RU2603493C2 - Automated device for increasing of data transfer channel quality - Google Patents

Automated device for increasing of data transfer channel quality Download PDF

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Publication number
RU2603493C2
RU2603493C2 RU2014147185/08A RU2014147185A RU2603493C2 RU 2603493 C2 RU2603493 C2 RU 2603493C2 RU 2014147185/08 A RU2014147185/08 A RU 2014147185/08A RU 2014147185 A RU2014147185 A RU 2014147185A RU 2603493 C2 RU2603493 C2 RU 2603493C2
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Russia
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input
output
connected
signal
block
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RU2014147185/08A
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Russian (ru)
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RU2014147185A (en
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Сергей Валерьевич Власов
Валерий Иванович Власов
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Сергей Валерьевич Власов
Валерий Иванович Власов
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/46Monitoring; Testing
    • H04B3/487Testing crosstalk effects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0062Avoidance of ingress interference, e.g. ham radio channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0073Allocation arrangements that take into account other cell interferences

Abstract

FIELD: communication.
SUBSTANCE: invention relates to electrical communication. Device comprises signal/noise ratio meter, prohibition unit, amplitude detector, first threshold unit, jamming signal generator, additional switch, limiter, frequency detector, second threshold unit, switch and calling party signal recording unit, operating amplifier, band-pass filter, modem, consisting of modulator and demodulator, computer, rejector filter, phase changer, delay line, adder, subtractor, condenser, integrator, inverter, “AND” element, variable-frequency generator.
EFFECT: technical result is higher quality of data transfer channel by increasing reliability of data channel digital signals recovery using sequencing multilevel amplitude modulation (QAM) in channel under data channel exposure to additive and multiplicative interferences.
1 cl, 1 dwg

Description

The invention relates to telecommunications and can be used to create automated control systems using computer technology and data transmission channels.

A device is known for measuring the quality of discrete information transmission channels (USSR author's certificate No. 1358105, class H04L 11/07), comprising a signal-to-noise ratio meter, an input signal simulator, a third key, a valve, an analyzer, an error detection unit, a switch, an additional counter, OR element, measured receiver, inhibit block, amplitude detector, first threshold block, clog signal shaper, additional key, limiter, frequency detector, voltmeter, indicator, first key, second threshold block, second cl h, counter, the time interval generator, an indicator and terminal equipment.

The disadvantage of this device is the low reliability of the restoration of digital signals of a data transmission channel using multi-level multiphase amplitude modulation (QAM) when an additive and multiplicative noise is applied to the data transmission channel.

The purpose of the invention is to improve the quality of the data transmission channel by increasing the reliability of the recovery of digital signals of the data transmission channel using multi-level multiphase amplitude modulation (QAM) in the channel when the data channel is subjected to additive and multiplicative noise.

The data channel includes a data link channel and terminal equipment. A communication link of a data transmission channel may represent both a cable and a radio channel.

To achieve this goal, a device for measuring the quality of discrete information transmission channels, comprising a signal-to-noise ratio meter, a prohibition unit, an amplitude detector, a first threshold block, a clog signal shaper, an additional key, a limiter, a frequency detector, a second threshold block, a switch, and a registration block correspondent signal, operational amplifier, band-pass filter, modem consisting of a modulator and a demodulator, computer, notch filter, phase shifter, delay line, amount OP, subtractor, capacitor, integrator, inverter, AND element, tunable frequency generator, the output of the data link being connected to the first input of the operational amplifier and the input of the device, the output of the operational amplifier connected to the first input of the bandpass filter, the output of which is connected in parallel to the input of the modem demodulator, the first input of the additional key, the input of the delay line, the input of the inhibit block, the input of the amplitude detector, the output of the demodulator is connected in parallel to the information computer input, the first input of the switch and the input of the correspondent signal registration unit, the output of which is connected in parallel to the second input of the switch and to the second input of the integrator, the output of the additional key is connected to the input of the notch filter, the output of which is connected in parallel to the inputs of the phase shifter and to the input of the frequency detector, the output of which is connected in parallel to the input of the capacitor and to the first input of the tunable frequency generator, the output of which is connected to the second input of the operating device starter, and the second input of the tunable frequency generator is connected to the output of the And element, the output of the threshold block is connected to one input and the inverter output is connected to the other input, the input of which is connected to the integrator output, the input of which is connected to the capacitor output, the phase shifter output is connected to the first the adder input, to the second input of which the delay line output is connected, and the adder output is connected to the first input of the subtractor, the modem modulator output is connected to the second input, and the subtract output ayuschego device connected to the second input of the bandpass filter, the information output of the computer is connected to the third input switch, whose output is connected to the input of the modem modulator.

