Repeater for relaying MIMO communication in forward link between base station and terminals in building

Abstract

A repeater is disclosed. The disclosed repeater according to one embodiment is a repeater for relaying multi input multi output (MIMO) communication in a forward link between a base station and terminals in a building, and comprises: a first antenna; a second antenna; a first internal signal path which is connected to the first antenna, and which includes a forward signal path for processing a first forward signal received by the first antenna and a reverse signal path for processing reverse signals oriented from the terminals toward the base station; and a second internal signal path which is connected to the second antenna, and which processes a second forward signal received by the second antenna.

Description

Repeater for relaying MIMO communication on the forward link between a base station and terminals within a building

[0001] An embodiment of the present invention relates to a repeater.

[0002] A wireless communication system is a system for transmitting and receiving various types of content, such as voice, data, and video. A wireless communication system includes a multiple access system that supports communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Such a wireless multiple access communication system simultaneously supports communication for multiple wireless terminals, and each wireless terminal communicates with one or more base stations through forward and reverse link transmissions.

[0003] Here, the forward link (or down link) refers to a communication link from the base station through the repeater to each individual terminal, and the reverse link refers to a communication link from each individual terminal through the repeater to the base station. These communication links can be established using the SISO (Single Input Single Output) method, MISO (Multi Input Single Output) method, or MIMO (Multi Input Multi Output) method.

[0004] Meanwhile, in order to provide communication services of a standard quality or higher to each terminal located inside a building, one or more repeaters are installed on each floor, and these repeaters are classified according to the size of the building in which they are installed or the required output. While base stations support MIMO for transmit diversity, existing RF repeaters used in-building only support SISO, which presents the problem of slow data speeds. In other words, existing RF repeaters operate as SISO because they have a single RF path, and since they are structured in a way that prevents the installation of more than one receiving antenna, there is a problem with low data throughput.

[0005] FIG. 1 is a schematic diagram of a conventional in-building RF repeater. Referring to FIG. 1, the RF repeater (50) operates as a SISO that receives a signal from a base station (60) with one antenna, amplifies it, and then outputs the signal with one antenna. Therefore, a repeater capable of improving data throughput even within an in-building environment is required.

[0006] An embodiment of the present invention is intended to provide a repeater capable of improving data throughput even within a building.

[0007] A repeater according to one disclosed embodiment is a repeater for relaying Multi Input Multi Output (MIMO) communication in a forward link between a base station and terminals within a building, and comprises: a first antenna; a second antenna; a first internal signal path connected to the first antenna and including a forward signal path that processes a first forward signal received by the first antenna and a reverse signal path that processes a reverse signal from the terminals toward the base station; and a second internal signal path connected to the second antenna and processing a second forward signal received by the second antenna.

[0008] The above repeater further includes a control module, and the first internal signal path may include: a first balance adjustment unit that adjusts the magnitude of the first forward signal according to the control of the control module; a first frequency converter connected to the output terminal of the first balance adjustment unit and converting the frequency of the first forward signal or the reverse signal to a preset intermediate frequency; and a first detection unit connected to the output terminal of the first frequency converter and detecting the magnitude of the first forward signal converted to the intermediate frequency.

[0009] The first frequency converter may include: a first switch that receives the first forward signal or the reverse signal according to a first switch control signal; a frequency conversion circuit that converts the frequency of the first forward signal or reverse signal input by the first switch to an intermediate frequency; and a second switch that outputs the first forward signal or reverse signal converted to an intermediate frequency according to a second switch control signal.

[0010] The above reverse signal path includes a signal input section and a signal amplifier section, wherein the first terminal of the first switch is connected to the output terminal of the first balance adjustment section, the second terminal of the first switch is connected to the output terminal of the signal input section, the first terminal of the second switch is connected to the input terminal of the first detection section, and the second terminal of the second switch can be connected to the input terminal of the signal amplifier section.

[0011] The control module may generate a first switch control signal and a second switch control signal to convert the first forward signal to an intermediate frequency according to a preset synchronization signal, wherein the first switch is connected to a first terminal according to the first switch control signal and the second switch is connected to a first terminal according to the second switch control signal, and may generate a first switch control signal and a second switch control signal to convert the reverse signal to an intermediate frequency according to a preset synchronization signal, wherein the first switch is connected to a second terminal according to the first switch control signal and the second switch is connected to a second terminal according to the second switch control signal.

