WO2016108449A1 - Interference cancellation repeater - Google Patents

Abstract

An interference cancellation repeater in one aspect according to the technical concept of the present invention comprises: a first transmission and reception processing unit for converting an RF input signal, inputted via a link antenna which is communicatively coupled to a base station, to a digital input signal; an interference cancellation unit for outputting an interference cancellation signal by cancelling an interference signal from the digital input signal; a second transmission and reception processing unit for converting the interference cancellation signal to an RF output signal and amplifying the RF output signal; and a gain control unit for detecting a gain change of the interference cancellation repeater on the basis of the interference cancellation signal, and if a gain change of the interference cancellation repeater is detected, changing the current gain of the interference cancellation repeater to a target gain by controlling the intensity of at least one of the RF input signal, the interference cancellation signal and the RF output signal.

Description

Interference elimination relay

The technical idea of the present invention relates to an interference cancellation relay device, and more particularly, to an interference cancellation relay device for controlling the gain of the interference cancellation relay device to a constant level.

In general, in order to extend service coverage or improve service quality of a base station, a relay device is used in a radio shadow area where signal strength is weak or hard to reach. An example of a relay device may be a radio frequency (RF) relay device, and the RF relay device receives a base station signal transmitted from a base station through a link antenna and then amplifies and transmits the signal to a terminal through a service antenna. The signal transmitted from the base station is received through the service antenna, amplified and transmitted to the base station through the link antenna, thereby relaying the communication between the base station and the terminal.

The RF relay device has an advantage of being easy to install because it transmits and receives signals wirelessly through the link antenna and the service antenna with the base station and the user terminal, respectively, but due to the interference between the link antenna and the service antenna, Oscillation may occur due to deterioration, repeated reception and amplification of degraded signals, and there is a problem in that the output gain is limited. In addition, the isolation between the link antenna and the service antenna due to spatial constraints due to the demand for miniaturization ) Was difficult to secure.

As an alternative, an interference cancellation relay device has been proposed. The interference elimination relay apparatus estimates interference signals, for example, signals radiated through a service antenna (or link antenna), re-input to the link antenna (or service antenna) through various paths, and estimates the estimated signal. Can be used to remove interference from the input signal to increase isolation. Accordingly, the interference elimination relay device has an advantage of increasing output gain, preventing oscillation, and miniaturization.

On the other hand, when the interference elimination relay apparatus normally provides a service after initialization of the interference elimination relay apparatus, when the strength of the signal transmitted from the base station or the user terminal is changed due to an environmental effect, the isolation between the link antenna and the service antenna is When the gain of the interference elimination relay is changed for various reasons such as the case of change, the stability of the service is secured by adjusting the changed gain to an optimal level required for the interference elimination relay.

In general, the interference elimination relay device changes the gain to a predetermined gain level at an instant in adjusting the gain in response to the gain change, in which case the speed of estimating the interference signals does not correspond to the change in the gain level. There was a problem that signals cannot be estimated, which causes the interference cancellation relay to fail to remove the interference signal from the input signal.

The technical problem to be achieved by the technical idea of the present invention is to provide an interference canceling relay device that can stably remove an interference signal, and can provide stable service and constant coverage by maintaining a gain at a predetermined level.

According to an aspect of the inventive concept, an apparatus for eliminating interference according to an aspect of the present invention may include: a first apparatus for converting an RF (radio frequency) input signal input through a link antenna communicatively coupled to a base station into a digital input signal; Transmission and reception processing unit; An interference canceling unit which removes an interference signal from the digital input signal and outputs an interference cancellation signal; A second transmission / reception processor converting the interference cancellation signal into an RF output signal and amplifying the RF output signal; And detecting a gain change of the interference cancellation relay device based on the interference cancellation signal, and when a gain change of the interference cancellation relay device is detected, an intensity of at least one of the RF input signal, the interference cancellation signal, and the RF output signal. And a gain controller configured to change the current gain of the interference cancellation relay device to a target gain through adjustment.

In some embodiments, the gain control unit may change the current gain of the interference cancellation relay device at a constant rate of change for a predetermined time up to the target gain.

