KR100291573B1 - Communication Experiment Apparatus Using Programmable Logic Device - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a communication training device using a programmable logic device.

2. The problem to be solved by the invention

The present invention can significantly reduce the number of module boards by integrating a plurality of independent modules by measuring waveforms, spectra, eye patterns, error rates, and the like using programmable logic devices, and without using a personal instrument for each application. The purpose of the present invention is to provide a communication training apparatus that can check the measured information through a monitor of the user, and also write a function desired by the user to download it into a programmable logic device and check the operation.

3. Summary of Solution to Invention

The present invention provides a signal conversion means for converting an input signal into a digital signal; Transmission processing means for selecting the user control information or the first control information stored in the predetermined first storage means according to the control of the control means, and then transmitting the signal transmitted from the signal conversion means according to the selected control information; Channel processing means for selecting user control information or second control information stored in the predetermined second storage means according to the control of the control means, and then distorting the signal transmitted from the transmission processing means according to the selected control information; Selecting the user control information or the third control information stored in the predetermined third storage means according to the control of the control means, and selecting the signal transmitted from the channel processing means and the radio frequency signal from the outside according to the control of the control means; Receiving processing means for receiving and processing the selected signal according to the selected control information; Control means for receiving a user command, controlling selection of control information used in the transmission processing means, the channel processing means and the reception processing means, and controlling the selection of the signal received and received by the reception processing means; And connection means for storing signals from the transmission processing means, the channel processing means and the reception processing means and connecting them to the terminal.

4. Important uses of the invention

The present invention is used in a communication training device using both analog and digital methods.

Description

Communication Experiment Apparatus Using Programmable Logic Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication training apparatus that combines analog and digital methods. In particular, a programmable logic device (PLD) is employed to measure spectra, waveforms, and eye diagrams to separate measurement information. The present invention relates to a communication training device that can be checked through a monitor of a personal computer (PC) without measuring equipment.

1 is a schematic configuration diagram of a conventional communication training apparatus, and includes amplitude modulation (AM), frequency modulation (FM), and digital modulation by frequency shift keying (FSK) or phase shift keying (PSK). It consists of a plurality of module boards MB1 to MBn that perform digital modulation functions.

Each of the plurality of module boards MB1 to MBn includes a modulation chip 110, a demodulation chip 120, an auxiliary chip 130 including a plurality of chips IC1 to ICn, and an output terminal 140.

Taking the function of the amplitude modulation module as an example, the operation of a conventional communication training device having such a structure will be described below.

In general, the modulation chip 110, the auxiliary chip 130 and the demodulation chip 120 is a commercial chip for amplitude modulation or demodulation, respectively.

The modulation chip 110 imposes a carrier wave on the modulated wave to perform amplitude modulation. The amplitude modulated signal is input to the demodulation chip 120 through signal processing steps such as amplification and filtering by the auxiliary chip 130.

The demodulation chip 120 recovers a modulated wave by removing a carrier component from an input signal.

And, the output terminal 140 is used for the purpose of checking the flow of the signal for a series of modulation and demodulation process, that is, the user connects the instrument to the output terminal 140 to measure signal information such as waveform and spectrum .

As shown in FIG. 1, the conventional communication training apparatus is designed using commercial chips that perform the functions of each module board. Therefore, each independent module board (for example, an AM module, an FM module, an FSK module, and a PSK module) is designed. Back).

However, in the conventional communication training apparatus as described above, in order to measure waveforms and spectra, the designer has a structure to measure using an additional instrument such as an oscilloscope or spectrum analyzer, and the output terminal is predetermined. The function is greatly simplified by measuring waveforms and the like according to a predetermined procedure, and thus, the problem is merely a simplified tool that is to learn a measurement procedure and method of a given practice apparatus rather than a function of learning a communication theory. there was.

