KR20060099846A - Apparatus and method for removing interference noise of rf repeater system - Google Patents

Abstract

The present invention solves the problem that the transmission signal of the wireless repeater is re-input to the receiving antenna by using an adaptive compensation algorithm in real time, and additionally configures a multipath searcher for the signal for the transmission signal being re-input to the receiving antenna. The present invention relates to an interference noise canceling apparatus and method for a wireless repeater system capable of actively responding to changes in an external environment by using an adaptive compensation algorithm for a path input after measuring a noise ratio for each path, and having a value greater than a reference value. First frequency converting means for down-converting the frequency of the received signal, adaptive interference noise removing means for removing interference noise included in an output signal of the first frequency converting means using an adaptive compensation algorithm, and the adaptive Up-converts the output signal of the type interference noise canceling unit to the operating frequency, And a second frequency converting means for receiving a signal coupled from an end of the transmitting means and converting the frequency down to provide a reference signal of the adaptive interference noise removing means. .

Adaptive Compensation Algorithm, Coupling, Interference Noise, Multipath Search Means

Description

Apparatus and method for removing interference noise of RF repeater system

1 is a conceptual diagram illustrating a general wireless repeater system

2 is a block diagram illustrating an interference noise canceling device of a wireless repeater system according to a first embodiment of the present invention;

3 is a block diagram of an adaptive interference noise removing unit shown in FIG.

4 is a diagram illustrating a signal processing configuration for explaining an interference noise removing apparatus of a wireless repeater system according to a first embodiment of the present invention.

FIG. 5 is a block diagram illustrating an interference noise canceling device of a wireless repeater system when a multipath search unit is additionally configured in a first embodiment of the present invention; FIG.

FIG. 6 is a block diagram illustrating the configuration of the multipath search unit shown in FIG.

7 is a flowchart illustrating a method for removing interference noise of a wireless repeater system according to a first embodiment of the present invention.

8A to 8B are flowcharts for describing a method for removing interference noise of a wireless repeater system when the multipath search step is additionally performed in the first embodiment of the present invention.

9 is a block diagram illustrating an interference noise canceling device of a wireless repeater system according to a second embodiment of the present invention.

10A to 10B are block diagrams of the forward and reverse adaptive interference noise removing means.

FIG. 11 is a block diagram illustrating an interference noise removing apparatus of a wireless repeater system when a multipath searching unit is additionally configured in a second embodiment of the present invention; FIG.

12A to 12B are block diagrams of the forward and reverse multipath search means shown in FIG.

13 is a flowchart illustrating a method of canceling interference noise in a wireless repeater system according to a second embodiment of the present invention.

14A to 14B are flowcharts for describing a method of removing interference noise of a wireless repeater system when a multipath search step is additionally performed in a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

21a, 21b: first and second transmit / receive antennas 23, 23a, 23b: first frequency converting means

25 transmission means 25a forward transmission means

25b: reverse transmission means 27: adaptive interference noise removing means

27a: forward adaptive interference noise removing means

27b: backward adaptive interference noise removing means

29, 29a, 29b: second frequency conversion means 31: coupling means

31a and 31b: first and second coupling means 41, 41a and 41b: adaptive compensation algorithm unit

43,43a, 43b: adaptive interference cancellation filter 45,45a, 45b: interference cancellation

51: multipath search means 51a: forward multipath search means

51b: reverse multipath search means 61, 61a, 61b: time delay adjustment unit

63,63a, 63b: Correlator 65,65a, 65b: Integrator

67,67a, 67b: comparator 69,69a, 69b: multipath interference noise determiner

71, 71a, 71b: memory unit 100a: forward interference cancellation device

100b: reverse interference noise canceller

The present invention relates to an apparatus and a method for canceling interference of a signal, and more particularly, to solve a problem caused by the re-input of a signal output through a transmitting antenna to a receiving unit. An input interference noise canceller and method are described.

In general, the communication wireless repeater 11 is installed in a place where the signal output from the base station 13 is weak, as shown in FIG. 1, after amplifying the weak signal and outputting it to the terminal 15, thereby providing a higher quality. It is installed and operated for the purpose of providing communication service.

Repeaters that perform these functions can be divided into optical repeaters connected wirelessly between the base station and the repeater and wireless repeaters connected wirelessly. The optical repeaters can maintain good call quality because they are connected by wires between the base stations and the repeaters. On the other hand, it is expensive compared to a wireless repeater, in particular, there is a problem in that the cost of installing or renting an optical cable is excessively required.

On the other hand, the wireless repeater has the advantage that the installation or operation cost is low, unlike the optical repeater is connected by wire, while the transmission signal transmitted through the transmitting antenna of the wireless repeater is received by the receiving antenna is input back to the signal Problems such as interference or oscillation have occurred. For this reason, the wireless repeaters used in mobile communication repeaters are currently used as low power systems such as communication services in buildings.

In order to solve the problem of the wireless repeater, there has been proposed a method of increasing the signal separation by securing a sufficiently wide distance between the frequency conversion repeater and the antenna, but the frequency conversion repeater uses the same frequency for the transceiver. In order to prevent the oscillation problem, it is necessary to use the frequency conversion repeater that uses the transmission frequency and the reception frequency of the radio repeater differently. There is a problem that can not be used, etc., when the separation distance between the antenna to increase the signal separation degree, there was a problem that the installation cost and maintenance is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the wireless signal which can improve the call quality by effectively removing the interference noise from which the transmission signal is re-inputted through the receiving antenna using an adaptive compensation algorithm operating in real time. It is an object of the present invention to provide an interference noise canceling apparatus and method for a repeater system.

Another object of the present invention is to extract the signal-to-noise ratio for the transmission signal re-input through the receiving antenna of the radio repeater for each path by using the multipath searcher, and then use only the adaptive compensation algorithm to input the path with a value larger than the reference value. The present invention provides an apparatus and method for removing interference noise of a wireless repeater system capable of removing interference signals.

It is still another object of the present invention to provide an apparatus and method for removing interference interference of a wireless repeater system which can improve communication service quality by extending coverage of a repeater.

In an interference noise canceling apparatus of a wireless repeater system of the present invention for achieving the above object, in the interference noise canceling apparatus of a wireless repeater system for relaying a broadcast signal transmitted in one direction between a first transmission and reception antenna and a second transmission and reception antenna, Adaptive interference for down-converting the frequency of the signal received by the first transmit / receive antenna and adaptive interference algorithm to remove interference noise included in the output signal of the first frequency converting means. A noise canceling means, a transmission means for up-converting the output signal of the adaptive interference noise canceling means to an operating frequency, adjusting a transmission level, and down-converting the frequency by receiving a feedback signal coupled from an end of the transmission means; Second frequency converting means for providing a reference signal of the adaptive interference noise removing means It is characterized by comprising. Here, the coupling means further comprises a coupling means for coupling the output signal of the transmission means at the end of the transmission means to the second frequency conversion means.

In addition, the interference noise canceling apparatus of the wireless repeater system according to the embodiment of the present invention is characterized in that the adaptive interference noise canceling means is applied to the output signal of the first frequency converting means using the signal input from the second frequency converting means as a reference signal. An adaptive compensation algorithm unit for extracting the characteristic value of the interference noise included, an adaptive interference cancellation filter unit for outputting only the interference noise by applying the characteristic value extracted by the adaptive compensation algorithm unit, and the first frequency And an interference canceling unit for removing the interference noise output from the adaptive interference canceling filter unit from the output signal of the converting unit and outputting the interference noise to the transmitting unit.

