KR102175386B1 - Apparatus and method for half duplex wireless repeaters with wide coverage - Google Patents

Abstract

The present invention relates to a half-duplex wireless relay apparatus and method for wide area service.
A half-duplex wireless relay apparatus for a wide area service according to the present invention includes: a receiving circuit unit for receiving an analog signal through one or more antennas; An AD conversion unit converting the received analog signal into a digital signal; At least one digital communication unit for transmitting and receiving digital signals with at least one external device, respectively; A path setting unit for setting a transmission path for the digital signal converted by the AD conversion unit and the digital signal received through the at least one digital communication unit; A DA conversion unit converting the digital signal output from the path setting unit into an analog signal; And a transmission circuit for transmitting the converted analog signal through the at least one antenna.

Description

{Apparatus and method for half duplex wireless repeaters with wide coverage}

The present invention relates to a half-duplex wireless relay apparatus and method, and more particularly, to a half-duplex wireless relay apparatus and method for relaying communication devices using a half-duplex wireless communication method such as a radio in a wide area.

A wireless relay device is an equipment used to eliminate a shadow area in an area where communication is required, and facilitates communication between a base station and a terminal (mobile station) or between a terminal and a terminal. In recent years, with the development of mobile communication, many relay devices have been developed and used to resolve shadow areas in the mobile communication service area, and the technology has also made remarkable developments.

On the other hand, the traditional wireless communication method, radio, is still used as an essential communication method in various industrial sites. Recently, the importance of the wireless communication auxiliary equipment has been strengthened due to the securing of the national disaster safety communication network and the reinforcement of fire safety standards. . However, the development and use of a relay device for a radio or broadcast service using a half-duplex communication method is relatively weak compared to mobile communication.

Conventional technologies related to the half-duplex wireless relay device include Korean Patent No. 10-1097406 (a wireless relay device and method for single-frequency short communication), and Korean Patent No. 10-1736244 (emergency disaster communication system).

These prior arts implement a half-duplex wireless communication apparatus and method in consideration of the form of using only two antennas. In the case of providing a relay service in a wide area, as shown in FIG. 1, a donor and one or more remote controllers are implemented. (See FIG. 1A) Alternatively, service coverage was extended by connecting the main donor and one or more sub-donors (see FIG. 1B) to each other with cables.

However, since the half-duplex wireless relay device according to the prior art transmits a signal in an analog manner between a donor and one or more remotes, or a main donor and one or more sub-donors, the signal quality (e.g., There is a problem in that smooth communication becomes difficult when the distance increases due to a decrease in signal-to-noise ratio).

On the other hand, in the case of a conventional wireless relay device for mobile communication, although a signal is transmitted in a digital manner, as shown in FIG. 2, a downlink path transmitted from the base station to the terminal and an uplink path transmitted from the terminal to the base station are clearly distinguished. Therefore, there is a problem that it cannot be applied as it is to a half-duplex wireless relay device that must be transmitted through all paths when a signal from an arbitrary radio is received.

Korean Patent Publication No. 10-1097406 Korean Patent Publication No. 10-1736244

The present invention was invented to solve the above-described problems, and an object of the present invention is to provide a half-duplex wireless relay device and method for smoothly relaying communication devices using a half-duplex wireless communication method, such as a walkie-talkie, in a wide area. Is to do.

Another object of the present invention is to provide a half-duplex wireless relay apparatus and method for a wide area service capable of performing long-distance transmission without deteriorating signal quality between half-duplex wireless relay devices interworked with each other.

Another object of the present invention is to efficiently set a transmission path for a radio signal received from an external half-duplex wireless repeater interlocked with a radio signal received through a random antenna among a plurality of antennas, It is to provide a half-duplex wireless relay device and method for a wide area service transmitted to a half-duplex wireless relay device.

For the above purposes, a half-duplex wireless relay apparatus for a wide area service according to an aspect of the present invention includes: a receiving circuit unit for receiving an analog signal through one or more antennas; An AD conversion unit converting the received analog signal into a digital signal; At least one digital communication unit for transmitting and receiving digital signals with at least one external device, respectively; A path setting unit for setting a transmission path for the digital signal converted by the AD conversion unit and the digital signal received through the at least one digital communication unit; A DA conversion unit converting the digital signal output from the path setting unit into an analog signal; And a transmission circuit for transmitting the converted analog signal through the at least one antenna.

