KR20150145361A - Apparatus for processing signal in dual-polarization communication system and method for receiving signal - Google Patents

Apparatus for processing signal in dual-polarization communication system and method for receiving signal Download PDF

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Publication number
KR20150145361A
KR20150145361A KR1020140074528A KR20140074528A KR20150145361A KR 20150145361 A KR20150145361 A KR 20150145361A KR 1020140074528 A KR1020140074528 A KR 1020140074528A KR 20140074528 A KR20140074528 A KR 20140074528A KR 20150145361 A KR20150145361 A KR 20150145361A
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South Korea
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signal
symbol
horizontal
antenna
polarization
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KR1020140074528A
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Korean (ko)
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최성우
김일규
방승찬
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한국전자통신연구원
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Publication of KR20150145361A publication Critical patent/KR20150145361A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H04B7/065—Variable contents, e.g. long-term or short-short
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0882—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using post-detection diversity
    • H04B7/0885—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using post-detection diversity with combination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A signal processing apparatus and a signal receiving method in a dual polarization communication system are provided. In a device for transmitting and receiving signals using a dual polarized antenna, signals are received through a vertical direction antenna and a horizontal direction antenna, respectively, and an inclination indicating a horizontal state of the device is obtained. When the tilt angle is equal to or greater than the set angle, processing corresponding to the vertical polarization is performed on the signal received by the horizontal direction antenna, and processing corresponding to the horizontal polarization is performed on the signal received from the vertical direction antenna.

Description

[0001] The present invention relates to a signal processing apparatus and a signal receiving method in a dual-polarized communication system,

The present invention relates to a device for processing a signal in a communication system using a dual polarized antenna and a signal receiving method.

The polarization of an electromagnetic wave refers to the wave of an electric field component at a fixed point or a fixed surface perpendicular to the traveling direction of the electromagnetic wave. In radio communication technology, radio waves radiated through an antenna have a polarization characteristic inherent to each antenna. Linearly polarized waves exhibit polarization waves in which the electric field vector direction always vibrates only in a single one-dimensional direction. When the electromagnetic wave is horizontal to the ground, it is called horizontally polarized. When the electromagnetic wave is orthogonal to the earth, it is called vertically polarized. The horizontal polarization and the vertical polarization are orthogonal to each other.

1 is a diagram showing vertical polarization and horizontal polarization.

As shown in FIG. 1, the vertical polarization and the horizontal polarization undergo different path fading, and a polarization diversity gain can be obtained by using this phenomenon. By using the orthogonality between the vertical polarization and the horizontal polarization, different data can be transmitted to the polarization using the same frequency. This is data multiplexing using Dual-Polarized Multi Input Multi Output (MIMO).

With dual polarization MIMO multiplexing, the same frequency can be used to increase data throughput. Particularly, in the case of the LOS (Line of Sight) environment having a visible visible distance, since the influence of the reflector is small, there is little fear that the orthogonality of the two polarized waves is damaged. Therefore, the dual polarized MIMO multiplexing is effective It is means.

When a dual polarization MIMO multiplexing scheme is used, the transmission and reception antennas must be horizontally aligned with respect to the reference plane to distinguish between horizontal polarization and vertical polarization. Generally, since the base station transmitting antenna is fixed, it is horizontal with the earth, but the antenna of the terminal is not fixed, so there is a high probability that the antenna will not be level with the earth. If the antenna is not level with respect to the ground, it is impossible to multiplex the data, so an effective countermeasure is needed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal processing apparatus and a signal receiving method capable of accurately receiving a polarized wave signal in a dual polarized communication system using a dual polarized antenna.

According to an aspect of the present invention, there is provided a method of receiving signals in an apparatus for transmitting and receiving signals using a dual polarized antenna, the method comprising: receiving a signal through a vertical antenna and a horizontal antenna, Receiving; Obtaining an inclination indicating a horizontal state of the apparatus; Comparing the inclination with a preset angle; And performing a process corresponding to a vertical polarization with respect to a signal received by the horizontal direction antenna and a process corresponding to a horizontal polarization with respect to a signal received from the vertical direction antenna when the slope is equal to or greater than the set angle, .

