KR102120673B1 - Distributed antenna system and improving signal quality method thereof - Google Patents

Abstract

A method for improving signal quality of a distributed antenna system according to an embodiment of the present invention includes: receiving a first target signal output by a remote unit; Comparing the first target signal and a reference signal, and calculating a first difference value between the first target signal and the reference signal; And adjusting a frequency characteristic of a target path, which is a path on a distributed antenna system for outputting the first target signal, based on the first difference value. It may include.

Description

DISTRIBUTED ANTENNA SYSTEM AND IMPROVING SIGNAL QUALITY METHOD THEREOF}

The technical idea of the present invention relates to a distributed antenna system and a method for improving signal quality of a distributed antenna system.

Distributed antenna system (Distributed Antenna System) is an antenna system used to solve a problem of high traffic capacity in an indoor environment or a predetermined area by spatially dispersing a plurality of antennas.

Distributed antenna systems are installed in buildings, tunnels, subways, etc. to provide communication services even in areas where base transceiver signals are difficult to reach, and are smooth even in places with high demand for stadiums, large facilities, and services. Used for service provision.

As described above, the distributed antenna system is a system for compensating for limited output and coverage of a base station, and is widely used to solve a service shadow area.

Distributed antenna systems require various connection materials, such as connectors and jumper cords, to connect multiple units with cables.

When a distributed antenna system is operated for a long time, loss may increase gradually due to dust or incomplete attachment and detachment of the connector portion, improper curvature radius of the jumper cord, and stress of the cable.

As a result, the signal output of the repeater decreases from the initially set value, or on the contrary, the problem occurs that the signal output of the distributed antenna system becomes larger than the initially set value due to defects in the distributed antenna system itself or various other causes.

Prior arts related to this include International Patent Publication No. WO2017/175937A1 (published on October 12, 2017).

The distributed antenna system and the method for improving the signal quality of the distributed antenna system according to the technical idea of the present invention have an object to improve the quality of a service signal.

In addition, the present invention has an object to operate a distributed antenna system, to check the distributed antenna system and to improve the quality of service signals.

The present invention aims to improve the quality of service signals through various methods.

A method for improving signal quality of a distributed antenna system according to an aspect of the present invention includes: receiving a first target signal output by a remote unit; Comparing the first target signal and a reference signal, and calculating a first difference value between the first target signal and the reference signal; And adjusting a frequency characteristic of a target path, which is a path on a distributed antenna system for outputting the first target signal, based on the first difference value. It may include.

According to an exemplary embodiment, the reference signal is a base station signal transmitted by a base station connected to the distributed antenna system, and in the first target signal, the base station signal is transmitted to the remote unit through the target path and output. It can be a signal.

According to an exemplary embodiment, generating a test signal that is the reference signal for measuring the state of the target path; Further comprising, the step of receiving the first target signal includes the step of receiving the first target signal, which is a signal that is generated and transmitted to the remote unit through the target test signal is generated, the output signal, The calculating of the first difference value may include comparing the first target signal and the generated test signal, and calculating the first difference value between the first target signal and the test signal. .

According to an exemplary embodiment, the remote unit includes a plurality of antennas, and receiving a second target signal of the target path in which the frequency characteristic is adjusted from the remote unit; Calculating a second difference value by comparing the second target signal and the reference signal; And changing a signal allocation order associated with an antenna to be output among a plurality of antennas of the remote unit based on the second difference value. It may further include.

According to an exemplary embodiment, the step of changing the signal allocation order may include determining the importance of a plurality of base station signals transmitted by a plurality of base stations connected to the distributed antenna system, and the second difference value and the determined importance level. It may include the step of changing the signal allocation order based on.

According to an exemplary embodiment, the remote unit includes a plurality of antennas, and receiving a second target signal of the target path, the frequency characteristic of which is adjusted, from the remote unit; Calculating a second difference value by comparing the second target signal and the reference signal; And changing at least some paths of the target path based on the second difference value. It may further include.

A sub-system included in a distributed antenna system according to another aspect of the inventive concept receives a first target signal output by a remote unit, compares the first target signal with a reference signal, and the first target An analysis module for calculating a first difference value between a signal and the reference signal; And an equalizer that adjusts a frequency characteristic of a target path that is a path on a distributed antenna system for outputting the first target signal based on the first difference value.

According to an exemplary embodiment, the reference signal is a base station signal transmitted by a base station connected to the distributed antenna system, and in the first target signal, the base station signal is transmitted to the remote unit through the target path and output. It can be a signal.

According to an exemplary embodiment, a signal generating module for generating a test signal that is the reference signal for measuring the state of the target path; Further comprising, the analysis module, the generated test signal is transmitted to the remote unit through the target path receives the first target signal that is a signal output, the first target signal and the generated test By comparing signals, the first difference value between the first target signal and the test signal may be calculated.

According to an exemplary embodiment, a transceiver module for changing a signal allocation order associated with an antenna to be output among a plurality of antennas of the remote unit based on a second difference value; Further comprising, the remote unit includes a plurality of antennas, and the analysis module receives the second target signal of the target path in which the frequency characteristic is adjusted from the remote unit, and the second target signal and the The second difference value may be calculated by comparing the reference signal.

According to an exemplary embodiment, the transceiver module determines the importance of a plurality of service input signals transmitted by a plurality of base stations connected to the distributed antenna system, and allocates the signal based on the second difference value and the determined importance. You can change the order.

According to an exemplary embodiment, a switch module for changing at least a part of the target route based on a second difference value; Further comprising, the remote unit includes a plurality of antennas, and the analysis module receives the second target signal of the target path in which the frequency characteristic is adjusted from the remote unit, and the second target signal and the The second difference value may be calculated by comparing the reference signal.

The distributed antenna system and the method for improving the signal quality of the distributed antenna system according to the technical idea of the present invention can improve the quality of service signals.

In addition, the present invention can operate a distributed antenna system, check the distributed antenna system and improve the quality of service signals.

In addition, the present invention can provide various methods for improving service signal quality.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.
1 is a conceptual diagram for a distributed antenna system according to an embodiment of the present invention.
2 is a block diagram of the configuration of a main unit according to various embodiments of the present invention.
3 is a block diagram of the configuration of a transceiver module according to various embodiments of the present invention.
4 is a block diagram showing the configuration of a hub unit according to various embodiments of the present invention.
5 is a block diagram showing the configuration of a remote unit according to various embodiments of the present invention.
6 is an exemplary view for explaining a method for adjusting frequency characteristics of a distributed antenna system according to various embodiments of the present invention.
7 is an exemplary diagram of a method for adjusting frequency characteristics using a base station signal of a distributed antenna system according to various embodiments of the present invention.
8 is an exemplary diagram of a method for adjusting frequency characteristics using a test signal generated inside a distributed antenna system according to various embodiments of the present invention.
9 is an exemplary view of a method of changing and changing a signal allocation order of a distributed antenna system according to various embodiments of the present invention.
10 is an exemplary view of a method of switching using a switch of a distributed antenna system according to various embodiments of the present invention.
11 is a flowchart of a method for improving signal quality when a reference signal is a base station signal according to various embodiments of the present invention.
12 is a flowchart illustrating a method for improving signal quality when a reference signal is a test signal according to various embodiments of the present invention.

