KR100937221B1 - Two-way repeater and repeating method for radio communication between software defined radio modems of multiband and different types of modulation and communication system using this - Google Patents

Abstract

PURPOSE: A bidirectional repeater, a relay method and a communications system using the same between a modulation type SDR modems performing bidirectional communication among multiband heterogeneous modems are provided to perform bidirectional communication between multi-band different kind modems. CONSTITUTION: A first terminal(100) transmits a first signal. A relay(200) demodulates the first signal. The relay detects the tone signal from the first signal. The relay controls the bidirectional wireless transmission-reception between different kinds of modems. The relay transmits the second signal. A second terminal(300) demodulates the second signal.

Description

Two-way repeater and repeating method for radio communication between Software Defined Radio modems of multiband and different types of modulation and communication system using this}

The present invention relates to a bidirectional repeater and a relay method between a multi-band heterogeneous modulation SDR modem and a communication system using the same. More specifically, the present invention relates to a software defined radio having a heterogeneous modulation in a half-duplex communication system. The present invention relates to a bidirectional repeater and a relay method between a multiband heterogeneous modulation SDR modem capable of bidirectional communication even between multiband heterogeneous modems by automatically relaying voice signals between modems and a communication system using the same.

With the advent of new standards and protocols, new wireless technologies are rapidly developing. The rapid adoption of wireless Internet demands integrated services that can provide additional capabilities, such as seamless global communication and quality of service (QoS) by user coordination, as well as simple connection of wireless internet.

The research issue in connecting complex wireless Internet is whether it is possible to develop more advanced system (or service) technology by reusing wireless hardware or software even when new standards and technologies emerge.

The integrated service concept requires a wireless system (network) that provides two characteristics. The first is global roaming as an example of a multi-mode phone, and the second is an interface with different cellular systems to provide seamless service in a fixed location. In other words, Bluetooth or IEEE 802.11 network is a representative example.

As a result, wireless system manufacturers and service providers must change existing systems to improve their systems. Each time a new technology emerges, a redesign is needed to upgrade the system, and future systems must be future-proof. In other words, it should be a wireless system that can immediately implement any technology and provide better QoS.

In order to successfully communicate between different systems, the radio must decode the device's signals using different air interfaces. Moreover, in order for network protocols, services, and environments to handle changes efficiently, mobile terminals that provide reconfigurable hardware need to provide multiple protocols, such as IP and Mobile Exe cution Environment (MExE).

This radio is based on a system that can communicate and interface between functions, and can be implemented as a software defined radio (SDR) technology using reconfigurable hardware.

The term Software Defined Radio (SDR) was first used by Joe Mitola in 1991, applying a classification of radio that can be reprogrammed or reconfigured. In other words, the same hardware can perform different functions at different times. The SDR Forum is a "combination of software and hardware technologies that allow the system structure of wireless communication to be reconfigured" or "a technology that enables the implementation of a multimode, multiband, and multi-function wireless system by simply upgrading the software without changing hardware (platform). ”.

The exact definition of SDR is still controversial, and no consensus has yet been reached on the degree of reconfiguration needed to define an SDR radio system. Wireless systems with microprocessors or DSP processors need not be defined as SDRs. However, if a wireless system with modulation, error correction, and encryption processing defined as software can control and reprogram RF (Radio Frequency) hardware, it can be called a reliable SDR. A good way to define an SDR is that it is a wireless system where the radio is fully software defined and the physical layer behavior can change significantly through software changes. The degree of reconfiguration is usually determined by the complex interactions between some common issues in wireless design, including system engineering, antenna shape elements, RF devices, baseband processing, speed and reconfiguration of hardware, and power supply management. The term SDR is generally expressed slightly differently in three aspects: signal processing, radio regulation, and 4G mobile communication system.