In addition, the interference noise canceling apparatus of the wireless repeater system according to the embodiment of the present invention uses the output signal of the first frequency conversion means and the output signal of the second frequency conversion means to the output signal of the first frequency conversion means. And multipath searching means for searching for a path having a signal-to-noise ratio greater than a reference value among the interference noises included in the multipath.

On the other hand, the interference noise canceling device of the wireless repeater system according to another embodiment of the present invention, the interference between the first transmission and reception antennas and the second transmission and reception antennas to remove the forward and reverse interference noise in the wireless repeater system The apparatus of claim 1, wherein the interference interference included in the signal received by the first transmit / receive antenna is removed by using a signal coupled at the front end of the second transmit / receive antenna and a forward adaptive compensation algorithm. And a reverse interference noise canceller which removes the interference noise included in the signal received by the transmit / receive antenna through a signal coupled in front of the first transmit / receive antenna and a backward adaptive compensation algorithm. The apparatus for canceling forward interference noise isolates a signal received through the first transmit / receive antenna from a transmission signal and provides a coupling signal used as a reference signal to remove interference noise in the reverse interference noise canceller. A first transmission means, a first frequency conversion means for down-converting the frequency of the signal output from the first coupling means, and an interference noise included in the output signal of the first frequency conversion means; A forward adaptive interference noise canceling means for canceling the signal coupled at the front end of the signal using an adaptive compensation algorithm, and an output signal of the forward adaptive interference noise canceling means up-converting to an operating frequency and adjusting a transmission level A forward transmission means and a signal coupled at the end of the forward transmission means to receive a feedback A second frequency converting means which is down-converted and provided as a reference signal of the forward adaptive interference noise removing means, and is connected to an end of the forward transmitting means, outputs a coupling signal to the second frequency converting means, and transmits a second transmit / receive antenna And second coupling means for isolating a signal received through the transmission signal.

The apparatus for canceling backward interference may include first frequency converting means for downconverting a frequency of a signal output from the second coupling means, and interference noise included in an output signal of the first frequency converting means. 1, the backward adaptive interference noise canceling means for removing the signal coupled by the coupling means and the adaptive compensation algorithm, and the output signal of the backward adaptive interference noise canceling means up-converted to the operating frequency, the transmission level And a second frequency converting means for receiving a feedback signal coupled at the end of the reverse transmitting means and down converting the frequency to provide a reference signal of the reverse adaptive interference noise removing means. It is characterized by.

The apparatus for canceling forward and reverse interference noise is an adaptive type which extracts characteristic values of interference noise included in an output signal of the first frequency converting means by using the signal input from the second frequency converting means as a reference signal. An adaptive interference cancellation filter unit for outputting only the interference noise by applying a compensation algorithm unit, a characteristic value extracted from the adaptive compensation algorithm unit, and the adaptive interference cancellation filter unit in the output signal of the first frequency conversion unit; Characterized in that it comprises an interference cancellation unit for removing the interference noise output from.

The apparatus for canceling forward and backward interference noise may include a reference value among the interference noises on the multipaths included in the first frequency conversion means by using the output signal of the first frequency conversion means and the output signal of the second frequency conversion means. And multipath searching means for searching for a path having a greater signal-to-noise ratio. Here, the multi-path searching means includes a time delay adjusting unit for adjusting a time delay with respect to a signal input from a second frequency converting means, a signal input from the second frequency converting means passing through the time delay adjusting unit, and the first signal. A correlator for measuring a correlation between signals input from the frequency converting means, an integrator accumulating the signals output from the correlator for a predetermined time, a comparator comparing the signals output from the integrator and a reference value, and the comparator A multipath interference noise determiner for outputting a reference value and sorting the multipaths according to time or according to an autocorrelation integral value, and a memory unit for storing the time delay value and the autophase integration value. It features.

Hereinafter, an interference noise canceling apparatus and method of a wireless repeater system according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

[Example]

FIG. 2 is a block diagram illustrating an interference noise canceling device of a wireless repeater system according to a first embodiment of the present invention, and FIG. 3 is a block diagram of an adaptive interference noise removing unit shown in FIG.

The first embodiment of the present invention is for explaining an interference noise canceller applied to a wireless repeater system of a broadcast signal transmitted in one direction. As shown in FIGS. 2 to 3, the first and second transmit / receive antennas ( 21a, 21b, first frequency converting means 23 for down-converting the frequency of the broadcast signal received through the first transmit / receive antenna 21a, and output signals of the first frequency converting means 23. Adaptive interference noise canceling means 27 for canceling the included interference noise using an adaptive compensation algorithm and the signal coupled at the end of the transmission means 25, and the adaptive interference noise canceling means 27 Up-converting the output signal to a frequency in operation, receiving a feedback means coupled to the transmission means 25 for adjusting the transmission level and a signal coupled at the end of the transmission means 25 and down-converts the frequency The adaptive interference And a second frequency converting means 29 for outputting to the noise removing means 27. For reference, the interference noise refers to a signal that acts as a noise to the original signal by re-input of the transmission signal output through the antenna back to the antenna.

In this case, the first frequency converting means 23 amplifies the signal received through the first transmit / receive antenna 21a and then performs frequency downconversion so that the adaptive interference noise removing means 27 can be used.

The transmitting means 25 up-converts the signal output from the adaptive interference noise removing means 27 to a frequency currently being operated, amplifies it to a predetermined width, and performs a second transmit / receive antenna 21b. The transmission level to be output is determined.

Coupling means 31 for outputting the output signal of the transmitting means 25 to the second transmit and receive antenna 21b at the end of the transmitting means 25 and the coupling signal to the second frequency converting means 29. The coupling means 33 further includes a duplexer or a coupler.

The second frequency converting means 29 receives the signal coupled from the coupling means 31 and feeds it back to the first frequency converting means 23 so that the adaptive interference noise removing means 27 can be used. The frequency downconversion is performed in the same manner as in the following to provide a reference signal for removing the interference noise from the adaptive interference noise removing unit 27.

The adaptive interference noise removing unit 27 performs modeling using the signal input from the second frequency conversion unit 29 which down-converts and outputs the signal coupled by the coupling unit 31 as a reference signal. The transmission signal re-input to the first transmission / reception antenna 21a is removed. At this time, the modeling is continued until the two signals match while continuously reducing the error between the re-input signal and the modeled value. For reference, the modeling means that the characteristics of the transmission signal re-input to the first transmission / reception antenna 21a are extracted. Such modeling is performed by using parameters such as time delay value, phase value, and gain value of the signal. Is performed.

The adaptive interference noise canceling unit 27 is largely comprised of an adaptive compensation algorithm unit 41, an adaptive interference cancellation filter unit 43, and an interference cancellation unit 45.

The adaptive compensation algorithm unit 41 receives the output signal of the interference canceling unit 45 and the output signal of the second frequency converting means 31 which receives the coupling signal from the coupling means 31 and down-converts the frequency. Extract the characteristic value of the interference noise (re-input transmission signal) by using.

The adaptive interference elimination filter 43 applies only the characteristic value extracted by the adaptive compensation algorithm unit 41 to output only interference noise to the interference elimination unit 45, and the interference elimination unit 45 is implemented by 1 The interference signal output from the adaptive interference cancellation filter unit 43 is removed from the output signal of the frequency conversion means 23 and output to the transmission means 25. In this case, the adaptive compensation algorithm unit 41 extracts the gain, phase, and time delay range for the interference noise and outputs it to the adaptive interference cancellation filter unit 43.