In some embodiments, the rate of change may have an integer scale or a logarithmic scale.

In some embodiments, the gain controller may change the current gain of the interference cancellation relay device non-linearly for a predetermined time up to the target gain.

In some embodiments, the preset time may be divided into a plurality of sections, and the gain control unit is further configured to mutually increase the current gain of the interference cancellation relay device in at least two or more of the plurality of sections up to the target gain. Can be changed at different rates of change.

In some embodiments, the preset time may be divided into a plurality of sections, and the gain control unit stepswise the current gain of the interference elimination relay device in the plurality of sections up to the target gain. Can change.

In some embodiments, the gain controller may include: a gain change detector configured to detect a gain change of the interference cancellation relay device based on the interference cancellation signal; A target gain calculator configured to calculate a target gain of the interference cancellation relay device when a gain change of the interference cancellation relay device is detected; And a controller configured to gradually change the current gain of the interference cancellation relay device to a calculated target gain by adjusting the strength of at least one of the RF input signal, the interference cancellation signal, and the RF output signal.

In some embodiments, the gain change detector may further detect a gain change of the interference elimination relay device based on a control command of an administrator.

In some embodiments, the target gain calculator may include: an amplitude of the interference cancellation signal, a maximum output of the interference cancellation relay, an isolation between the link antenna and a service antenna communicatively coupled to the user terminal, and an administrator. A target gain of the interference elimination relay apparatus may be calculated based on at least one of input information of.

In some embodiments, the first transceiving processor may include: a first amplifier configured to low noise amplify the RF input signal; A first attenuator for adjusting the strength of the low noise amplified RF input signal; And an analog / digital converter for converting the intensity-controlled RF input signal into the digital input signal. The gain control unit may control the first attenuator to adjust the strength of the RF input signal.

In some embodiments, the interference canceller may include: a canceller configured to remove the interference signal from the digital input signal and output the interference cancellation signal; And a second attenuator for adjusting the strength of the interference cancellation signal, wherein the gain controller controls the second attenuator to adjust the strength of the interference cancellation signal.

In some embodiments, the second transmit / receive processor includes: a digital / analog converter for converting the interference cancellation signal into the RF output signal; A third attenuator for adjusting the strength of the RF output signal; And a second amplifier for amplifying the intensity-controlled RF output signal, wherein the gain controller may control the third attenuator to adjust the intensity of the RF output signal.

The interference elimination relay device according to the technical concept of the present invention can stably estimate and remove an interference signal by gradually changing the gain changed at the time of gain change to an optimal gain level required for the interference elimination relay device and keeping it constant. It can provide services and certain coverage.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating a relay environment of an interference canceling relay device according to an exemplary embodiment of the inventive concept.

2 is a block diagram schematically illustrating an interference cancellation relay device according to an embodiment of the inventive concept.

3 is a view for explaining a part of the configuration of the interference cancellation relay of FIG.

4 is a diagram for describing an example of gradual gain control of the gain controller of FIG. 2.

5 is a flowchart illustrating a gain control method of an interference cancellation relay device according to an embodiment of the inventive concept.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, the terms "~ unit (unit)", "~ group", "~ ruler", "~ module", etc. described herein means a unit for processing at least one function or operation, which is hardware or software Or a combination of hardware and software.

In addition, it is intended to clarify that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by.

An interference cancellation relay device according to an embodiment of the inventive concept may support mobile communication services used worldwide. For example, the interference elimination relay device may be a frequency and FDD scheme such as Very High Frequency (VHF), Ultra High Frequency (UHF), 700 MHz, 800 MHz, 850 MHz, 900 MHz, 1900 MHz, 2100 MHz band, and 2600 MHz band. In addition to the services of the TDD can support the service. In addition, the interference elimination relay device may include a typical analog mobile communication service (AMPS), a digital time-division multiplexing access (TDMA), and a code division multiple access (CDMA). ), Asynchronous CDMA (Wideband Code Division Multiple Access, WCDMA), High Speed Downlink Packet Access (HSDPA), Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A) It can support many mobile communication services.

Hereinafter, embodiments of the present invention will be described in detail.