SDR technology in terms of signal processing reduces the processing of hardware with fixed functions by placing the digital signal processing unit as close to the antenna stage as possible, and extends the programmable hardware part to increase the flexibility of the system using software. Defined as wireless technology. This means replacing the fixed hardware processing of ASICs with programmable hardware such as FPGAs and DSP processors. SDR is a collection of hardware and software technologies that enable a programmable system architecture for wireless communication. This includes antennas, RF, ADCs, DACs, baseband modems, modular software, signal processing algorithms, and hardware or software development tools.

The US FCC defines SDR from a regulatory point of view. That is, to improve the efficiency of finite frequency resources, operating parameters such as frequency, modulation method, and maximum output, which affect radio frequency emission, are defined as a wireless technology that can be adjusted by software change without replacing hardware components. From the perspective of 4G mobile communication systems, the operation mode of various wireless network (ubiquitous network, W-LAN, W-PAN, cellular, digital broadcasting, satellite communication, etc.) components focuses on the direction of 4G system development currently pursued by ITU-R. These are defined as wireless technologies that can be modified by software downloads after system manufacture or to improve performance.

The ideal implementation of SDR requires a fully flexible RF stage to digitize at the antenna, adjusting a wide range of carrier frequencies and modulation types to ensure complete flexibility in the digital domain. However, ideal SDRs are not yet fully exploited in commercial systems due to technical limitations and cost considerations.

More specifically, the conventional general modem relay communication structure and problems are as shown in Figure 1a to 1c.

As shown in FIG. 1A, conventional modem-to-modem communication is only possible for one-to-one communication between modems 10 and 20 using a homogeneous modulation scheme and a homogeneous band. In the relay system using the half duplex communication method as shown in FIG. 1B, the communication between homogeneous modems 10 and 20 is fixed in one direction because the RF relay switch is fixed as set by the user in the repeater 30. There was only an issue relayed.

More specifically, when the modems 10 and 20 and the repeater 30 do not transmit signals, the antenna is basically connected to the receiver RX. In this state, if the ① modem 10 transmits a signal, the transmitter TX and the antenna of the ① modem 10 are connected and the signal is transmitted, and the receiver of the modem ② of the repeater 30 ( RX receives the signal, and then relays the signal by transmitting the signal through the transmitter TX of modem ③. Then, the signal is received through the receiver TX of the modem 20. ) And the communication between the number ④ modem 20 is made.

In this case, in order to transmit a signal through the transmitter TX of the modem ③, the user may set the RF relay switch in advance so that the antenna of the transmitter TX of the modem ③ is connected.

On the contrary, in order to transmit the signal to the modem 10, the ④ modem ④ does not artificially connect the transmitter (TX) and the antenna of the modem ② of the repeater through the RF relay switch. 20) cannot transmit the signal to modem ①.

As described above, in the conventional relay system using the half duplex communication system, the transmission and reception are not automatically switched, but only the one-way communication is possible because the user can transmit only as mummified.

In addition, such a conventional relay communication structure has a problem in that relaying is not possible when the frequency bands used are not the same type of modem as shown in FIG. 1C.

The present invention is to automatically relay the voice signal between the SDR (Software Defined Radio) modem with heterogeneous modulation in a half-duplex communication system using a tone signal that controls the relay switch synthesized in the voice signal in the terminal of the repeater It is an object of the present invention to provide a bidirectional repeater and a relay method between a multiband heterogeneous modulation SDR modem capable of bidirectional communication between multiband heterogeneous modems and a communication system using the same.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An example of a communication system between a multi-band heterogeneous modulation SDR modem according to the present invention is to synthesize a tone signal for controlling a relay between heterogeneous modems in a frequency band other than the voice signal and the voice signal, Receiving a first signal and demodulating the first signal by a demodulation method corresponding to a first type of modulation method, and detecting a tone signal from the demodulated first signal. A repeater for controlling the relay to enable two-way wireless transmission and reception between heterogeneous modems, and transmitting a second signal obtained by modulating the demodulated first signal by a second type of frequency band or a modulation scheme; And a second terminal receiving the second signal from the repeater and demodulating the demodulation scheme corresponding to the second type of modulation scheme.