As shown in FIG. 4, the adaptive compensation algorithm unit 41 is re-input to the first frequency converting means 23 based on the signal a input to the second frequency converting means 29. A time delay range, a phase, and a gain value are extracted to have the same characteristics as the transmission signal a ', and the extracted value is output to the adaptive interference cancellation filter unit 43. Accordingly, the adaptive interference cancellation filter 43 adjusts the time delay, phase, and gain values input from the adaptive compensation algorithm 41 and outputs a 'to the interference cancellation unit 45. Accordingly, the interference canceling unit 45 subtracts the output signal a 'output from the adaptive interference canceling filter unit 43 from the signal a + a' input from the first frequency converting means 23. Only the signal a is output to the transmitting means 25.

According to the first embodiment of the present invention, frequency-converting the signal coupled at the end of the transmitting means 25 and using it as a reference signal for removing the interference noise in the adaptive interference noise removing means 27 Therefore, the interference noise (re-input signal of the transmitted signal) generated between the transmitting antenna and the receiving antenna can be removed using the adaptive compensation algorithm without being affected by the analog characteristics of the various analog elements constituting the transmitting means 25. It becomes the number.

In addition, the interference noise removing apparatus of the wireless repeater system according to the first exemplary embodiment of the present invention uses the output signal of the first frequency converting means 23 and the output signal of the second frequency converting means 29. The apparatus may further include multipath searching means for searching a path having a signal-to-noise ratio greater than a reference value among interference noises on the multipath included in the signal output from the first frequency converting means 23.

Typically, if the system gain is greater than the isolation between the antennas, some of the signals transmitted through the transmit antennas are re-entered via the multipath to the receive antennas of the wireless repeater.

Accordingly, as shown in FIG. 5, the multipath search unit 51 is additionally configured in the configuration as shown in FIG. 2 to further improve the performance of the adaptive compensation algorithm in removing the re-input transmission signal input through the multipath. I wanted to.

The multi-path searching means 51 performs the autocorrelation integration between the signal input from the first frequency converting means 23 and the signal input from the second frequency converting means 29 to set the autocorrelation integral value. Estimate the path if greater than the value. As such, when the multipath search unit 51 is further configured, the complexity of the adaptive compensation algorithm unit 41 and the adaptive interference cancellation filter unit 43 is significantly reduced, and the accurate time delay value is used. Performance can be further improved.

In other words, the complexity of the adaptive compensation algorithm unit 41 and the adaptive interference cancellation filter unit 43 is based on the transmission signals (retransmission signals re-entered in the multi-path) that are re-input to the first frequency converting means 23. It increases in proportion to the time delay, and means that the number of values (gain, phase, time delay, etc.) to be modeled by the adaptive compensation algorithm unit 41 increases. The more values that need to be modeled, the more complex the algorithm becomes, and the more likely it is that the number of errors will increase if the error is the same for each filter coefficient.

Therefore, since the transmission signals re-input to the first transmit / receive antenna 21a have many time delay components, it may not be possible to determine which one of the time delay components should be compensated. Therefore, the adaptive compensation algorithm unit 41 is required for modeling. The only option is to set the time delay range to the maximum. However, if the time delay range is set to the maximum, the adaptive compensation algorithm unit 41 becomes more complicated.

Therefore, in the embodiment of the present invention, by using the multipath searching means, it is possible to optimally determine the time delay range to be compensated among the signals re-input to the first frequency converting means 23, so that the adaptive compensation algorithm unit The complexity of (41) can be minimized by that much.

The multipath searching means will be described in more detail as follows.

FIG. 6 is a block diagram of the multipath searching unit shown in FIG. 5, which includes a time delay adjusting unit 61 for adjusting a time delay value for a signal input from the second frequency converting unit 29, and the time delay adjusting unit. A correlator 63 for measuring a correlation between the signal input from the second frequency converting means 29 passing through the signal 61 and the signal input from the first frequency converting means 23, and the correlator 63; An integrator 65 accumulating the signals output from the signal for a predetermined time, a comparator 67 comparing the signal output from the integrator 65 with a reference value, and outputting a reference value to the comparator 67, And a multipath interference noise determiner 69 for aligning the multipaths with time or an autocorrelation integral value, and a memory 71 for storing the time delay value and the autocorrelation integral value.

According to the multipath searching means configured as described above, the signal output from the second frequency converting means 29 is input to the time delay adjusting unit 61 and set to the time delay value set by the multipath interference noise determining unit 69. The correlator 63 is output.

Correlator 63 measures the correlation between the signal input from the time delay adjustment unit 61 and the signal input from the first frequency conversion means 23. The integrator 65 located at the output of the correlator 63 accumulates for a predetermined time in order to increase the reliability of the signal output from the correlator 63 and then outputs it to the comparator 67. The comparator 67 compares the reference value input from the multipath interference noise determiner 69 with the autocorrelation integral value input from the integrator 65. At this time, the method of setting the reference value is set the ratio of the signal re-input to the first frequency conversion means 23 and the signal input to the first frequency conversion means 23, and then the first frequency After measuring by the autocorrelation integral value between the signal input from the conversion means 23 and the signal input from the second frequency conversion means 29, it is set to a reference value, the reference value is a value required by the communication service provider It is desirable to be set to.

On the other hand, as a result of comparing the autocorrelation integral value and the reference value in the comparator 67, when the autocorrelation integral value is larger than the reference value, the autocorrelation integral value is input to the multipath interference noise determiner 69. The autocorrelation integral value smaller than the reference value is determined by the multipath interference noise determining unit 69 by adjusting the time delay value, thereby outputting the output signal of the first frequency conversion means 23 and the output of the second frequency conversion means 29. Redo the autocorrelation with the signal. In this case, the multipath interference noise determiner 69 stores the autocorrelation integral value larger than the reference value in the memory 71. This series of processes is performed to align the autocorrelation integral values by time delay values and output the time delay values to the adaptive interference noise removal means 27.

Thus, the adaptive interference noise removing means 27 removes interference noise through a series of processes described above, and the adaptive interference noise removing means 27 has already been described above, and will not be described below. .

Hereinafter, a method of removing interference noise of a wireless repeater system according to a first embodiment of the present invention will be described with reference to the flowchart shown in FIG. 7.

First, after down-converting the frequency of the signal input to the first transmit / receive antenna 21a by the first frequency converting means 23 (S701), the interference canceling unit 45 constituting the adaptive interference noise removing means 27 is obtained. ) At this time, the interference cancellation unit 45 subtracts the initial output value of the adaptive interference cancellation filter unit 43 from the input signal (original signal + re-input transmission signal) and outputs the result to the transmission means 25 (S702). ).

The transmitting means 25 performs up-conversion of the input signal to the currently operating frequency, adjusts the transmission level (S703), and then transmits it through the coupling means 31 and the second transmission / reception antenna 21b in sequence. The signal coupled by the coupling means 31 is output to the second frequency converting means 29.

The second frequency converting means 29 performs frequency down-conversion of the coupling signal as in the first frequency converting means 23 (S704), and then outputs it to the adaptive compensation algorithm unit 41 ( S705).

The adaptive compensation algorithm unit 41 uses the signal input from the second frequency converting means 29 as a reference signal and uses the signal output from the interference canceling unit 45 to perform a first transmission / reception antenna 21a. In step S706, the characteristic value of the transmission signal a 're-input is extracted. That is, the adaptive compensation algorithm unit 41 extracts the gain, phase, and time delay value of the re-input transmission signal based on the signal input from the second frequency converting means 29. The extracted gain, phase, and time delay values of the re-input transmission signals are output to the adaptive interference cancellation filter 43 (S707).