1 is a diagram illustrating a relay environment of an interference canceling relay device according to an exemplary embodiment of the inventive concept.

Referring to FIG. 1, the interference elimination relay 10 may amplify an RF input signal received through a link antenna LA in a downlink and transmit the amplified RF input signal to a user terminal MS through a service antenna SA. . In this case, the RF input signal may include an interference signal in which base station signals transmitted from the base station (BTS) and signals radiated through the service antenna SA are re-input to the link antenna LA, and the base station signal and the interference signal. Are amplified together by a high power amplifier (not shown), so that the interference elimination relay device 10 can oscillate. The interference elimination relay apparatus 10 includes an interference canceller 130 (see FIGS. 2 and 3) capable of estimating the interference signal and removing the interference signal from the RF input signal at the link antenna LA side. Can solve the rash problem.

The interference elimination relay apparatus 10 may receive, for example, a link antenna LA due to environmental influences as it receives signals wirelessly through the link antenna LA or the service antenna SA, as shown in FIG. 1. When the strength of the RF input signal input to the service antenna (SA) is different, when the isolation between the link antenna (LA) and the service antenna (SA) is different, when the administrator changes the gain, the initial power is applied to the output If the administrator is operating normally after the initialization work is performed in the absence of the state, when the administrator stops the operation of the interference elimination relay 10 for the purpose of changing the operation status, equipment inspection, repair, etc. The gain may be varied in various cases, such as when saturation occurs due to a failure to remove the interfering signal. At this time, for normal operation of the interference cancellation relay 10, the changed gain must be adjusted to a predetermined level (for example, an optimum gain level required for the interference cancellation relay 10). However, if the current gain of the interference elimination relay 10 is changed to a predetermined level at once, the interference elimination unit 130 (see FIGS. 2 and 3) fails to estimate the interference signal and normally generates an interference signal from the input signal. You may not be able to remove it.

The interference elimination relay apparatus 10 according to the technical spirit of the present invention gradually changes the gain of the changed interference elimination relay apparatus 10 to an optimal level when the gain change is detected through the gain control unit 170 for various reasons. The interference cancellation unit 130 (see FIGS. 2 and 3) may normally remove the interference signal. In addition, the interference elimination relay apparatus 10 may maintain the gain of the interference elimination relay apparatus 10 at an optimal level through the gain control unit 170, thereby securing the constant coverage and the service stability. It will be described below in detail with reference to FIG.

Meanwhile, in the case of uplink, the interference elimination relay apparatus 10 may amplify an RF input signal received through the service antenna SA and transmit the amplified RF input signal to the base station BTS through the link antenna LA. Although not shown in FIG. 1, even in the uplink, signals radiated through the link antenna LA may be input to the service antenna SA through a wireless environment to form an interference signal. The interference cancellation relay device 10 may be oscillated as the signal of the user terminal (MS) and the interference signal are included in the input signal received through a) and amplified together by the high output amplifier. In addition, as described above, the interference cancellation relay device 10 may have a change in gain for various reasons, and there is a need to adjust the gain accordingly.

Although not shown in FIG. 1, the interference elimination relay 10 removes an interference signal in the uplink through the interference cancellation unit 130 (see FIGS. 2 and 3) in the downlink to prevent oscillation. In addition, the gain control unit 170 (see FIGS. 2 and 3) may adjust the gain of the interference elimination relay 10 to ensure service stability. However, the technical idea of the present invention is not limited thereto, and the interference elimination relay 10 may include at least one of an interference cancelation unit and a gain control unit separately for each of the downlink and the uplink.

2 is a block diagram schematically illustrating an interference cancellation relay device according to an embodiment of the inventive concept. In FIG. 2, for convenience of explanation, the interference elimination relay apparatus 10 will be described based on the signal processing of the downlink path, and the signal elimination of the uplink path in the interference elimination relay apparatus 10 may be applied to the signal processing of the downlink path. Corresponding details are omitted here. Meanwhile, in FIG. 2, the interference elimination relay 10 is provided with one link antenna LA and one service antenna SA for convenience of description, but the present invention is not limited thereto. Each may have at least two link antennas and a service antenna. In this case, the interference canceling unit described later may be individually implemented for each signal path between the link antenna and the service antenna corresponding to each other, or may be integrally implemented for at least two signal paths. Similarly, the gain control unit described later may be individually implemented for each signal path between the link antenna and the service antenna corresponding to each other, or may be integrally implemented for at least two signal paths.