Here, the repeater receives the first signal from the first terminal and the first signal demodulated by the demodulation method corresponding to the first type of modulation method; and the tone signal from the demodulated first signal to detect the heterogeneous modem A relay control signal for controlling the relay to enable two-way wireless transmission and reception between the first relay receiver for outputting the second signal and a second signal for modulating the demodulated first signal in a frequency band or a modulation scheme of a second type; Relay transmitter; And a second relay switch configured to receive a relay control signal from the first relay receiver to electrically transmit the second signal to the second terminal and electrically connect the second relay transmitter and the antenna.

Here, the first relay receiver receives a first signal and demodulates and outputs a demodulation method corresponding to a first type of modulation scheme; and a demodulated first signal and a tone signal from the first signal. A tone detector for detecting a signal and outputting a relay control signal; And an analog converter which receives the demodulated first signal from the first relay demodulator, converts the first signal into an analog signal, and outputs the analog signal.

The tone detector may include: a low pass filter for receiving a first signal output from the first relay demodulator and filtering a tone signal; and a Fourier transform unit for Fourier transforming the filtered tone signal into tone data in a frequency domain; A comparison unit which obtains a difference value between the tone data and the set value by comparing the preset value with a data value corresponding to the frequency of the tone signal in the data and the repeater; And a control signal output unit configured to output a relay control signal when the difference value is smaller than a preset threshold value.

In addition, the first terminal includes a digital converter for converting a voice signal from an analog signal to a digital signal; A synthesizer for synthesizing the tone signal with the digitally converted voice signal; And a first modulator configured to output a first signal obtained by modulating a voice signal synthesized with a tone signal in a first type of frequency band or a modulation scheme.

Here, the first terminal may further include a tone signal generator for generating a tone signal of a frequency lower than the frequency band of the voice signal and outputting the tone signal to the synthesizer.

In addition, an example of a bidirectional repeater between a multi-band heterogeneous modulation SDR modem according to the present invention synthesizes a tone signal for controlling the relay between heterogeneous modems in a frequency band other than the voice signal and the voice signal from the first terminal and Receiving a first signal modulated by a frequency band or a modulation scheme and demodulating the first signal by a demodulation scheme corresponding to a first type of modulation scheme; and detecting a tone signal from the demodulated first signal to generate a heterogeneous modem. A relay control signal for controlling the relay to enable two-way wireless transmission and reception between the first relay receiver for outputting the second signal and a second signal for modulating the demodulated first signal in a frequency band or a modulation scheme of a second type; Relay transmitter; And a second relay switch configured to receive a relay control signal from the first relay receiver to electrically transmit the second signal to the second terminal and electrically connect the second relay transmitter and the antenna.

Here, the first relay receiver receives a first signal and demodulates and outputs a demodulation method corresponding to a first type of modulation scheme; and a demodulated first signal and a tone signal from the first signal. A tone detector for detecting a signal and outputting a relay control signal; And an analog converter which receives the demodulated first signal from the first relay demodulator, converts the first signal into an analog signal, and outputs the analog signal.

The tone detector may include: a low pass filter for receiving a first signal output from the first relay demodulator and filtering a tone signal; and a Fourier transform unit for Fourier transforming the filtered tone signal into tone data in a frequency domain; A comparison unit obtaining a difference value between the tone data and the set value by comparing the preset value with a data value corresponding to the frequency of the tone signal in the data and the repeater; And a control signal output unit configured to output a relay control signal when the difference value is smaller than a preset threshold value.