The technical idea of the present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the technical spirit of the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the scope of the technical spirit of the present invention.

In describing the technical spirit of the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the numbers (for example, first, second, etc.) used in the description process of the present specification are only identification symbols for distinguishing one component from other components.

In addition, in this specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected to the other component, or may be directly connected, but in particular It should be understood that, as long as there is no objection to the contrary, it may or may be connected via another component in the middle.

In addition, terms such as "~ unit", "~ group", "~ ruler", and "~ module" described in the present specification mean a unit that processes at least one function or operation, which is a processor or microprocessor. Processor (Micro Processer), Micro Controller (Micro Controller), CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) or the like, or a combination of hardware and software or software.

In addition, it is intended to clarify that the division of the constituent parts in this specification is only classified according to main functions of each constituent part. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more for each subdivided function. In addition, each of the components described below may additionally perform some or all of the functions of other components in addition to the main functions in charge of the components, and some of the main functions of each component are different. Needless to say, it may also be carried out in a dedicated manner.

Hereinafter, embodiments according to the technical spirit of the present invention will be described in detail.

1 is a conceptual diagram for a distributed antenna system according to an embodiment of the present invention.

Referring to FIG. 1, the distributed antenna system 10 may include a point of interest (POI) 30, a main unit 100, a hub unit 200, and a remote unit 300. Here, the POI 30 and the main unit 100 may be referred to as a head end, and the main unit 100 may also be referred to as a head end.

The POI 30 may be connected to each of the plurality of base stations 1a to 1n, and may receive a base station signal (BTS signal) corresponding to the downlink from the plurality of connected base stations 10a to 10n. In addition, the POI 30 may transmit the processed base station signal to the main unit 100.

The POI 30 may perform signal processing so that the base station signals transmitted from the base stations (BTS, 1a to 1n) can be processed by the distributed antenna system 10, and the terminal signals received and processed by the distributed antenna system 10 may be processed. The signal can be processed so that it can be transmitted to the base stations 1a to 1n.

For example, the POI 30 can attenuate a high power level base station signal and convert it to an appropriate level for the distributed antenna system 10, and downlink and uplink the base station signals transmitted from the base stations 1a to 1n. Can be separated by. In addition, the POI 30 may attenuate terminal signals processed by the distributed antenna system 10 to be suitable for the base stations 1a to 1n.

Here, the POI 30 may be referred to as a signal matching device.

The main unit 100 may be connected to the POI 30, the hub unit 200, and a plurality of remote units 300 through a communication medium. Here, the communication medium may include an optical fiber, a coaxial cable, or the like.

The main unit 100 may transmit the received base station signal to the hub unit 200 and the remote unit 300.

For example, the main unit 100 may convert the RF signal into a digital signal, and distribute the converted digital signal to the hub unit 200 and the remote unit 300.

Specifically, the main unit 100 may distribute the converted digital signal to transmit the received RF signal to the remote unit 300 corresponding to the region to be output.

The main unit 100 may be connected to other main units, and may transmit or receive base station signals or terminal signals with other connected main units. Here, the base station signal may mean a downlink signal, and the terminal signal may mean an uplink signal.

The main unit 100 may distribute or redistribute capacity for communication services.

Also, the main unit 100 may perform signal conversion between a frequency division duplex scheme and a time division duplex scheme. For example, the main unit 100 may convert an FDD carrier into a TDD carrier, and convert a TDD carrier into an FDD carrier. Here, the carrier may include data according to the service signal, and may also mean a service signal.

The main unit 100 may perform analysis to adjust the frequency characteristic of the target path through which the received base station signal passes to transmit it to the terminal. Here, the frequency characteristic refers to a change in frequency such as voltage and current at the input or output of a circuit or device. For example, the frequency characteristic may mean a change in frequency of an output signal from which a corresponding signal is output through a distributed antenna system, compared to a signal input through a distributed antenna system.

Here, the target path may mean a path for outputting a signal input to the distributed antenna system, and the target path may include an antenna outputting a signal. Accordingly, the target path may mean various paths in the distributed antenna system through which signals for output from the distributed antenna system pass. For example, a path through which a base station signal received from a base station connected to a distributed antenna system is output from the distributed antenna system may be referred to as a target path. For another example, a path taken to output a test signal generated by a distributed antenna system may be referred to as a target path.

In addition, the main unit 100 can receive a plurality of base station signals from a plurality of base stations (1a ~ 1n), can allocate a plurality of received base station signals according to the signal allocation order, change the signal allocation order It might be. Here, the signal allocation order is related to the output antenna of the remote unit 300. For example, the first base station signal, the second base station signal and the third base station signal are received from three base stations 1a, 1b and 1c, and the signal allocation order is the first base station 1a and the second base station 1b. , If the third base station (1c) is set, the first antenna (not shown) of the remote unit 300 outputs the first base station signal, the second antenna (not shown) of the remote unit 300 is 2 outputs a base station signal, and a third antenna (not shown) of the remote unit 300 may output a third base station signal.

The main unit 100 may also be referred to as a Distribution & Aggregation Unit (DAU).

Hereinafter, for convenience of description, the main unit 100 will be described as performing content analysis for adjusting the frequency characteristic of the target path through which the received base station signal is transmitted to the terminal, but is not limited thereto. It is natural that at least one of the main unit 100, the hub unit 200, and the remote unit 300 can perform analysis to adjust frequency characteristics.

In addition, hereinafter, for convenience of description, the main unit 100 is expressed as changing the signal allocation order, but is not limited thereto, and the main unit 100, the hub unit 200, or the remote unit 300 It is natural that at least one configuration may change the signal allocation order.

The configuration of the main unit will be described in detail with reference to FIG. 2.

2 is a block diagram of the configuration of the main unit 100 according to various embodiments of the present invention.

Referring to FIG. 2, the main unit 100 includes an RF module 110, a baseband module 120, a backplane 150, a channel scanner 180, a power supply module 190, and a transceiver module 170 can do. In addition, the main unit 100 may include a channel scanner 180, which will be described later, or may be connected to a channel scanner 180 that is an external device.

The RF module 110 may include a plurality of RF modules 111-119.

In an embodiment, each of the plurality of RF modules 111 to 119 may receive and transmit RF signals of different bands.

In another embodiment, each of the plurality of RF modules 111 to 119 may be connected to a different base station to receive a downlink signal and transmit an uplink signal.

The RF module 110 can attenuate the downlink signal and convert the downlink signal into a digital signal. For example, the RF module 110 may attenuate the downlink RF signal and convert it into a digital signal.