Accordingly, the present invention has been made to solve the above problems, by measuring the waveform, spectrum, eye pattern and error rate using a programmable logic device, integrating a large number of independent modules to significantly increase the number of module boards It is possible to reduce the information, and to check the information measured by the monitor of the personal computer without using a separate measuring instrument for each purpose, and to check the operation by writing down a function desired by the user to a programmable logic device. It is an object of the present invention to provide a communication training device.

1 is a schematic diagram of a conventional communication training apparatus.

Figure 2 is a block diagram of an embodiment of a communication training apparatus using a programmable logic device according to the present invention.

Explanation of symbols on the main parts of the drawings

210: signal conversion unit 220: signal connection unit

230: transmitting end module 240: channel module

250: receiver module 260: signal recovery unit

270: control unit

In order to achieve the above object, the present invention provides a communication training apparatus that executes transmission and reception functions of a communication system so as to check information executed by a terminal, and converts a signal for converting an input signal from an external device into a digital signal. Way; After selecting one of the user control information input from the terminal or one of the first control information previously stored in a predetermined first storage means according to the control of the control means, the signal transmitted from the signal conversion means is selected. Transmission processing means for transmitting and transmitting the transmission according to the selected control information; After selecting one of the control information of the user control information or the second control information previously stored in the predetermined second storage means according to the control of the control means, and applying the noise signal according to the selected control information and transmitting the Channel processing means for distorting and transmitting the signal transmitted from the processing means; The control information of the user control information or the third control information pre-stored in the predetermined third storage means is selected according to the control of the control means, and is input from a signal transmitted from the channel processing means or from an external source. Receiving processing means for receiving a radio frequency signal according to the control of the control means and then receiving the selected signal according to the selected control information; Receiving a user command from an external device, controlling selection of control information used in the transmission processing means, the channel processing means and the reception processing means, and controlling the selection of a signal processed by the reception processing means; Control means; And connection means for temporarily storing signals from the transmission processing means, the channel processing means and the reception processing means and connecting them to the terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a block diagram of an embodiment of a communication training apparatus using a programmable logic device according to the present invention.

As shown in FIG. 2, the communication training apparatus of the present invention includes a signal converter 210 for converting the transmitted signals into digital signals, and a signal processed by the personal computer 201 to each module of the communication training apparatus. Signal connection unit 220 for displaying the waveform, spectrum, eye pattern, etc. on the monitor by transmitting or storing the signal processed in each module of the communication training device to the personal computer 201, and analog modulation, digital modulation, basis Transmitter module 230 for providing a function such as band transmission, Channel module 240 for imposing channel characteristics such as Gaussian noise channel, fading channel, satellite channel to the signal transmitted from the transmitter module 230, and the channel module ( 240 or a receiver module 250 for demodulating and detecting a signal transmitted from the transmitter module 230, a signal recovery unit 260 for restoring an original signal from the signal detected by the receiver module 250; Receiving a user's instructions provided with a control unit 270 for controlling the modules (230, 240, 250).

The signal converter 210 may include an electrical signal converter 211 for converting an audio signal, an image signal, and data transmitted from the outside or the inside into an electrical signal, and an analog signal converted into an electrical signal by the electrical signal converter 211. The analog / digital converter 212 converts the signal into a digital signal and outputs the signal to the programmable logic device 234 of the transmitter module 230.

The signal connection unit 220 stores the data transmitted from the programmable logic element 234 of the transmitting end module 230 and the personal computer 201 and stores the data stored on demand of the programmable logic element 234. A memory 221 which transfers the data transferred from the programmable logic device 234 to the personal computer 201 upon the request of the personal computer 201 and the programmable logic of the channel module 240. Stores the data transmitted from the device 244 and the personal computer 201 to transfer the stored data to the programmable logic device 244 upon request of the programmable logic device 244 and to program the on-demand program of the personal computer 201. A memory 222 which transfers the data transferred from the possible logic element 244 to the personal computer 201, and the programmable logic element 254 of the receiving end module 250 and the personal computer. The data transferred from the controller 201 to the programmable logic device 254 to transfer the stored data to the programmable logic device 254 upon request of the programmable logic device 254, and to the programmable logic device 254 to the personal computer 201 upon request. Memory 223 for transferring the data transmitted from the personal computer 201 to the personal computer 201, and a serial port (using a commercially available RS232, etc.) or a PCI (Persnal Computer Interface) bus of the personal computer 201 are possible. Interface 224 for connecting data between the personal computer 201 and the memories 221, 222, and 223.