In addition, an example of a bidirectional relay method between a multi-band heterogeneous modulation SDR modem according to the present invention synthesizes a tone signal for controlling the relay between heterogeneous modems in a frequency band other than the voice signal and the voice signal from the first terminal and the first type. Receiving a first signal modulated by a frequency band or a modulation scheme of a first signal and demodulating the first signal by a demodulation scheme corresponding to a first type of modulation scheme; and detecting a tone signal from the demodulated first signal. A relay control signal for controlling relaying to enable two-way wireless transmission and reception between modems; a first relay step of outputting; and a first signal demodulated in the first relay step by modulating a second signal in a frequency band or a modulation scheme of a second type. A second relay step of outputting a signal; And a second relay switching step of switching the transmitter and the antenna to be electrically connected to each other in order to receive the relay control signal output in the first relay step and transmit the second signal output in the second relay step to the second terminal. Include.

Here, the first relay step may include a first relay demodulation step of receiving a first signal and demodulating and outputting a demodulation method corresponding to a first type of modulation method; and receiving a demodulated first signal and a tone signal from the first signal. Detecting a tone and outputting a relay control signal; And an analog conversion step of receiving the first signal demodulated in the first relay demodulation step, converting the analog signal into an analog signal and outputting the analog signal.

The tone detection step may include: filtering the tone signal by receiving the first signal output from the first relay demodulation step; and performing Fourier transform of the low-band filtered tone signal into tone data in the frequency domain; Obtaining a difference value between the tone data and the setting value by comparing the preset value with a data value corresponding to the frequency of the tone signal in the repeater; And outputting a relay control signal when the difference value is smaller than a preset threshold value.

The bidirectional repeater and the relay method between the multi-band heterogeneous modulation SDR modem according to the present invention and a communication system using the same are heterogeneous in a half-duplex communication system using a tone signal for controlling a relay switch synthesized with a voice signal at a terminal of the repeater. By automatically relaying voice signals between SDR (Software Defined Radio) modems with modulation schemes, bidirectional communication is possible even between multiband heterogeneous modems.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if shown on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view for explaining an example of a bidirectional relay system between multi-band heterogeneous modulation SDR modem in the present invention.

As shown in FIG. 2, the bidirectional relay system between the multi-band heterogeneous modulation SDR modems includes a first terminal 100, a repeater 200, and a second terminal 300.

The first terminal 100 has a function of synthesizing a tone signal for controlling relay between heterogeneous modems in a frequency band other than the voice signal and the voice signal and transmitting a first signal modulated by a first type frequency band or a modulation scheme. do.

The repeater 200 receives the first signal and demodulates the first signal in a demodulation scheme corresponding to a first type of modulation scheme, and detects a tone signal from the first signal to perform two-way wireless transmission and reception between heterogeneous modems. And control and transmit a second signal obtained by modulating the demodulated first signal in a frequency band or a modulation scheme of a second type.

The second terminal 300 receives the second signal from the repeater 200 and demodulates the demodulation scheme corresponding to the second type of modulation scheme.

As described above, in FIG. 2, a signal transmission from (a) the first terminal 100 to the repeater 200 to the second terminal 300 has been described as an example. In the case of transmitting a signal from the repeater 200 to the first terminal 100, the signal may be transmitted in the same manner. That is, the first terminal 100 and the second terminal 300 do not specify any one terminal, but simply mean terminals having different modulation and demodulation schemes or frequency bands.

3 is a diagram illustrating an example of a transmitter of a terminal in a bidirectional relay system between multi-band heterogeneous modulation SDR modems according to the present invention.

As an example, the transmitting end of the terminal as illustrated in FIG. 3 is included in the first terminal device 100 for convenience of description. However, in the case of transmitting a signal from the second terminal 300 to the first terminal 100, the transmitting terminal as shown in FIG. 3 may be included in the second terminal 300.

As shown, the transmitter included in the first terminal 100 includes a digital converter 110 (ADC), a synthesizer 120 and a first modulator 130 (Modulator), in addition to generating a tone signal The unit 140 may include a ton generator, an up conversion unit 150 (DUC; digital up conversion), an analog conversion unit 160 (DAC), and a communication unit 170 (RF).

The digital converter 110 (ADC) functions to convert a voice signal from an analog signal to a digital signal. Here, the frequency band of the audio signal is approximately 3 KHz.