Referring to FIG. 2, the interference cancellation relay device 10 includes a link antenna LA, a first transmission / reception processing unit 110, an interference cancellation unit 130, a second transmission / reception processing unit 150, a gain control unit 170, and a service. It may include an antenna (SA).

The first transceiving processor 110 may receive an RF input signal through a link antenna LA communicatively coupled to a base station BTS (see FIG. 1). The RF input signal may include an interference signal in which a signal radiated through a base station signal and a service antenna SA is re-input to the link antenna LA.

The first transmission / reception processor 110 may adjust the strength of the RF input signal. The first transmission / reception processor 110 may include a first attenuator 113 and may adjust the strength of the RF input signal through the first attenuator 113.

The first transceiving processor 110 may convert the RF input signal whose intensity is adjusted by the first attenuator 113 into a digital input signal and output the digital input signal.

The interference cancellation unit 130 may output the interference cancellation signal by removing the interference signal from the output signal of the first transmission / reception processing unit 110, that is, the digital input signal. In detail, the interference canceller 130 may estimate a signal corresponding to the interference signal based on the digital input signal from which the interference signal has been removed. The interference canceller 130 may remove the interference signal from the digital input signal by using the generated estimation signal. The interference cancellation unit 130 may output the interference cancellation signal corresponding to the digitized base station signal as the signal from which the interference signal is removed from the digital input signal.

The interference canceller 130 may adjust the strength of the interference canceled signal. The interference canceller 130 may include a second attenuator 133 and adjust the strength of the interference canceled signal through the second attenuator 133.

The second transmit / receive processor 150 may convert the output signal of the interference canceller 130, that is, the interference canceled signal, into an RF output signal that is an analog signal.

The second transmit / receive processor 150 may include a third attenuator 153 and adjust the strength of the RF output signal through the third attenuator 153. The second transmit / receive processor 150 may amplify the RF output signal adjusted by the third attenuator 153 and transmit the RF output signal through a service antenna SA communicatively coupled to the user terminal MS (see FIG. 1). Can be.

The gain controller 170 may detect a change in gain of the interference canceling relay device 10 based on an output signal of the interference canceller 130, that is, the interference cancel signal or an administrator's control command. If detected, the target gain may be calculated to adjust the gain of the interference cancellation relay 10 to a predetermined level.

The gain control unit 170 calculates a current gain (gain in a changed state) of the interference cancellation relay 10 by adjusting the intensity of at least one of the RF input signal, the interference cancellation signal, and the RF output signal. Can change gradually. In detail, the gain control unit 170 may include a first attenuator 113 of the first transmission / reception processing unit 110, a second attenuator 133 of the interference cancellation unit 130, and a third of the second transmission / reception processing unit 150. At least one of the attenuators 153 may be controlled, thereby gradually adjusting the intensity of at least one of the signals input to each of the first to third attenuators 153, thereby providing a current gain of the interference cancellation relay 10. Can be gradually changed to the calculated target gain.

FIG. 3 is a diagram for describing a part of the configuration of the interference cancellation relay of FIG. 2. 4 is a diagram for describing an example of gradual gain control of the gain controller of FIG. 2. 3 and 4, the same reference numerals as in FIG. 2 represent the same configuration, and thus, the same reference numerals will be described with reference to FIG. 2, but redundant descriptions will be omitted, and the first transmission / reception processor 110 and the interference canceling unit ( 130, the second transmission / reception processing unit 150 and the gain control unit 170 will be described based on the configurations shown in more detail.

