KR101847570B1 - Interference cancellation repeater for adjusting signal delay amount and method for adjusting signal delay amount - Google Patents

Interference cancellation repeater for adjusting signal delay amount and method for adjusting signal delay amount Download PDF

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Publication number
KR101847570B1
KR101847570B1 KR1020140185011A KR20140185011A KR101847570B1 KR 101847570 B1 KR101847570 B1 KR 101847570B1 KR 1020140185011 A KR1020140185011 A KR 1020140185011A KR 20140185011 A KR20140185011 A KR 20140185011A KR 101847570 B1 KR101847570 B1 KR 101847570B1
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signal
interference cancellation
interference
input
gain
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KR1020140185011A
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Korean (ko)
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KR20160075254A (en
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이현범
강상욱
김현채
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주식회사 쏠리드
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15578—Relay station antennae loop interference reduction by gain adjustment

Abstract

The present invention relates to an interference cancellation repeater and a delay amount adjustment method, and more particularly, to an interference cancellation repeater and a delay amount adjustment method capable of adjusting a delay amount. The interference cancellation repeater generates interference cancellation information by using an interference cancellation signal, an interference cancellation signal, and an interference cancellation signal. The interference cancellation signal is generated by removing an interference signal included in a received input signal. And a control unit for controlling the amplified signal corresponding to one of the input signal and the interference cancellation signal to be transmitted. The interference cancellation repeater and the delay amount adjustment method according to the present invention can control the amount of delay of a transmitted signal, so that the amount of data to be transmitted can be maintained.

Figure R1020140185011

Description

[0001] The present invention relates to an interference cancellation repeater capable of adjusting a delay amount and a delay amount adjusting method thereof,

The present invention relates to an interference cancellation repeater and a delay amount adjustment method, and more particularly, to an interference cancellation repeater and a delay amount adjustment method capable of adjusting a delay amount.

In general, a mobile communication repeater plays a role of intermediate amplification between a base station and a mobile station (mobile communication terminal) when a distance from the base station is poor due to a poor radio wave environment, thereby expanding a service area of the corresponding base station. Such a repeater has a problem that the performance of the repeater is remarkably deteriorated due to the oscillation phenomenon in which the signal transmitted by the repeater returns to the input side and is then amplified again. Therefore, an optical repeater that draws the input signal from the base station and connects the optical cable is mainly used. However, optical repeaters have a disadvantage of high construction and maintenance costs.

The repeater that solves this problem is an interference canceller (ICS Repeater). In the interference cancellation method, there are a method of removing interference using a signal processing method and a method of using an interference cancellation antenna or polarization, but a method using a signal processing technique is the mainstream. For the interference cancellation repeater, a number of prior arts are disclosed in Korean Patent Laid-Open No. 10-2012-0078129 and Korean Patent Laid-Open No. 10-2011-0007481. The interference cancellation repeater directly detects and removes the interference signal generated in the radio section, thereby providing a stable communication service. Therefore, the interference cancellation repeater is installed not only in a rural area, a highway, etc. where an optical repeater is difficult to install, but also in a downtown area where wireless environment is poor, thereby expanding a mobile communication service area.

Since the interference canceller eliminates the interference signal from the input signal, the delay of the signal is significantly larger than that of the general repeater that outputs the signal without interference elimination. As a result, the data transmission amount per unit time is reduced, There is a problem in that the quality of the product is deteriorated.

1. Korean Patent Publication No. 10-2012-0078129 2. Korean Patent Publication No. 10-2011-0007481

In order to solve the above problems, the present invention provides an interference cancellation repeater and a delay amount adjustment method capable of adjusting a delay amount of a signal.

According to an aspect of the present invention, there is provided an interference eliminator for generating an interference cancellation signal by removing an interference signal included in a received input signal; And a controller for generating isolation map information using the input signal and the interference cancellation signal and controlling the amplification signal corresponding to one of the input signal and the interference cancellation signal to be transmitted using the isolation map information An interference cancellation repeater is disclosed.