The tone signal generator 140 generates a tone signal having a frequency lower than that of the voice signal and outputs the tone signal to the synthesizer 120. The tone signal generated by the tone signal generator 140 may be a periodic signal and may be a specific frequency of 120 Hz to 150 Hz in a frequency band lower than that of the voice signal.

 Alternatively, the frequency band of the tone signal may be a higher frequency band than the frequency band of the audio signal. In such a case, the high-pass filter is used in place of the low pass filter as a filter for filtering the tone signal in the tone detector described later.

The synthesizing unit 120 synthesizes and outputs a tone signal to the digitally converted voice signal output from the digital converting unit 110.

The first modulator 130 outputs a first signal obtained by modulating the tone signal and the synthesized voice signal by the synthesizer 120 using a frequency band or a modulation scheme of a first type.

The up-conversion unit 150 functions to up sample the first signal modulated by the first modulator 130.

The analog converter functions to convert the upsampled first signal from a digital signal to an analog signal.

Next, the communication unit 170 transmits the first signal converted into the analog signal by the analog converter through the antenna.

4A is a diagram for explaining an example of a repeater in a bidirectional relay system between multi-band heterogeneous modulation SDR modems according to the present invention.

As shown in Figure 4a, an example of a repeater 200 according to the present invention

A first relay receiver 210, a second relay transmitter 220, and a second relay switch 230; a second relay receiver 240, a first relay transmitter 250, and a first relay switch 260; It may include.

In this case, when the voice signal is transmitted from the first terminal 100 to the second terminal 300, the voice signal is connected to the first relay receiver 210, the second relay transmitter 220, and the second relay switch 230. When the voice signal is relayed through the second terminal 300 and the voice signal is transmitted from the second terminal 300 to the first terminal 100, the voice signal is transmitted to the second relay receiver 240, the first relay transmitter 250, and the first relay switch 260. Is relayed through). In the repeater 200, the first relay receiver 210 is the second relay receiver 240, the second relay transmitter 220 is the first relay transmitter 250, and the second relay switch 230 is the first relay receiver. It has the same structure as the one relay switch 260.

As described above, an example of the repeater 200 according to the present invention has an effect of relaying two-way communication when transmitting and receiving a voice signal between the first terminal 100 and the second terminal 300.

In FIG. 4A, a case of transmitting a signal from the first terminal 100 to the second terminal 300 will be described as an example.

The first relay receiver 210 receives the first signal from the first terminal 100 and demodulates the first signal by demodulating the first signal in a demodulation scheme corresponding to a first type of modulation scheme. And a tone signal from the demodulated first signal to output a relay control signal to the second relay switch 230 to control the relay so as to enable two-way wireless transmission and reception between heterogeneous modems.

As such, the relay control signal output from the first relay receiver 210 is input as a control signal of the second relay switch 230 to electrically connect the second relay transmitter 220 and the antenna.

The second relay transmitter 220 modulates the demodulated first signal in a frequency band or a modulation scheme of a second type to output a second signal and transmit the same through an antenna.

The second relay switch 230 receives a relay control signal from the first relay receiver 210 to transmit the second signal to the second terminal 300 and electrically connects the second relay transmitter 220 to the antenna. Function.

When the relay control signal is not input, the second relay switch 230 is basically set such that the antenna and the second relay receiver 240 are connected to each other. Half duplex may be used as the second relay switch 230 as an example.

4B is a diagram for explaining an example of a receiving end in a bidirectional repeater between multi-band heterogeneous modulation SDR modems as shown in FIG. 4A.

The receiver 200 as shown in FIG. 4B may be included in the first relay receiver 210 or the second relay receiver 240 shown in FIG. 4A.

The repeater 200 receives the communication unit 211 (RF), the digital converter 212 (ADC), the down converting unit 213 (Digital Down Conversion (DDC)), the first relay demodulator 214 (Demodulator) , A tone detector 215 (Tone Detector) and an analog converter 216 (DAC).