Preferably, the path setting unit transmits the digital signal converted by the AD conversion unit to the at least one digital communication unit and the DA conversion unit, and converts the digital signal received through any digital communication unit among the at least one digital communication unit to the remaining digital. It transmits to the communication unit and the DA conversion unit.

Meanwhile, a half-duplex wireless relay method for a wide area service according to an embodiment of the present invention includes a digital signal converted from an analog signal received through an arbitrary antenna and at least one digital signal received from at least one external device through at least one digital communication unit, respectively. Receiving a digital signal; Establishing a transmission path for the converted digital signal and the received one or more digital signals; And transmitting the digital signal output according to the set transmission path to the at least one external device.

Preferably, the transmission path is set so that one digital signal including a radio signal is selected from among the converted digital signal and the received one or more digital signals and output to all paths. Alternatively, the transmission path is, for any external device among the one or more external devices, the digital signal received from the other external devices excluding the digital signal received from the optional external device and the converted digital signal are summed and output It is set to be possible.

According to the present invention, since radio signals are transmitted through a digital signal transmission method between half-duplex wireless repeaters that are interworked with each other, long-distance transmission can be efficiently performed without deteriorating signal quality.

In addition, according to the present invention, an actual radio signal is included for each digital signal received from one or more external half-duplex wireless relay devices that are interworked with the digital signal converted from an analog signal received through an arbitrary antenna among a plurality of antennas. It has the effect of providing a smooth wide area relay service by outputting the digital signal through all paths.

1 is a diagram illustrating providing a wide area service by using a half-duplex wireless relay device according to the prior art.
FIG. 2 is a diagram illustrating providing a wide area service using a wireless relay device for mobile communication according to the prior art.
3 shows the provision of a wide area service using a half-duplex wireless relay device according to the present invention.
4 is a block diagram of a half-duplex wireless relay apparatus for a wide area service according to a first embodiment of the present invention.
5 illustrates various configurations of an antenna switching unit according to the present invention.
6 illustrates various configurations of a receiving circuit unit according to the present invention.
7 illustrates various configurations of an AD conversion unit according to the present invention.
8 illustrates various configurations of a signal detection unit according to the present invention.
9 is a configuration diagram of a path setting unit according to an embodiment of the present invention.
10 is a block diagram of a half-duplex wireless relay apparatus for a wide area service according to a second embodiment of the present invention.
11 is a configuration diagram of a route setting unit according to another embodiment of the present invention.
12 is a diagram illustrating a state in which half-duplex wireless relay devices for a wide area service according to the present invention interwork with each other to relay a radio signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, detailed descriptions of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted in the following description.

As described above, when the service coverage is extended by interworking half-duplex wireless repeaters according to the prior art (see Fig. 1), signal quality decreases due to attenuation of the signal strength according to the transmission distance. There was a problem that communication became difficult. In addition, since the half-duplex wireless repeater according to the prior art considers a form using only two antennas, a limitation that cannot be applied to the half-duplex wireless repeater according to the present invention, which may have three or more antennas, as described below. There is.

On the other hand, in the case of the existing wireless relay device for mobile communication, since the downlink path transmitted from the base station to the terminal and the uplink path transmitted from the terminal to the base station are clearly separated (see Fig. 2), when a signal from an arbitrary radio is received, all There is a problem that cannot be applied as it is to a half-duplex wireless relay device that must be transmitted through a path. For example, as shown in FIG. 3, in the case of a half-duplex wireless repeater, when a random radio transmits a signal, the half-duplex wireless repeater receiving the signal transmits a corresponding radio signal through the remaining antennas except for the antenna currently receiving the radio signal. The radio signal must be transmitted to an external half-duplex wireless repeater that is interworked with each other, and the existing wireless repeater for mobile communication has a structure that transmits and receives signals only in a predetermined direction, so it can be applied to a half-duplex wireless repeater. none.

Hereinafter, a half-duplex wireless relay apparatus and method for a wide area service according to the present invention will be described in detail with reference to FIGS. 4 to 12.

First, FIG. 4 is a block diagram of a half-duplex wireless relay apparatus for a wide area service according to a first embodiment of the present invention.

4, the half-duplex wireless relay device 100 for a wide area service according to the first embodiment of the present invention includes an antenna switching unit 110, a receiving circuit unit 120, an AD conversion unit 130, and a signal detection unit. 140, a control unit 150, a path setting unit 160, one or more digital communication units 170-1 to 170-N, a DA conversion unit 180, a transmission circuit unit 190, and the like.