The transmitting end module 230 may include a downloading unit 231 for downloading the user program transmitted from the personal computer 201 to the programmable logic device 234, an analog modulation program, a digital modulation program, A storage unit 232 made up of ROMs (Read Only Memory) (ROMs 1 to n), each of which stores a code division multiple access (CDMA) program, a channel coding program, and the like, and a controller 270; A selection unit 233 for selectively transferring the user programs downloaded by the downloading unit 231 and the programs transferred from the ROMs 1 to n in the storage unit 232 under the control of the selection unit 231; A programmable logic device (PLD) 234 that executes a program selected and transferred by the processor 233 to process a substantial signal, and converts a digital signal transmitted from the PLD 234 into an analog signal to externally. A signal output unit 235 to be connected to the instrument, a digital / analog converter 236 for converting a digital signal output from the PLD 234 into an analog signal, and an analog transmitted from the digital / analog converter 236. The signal matching unit 237 converts the signal to match with a wired medium such as wireless or coaxial line.

The channel module 240 includes a downloading unit 241 for downloading a user program transmitted from the personal computer 201 to the PLD 244, an analog modulation program, a digital modulation program, a code division multiple access program, and a channel. A storage unit 242 consisting of ROMs 1 to n each storing a coding program and the like, and a user program and storage unit 242 downloaded by the downloading unit 241 under the control of the control unit 270. A selector 243 for selectively delivering the programs transmitted from the ROMs 1 to n in the < RTI ID = 0.0 >), < / RTI > a PLD 244 for executing a program selected and delivered by the selector 243 and processing a substantial signal; And a signal output unit 245 for converting the digital signal transmitted from the PLD 244 into an analog signal so as to be connected to an external measuring instrument.

The receiving end module 250 includes a downloading unit 251 for downloading a user program transmitted from the personal computer 201 to the PLD 254, an analog modulation program, a digital modulation program, a code division multiple access program, and a channel. A storage unit 252 made up of ROMs 1 to n, each of which stores a coding program and the like, and a user program and storage unit 252 downloaded by the downloading unit 251 under the control of the controller 270. A selection unit 253 for selectively delivering the programs transmitted from the ROMs 1 to n in the C9), a PLD 254 for executing a program selected and delivered by the selection unit 253 to process a substantial signal; In addition, an input processor 255 for converting an analog signal transmitted from a wired medium such as an external wireless or coaxial line and matching the communication training device, and converts the analog signal transmitted from the input processor 255 into a digital signal. The PLD 254 converts the output signal of the PLD 244 of the channel module 240 and the digital signal transmitted from the analog / digital converter 256 under the control of the analog / digital converter 256 and the control unit 270. And a selection unit 257 for selectively transmitting a signal, and a signal output unit 258 for converting a digital signal transmitted from the PLD 254 into an analog signal so as to be connected to an external measuring instrument.

The signal recovering unit 260 converts an output of the PLD 254 of the receiving end module 250 into an analog signal, and converts the analog signal transmitted from the digital / analog converter 261 into an original signal. And a signal recoverer 262 for restoring the audio signal, the received signal and the data signal.

Referring to the operation of the communication training device of the present invention having the structure as described above in detail. However, the signal used below is a voice signal, and the modulation / demodulation method uses the QPSK method, the channel type is a fading channel, and the channel medium has been described as an example.