Here, the control unit may control the input amplification signal corresponding to the input signal to be transmitted if the isolation degree information is equal to or greater than a preset reference isolation degree.

The controller may adjust the signal gain using the isolation degree information when the isolation degree information exceeds the reference isolation degree, and the input amplified signal may be a signal amplified corresponding to the signal gain.

Also, the controller may control the interference elimination amplification signal corresponding to the interference elimination signal to be transmitted when the isolation degree information is less than a preset reference isolation degree.

In addition, the controller may control the interference elimination amplification signal to be transmitted when the predetermined data transmission amount is equal to or greater than a preset reference transmission amount.

Also, the controller may control the transmission of the input amplified signal corresponding to the input signal if the data transmission amount is less than the reference transmission amount.

Also, the controller may adjust the signal gain using the isolation degree information if the data transmission amount is less than the reference transmission amount, and the input amplified signal may be an amplified signal such that the input signal corresponds to the signal gain.

In addition, the controller may control the input amplified signal to be transmitted if the signal gain is equal to or greater than a predetermined minimum gain.

According to another embodiment of the present invention, there is provided a method of generating an interference cancellation signal, comprising: generating an interference cancellation signal by removing an interference signal included in a received input signal; Generating the isolation map information using the input signal and the interference cancellation signal; And transmitting the amplified signal corresponding to one of the input signal and the interference cancellation signal using the isolation degree information.

The step of transmitting the amplified signal may include transmitting the input amplified signal corresponding to the input signal if the isolation degree information is equal to or greater than a preset reference isolation degree.

The step of transmitting the input amplified signal may include: adjusting a signal gain using the isolation degree information when the isolation degree information exceeds the reference isolation degree; And amplifying the input signal to correspond to the signal gain to generate an input amplified signal.

The delay amount adjustment method may further include transmitting an interference cancellation amplification signal corresponding to the interference cancellation signal if the isolation degree information is less than a preset reference isolation degree.

The step of transmitting the interference cancellation amplification signal may include transmitting the interference cancellation amplification signal if the preset data transmission amount is equal to or greater than a preset reference transmission amount.

The delay amount adjusting method may further include transmitting an input amplified signal corresponding to the input signal if the data transmission amount is less than the reference transmission amount.

The step of transmitting the input amplified signal may include: adjusting a signal gain using the isolation degree information if the data transmission amount is less than the reference transmission amount; And amplifying the input signal to correspond to the signal gain to generate an input amplified signal.

The step of transmitting the input amplified signal may further include transmitting the input amplified signal when the signal gain is equal to or higher than a preset minimum gain.

According to another embodiment of the present invention, there is provided a computer-readable recording medium recording a program for causing a computer to execute a delay amount adjustment method in the above interference cancellation repeater.

The interference cancellation repeater and the delay amount adjustment method according to the present invention can control the amount of delay of a transmitted signal, so that the amount of data to be transmitted can be maintained.

1 is a block diagram of a mobile communication system according to an embodiment of the present invention;
2 is a block diagram of an interference canceller according to an embodiment of the present invention;
3 is a flowchart illustrating a method of adjusting a delay amount in an interference cancellation repeater according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 1, a mobile communication system 100 according to an embodiment of the present invention includes a base station 110, an interference cancellation repeater 120, and a mobile communication terminal 130.

The base station 110 connects the mobile communication network and the mobile communication terminal 130 for mobile communication services. That is, the signal transmitted from the mobile communication terminal 130 is transmitted to the receiver terminal (not shown) via the base station 110. In this case, when the distance between the base station 110 and the mobile communication terminal 130 is too long to smoothly transmit signals, the interference cancellation repeater 120 may perform a signal amplification function between the base station 110 and the mobile communication terminal 130 have. In this case, the interference canceller 120 according to an embodiment of the present invention may receive a signal (hereinafter referred to as an 'input signal') input from the base station 110, the mobile communication terminal 130 and / or other repeaters It is possible to determine whether or not to remove the interference. Since the interference cancellation repeater 120 further performs interference cancellation operation, the amount of data transmission per unit time may be smaller than that of a general repeater, so that the amount of delay of data transmission (i.e., (Hereinafter referred to as " delay amount ") does not become too large. Hereinafter, the operation of the interference cancellation repeater 120 according to an embodiment of the present invention will be described in detail with reference to FIG.

