KR100782922B1 - Repeater signal complement system - Google Patents

Abstract

A repeater signal complement system is provided to enable a user to randomly control input signal size of equipment using an RF(Radio Frequency) signal, so a signal suitable for a repeater reference input signal is incoming, thereby offering a stable service. A donor antenna(10) receives a signal from a base station. A repeater(30) relays the signal. A service antenna(40) delivers the relayed signal to a terminal(50). A dual LNA(Low Noise Amplifier)(20) is disposed between the donor antenna(10) and the repeater(30), and controls size of the signal received from the donor antenna(10) to deliver the controlled signal to the repeater(30).

Description

Repeater Signal Complement System

1 is a diagram showing a repeater signal complementary system according to an embodiment of the present invention.

2 is a diagram showing the internal configuration of one example of the repeater of FIG.

3 is a view showing the appearance of the dual amplifier of FIG.

4 is a schematic representation of the internal circuitry of the dual amplifier of FIG.

5 is a circuit diagram showing in detail the configuration of the transmitter of the dual amplifier of the present invention.

6 is a graph showing signal improvement in synchronous and asynchronous with the dual amplifier of the present invention.

7A to 7D are diagrams showing actual signal improvement in a forest resort to which the dual amplifier of the present invention is applied.

      <Description of Symbols for Main Parts of Drawings>

10: donor antenna 20: dual amplifier

30: repeater 40: service antenna

50: terminal

The present invention relates to a repeater signal supplement system, and more particularly, to a repeater signal supplement system capable of ameliorating defective and service failures caused by a weak signal by amplifying a signal received by a donor antenna and transferring the signal to a repeater.

The base station forms a wireless communication channel with the terminal 50 by transmitting a signal to the specific terminal 50 and receiving a corresponding response signal from the terminal 50. In other words, the base station may form a wireless communication channel with a plurality of terminals 50 within a specific area boundary divided into cells, and selectively transmit a signal having a predetermined size after the wireless communication channel is formed. Such a base station has a predetermined distance for transmitting and receiving signals, and thus, the base stations are generally installed at specific distance intervals. However, the signal transmitted and received between the terminal 50 and the base station may be attenuated in a situation having a feature or a specific environment, and in some cases, a shadow area in which a signal cannot be transmitted or received occurs. That is, even if the same distance from the base station, even if the same distance within the area that can transmit and receive signals, there is a region that can not transmit and receive signals at a distance over a certain area. In addition, the base station is a variety of facilities to be built in the installation, a portion that requires a certain condition to install the base station occurs.

In order to install a base station and to transmit and receive a signal in or within a base station, a repeater capable of relaying a signal from the base station is used. That is, the repeater is disposed between the base station and the terminal 50 to amplify and reproduce the signal transmitted from the base station and transmit the signal to the terminal 50, thereby extending the actual signal transmission / reception distance of the base station and improving call quality. And it can be installed in the area where the base station is difficult to solve the area where the call is impossible.

RF (Radio Frequency) signal delivered to the repeater can operate properly only if there is an input signal as a reference, but if the wireless environment does not meet the repeater input signal criteria, it may cause a failure of the repeater. In addition, the RF signal input to the repeater should have a predetermined size or more, if the size of the RF signal that can be received in a specific region is less than the reference may occur when the repeater installation itself is impossible. Due to these problems, there is a problem that the utility of the equipment using the RF signal is inferior.

That is, conventionally, there is a problem in that the external RF signal is weak, so that the repeater cannot be installed or does not operate properly even if it is installed. In addition, the repeater that simultaneously services the sync / asynchronous signal with one donor antenna may have a problem in that a service imbalance or a failure may occur due to a different magnitude of the input sync / asynchronous signal. Similarly, the conventional repeater has a problem in that the size of the input signal changes correspondingly when the external environment changes, but there is a problem in that countermeasures are insufficient. As a result, the call quality is very low due to various problems described above, and customer complaints are exploding.

An object of the present invention is to solve the above problems, the user can arbitrarily adjust the size of the input signal of the equipment using the RF signal by repeating the repeater signal that can provide a stable service by introducing a signal suitable for the repeater reference input signal To provide a system.

In addition, another object of the present invention is to provide a repeater signal complementary system that can provide a stable service and a good call quality by the user adjusts the signal level input by the donor antenna as a reference.

In addition, another object of the present invention is to provide a repeater signal supplement system that can solve the service imbalance situation that may occur due to the size imbalance of the synchronous / asynchronous signal, respectively by adjusting the synchronous / asynchronous signal of the input signal.

In order to achieve the above object, a repeater signal supplement system according to an embodiment of the present invention comprises a donor antenna for receiving a signal from the base station; A repeater for relaying the signal; A service antenna for transmitting the relayed signal to a terminal; And a dual amplifier disposed between the donor antenna and the repeater to adjust a magnitude of a signal from the donor antenna and transmit the signal to the repeater.