Accordingly, the adaptive interference cancellation filter 43 applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41 to the filter, and applies the re-input transmission signal a 'to the interference cancellation unit. Output to 45 (S708).

The interference canceling unit 45 is a signal obtained by subtracting the signal a 'input from the adaptive interference cancellation filter unit 43 from the signal a + a' input from the first frequency converting means 23 ( a) is output to the transmission means 25 (S709), and finally outputted through the second transmit / receive antenna 21b.

8A to 8B are flowcharts illustrating a method of removing a re-inputted transmission signal using multipath searching means, and a process of searching for multipaths by the multipath searching means is further compared with FIG. 7 described above. Include.

That is, as shown in FIGS. 8A to 8B, after the frequency down-conversion of the signal input to the first transmit / receive antenna 21a by the first frequency converting means 23 (S801), the adaptive interference noise removing means 27 ) Is outputted to the adaptive compensation algorithm unit 41 and the interference canceling unit 45, which constitutes < RTI ID = 0.0 > At this time, the interference cancellation unit 45 subtracts the initial output value of the adaptive interference cancellation filter unit 43 from the input signal (original signal + re-input transmission signal) and outputs the result to the transmission means 25 (S802). ).

The transmitting means 25 performs up-conversion of the input signal to the currently operating frequency, adjusts the transmission level (S803), and then transmits it through the coupling means 31 and the second transmission / reception antenna 21b in sequence. The signal coupled by the coupling means 31 is output to the second frequency converting means 29.

The second frequency converting means 29 performs frequency down-conversion of the coupling signal as in the first frequency converting means 23 (S804), and then multi-path searching means 51 and the adaptive compensation algorithm. Output to the unit 41 (S805).

Accordingly, the time delay adjusting unit 61 of the multipath searching unit 51 uses the time delay value of the signal input from the second frequency converting unit 29 as a reference value input from the multipath interference noise determining unit 69. After adjustment (S806), it is output to the correlator 63.

Accordingly, the correlator 63 measures the correlation between the signal input from the time delay adjusting unit 61 and the signal input from the first frequency converting means 23 (S807), and is located at the output of the correlator 63. The integrator 65 accumulates for a predetermined time in order to increase the reliability of the signal output from the correlator 63 (S808), and outputs it to the comparator 67.

The accumulated autocorrelation value input to the comparator 67 is compared with a reference value input from the multipath interference noise determiner 69 (S809). In this case, as a result of comparing the autocorrelation integral value with the reference value in the comparator 67, when the autocorrelation integral value is larger than the reference value, the autocorrelation integral value is input to the multipath interference noise determiner 69. (S810), the autocorrelation integral value smaller than the reference value is determined by the multipath interference noise determiner 69 by adjusting the time delay value, thereby outputting the output signal of the first frequency conversion means 23 and the second frequency conversion means ( Repeat the autocorrelation integration with the output signal in (29).

Subsequently, the autocorrelation integral value (greater than a reference value) input to the multipath interference noise determiner 69 is stored in the memory unit 71, and then the autocorrelation integral values are sorted according to the time delay values, and the time delay value. Is output to the adaptive interference removing means 27 (S811).

The adaptive compensation algorithm unit 41 of the adaptive interference noise removing unit 27 is based on the time delay value input from the multipath searching unit 51 and the signal input from the second frequency converting unit 29. As a signal, the characteristic value of the transmission signal a 're-input to the first transmission / reception antenna 21a is extracted (S812). That is, the adaptive compensation algorithm unit 41 gains, phases, and time delay values of the transmission signal re-input to the first transmission / reception antenna 21a based on the signal input from the second frequency conversion unit 29. Extract At this time, the time delay value is applied to the value input from the multipath search means (51).

The gain, phase, and time delay values of the extracted re-input transmission signals are output to the adaptive interference cancellation filter 43 (S813).

Accordingly, the adaptive interference cancellation filter 43 applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41 to the filter, and removes only the re-input transmission signal a 'from the interference cancellation unit. Output to 45 (S814).

The interference canceling unit 45 is a signal obtained by subtracting the signal a 'input from the adaptive interference cancellation filter unit 43 from the signal a + a' input from the first frequency converting means 23 ( a) is outputted to the transmission means 25 (S815), and finally outputted through the second transmit / receive antenna 21b.

As described above, the apparatus and method for eliminating interference noise of a wireless repeater system according to the first embodiment of the present invention solves a problem in which a transmitted broadcast signal of a wireless repeater is re-input to an antenna using an adaptive compensation algorithm in real time. do.

In addition, by configuring a multi-path search means in the adaptive compensation algorithm to measure the signal-to-noise ratio for the noise signal on the multi-path re-input to the antenna for each path, the adaptive compensation algorithm for the path that is greater than the reference value By eliminating using, the complexity of the adaptive compensation algorithm unit and the adaptive interference cancellation filter unit is reduced to improve the performance of the adaptive compensation algorithm.

Hereinafter, an interference noise canceling apparatus and method of a wireless repeater system according to a second embodiment of the present invention will be described.

FIG. 9 is a block diagram illustrating an interference noise canceling device of a wireless repeater system according to a second embodiment of the present invention. FIG. 10A is a block diagram illustrating a forward adaptive interference noise removing unit, and FIG. 10B is a backward adaptive interference noise. A block diagram of the removal means.

As described above, the second embodiment of the present invention is applied to a mobile communication system in which signals are transmitted in both directions. Unlike the above-described first embodiment, the second embodiment includes a forward link configuration and a reverse link configuration. The configuration of the links is the same.

This will be described in more detail as follows.

First, as shown in FIG. 9, the interference noise canceling apparatus of the wireless repeater system according to the second exemplary embodiment of the present invention greatly reduces the interference noise included in the signal input through the first transmission / reception antenna 21a. Forward interference cancellation device (100a) to remove the signal coupled at the front end of the transmission and reception antenna 21b by using an adaptive compensation algorithm and the interference contained in the signal input through the second transmission and reception antenna (21b) And a reverse interference noise canceller 100b that removes noise through a coupled signal and an adaptive compensation algorithm at the front end of the first transmit / receive antenna 21a.

Here, the forward interference noise removing apparatus 100a includes a first coupling means 31a connected to a first transmission / reception antenna 21a and a first frequency conversion means 23a connected to the first coupling means 31a. A forward adaptive interference noise removing means 27a connected to an output terminal of the first frequency conversion means 23a, a forward transmitting means 25a connected to an output terminal of the forward adaptive interference noise removing means 27a, After receiving the second coupling means 31b connected to the output terminal of the forward transmission means 25a and the signal coupled by the second coupling means 31b as a feedback signal, and performing frequency down conversion on the feedback signal, And a second frequency converting means 29a for outputting the reference signal of the forward adaptive interference noise removing means 27a.

Comparing the forward interference noise canceller 100a with the first embodiment described above, it can be seen that the first coupling means 31a has the same configuration except that the first coupling means 31a is additionally configured.

On the other hand, the reverse interference noise removing apparatus 100b is a first frequency conversion means 23b connected to the second coupling means 31b and a reverse adaptive type connected to an output terminal of the first frequency conversion means 23b. Interference noise canceling means 27b, reverse transmission means 25b connected to an output end of the backward adaptive interference noise canceling means 27b, and first coupling means 31a connected to an output end of the backward transmission means 25b. ) And a second frequency converting means for receiving the signal coupled by the first coupling means 31a as a feedback signal and performing frequency downconversion to output as a reference signal of the backward adaptive interference noise removing means 27b. It comprises a 29b.