2 is a block diagram of an interference cancellation repeater according to an embodiment of the present invention.

2, an interference canceller 120 according to an exemplary embodiment of the present invention includes a controller 210, an interference eliminator 220, a first gain adjuster 230, a second gain adjuster 240, A switch unit 250, and a service antenna unit 260. Here, it is assumed that the switch 250 is set such that a signal output from the first gain controller 230 is output to the service antenna 260.

First, the input signal may be output to the controller 210, the interference eliminator 220, and / or the second gain controller 240. The interference eliminator 220 removes the interference signal included in the input signal to generate an interference cancellation signal. At this time, a reference signal (hereinafter, referred to as a reference signal) for removing an interference signal may be stored in a storage space provided in the interference eliminator 220 in advance, and the interference eliminator 220 may receive the reference signal The interference signal can be removed from the input signal. The method of eliminating the interference signal included in the input signal by the interference eliminator 220 may vary, and a detailed description thereof will be omitted since it is obvious to those skilled in the art. The interference eliminator 220 may output the generated interference cancellation signal to the controller 210 and / or the first gain adjuster 230.

The control unit 210 may generate the isolation map information according to a predetermined method using the input signal and the interference cancellation signal. Here, the isolation information may be information indicating how much isolation between the donor antenna unit (not shown) included in the interference canceller 120 and the service antenna unit 260 is performed. The greater the isolation level information, the greater the distance between the donor antenna unit (not shown) and the service antenna unit 260, and the signal transmitted from the service antenna unit 260 is re-input to the donor antenna unit This can mean low likelihood. Accordingly, the control unit 210 can generate the isolation degree information according to the following equation.

Isolation degree information = first signal gain + (interference cancellation signal level - input signal level)

Here, the first signal gain may be a predetermined value as information indicating how much the input signal to be output is amplified. The interference cancellation signal level may be a voltage level of the interference cancellation signal, and the input signal level may be a voltage level of the input signal. Therefore, the isolation degree information may be a value obtained by subtracting the interference signal level (i.e., the voltage level of the interference signal) at the first signal gain.

The controller 210 compares the generated isolation degree information with a preset reference isolation level to determine whether to amplify and output the interference cancellation signal or to amplify and output the input signal. If the isolation level is sufficiently secured, the quality of the mobile communication service is not degraded without removing the interference signal from the input signal.

When the isolation degree information is equal to or higher than the reference isolation degree, the controller 210 may adjust the first signal gain using the isolation degree information, and then output the adjusted first signal gain to the first gain adjustment unit 230. At this time, the controller 210 may adjust the first signal gain higher than a predetermined value. This is because when the isolation information is higher than the reference isolation degree, the quality of the mobile communication service is not affected even if the interference signal is rarely included or included.

The first gain adjuster 230 may amplify the input signal using the first signal gain input from the controller 210. That is, the first gain control unit 230 is connected to an amplification unit (not shown) so that an amplification unit (not shown) amplifies the input signal according to the first signal gain, And a signal amplified and generated according to the gain). The generated input amplified signal can be transmitted to the outside through the service antenna unit 260.

On the other hand, when the isolation degree information is less than the reference isolation degree, the control unit 210 may compare the predetermined data transmission amount (Throughput) with a predetermined reference transmission amount to determine whether to output the interference cancellation signal. Here, the data transmission amount may be information received from an external device (e.g., an administrator terminal, a server, etc.). That is, the external apparatus can check the amount of data received from the interference cancellation repeater 120 per unit time to generate a data transmission amount, and transmit the generated data transmission amount to the interference cancellation repeater 120. Accordingly, the control unit 210 can compare the data transmission amount received from the external apparatus with a preset reference transmission amount.