An audio signal is converted into an electrical signal by an electric signal converter 211 such as a condenser microphone and input to the analog / digital converter 212. When performing Pulse Code Modulation (PCM) conversion with a commercial chip, the analog / digital converter 212 is replaced with an analog / digital conversion commercial chip using a pulse coding modulation method, and pulsed by the PLD 234. When performing coded modulation, the analog-to-digital converter 212 uses a simple converter.

If the user wants to perform a modulation function by directly downloading a QPSK modulation program and downloading it to the PLD 234, the control unit 270 receives the control, and the selection unit 233 selects a program to be downloaded and then PLD ( 234). At this time, in order to use the pre-produced QPSK modulation function, the control unit 270 receives the control signal and the selection unit 233 selects the QPSK modulation program stored in the storage unit 232 and outputs the PLD 234. .

Thus, according to the contents of the program transmitted from the selection unit 233, the PLD 234 processes the digital signal transmitted from the analog-to-digital converter 212 or the data read from the memory 221.

Here, the PLD 234 performs a prediction encoding such as ADPCM, a compression encoding such as MPEG, a channel encoding such as a convolutional code, or an encryption such as DES or RSA to transmit a transmission signal. Process. At this time, the processed signal is converted into waveforms such as RZ, NRZ, Manchester, and the like and processed by Nyquist filtering to modulate the signal in a manner such as FSK, PSK, and QAM.

As such, the processed transmission signal is forwarded to the PLD 244 to perform the channel function.

On the other hand, when the channel characteristic is not imposed, the signal processed by the PLD 234 is output to the digital-to-analog converter 236, and the signals of the point to be tested among the signals processed by the PLD 234 are respectively. It is output to the signal output unit 235 and the memory 221.

Since the signal output unit 235 converts the signal input from the PLD 234 into an analog signal and outputs the signal, the signal of the test point can be confirmed through the meter when there is a separate meter.

The signal output from the PLD 234 to the memory 221 is transmitted to the personal computer 201 via the interface 224.

As such, when the signal processed by the PLD 234 is transmitted to the personal computer 201 through the signal connection unit 220, the personal computer 201 processes the transmitted signal by software to perform waveform, spectrum and It is displayed on the monitor in a form that users can check such as constellation.

The signal matching unit 237 converts the analog signal transmitted from the digital / analog converter 236 into a radio frequency signal for wireless transmission and transmits the radio signal.

If the channel characteristic is imposed, the signal processed by the PLD 234 is output to the PLD 244 of the channel module 240.

If the user wants to make a channel characteristic program and download it to the PLD 244 to perform the channel characteristic imposing function, the selection unit 243 receives a control signal of the controller 270 to download the program to be downloaded. It selects and outputs to the PLD (244).

In addition, in order to use the prepared channel characteristics, the control unit 270 receives the control signal and the selector 243 selects the channel characteristic program stored in the storage unit 242 and outputs it to the PLD 244. .

As such, according to the contents of the downloaded program, the PLD 244 processes the signal transmitted from the memory 222 or the PLD 234 of the transmitting end module 230. In this way, signals of the point to be tested among the processed signals are output to the signal output unit 245 and the memory 222, respectively.

In addition, the signal output unit 245 converts the signal transmitted from the PLD 244 into an analog signal and outputs the analog signal, so that when there is a separate measuring device, the signal at the test point can be confirmed through the measuring device.

In addition, the signal output from the PLD 244 to the memory 222 is transmitted to the personal computer 201 through the interface 224, the personal computer 201 is then software-transmitted signal from the memory 222. The monitor displays the waveform and spectrum of the signal in a form that the user can check.

On the other hand, the PLD 244 imposes a noise characteristic according to the downloaded program content and outputs it to the PLD 234 of the transmitter module 230.

That is, the PLD 244 imposes AWGN noise on the signal transmitted from the PLD 234 of the transmitting end module 230, imposes Rayleigh or Rician fading effects, or imposes nonlinear amplification effects such as satellite channels. Process the signal.