The antenna switching unit 110 is connected to one or more antennas 110-1 to 110-M, and under the control of the control unit 150, a transmission path or reception for one or more antennas 110-1 to 110-M, respectively Set the path. For example, the antenna switching unit 110 is composed of one or more switches to connect all or some of the one or more antennas 110-1 to 110-M to the reception circuit unit 120 under the control of the controller 150, or Likewise, all or some of the one or more antennas 110-1 to 110 -M are connected or cut off with the transmission circuit unit 190.

In this regard, Figure 5 illustrates various configurations of the antenna switching unit according to the present invention. As shown in Fig. 5a, the antenna switching unit 110 controls the control unit 150 using a single pole double throw (SPDT) switch for one or more antennas 110-1 to 110-M, respectively. It may be implemented to be selectively connected to the reception circuit unit 120 or the transmission circuit unit 190 according to the configuration. Alternatively, as shown in FIG. 5B, the antenna switching unit 110 includes a single pole double throw (SPDT) switch and impedance matching elements z ₀ , z each consisting of multiple stages for one or more antennas 110-1 to 110-M. It may be implemented to be selectively connected to the reception circuit unit 120 or the transmission circuit unit 190 according to the control of the controller 150 using ₁ ).

The reception circuit unit 120 removes components unnecessary for AD (Analog to Digital) conversion of the signal transmitted from the antenna conversion unit 110 and amplifies the signal to a size suitable for AD conversion. For example, the receiving circuit unit 120 is composed of a band pass filter (BPF), a low noise amplifier (LNA), a variable gain amplifier (VGA), etc., and the antenna switching unit 110 By passing (filtering) only a preset band (for example, a 40MHz band of 420MHz ~ 460MHz) for the analog signal transmitted from the signal, unnecessary components for AD conversion are removed and amplified to an appropriate size for AD conversion. In addition, the receiving circuit unit 120 amplifies the filtered analog signal to an intermediate frequency (IF) or a baseband to an appropriate size for AD conversion, if necessary.

In this regard, Fig. 6 illustrates various configurations of a receiving circuit unit according to the present invention. As shown in FIG. 6A, the receiving circuit unit 120 filters high-frequency bands, low-noise amplification, frequency modulation, intermediate frequency band filtering, and variable gain amplification for analog signals input from the antenna switching unit 110 through one or more paths, respectively. It can be implemented to do the same. And, as shown in FIG. 6B, the receiving circuit unit 120 first combines the analog signals input through one or more paths from the antenna switching unit 110, and then high-frequency band filtering, low noise amplification, frequency modulation, intermediate frequency band filtering, It may be implemented to perform variable gain amplification, etc. in one path, or as shown in FIG. 6C, the receiving circuit unit 120 is a high frequency for each analog signal input through one or more paths from the antenna switching unit 110. Band filtering, low noise amplification, frequency modulation to different frequencies, intermediate frequency band filtering, and the like may be performed and then combined to perform variable gain amplification. In addition, as shown in Figure 6d, the receiving circuit unit 120, compared to the case of Figure 6c, for the first path, a signal that combines analog signals input through one or more paths from the antenna switching unit 110 is input It may be implemented as possible.

The AD conversion unit 130 converts an analog signal output from the reception circuit unit 120 into a digital signal. For example, the AD conversion unit 130 is composed of an AD converter (ADC) including a sampler, a quantizer, etc., and the analog signal transmitted from the receiving circuit unit 120 is A digital signal is generated by sampling and quantizing while maintaining the phase and amplitude. In addition, the AD conversion unit 130 uses a digital down converter (DDC) to convert the center frequency to the base band when the frequency bandwidth of the input signal is narrower than the sampled frequency and the center frequency is far from the base band. Transition and lower the sampling frequency to reduce the amount of transmitted data.

In this regard, Figure 7 illustrates various configurations of the AD conversion unit according to the present invention. As shown in Fig. 7A, the AD conversion unit 130 converts analog signals inputted from the receiving circuit unit 120 (see Fig. 6A) through one or more paths into digital signals, and then combines them and, if necessary, It can be implemented to digitally down convert. And, as shown in Fig. 7b, the AD conversion unit 130 converts the analog signal inputted through one path from the receiving circuit unit 120 (see Figs. 6b and 6c) into a digital signal, It may be implemented to down-convert. In addition, as shown in Fig. 7c, the AD conversion unit 130 converts the analog signal input through one path from the receiving circuit unit 120 (see Fig. 6d) into a digital signal, and then converts the first and second digital signals. It can also be implemented to digitally down-convert in different ways through a down-converter. In this case, the first digital down converter (transmitted to the path setting unit) always selects a frequency band corresponding to the sum of all inputs, and the second digital down converter (transmitted to the signal detection unit) detects a signal while changing the frequency band. You can do it.