The dual amplifier may include a synchronization signal adjusting unit for adjusting a magnitude of a signal according to a synchronization method among the received signals; And an asynchronous signal adjusting unit for adjusting the magnitude of the signal according to the asynchronous method among the received signals.

At least one of the synchronization signal controller and the asynchronous signal controller may include a dip switch configured to adjust a gain of an input signal.

The dual amplifier may include an antenna terminal connected to the donor antenna; A 3G stage for adjusting a size of a signal according to a 3G communication method among signals received from the donor antenna; A 2G stage adjusting a magnitude of a signal according to a 2G communication method among signals received from the donor antenna; A reference terminal connected to the repeater; A connector to which a cable for power supply is connected; And an alarm unit indicating whether power is supplied and whether the device is normal.

The dual amplifier is characterized in that the low noise amplifier.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a repeater signal supplement system according to an embodiment of the present invention.

Referring to FIG. 1, a repeater signal supplement system according to an exemplary embodiment of the present invention includes a donor antenna 10, a repeater 30, a service antenna 40, and a dual low noise amplifier 20. do.

The donor antenna 10 is an antenna for transmitting and receiving a signal with a base station. The donor antenna 10 is preferably installed in the direction of the base station for smooth signal transmission and reception with the base station, and thus may be installed with one direction.

The repeater amplifies the signal to reach the signal of the base station in the shade area such as a tunnel or underground parking lot, which is blocked by the mountains, buildings or other features, and serves the shade area by amplifying the signal so that the signal of the base station can reach it. It means a device that connects the signal of the terminal 50 to reach the base station. In addition, it is being used for expanding cell coverage at low cost. Referring to the operation principle of the repeater, the base station signal received through the donor antenna 10 is input to the low noise amplifier (LNA) through the duplexer to low noise amplification, and the amplified signal is mixed with the oscillation frequency of the local oscillator to an intermediate frequency Down convert. In the middle frequency band, the surface acoustic wave (SAW) filter having excellent skirt characteristics passes only the desired frequency band, upconverts it, amplifies it through a high power amplifier, and then uses a service antenna 40 to shade the area. To service. On the contrary, the signal of the terminal 50 is received by the service antenna 40 and amplified and filtered through the filters and amplifiers, and then connected to the base station through the donor antenna 10. The advantages of the RF repeater are suitable for small building services, and the cost of the facility is very low. However, since there are problems of securing antenna isolation and 'Near Far', a variable wave repeater can be used to compensate for the disadvantage of the RF repeater.

The variable frequency repeater converts an RF signal of a base station into an empty FA signal that is not used, transmits it to an antenna, and then receives the signal from a remote site and converts it back to the original frequency path, thereby preventing oscillation because the frequency between input and output antennas is different. The advantage of variable repeater is that it is easy to secure antenna isolation, so it can secure coverage of a rather large area, and it is suitable for the area that is difficult to secure isolation, but because the empty frequency band is necessary in the band allocated to the variable repeater, in-band frequency It may be difficult to use in urban areas with high usage rates.

A schematic configuration of such a repeater is shown in FIG.

Referring to FIG. 2, the repeater 30 includes a forward processor 200 and a reverse processor 205.

The forward processing unit 200 includes a first low noise amplifier 212, a first down converter 214, a first surface acoustic wave filter 216, a first up converter 218, a first high frequency band filter 220, and a first high frequency band filter 220. A power amplifier 222. The reverse processor 205 may include a second low noise amplifier 232, a second down converter 234, a second surface acoustic wave filter 236, a second up converter 238, a second high frequency band filter 240, and a second high frequency band filter 240. Two power amplifiers 242. A donor side duplexer 210 is connected between the first low noise amplifier 212 and the second power amplifier 242 to apply a call signal received through the donor antenna 202 to the forward processor 200, and the donor antenna. The signal from the reverse processor 205 is transmitted to the base station via 202. A coverage side duplexer 230 is connected between the first power amplifier 222 and the second low noise amplifier 232, so that the signal amplified from the forward processing unit 200 is a coverage antenna 204. And the call frequency of the mobile station received through the coverage antenna 204 is applied to the reverse processor 205.

The first low noise amplifier 212 low noise amplifies the high frequency signal input from the donor side duplexer 210 and applies it to the first down converter 214 to be described later. The first down converter 214 converts the low noise amplified high frequency signal into an intermediate frequency that is easy to filter. The first surface acoustic wave filter 216 applies surface acoustic wave filtering on the intermediate frequency signal to the first upconverter 218 to be described later. The first upconverter 218 converts the surface acoustic wave filtered intermediate frequency signal from the first surface acoustic wave filter 216 into a high frequency signal.

The 1RF band filter 220 performs band-pass filtering on the up-converted high frequency signal to the coverage side duplexer 230.