As such, the processed signal is transmitted to the PLD 254 of the receiving end module 250.

As such, the signal transmitted to the PLD 234 of the transmitting end module 230 is output to the digital-to-analog converter 236. At this time, signals of a point to be tested among the signals processed by the PLD 234 are output to the signal output unit 235 and the memory 221, respectively.

As such, the signals transmitted to the signal output unit 235 and the memory 221 are processed through the above-described processes.

Likewise, the signal transmitted from the PLD 234 to the digital-to-analog converter 236 is also wirelessly transmitted through the process described above.

In this way, the radio waves are converted into an electrical signal again in the input processing unit 255 of the receiving end module 250 is converted into a digital signal through the analog-to-digital converter 256 and then transmitted to the selection unit 257.

Subsequently, the selector 257 under the control of the controller 270 performs a function of selecting an input signal and outputting the input signal to the PLD 254 by simply applying a channel characteristic and a signal input through a wireless or wired medium. Here, the signal input via the wireless medium is output to the PLD 254.

In addition, when a user directly produces a QPSK demodulation program and downloads it to the PLD 254 to perform a demodulation function, the selector 253 selects a program to be downloaded according to a control signal of the controller 270. To the PLD 254.

In this case, when using the pre-produced QPSK demodulation function, the controller 270 controls the selection unit 253 to select the QPSK demodulation program stored in the storage unit 252 and transmit the selected QPSK demodulation program to the PLD 254.

Subsequently, the PLD 254 processes the signal transmitted from the memory 223 or the selection unit 257 according to the content of the downloaded program.

That is, since the PLD 254 needs to perform a receiver function, if the input signal is modulated, symbol synchronization and phase synchronization are performed to perform synchronous demodulation, or asynchronous demodulation, and then through channel encoding according to channel encoding, If the decoding is performed according to the prediction decoding or the compression encoding, the decoding process corresponding to the decoding is performed, and finally, the digital signal transferred from the signal converter 210 is restored to the original signal.

In this way, the processed signal is output to the digital-to-analog converter 261, and at this time, signals of the point to be tested among the processed signals are output to the signal output unit 258 and the memory 223, respectively.

When the signal processed by the PLD 254 is transmitted through the process as described above, the signal output unit 258 converts the transmitted signal into an analog signal and outputs the analog signal so that the signal of the test point is measured when there is a separate measuring instrument. The signal output to the memory 223 is also transmitted to the personal computer 201 through the interface 224.

In addition, the personal computer 201 processes the signal transmitted from the memory 223 by software and displays the signal through a monitor in a form that can be checked by a user such as a waveform, spectrum, constellation, and eye pattern of the signal.

On the other hand, the digital signal transmitted from the PLD 254 to the digital-to-analog converter 261 is converted into an analog signal and then restored to its original state through a signal recoverer 262 such as a speaker.

Although the technical spirit of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention integrates a large number of independent modules using a programmable logic device without using a commercial analog or digital chip, thereby greatly reducing the number of module boards, and allowing a user to manufacture and practice a communication module. In addition, the measured information can be checked using only a personal computer without a measuring instrument, which can significantly reduce costs.

Claims (8)