2 and 3, the first transmit / receive processor 110 may include a first amplifier 111, a first attenuator 113, and an analog / digital converter 115. The first amplifier 111 may amplify the RF input signal input to the interference elimination relay 10 through the link antenna LA by low noise amplification, ie, minimizing noise of the RF input signal. The first attenuator 113 may adjust the strength of the amplified RF input signal. Here, the first attenuator 113 may be configured as an analog attenuator. The analog / digital converter 115 may convert the intensity-adjusted RF input signal into a digital input signal.

On the other hand, although not shown in Figure 3, the first transmission and reception processing unit 110, a filter for selecting a frequency band required for the RF input signal in front of the first amplifier 111, the first attenuator 113 and analog It may further include a frequency down converter for converting the intensity-adjusted RF input signal between the / digital converter 115 into a signal of an intermediate frequency band. Here, the frequency down converter may be optionally omitted.

The interference canceller 130 may include a canceller 131 and a second attenuator 133. The canceller 131 may remove the interference signal from the digital input signal. The canceller 131 may generate an estimated signal corresponding to the interference signal based on its output signal, that is, the interference cancellation signal from which the interference signal is removed from the digital input signal, and using the generated estimation signal. The interference cancellation signal may be output by removing the interference signal from the digital input signal. The second attenuator 133 may adjust the strength of the interference cancellation signal. Here, the second attenuator 133 may be configured as a digital attenuator.

The second transmit / receive processor 150 may include a digital-to-analog converter 151, a third attenuator 153, and a second amplifier 155. The digital-to-analog converter 151 may convert the output signal of the interference canceller 130, that is, the interference cancellation signal, into an RF output signal by analogizing the output signal. The third attenuator 153 may adjust the strength of the RF output signal. Here, the third attenuator 153 may be configured as an analog attenuator. The second amplifier 155 may amplify the intensity-adjusted RF output signal. The second amplifier 155 may be configured as a high power amplifier.

Although not shown in FIG. 3, the second transmission / reception processor 150 may include the digital / analog converter 151 and the third attenuator 153 when the first transmission / reception processor 130 includes a frequency down converter. A frequency up converter may be included between the digital / analog converters 151, and the digital to analog converter 151 may convert the interference cancellation signal into an intermediate frequency band output signal, and the frequency up converter converts the intermediate frequency band. The RF output signal may be output by up-converting an output signal into a signal in a radio frequency band. In addition, although not shown in FIG. 3, the second transmit / receive processor 150 may further include an isolator for protecting the second amplifier 155 after the second amplifier 155.

The gain controller 170 may include a gain change detector 171, a target gain calculator 173, and a controller 175.

The gain change detector 171 may detect a change in the gain of the interference cancellation relay 10 based on the output signal of the interference canceller 130, that is, the interference cancellation signal.

In some embodiments, the gain change detector 171 may detect a change in gain of the interference elimination relay 10 by measuring a change in the magnitude of a signal input through the link antenna LA. Here, the gain change detector 171 may measure, for example, a power of a peak signal of the interference canceled digital input signal, an average power of the interference canceled digital input signal, or a user of the interference canceled digital input signal. Regardless of the change in the amount of data, the change in the size of the signal input through the link antenna LA may be measured by measuring the power of a signal having a constant size (for example, a synchronization signal or a power indication signal).

In another embodiment, the gain change detector 171 may detect a change in gain of the interference elimination relay 10 by measuring a change in isolation between the link antenna LA and the service antenna SA. Here, the gain change detector 171 may calculate a degree of isolation change by calculating a correlation between the interference cancellation signal and the RF input signal input through the link antenna LA.

In another embodiment, the gain change detector 171 may determine whether the interference cancellation relay 10 is saturated to detect a change in gain of the interference cancellation relay 10.

In some implementations, the gain change detector 171 may detect a change in gain of the interference elimination relay 10 without using the interference canceled digital input signal. For example, the gain change detector 171 may change the gain of the interference cancellation relay 10 based on a control command of the administrator for changing the gain, interrupting operation of the interference cancellation relay 10, gain change information, or the like. Can be detected.

The target gain calculator 173 may calculate a target gain of the interference cancellation relay 10 when the gain change of the interference cancellation relay 10 is detected by the gain change detector 171. Here, the target gain may have a value corresponding to the gain required for the interference elimination relay 10, that is, the optimum gain. The optimum gain may be preset by an administrator and may be changed according to an operating environment of the interference elimination relay device 10.