If the comparison result indicates that the data transmission amount is greater than the reference transmission amount, the control unit 210 can control the indirect removal signal to be amplified according to the predetermined second signal gain. For example, the controller 210 may output the previously stored second signal gain to the second gain controller 240. The second gain adjuster 240 may be configured to amplify the interference cancellation signal using the second signal gain input from the controller 210. That is, the second gain adjuster 240 is connected to an amplifier (not shown) to amplify the interference cancellation signal according to the second signal gain, so that the interference cancellation amplification signal And a signal amplified and generated according to the second signal gain). The generated interference canceled amplified signal can be transmitted to the outside via the service antenna unit 260.

If the data transmission amount is equal to or greater than the reference transmission amount, the control unit 210 may generate a switching signal and output the switching signal to the switch unit 250. Therefore, the switch unit 250 can be switched so that the signal output from the second gain adjuster 240 is output to the service antenna unit 260, whereby the second gain adjuster 240 adjusts the second signal gain So that the interference cancellation signal can be amplified. For example, it is assumed that the switch unit 250 is configured such that any one of the first gain adjuster 230 and the second gain adjuster 240 is connected to the amplifier unit (not shown). In this case, the switch unit 250 can couple the second gain control unit 240 and the amplification unit (not shown) by a switching signal, and the amplification unit (not shown) The second signal gain may be used to amplify the interference cancellation signal.

On the other hand, if the data transmission amount is less than the reference transmission amount, the control unit 210 can determine whether to output the input amplification signal by adjusting the first signal gain. If the data transmission amount is less than the reference transmission amount, the mobile communication service may not be performed smoothly. Therefore, the control unit 210 may lower the voltage level of the output signal rather than transmit the interference cancellation signal so as to maintain smooth mobile communication service Can be determined. For this, the controller 210 may adjust the first signal gain using the isolation diagram information. At this time, the controller 210 can adjust the first signal gain to be lower than a predetermined value. If the isolation level information is less than the standard isolation level, the first signal gain is lowered to prevent oscillation because the interference signal is included.

In this case, the control unit 210 can control the input amplified signal to be generated and transmitted only when the first signal gain is lower than the predetermined minimum gain. If the first signal gain is less than the preset minimum gain, So that the signal can be controlled to be transmitted. If the voltage level of the input amplified signal is too low, the coverage of the interference cancellation repeater 120 becomes too small to function as an amplifier.

As described above, the interference canceller 120 according to an exemplary embodiment of the present invention amplifies and transmits an input signal without interference elimination if the isolation is good, and transmits the amplified signal through the interference cancellation only when the isolation is poor. It is possible to control the 'amount of delay of the transmission signal' generated when the interference is removed. In addition, the interference canceller 120 according to an embodiment of the present invention does not remove unconditional interference even when the isolation degree is poor, but only when the data transmission is smooth and / or the minimum signal gain can not be secured. It is possible to always provide a smooth mobile communication service by maintaining the 'delay amount of the transmission signal' to a minimum.

3 is a flowchart illustrating a method of adjusting a delay amount in an interference cancellation repeater according to another embodiment of the present invention.

Hereinafter, a method of adjusting the amount of delay in the interference canceller according to another embodiment of the present invention will be described with reference to FIG. Each of the steps to be described below may be performed by the respective elements included in the interference cancellation repeater 120 described with reference to FIG. 2. However, for convenience of explanation and explanation, the interference cancellation repeater 120 performs Will be collectively referred to. Therefore, the subject performing the following steps may be omitted.

In step S310, when the input signal is received, the interference elimination signal is generated by removing the interference signal included in the input signal (step S320). At this time, a reference signal (hereinafter, referred to as a reference signal) for removing an interference signal may be stored in a storage space in advance, and the interference cancellation repeater 120 may use an interference signal Can be removed.