In the communication training apparatus for executing the transmission and reception functions of the communication system to check the executed information through the terminal, Signal conversion means for converting an input signal from the outside into a digital signal; After selecting one of the user control information input from the terminal or one of the first control information previously stored in a predetermined first storage means according to the control of the control means, the signal transmitted from the signal conversion means is selected. Transmission processing means for transmitting and transmitting the transmission according to the selected control information; After selecting one of the control information of the user control information or the second control information previously stored in the predetermined second storage means according to the control of the control means, and applying the noise signal according to the selected control information and transmitting the Channel processing means for distorting and transmitting the signal transmitted from the processing means; The control information of the user control information or the third control information pre-stored in the predetermined third storage means is selected according to the control of the control means, and is input from a signal transmitted from the channel processing means or from an external source. Receiving processing means for receiving a radio frequency signal according to the control of the control means and then receiving the selected signal according to the selected control information; Receiving a user command from an external device, controlling selection of control information used in the transmission processing means, the channel processing means and the reception processing means, and controlling the selection of a signal processed by the reception processing means; Control means; And Connection means for temporarily storing signals from said transmission processing means, said channel processing means and said receiving processing means and connecting them to said terminal; Communication training device using a programmable logic device comprising a. The method of claim 1, Digital / analog converting means for converting a digital signal transferred to said receiving processing means into an analog signal; And Signal recovery means for recovering an analog signal transmitted from the digital / analog conversion means to an original signal Communication training apparatus using a programmable logic device made further comprising. The method of claim 1, The signal conversion means, Electrical signal conversion means for converting an input signal from the outside into an electrical analog signal; And Analog / digital converting means for converting the analog signal converted by the electric signal converting means into a digital signal Communication training device using a programmable logic device comprising a. The method of claim 1, The transmission processing means, Downloading means for downloading the user control information transmitted from the terminal; The first storage means comprising a plurality of ROMs (ROMs) for storing the first control information, respectively; Selection means for selectively transferring user control information transmitted from the downloading means and first control information stored in the first storage means according to the control of the control means; Transmission means comprising a programmable logic device that substantially performs encryption, encoding, waveform shaping, and modulation functions on signals transmitted from the signal conversion means according to the control information selected by the selection means; Signal output means for converting the digital signal transmitted from the transmission means into an analog signal and outputting the signal to the outside; Digital / analog conversion means for converting the digital signal output from the transmission means into an analog signal; And Signal matching means for matching the analog signal converted by the digital / analog conversion means to an external wired medium Communication training device using a programmable logic device comprising a. The method of claim 1, The channel processing means, Downloading means for downloading the user control information transmitted from the terminal; The second storage means having a plurality of read only memories (ROM) for storing the second control information, respectively; Selection means for selectively transferring the user control information and the second control information transmitted from the downloading means according to the control of the control means; Channel means comprising a programmable logic device which distorts the signal transmitted from the transmission processing means and transmits it to the reception processing means and the connection means according to the control information selected and transmitted by the selection means; And Signal output means for converting the digital signal transmitted from the channel means to an analog signal to output to the outside Communication training device using a programmable logic device comprising a. The method of claim 1, The reception processing means, Downloading means for downloading the user control information transmitted from the terminal; The third storage means comprising a plurality of read only memories (ROM) for storing the third control information, respectively; First selecting means for selectively transferring the user control information and the third control information transmitted from the downloading means according to the control of the control means; Input processing means for converting an external radio frequency signal into an analog signal and matching the same; Analog / digital converting means for converting the analog signal matched and transmitted by the input processing means into a digital signal; Second selection means for selectively transferring a signal transmitted from the channel processing means and a digital signal transmitted from the analog / digital converting means, according to the control of the control means; A reception consisting of a programmable logic device that substantially decodes and demodulates the signal selected and transmitted by the second selection means to the connection means according to the control information selected by the first selection means; Way; And Signal output means for converting the digital signal transmitted from the receiving means to an analog signal to output to the outside Communication training device using a programmable logic device comprising a. The method according to any one of claims 1 to 6, The connecting means, Fourth storage means for temporarily storing the signal transmitted from the transmission processing means; Fifth storage means for temporarily storing a signal transmitted from said channel processing means; Sixth storage means for temporarily storing the signal transmitted from the reception processing means; And Signal transmission means for transmitting a signal stored in the fourth to sixth storage means to the terminal Communication training device using a programmable logic device comprising a. The method according to any one of claims 1 to 6, The first to third storage means, respectively, A practical training device using a programmable logic element, characterized by substantially storing an analog modulation program, a digital modulation program, a Code Division Multiple Access (CDMA) program, and a channel coding program.