The signal detection unit 140 determines whether there is a signal (radio signal) to be relayed from the digital signal output from the AD conversion unit 130 and transmits the result (signal detection information) to the control unit 150. And, depending on the implementation, the signal detection information is transmitted to the path setting unit 160 together with the control unit 150. For reference, the signal detection unit 140 may be implemented to detect whether there is a signal to be relayed using the analog signal output from the reception circuit unit 120, but in this embodiment including the AD conversion unit 130 It is desirable to detect the presence of a radio signal by using a digital signal.

In this regard, FIG. 8 illustrates various configurations of the signal detection unit according to the present invention. As shown in Figure 8a, the signal detection unit 140 is composed of a magnitude calculator (magnitude calculator) and a comparator (comparator) to calculate the size of the sample for the digital signal output from the AD conversion unit 130 It may be implemented to determine that a radio signal has been detected when it is greater than a threshold value compared with a preset threshold value. Alternatively, as shown in FIG. 8B, the signal detection unit 140 divides and filters the digital signal output from the AD conversion unit 130 into a plurality of (K) narrowband filters, and filters the digital signals output from the AD conversion unit 130. After calculating the size of the sample, it compares it with a preset threshold and transmits the result (detection result) to the judging device.If the judging machine determines that any one of the detection results of multiple (K) comparators is present, the radio signal is generated. It can be implemented to determine that it has been detected.

The control unit 150 determines the presence or absence of a radio signal based on the signal detection information transmitted from the signal detection unit 140, and if there is a radio signal, the controller 150 sets a reception path for the antenna currently receiving the radio signal, and The antenna switching unit 110 is controlled to set a transmission path for the other antennas.

For example, the control unit 150 controls the antenna switching unit 110 so that the plurality of antennas 110-1 to 110 -M are sequentially connected to the receiving circuit unit 120 in the standby state, and then the signal detection unit 140 If the radio signal is detected from the signal detection information of ), the current connection state of the antenna switching unit 110 is maintained as it is, so that the radio signal is continuously received through the antenna connected to the current receiving circuit unit 120 and transmitted through the remaining antenna. Control. Alternatively, the control unit 150 controls the antenna switching unit 110 so that all antennas 110-1 to 110-M are connected to the reception circuit unit 120 in the standby state, and the signal from the signal detection unit 140 When radio signal detection is confirmed from the detection information, the antenna switching unit 110 is controlled so that a plurality of antennas 110-1 to 110-M are sequentially connected to the receiving circuit unit 120 to detect the antenna currently receiving the signal. And, when the reception of a certain antenna is detected, the connection state is maintained as it is, so that the radio signal is continuously received through the antenna connected to the current receiving circuit unit 120 and transmitted through the remaining antennas.

In addition, the control unit 150 transmits the signal detection information transmitted from the signal detection unit 140 to the path setting unit 160, and, if there is a radio signal, transmits the currently received radio signal to an external half-duplex wireless relay device. The path setting unit 160 is controlled so as to be performed. For reference, if the signal detection information is directly transmitted from the signal detection unit 140 to the path setting unit 160, the control unit 150 does not need to transmit the signal detection information to the path setting unit 160.

On the other hand, the control unit 150, when notified of the external reception information from the path setting unit 160, etc., the antenna switching unit 110 so that all of the plurality of antennas (110-1 to 110-M) are connected to the transmission circuit unit 190 To control, so that the radio signal transmitted from the external half-duplex wireless repeater is transmitted through all antennas.

The path setting unit 160 sets a transmission path for a digital signal input from the AD conversion unit 130 and a digital signal input from one or more digital communication units 170-1 to 170-N, respectively, and the DA conversion unit 180 ) And one or more digital communication units 170-1 to 170-N.