The figure 1 shows the functional electrical diagram of the proposed device.

The automated device of the data transmission channel contains an operational amplifier 1, a bandpass filter 2, a modem 3, consisting of a demodulator 3.1 and a modulator 3.2, a switch 4, a computer 5, an additional key 6, an amplitude detector 7, a prohibition block 8, a notch filter 9, a first threshold block 10, a signal-to-noise ratio meter 11, a correspondent signal registration unit 12, a frequency detector 13, a clogging signal driver 14, a second threshold unit 15, a capacitor 16, an integrator 17, an inverter 18, an element 19, a tunable frequency generator 20, the delay start 21, the phase shifter 22, the adder 23, the subtracting device 24, and the output of the communication channel of the data channel is connected to the first input of the operational amplifier 1 and is the input of the device, the output of the operational amplifier is connected to the first input of the bandpass filter 2, the output of which is connected in parallel to the input demodulator modem 3.1, the first input of the additional key 6, the input of the delay line 21, the first input of the prohibition block 8, the input of the amplitude detector 7, the output of the demodulator 3.1 is connected in parallel to the input of the computer 5, the first the input of the switch 4 and the input of the signal recording unit of the correspondent 12, the output of which is parallel connected to the second input of the switch 4 and to the second input of the integrator 17, the output of the additional key 6 is connected to the input of the notch filter 9, the output of which is connected in parallel to the inputs of the phase shifter 22 and to the input of the frequency detector 13, the output of which is connected in parallel to the input of the capacitor 16 and to the first input of the tunable frequency generator 20, the output of which is connected to the second input of the operational amplifier 1, and the second The tunable frequency generator 20 is connected to the output of the And 19 element, the output of the threshold unit 15 is connected to one input of which the inverter 18 is connected to the other input, the input of which is connected to the output of the integrator 17, the input of which is connected to the output of the capacitor 16, the output of the phase shifter 22 connected to the first input of the adder 23, to the second input of which the output of the delay line 21 is connected, and the output of the adder 23 is connected to the first input of the subtractor 24, to the second input of which the output of the modulator 3.2 of modem 3 is connected, and the output is the emitting device 24 is connected to the second input of the bandpass filter 2, the output of the amplitude detector 7 is connected to the input of the first threshold block 10, the output of which is connected to the input of the clogging signal driver 14, the output of which is connected in parallel to the second input of the additional key 6 and to the second input of the inhibit block 8 , the output of the prohibition block 8 is connected to the input of the signal-to-noise ratio meter 11, the output of which is connected to the input of the second threshold block 15, the information output of computer 5 is connected to the third input of switch 4, you od which is connected to the input of a modulator of the modem 3 3.2.

The principle of operation of the proposed device is as follows. In modern modems, the digital code is modulated, coming from the information output of the computer to the modulator into an analog signal of multiphase multilevel quadrature amplitude modulation (QAM). At the output of the modulator, the elements of the carrier frequency of the modulated signal with alternating sine waves and cosines of the carrier frequency are observed. Depending on the elements of the signal constellation due to the encoding protocol, a significant number of bytes of digital information can be encoded in the modem in each element of the carrier frequency of the analog signal. In the demodulator, the inverse process of converting the sine and cosine elements of the carrier frequency to a digital code (for example, the Manchester code), which is fed to the digital information input of the computer, takes place. The signal constellation of the modem, due to the encoding protocol, allows you to receive an analog signal at the modulator output, in the parameters of the amplitude, phase of the cosine wave or sine wave of the elements contains a digital code of the information digital signal at the computer output (O. I. Lagutenko. Modern modems. Publisher: Eco-Trends: 2002 ISBN: 5-88405-037-2-346 p.). Under the influence of multiplicative noise on the communication line of the data transmission channel, caused, for example, by increased cable resistance, a general decrease in the amplitudes of all elements of the analog signal will be observed. In this case, the demodulator will recognize the signal, but give a false digital code at the output, due to the sinusoidal and cosine components with the correct phases, but with false amplitudes. Moreover, the larger the signal constellation, the closer the amplitudes of the analog signal, which determine a different digital code, are, the communication system is more sensitive to amplitude errors and, as a result, the reliability of the digital signal at the computer input will be low.

Under the influence of additive interference, the interference energy is added to the signal energy. With an amplitude multilevel multiphase quadrature modulation, the demodulator strictly responds to the magnitude of the amplitudes and phases of the sinusoidal and cosine components. With additive interference, there is a high probability of an error in determining the phase of the element of the analog signal, especially if the noise is narrow-band, directional, and its frequency is close to the carrier frequency of the analog modulated signal.