[0012] The second internal signal path may include: a second balance adjustment unit that adjusts the magnitude of the second forward signal according to the control of the control module; a second frequency converter connected to the output terminal of the second balance adjustment unit and converting the frequency of the second forward signal to a preset intermediate frequency; and a second detection unit connected to the output terminal of the second frequency converter and detecting the magnitude of the second forward signal converted to the intermediate frequency.

[0013] The control module above can generate one or more of a first signal control signal and a second signal control signal based on the magnitude of a first forward signal detected by the first detection unit and the magnitude of a second forward signal detected by the second detection unit.

[0014] The second balance adjustment unit may include a phase shifter that shifts the phase of the second forward signal to be 90 degrees different from the phase of the first forward signal.

[0015] The phase shifter may be configured to be activated or deactivated depending on whether the first antenna and the second antenna can be positioned such that there is a 90-degree phase difference between the signals received by the first antenna and the second antenna.

[0016] The second balance adjustment unit further includes a bypass switch in which a first terminal is connected to the input terminal of the phase shifter and a second terminal is connected to the output terminal of the phase shifter, and the control module can generate an activation control signal to the bypass switch according to an input activation signal or deactivation signal so that the bypass switch is connected to the first terminal or the second terminal.

[0017] According to the disclosed embodiment, the repeater can support MIMO in the forward link, thereby improving the data throughput of the forward link. In addition, by maintaining a balance between the first forward signal and the second forward signal while creating a 90-degree phase difference, it is possible to achieve a certain level of radio wave quality while implementing MIMO.

[0018] Figure 1 is a schematic diagram showing a conventional in-building RF repeater.

[0019] FIG. 2 is a schematic diagram showing an in-building communication state through a 5G RF MIMO repeater according to one embodiment of the present invention.

[0020] FIG. 3 is a block diagram showing the configuration of a 5G RF MIMO repeater according to one embodiment of the present invention.

[0021] FIG. 4 is a drawing showing another embodiment of the second balance adjustment unit in the present invention.

[0022] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to facilitate a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, this is merely illustrative and the present invention is not limited thereto.

[0023] In describing the embodiments of the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Terms used in the detailed description are intended merely to describe the embodiments of the present invention and should not be limiting in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as "include" or "comprise" are intended to refer to certain characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof other than those described.

[0024] In the following description, terms such as "transmission," "communication," "transmission," "reception," and other terms of similar meaning regarding signals or information include not only the direct transfer of signals or information from one component to another but also the transfer through other components. In particular, "transmission" or "transmitting" a signal or information to one component refers to the final destination of the signal or information and does not mean a direct destination. The same applies to the "reception" of signals or information. Furthermore, in this specification, two or more data or information are "related" means that if one data (or information) is obtained, at least a portion of another data (or information) can be obtained based thereon.

[0025] Additionally, terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0026] FIG. 2 is a schematic diagram showing an in-building communication state through a 5G RF MIMO repeater according to one embodiment of the present invention, and FIG. 3 is a block diagram showing the configuration of a 5G RF MIMO repeater according to one embodiment of the present invention.

[0027] Referring to FIGS. 2 and 3, the repeater (100) is connected to the base station (60) and can serve to relay communication between the base station (60) and terminals within the building. The repeater (100) can be installed in the building. The base station (60) performs communication using the MIMO (Multi Input Multi Output) method. FIG. 2 illustrates the base station (60) operating as 2T2R (two transmitters and two receivers) as an example, but it is not limited thereto.

[0028] In one embodiment, the repeater (100) can perform communication in a Multi Input Multi Output (MIMO) manner on the forward link (or down link) and the reverse link (or up link), respectively.

[0029] In one embodiment, the repeater (100) may include a first antenna (102) and a second antenna (104). The first antenna (102) and the second antenna (104) may each communicate with a base station (60). At the base station (60), the first antenna (102) and the second antenna (104) may be installed spaced apart from each other. In one embodiment, the first antenna (102) and the second antenna (104) may each receive a forward link signal (hereinafter referred to as a forward signal) from the base station (60). The forward signal received by the first antenna (102) may be referred to as a first forward signal, and the forward signal received by the second antenna (104) may be referred to as a second forward signal. The first antenna (102) may transmit a reverse link signal (hereinafter referred to as a reverse signal) to the base station (60).

[0030] In this case, data throughput can be improved by performing MIMO communication in the forward link. That is, when transmitting a signal from the base station (60) to each terminal inside the building, the signal can be transmitted in a MIMO manner at the repeater (100) to improve data throughput. In addition, since data throughput is not a sensitive matter for the reverse link, the signal can be transmitted in a SISO (Single Input Single Output) manner so that the internal structure of the repeater (100) does not become complex.