In this regard, FIG. 9 is a configuration diagram of a path setting unit according to an embodiment of the present invention. 4 and 9, the path setting unit 160 according to an embodiment of the present invention includes a path selector 162, a multiplexer 164, an information distributor 166, and the like, and the AD conversion unit 130 ) And digital signals (p ₁ to p _N ) from one or more digital communication units (170-1 to 170-N), and these digital signals (x, p ₁ to p _N) ) To output a digital signal y to the DA conversion unit 180, and output digital signals q ₁ to q _N , respectively, to one or more digital communication units 170-1 to 170-N.

And, to select a transmission path, the path setting unit 160 according to an embodiment of the present invention receives signal detection information (d) from the signal detection unit 140 or the control unit 150, and also at least one digital communication unit ( 170-1 ~ 170-N) receive the reception status information (b ₁ ~ b _N ). For reference, the signal detection information (d) may be set to L(0) when it is not detected as H(1) when a radio signal is detected. Likewise, the reception status information (b ₁ ~ b _N ) is If the signal is currently being received from the half-duplex wireless relay device of the H(1), it may be set to L(0).

The path selector 162 includes signal detection information (d) input from the signal detection unit 140 or the control unit 150 and reception status information (b ₁ ~) input from one or more digital communication units (170-1 to 170-N). Based on b _N ), the path through which the current radio signal is actually input is determined, and the multiplexer 164 is controlled accordingly. Then, the multiplexer 164, under the control of the path selector 162, the digital signal (x) input from the AD conversion unit 130 and one or more digital communication units (170-1 to 170-N) respectively One of the signals p ₁ to p _N is selected and output to the DA conversion unit 180 and one or more digital communication units 170-1 to 170-N.

On the other hand, the path selector 162 is based on the reception status information (b ₁ ~ b _N ) input from one or more digital communication units (170-1 ~ 170-N), the current digital signal (radio signal ) Is being received, and the result, that is, external reception information (a) is transmitted to the control unit 150. For reference, the external reception information (a) is, for example, when at least one of the reception status information (b ₁ ~ b _N ) is H (1) (that is, when receiving a digital signal from at least one external half-duplex wireless relay device ) H(1), when all of the reception status information b ₁ to b _N are L(0), it may be set to L(0).

The information distributor 166 includes signal detection information (d) input from the signal detection unit 140 or the control unit 150 and reception status information (b ₁ ~) input from one or more digital communication units (170-1 ~ 170-N). b _N ) The signal transmission information (c ₁ to c) informing whether the signal is transmitted to one or more digital communication units (170-1 to 170-N) is determined based on the path through which the current radio signal is actually input, and correspondingly _N ) is transmitted. For reference, the signal transmission information (c ₁ ~ c _N ) is, for example, if you need to transmit a digital signal (radio signal) to an external half-duplex wireless relay device that communicates with the corresponding digital communication unit (170-1 ~ 170-N) H ( If not transmitted to 1), it can be set to L(0).

The operation of the path setting unit 160 according to an embodiment of the present invention described above will be described by taking a specific situation as an example.

First, if a radio signal is being received through an arbitrary antenna 110-m (where m is a value of 1 to M) among one or more antennas 110-1 to 110-M (e.g., signal detection When the information (d) is H (1) and the reception status information (b ₁ to b _N ) is all L (0)), the path selector 162 is a digital signal (x) input from the AD conversion unit 130 Select and control the multiplexer 164 to output to the DA conversion unit 180 and one or more digital communication units 170-1 to 170-N, and the control unit 150 can receive a current signal from an external half-duplex wireless relay device. It is notified that there is no (e.g., external received information (a) is output to L(0)). In addition, the information distributor 166 notifies all digital communication units 170-1 to 170-N to transmit signals to an external half-duplex wireless relay device (e.g., all signal transmission information (c ₁ to c _N )). Output to H(1)).

If a digital signal is being received through a digital communication unit 170-n (here, n is a value from 1 to N) among one or more digital communication units 170-1 to 170-N (e.g., an arbitrary Only the reception status information (b _n ) transmitted from the digital communication unit 170-n is H(1), and the remaining reception status information (except b _n among b ₁ ~ b _N ) and signal detection information (d) are L ( 0)), the path selector 162 selects the digital signal (p _n ) input from the corresponding digital communication unit 170- _n , and selects the DA conversion unit 180 and one or more digital communication units 170-1 to 170- The multiplexer 164 is controlled to output to N), and the control unit 150 notifies that there is a current signal reception from an external half-duplex wireless relay device (eg, outputs external reception information (a) to H(1)). In addition, the information distributor 166 transmits a signal to an external half-duplex wireless relay device for the remaining digital communication units 170-1 to 170-N except for the corresponding digital communication unit 170-n, except for 170-n. (For example, signal transmission information (remaining from c ₁ to c _N except c _n ) is output to H(1)).