The target gain calculator 173 may include at least one of a magnitude of the interference cancellation signal, a maximum output of the interference cancellation relay device, isolation between a link antenna LA and a service antenna SA, and input information of a manager. In consideration of one, the target gain may be calculated. That is, the target gain calculator 173 may calculate the target gain in consideration of the factor corresponding to the cause of the gain change.

For example, the target gain calculator 173 may adjust the target gain in consideration of the rated input size of the interference cancellation signal when the size of the RF input signal is changed and the gain of the interference cancellation relay 10 is changed. Can be calculated. As another example, the target gain calculator 173 may change the isolation between the link antenna LA and the service antenna SA so that the gain of the interference eliminating relay 10 may be changed. The target gain may be calculated in consideration of the optimum degree of isolation required between and the service antenna SA.

The controller 175 may gradually change the current gain of the interference cancellation relay 10 to the calculated target gain. The controller 175 may adjust the strength of at least one of the RF input signal, the interference cancellation signal, and the RF output signal so that the current gain of the interference cancellation relay 10 changes gradually. The controller 175 may include at least one of the first attenuator 113 of the first transmit / receive processor 110, the second attenuator 133 of the interference canceller 130, and the third attenuator 153 of the second transmit / receive processor 150. One can be controlled to adjust the strength of the signal input to each attenuator.

Referring to FIG. 4 further, the control unit 175, as shown in (a) and (b) of FIG. 4, the current gain of the interference elimination relay 10 at a constant change rate for a predetermined time to the target gain. Can change. That is, the controller 175 linearly changes the intensity of at least one of the RF input signal, the interference cancellation signal, and the RF output signal, so that the current gain of the interference cancellation relay 10 is preset to a target gain. It can be changed at a constant rate of change over time. Here, the rate of change may have an integer scale (FIG. 4A) or a logarithmic scale (FIG. 4B).

As illustrated in FIGS. 4C and 4D, the controller 175 may change the current gain of the interference elimination relay device 10 non-lineary for a predetermined time until the target gain. It may be. That is, the controller 175 non-linearly changes the strength of at least one of the RF input signal, the interference cancellation signal, and the RF output signal, so that the current gain of the interference cancellation relay 10 is preset to a target gain. It may be allowed to change nonlinearly over time.

For example, the controller 175 may change the current gain of the interference elimination relay 10 to a different rate of change in at least two or more of the plurality of time intervals up to the target gain (FIG. 4C). As another example, the controller 175 may stepwise change the current gain of the interference elimination relay 10 to a target gain in a plurality of time intervals.

As such, when the gain change of the interference cancellation relay 10 is detected through the gain control unit 170, the interference cancellation relay 10 gradually adjusts the signal strength in the analog processing step or the digital processing step to remove the interference. The gain of the relay device 10 can be gradually changed to the desired optimum gain level.

Accordingly, the interference canceling unit 130 can stably remove and output the interference signal, and the gain of the interference canceling relay device 10 that is changed for various reasons can be constantly maintained at an optimum gain level, thereby eliminating interference Device 10 can provide stable service and constant coverage.

5 is a flowchart illustrating a gain control method of an interference cancellation relay device according to an embodiment of the inventive concept. Referring to FIG. 5, a gain control method of an interference cancellation relay device according to an exemplary embodiment of the present invention may include steps performed in time series by the interference cancellation relay device 10 illustrated in FIGS. 1 to 3. It consists of. Therefore, even if omitted below, it can be seen that the above description of the interference cancellation relay 10 shown in FIGS. 1 to 3 also applies to the input gain control method of FIG. 5.

In step S5100, the interference elimination relay 10 detects a change in gain. The interference elimination relay device 10 measures the change in the size of a signal input through the link antenna LA, the change in the isolation between the link antenna LA and the service antenna SA, and the like to remove the interference elimination relay device 10. Detect changes in gain.