It can be seen that the reverse interference noise canceller 100b is configured in the same way as the forward interference noise canceller 100a, and the first coupling means 31a and the second coupling means 31b are forward interference noise. It can be seen that it is commonly used with the removal device 100a.

Here, the first coupling means 31a prevents the signal input to the forward link from flowing into the output in the reverse direction, and simultaneously prevents the reverse output from flowing into the forward input. In addition, the signal coupled at the end of the reverse transmission means 25b is fed back to the second frequency conversion means 29b of the reverse interference noise canceller 100b.

The second coupling means 31b prevents the forward output from flowing into the reverse input and at the same time prevents the reverse input from flowing into the forward output, and forward-couples the signal coupled at the end of the forward transmission means 25a. Feedback to the second frequency converting means 29a of the noise canceling apparatus 100a.

The first frequency converting means 23a of the forward interference noise removing apparatus 100a suppresses an increase in noise added to the signal input from the first coupling means 31a, and then amplifies the signal and amplifies the amplified signal. Frequency downconversion is performed so that the signal can be used in the forward adaptive interference noise canceling means 27a.

The first frequency converting means 23b of the reverse interference noise canceller 100b suppresses an increase in noise added to the signal input from the second coupling means 31b, and then amplifies the signal and amplifies the amplified signal. The frequency downconversion is performed so that can be used in the backward adaptive interference noise canceling means 27b.

The forward transmission means 25a up-converts the signal output from the forward adaptive interference noise removing means 27a to a frequency currently in operation, and amplifies the signal to pass through the second coupling means 31b. It transmits to the base station and the terminal through the second transmit and receive antenna 21b.

The reverse transmission means 25b up-converts the signal output from the backward adaptive interference noise removing means 27b to a frequency currently in operation, and amplifies the signal to pass through the first coupling means 31a. It transmits to the base station and the terminal through the first transmitting and receiving antenna 21a.

The second frequency conversion means 29a of the forward interference noise canceling apparatus 100a receives a feedback signal coupled from the second coupling means 31b and feeds the feedback signal from the forward adaptive interference noise removing means 27a. Frequency downconversion is performed so that it can be used and output to the forward adaptive interference noise removing means 27a.

The second frequency converting means 29b of the reverse interference noise canceling apparatus 100b receives a feedback signal coupled from the first coupling means 31a and receives the feedback signal from the reverse adaptive interference noise removing means 27b. A frequency downconversion is performed so that it can be used, and outputted to the backward adaptive interference noise removing means 27b.

The forward adaptive interference noise canceling means 27a uses the first frequency converting means 23a (forward interference noise) using a signal down-converted from the signal coupled by the second coupling means 31b as a reference signal. The re-inputted transmission signal is removed by modeling the transmission signal re-input to the first transmission / reception antenna 21a using an adaptive compensation algorithm among the signals input from the removal device. At this time, the error between the transmission signal re-input to the first frequency converting means 23a and the modeled value is continuously reduced, and the modeling is repeated repeatedly until the two signals coincide.

The backward adaptive interference noise canceling means 27b uses the first frequency converting means 23b (reverse interference noise) using a signal down-converted from the signal coupled by the first coupling means 31a as a reference signal. The re-inputted transmission signal is removed by modeling the transmission signal re-input to the second transmission / reception antenna 21b using an adaptive compensation algorithm among the signals input from the removal device. At this time, the error between the transmission signal re-input to the first frequency converting means 23b and the modeled value is continuously reduced, so that modeling is repeatedly performed until the two signals coincide.

On the other hand, the configuration of the forward adaptive interference noise removing means 27a is, as shown in Figure 10a, the adaptive compensation algorithm unit 41a, the adaptive interference cancellation filter unit 43a, and the interference cancellation unit 45a It is configured to include).

In this case, as shown in FIG. 10A, the adaptive compensation algorithm unit 41a uses the signal input from the second frequency converting means 29a as a reference signal and simultaneously receives the signal output from the interference canceling unit 45a. The characteristic value of the transmission signal a 're-input to the first transmission / reception antenna 21a is extracted. That is, the adaptive compensation algorithm unit 41a extracts the gain, phase, and time delay value of the re-input transmission signal based on the signal input from the second frequency converting means 29a. The extracted gain, phase, and time delay values of the re-input transmission signals are output to the adaptive interference cancellation filter unit 43a.

The adaptive interference cancellation filter 43a applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41a to the filter and applies the re-input transmission signal a 'to the interference cancellation unit 45a. And the interference canceling unit 45a is a signal a 'input from the adaptive interference elimination filter unit 43a from the signal a + a' input from the first frequency converting means 23a. The signal (a) obtained by subtracting) is output to the forward transmission means 25a.

As shown in FIG. 10B, the backward adaptive interference noise canceling means 27b is also applied to the adaptive compensation algorithm unit 41b and the adaptive interference canceling filter unit, similarly to the forward adaptive interference noise removing means 27a. 43b and the interference canceling unit 45b, wherein the adaptive compensation algorithm unit 41b of the adaptive interference noise canceling unit 27b interferes with the signal input from the second frequency converting unit 29b. The gain, phase, and time delay values of the transmission signal re-input to the second transmission / reception antenna 21b are extracted using the signal output from the removal unit 45b, and then output to the adaptive interference cancellation filter unit 43b. .

The adaptive interference cancellation filter 43b applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41b to the filter, and outputs the re-input transmission signal to the interference cancellation unit 45b. Accordingly, the interference canceling unit 45b outputs only the signal obtained by subtracting the signal input from the adaptive interference cancellation filter unit 43b to the reverse transmission unit 25b from the signal input from the first frequency conversion unit 23b. .

The interference noise canceling apparatus of the wireless repeater system according to the second embodiment of the present invention configured as described above has a frequency coupled to the signal coupled from the second coupling means 31b positioned at the end of the forward transmission means 25a during the forward link. Re-transmitting the adaptive interference noise removing means 27a included in the signal input from the first frequency converting means 23a by using the down-converted value as a reference signal of the forward adaptive interference removing means 27a. Removes the signal and outputs it to the forward transmission means 25a. In reverse linking, the value obtained by frequency downconverting the signal coupled by the first coupling means 31a located at the end of the reverse transmission means 25b is reversely adapted. The reverse adaptive interference noise removing means 27b removes the re-input transmission signal included in the signal input from the first frequency converting means 23b by using the reference signal of the type interference noise removing means 27b. Output to reverse transmission means 25b.

Therefore, in the forward link, the frequency of the signal coupled at the end of the forward transmission means 25a is down-converted so that the interference interference (transmission signal re-input to the first transmit / receive antenna) is applied by the adaptive interference noise removing means 27a. Since it is used as a reference signal for removing, interference generated between the first transmit / receive antenna 21a and the second transmit / receive antenna 21b without being affected by the analog characteristics of the various analog elements constituting the forward transmission means 25a. The noise can be completely removed.

Similarly, in the reverse link, the coupled signal is down-converted at the end of the reverse transmission means 25b to remove the interference noise (the transmission signal re-input to the second transmit / receive antenna) by the adaptive interference noise removing means 27b. Since it is used as a reference signal for interfering with each other, the interference noise generated between the first transmit / receive antenna 21a and the second transmit / receive antenna 21b without being affected by the analog characteristics of the various analog elements constituting the reverse transmission means 25b. It can be removed completely.