And, if all antennas (110-1 to 110-M) and all digital communication units (170-1 to 170-N) are not receiving radio signals (e.g., signal detection information (d) and all reception status information (b ₁ ~ b _N ) is L(0)), the path selector 162 selects a preset signal or an arbitrary signal by the multiplexer 164, and the DA conversion unit 180 and one or more digital communication units 170 -1 to 170-N), and the control unit 150 notifies that there is no current signal reception from an external half-duplex wireless relay device (eg, outputs external reception information (a) to L(0)). In addition, the information distributor 166 notifies all digital communication units 170-1 to 170-N not to transmit signals to the external half-duplex wireless relay devices, respectively (eg, all signal transmission information (c ₁ to c _N ) Is output as L(0)).

Referring back to FIG. 4, one or more digital communication units 170-1 to 170-N respectively transmit and receive digital signals (radio signals) with an external half-duplex wireless relay device. For example, the digital communication units 170-1 to 170-N receive a digital signal from an external half-duplex wireless relay device and transmit it to the route setting unit 160, and the digital signal output from the route setting unit 160 is transmitted to an external device. Transmit to half-duplex wireless repeater. According to an embodiment of the present invention, the digital communication units 170-1 to 170-N load a framer that creates a data frame including frame synchronization information, and the framed data on an optical cable. Photoelectricity that transmits digital signals using an electro-optical converter that serializes and converts them into optical signals, receives optical signals from an external half-duplex wireless relay device, converts them into electrical signals, and converts serial signals into parallel data. A digital signal can be received using a converter and a deframer that recovers data by extracting synchronization information of a frame.

The DA conversion unit 180 converts the digital signal output from the path setting unit 160 into an analog signal. For example, the DA conversion unit 180 is composed of a digital-analog converter (DAC) including a resistor, an operational amplifier, and the like, and is configured with a digital signal output from the path setting unit 160. Generate the corresponding analog signal. Further, the DA conversion unit 130, if the AD conversion unit 130 performs digital down conversion, first performs digital up conversion using a digital up converter (DUC) and then performs the DA conversion. Perform.

The transmission circuit unit 190 amplifies power after removing unnecessary components from the analog signal output from the DA conversion unit 180 and transmits the amplified power to the antenna conversion unit 190. For example, the transmission circuit unit 190 is composed of a band-pass filter, a power amplifier, etc., and amplifies it into power that can be transmitted by the antenna after removing unnecessary components from the analog signal output from the DA conversion unit 180 Then, it is transmitted to the antenna switching unit 190. In addition, the transmission circuit unit 190, if the frequency is shifted in the reception circuit unit 120 or the output frequency of the DA converter 180 is different from the frequency to be transmitted, the frequency is shifted to the actual transmission frequency.

10 is a block diagram of a half-duplex wireless relay apparatus for a wide area service according to a second embodiment of the present invention.

Referring to FIG. 10, a half-duplex wireless relay apparatus 200 for a wide area service according to a second embodiment of the present invention includes an antenna switching unit 210, a receiving circuit unit 220, an AD converting unit 230, and Second signal selection units 240a and 240b, signal detection unit 240, control unit 250, path setting unit 260, one or more digital communication units 270-1 to 270-N, DA conversion unit 280 , A transmission circuit unit 290, and the like.

The half-duplex wireless relay device 200 for wide area service according to the second embodiment of the present invention selects first and second signals compared to the half-duplex wireless relay device 100 for wide area service according to the first embodiment described above. The differences are shown in that the units 240a and 240b are added and the functions of the control unit 250 and the path setting unit 260 are slightly changed, and the remaining configurations are substantially the same or similar. Therefore, in the following description, the features and differences of the second embodiment compared to the first embodiment will be mainly described, and the remaining contents may be referred to the first embodiment.