[0031] Accordingly, the repeater (100) may be configured such that a first internal signal path (106) and a second internal signal path (108) are formed internally as shown in FIG. 3. The first internal signal path (106) may include a forward signal path (106-1) and a reverse signal path (106-2). The second internal signal path (108) may include only a forward signal path. Additionally, the repeater (100) may include a control module (110). The control module (110) may play a role in controlling the overall operation of the repeater (100).

[0032] The repeater (100) may include a first input / output terminal (111), a second input / output terminal (113), a first signal separation unit (115), and a second signal separation unit (117). The first input / output terminal (111) may be an input / output terminal for communication between the repeater (100) and the base station (60). The first input / output terminal (111) may include a first-1 input / output terminal (111-1) and a first-2 input / output terminal (111-2). The first-1 input / output terminal (111-1) may be connected to a first antenna (102). The first-2 input / output terminal (111-2) may be connected to a second antenna (104). The first signal separation unit (115) may serve to separate a first forward signal and a reverse signal from each other at the first-1 input / output terminal (111-1).

[0033] The second input / output unit (113) may be an input / output unit for communication between the repeater (100) and a terminal (not shown) within the building. The second input / output unit (113) may include a second-1 input / output unit (113-1) and a second-2 input / output unit (113-2). The second signal separation unit (117) may serve to separate the first forward signal and the reverse signal from each other at the second input / output unit (113).

[0034] The first internal signal path (106) may be provided between the first-1 input / output terminal (111-1) and the second-1 input / output terminal (113-1) within the repeater (100). The forward signal path (106-1) of the first internal signal path (106) may include a first balance control unit (121), a first frequency converter (123), and a first detection unit (125).

[0035] The first balance control unit (121) can adjust the magnitude of the first forward signal according to the control of the control module (110) of the repeater (100). The first balance control unit (121) may include a switch (121a) and a first signal control unit (121b). In addition, the first balance control unit (121) may further include one or more amplifiers and filters. The switch (121a) may be switched to receive the forward signal output from the first signal separation unit (115) according to a switch control signal. The switch control signal may be generated by the control module (110). In one embodiment, the switch (121a) may be a Single Pole Double Through (SPDT) switch. The first signal control unit (121b) can adjust the magnitude of the first forward signal passing through the first balance control unit (121) according to the first signal control signal.

[0036] The first frequency converter (123) can convert the frequency of the first forward signal or reverse signal (i.e., RF signal) to a preset intermediate frequency (IF). The first frequency converter (123) may include a first switch (123a), a second switch (123b), and a frequency conversion circuit (123c).

[0037] The first switch (123a) may be provided at the input terminal of the first frequency converter (123). The first switch (123a) may receive a first forward signal or a reverse signal according to the first switch control signal. The first switch (123a) may be a Single Pole Double Through (SPDT) switch. The first switch (123a) may include a first terminal and a second terminal. The first switch (123a) may be connected to the first terminal to receive a first forward signal or connected to the second terminal to receive a reverse signal. The first terminal of the first switch (123a) may be connected to the output terminal of the first balance control unit (121). The second terminal of the first switch (123a) may be connected to the output terminal of the signal input unit (131) of the reverse signal path (106-2).

[0038] The second switch (123b) may be provided at the output terminal of the first frequency converter (123). The second switch (123b) may output a first forward signal or a reverse signal converted to an intermediate frequency according to the second switch control signal. The second switch (123b) may be an SPDT switch. The second switch (123b) may include a first terminal and a second terminal. The second switch (123b) may be connected to the first terminal to output a first forward signal converted to an intermediate frequency, or connected to the second terminal to output a reverse signal converted to an intermediate frequency. The first terminal of the second switch (123b) may be connected to the input terminal of the first detection unit (125). The second terminal of the second switch (123b) may be connected to the input terminal of the signal amplifier (133) of the reverse signal path (106-2). Here, the first switch control signal and the second switch control signal can be generated by the control module (110).

[0039] The frequency conversion circuit (123c) can convert the frequency of an RF signal (a first forward signal or a reverse signal) input by the first switch (123a) to a preset intermediate frequency. The frequency conversion circuit (123c) may include one or more mixers, one or more filters, and one or more amplifiers to convert the first forward signal or the reverse signal to a preset intermediate frequency. The signal (the first forward signal or the reverse signal) converted to an intermediate frequency by the frequency conversion circuit (123c) can be output through the second switch (123b).