The RF module 110 may convert and amplify the uplink signal into an RF signal. For example, the RF module 110 may convert and amplify a digital signal that is an uplink signal into an RF signal.

The RF module 110 may include an analog to digital converter (ADC) and a digital to analog converter (DAC) for conversion between an analog signal and a digital signal.

The baseband module 120 may include a digital signal interface and receive a digital signal.

Specifically, the baseband module 120 may interface to receive a digital signal of a standard such as Common Public Radio Interface (CPRI), Open Baseband Remote Radiohead Interface (OBSAI).

For example, the baseband module 120 may interface with C-RAN (Centralized Radio Access Networks, Cloud-RAN), RAX (Radio Access eXchange), integrated BTS (All-in-one BTS), and the like.

The backplane 150 may be connected to the POI 30, the RF module 110, the baseband module 120, the transceiver module 170, and the power supply module 190. For example, the backplane 150 may include at least one type of interface module that can be connected to the above-described components. Thus, the backplane 150 may form a data bus structure in the main unit 100.

The backplane 150 can distribute signals and power, and can perform high speed signal routing. In addition, the backplane 150 may provide power and input/output signals (I/O signals) to the POI 30.

The backplane 150 may also be referred to as a mainboard.

The main unit 100 may include a channel scanner 180 or may be connected to a channel scanner 180 that is an external device to obtain various information from the channel scanner 180.

The channel scanner 180 may also be referred to as a decode device or a decode subrack.

The channel scanner 180 includes a channel frequency, a bandwidth, a mobile network code (MNC), a mobile country code (MCC), a channel power, a pilot power, and a received signal. Information related to a reference signal received power (RSRP), cell ID (cell ID), and single input single output (SISO)/multiple input multiple output (MIMO) may be determined. In addition, the channel scanner 180 may transmit the determined information to at least one configuration included in the main unit 100.

Further, the channel scanner 180 may perform spectrum analysis of the received signal.

The power supply module 190 may convert input and output power. For example, the power supply module 190 may convert input and output power from AC (Alternating Current) to DC (Direct Current) or DC to AC.

The transceiver module 170 may be connected to the hub unit 200 and the remote unit 300.

The transceiver module 170 may interface between the RF module 110, the baseband unit 120 and the hub unit 200, and the remote unit 300.

Also, the transceiver module 170 may support expansion for interfacing with other main units. Accordingly, through the transceiver module 170, the main unit 100 may be connected to other main units.

The transceiver module 170 may aggregate signals received from the RF module 110 and the baseband unit 120 and distribute the signals to the hub unit 200 and the remote unit 300. For example, the transceiver module 170 may distribute the aggregated signal through the optical port to the hub unit 200 and the remote unit 300.

The transceiver module 170 may perform noise rejection filtering and rate conversion.

The transceiver module 170 may perform band allocation according to signal transmission and may perform sectorization. In addition, the transceiver module 170 may perform SISO/MIMO signal routing.

The transceiver module 170 may control and monitor system status.

The transceiver module 170 may receive a plurality of base station signals from a plurality of base stations 1a to 1n, and may allocate a plurality of received base station signals according to a signal allocation order. In addition, the transceiver module 170 may change the signal allocation order.

The transceiver module 170 may determine the importance of base station signals received from a plurality of base stations 1a to 1n.

The transceiver module 170 may receive the base station signal that has passed through the target path from the remote unit and compare the received signal with the base station signal received from the base station to calculate a difference value. Then, the transceiver module 170 may adjust the frequency characteristic of the target path based on the calculated difference value. For example, the transceiver module 170 may compare the frequency characteristic of the received target signal with the frequency characteristic of the reference signal, and calculate a difference value for a difference between the frequency characteristic of the target signal and the frequency characteristic of the reference signal.

In addition, the transceiver module 170 may generate a test signal, receive a test signal that has passed through a target path from a remote unit, and compare the received signal with the generated test signal to calculate a difference value. Then, the transceiver module 170 may adjust the frequency characteristic of the target path based on the calculated difference value.

The configuration of the transceiver module 170 will be described with reference to FIG. 3.

The description of the configuration of the main unit 100 described above is an example of description, and other configurations may be further included in addition to the configurations described above, and some of the configurations described above may not be included.

In addition, the main unit 100 may include at least one processor and memory, and execution forms stored in the memory may be configured to be executed by the processor.

3 is a block diagram of the configuration of a transceiver module according to various embodiments of the present invention.

Referring to FIG. 3, the transceiver module 170 may include an FPGA 171, a CPU 173, a spectrum analysis module 175, an analysis module (000), and a signal generation module (000).

The field programmable gate array (FPGA) 171 and the central processing unit (CPU) 173 may perform the functions of the above-described transceiver module 170.

The spectrum analysis module 175 may display and analyze the spectrum.

The spectrum analysis module 175 may display a spectrum waveform. For example, the spectrum analysis module 175 may include ACLC (Adjacent Channel Leakage Power Ratio), channel power, OBW, and spectrum emission mask. ) And can be analyzed.

The spectrum analysis module 175 may detect various information through analysis. For example, the spectrum analysis module 175 may detect a protocol, a carrier, a region, a band, MIMO, a sector, and the like.

In addition, the spectrum analysis module 175 may measure Error Vector Magnitude (EVM).

The signal generation module 177 may generate a test signal for measuring the state of the target path. For example, a CW (Continuous Wave) signal can be generated.

The analysis module 179 may receive the target signal passing through the target path from the remote unit. In addition, the analysis module 179 may calculate a difference value by comparing the received target signal with a reference signal. For example, the analysis module 179 may compare the frequency characteristic of the received target signal and the frequency characteristic of the reference signal, and calculate a difference value for a difference between the frequency characteristic of the target signal and the frequency characteristic of the reference signal.

In one embodiment, the analysis module 179 may receive a base station signal that has passed the target path from a remote unit, and compare the signal with a base station signal received from the base station to calculate a difference value.

In another embodiment, the analysis module 179 may receive the test signal that has passed through the received target path from the remote unit, and compare the generated test signal with the generated test signal to calculate a difference value.

See again FIG. 1.

Referring to FIG. 1, the hub unit 200 may be connected to the main unit 100 and the remote unit 300. For example, the hub unit 200 may be connected to the main unit 100 and a plurality of remote units 300 through an optical fiber.

The hub unit 200 may be connected between the main unit 100 and the remote unit 300 to expand the connection capacity of the remote unit 300 of the main unit 100. For example, the hub unit 200 may be connected to the main unit 100, and may be connected to the first to third remote units 300a to 300c. Accordingly, the main unit 100 may be directly connected to the fourth to nth remote units 300d to 300n, and may be connected to the first to third remote units 300a to 300c through the hub unit 200. have.

In another embodiment, the distribution antenna system 10 may be configured as a topology in which the remote unit 300 is connected to the main unit 100 through the hub unit 200.