In the second embodiment of the present invention, the digital signal output from the AD conversion unit 230 is transmitted to the first signal selection unit 240a and the second signal selection unit 240b. The first signal selection unit 240a selects one of a digital signal output from the AD conversion unit 230 and a no-signal state (e.g., transfers 0 if using the Two's Complement number system) to set the path It passes to the unit 260. For reference, the first signal selection unit 240a can be omitted, but when there is no radio signal reception through the antenna (i.e., when the signal detection unit 240 determines that there is no radio signal), the no-signal state is set as a path. By transferring the noise to the unit 260, noise may be removed, and the quality of the output signal of the path setting unit 260 may be improved.

The path setting unit 260 is configured for digital signals input from the first signal selection unit 240a (or AD conversion unit 230) and digital signals input from one or more digital communication units 270-1 to 270-N, respectively. A transmission path is set and output to the DA conversion unit 280 and one or more digital communication units 270-1 to 270-N.

In this regard, FIG. 11 is a configuration diagram of a path setting unit according to another embodiment of the present invention. 10 and 11, the path setting unit 260 according to another embodiment of the present invention is configured with a plurality of adders, and the first signal selection unit 240a (or the AD conversion unit 230) ) And digital signals (p ₁ to p _N ) from one or more digital communication units (270-1 to 270-N), respectively, and the digital signal (y) to the DA conversion unit (180). ) And also outputs digital signals q ₁ to q _N , respectively, to one or more digital communication units 270-1 to 270-N. In this case, the digital signal y output to the DA conversion unit 280 is from the digital signal x input from the first signal selection unit 240a and one or more digital communication units 270-1 to 270-N, respectively. The input digital signal (p ₁ ~ p _N ) is a combined signal, and the digital signals (q ₁ ~ q _N ) respectively output to the digital communication unit (270-1 ~ 270- _N ) are the corresponding digital communication unit (270-n) ( Here, n is a digital signal input from the digital communication unit (excluding 270-n among 270-1 to 270-N) excluding any value from 1 to N) (excluding p _n among p ₁ to p _N) ) And the digital signal x input from the first signal selection unit 240a are summed. For reference, the output of the route setting unit illustrated in FIG. 11A may be expressed as Equation 1 below, and the output of the route setting unit illustrated in FIG. 11B may be expressed as Equation 2 below.

[Equation 1]

[Equation 2]

Thus, the route setting unit 260 in accordance with another embodiment of the present invention, the digital communication unit (270-n), a signal (q _n) for transmitting to an external half-duplex radio relay apparatus, the signal it receives (p _n By excluding ), divergence, saturation, and oscillation due to infinite feedback can be prevented. In addition, when there is no radio signal reception through the antenna, since the no-signal state is input to the path setting unit 260, even in the case of an external half-duplex wireless relay device, when there is no radio signal, the no-signal state is changed through the responsible digital communication unit. In the end, the signal output from the path setting unit 260 is substantially only one signal having a radio signal, although several signals are combined, and thus, the same result as in the embodiment of FIG. 9 is obtained. Bring.

The second signal selection unit 240b selects one of a digital signal output from the AD conversion unit 230 and a digital signal output from the path setting unit 260 and transmits it to the signal detection unit 240. For example, the second signal selection unit 240b sequentially transmits the output signal of the AD conversion unit 230 and the output signal of the path setting unit 260 to the signal detection unit 240 at a preset period, or the signal detection unit Under the control of (240) or the control unit 250, the output signal of the AD conversion unit 230 and the output signal of the path setting unit 260 are selected and transmitted to the signal detection unit 240. Accordingly, the control unit 250 can know which signal is the result (signal detection information) detected by the signal detection unit 240.

Based on the signal detection information transmitted from the signal detection unit 240, the control unit 250 is substantially a radio signal for the digital signal output from the AD conversion unit 230 and the digital signal output from the path setting unit 260 It is determined whether is included. If a radio signal is included in both the digital signal output from the AD conversion unit 230 and the digital signal output from the path setting unit 260, this is an arbitrary one of one or more antennas 210-1 to 210-M. Since this corresponds to the case of receiving a radio signal through an antenna of, the controller 250 maintains the current connection state of the antenna switching unit 210 as it is, and continues to receive radio signals through an antenna connected to the current receiving circuit unit 220. And control to be transmitted through the remaining antennas. If the digital signal output from the AD conversion unit 230 does not have a radio signal, but the digital signal output from the path setting unit 260 includes a radio signal. This corresponds to a case in which a radio signal is received through any digital communication unit among one or more digital communication units 270-1 to 270-N, so that the control unit 250 has one or more antennas 210-1 to 210-M. By controlling the antenna switching unit 210 so that all of them are connected to the transmission circuit unit 290, the radio signals transmitted from the external half-duplex wireless repeater are transmitted through all antennas. On the other hand, if there is no radio signal in both the digital signal output from the AD conversion unit 230 and the digital signal output from the path setting unit 260, this means that one or more antennas 210-1 to 210-M and one Since all of the digital communication units 270-1 to 270-N are not receiving radio signals, the controller 250 controls the antenna switching unit 210 in the same manner as before.