In the case of transmitting a voice signal from the first terminal 100 to the second terminal 300, the repeater 200 receiving terminal as shown in FIG. 4B will be described as follows.

First, the communication unit 211 receives a first signal transmitted from the first terminal 100 through an antenna.

The first signal thus received is converted from the analog signal to the digital signal through the digital converter 212.

The down converting unit 213 functions to down sample the first signal converted into the digital signal.

The down-sampled first signal is demodulated and output through a first relay demodulator 214 in a demodulation scheme corresponding to a first type of modulation scheme.

The tone detector 215 receives a demodulated first signal and detects a tone signal from the first signal and outputs the tone signal as a relay control signal for controlling the second relay switch.

The analog converter 216 receives the demodulated first signal from the first relay demodulator 214 and converts the demodulated signal into an analog signal to output an audio signal synthesized with a tone signal. Here, the tone signal of the voice signal synthesized with the tone signal output from the analog converter 216 has no meaning beyond noise.

As described above, the receiver 200 receives the first signal, which is a voice signal synthesized with the tone signal, from the first terminal 100, demodulates the first signal, detects the tone signal from the first signal, and repeats the control signal. And outputs an audio signal synthesized with a tone signal by analog converting the first signal.

The voice signal output from the repeater 200 receiver as described above has a low band frequency characteristic as a voice signal that can be heard by a human ear. Therefore, the above-described second relay receiver 240 may transmit the modulated signal in the second type of frequency band or modulation scheme.

4C is a view for explaining an example of the tone detector in the example of the receiving end as shown in FIG. 4B.

As shown in FIG. 4C, the tone detector 215 includes a low pass filter (LPF, 215a), a Fourier transform (FFT, 215b), a comparator (215c), and a control signal output (Pick detector) 215d. ) May be included.

The low pass filter (LPF) 215a receives a first signal output from the first relay demodulator 214 and filters the tone signal. More specifically, the demodulated first signal is an audio signal synthesized with a tone signal. Since the voice signal is a relatively high frequency signal compared to the tone signal, the low pass filter (LPF) 215a can remove the voice signal and filter only the tone signal. However, as described above, when a high frequency higher than the voice signal frequency band is used as the frequency band of the tone signal, a high pass filter may be used instead of the low pass filter LPF 215a.

The Fourier transform unit (FFT) 215b functions to Fourier transform the low-band filtered tone signal into tone data in the frequency domain. In this way, the Fourier transform unit (FFT) 215b converts the tone signal which is a periodic signal in the time domain into a tone data value that is a specific frequency value in the frequency domain.

The comparator 215c compares the tone data and the set value by comparing the tone data output from the Fourier transform unit FFT 215b with a preset data value corresponding to the frequency of the tone signal inside the repeater. Function to get a value.

Thereafter, the control signal output unit (Pick detector) 215d functions to output a relay control signal when the difference value is smaller than a preset threshold. The control signal output unit (Pick detector 215d) receives the difference value as a switch control signal in the control signal output unit (Pick detector 215d) and is larger than the preset threshold value. It is possible to turn off the switch in, and to turn on the switch in the control signal output (Pick detector, 215d) when it is smaller than the threshold.

When the switch in the control signal output unit (Pick detector 215d) is turned on, the control signal output unit (Pick detector 215d) receives a signal from a voltage source in the repeater and transmits the signal to the relay control signal of the relay switch. You can print it. As the control signal output unit (Pick detector, 215d), a pick detector may be used as shown.

The relay control signal output in this manner is input as a control signal of the relay switch, so that the antenna and the second relay transmitter 220 can be connected to a switch that is basically connected to the antenna and the second relay receiver 240. It is to function.