Wherein the performing of the processing comprises: processing a signal received at the horizontal direction antenna to obtain a first received symbol; processing a signal received at the vertical direction antenna to obtain a second received symbol; Performing vertical polarization symbol processing on the first received symbol to obtain data transmitted on a vertical polarization; And performing horizontally polarized symbol processing on the second received symbol to obtain data transmitted on the horizontal polarized wave.

In addition, the signal receiving method may further include, when the inclination is smaller than the set angle, performing a process corresponding to a horizontal polarization with respect to a signal received by the horizontal direction antenna, And performing a process corresponding to the polarized wave.

According to another aspect of the present invention, there is provided a signal processing apparatus including: a horizontal direction antenna for transmitting and receiving signals using horizontal polarization; A vertical direction antenna for transmitting and receiving signals using vertical polarization; An analog signal processing unit for processing a signal received from the horizontal direction antenna to output a first symbol signal and processing a signal received from the vertical direction antenna to output a second symbol signal; A horizontal check unit for obtaining an inclination indicating a horizontal state of the apparatus; And a digital signal processor for comparing the inclination and the set angle and selectively performing vertical polarization symbol processing or horizontal polarization symbol processing on the first symbol signal and the second symbol signal according to a result of the comparison, .

The digital signal processing unit may perform vertical polarization symbol processing on the first symbol signal and horizontal polarization symbol processing on the second symbol signal when the inclination is equal to or greater than a set angle. The digital signal processing unit may perform a horizontal polarization symbol process on the first symbol signal and a vertical polarization symbol process on the second symbol signal when the tilt angle is smaller than a set angle.

The horizontal checking unit may be a leveling unit.

According to another aspect of the present invention, there is provided a signal processing apparatus including: a horizontal direction antenna for transmitting and receiving signals using horizontal polarization; A vertical direction antenna for transmitting and receiving signals using vertical polarization; An analog signal processing unit for processing a signal received from the horizontal direction antenna to output a first symbol signal and processing a signal received from the vertical direction antenna to output a second symbol signal; A digital signal processor for processing the first symbol signal and the second symbol signal to obtain corresponding data; A horizontal check unit for obtaining an inclination indicating a horizontal state of the apparatus; And an antenna controller for adjusting the inclination of the horizontal direction antenna and the vertical direction antenna according to the inclination.

The antenna control unit may adjust the tilt of the horizontal direction antenna and the vertical direction antenna when the tilt angle is equal to or greater than a set angle. Here, the digital signal processing unit performs horizontal polarization symbol processing on the first symbol signal to obtain first data transmitted using horizontal polarization, and performs vertical polarization symbol processing on the second symbol signal to generate vertical It is possible to obtain the second data transmitted using the polarization.

According to the embodiment of the present invention, in a dual polarized communication system, even when a plane oriented by an antenna is inclined between communication means, processing for a polarized wave signal received through an antenna is made different based on the inclination, Transmission and reception are performed. In addition, it is possible to easily measure the degree of tilt of the antenna using a low-cost level, and it is possible to transmit and receive error-free data using this tilt information.

1 is a diagram showing vertical polarization and horizontal polarization.
2 is a diagram illustrating a structure of a signal processing apparatus in a dual polarization communication system according to an embodiment of the present invention.
3 is a flowchart of a signal receiving method according to an embodiment of the present invention.
4 is an illustration showing data multiplexing in a dual polarization communication system according to an embodiment of the present invention.
5 is a diagram illustrating a structure of a signal processing apparatus in a dual polarization communication system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described with respect to a signal processing apparatus and a signal receiving method in a dual polarized wave communication system.

2 is a diagram illustrating a structure of a signal processing apparatus in a dual polarization communication system according to an embodiment of the present invention.

A signal processing apparatus 1 according to an embodiment of the present invention includes a first antenna 11, a second antenna 12, an analog signal processing unit 13, a digital signal processing unit 14, and a horizontal check unit 15 do.