Finally, FIG. 12 shows a state in which half-duplex wireless relay devices for a wide area service according to the present invention interwork with each other to relay a radio signal. The half-duplex wireless relay devices for wide area service according to the present invention interwork with each other to transmit and receive digital signals in the above-described manner. As shown in FIG. 3, when an arbitrary radio transmits a signal, an antenna currently receiving radio signals It is possible to provide a smooth wide area relay service without deteriorating signal quality by transmitting the radio signal through the remaining antennas except for the radio signal and transmitting the radio signal to all external half-duplex radio relay devices interlocked with each other.

Although the present invention has been described in detail with reference to preferred embodiments so far, those skilled in the art to which the present invention pertains can be implemented in various other specific forms without changing the technical spirit or essential features of the present invention. The embodiments are illustrative in all respects and should be understood as non-limiting.

And, the scope of the present invention is specified by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as.

Claims (11)

delete As a half-duplex wireless relay device for wide area service,
A receiving circuit unit for receiving an analog signal through one or more antennas;
An AD conversion unit converting the received analog signal into a digital signal;
At least one digital communication unit for transmitting and receiving digital signals with at least one external device, respectively;
A path setting unit for setting a transmission path for the digital signal converted by the AD conversion unit and the digital signal received through the at least one digital communication unit;
A DA conversion unit converting the digital signal output from the path setting unit into an analog signal; And
And a transmission circuit for transmitting the converted analog signal through the at least one antenna,
The path setting unit transmits the digital signal converted by the AD conversion unit to the at least one digital communication unit and the DA conversion unit, or transmits a digital signal received through any digital communication unit among the at least one digital communication unit to the remaining digital communication unit and the DA. Half-duplex wireless relay device for a wide area service, characterized in that transmitting to the conversion unit. The method of claim 2,
The path setting unit selects one of a digital signal converted by the AD conversion unit and a digital signal each received through the at least one digital communication unit and transmits the selected digital signal to the at least one digital communication unit and the DA conversion unit. For half-duplex wireless repeater. The method of claim 3,
Further comprising a signal detection unit for generating signal detection information by detecting whether there is a signal to be relayed from the analog signal or the digital signal,
The route setting unit
A multiplexer for selecting and outputting one of the digital signals converted by the AD conversion unit and digital signals respectively received through the at least one digital communication unit; And
And a path selector for controlling the multiplexer based on the signal detection information and reception state information respectively transmitted from the at least one digital communication unit. The method of claim 4,
The path selector transmits external reception information to a control unit based on reception state information respectively transmitted from the at least one digital communication unit. The method of claim 4,
The route setting unit further comprises an information distributor for transmitting signal transmission information to the at least one digital communication unit based on the signal detection information and the reception status information respectively transmitted from the at least one digital communication unit. Half-duplex wireless repeater. The method of claim 2,
And the path setting unit sums the digital signals converted by the AD conversion unit and the digital signals received through the at least one digital communication unit and transmits them to the DA conversion unit. The method of claim 2,
The path setting unit combines the digital signals converted by the AD conversion unit and the digital signals received from the one or more digital communication units except for the arbitrary digital communication unit and transmits the combined digital signals to the arbitrary digital communication unit. For half-duplex wireless repeater. delete As a half-duplex wireless relay method for wide area service,
Receiving a digital signal converted from an analog signal received through an arbitrary antenna and one or more digital signals respectively received from one or more external devices through one or more digital communication units;
Establishing a transmission path for the converted digital signal and the received one or more digital signals; And
Transmitting the digital signal output according to the set transmission path to the at least one external device,
The transmission path is set so that one digital signal including a radio signal from among the converted digital signal and the received one or more digital signals is selected and output through all paths. The method of claim 10,
The transmission path is set to be output by summing the digital signal and the converted digital signal respectively received from other external devices excluding the digital signal received from the arbitrary external device to any external device among the one or more external devices Half-duplex wireless relay method for a wide area service, characterized in that.

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