The hub unit 200 may transmit a signal between the connected main unit 100 and the remote unit 300.

For example, the hub unit 200 may convert a digital signal transmitted from the main unit 100 to an Ethernet format and transmit data converted to an Ethernet format to the remote unit 300.

The hub unit 200 may supply power to the remote unit 300. For example, the hub unit 200 may supply power to the connected remote unit 300 through Power of Ethernet (PoE).

The hub unit 200 may monitor the current for each of the plurality of connected remote units 300, and automatically cut off power according to the monitoring.

The structure of the hub unit will be described with reference to FIG. 4.

4 is a block diagram showing the configuration of a hub unit according to various embodiments of the present invention.

Referring to FIG. 4, the hub unit 200 may include a transceiver module 270 and a power supply module 290.

The transceiver module 270 may include a port for interfacing with the main unit 100, and may include a port for interfacing with other hub units in a daisy chain form.

The transceiver module 270 may control and monitor the system status.

In addition, the transceiver module 270 may perform the functions of the hub unit 200 described above.

The power supply module 290 may supply power to a configuration included in the hub unit 200 and may supply power to the connected remote unit 300.

See again FIG. 1.

The remote unit 300 may be connected to the main unit 100, and may be connected to the main unit 100 through the hub unit 200.

The remote unit 300 may output a signal transmitted from the main unit 100 through an antenna, and may transmit a terminal signal received through the antenna to the main unit 100.

The remote unit 300 may be divided into high power and low power according to the output. A remote unit having low output power may be referred to as a low power radio node, and a remote unit having output power high may be referred to as a high power radio node.

The remote unit 300 may include an integrated antenna, and may be connected to an external antenna through an external antenna port.

In addition, the remote unit 300 may include or be connected to a plurality of directional antennas, and transmit signals to a specific area or a specific sector, and receive signals from a specific area or a specific sector. For example, the remote unit 300 may include at least one sector antenna or be connected to the sector antenna. Also, the remote unit 300 may include or be connected to an omnidirectional antenna and a directional antenna.

The remote unit 300 may selectively operate only some of the built-in antenna and the external antenna.

The remote unit 300 may transmit the target signal passing through the target path to the main unit 100.

The remote unit 300 may receive an analysis result for adjusting the frequency characteristic of the target path performed by the main unit 100 and adjust the frequency characteristic accordingly.

The remote unit 300 may receive an analysis result for adjusting the frequency characteristics of the target path performed by the main unit 100 and correspondingly change at least some paths of the target path.

Hereinafter, for convenience of description, the remote unit 300 is expressed as including an equalizer for adjusting frequency characteristics, but is not limited thereto, and the main unit 100, the hub unit 200, or the remote unit 300 It is natural that at least one of the configurations may include an equalizer.

In addition, hereinafter, for convenience of description, the remote unit 300 is expressed as having a switch module for changing at least a part of the target path, but is not limited thereto, and the main unit 100, the hub unit ( It is natural that at least one of the 200 or the remote unit 300 may include a switch module.

The configuration of the remote unit 300 will be described with reference to FIG. 5.

5 is a block diagram showing the configuration of a remote unit according to various embodiments of the present invention.

Referring to FIG. 5, the remote unit 300 may include a transceiver module 370, an RF module 380, an equalizer 330 and a switch module 340.

The transceiver module 370, the RF module 380, the equalizer 330, and the switch module 340 may perform the functions of the above-described remote unit 300.

The transceiver module 370 may perform sectorization and MIMO signal routing.

The transceiver module 370 may convert a digital signal into a downlink RF signal, and convert an uplink RF signal into a digital signal. In addition, the transceiver module 370 may apply digital filtering when converting an uplink RF signal to a digital signal.

The transceiver module 370 may perform system state control and monitoring.

The transceiver module 370 may support remote access through a WiFi connection.

The RF module 380 may include a built-in antenna, and may include a duplexer filter and/or a band pass filter (BPF) filter.

The RF module 380 can amplify and filter the downlink RF signal.

The RF module 380 can filter and amplify the uplink RF signal.

The RF module 380 may select connection and use between an internal antenna and an external antenna port. In addition, the RF module 380 may include a mechanical connector for selection between an internal antenna and an external antenna port.

The built-in antenna embedded in the RF module 380 may be included in various combinations.

The equalizer 330 can adjust the frequency characteristics of the target path. For example, the equalizer 330 may adjust the frequency amplification degree and/or phase of the target path.

The switch module 340 may switch at least some paths of the target path. For example, the switch module 340 may be included in the RF module 380 to switch the target path so that the antenna through which the signal is output is changed. For another example, the switch module 340 may be located in the middle of the target path to switch some of the target paths.

See again FIG. 1.

A network management system (NMS) 50 may manage a network including the distributed antenna system 10. For example, the NMS 50 may monitor and control the components included in the distributed antenna system 10, for example, the status and operation of one node.

The above description of the distributed antenna system 10 is an example for explanation, and may be variously configured according to a designer's or user's selection. Therefore, it may be implemented as an analog processing configuration in addition to the above-described digital processing configuration, or may be implemented by mixing the digital processing configuration and the analog processing configuration.

Based on the configuration and description of the above-described distributed antenna system 10, a description will be given of a distributed antenna system 10 and a service method of the distributed antenna system 10 according to various embodiments of the present invention.

The distributed antenna system 10 according to various embodiments of the present invention may transmit a target signal output from the remote unit 300 to the main unit 100 to improve the quality of the output signal, and the main unit 100 ) May analyze the difference between the received target signal and the reference signal. In addition, the remote unit 300 may adjust the frequency characteristic of the target path based on the difference value corresponding to the analyzed result.

Hereinafter, this will be described in detail.

6 is an exemplary view for explaining a method for adjusting frequency characteristics of a distributed antenna system according to various embodiments of the present invention.

Referring to FIG. 6, the analysis module 179 of the main unit 100 may receive a target signal output by the remote unit 300. Here, the target signal may be transmitted to the main unit 100 through the antenna of the remote unit 300, or may be transmitted from the remote unit 300 to the main unit 100 through the target path. The analysis module 179 may calculate a first difference value by comparing the received target signal with a reference signal. The equalizer 330 of the remote unit 300 may adjust the frequency characteristic of the target path passing through to output the target signal based on the first difference value.

For example, the main unit 100 may receive a target signal output by the antenna of the remote unit 300. The main unit 100 may compare the received target signal with the reference signal to calculate a first difference value corresponding to a difference between the frequency characteristic of the target signal and the frequency characteristic of the reference signal. The remote unit 300 may adjust the frequency characteristic of the target path based on the first difference value.

For another example, the main unit 100 may receive the target signal output by the remote unit 300 through the target path. The main unit 100 may compare the received target signal with the reference signal to calculate a first difference value corresponding to a difference between the frequency characteristic of the target signal and the frequency characteristic of the reference signal. The remote unit 300 may adjust the frequency characteristic of the target path based on the first difference value.