The second low noise amplifier 232 low noise amplifies the signal applied from the coverage side duplexer 230 and applies it to the second down converter 234 which will be described later. The second down converter 234 converts the low noise amplified high frequency signal into an intermediate frequency signal which is easy to filter. The second surface acoustic wave filter 236 filters the surface acoustic wave of the intermediate frequency signal. The second upconverter 238 converts the surface acoustic wave filtered intermediate frequency signal from the second surface acoustic wave filter 236 into a high frequency signal. The second high frequency band filter 240 band-filters the up-converted high frequency signal to the donor side duplexer 210.

A repeater having such a configuration is connected to a plurality of base stations in communication with each other, and a mobile station existing in a shadowed area other than the service area of the base station is connected to the wireless base station through the repeater 200.

 On the other hand, the repeater in the present invention has been described as a representative of the RF repeater as shown in Figure 2, the present invention is not limited thereto. That is, the repeater described in the present invention may be applied to any relay system capable of relaying a signal between the base station and the terminal 50, such as an RF repeater, a wave repeater, an optical repeater, and preferably applied to an RF repeater. Could be. In addition, in the detailed description of the present invention, the RF repeater can be applied not only to the form described in the present invention but also to a change in device and a change in configuration.

The service antenna 40 is an antenna for transmitting the signal transmitted through the repeater 30 to the terminal 50 among the signals transmitted from the base station.

The dual amplifier 20 is disposed between the donor antenna 10 and the repeater 30 to amplify the signal received by the donor antenna 10 and transmit the amplified signal to the repeater 30. 3 is a view showing the appearance of a dual amplifier 20 according to an embodiment of the present invention, Figure 4 is a schematic diagram showing an internal circuit of the dual amplifier 20 according to an embodiment of the present invention.

Referring to FIG. 3, the dual amplifier 20 includes an ANT stage ANT connected to the donor antenna 10 side, a REP stage REP connected to the repeater 30 side, and a 3G among the input signals. ) 3G stage (3G) to adjust the signal, 2G stage (2G) to adjust the 2G signal of the input signal, the connector (DC) to which the power is input, the alarm (lamp) indicating the power supply and normal status It is configured to include. As shown in FIG. 4, the dual amplifier 20 having such an external configuration has a synchronization signal controller 22 for amplifying and adjusting the synchronization signal when the input signal is a synchronous method, and the input signal is asynchronous. In one case is configured to include an asynchronous signal control unit 24 for amplifying and adjusting the asynchronous signal.

The ANT stage ANT is a stage connected to the donor antenna 10 and transmits a signal received by the donor antenna 10 to the dual amplifier 20.

The REP stage REP is connected to the repeater 30 so as to transfer the signal adjusted by the internal synchronous signal controller 22 and the asynchronous signal controller 24 of the dual amplifier 20 to the repeater 30. to be.

The 3G stage 3G is a stage for controlling signals transmitted and received according to 3G mobile communication schemes such as 3G, for example, CDMA2000, IMT2000, and W-CDMA, among the signals received by the donor antenna 10. The 3G stage 3G is connected to the second dip switch 25 of the asynchronous signal control unit 24 having a substantially internal configuration, thereby controlling its size by adjusting the gain of the signal. In the present invention, the 3G stage (3G) is described as a stage for transmitting and receiving an asynchronous signal, the third generation mobile communication system can be applied to either of the synchronous and asynchronous method, accordingly, the 3G stage (3G) It may be possible to adjust the gain of the synchronous signal as well as the asynchronous signal.

The 2G stage 2G is a stage for adjusting signals transmitted and received according to 2G, for example, a CDMA communication scheme, among the signals received by the donor antenna 10. The 2G stage 2G is connected to the first dip switch 23 of the synchronization signal adjusting unit 22 having a substantially internal configuration, thereby adjusting its size by adjusting the gain of the 2G signal. In the present invention, the 2G stage (2G) is described as a stage for adjusting the synchronization signal, but if the communication method adopted in the 2G is asynchronous, it will be possible to adjust the size of the asynchronous signal in the same manner as the synchronization signal size control.

The connector DC is a place where a cable for supplying power to the dual amplifier 20 is connected and is actually a place where a DC power supply of 12V 1A is connected.

When the cable is connected to the connector DC and the power is supplied, the lamp indicates that the lamp is displayed in green or yellow, indicating that the power supply is normally performed, and the other internal configuration of the dual amplifier 20 is also applied. No abnormality is indicated.

The synchronization signal controller 22 is composed of a transmitter Tx and a receiver Rx, and receives and amplifies and adjusts a signal according to a synchronization method among the signals transmitted from the ANT terminal ANT and transmits the signal to the repeater 30. Do this. The synchronization signal controller 22 includes a first dip switch 23 for signal control.

