KR101438794B1 - Interference cancellation repeater and repeating method thereof - Google Patents

Abstract

Disclosed is an interference-cancelling repeating technique that has no signal distortion and can remove a feedback signal more precisely. According to the present invention, an interference-cancelling repeater comprises: a reception part that receives an analog signal; an A/D converter part that converts the analog signal received by the reception part into a digital signal; a channel filter part that allows only a desired band of the digital signal converted at the A/D converter part to pass through; a feedback signal removing part that removes a feedback signal included in the digital signal where only the desired band is allowed to pass through by the channel filter part; a D/A converter part that converts the digital signal, where the feedback signal is removed by the feedback signal removing part, into an analog signal; a control part that controls the channel filter part and the feedback signal removing part; and a transmission part that transmits the analog signal converted at the D/A converter part.

Description

{INTERFERENCE CANCELLATION REPEATER AND REPEATING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference cancellation repeater and a relaying method thereof. More particularly, the present invention relates to an interference cancellation repeater and a relaying method thereof that can eliminate a feedback signal without distortion of a signal and more precisely.

In a mobile communication system, a repeater is installed to cover a radio wave shadow area. In the case of a repeater not including the interference cancellation function, if the signal between the input and output antennas is not isolated, a signal output from the output antenna of the repeater is fed back as a feedback signal to the input antenna of the repeater. As a result, it is impossible to smoothly provide a signal and adversely affect the product.

To solve this problem, an interference cancellation system (ICS) repeater has been proposed. That is, the ICS repeater removes the feedback signal through digital signal processing.

However, since the conventional repeater removes the feedback signal after storing the previously set property values, there is a case that the interference cancellation repeater, which generates a difference in performance depending on the surrounding installation environment, fails to perform its performance.

Also, in case of a repeater installed in a movable place such as a moving vehicle, there is a case where the system needs to be reset according to the surrounding environment after the repeater moves, and the existing property values are fixedly stored, If the feedback signal removing operation using the value is performed, it may be impossible to smoothly supply the signal.

It is an object of the present invention to prevent oscillation of a mobile communication repeater by more precisely removing feedback signals generated due to insufficient separation distances between antennas using digital signal processing.

It is another object of the present invention to implement an interference cancellation relaying technique that can change the setting of a repeater system due to a change in installation environment.

According to an aspect of the present invention, there is provided an interference cancellation repeater including: a receiver for receiving an analog signal; An AD converter for converting an analog signal received by the receiver into a digital signal; A channel filter unit for passing only a desired band from the signal converted into the digital signal by the AD converter unit; A feedback signal canceling unit for performing a feedback signal removing operation included in the digital signal passed through only the desired band in the channel filter unit; A DA converter unit for converting the digital signal from which the feedback signal is removed in the feedback signal removing unit into an analog signal; A control unit for controlling the channel filter unit and the feedback signal remover; And a transmitter for transmitting the converted analog signal from the DA converter.

The control unit may include a database for storing information on a band through which the interference cancellation repeater can pass, and a setting value including an adaptation rate value used for interference cancellation and a window rejection window delay value. And a web server for transmitting a web page and displaying the web page on the management terminal.

An RF downconverter for downconverting the analog signal received by the receiver to an intermediate frequency band; And an RF up-converter unit for up-converting the transmission analog signal output from the DA converter unit to an RF band.

According to another aspect of the present invention, there is provided an interference cancellation relay method comprising: requesting, by an interference cancellation repeater, information necessary for interference cancellation setting to a management terminal; Storing information necessary for an interference cancellation setting received from the management terminal by the interference cancellation repeater; And setting the setting value necessary for the interference cancellation repeater to cancel the interference signal.

Wherein the step of requesting the information necessary for the interference cancellation setting includes transmitting a web page including a set value including an adaptation rate value required for interference cancellation setting or a window rejection window delay value by the interference cancellation repeater, Displaying a web page on the management terminal; And setting, by the management terminal, a setting value including the adaptation rate value or the interference cancellation window delay value necessary for interference cancellation by the interference cancellation repeater based on the displayed web page.