7 is an exemplary diagram of a method for adjusting frequency characteristics using a base station signal of a distributed antenna system according to various embodiments of the present invention.

Referring to FIG. 7, the main unit 100 may receive a base station signal from the base station 1a. Here, the base station signal may be used as a reference signal. In the following embodiments, it will be described that the reference signal is a base station signal.

The main unit 100 may transmit the received reference signal to the remote unit 300 through the target path. The remote unit 300 may transmit the reference signal received through the target path back to the main unit 100. Here, the reference signal received through the target path may be used as the first target signal. In the following embodiment, it is described that the first target signal is a reference signal received through the target path.

The analysis module 179 of the main unit 100 may compare the received first target signal with a reference signal received from the base station 1a to calculate a first difference value. The equalizer 330 of the remote unit 300 may adjust the frequency characteristic of the target path based on the first difference value. For example, the equalizer 330 may adjust the amplification degree or phase of the target path.

For example, the main unit 100 may receive a base station signal that is a reference signal from the base station 1a. The main unit 100 may transmit the received reference signal to the remote unit 300 through the target path. The remote unit 300 may transmit the reference signal received through the target path, which is the first target signal, to the main unit 100 through the antenna. The main unit 100 compares the first target signal received from the remote unit 300 with the reference signal received from the base station 1a, so that the first unit signal corresponds to a difference between the frequency characteristics of the first target signal and the reference signal frequency characteristic. 1 Difference value can be calculated. The remote unit 300 may adjust the frequency characteristic of the target path based on the first difference value.

As described above, since the distributed antenna system and the signal quality improvement method according to various embodiments of the present invention can check the state of a path transmitting a signal using a base station signal and improve it when the state of the path is abnormal, It is possible to check the distributed antenna system while operating the distributed antenna system and to improve the quality of the service signal.

8 is an exemplary diagram of a method for adjusting frequency characteristics using a test signal generated inside a distributed antenna system according to various embodiments of the present invention.

Referring to FIG. 8, the signal generation module 177 of the main unit 100 may generate a test signal. Here, the test signal can be used as a reference signal. In the following embodiment, it will be described that the reference signal is a generated test signal.

The main unit 100 may transmit the generated reference signal to the remote unit 300 through the target path. The remote unit 300 may transmit the reference signal received through the target path back to the main unit 100. Here, the reference signal received through the target path may be used as the first target signal. In the following embodiments, it is described that the first target signal is a reference signal received through the target path.

The analysis module 179 of the main unit 100 may calculate a first difference value by comparing the received first target signal with a reference signal that has been generated. The equalizer 330 of the remote unit 300 can adjust the frequency characteristic of the target path based on the first difference value.

For example, the main unit 100 may generate a test signal that is a reference signal. The main unit 100 may transmit the generated reference signal to the remote unit 300 through the target path. The remote unit 300 may transmit the reference signal received through the target path as the first target signal back to the main unit 100 using the target path. The main unit 100 compares the reference signal that generates the first target signal received from the remote unit 300 through the target path and corresponds to a difference between the frequency characteristic of the first target signal and the frequency characteristic of the reference signal. The difference value can be calculated. The remote unit 300 may adjust the frequency characteristic of the target path based on the first difference value.

As described above, in the distributed antenna system and the signal quality improvement method according to various embodiments of the present invention, a test signal is generated and the generated test signal is used to check the state of the signal transmission path of the distributed antenna system and the state of the transmission path is If it is abnormal, it can be improved.

9 is an exemplary view of a method of changing and changing a signal allocation order of a distributed antenna system according to various embodiments of the present invention.

Hereinafter, for convenience of description, a case where four base stations 1a to 1d and four antennas 301 to 304 of the remote unit 300 are described will be described as an example, but the present invention is not limited thereto. The number of (1a ~ 1d) and the number of antennas (301 ~ 304) of the remote unit 300 may be variously selected or variously set according to the design.

Also, for convenience of explanation, a case in which a path corresponding to the antenna A 301 is abnormal is described as an example, but is not limited thereto, and paths corresponding to other antennas are abnormal or paths corresponding to a plurality of antennas are described. It is natural that the present invention can be applied to abnormal cases.

Referring to FIG. 9, the main unit 100 may receive four base station signals (base station signal A, base station signal B, base station signal C and base station signal D) from four base stations 1a to 1d. Here, each of the base station signals (base station signal A, base station signal B, base station signal C and base station signal D) may be used as reference signals (reference signal A, reference signal B, reference signal C, reference signal D). . In the following embodiment, a case in which each base station signals are reference signals will be described.

The transceiver module 170 of the main unit 100 may allocate signals to the received four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) according to a preset signal assignment order. . The main unit 100 uses four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) through the respective paths (path A, path B, path C, path D) to the remote unit. 300. Here, each path (path A, path B, path C, path D) represents a path through which four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) pass respectively The number of lines, the number of components located on the line and the number of antennas are independent. For example, paths A to D may refer to one line, components located on one line, and one antenna, and paths A to D may include a plurality of different lines, paths, and components located on the line, respectively, and It can also mean an antenna.

In the transceiver module 370 of the remote unit 300, the received four reference signals (reference signal A, reference signal B, reference signal C, reference signal D) correspond to respective paths (path A) according to the signal allocation order. , Route B, route C, route D). The remote unit 300 re-mains the respective reference signals (reference signal A, reference signal B, reference signal C, reference signal D) that have passed through each route (path A, route B, route C, route D). It can be transmitted to the unit 100. Here, four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) that have passed each path (path A, route B, route C, route D) are the first target signals ( It may be used as the first target signal A, the first target signal B, the first target signal C, and the first target signal D). In the following embodiment, each of the first target signals (first target signal A, first target signal B, first target signal C, and first target signal D) is a reference signal (reference) Signal A, reference signal B, reference signal C, and reference signal D) will be described.

The analysis module 179 of the main unit 100 receives four first target signals (first target signal A, first target signal B, first target signal C, first target signal D) from four base stations First difference values (first difference value A, first difference value B) compared with reference signals (reference signal A, reference signal B, reference signal C, reference signal D) received from fields 1a to 1d, respectively , The first difference value C, the first difference value D) can be calculated.

The equalizer 330 of the remote unit 300 has the antenna A 301 based on the first difference values (first difference value A, first difference value B, first difference value C, first difference value D). The frequency characteristics of the included path (ie path A) can be adjusted.

In the first embodiment, a case in which four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) are output to different antennas through configurations located in different lines and lines, respectively do. The first target that is the reference signals (reference signal A, reference signal B, reference signal C, reference signal D) through which the remote unit 300 has passed the respective paths (path A, route B, route C, route D) The signals (first target signal A, first target signal B, first target signal C, first target signal D) may be transmitted to the main unit 100. The main unit 100 includes respective reference signals (reference signal A, reference signal B, reference signal C, reference signal D) and respective first target signals (first target signal A, first target signal B, first The first target signal C and the first target signal D may be compared to calculate respective first difference values (first difference value A, first difference value B, first difference value C, and first difference value D). have. Here, since the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) pass through configurations located in different lines and different lines, first difference values (first difference values) A, the first difference value B, the first difference value C, the first difference value D) may be different values, respectively. The remote unit 300 may adjust the frequency characteristic of the path A based on the respective first difference values (first difference value A, first difference value B, first difference value C, first difference value D). .