Meanwhile, the above-described embodiments of the present invention can be written in a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates a program using a computer-readable recording medium. Computer-readable recording media include magnetic storage media (e.g., ROM, floppy disks, hard disks, magnetic tape, etc.), optical reading media (e.g., CD-ROM, DVD, optical data storage devices, etc.); Storage media such as carrier waves (eg, transmission over the Internet).

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1A to 1C are diagrams for explaining a conventional general modem-to-modem relay communication structure and problems.

2 is a view for explaining an example of a bidirectional relay system between multi-band heterogeneous modulation SDR modem in the present invention.

3 is a view for explaining an example of a transmitter of a terminal in a bidirectional relay system between a multi-band heterogeneous modulation SDR modem according to the present invention.

Figure 4a is a view for explaining an example of a repeater in a bidirectional relay system between multi-band heterogeneous modulation SDR modem according to the present invention.

4B is a view for explaining an example of a receiving end in a bidirectional repeater between multi-band heterogeneous modulation SDR modems as shown in FIG. 4A;

4C is a view for explaining an example of a tone detector in an example of a receiving end as in FIG. 4B;

Claims (12)

A first terminal for synthesizing a tone signal for controlling the relay between the heterogeneous modems in a frequency band other than the voice signal and transmitting a first signal modulated by a first type frequency band or a modulation scheme; Receiving the first signal and demodulating the first signal in a demodulation scheme corresponding to the first type of modulation scheme, then detecting the tone signal from the demodulated first signal enables two-way wireless transmission and reception between heterogeneous modems. A repeater for controlling the relay so as to transmit a second signal obtained by modulating the demodulated first signal in a frequency band or a modulation scheme of a second type; And And a second terminal receiving the second signal from the repeater and demodulating the demodulation scheme corresponding to the modulation scheme of the second type. The repeater, Filtering the tone signal from the first signal, Fourier transforming the filtered tone signal into tone data in a frequency domain, and outputting a relay control signal when the tone data is smaller than a preset threshold to bidirectionally between the heterogeneous modems. Communication system between a multi-band heterogeneous modulation SDR modem characterized in that the relay is controlled to enable wireless transmission and reception. The method of claim 1, The repeater A first signal which receives the first signal from the first terminal and demodulates the first signal by a demodulation method corresponding to the first type of modulation method; and A first relay receiver which detects the tone signal from the demodulated first signal and controls a relay to allow two-way wireless transmission and reception between heterogeneous modems; A second relay transmitter configured to output the second signal by modulating the demodulated first signal in a frequency band or a modulation scheme of a second type; And A second relay switch configured to receive the relay control signal from the first relay receiver and electrically connect the second relay transmitter and the antenna to transmit the second signal to the second terminal; Communication system between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 2, The first relay receiver A first relay demodulator which receives the first signal and demodulates and outputs a demodulation method corresponding to the first type of modulation method; A tone detector which receives the demodulated first signal and detects the tone signal from the first signal to output the relay control signal; And An analog converter which receives the demodulated first signal from the first relay demodulator and converts the first signal into an analog signal; Communication system between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 3, wherein The tone detection unit A low pass filter for receiving the first signal output from the first relay demodulator and filtering the tone signal; A Fourier transform unit for Fourier transforming the filtered tone signal into tone data in a frequency domain; A comparison unit for comparing a difference between the tone data and the setting value by comparing the tone data with a data value corresponding to a frequency of a tone signal in the repeater; And A control signal output unit configured to output the relay control signal when the difference value is smaller than a preset threshold value; Communication system between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 1, The first terminal A digital converter for converting the voice signal from an analog signal to a digital signal; A synthesizer for synthesizing the tone signal with the digitally converted voice signal; And A first modulator for outputting the first signal obtained by modulating the voice signal synthesized with the tone signal in a frequency band or a modulation scheme of the first type; Communication system between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 5, wherein The first terminal A tone signal generator for generating the tone signal having a frequency lower than that of the voice signal and outputting the tone signal to the synthesizer; Communication