The set value required for the interference cancellation setting includes both the pass band width set by the interference canceller and the set value used for interference cancellation.

According to another aspect of the present invention, there is provided an interference cancellation relay method including: requesting information on a pass band to a management terminal by an interference cancellation repeater; Storing the passband information received from the management terminal by the interference cancellation repeater; The interference cancellation repeater setting a passband; And an interference cancellation repeater setting a set value required for interference cancellation according to the pass band.

Transmitting the web page including the information on the passband by the interference cancellation repeater to the information about the pass band to display the web page on the management terminal; And setting, by the management terminal, information on a band to be passed by the interference cancellation repeater based on the displayed web page.

According to the embodiment of the present invention, the feedback signal generated due to the insufficient separation distance between the antennas is more precisely removed using the digital signal processing, thereby preventing oscillation of the mobile communication repeater.

In addition, the present invention can implement an interference cancellation relaying technique that can change the setting of the repeater system due to a change in installation environment.

1 to 3 are views for explaining an interference canceller according to first and second embodiments of the present invention;
FIG. 4 and FIG. 5 are flowcharts for explaining a relaying method of an interference cancellation repeater according to the first embodiment of the present invention. FIG.
6 and 7 are flowcharts for explaining a relaying method of an interference cancellation repeater according to a second embodiment of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, the configuration and operation of an interference cancellation repeater according to an embodiment of the present invention will be described.

(Embodiment 1)

First, the configuration of an interference cancellation repeater for explaining an interference cancellation repeater will be described in detail as follows. 1 to 3 are views for explaining an interference canceller according to the first and second embodiments of the present invention.

As shown in FIG. 1, the interference canceller 100 and one or more management terminals 200 are connected via the Internet.

2, the interference cancellation repeater 100 includes a receiver 110 for receiving an analog signal, an RF downconverter for downconverting the analog signal received by the receiver 110 into an intermediate frequency band, An AD converter 130 for converting an analog signal down-converted by the RF down-converter unit 120 into a digital signal, an AD converter unit 130 for converting a digital signal into a desired band A feedback signal removing unit 150 for removing a feedback signal included in a digital signal passed through only the desired band in the channel filter unit 140, the feedback signal removing unit 150, A digital-to-analog (D / A) converter 160 for converting a digital signal from which a feedback signal has been removed into an analog signal, an RF converter 160 for up-converting the transmission analog signal output from the DA converter 160 to an RF band, A transmitter 180 for transmitting an upconverted analog signal from the RF up-converter 170, and a controller 190 for controlling the channel filter 140 and the feedback signal remover 150. [ ). The control unit 190 includes a database 191 and a web server 192 as shown in FIG.

The feedback signal cancellation unit 150 may adjust the adaptation speed value for generating the filter coefficient of the adaptive filter used to remove the feedback signal and the delay of the feedback signal cancellation window of the environment in which the feedback signal repeater is installed.

The web server 192 transmits data for a set value including an adaptation rate value required for feedback signal removal and a window rejection window delay value stored in the database 191 or a band that the interference cancellation repeater can pass or pass through To the management terminal 200 in the form of a web page. That is, the web server 192 confirms the state of the interference cancellation repeater 100 through the web browser of the management terminal 200 by the administrator of the interference cancellation repeater 100, Remove Window Allows you to set the settings including the delay value.

The database 191 stores data on a setting value including an adaptation rate value associated with the interference cancellation repeater 100 and a feedback signal cancellation window delay value. At this time, the data base 191 may transmit a setting value including an adaptation rate value used for removing the interference signal of the interference cancellation repeater 100 itself and a feedback signal cancellation window delay value, A set value including an adaptation rate value or a window removal window delay value used for removing data on a band that can be provided and an interference signal inputted from the management terminal 200 or an interference cancellation relay And stores data for a certain band.