In a second embodiment, a case in which four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) are output to the same antenna through configurations located in different lines and different lines is described. do. The first target that is the reference signals (reference signal A, reference signal B, reference signal C, reference signal D) through which the remote unit 300 has passed the respective paths (path A, route B, route C, route D) The signals (first target signal A, first target signal B, first target signal C, first target signal D) may be transmitted to the main unit 100. The main unit 100 includes respective reference signals (reference signal A, reference signal B, reference signal C, reference signal D) and respective first target signals (first target signal A, first target signal B, first The first target signal C and the first target signal D may be compared to calculate respective first difference values (first difference value A, first difference value B, first difference value C, and first difference value D). have. Here, since the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) pass through configurations located in different lines and different lines, first difference values (first difference values) A, the first difference value B, the first difference value C, the first difference value D) may be different values, respectively. The remote unit 300 may adjust the frequency characteristic of the path A based on the respective first difference values (first difference value A, first difference value B, first difference value C, first difference value D). .

In a third embodiment, when some of the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) are output to different antennas through configurations located on the same line and the same line, respectively To explain. The first target that is the reference signals (reference signal A, reference signal B, reference signal C, reference signal D) through which the remote unit 300 has passed the respective paths (path A, route B, route C, route D) The signals (first target signal A, first target signal B, first target signal C, first target signal D) may be transmitted to the main unit 100. The main unit 100 includes respective reference signals (reference signal A, reference signal B, reference signal C, reference signal D) and respective first target signals (first target signal A, first target signal B, first The first target signal C and the first target signal D may be compared to calculate respective first difference values (first difference value A, first difference value B, first difference value C, and first difference value D). have. Here, since some of the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) pass through the same line and components located in the same line, first difference values (first difference value) Some of A, the first difference value B, the first difference value C, and the first difference value D) may be the same value. The remote unit 300 may adjust the frequency characteristic of the path A based on the respective first difference values (first difference value A, first difference value B, first difference value C, first difference value D). .

In the fourth embodiment, a case in which some of the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) is output to the same antenna through configurations located on the same line and the same line do. The first target that is the reference signals (reference signal A, reference signal B, reference signal C, reference signal D) through which the remote unit 300 has passed the respective paths (path A, route B, route C, route D) The signals (first target signal A, first target signal B, first target signal C, first target signal D) may be transmitted to the main unit 100. The main unit 100 includes respective reference signals (reference signal A, reference signal B, reference signal C, reference signal D) and respective first target signals (first target signal A, first target signal B, first The first target signal C and the first target signal D may be compared to calculate respective first difference values (first difference value A, first difference value B, first difference value C, and first difference value D). have. Here, since some of the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) pass through the same line and components located in the same line, first difference values (first difference value) Some of A, the first difference value B, the first difference value C, and the first difference value D) may be the same value. The remote unit 300 may adjust the frequency characteristic of the path A based on the respective first difference values (first difference value A, first difference value B, first difference value C, first difference value D). .

The transceiver module 170 of the main unit 100 may assign signals to the four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) again according to a preset signal allocation order. . The main unit 100 uses four reference signals (reference signal A, reference signal B, reference signal C, and reference signal D) through the respective paths (path A, path B, path C, path D) to the remote unit. 300.

In the transceiver module 370 of the remote unit 300, the received four reference signals (reference signal A, reference signal B, reference signal C, reference signal D) correspond to respective paths (path A) according to the signal allocation order. , Route B, route C, route D). The remote unit 300 returns the reference signals (reference signal A, reference signal B, reference signal C, reference signal D) that have passed each path (path A, route B, route C, route D) to the main unit ( 100). Here, the signal that has passed the improved path may be referred to as second target signals (second target signal A, second target signal B, second target signal C, and second target signal D). For example, a reference signal that has passed through a path with improved frequency characteristics may be referred to as a second target signal.

The analysis module 179 of the main unit 100 receives four second target signals (second target signal A, second target signal B, second target signal C, second target signal D) from four base stations Second difference values (second difference value A, second difference value B, compared to reference signals (reference signal A, reference signal B, reference signal C, reference signal D) received from fields 1a to 1d The second difference value C and the second difference value D) can be calculated.

The transceiver module 170 of the main unit 100 changes the signal allocation order based on the second difference values (second difference value A, second difference value B, second difference value C, second difference value D). Can be. In addition, the transceiver module 170 may determine the importance of four reference signals (reference signal A, reference signal B, reference signal C, reference signal D) transmitted by the four base stations 1a to 1d, The signal allocation order may be changed based on the determined importance and the calculated second difference values (second difference value A, second difference value B, second difference value C, and second difference value D).

As described above, the distributed antenna system and the method for improving signal quality according to various embodiments of the present disclosure can improve service signal quality by changing a signal allocation order.

In the above description, after improving the frequency characteristics, the service signal quality is improved by changing the path. However, the service quality improvement through the frequency characteristic improvement and the service quality improvement through the path change are in various orders according to selection or design. Can be combined. Alternatively, only one of the method of improving the frequency characteristics and the method of changing the path may be used.

10 is an exemplary view of a method of switching using a switch of a distributed antenna system according to various embodiments of the present invention.

Hereinafter, for convenience of description, a case in which there are two antennas 301 to 302 of the remote unit 300 will be described as an example, but is not limited thereto, and the antennas 301 to 302 of the remote unit 300 will be described. The number of can be variously applied according to the user's selection or the designer's settings.

Also, for convenience of description, a case in which a path corresponding to the antenna A 301 is abnormal is described as an example, but is not limited thereto, and a path corresponding to another antenna is abnormal or a path corresponding to a plurality of antennas. It is natural that the present invention can be applied even when is abnormal.

Referring to FIG. 10, the main unit 100 may transmit two reference signals (reference signal A, reference signal B) to the remote unit 300.

The transceiver module 370 of the remote unit 300 corresponds to two paths (path A, path) corresponding to the received reference signals (reference signal A, reference signal B) to the two antennas (antenna A, antenna B). B). The remote unit 300 may transmit respective reference signals (reference signal A, reference signal B) that have passed through the respective paths (path A, path B) to the main unit 100. Here, the reference signals (reference signal A, reference signal B) that have passed through the respective paths (path A, path B) may be referred to as first target signals (first target signal A, first target signal B). . Accordingly, the first target signals (first target signal A, first target signal B) refer to a signal through which the reference signals (reference signal A, reference signal B) have passed the target paths (path A, path B). Can be.