The signal processing apparatus 1 according to the embodiment of the present invention receives a signal using a dual polarized antenna. The dual polarized antenna may be composed of one antenna, or two antennas having different vertical polarization and horizontal polarization . Here, a dual polarized antenna for signal transmission and reception is realized by two antennas, that is, a first antenna 11 that performs signal transmission and reception using horizontal polarization, and a second antenna 12 that performs signal transmission and reception using vertical polarization For example,

The signals received through the first and second antennas are input to the analog signal processing unit 13. The analog signal processing unit 13 receives a signal modulated at the center frequency and downconverts the signal to a baseband signal, and outputs the signal through a horizontal antenna symbol corresponding to the signal received through the first antenna, And outputs two baseband symbols of a vertical antenna symbol corresponding to the signal. The symbol output from the analog signal processing unit 13 is passed through an analogue to digital converter (ADC), and the analog signal processing unit 13 may be called an RF (radio frequency) / analogue unit.

The digital signal processor 14 outputs the first data corresponding to the horizontal antenna symbol input from the analog processor 13 and outputs the second data corresponding to the vertical antenna symbol. The process of processing the symbol signal to acquire the data uses a technique known in the art, and a detailed description thereof will be omitted here.

On the other hand, the horizontal check section 15 outputs an angle indicating the equilibrium state of the apparatus, in particular, the communication terminal in which the signal processing apparatus 1 is mounted. The horizontal check section 15 is also referred to as a "leveling period ", and outputs the inclination degree based on when the communication terminal is in a fully balanced state with the earth.

On the other hand, the digital signal processing unit 14 receives the valid symbols from the analog signal processing unit 13 and receives the inclination information input from the horizontal check unit 15, and then, based on the inclination information, Can be selected.

For example, if the slope is equal to or greater than a predetermined angle (for example, 45 degrees), most of the signals of the horizontal polarization and the vertical polarization are transmitted to the originally designated antenna And can be received via another antenna. Accordingly, when the tilt angle is equal to or greater than the predetermined angle, the digital signal processing unit 14 determines that the horizontal polarization signal and the vertical polarization signal are received through the antenna other than the corresponding antenna, and demodulates the data from the symbol based on the determination result . That is, the digital signal processing unit 14 determines that the symbol corresponding to the first antenna 11 corresponds to the vertically polarized signal, processes the symbol of the signal received through the first antenna 11, and outputs the second data. Further, it is determined that the symbol corresponding to the second antenna 12 corresponds to the horizontal polarization signal, and the symbol of the signal received through the second antenna is processed to output the first data.

Meanwhile, when the tilt angle is lower than the set angle, the digital signal processing unit 14 determines that the horizontal polarization signal and the vertical polarization signal are received through the original designated antenna, and outputs the symbol of the horizontal polarization signal received through the first antenna And processes the symbol of the vertically polarized signal received through the second antenna to output the second data.

In addition, the digital signal processor 14 restores the horizontal antenna symbol and the vertical antenna symbol into non-inclined symbols using the inclination information provided from the horizontal check unit 15. [

For this purpose, a relational expression indicating the correlation of the phase and amplitude of the signal with the change of the slope is required based on the reference slope, for example, the slope 0 degree. In order to obtain such a correlation, information about the beam pattern of the antenna may be previously stored.

For example, when the angle is inclined by?, The first symbol and the second symbol input to the digital signal processing unit 14 may be multiplied by -θ and restored to non-inclined symbols, respectively. That is, the horizontal antenna symbol

Figure pat00001
, The recovered symbol is
Figure pat00002
. Vertical antenna symbols can also be recovered in the same way.

However, when the gain varies depending on the angle at the receiving side, if the beam width of the antenna is less than the tap coefficient, the gain may vary greatly depending on the angle. When the change in the gain depending on the angle is not linear, a table showing the correlation between the angle and the gain can be used. For example, if it is determined that the antenna has a slope of 10 degrees and an antenna gain that is 3 dB lower than 0 degrees,

Figure pat00003
Can be compensated by multiplying the real part and the imaginary part of the symbol signal.

3 is a flowchart of a signal receiving method according to an embodiment of the present invention.

In a communication system that performs signal transmission and reception using a dual polarized antenna, data multiplexing that transmits different data to vertically polarized waves and horizontal polarized waves having the same frequency can be performed.

4 is an illustration showing data multiplexing in a dual polarization communication system according to an embodiment of the present invention.