The management terminal 200 may transmit a setting value including an adaptation rate value used for removing the interference signal of the interference cancellation repeater 100 or an interference cancellation window delay value, And a web browser capable of displaying a web page provided with status information including data on a band. At this time, the management terminal 200 is configured as a device capable of data communication through a wired or wireless Internet 300, such as a personal computer, a notebook, and a personal portable terminal.

Hereinafter, a method of relaying an interference cancellation repeater according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 4 and 5 are flowcharts for explaining a relaying method of an interference cancellation repeater according to the first embodiment of the present invention.

First, the interference cancellation repeater 100 requests the management terminal 200 for information necessary for interference cancellation setting (S400). The step of requesting the information necessary for the interference cancellation setting will be described in more detail as follows.

When the manager requests to set / change the set value required for the interference cancellation setting of the interference canceller 100 through the management terminal 200, the interference canceller 100 transmits the adaptation rate value or the interference signal To the management terminal 200, a web page including its own status information including information about a setting value including a window delay value or a bandwidth that the interference cancellation repeater 100 can pass. The management terminal 200 displays on the management terminal 200 a web page including a setting value including an adaptation rate value required for interference cancellation received from the interference cancellation repeater 100 or a ringing signal cancellation window delay value S410).

In step S420, the manager sets the set value including the adaptation rate value required for interference cancellation or the window deletion window delay value required for interference cancellation through the management terminal 200 (step S420). At this time, the manager refers to the passable band of the interference canceling repeater 100 displayed, and sets a setting value including an adaptation rate value required for interference cancellation or a window rejection window delay value. Here, the management terminal 200 may set a value including an adaptation rate value related to a passable band or a windowed window delay value to a value including a passband, an adaptation rate value, or a windowed window delay value At the same time, input from the manager. In addition, the administrator can confirm information on the setting value including the adaptation rate value or the window removal window delay value stored in the management terminal 200 on the web browser.

The interference cancellation repeater 100 stores information including the adaptation rate value or the interference cancellation window delay value required for the interference cancellation setting received from the management terminal 200 at step S430. That is, the interference cancellation repeater 100 receives from the management terminal 200 a set value including the adaptation rate value or the window removal window delay value set in step S420. The interference cancellation repeater 100 stores in the database 191 a set value including the received adaptation rate value or the interference cancellation window delay value. At this time, when the passband and the set value are input simultaneously to the set value including the adaptation rate value related to the passable band or the window rejection window delay value related to the passable band from the management terminal 200, Band and an adaptation rate value or a window delay value.

The interference cancellation repeater 100 sets a setting value including an adaptation rate value required for interference cancellation or a window rejection window delay value (S440). In other words, the interference cancellation repeater 100 uses the set value including the adaptation rate value or the interference cancellation window delay value necessary for canceling the interference signal stored in the database 191 to remove the feedback signal from the feedback signal canceller 150 An adaptation rate value used for the window signal removal window delay value, or an adaptation rate value used for the window signal removal window delay value (S440).

(Second Embodiment)

The configuration of the interference canceller for explaining the interference canceller is described in the first embodiment, and a detailed description thereof will be omitted. A relay method of an interference cancellation repeater according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. 6 and 7 are flowcharts for explaining a method of relaying an interference cancellation repeater according to a second embodiment of the present invention.

First, the interference cancellation repeater 100 requests the management terminal 200 for information on the passband (S500). The step of requesting the information on the pass band will be described in more detail as follows.

When the manager requests the passband setting / changing of the interference cancellation repeater 100 through the management terminal 200, the interference canceller 100 transmits a web page showing its own status information including information on the passable band To the management terminal (200). The management terminal 200 displays a web page including information on the passable band received from the interference cancellation repeater 100 on the management terminal 200 (S510).