[0040] The first detection unit (125) can detect the magnitude of the first forward signal converted to an intermediate frequency output through the second switch (123b). The first detection unit (125) can transmit the magnitude of the first forward signal to the control module (110). The first detection unit (125) can output the first forward signal converted to an intermediate frequency after up-converting it into an RF signal. The first forward signal output from the first detection unit (125) is input to the second signal separation unit (117) and can be transmitted to a terminal inside the building through the second-1 input / output terminal (113-1).

[0041] Among the first internal signal paths, the reverse signal path (106-2) may be provided between the second-1 input / output terminal (113-1) and the first-1 input / output terminal (111-1) within the repeater (100). The reverse signal path (106-2) may include a signal input section (131) and a signal amplifier section (133).

[0042] The signal input unit (131) may be connected to the second signal separation unit (117). The signal input unit (131) may include a switch (131a). In addition, the signal input unit (131) may further include one or more amplifiers and filters. The switch (131a) may be switched to receive a reverse signal output from the second signal separation unit (117) according to a switch control signal. The switch control signal may be generated by a control module (110). The switch (131a) may be an SPDT. The reverse signal output from the signal input unit (131) may be input to the first frequency converter (123) through the second terminal of the first switch (123a). The frequency conversion circuit (123c) of the first frequency converter (123) may convert the reverse signal to an intermediate frequency and output it through the second switch (123b).

[0043] The input terminal of the signal amplifier (133) can be connected to the second switch (123b). The signal amplifier (133) can receive the reverse signal converted to an intermediate frequency output from the second switch (123b). The signal amplifier (133) can output the reverse signal converted to an intermediate frequency after up-converting it into an RF signal. The reverse signal output from the signal amplifier (133) can be transmitted to the base station (60) through the first-1 input / output terminal (111-1).

[0044] The second internal signal path (108) may be provided between the first-2 input / output terminal (111-2) and the second-2 input / output terminal (113-2) within the repeater (100). The second internal signal path (108) may include a second balance control unit (141), a second frequency converter (143), and a second detection unit (145).

[0045] The first-2 input / output terminal (111-2) can receive a second forward signal from the second antenna (104). The second balance adjustment unit (141) can be connected to the first-2 input / output terminal (111-2). The second balance adjustment unit (141) can receive a second forward signal output from the first-2 input / output terminal (111-2). The second balance adjustment unit (141) can adjust the magnitude of the second forward signal according to the control of the control module (110). Additionally, the second balance adjustment unit (141) can shift the phase of the second forward signal. In one embodiment, the second balance adjustment unit (141) can shift the phase of the second forward signal so that it differs by 90 degrees from the phase of the first forward signal.

[0046] The second balance control unit (141) may include a phase shifter (141a) and a second signal control unit (141b). In addition, the second balance control unit (141) may further include one or more amplifiers and filters.

[0047] The phase shifter (141a) can be configured to shift the phase of the second forward signal to a 90-degree difference from the phase of the first forward signal. By doing so, interference between the first forward signal and the second forward signal can be prevented.

[0048] Here, it has been described that the phase of the second forward signal within the repeater (100) is shifted through the phase shifter (141a), but this is not limited thereto, and the phase shifter (141a) can be deactivated if the first antenna (102) and the second antenna (104) can be positioned so that the phase difference between the signals received by them is 90 degrees. That is, the phase shifter (141a) can be deactivated if the position or direction of the first antenna (102) and the second antenna (104) can be adjusted so that the phase difference between the signals received by the first antenna (102) and the second antenna (104) is 90 degrees.

[0049] The second signal control unit (141b) can adjust the magnitude of the second forward signal passing through the second balance control unit (141) according to the second signal control signal. The second signal control signal may be generated in the control module (110).

[0050] The second frequency converter (143) can convert the frequency of the second forward signal to a preset intermediate frequency. The second frequency converter (143) may include one or more mixers, one or more filters, and one or more amplifiers to convert the frequency of the second forward signal to a preset intermediate frequency.

[0051] The second detector (145) can detect the magnitude of the second forward signal converted to an intermediate frequency output through the second frequency converter (143). The second detector (145) can transmit the magnitude of the second forward signal to the control module (110). The second detector (145) can output the second forward signal converted to an intermediate frequency after up-converting it into an RF signal. The second forward signal output from the second detector (145) can be transmitted to a terminal inside the building through the second-2 input / output terminal (113-2).