As illustrated in FIG. 4, the base station 100 transmits a signal to the terminal 200 by transmitting different data in the vertical polarization and the horizontal polarization. The terminal 200 must receive signals transmitted from the base station 100 in a state of being horizontal to the ground as possible, but the situation occurs such that the terminal is not stationary and moves. Specifically, the transmission of the dual polarized wave uses vertical polarization and horizontal polarization. With respect to the earth, the means for transmitting radio waves and the means for receiving radio waves can be inclined at a certain angle for a certain period of time. However, when the angle of relative inclination of the radio wave transmitting means and the radio wave receiving means increases, the vertical polarized wave and the horizontal polarized wave are transmitted to different antennas.

For this, the signal processing apparatus 1 according to the embodiment of the present invention performs signal transmission according to data multiplexing using the dual polarization as shown in FIG. 4, and the first antenna 11, which is a horizontal direction antenna, When a signal is received through the second antenna 12 as a directional antenna (S100), the received signal is processed and a corresponding symbol signal is output as shown in FIG. 3 (S110).

When the level determining unit 15 determines that the equilibrium state of the terminal (e.g., 200 in FIG. 4) equipped with the apparatus 1 receiving the signal, that is, when the terminal 200 is in full equilibrium with the earth, (Step S120).

The digital signal processing unit 14 of the signal processing apparatus 1 compares the measured inclination with a preset angle for determining the equilibrium state of the terminal in step S130. If the measured inclination is equal to or greater than the preset angle, It is determined that the transmitted vertical and horizontal polarized waves from the transmitting side (for example, the base station) are received through an antenna other than the corresponding antenna. That is, it is determined that the signal corresponding to the horizontal polarization is received by the vertical antenna, not the horizontal antenna, and the signal corresponding to the vertical polarization is received by the horizontal antenna other than the vertical antenna (S140).

Accordingly, the digital signal processing unit 14 performs vertical polarization symbol processing on the symbols received by the horizontal direction antenna outputted from the analog signal processing unit 13 when the measured inclination is equal to or higher than the set angle. Accordingly, the data on the vertical polarization, that is, the second data, is obtained from the symbol received by the horizontal direction antenna (S150). And performs horizontal polarization symbol processing on the symbols received by the vertical direction antenna outputted from the analog signal processing unit 13. [ Accordingly, the data on the horizontal polarization, that is, the first data, is obtained from the symbol received by the vertical direction antenna (S160).

On the other hand, when the measured slope is smaller than the set angle, the terminal equilibrium state is maintained and it is judged that the vertical polarization and horizontal polarization transmitted from the transmission side (for example, the base station) are normally received through the corresponding antenna do. That is, it is determined that the signal corresponding to the horizontal polarization is received by the horizontal direction antenna and the signal corresponding to the vertical polarization is received by the horizontal direction antenna (S170).

Accordingly, when the measured inclination is smaller than the set angle, the digital signal processing unit 14 performs horizontal polarization symbol processing on the symbol received by the horizontal direction antenna outputted from the analog signal processing unit 13. Accordingly, the data on the horizontal polarization, that is, the first data, is obtained from the symbol received by the horizontal direction antenna (S180). And performs vertical polarization symbol processing on the symbols received by the vertical direction antenna outputted from the analog signal processing unit 13. [ Accordingly, the data on the vertical polarization, that is, the second data, is obtained from the symbol received by the vertical direction antenna (S190).

Meanwhile, in another embodiment of the present invention, the slope of the antenna is adjusted so that the directional plane of the antenna and the received polarized wave coincide with each other according to the slope information.

5 is a diagram illustrating a structure of a signal processing apparatus in a dual polarization communication system according to another embodiment of the present invention.

5, the signal processing apparatus 1 according to another embodiment of the present invention includes a first antenna 11, a second antenna 12, an analog signal processing unit 13, A digital signal processing unit 14 and a horizontal check unit 15, and further includes an antenna control unit 16.

The first antenna 11, the second antenna 12, the analog signal processing unit 13, the digital signal processing unit 14 and the horizontal verification unit 15 perform the same functions as those in the above embodiment. However, the digital signal processing unit 14 performs a general process of processing the symbols transmitted from the analog signal processing unit 13 to obtain data, and as described above, But does not perform polarization symbol processing.