The manager confirms the information on the band through which the interference cancellation repeater 100 can pass through the management terminal 200 on the web browser and sets a band to pass through (S520).

The interference cancellation repeater 100 stores the passband information received from the management terminal 200 (S530). That is, the interference cancellation repeater 100 receives the information on the pass band set in the above-described step S520 from the management terminal 200. The interference cancellation repeater 100 stores the received passband information in the database 191. At this time, the interference cancellation repeater 100 checks whether the passband is changed (S540). If the passband is not changed, there is no set value to be changed, so no action is taken. If the passband is changed, an attribute value including an adaptation rate value or a ringing signal removal window delay value necessary for removing the interference signal associated with the passband is set in the database 191 at operation S550.

As described above, the interference cancellation repeater and the relay method according to the present invention are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that various modifications may be made. All or some of them may be selectively combined.

100: interference cancellation repeater
110:
120: RF downconverter unit
130: AD converter section
140: Channel filter section
150: feedback signal rejection
160: DA converter section
170: RF up-converter unit
180:
190:
191: Database
192: Web server
200: management terminal

Claims (8)

A receiver for receiving an analog signal;
An AD converter for converting an analog signal received by the receiver into a digital signal;
A channel filter unit for passing only a desired band from the signal converted into the digital signal by the AD converter unit;
A feedback signal canceling unit for performing a feedback signal removing operation included in the digital signal passed through only the desired band in the channel filter unit;
A DA converter unit for converting the digital signal from which the feedback signal is removed in the feedback signal removing unit into an analog signal;
A control unit for controlling the channel filter unit and the feedback signal remover; And
And a transmitting unit for transmitting the converted analog signal from the DA converter unit,
Wherein,
A database storing information on a band through which the interference cancellation repeater can pass and a setting value including an adaptation speed value used for interference cancellation and a feedback signal cancellation window delay value; And
And a web server for transmitting the web page and displaying the web page on the management terminal. delete The method according to claim 1,
An RF downconverter for downconverting the analog signal received by the receiver to an intermediate frequency band; And
And an RF up-converter for up-converting the transmission analog signal output from the DA converter to an RF band. Requesting, by the interference cancellation repeater, information including an adaptation rate value or a feedback signal cancellation window delay value necessary for interference cancellation setting to the management terminal;
Storing information including an adaptation rate value or a feedback signal removal window delay value necessary for the interference cancellation setting received from the management terminal by the interference cancellation repeater; And
Wherein the interference cancellation repeater includes a setting value including an adaptation rate value required for interference cancellation or a feedback signal cancellation window delay value. The method of claim 4,
In the step of requesting the information including the adaptation rate value or the feedback signal removal window delay value necessary for the interference cancellation setting,
Transmitting, by the interference cancellation repeater, a web page including a setting value including an adaptation rate value required for interference cancellation setting or a feedback signal cancellation window delay value to display the web page on the management terminal; And
And setting the set value including the adaptation rate value or the feedback signal removal window delay value required for interference cancellation by the interference cancellation repeater based on the displayed web page by the management terminal Removal Relay Method. The method of claim 5,
The set value including the adaptation rate value required for the interference cancellation setting or the feedback signal cancellation window delay value is set to "
Wherein the interference cancellation repeater concurrently includes a passband width set by the interference canceller and an adaptation rate value or a feedback signal cancellation window delay value used for canceling an interference signal. Requesting information on a passband to the management terminal by an interference cancellation repeater;
Storing the passband information received from the management terminal by the interference cancellation repeater;
The interference cancellation repeater setting a passband; And
Wherein the interference cancellation repeater sets an adaptation rate value or a feedback signal cancellation window delay value necessary for interference cancellation according to the passband. The method of claim 7,
In the step of requesting information on the passband,
Transmitting a web page including information on a pass band by the interference cancellation repeater and displaying the web page on the management terminal; And
And setting information about a band to be passed by the interference cancellation repeater based on the displayed web page by the management terminal.

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