In step S5300, the interference elimination relay device 10 calculates a target gain of the interference elimination relay device 10 according to an optimum gain required for the interference elimination relay device 10. Here, the interference elimination relay 10 may calculate the target gain in consideration of the cause of the gain change.

In step S5500, the interference elimination relay device 10 gradually adjusts the intensity of the signal inputted to the interference elimination relay device 10 in the analog processing step and / or the digital processing step to present the current of the interference elimination relay device 10. Gradually change the gain to the target gain.

As the gain of the interference elimination relay 10 gradually changes to an optimal level, the interference elimination unit 130 may stably remove the interference signal from the input signal. In addition, as the gain of the interference cancellation relay 10 is constantly maintained at an optimal level, the interference cancellation relay 10 may provide stable service and constant coverage.

In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications and changes by those skilled in the art within the spirit and scope of the present invention. This is possible.

Claims (12)

Interference elimination relay device, A first transmission / reception processor for converting an RF (radio frequency) input signal input through a link antenna communicatively coupled to a base station into a digital input signal; An interference canceling unit which removes an interference signal from the digital input signal and outputs an interference cancellation signal; A second transmission / reception processor converting the interference cancellation signal into an RF output signal and amplifying the RF output signal; And Detect a gain change of the interference cancellation relay based on the interference cancellation signal, and adjust the intensity of at least one of the RF input signal, the interference cancellation signal, and the RF output signal when a gain change of the interference cancellation relay is detected. A gain control unit for changing a current gain of the interference cancellation relay device to a target gain through a control unit; Interference cancellation relay device comprising a. According to claim 1, The gain control unit, And change the current gain of the interference cancellation relay at a constant rate of change for a predetermined time up to the target gain. The method of claim 2, The change rate is, An interference cancellation relay device having an integer scale or a logarithmic scale. According to claim 1, The gain control unit, And change the current gain of the interference cancellation relay device non-linearly for a predetermined time up to the target gain. The method of claim 4, wherein The preset time is, Divided into a plurality of sections, The gain control unit, Changing the current gain of the interference cancellation relay device to a different rate of change in at least two or more of the plurality of sections to the target gain. The method of claim 4, wherein The preset time is, Divided into a plurality of sections, The gain control unit, And stepwise vary the current gain of the interference cancellation relay device in the plurality of sections to the target gain. According to claim 1, The gain control unit, A gain change detector configured to detect a gain change of the interference cancellation relay based on the interference cancellation signal; A target gain calculator configured to calculate a target gain of the interference cancellation relay device when a gain change of the interference cancellation relay device is detected; And A control unit which adjusts the intensity of at least one of the RF input signal, the interference cancellation signal, and the RF output signal to gradually change the current gain of the interference cancellation relay device to a calculated target gain; Interference cancellation relay device comprising a. The method of claim 7, wherein The gain change detection unit, Further detecting a change in gain of the interference canceling relay device based on a control command of an administrator. The method of claim 7, wherein The target gain calculation unit, The interference based on at least one of a magnitude of the interference cancellation signal, a maximum output of the interference cancellation relay device, an isolation between the link antenna and a service antenna communicatively coupled to a user terminal, and input information of an administrator An interference cancellation relay device for calculating a target gain of the cancellation relay device. According to claim 1, The first transmission and reception processing unit, A first amplifier for low noise amplifying the RF input signal; A first attenuator for adjusting the strength of the low noise amplified RF input signal; And And an analog / digital converter for converting the intensity controlled RF input signal into the digital input signal. The gain control unit, And controlling the first attenuator to adjust the strength of the RF input signal. According to claim 1, The interference cancellation unit, A remover for removing the interference signal from the digital input signal to output the interference cancellation signal; And And a second attenuator for adjusting the strength of the interference cancellation signal. The gain control unit, And controlling the second attenuator to adjust the strength of the interference cancellation signal. According to claim 1, The second transmission and reception processing unit, A digital to analog converter for converting the interference cancellation signal to the RF output signal; A third attenuator for adjusting the strength of the RF output signal; And And a second amplifier for amplifying the intensity adjusted RF output signal. The gain control unit, And controlling the third attenuator to adjust the strength of the RF output signal.

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