Instead of the symbol processing based on the tilt information of the digital signal processing section 14, the antenna control section 16 adjusts the tilt of the antenna based on the tilt information. That is, the slope of the first antenna 11 as the horizontal direction antenna and the slope of the second antenna 12 as the vertical direction antenna are adjusted, and the slope of each antenna can be adjusted by using the slope information outputted from the horizontal determination unit 15 have. Here, the antenna control unit 16 can directly control the tilt of each antenna or transmit a control signal for adjusting the tilt of the antenna to each antenna according to the tilt information. In this case, each antenna may include a function of adjusting the tilt of the antenna in accordance with a control signal transmitted from the antenna control unit 16.

The antenna control unit 16 compares the inclination according to the inclination information with a predetermined angle. When the inclination is equal to or greater than the set angle, the antenna control unit 16 determines that the terminal equipped with the signal processing apparatus is not in a horizontal state, 2 antennas 11 and 12 to adjust the tilt of the antenna to a position corresponding to the horizontal state of the terminal.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (10)

In a method of receiving a signal in a device that transmits and / or receives signals using a dual polarized antenna,
Receiving signals through a vertical direction antenna and a horizontal direction antenna, respectively;
Obtaining an inclination indicating a horizontal state of the apparatus;
Comparing the inclination with a preset angle; And
Performing a process corresponding to a vertical polarization with respect to a signal received by the horizontal direction antenna and performing a process corresponding to a horizontal polarization with respect to a signal received from the vertical direction antenna when the inclination degree is equal to or greater than the set angle,
/ RTI > The method of claim 1, wherein
The step of performing the processing
Processing a signal received at the horizontal direction antenna to obtain a first received symbol and processing a signal received at the vertical direction antenna to obtain a second received symbol;
Performing vertical polarization symbol processing on the first received symbol to obtain data transmitted on a vertical polarization; And
Performing horizontal polarization symbol processing on the second received symbol to obtain data transmitted on a horizontal polarization;
/ RTI > The method of claim 1, wherein
And performs a process corresponding to a horizontal polarization with respect to a signal received from the horizontal antenna and performs a process corresponding to a vertical polarization with respect to a signal received from the vertical antenna if the inclination is smaller than the set angle ≪ / RTI > A horizontal direction antenna for transmitting and receiving signals using horizontal polarization;
A vertical direction antenna for transmitting and receiving signals using vertical polarization;
An analog signal processing unit for processing a signal received from the horizontal direction antenna to output a first symbol signal and processing a signal received from the vertical direction antenna to output a second symbol signal;
A horizontal check unit for obtaining an inclination indicating a horizontal state of the apparatus; And
A digital signal processor for comparing the inclination and the set angle and selectively performing vertical polarization symbol processing or horizontal polarization symbol processing on the first symbol signal and the second symbol signal according to the comparison result,
And a signal processing unit. The method of claim 4, wherein
Wherein the digital signal processing unit performs vertical polarization symbol processing on the first symbol signal and horizontal polarization symbol processing on the second symbol signal when the tilt angle is equal to or greater than a set angle. The method of claim 4, wherein
Wherein the digital signal processing unit performs horizontal polarization symbol processing on the first symbol signal and performs vertical polarization symbol processing on the second symbol signal when the inclination is smaller than a set angle. The method of claim 4, wherein
Wherein the horizontal check unit comprises a level gauge. A horizontal direction antenna for transmitting and receiving signals using horizontal polarization;
A vertical direction antenna for transmitting and receiving signals using vertical polarization;
An analog signal processing unit for processing a signal received from the horizontal direction antenna to output a first symbol signal and processing a signal received from the vertical direction antenna to output a second symbol signal;
A digital signal processor for processing the first symbol signal and the second symbol signal to obtain corresponding data;
A horizontal check unit for obtaining an inclination indicating a horizontal state of the apparatus; And
An antenna control unit for adjusting a tilt of the horizontal direction antenna and the vertical direction antenna according to the inclination,
And a signal processing unit. The method of claim 8, wherein
Wherein the antenna control unit adjusts the tilt of the horizontal direction antenna and the vertical direction antenna when the tilt angle is equal to or greater than a set angle. The method of claim 8, wherein
The digital signal processing unit performs horizontal polarization symbol processing on the first symbol signal to obtain first data transmitted using a horizontal polarization, and performs vertical polarization symbol processing on the second symbol signal to generate a vertical polarization To obtain second data to be transmitted.



KR1020140074528A 2014-06-18 2014-06-18 Apparatus for processing signal in dual-polarization communication system and method for receiving signal KR20150145361A (en)

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