In addition, the interference noise canceling device of the wireless repeater system according to the second embodiment of the present invention includes the output signal of the first frequency converting means 23a and the second frequency converting means to the forward interference noise removing device 100a. Forward multipath searching means 51a for searching a path having a signal-to-noise ratio greater than a reference value among the interference noises on the multipath included in the signal output from the first frequency converting means 23a using the output signal of 29a). Further, the reverse interference noise canceling apparatus 100b may further comprise reverse multipath searching means 51b having the same function.

FIG. 11 is a block diagram illustrating an interference noise canceling device of a wireless repeater system according to a second embodiment of the present invention. FIG. 9 illustrates an example in which a forward multipath searching unit and a reverse multipath searching unit are additionally configured.

As such, when the forward multipath search unit 51a and the reverse multipath search unit 51b are further configured, the re-input transmission signal input to the first transmit / receive antenna 21a through the multipath during the forward link is removed. Reduces the complexity of the adaptive compensation algorithm unit 41a and the adaptive interference cancellation filter unit 43a constituting the forward adaptive interference noise canceling means 27a in the case of the second link. In eliminating the re-input transmission signal input to the reverse adaptive interference noise canceling means 27b, the complexity of the adaptive compensation algorithm section 41b and the adaptive interference cancellation filter section 43b can be reduced.

Such forward and backward multipath searching means has substantially the same configuration as the multipath searching means of the first embodiment described above, and the configuration and operation of the forward multipath searching means and the reverse multipath searching means are the same.

That is, as illustrated in FIG. 12A, the forward multipath searching unit 51a includes a time delay adjusting unit 61a for adjusting a time delay with respect to a signal input from the second frequency converting unit 29a, and the time delay adjusting unit. A correlator 63a for measuring the degree of correlation between the signal input from the second frequency converting means 29a passing through 61a and the signal input from the first frequency converting means 23a, and the correlator 63a. Integrator (65a) for accumulating the signal output from the for a predetermined time, a comparator (67a) for comparing the signal output from the integrator (65a) and the reference value, and outputs a reference value to the comparator (67a), multi-path And a multipath interference noise determiner 69a for sorting the signals according to time or according to an autocorrelation integral value and a memory unit 71a for storing the time delay value and the integral value between the autophases.

According to the forward multipath searching unit 51a configured as described above, the signal output from the second frequency converting unit 29a is input to the time delay adjusting unit 61a to set the time delay set by the multipath interference noise determining unit 69a. After setting to, it is output to the correlator 63a.

Correlator 63a measures the degree of correlation between the signal input from time delay adjusting section 61a and the signal input from first frequency converting means 23a. The integrator 65a located at the output of the correlator 63a accumulates for a predetermined time in order to increase the reliability of the signal output from the correlator 63a, and then outputs it to the comparator 67a. The comparator 67a compares the reference value input from the multipath interference noise determiner 69a with the autocorrelation integral value input from the integrator 65a. At this time, the method of setting the reference value is a ratio of the transmission signal re-input to the first frequency conversion means 23a and the signal input to the first frequency conversion means 23a, and then the first frequency conversion. After measuring by the autocorrelation integral value between the signal input from the means 23a and the signal input from the second frequency converting means 29a, the reference value is set to a reference value, and the reference value is a value required by the service provider. It is desirable to be able to set.

On the other hand, as a result of comparing the autocorrelation integral value and the reference value in the comparator 67a, when the autocorrelation integral value is larger than the reference value, the autocorrelation integral value is input to the multipath interference noise determiner 69a. The autocorrelation integral value smaller than the reference value is set by the multipath interference noise determiner 69a to adjust the time delay value, thereby outputting the output signal of the first frequency conversion means 23a and the output of the second frequency conversion means 29a. Redo the autocorrelation with the signal. In this case, the multipath interference noise determiner 69a stores the autocorrelation integral value larger than the reference value in the memory unit 71a. This series of processes is performed to align the autocorrelation integrals for each time delay value and output the time delay value to the adaptive interference cancellation filter portion 43a of the forward adaptive interference noise removal means 27a.

As shown in FIG. 12B, the reverse multipath searching means 51b outputs the time delay value to the backward adaptive interference noise canceling means 27b, and its configuration and operation are the aforementioned forward multipath searching means 51a. ), So a detailed description thereof will be omitted below.

Hereinafter, a method of removing interference noise of a wireless repeater system according to a second embodiment of the present invention will be described with reference to FIGS. 13 and 14A to 14B.

FIG. 13 is a flowchart for explaining a method of removing interference noise in a forward link, and after down-converting a frequency of a signal input to the first transmit / receive antenna 21a by the first frequency converting means 23a (S1301), the forward adaptation is performed. It outputs to the adaptive compensation algorithm part 41a and the interference removal part 45a which comprise the type interference noise canceling means 27a. At this time, the interference canceling unit 45a subtracts the initial output value of the adaptive interference canceling filter unit 43a from the input signal (original signal + re-inputted transmission signal) and outputs it to the forward transmission means 25a ( S1302).

The forward transmission means 25a performs an up-conversion of the input signal to a frequency currently in operation, adjusts a transmission level (S1303), and then connects the second coupling means 31b and the second transmission / reception antenna 21b. Transmitted in turn, and the signal coupled by the second coupling means 31b is output to the second frequency conversion means 29a.

The second frequency converting means 29a performs frequency downconversion of the coupling signal as in the first frequency converting means 23a (S1304), and then adapts the forward adaptive interference noise removing means 27a. It outputs to the type compensation algorithm part 41a (S1305).

The adaptive compensation algorithm unit 41a uses the signal input from the second frequency conversion unit 29a and the signal output from the interference canceling unit 45a to retransmit the transmission signal (re-input to the first transmission / reception antenna 21a). a ') feature value is extracted (S1306). The extracted gain, phase, and time delay values of the re-input transmission signals are output to the adaptive interference cancellation filter unit 43a (S1307).

Accordingly, the adaptive interference cancellation filter 43a applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41a to the filter, and applies the re-input transmission signal a 'to the interference cancellation unit. Output to 45a (S1308).

The interference canceling unit 45a is a signal obtained by subtracting the signal a 'input from the adaptive interference elimination filter unit 43a from the signal a + a' input from the first frequency conversion unit 23a. a) is outputted to the forward transmission means 25a (S1309), and finally outputted through the second transmit / receive antenna 21b.

Meanwhile, FIGS. 14A to 14B are flowcharts for explaining a method of removing a transmission signal re-input by multipath by further configuring a multipath search unit in a forward interference noise canceller. The method may further include a process of searching for a multipath by the path search means.

That is, as shown in FIGS. 14A to 14B, after frequency down-converting the signal input to the first transmit / receive antenna 21a by the first frequency converting means 23a (S1401), a forward adaptive interference noise removing means ( Output to the adaptive compensation algorithm unit 41a and the interference canceling unit 45a constituting 27a). At this time, the interference canceling unit 45a subtracts the initial output value of the adaptive interference canceling filter unit 43a from the input signal (original signal + re-inputted transmission signal) and outputs it to the forward transmission means 25a ( S1402).

The forward transmission means 25a performs an up-conversion of the input signal to a frequency currently in operation, adjusts a transmission level (S1403), and then performs a second coupling means 31b and a second transmission / reception antenna 21b. Transmitted in turn, and the signal coupled by the second coupling means 31b is output to the second frequency conversion means 29a.

The second frequency converting means 29a performs a frequency downconversion of the coupling signal as in the first frequency converting means 23a (S1404), and then multi-path searching means 51a and an adaptive compensation algorithm. It outputs to the part 41a (S1405).