The analysis module 179 of the main unit 100 compares the received two first target signals (first target signal A, first target signal B) with reference signals (reference signal A, reference signal B) First difference values (first difference value A, first difference value B) may be calculated. The equalizer 330 of the remote unit 300 adjusts the frequency characteristic of the path (path A) corresponding to the antenna A 301 based on the first difference values (first difference value A, first difference value B). Can be.

In the first embodiment, a case in which two reference signals (reference signal A and reference signal B) are output to different antennas through different lines and configurations located on the line will be described. First target signals (first target signal A, first target signal B) that are reference signals (reference signal A, reference signal B) through which the remote unit 300 has passed each path (path A, path B) ) To the main unit 100. The main unit 100 compares each of the reference signals (reference signal A, reference signal B) and each of the first target signals (first target signal A, first target signal B), and each first difference value (1st difference value A, 1st difference value B) can be calculated. Here, since the two reference signals (reference signal A, reference signal B) pass through different lines and components located in different lines, first difference values (first difference value A, first difference value B) Can be different values. The remote unit 300 may adjust the frequency characteristic of the path A based on the first difference values (first difference value A, first difference value B).

As a second embodiment, a case in which two reference signals (reference signal A and reference signal B) are output to the same antenna through different lines and components located on the line is described. First target signals (first target signal A, first target signal B) that are reference signals (reference signal A, reference signal B) through which the remote unit 300 has passed each path (path A, path B) ) To the main unit 100. The main unit 100 compares each of the reference signals (reference signal A, reference signal B) and each of the first target signals (first target signal A, first target signal B), and each first difference value (1st difference value A, 1st difference value B) can be calculated. Here, since the two reference signals (reference signal A, reference signal B) pass through different lines and components located in different lines, first difference values (first difference value A, first difference value B) Can be different values. The remote unit 300 may adjust the frequency characteristic of the path A based on the first difference values (first difference value A, first difference value B).

As a third embodiment, a case in which two reference signals (reference signal A and reference signal B) are output to different antennas through the same line and components located on the line will be described. First target signals (first target signal A, first target signal B) that are reference signals (reference signal A, reference signal B) through which the remote unit 300 has passed each path (path A, path B) ) To the main unit 100. The main unit 100 compares each of the reference signals (reference signal A, reference signal B) and each of the first target signals (first target signal A, first target signal B), and each first difference value (1st difference value A, 1st difference value B) can be calculated. Here, since the two reference signals (reference signal A, reference signal B) pass through the same line and components located on the same line, the first difference values (first difference value A, first difference value B) are mutually It can be the same value. The remote unit 300 may adjust the frequency characteristic of the path A based on the first difference values (first difference value A, first difference value B).

In the fourth embodiment, a case in which two reference signals (reference signal A and reference signal B) are output to the same antenna through the same line and components located on the line is described. First target signals (first target signal A, first target signal B) that are reference signals (reference signal A, reference signal B) through which the remote unit 300 has passed each path (path A, path B) ) To the main unit 100. The main unit 100 compares each of the reference signals (reference signal A, reference signal B) and each of the first target signals (first target signal A, first target signal B), and each first difference value (1st difference value A, 1st difference value B) can be calculated. Here, since the two reference signals (reference signal A, reference signal B) pass through the same line and components located on the same line, the first difference values (first difference value A, first difference value B) are mutually It can be the same value. The remote unit 300 may adjust the frequency characteristic of the path A based on the first difference values (first difference value A, first difference value B).

The main unit 100 may transmit the reference signals (reference signal A, reference signal B) back to the remote unit 300.

The transceiver module 370 of the remote unit 300 corresponds to two paths (path A, path) corresponding to the received reference signals (reference signal A, reference signal B) to the two antennas (antenna A, antenna B). B). The remote unit 300 may transmit the reference signals (reference signal A and reference signal B) that have passed through the respective paths (path A and path B) to the main unit 100 again. Here, the signals that have passed the improved path may be referred to as second target signals (second target signal A, second target signal B). For example, a reference signal that has passed through a path with improved frequency characteristics may be referred to as a second target signal.

The analysis module 179 of the main unit 100 compares the received two second target signals (second target signal A, second target signal B) with reference signals (reference signal A, reference signal B), respectively. By doing so, the second difference values (second difference value A, second difference value B) may be calculated.

The switch module 340 of the remote unit 300 is based on the second difference values (the second difference value A, the second difference value B), the path corresponding to the antenna A 301 (path A) is the antenna B ( 302) corresponding to the path (path B).

In the first embodiment, a case where the switch module 340 of the remote unit 300 changes the antenna outputting a signal based on the second difference value (the second difference value A, the second difference value B) do. The main unit 100 is second target signals (second target signal A, second target) which are reference signals (reference signal A, reference signal B) that have passed paths (path A, path B) with improved paths. The signal B) can be received from the remote unit 300. The main unit 100 compares the second target signals (the second target signal A and the second target signal B) with the reference signals (reference signal A and reference signal B) and compares the second difference values (the second difference value) A, the second difference value B) can be calculated. The remote unit 300 may change the antenna connected to the path A from the antenna A to the antenna B based on the second difference values (second difference value A, second difference value B). Accordingly, the remote unit 300 may change the antenna connected to the path B from the antenna B to the antenna A to prevent signal collision.

In the second embodiment, a case where the switch module 340 of the remote unit 300 changes the second difference value (the second difference value A, the second difference value B) and part of the path A will be described. The main unit 100 is second target signals (second target signal A, second target) which are reference signals (reference signal A, reference signal B) that have passed paths (path A, path B) with improved paths. The signal B) can be received from the remote unit 300. The main unit 100 compares the second target signals (the second target signal A and the second target signal B) with the reference signals (reference signal A and reference signal B) and compares the second difference values (the second difference value) A, the second difference value B) can be calculated. The remote unit 300 may change the connection structure in the middle of the path A to the path B based on the second difference values (the second difference value A and the second difference value B). Accordingly, the remote unit 300 may change the connection structure in the middle of the path B to the path A in order to prevent signal collision.

As described above, the distributed antenna system and the method for improving signal quality according to various embodiments of the present disclosure may improve service quality by switching at least a part of a path.

In the above description, it has been described that the service signal quality is improved by using only one switch module 340, but the use of multiple switch modules 340 can be variously designed according to the designer's selection.

In the above description, after improving the frequency characteristics, the service signal quality is improved by changing the path. However, the service quality improvement through the frequency characteristic improvement and the service quality improvement through the path change are in various orders according to selection or design. Can be combined. Alternatively, only one of the method of improving the frequency characteristics and the method of changing the path may be used.

11 is a flowchart of a method for improving signal quality when a reference signal is a base station signal according to various embodiments of the present invention.