The proposed device monitors, controls the presence of multiplicative and additive interference in the communication line of the data channel and automatically significantly reduces them at the input of the modem demodulator, thereby increasing the reliability of the received digital code at the information input of the computer.

The device operates as follows. Passing through the communication line, the modulated information signal after passing through the cables undergoes distortions due to the influence of the external propagation medium on the communication line (noise, changes in temperature, humidity, etc.). The computer operates in simplex mode, that is, until a frame is received from the communication channel, the computer will not transmit its information frame to the communication channel.

An analog modulated signal comes from the communication channel of the data channel to the input of operational amplifier 1 and, if the amplitudes of the sinusoidal and cosine components correspond to the specified values of the signal constellation protocol, the gain of the operational amplifier 1 does not change and the signal passes through it without changes. Next, the signal is fed to a band-pass filter 2, which is configured to pass the carrier frequency of the information signal, from where, through the demodulator 3.1 of modem 3, a demodulated digital code is fed to the information input of computer 5.

In the event that an additive noise appears in the signal at the input of the device, the signal enters the input of the amplitude detector 7, the output of which generates an interference signal, a voltage appears at the output of the threshold unit 10, by which the driver 14 gives a clogging signal, which is fed to the second input of the additional key 6 and the second input of the inhibit block 8. The clogging signal opens an additional key 6 and the inhibit block 8. The signal through the open inhibit block 8 is fed to the input of the signal-to-noise ratio meter 11. The measurement result is sent to the second swarm threshold block 15. If the signal-to-noise ratio is lower than the threshold, then at the output of the threshold block 15 there is a logical “1”, which is fed to one input of the And 19. element. The interference signal goes through the public key 6 to the input of the notch filter 9, where filtering the carrier frequency of the signal, that is, removing the carrier frequency from the signal. The distinguished noise goes to the input of the frequency detector 13, at the output of which, if the signal has a narrow-band constant noise, a constant voltage will be generated equivalent to the frequency of the narrow-band noise, if the noise is wide-band (for example, “White noise”), then the output of the frequency detector 14 will be a broadband signal. If a constant voltage due to narrow-band interference is applied to the input of the capacitor 16, there is no voltage at the output of the capacitor 16 and a logical “1” is formed at the output of the inverter, which is fed to the other input of the And 19. In this case, a logical “Is formed at the output of the And 19 1 ", which enters the control input of the tunable frequency generator 20 and starts it, the second input of the tunable frequency generator 20 receives a constant voltage from the output of the frequency detector 13, equivalent to the frequency bellows. The tunable frequency generator 20 is tuned to a frequency equal to the interference frequency in accordance with the applied control constant voltage to its input. At the output, the tunable frequency generator 20 starts to produce a voltage with an interference frequency that is fed to the input of the bandpass filter 2. The bandpass filter adjusts the filtering frequency band to the frequency of the tunable frequency generator 20 and filters the narrow-band detected noise.

Simultaneously with the output of the notch filter 9, an interference signal is received at the input of the adder 23, and, passing through the phase shifter 22, the phase of the noise in the phase shifter 22 changes by 180 °. The signal from the output of the bandpass filter 2 and the input of the demodulator 3.1 receives a signal from the output of the adder 23 through the delay line 21. The delay line 21 is necessary to delay the signal while the signal passes through the additional switch 6, filter 9 and phase shifter 22. Since the interference from the output of phase shifter 22 and the signal with additive noise from the output of the delay line 23 is in antiphase, then an analog informational signal without interference energy is obtained at the output of the adder 23. The signal from the output of the adder 23 is fed to the input of the subtractor 24, the other input of which receives a modulated analog signal of the same shape and structure as the “clean signal” received by demodulator 3.1, since it is obtained by modulating the same carrier frequency with the same code as well as the received signal from the communication line, and the parameters of the signal entering the second input of the subtracting device 24 from the output of the modulator 3.2 are not subject to destabilizing factors of the communication line (additive and multiplicative noise). A “clean signal” is generated at the second input of the subtractor 24 as follows. At the output of demodulator 3.1, a digital signal of the corresponding code structure is fed to the information input of computer 5 and to the first input of switch 4. Since the computer operates in simplex mode, there is no signal at the information output of computer 5 and modulator 3.2 for the time the signal is received from the communication channel of the transmission channel data is functionally free. The switch 4 switches the digital signal from the output of the demodulator 3.1 to the input of the modulator 3.2 when applying to its second input a control signal from the output of the recording unit of the correspondent signal 12. At the same time, the signal from the output of the recording unit of the correspondent signal 12 is a reset and zero signal of the integrator 17. Subtractor 24 subtracts the amplitude values of the voltage of the analog signal coming from the output of the modulator 3.2 "clean signal" to the second input of the subtractor 24 from the amplitude values of the signal without add the apparent interference at the first input of the subtractor 24. The difference in voltage is applied to the second control input of the operational amplifier 1 to increase the gain in order to eliminate the error in the amplitude of the input signal from the communication line to the device due to multiplicative interference.