In step S330, isolation degree information is generated according to a predetermined method using an input signal and an interference cancellation signal. The greater the isolation level information, the greater the distance between the donor antenna unit (not shown) and the service antenna unit 260, and the signal transmitted from the service antenna unit 260 is re-input to the donor antenna unit This can mean low likelihood. Therefore, the interference cancellation relay 120 can generate the isolation degree information according to the following equation.

Isolation degree information = first signal gain + (interference cancellation signal level - input signal level)

In step S340, the generated isolation degree information is compared with a predetermined reference isolation degree to determine whether to amplify and output the interference cancellation signal or to amplify and output the input signal. If the isolation level is sufficiently secured, the quality of the mobile communication service is not degraded without removing the interference signal from the input signal.

In step S350, if the isolation degree information is equal to or greater than the reference isolation degree, the first signal gain can be adjusted using the isolation degree information. At this time, the interference cancellation repeater 120 can adjust the first signal gain higher than a predetermined value. This is because when the isolation information is higher than the reference isolation degree, the quality of the mobile communication service is not affected even if the interference signal is rarely included or included.

In step S360, when the isolation degree information is less than the reference isolation degree, a preset data transmission amount (Throughput) is compared with a predetermined reference transmission amount to determine whether to output the interference cancellation signal. If the data transmission amount is less than the reference transmission amount, the interference cancellation repeater 120 may determine whether to output the input amplification signal through adjustment of the first signal gain (step S350). If the data transmission amount is less than the reference transmission amount, the mobile communication service may not be smoothly performed. Therefore, the interference cancellation repeater 120 maintains the smooth mobile communication service by lowering the voltage level of the signal outputting rather than transmitting the interference cancellation signal It can be judged whether or not it is good. To this end, the interference cancellation repeater 120 may adjust the first signal gain using the isolation degree information. At this time, the interference cancellation repeater 120 can adjust the first signal gain lower than a predetermined value. If the isolation level information is less than the standard isolation level, the first signal gain is lowered to prevent oscillation because the interference signal is included.

In step S370, it is determined whether or not the first signal gain is equal to or greater than a predetermined minimum gain. If the voltage level of the input amplified signal is too low, the coverage of the interference cancellation repeater 120 becomes too small to function as an amplifier.

In step S380, the input signal is amplified using the first signal gain to generate an input amplified signal, and the generated input amplified signal is transmitted to the outside. That is, the interference cancellation amplifier 120 can transmit the input amplified signal to the outside when the isolation degree information is equal to or greater than the reference isolation degree, or when the data transmission amount is less than the reference transmission amount and the first signal gain is the minimum gain or more.

In step S390, if the comparison result data transmission amount in step S360 is equal to or greater than the reference transmission amount, the indirect elimination signal is amplified according to the predetermined second signal gain to generate the indirect elimination amplification signal, and the indirect elimination amplification signal is transmitted to the outside. At this time, the interference canceller 120 may enable the interference cancellation signal to be amplified using the previously stored second signal gain.

As described above, the delay amount adjustment method in the interference cancellation repeater according to another embodiment of the present invention amplifies and transmits an input signal without interference cancellation if the isolation is good, The amount of delay of the transmission signal generated during interference cancellation can be adjusted. The method of adjusting the amount of delay in the interference canceller according to another embodiment of the present invention is not limited to removing the unconditional interference even when the isolation degree is not good, and when the data transmission is smooth and / or the minimum signal gain can not be secured The amount of delay of the transmission signal is kept to a minimum so that a smooth mobile communication service can be always provided.

The delay amount adjustment method in the interference cancellation repeater according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data that can be decoded by a computer system. For example, it may be a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, or the like. In addition, the computer-readable recording medium may be distributed and executed in a computer system connected to a computer network, and may be stored and executed as a code readable in a distributed manner.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that various modifications and changes may be made.