The asynchronous signal controller 24 is composed of a transmitter Tx and a receiver Rx similar to the synchronous signal controller 22, and receives and amplifies a signal according to an asynchronous method among the signals transmitted from the ANT terminal ANT. The control is delivered to the repeater 30. The asynchronous signal controller 24 also includes a second dip switch 25 to adjust the gain of the asynchronous signal.

5 is a diagram illustrating an actual circuit of the transmitter Tx included in the synchronous signal controller 22 and the asynchronous signal controller 24. As shown in FIG. 5, each of the transmitters of the synchronous signal controller 22 and the asynchronous signal controller 24 of the dual amplifier 20 according to an exemplary embodiment of the present invention includes a filter unit for filtering a corresponding frequency, and a signal. It can be seen that it consists of an amplifier to adjust the size of the DIP switch and a dip switch to adjust the size of the signal.

In the repeater signal complementary system according to the embodiment of the present invention having such a configuration, by dividing the input signal into a synchronous signal and an asynchronous signal, respectively, the signal level between the synchronous signal and the asynchronous signal can be reduced. Accordingly, the signal levels of the synchronous signal and the asynchronous signal can be adjusted, so that signal attenuation and noise due to size unbalance of the synchronous signal and the asynchronous signal can be suppressed. In addition, the repeater signal complementary system according to the present invention provides the effect of stabilizing the service by performing signal amplification or signal control as shown in FIG.

Specifically, the upper left graph of FIG. 6 is a value obtained by checking a level of a signal received according to a synchronization method without using the dual amplifier 20. As shown, the level of the received signal according to the synchronization scheme represents -72.41 dBm. On the other hand, the lower left graph of Figure 6 is a value of the signal level according to the synchronization method in the state using the dual amplifier 20. As shown, the signal level is -57.04 dBm, which can be seen to be improved by more than 15 dBm compared to before use.

In addition, the upper right graph of FIG. 6 is a value obtained by checking a level of a signal received according to an asynchronous method without using the dual amplifier 20, and as shown in the drawing, it is -76.65 dBm. On the other hand, the lower right graph of Figure 6 is a value of the signal level according to the asynchronous method in the state using the dual amplifier 20, as shown, the signal level is -63.78 dBm, it can be seen that the gain value is improved by more than 13 dBm. Can be.

On the other hand, Figures 7a to 7d is a diagram showing an example of the application in the actual forest recreation forest and the like. FIG. 7A illustrates a forest recreation forest demonstration area, and FIG. 7B illustrates an external input signal value inspected in FIG. 7A. FIG. 7C is a diagram illustrating a signal amplified by an external input signal using the dual amplifier 20, and FIG. 7D is a diagram illustrating an output through the repeater 30 after transferring the amplified signal to the repeater 30. As shown in FIGS. 7A to 7D, it can be seen that a good repeater can be used by amplifying the external input signal using a dual amplifier in a forest recreation forest where the external input signal is very low.

As described above, the repeater signal complementary system according to an embodiment of the present invention provides a stable service by allowing a user to arbitrarily adjust an input signal size of equipment using an RF signal to introduce a signal suitable for the repeater reference input signal. To provide a.

In addition, the repeater signal complementary system according to an embodiment of the present invention can provide a stable service and a good call quality by the user adjusts the signal level input by the donor antenna as a reference.

In addition, the repeater signal complementary system according to the embodiment of the present invention can solve the service imbalance caused by the difference between the synchronous and asynchronous input signals by separately adjusting and adjusting the synchronous signal and the asynchronous signal. Accordingly, by not moving or replacing the fixed donor antenna, it is possible to reduce facility costs and operating costs.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (5)

A donor antenna for receiving a signal from a base station; A repeater for relaying the signal; A service antenna for transmitting the relayed signal to a terminal; And And a dual amplifier disposed between the donor antenna and the repeater to adjust a magnitude of a signal from the donor antenna and transmit the magnitude of the signal to the repeater. The dual amplifier may include an antenna terminal connected to the donor antenna; A 3G stage for adjusting a size of a signal according to a 3G communication method among signals received from the donor antenna; A 2G stage adjusting a magnitude of a signal according to a 2G communication method among signals received from the donor antenna; A reference terminal connected to the repeater; A connector to which a cable for power supply is connected; And an alarm unit indicating whether power is supplied and whether or not the device is in a normal state. The method of claim 1, The dual amplifier A synchronization signal adjusting unit which adjusts a magnitude of a signal according to a synchronization method among the received signals by adjusting a gain of a signal received from the donor antenna by a dip switch; And And an asynchronous signal adjusting unit for adjusting a magnitude of a signal according to an asynchronous method among the received signals by adjusting a gain of a signal received from the donor antenna by a dip switch. delete delete The method of claim 1, The dual amplifier Repeater signal supplement system, characterized in that the low noise amplifier.

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