system between the multi-band heterogeneous modulation SDR modem further comprising a. The first signal is received from a first terminal by synthesizing a tone signal for controlling a relay between heterogeneous modems in a frequency band other than the voice signal and receiving a first signal modulated by a first type frequency band or a modulation scheme. A first signal demodulated by a demodulation method corresponding to the first type of modulation method; and the tone signal detected from the demodulated first signal to control the relay to enable two-way wireless transmission and reception between heterogeneous modems. A first relay receiver for outputting a signal; A second relay transmitter for outputting a second signal by modulating the demodulated first signal in a frequency band or a modulation scheme of a second type; And And a second relay switch configured to receive the relay control signal from the first relay receiver and electrically connect the second relay transmitter and the antenna to transmit the second signal to a second terminal. The first relay receiver, Filtering the tone signal from the first signal, Fourier transforming the filtered tone signal into tone data in a frequency domain, and outputting a relay control signal when the tone data is smaller than a preset threshold to bidirectionally between the heterogeneous modems. A bidirectional repeater between a multi-band heterogeneous modulation SDR modem, characterized in that the relay is controlled to enable wireless transmission and reception. The method of claim 7, wherein The first relay receiver A first relay demodulator which receives the first signal and demodulates and outputs a demodulation method corresponding to the first type of modulation method; A tone detector which receives the demodulated first signal and detects the tone signal from the first signal to output the relay control signal; And An analog converter which receives the demodulated first signal from the first relay demodulator and converts the first signal into an analog signal; Bidirectional repeater between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 8, The tone detection unit A low pass filter for receiving the first signal output from the first relay demodulator and filtering the tone signal; A Fourier transform unit for Fourier transforming the filtered tone signal into tone data in a frequency domain; A comparison unit for comparing a difference between the tone data and the setting value by comparing the tone data with a data value corresponding to a frequency of a tone signal in the repeater; And A control signal output unit configured to output the relay control signal when the difference value is smaller than a preset threshold value; Bidirectional repeater between the multi-band heterogeneous modulation SDR modem comprising a. The first signal is received from a first terminal by synthesizing a tone signal for controlling a relay between heterogeneous modems in a frequency band other than the voice signal and receiving a first signal modulated by a first type frequency band or a modulation scheme. A first signal demodulated by a demodulation method corresponding to the first type of modulation method; and the tone signal detected from the demodulated first signal to control the relay to enable two-way wireless transmission and reception between heterogeneous modems. A first relay step of outputting a signal; A second relay step of outputting a second signal by modulating the first signal demodulated in the first relay step by a frequency band or a modulation scheme of a second type; And A second relay switching for switching the transmitter and the antenna to be electrically connected to each other in order to receive the relay control signal output in the first relay step and transmit the second signal output in the second relay step to a second terminal; Comprising; The first relay step, Filtering the tone signal from the first signal, Fourier transforming the filtered tone signal into tone data in a frequency domain, and outputting a relay control signal when the tone data is smaller than a preset threshold to bidirectionally between the heterogeneous modems. A bidirectional relay method between multi-band heterogeneous modulation SDR modems, the relay being controlled to enable wireless transmission and reception. The method of claim 10, The first relay step A first relay demodulation step of receiving the first signal and demodulating and outputting the demodulation method corresponding to the first type of modulation method; A tone detection step of receiving the demodulated first signal and detecting the tone signal from the first signal to output the relay control signal; And An analog conversion step of receiving a first signal demodulated in the first relay demodulation step, converting the analog signal into an analog signal and outputting the analog signal; Bi-directional relay method between the multi-band heterogeneous modulation SDR modem comprising a. The method of claim 11, The tone detection step is Filtering the tone signal by receiving a first signal output in the first relay demodulation step; Fourier transforming the filtered tone signal into tone data in a frequency domain; Obtaining a difference value between the tone data and the setting value by comparing the tone data with a preset setting value; And Outputting the relay control signal when the difference is less than a preset threshold; Bi-directional relay method between the multi-band heterogeneous modulation SDR modem comprising a.

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