Accordingly, the time delay adjusting unit 61a of the multipath searching unit 51a uses the time delay value of the signal input from the second frequency converting unit 29a as a reference value input from the multipath interference noise determining unit 69a. After adjustment (S1406), it is output to the correlator 63a.

Accordingly, the correlator 63a measures the degree of correlation between the signal input from the time delay adjusting unit 61a and the signal input from the first frequency converting means 23a (S1407), and is located at the output of the correlator 63a. The integrator 65a accumulates for a predetermined time in order to increase the reliability of the signal output from the correlator 63a (S1408), and outputs it to the comparator 67a.

The accumulated autocorrelation value input to the comparator 67a is compared with a reference value input from the multipath interference noise determiner 69a (S1409). In this case, as a result of comparing the autocorrelation integral value and the reference value in the comparator 67a, when the autocorrelation integral value is larger than the reference value, the autocorrelation integral value is input to the multipath interference noise determiner 69a. In operation S1410, the autocorrelation integral value smaller than the reference value is adjusted by the multipath interference noise determiner 69a to adjust the time delay value, thereby outputting the output signal of the first frequency conversion means 23a and the second frequency conversion means 29a. Re-integrate the autocorrelation with the output signal.

Thereafter, an autocorrelation integral value (greater than a reference value) input to the multipath interference noise determiner 69a is stored in the memory unit 71a. The autocorrelation integrals are sorted by the time delay values, and the time delay values are output to the adaptive interference noise removing means 27a (S1411).

The adaptive compensation algorithm unit 41a of the forward adaptive interference noise canceling unit 27a performs a time delay value input from the multipath searching unit 51a and a signal input from the second frequency converting unit 29a. As a reference signal, a characteristic value of the transmission signal a 're-input to the first transmission / reception antenna 21a is extracted (S1412). That is, the adaptive compensation algorithm unit 41a uses the signal input from the second frequency conversion unit 29a and the signal output from the interference canceling unit 45a to obtain the gain, phase, and time delay of the re-input transmission signal. Extract the value. At this time, the time delay value is applied to the value input from the multi-path search means (51a).

The gain, phase, and time delay values of the re-input transmission signals extracted as described above are output to the adaptive interference cancellation filter unit 43a (S1413).

Accordingly, the adaptive interference cancellation filter 43a applies the gain, phase, and time delay values input from the adaptive compensation algorithm 41a to the filter, and applies the re-input transmission signal a 'to the interference cancellation unit. Output to 45a (S1414).

The interference canceling unit 45a is a signal obtained by subtracting the signal a 'input from the adaptive interference elimination filter unit 43a from the signal a + a' input from the first frequency conversion unit 23a. a) is output to the transmitting means 25a (S1415), and finally outputted through the second transmit / receive antenna 21b.

In the above description, a method of canceling a transmission signal re-input through the first transmit / receive antenna 21a in the forward link and a forward adaptive compensation algorithm unit 41a and an adaptive interference cancellation filter unit using the multipath search unit 51a are provided. Although the method of reducing the complexity of (43a) has been described to more easily remove the multi-path transmission signal, the re-input transmission signal is removed in the same way as the forward link even in the reverse link. A description of how to remove the time re-input transmission signal is omitted below.

Although preferred embodiments of the present invention have been described above, it is clear that the present invention can use various changes, modifications, and equivalents, and that the above embodiments can be appropriately modified and applied in the same manner. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the interference noise canceling apparatus and the removing method of the wireless repeater system according to the embodiment of the present invention have the following effects.

Since the signal coupled at the end of the transmitter is used as a reference signal, an adaptive compensation algorithm can be applied in real time to eliminate interference noise acting as a noise on the original signal due to the re-input of the transmitted signal. Noise can be removed in real time to increase system stability and efficiency.

In addition, multipath search means can be additionally configured in the interference noise canceller using the adaptive compensation algorithm to estimate the time delay values for the interference noises in the multipath in advance, thereby reducing the complexity of the adaptive compensation algorithm. In addition, it is possible to reduce the complexity of the adaptive interference cancellation filter unit, thereby improving the performance of the adaptive compensation algorithm.

In addition, since the signal transmitted through the transmitting antenna of the wireless repeater is prevented from being re-entered through the receiving antenna, the gain of the wireless repeater system can be greatly increased.

In addition, since the signal separation between the transmitting and receiving antennas of the wireless repeater can be reduced, it is possible to reduce the facility investment cost and operating cost required for installing the antenna.

Claims (22)