100: mobile communication system
110: base station
120: interference cancellation repeater
130: mobile communication terminal
210:
220: Interference elimination
230: first gain control unit
240: second gain control unit
250:
260:

Claims (17)

delete delete delete delete An interference canceller for removing an interference signal included in a received input signal to generate an interference cancellation signal; And
Generates an isolation degree information by using the input signal and the interference cancellation signal, controls the input amplification signal corresponding to the input signal to be transmitted if the isolation degree information is equal to or higher than a preset reference isolation degree, If the degree of isolation is less than the degree of isolation, the interference canceling amplification signal corresponding to the interference cancellation signal is transmitted;
, ≪ / RTI &
Wherein the control section controls the interference elimination amplification signal to be transmitted when the isolation degree information is less than a preset reference isolation degree and the predetermined data transmission amount is equal to or greater than a predetermined reference transmission amount.
6. The method of claim 5,
Wherein the control unit controls the input amplification signal corresponding to the input signal to be transmitted if the data transmission amount is less than the reference transmission amount.
The method according to claim 6,
Wherein the control unit controls the signal gain using the isolation degree information if the data transmission amount is less than the reference transmission amount,
Wherein the input amplified signal is an amplified signal such that an input signal corresponds to the signal gain.
8. The method of claim 7,
Wherein the control unit controls the input amplified signal to be transmitted when the signal gain is equal to or higher than a preset minimum gain.
delete delete delete delete Generating an interference cancellation signal by removing an interference signal included in the received input signal;
Generating the isolation map information using the input signal and the interference cancellation signal;
Transmitting an input amplification signal corresponding to the input signal if the isolation degree information is equal to or greater than a preset reference isolation degree; And
Transmitting an interference cancellation amplification signal corresponding to the interference cancellation signal if the isolation degree information is less than a preset reference isolation degree;
, ≪ / RTI &
Wherein the step of transmitting the interference cancellation amplification signal comprises:
Transmitting the interference cancellation amplification signal if the preset data transmission amount is equal to or greater than a preset reference transmission amount;
Wherein the delay amount adjusting unit adjusts the delay amount in the interference eliminating repeater.
14. The method of claim 13,
Transmitting an input amplified signal corresponding to the input signal if the data transmission amount is less than the reference transmission amount;
Further comprising the steps of: determining a delay amount in the interference canceling repeater;
15. The method of claim 14,
Wherein the step of transmitting the input amplified signal comprises:
Adjusting the signal gain using the isolation degree information if the data transmission amount is less than the reference transmission amount; And
Amplifying the input signal to correspond to the signal gain to generate an input amplified signal;
Wherein the delay amount adjusting unit adjusts the delay amount in the interference eliminating repeater.
16. The method of claim 15,
Wherein the step of transmitting the input amplified signal comprises:
Transmitting the input amplified signal if the signal gain is equal to or greater than a predetermined minimum gain;
Further comprising the steps of: determining a delay amount in the interference canceling repeater;
A computer-readable recording medium having recorded thereon a program for causing a computer to execute a delay amount adjustment method in an interference cancellation repeater as set forth in any one of claims 13 to 16.
KR1020140185011A 2014-12-19 2014-12-19 Interference cancellation repeater for adjusting signal delay amount and method for adjusting signal delay amount KR101847570B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100954139B1 (en) * 2009-10-07 2010-04-20 주식회사 이알에이와이어리스 System and method for cancelling interference signal using digital signal processing

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JP5273804B2 (en) 2009-07-13 2013-08-28 株式会社ジャパンディスプレイ Display device
US8965496B2 (en) 2010-09-27 2015-02-24 Steven J. Bailin Method for determining the location of regions in tissue relevant to electrical propagation

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Publication number Priority date Publication date Assignee Title
KR100954139B1 (en) * 2009-10-07 2010-04-20 주식회사 이알에이와이어리스 System and method for cancelling interference signal using digital signal processing

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