Referring to FIG. 11, the main unit 100 may receive a first target signal from the remote unit 300 (S1101). The main unit 100 may compare the reference signal received from the base station 1 and the first target signal received from the remote units 300a to 300n to determine whether there is a difference between the first target signal and the reference signal (S1103). ). When there is a difference between the first target signal and the reference signal, the main unit 100 may calculate a first difference value (S1105). The remote unit 300 may adjust the frequency characteristic of the target path, which is a path in which the first target signal is transmitted from the base station 1 to the terminal (not shown) based on the first difference value (S1107 ). The main unit 100 may receive a second target signal that has passed through the target path whose frequency has been adjusted from the remote unit 300 (S1109). The main unit 100 may check whether there is a difference between the received second target signal and the reference signal (S1111). If there is a difference between the second target signal and the reference signal, the main unit 100 may calculate a second difference value (S1113). The main unit 100 or the remote unit 100 may switch paths based on the second difference value (S1115).

12 is a flowchart illustrating a method for improving signal quality when a reference signal is a test signal according to various embodiments of the present invention.

Referring to FIG. 12, the main unit 100 may generate a test signal that is a reference signal (S1201). The main unit 100 may receive a first target signal from the remote unit 300 (S1203). The main unit 100 may compare the generated reference signal with the first target signal received from the remote unit 300 to determine whether there is a difference between the first target signal and the reference signal (S1205). When there is a difference between the first target signal and the reference signal, the main unit 100 may calculate a first difference value (S1207). The remote unit 300 may adjust the frequency characteristic of the target path, which is a path in which the first target signal is transmitted from the base station 1 to the terminal (not shown) based on the first difference value (S1209). The main unit 100 may receive the second target signal that has passed through the target path whose frequency has been adjusted from the remote unit 300 (S1211). The main unit 100 may check whether there is a difference between the received second target signal and the generated reference signal (S1213). When there is a difference between the second target signal and the reference signal, the main unit 100 may calculate a second difference value (S1215). The main unit 100 or the remote unit 300 may switch paths based on the second difference value (S1217).

As described above, the technical idea of the present invention has been described in detail with various embodiments, but the technical idea of the present invention is not limited to the above embodiments, and has ordinary knowledge in the art within the scope of the technical idea of the present invention. Various modifications and changes are possible.

1a~1n: BTS 10: distributed antenna system
30: POI 50: NMS
100: main unit 110: RF module
120: baseband module 150: backplane
170: transceiver module 171: FPGA
173: CPU 175: spectrum analysis module
177: signal generation module 179: analysis module
180: channel scanner 190: power supply module
200: hub unit 270: transceiver module
290: power supply module 300a ~ 300n: remote unit
310: RF module 330: equalizer
340: switch module 370: transceiver module
301 ~ 304: Antenna

Claims (12)

The analysis module, receiving a first target signal output by the remote unit;
The analyzing module comparing the first target signal and a reference signal to calculate a first difference value between the first target signal and the reference signal; And
An equalizer adjusting frequency characteristics of a target path, which is a path on a distributed antenna system for outputting the first target signal, based on the first difference value;
Containing,
Method for improving signal quality of distributed antenna system.
According to claim 1,
The step of receiving the first target signal,
The analysis module, the base station signal transmitted by the base station connected to the distributed antenna system includes the step of receiving the first target signal that is a signal output to the remote unit through the target path, the output signal,
The step of calculating the first difference value,
And the analyzing module, comparing the first target signal and the base station signal, calculating the first difference value between the first target signal and the base station signal,
Method for improving signal quality of distributed antenna system.
According to claim 1,
A signal generation module, generating a test signal which is the reference signal for measuring a state of the target path;
Further comprising,
The step of receiving the first target signal,
The analysis module includes the step of receiving the first target signal, which is a signal that is generated by transmitting the generated test signal to the remote unit through the target path, and outputting the signal.
The step of calculating the first difference value,
And the analyzing module comparing the first target signal and the generated test signal, and calculating the first difference value between the first target signal and the test signal.
Method for improving signal quality of distributed antenna system.
According to claim 1,
The remote unit includes a plurality of antennas,
Receiving, by the analysis module, a second target signal of the target path whose frequency characteristic is adjusted from the remote unit;
Calculating, by the analysis module, a second difference value by comparing the second target signal and the reference signal; And
The transceiver module, based on the second difference value, changing a signal allocation order associated with an antenna to be output among a plurality of antennas of the remote unit;
Further comprising,
Method for improving signal quality of distributed antenna system.
The method of claim 4,
The step of changing the signal allocation order is:
Determining, by the transceiver module, the importance of a plurality of base station signals transmitted by a plurality of base stations connected to the distributed antenna system;
Changing, by the transceiver module, the signal allocation order based on the second difference value and the determined importance.
Containing,
Method for improving signal quality of distributed antenna system.
According to claim 1,
The remote unit includes a plurality of antennas,
Receiving, by the analysis module, a second target signal of the target path whose frequency characteristic is adjusted from the remote unit;
Calculating, by the analysis module, a second difference value by comparing the second target signal and the reference signal; And
A switch module changing at least some paths of the target path based on the second difference value;
Further comprising,
Method for improving signal quality of distributed antenna system.
In the sub-system included in the distributed antenna system,
An analysis module for receiving a first target signal output by the remote unit, comparing the first target signal with a reference signal, and calculating a first difference value between the first target signal and the reference signal; And
An equalizer for adjusting a frequency characteristic of a target path that is a path on a distributed antenna system for outputting the first target signal based on the first difference value;
Containing,
Subsystem.
The method of claim 7,
The reference signal,
A base station signal transmitted by a base station connected to the distributed antenna system,
The first target signal,
The base station signal is a signal transmitted and output to the remote unit through the target path,
Subsystem.
The method of claim 7,
A signal generation module generating a test signal which is the reference signal for measuring the state of the target path;
Further comprising,
The analysis module,
The generated test signal is transmitted to the remote unit through the target path and receives the first target signal, which is an output signal, and compares the first target signal with the generated test signal, so that the first target signal Calculating the first difference value between and the test signal,
Subsystem.
The method of claim 7,
A transceiver module for changing a signal allocation order associated with an antenna to be output among a plurality of antennas of the remote unit based on a second difference value;
Further comprising,
The remote unit includes a plurality of antennas,
The analysis module,
Receiving the second target signal of the target path in which the frequency characteristic is adjusted from the remote unit, and comparing the second target signal and the reference signal to calculate the second difference value,
Subsystem.
The method of claim 10,
The transceiver module,
Determining the importance of a plurality of service input signals transmitted by a plurality of base stations connected to the distributed antenna system, and changing the signal allocation order based on the second difference value and the determined importance;
Subsystem.
The method of claim 7,
A switch module for changing at least some paths of the target path based on a second difference value;
Further comprising,
The remote unit includes a plurality of antennas,
The analysis module,
Receiving the second target signal of the target path in which the frequency characteristic is adjusted from the remote unit, and comparing the second target signal and the reference signal to calculate the second difference value,
Subsystem.

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