizontal direction according to the characteristics of the antenna that emits different polarizations, it is possible to secure the optimum propagation characteristics when installing a wireless repeater.

It is apparent to those skilled in the art that the present invention is not limited to the above embodiments and can be practiced in various ways without departing from the technical spirit of the present invention. will be.

Claims

Down converter unit for converting the high frequency signal received from the base station to the intermediate frequency signal through the donor antenna, an up converter unit for converting the intermediate frequency signal to the high frequency signal, an RF module unit composed of the duplexer, and processing the baseband signal A digital signal processing unit having a means for removing an interference signal and an integrated repeater for converting a high frequency signal through the up converter unit to remove the feedback interference signal sent to the mobile station through a service antenna,

The donor antenna has four corresponding first, second, third and fourth radiating elements, one end of which is connected to the left and right sides of each of the first, second, third and fourth radiating elements, and the other end of the donor antenna A donor antenna comprising a microstrip feed line connected to the duplexer and attached to one inner surface of the housing around the repeater main board to generate horizontal polarization.

The service antenna has four corresponding fifth, sixth, seventh and eighth radiating elements, one end of which is connected to the top and bottom surfaces of the fifth, sixth, seventh and eighth radiating elements, and the other end of the mobile station duplexer. Service antenna that includes a feed strip of the microstrip type connected to the main body substrate attached to the inner surface of the housing to generate a vertical polarization,

An external extension donor antenna port and a service antenna port for connecting to an extension antenna through an RF switch located between the donor antenna and the service antenna and each duplexer; and

Feedback interference signal comprising an input level and isolation indicator for adjusting the directing direction of the antenna in accordance with the propagation direction of the high frequency signal when connected to a digital signal processing unit having means for removing the feedback interference signal. Integral repeater to remove the.
The method of claim 1,

And the first, second, third, and fourth radiating elements and the fifth, sixth, seventh, and eighth radiating elements have a circular shape.
The method of claim 1,

Integrated repeater to remove the feedback interference signal to ensure the isolation between the antenna by performing a 180-degree phase shift by varying the length of the feed line connected to each radiating element of the donor antenna and the service antenna.
The method of claim 1,

A digital signal processor having means for removing the feedback interference signal

The initial tap coefficient is set using the delay time and amplitude of the feedback signal obtained by using the correlation between the output signal of the A / D converter and the input signal of the D / A converter, and the convergence state of the initial tap coefficient is determined. Feedback signal delay time and isolation detector for detecting

A reference signal having a delay time of each feedback signal detected by the feedback signal delay time and the isolation detector is generated and outputted to an adaptive filter subblock calculator to allocate a subblock of the adaptive filter only to the delay time of the feedback signal. Output signal delay unit,

An adaptive filter sub-block updating unit for updating the adaptive filter coefficient after setting the initial tap coefficient of the feedback signal delay time and the isolation detection unit as the tap coefficient of the sub-block;

An adaptive filter subblock calculator configured to generate a feedback signal for each allocated subblock by multiplying the filter coefficient updated by the adaptive filter subblock updater and a reference signal output from the output signal delay unit;

A feedback signal generator for generating a final feedback signal by adding the feedback signals generated for each subblock in the adaptive filter subblock calculator;

And an original signal detector configured to subtract the final feedback signal generated by the feedback signal generator and the output signal of the A / D converter to detect the original signal.
The method of claim 1,

The outside of the housing for protecting the repeater body substrate is characterized in that it comprises a first bracket for fixing the repeater in the horizontal direction to the repeater installation, and a second bracket for fixing the repeater in the vertical direction to the installation Integrated repeater to remove the feedback interference signal.
The outside of the housing for protecting the repeater main board is installed horizontally or vertically by using a first bracket that can fix the repeater to the repeater installation in the horizontal direction or a second bracket that can fix the repeater to the installation in the vertical direction. Integrated repeater to remove 1 feedback interference signal,

An integrated repeater for removing the first feedback interference signal installed to remove the second feedback interference signal installed so as to intersect horizontally or vertically;

The integrated repeater for removing the first feedback interference signal and the integrated repeater for removing the second feedback interference signal are repeatedly installed so as to intersect horizontally or vertically to secure the isolation between the donor antenna and the service antenna and to solve the radio shade region. Multi-stage relay system using an integrated repeater to remove the feedback interference signal.
The method of claim 6,

When the line of sight is not secured between the integrated repeater for removing the first feedback interference signal and the integrated repeater for removing the second feedback interference signal, an external extension donor antenna port or a service antenna port is used. Multi-stage relay system using an integrated repeater to remove the feedback interference signal, characterized in that to secure the visible line of sight by connecting the expansion antenna for generating a vertical or horizontal polarization.
The method of claim 6,

Feedback interference signal, characterized in that using the information displayed by the input level and isolation indicator for adjusting the directing direction of the antenna according to the propagation direction of the high frequency signal when installing the integrated repeater to remove the first and second feedback interference signal Multi-stage relay system using an integrated repeater to remove the.