An interference noise canceling apparatus of a wireless repeater system for relaying a broadcast signal transmitted in one direction between a first transmit and receive antenna and a second transmit and receive antenna, First frequency converting means for downconverting the frequency of the signal received by the first transmit / receive antenna; Adaptive interference noise removing means for removing interference noise included in the output signal of the first frequency converting means by using an adaptive compensation algorithm; Transmitting means for up-converting the output signal of the adaptive interference noise removing means to an operating frequency and adjusting a transmission level; And a second frequency converting means for receiving the coupled signal at the end of the transmitting means and converting the frequency down to provide a reference signal of the adaptive interference noise removing means. Noise Canceller. The apparatus of claim 1, further comprising a coupling means for coupling an output signal of the transmitting means at an end of the transmitting means and outputting the output signal to the second frequency converting means. . The method of claim 2, wherein the adaptive interference noise removing means, An adaptive compensation algorithm unit for extracting a characteristic value of interference noise included in an output signal of the first frequency converting means by using the signal input from the second frequency converting means as a reference signal; An adaptive interference cancellation filter unit for outputting only the interference noise by applying the characteristic value extracted by the adaptive compensation algorithm unit; And an interference canceling unit for removing the interference noise output from the adaptive interference canceling filter unit from the output signal of the first frequency converting unit and outputting the interference noise to the transmitting unit. . The signal of claim 1, wherein a signal larger than a reference value is included among the interference noises on the multipath included in the output signal of the first frequency converter by using the output signal of the first frequency converter and the output signal of the second frequency converter. The apparatus of claim 1, further comprising multipath searching means for searching for a path having a high noise ratio. An interference noise canceling apparatus of a wireless repeater system configured to remove forward and backward interference noises between a first transmit / receive antenna and a second transmit / receive antenna, A forward interference noise canceller which removes interference noise included in a signal received by the first transmit / receive antenna using a signal coupled at a front end of the second transmit / receive antenna and a forward adaptive compensation algorithm; And a reverse interference noise canceller which removes interference noise included in a signal received by the second transmit / receive antenna through a signal coupled in front of the first transmit / receive antenna and a backward adaptive compensation algorithm. Interference noise canceller in wireless repeater system. The apparatus of claim 5, wherein the forward interference noise canceller is provided. First coupling means for isolating a signal received through the first transmit / receive antenna from a transmission signal and providing a coupling signal used as a reference signal for removing interference noise in the reverse interference noise canceller; First frequency converting means for downconverting the frequency of the signal output from the first coupling means; A forward adaptive interference noise canceling means for removing interference noise included in the output signal of the first frequency converting means by using a signal coupled at the front end of the second transmit / receive antenna and an adaptive compensation algorithm; Forward transmission means for up-converting the output signal of the forward adaptive interference noise removing means to an operating frequency and adjusting a transmission level; Second frequency converting means for receiving the signal coupled at the end of the forward transmitting means and converting the frequency down-converted to provide a reference signal of the forward adaptive interference noise removing means; And a second coupling means connected to an end of the forward transmission means to output a coupling signal to the second frequency conversion means and to isolate the signal received through the second transmit / receive antenna from the transmission signal. Interference noise canceller in wireless repeater system. The method of claim 6, wherein the reverse interference noise canceller, First frequency converting means for down-converting the frequency of the signal output from the second coupling means; Reverse adaptive interference noise removing means for removing interference noise included in the output signal of the first frequency converting means by using a signal coupled by the first coupling means and an adaptive compensation algorithm; Reverse transmission means for up-converting the output signal of the backward adaptive interference noise removing means to an operating frequency and adjusting a transmission level; And a second frequency converting means for receiving the coupled signal at the end of the reverse transmitting means and down converting the frequency to provide a reference signal of the reverse adaptive interference noise removing means. Interference noise canceller. The apparatus of claim 5, wherein the forward and reverse interference noise cancellers are An adaptive compensation algorithm unit for extracting a characteristic value of interference noise included in an output signal of the first frequency converting means by using the signal input from the second frequency converting means as a reference signal; An adaptive interference cancellation filter unit for outputting only the interference noise by applying the characteristic value extracted by the adaptive compensation algorithm unit; And an interference cancellation unit for removing interference noise output from the adaptive interference cancellation filter unit from the output signal of the first frequency conversion unit. The method of claim 3 or 8, wherein the adaptive compensation algorithm unit, Modeling the output signal of the second frequency converting means for down-converting the coupling signal and the output signal of the interference canceling unit until the value modeled matches the output signal of the interference canceling unit. A interference noise canceling device of a wireless repeater system, characterized in that for extracting the characteristic value of the transmission signal re-input to the transmitting and receiving antenna. According to claim 8, The forward and reverse interference noise removing device, Multiple paths having a signal-to-noise ratio greater than a reference value among the interference noises on the multi-path included in the first frequency converting means using the output signal of the first frequency converting means and the output signal of the second frequency converting means Apparatus for eliminating interference of a wireless repeater system, characterized in that it further comprises a path search means. The method of claim 4 or 10, wherein the multipath search means, A time delay adjusting unit for adjusting a time delay with respect to the signal input from the second frequency converting means; A correlator for measuring a correlation between the signal input from the second frequency converting means and the signal input from the first frequency converting means passing through the time delay adjusting unit; An integrator that accumulates the signal output from the correlator for a predetermined time; A comparator for comparing a signal output from the integrator with a reference value; A multipath interference noise determiner for outputting a reference value to the comparator and aligning the multipaths according to time or according to an autocorrelation integral value; And a memory unit for storing an integral value between the time delay value and the magnetic phase. A method of removing interference noise in a wireless repeater system for relaying a broadcast signal transmitted in one direction between a first transmit / receive antenna and a second transmit / receive antenna, A re-input transmission signal included in the signal input to the first transmission / reception antenna is removed using an adaptive compensation algorithm by using a frequency down-converted signal of the signal coupled at the front end of the second transmission / reception antenna as a reference signal. Method for removing interference noise of a wireless repeater system, characterized in that. The method of claim 12, wherein the retransmission signal on the multi-path inputted to the first transmit / receive antenna is searched and a time delay value of the re-input transmission signal on a path having a signal-to-noise ratio greater than a reference value among the re-input transmission signals Extracting and applying the same to the adaptive compensation algorithm. A method of removing interference noise in a wireless repeater system for relaying a broadcast signal transmitted in one direction between a first transmit / receive antenna and a second transmit / receive antenna, Frequency downconverting the signal received by the first transmit / receive antenna; Extracting a characteristic value of a re-input transmission signal included in a reception signal of the frequency down-converted first transmission / reception antenna using a signal down-converted from the signal coupled in front of the second transmission / reception antenna as a reference signal; Wow; And removing the re-input transmission signal from the received signal of the first transceiving antenna by applying the extracted characteristic value. The method of claim 14, Determining a time delay value of the frequency down-converted coupling signal; Measuring a correlation between the signal whose time delay value is adjusted and a received signal of the first downlink antenna of which frequency is down-converted, and accumulating for a predetermined time; Comparing the accumulated autocorrelation integral value with a reference value and adjusting the time delay value until the autocorrelation integration value is smaller than the reference value until the reference value is larger than the reference value; And arranging the autocorrelation integral values larger than the reference value by time delay values, and then applying the time delay values to an adaptive compensation algorithm. A method for removing interference noise in a wireless repeater system for relaying signals in a forward and reverse direction between a first transmit / receive antenna and a second transmit / receive antenna, In the forward link, a forward adaptive compensation algorithm is applied to a re-input transmission signal included in a signal received by the first transmit / receive antenna using a signal down-converted from a signal coupled in front of the second transmit / receive antenna as a reference signal. In the reverse link, the re-input transmission signal included in the signal received by the second transmission / reception antenna is reversed by using the signal down-converted as a reference signal when the signal coupled from the front end of the first transmission / reception antenna is used as a reference signal. A method for canceling interference noise in a wireless repeater system, characterized by using an adaptive compensation algorithm. The method of claim 16, wherein in the forward link, Frequency downconverting the signal received by the first transmit / receive antenna; Extracting a characteristic value of a re-input transmission signal included in a reception signal of the frequency down-converted first transmission / reception antenna using a signal down-converted from the signal coupled in front of the second transmission / reception antenna as a reference signal; Wow, And removing the re-input transmission signal from the received signal of the first transmit / receive antenna by applying the extracted characteristic value. 18. The method of claim 14 or 17, wherein extracting the characteristic value of the re-input transmission signal comprises: Until the modeled value is the same as the transmission signal re-input through the first transmission / reception antenna, modeling is performed using the modeling value and the frequency down-converted coupling signal to extract the characteristic value of the re-input transmission signal. Method for removing interference noise of a wireless repeater system, characterized in that. The method of claim 16, wherein in the reverse link, Frequency downconverting the signal received by the second transmit / receive antenna; Extracting a characteristic value of a re-input transmission signal included in a reception signal of the frequency down-converted second transmission / reception antenna using a signal obtained by frequency down-converting the signal coupled from the front end of the first transmission / reception antenna as a reference signal; Wow, And removing the re-input transmission signal from the received signal of the second transceiving antenna by applying the extracted characteristic value. 18. The method of claim 17, further comprising: determining a time delay value of the frequency down-converted coupling signal; Measuring a correlation between the signal whose time delay value is adjusted and the received signal of the first downlink antenna having the frequency down-converted value, and accumulating for a predetermined time; Comparing the accumulated autocorrelation integral value with a reference value and adjusting the time delay value until the autocorrelation integration value is smaller than the reference value until the reference value is larger than the reference value; And arranging the autocorrelation integral values larger than the reference value by time delay values, and then applying the time delay values to an adaptive compensation algorithm. 20. The method of claim 19, further comprising: determining a time delay value of the frequency down-converted coupling signal; Measuring a correlation between the signal whose time delay value has been adjusted and the received signal of the frequency down-converted second transmit / receive antenna and accumulating for a predetermined time; Comparing the accumulated autocorrelation integral value with a reference value and adjusting the time delay value until the autocorrelation integration value is smaller than the reference value until the reference value is larger than the reference value; And arranging the autocorrelation integral values larger than the reference value by time delay values, and then applying the time delay values to an adaptive compensation algorithm. 19. The method of claim 18, wherein extracting the characteristic value of the re-input transmission signal, The modeling value is repeatedly modeled using the modeling value and the frequency down-converted coupling signal until the modeled value is the same as the transmission signal re-inputted through the second transmission / reception antenna to obtain a characteristic value of the re-inputted transmission signal. Method for removing interference noise of a wireless repeater, characterized in that the extraction.

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