The technical result consists in the fact that the device carries out automated control of multiplicative and additive interference in the communication line of the data channel during the transmission of digital information packets by the correspondent with a significant reduction in the negative impact of interference on the demodulated digital signal received at the input of computer 5, reducing the errors of the digital code, thereby increasing the reliability of the restoration of digital signals of the data channel using a multi-level multiphase channel amplitude modulation (QAM). The quality of the data channel is significantly improved.

Claims (1)

  1. An automated device for a data transmission channel comprising a signal-to-noise ratio meter, a prohibition block, an amplitude detector, a first threshold block, a clog signal shaper, an additional key, a limiter, a frequency detector, a second threshold block, a switch, and a correspondent signal registration block, characterized in that an operational amplifier, a bandpass filter, a modem consisting of a modulator and a demodulator, a computer, a notch filter, a phase shifter, a delay line, an adder subtracting, are introduced a device, a capacitor, an integrator, an inverter, an AND element, a tunable frequency generator, the output of the data link being connected to the first input of the operational amplifier and being the input of the device, the output of the operational amplifier connected to the first input of the bandpass filter, the output of which is connected in parallel to the input of the demodulator modem, the first input of the additional key, the input of the delay line, the first input of the prohibition block, the input of the amplitude detector, the output of the demodulator is connected in parallel to the information at the computer input, the first input of the switch and the input of the correspondent signal registration unit, the output of which is connected in parallel to the second input of the switch and to the second input of the integrator, the output of the additional key is connected to the input of the notch filter, the output of which is connected in parallel to the inputs of the phase shifter and to the input of the frequency detector, the output of which is connected in parallel to the input of the capacitor and to the first input of the tunable frequency generator, the output of which is connected to the second input of the operational amplifier and the second input of the tunable frequency generator is connected to the output of the And element, the output of the second threshold block is connected to one input of the output, and the inverter output is connected to the other input, the input of which is connected to the integrator output, the first input of which is connected to the capacitor output, the phase shifter output is connected to the first input of the adder, to the second input of which the output of the delay line is connected, and the output of the adder is connected to the first input of the subtractor, the second input of which is connected to the output of the modem modulator, which the first is the input to the communication line of the data channel, and the output of the subtractor is connected to the second input of the bandpass filter, the information output of the computer is connected to the third input of the switch, the output of which is connected to the input of the modem modulator, the output of the amplitude detector is connected to the input of the first threshold block, the output of which connected to the input of the driver of the clogging signal, the output of which is connected in parallel to the second input of the additional key and to the second input of the block prohibition, the output of which is connected to dy measuring signal / noise ratio, the output of which is connected to the input of the second threshold block.
RU2014147185/08A 2014-11-24 2014-11-24 Automated device for increasing of data transfer channel quality RU2603493C2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU473965A1 (en) * 1973-05-24 1975-06-14 Device for automatic control of amplitude-frequency characteristics of pulse receivers
SU1695522A2 (en) * 1989-12-25 1991-11-30 Ставропольское высшее военное инженерное училище связи им.60-летия Великого Октября Device for determination of performance of channels of discrete information transmission
SU1748095A1 (en) * 1990-05-07 1992-07-15 Ростовский научно-исследовательский институт радиосвязи Method of determining a signal-to-noise ratio of the radio signal
EP1382308B1 (en) * 2002-07-18 2007-12-05 Biosense Webster, Inc. Distal targeting of locking screws in intramedullary nails

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU473965A1 (en) * 1973-05-24 1975-06-14 Device for automatic control of amplitude-frequency characteristics of pulse receivers
SU1695522A2 (en) * 1989-12-25 1991-11-30 Ставропольское высшее военное инженерное училище связи им.60-летия Великого Октября Device for determination of performance of channels of discrete information transmission
SU1748095A1 (en) * 1990-05-07 1992-07-15 Ростовский научно-исследовательский институт радиосвязи Method of determining a signal-to-noise ratio of the radio signal
EP1382308B1 (en) * 2002-07-18 2007-12-05 Biosense Webster, Inc. Distal targeting of locking screws in intramedullary nails

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