[0052] The control module (110) can control the overall operation of the repeater (100). Specifically, the control module (110) can generate one or more of a first signal control signal and a second signal control signal based on the magnitude of a first forward signal detected by a first detector (125) and the magnitude of a second forward signal detected by a second detector (145). In one embodiment, the control module (110) can generate one or more of a first signal control signal and a second signal control signal such that the magnitude difference between the first forward signal and the second forward signal is within 2 dB.

[0053] The control module (110) can generate a first switch control signal and a second switch control signal, respectively, according to a preset synchronization signal.

[0054] Specifically, the control module (110) can generate a first switch control signal and a second switch control signal to convert a first forward signal to an intermediate frequency in the first frequency converter (123). At this time, according to the first switch control signal, the first switch (123a) can be connected to the first terminal to receive the first forward signal. Additionally, according to the second switch control signal, the second switch (123b) can be connected to the first terminal to output the first forward signal converted to an intermediate frequency.

[0055] Additionally, the control module (110) can generate a first switch control signal and a second switch control signal to convert the reverse signal to an intermediate frequency in the first frequency converter (123). At this time, according to the first switch control signal, the first switch (123a) can be connected to the second terminal to receive the reverse signal. Additionally, according to the second switch control signal, the second switch (123b) can be connected to the second terminal to output the reverse signal converted to an intermediate frequency.

[0056] The control module (110) can activate or deactivate the phase shifter (141a) by generating an activation control signal according to the user's input. This will be explained in detail with reference to FIG. 4.

[0057] FIG. 4 is a drawing showing another embodiment of the second balance adjustment unit (141) in the present invention. Referring to FIG. 4, the second balance adjustment unit (141) may further include a bypass switch (141c) in addition to the phase shifter (141a) and the second signal adjustment unit (141b). The bypass switch (141c) may be configured so that the second forward signal bypasses the phase shifter (141a) according to an activation control signal input from the control module (110).

[0058] The bypass switch (141c) may include a first terminal and a second terminal. The first terminal is connected to the input terminal of the phase shifter (141a), and the second terminal can bypass the phase shifter (141a) and be connected to the output terminal of the phase shifter (141a).

[0059] For example, when a user installs a repeater (100), if the first antenna (102) and the second antenna (104) can be positioned so that the phase difference between the received signals is 90 degrees, a deactivation signal can be input to the control module (110). Then, the control module (110) can generate an activation control signal to connect the bypass switch (141c) to the second terminal. In this case, the second forward signal (which has a 90-degree phase difference from the first forward signal at the antenna terminal) bypasses the phase shifter (141a).

[0060] On the other hand, when a user installs the repeater (100), if it is not possible to arrange the first antenna (102) and the second antenna (104) so ​​that the phase difference between the received signals is 90 degrees, an activation signal can be input to the control module (110). Then, the control module (110) can generate an activation control signal to connect the bypass switch (141c) to the first terminal. In this case, the second forward signal passes through the phase shifter (141a) and the phase is shifted by 90 degrees.

[0061] Meanwhile, although an embodiment in which a bypass switch (141c) is included in the second balance adjustment unit (141) has been described here, it is not limited thereto, and the phase shifter (141a) may be activated or deactivated by adjusting the phase shift function of the phase shifter (141a) itself. Here, activating the phase shifter (141a) may mean adjusting the phase shifted by the phase shifter (141a) so that it becomes 90 degrees. In this case, the phase shifter (141a) can shift the phase of the input signal (i.e., the second forward signal) by 90 degrees. Also, deactivating the phase shifter (141a) may mean adjusting the phase shifted by the phase shifter (141a) so that it becomes 0 degrees. In this case, the phase shifter (141a) can output the input signal as is without phase change.

[0062] That is, in the disclosed embodiment, deactivating the phase shifter (141a) may include not only the case where the input signal bypasses the phase shifter (141a) as shown in FIG. 4, but also the case where the input signal passes through the phase shifter (141a) but is output without phase change.

[0063] Additionally, the control module (110) can operate the repeater (100) in sleep mode according to a signal input to the repeater (100). In one embodiment, the control module (110) can activate the sleep mode when the magnitude of the forward signal detected by the first detection unit (125) or the second detection unit (145) is below a preset threshold for a certain period of time. At this time, the control module (110) can operate the repeater (100) in sleep mode for a preset period of time.

[0064] In sleep mode, the repeater (100) switches to a standby state and receives a signal from the base station (60) but does not output it to a terminal within the building. This allows the power consumed by the repeater (100) to be minimized. This sleep mode may be performed only during a preset time (e.g., night or early morning hours). The control module (110) may release the sleep mode when the signal input to the repeater (100) exceeds a preset threshold, thereby allowing the repeater (100) to operate in normal mode.

[0065] According to the disclosed embodiment, the repeater (100) can support MIMO in the forward link, thereby improving the data throughput of the forward link. In addition, by maintaining a balance between the first forward signal and the second forward signal while creating a 90-degree phase difference, it is possible to implement MIMO while achieving a certain level of radio wave quality.

[0066] In this specification, the term "module" may refer to a functional and structural combination of hardware for carrying out the technical concept of the present invention and software for driving said hardware. For example, the "module" may refer to a logical unit of a specific code and a hardware resource for executing said code, and does not necessarily refer to physically connected code or a single type of hardware.

[0067] Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. As a repeater for relaying MIMO (Multi Input Multi Output) communication in the forward link between a base station and terminals within a building, First antenna; Second antenna; A first internal signal path including a forward signal path connected to the first antenna and processing a first forward signal received by the first antenna, and a reverse signal path processing a reverse signal from the terminals toward the base station; and A repeater comprising a second internal signal path connected to the second antenna and processing a second forward signal received by the second antenna.

2. In Claim 1, The above relay further includes a control module, and The above-mentioned first internal signal path is, A first balance adjustment unit that adjusts the magnitude of the first forward signal according to the control of the above control module; A first frequency converter connected to the output terminal of the first balance adjustment unit and converting the frequency of the first forward signal or the reverse signal to a preset intermediate frequency; and A repeater comprising a first detection unit connected to the output terminal of the first frequency converter and detecting the magnitude of the first forward signal converted to the intermediate frequency.

3. In Claim 2, The above first frequency converter is, A first switch that receives the first forward signal or the reverse signal according to the first switch control signal; A frequency conversion circuit that converts the frequency of a first forward signal or a reverse signal input by the first switch to an intermediate frequency; and A repeater comprising a second switch that outputs a first forward signal or a reverse signal converted to an intermediate frequency according to a second switch control signal.

4. In Claim 3, The above reverse signal path includes a signal input section and a signal amplifier section, and The first terminal of the first switch is connected to the output terminal of the first balance adjustment unit, and the second terminal of the first switch is connected to the output terminal of the signal input unit. A repeater in which the first terminal of the second switch is connected to the input terminal of the first detection unit, and the second terminal of the second switch is connected to the input terminal of the signal amplification unit.

5. In Claim 4, The above control module is, A first switch control signal and a second switch control signal are generated to convert the first forward signal to an intermediate frequency according to a pre-set synchronization signal, wherein the first switch is connected to a first terminal according to the first switch control signal and the second switch is connected to a first terminal according to the second switch control signal. A repeater that generates a first switch control signal and a second switch control signal to convert the reverse signal to an intermediate frequency according to a pre-set synchronization signal, wherein the first switch is connected to a second terminal according to the first switch control signal and the second switch is connected to a second terminal according to the second switch control signal.

6. In Claim 2, The above second internal signal path is, A second balance adjustment unit that adjusts the magnitude of the second forward signal according to the control of the above control module; A second frequency converter connected to the output terminal of the second balance adjustment unit and converting the frequency of the second forward signal to a preset intermediate frequency; and A repeater comprising a second detector connected to the output terminal of the second frequency converter and detecting the magnitude of the second forward signal converted to the intermediate frequency.

7. In Claim 6, The above control module is, A repeater that generates one or more of a first signal control signal and a second signal control signal based on the magnitude of a first forward signal detected by the first detection unit and the magnitude of a second forward signal detected by the second detection unit.

8. In Claim 6, The above second balance adjustment unit is, A repeater comprising a phase shifter that shifts the phase of the second forward signal to be 90 degrees different from the phase of the first forward signal.

9. In Claim 8, The above phase shifter is, A repeater configured to be activated or deactivated depending on whether the first antenna and the second antenna can be arranged such that there is a 90-degree phase difference between the signals received by the first antenna and the second antenna.

10. In Claim 9, The above second balance adjustment unit is, It further includes a bypass switch in which the first terminal is connected to the input terminal of the phase shifter and the second terminal is connected to the output terminal of the phase shifter. The above control module is a repeater that generates an activation control signal to the bypass switch according to an input activation signal or deactivation signal, so that the bypass switch is connected to the first terminal or the second terminal.

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