Device for controlling quality of communication line of data transfer channel

FIELD: measuring equipment.

SUBSTANCE: as a source of standard signal not separate generator of test signal according to known code structure is used, but a component of modem, to provide for substantial simplification of process under unfavorable conditions.

EFFECT: higher efficiency.

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The invention relates to measuring technique and can be used to create automated quality control communication lines of the data transmission channel without interruption in the reception of a carrier frequency modulated information code sequence.

A device for control of electronic products containing an analog-to-digital Converter, the output unit of the control, measuring the coefficient of mutual differences, measuring the threshold values of the coefficient of mutual differences, the unit of measurement of the ratio of signal energy to the spectral density of the noise, the comparator (see speaker of the Russian Federation No. 2071107, CL 6 G 05 In 23/02, 1996).

The disadvantage of this device is the inability to control the quality of the communication lines of the data transmission channel due to the necessity of forming the test reference signal driver reference signal at a specific known code structure that real time is impossible in the absence of any information about the code structure of the modulated signal from the communication line of the data transmission channel.

The purpose of the invention is to apply for a new purpose known device for quality control of the communications lines of the data transmission channel.

To achieve this goal in a device for quality control of channel p is passing data containing measuring the coefficient of mutual differences (ICVR), analog-to-digital Converter, a comparator, measuring the threshold values of the coefficient of mutual differences, the unit of measurement of the ratio of signal energy to the spectral density of the noise output unit of the control inputs of the modem, the element OR the element OR NOT, trigger, group lines delay delay element, group of elements And, moreover, the output and the input of the modem from the line are input devices and connected respectively to the output in parallel to the inputs of the multiplier, phase shifter, normalizing unit measuring CWR and to the input unit of measurement of the ratio of signal energy to the spectral density of the noise, and the entrance is through a delay element in parallel to the inputs of the multiplier products meter CWR, a parallel output of the demodulator of the modem connected to the computer input, to the inputs of the OR element and to the inputs of the element OR NOT, and each contact of the parallel output of the demodulator of the modem is connected to one input of the corresponding element from the elements And to the other inputs of which are connected in parallel to the trigger output setting input of which is connected to the OR gate's output and fault input trigger to the output of the element OR NOT, the output of which is also connected to the inputs of the integrators, the gate unit measuring CWR, the output of each is about a item And group elements And connected to the corresponding contact of the parallel input of the modulator of the modem and to the computer, the output register is connected to the second input of the meter threshold values of the coefficient of mutual differences, to the third input of which is connected to the output of the unit measurement of the ratio of signal energy to the spectral density of the noise, and the meter output threshold value of the coefficient of mutual differences connected to the second input of the comparator to the first input of which is connected to the output of the meter CWR, the outputs of the comparator are connected in parallel to the power output of the control.

The drawing shows a functional electric diagram of the device.

Device for quality control of the data channel contains the modem 1, consisting of a demodulator 1.1 and modulator 1.2, measurement of the coefficient of mutual differences (ICVR) 2, the group of items 3.1-3.n (number of elements n is determined by the number of the information contact of the parallel input of the modulator 1.2 modem 1), item, OR 4, the element OR NOT 5 trigger 6, register 7, the unit of measurement of the ratio of signal energy to the spectral density of the noise 8 (USSR author's certificate No. 1001489, CL N 04 3/46), measuring the threshold values of the coefficient of mutual differences 9, the comparator 10 block output control 11, the analog-to-digital Converter 12, a group of delay lines 25.1-25.n, delay element 26, and a parallel output of the demodulator 1.1 modem 1 under the offline to the input of the computer, to the inputs of the OR element 4 and to the inputs of the element OR NOT 5, and each contact of the parallel output of the demodulator of the modem through the respective delay lines 25.1-25.n connected to one input of the corresponding element from the group of elements And 3.1-3.n, to the other inputs of which are connected in parallel the output of the trigger 6, which is also connected to one input element And 20 meter threshold values of the coefficient of mutual differences 9. Installation input trigger 6 is connected to the output element OR 4, and the vertical input of the trigger 6 is connected in parallel to the output of the element OR NOT 5, the inputs of the integrators 15.1, 15.2, entrance gate unit 18 for measuring the coefficient of mutual differences 2. The output of each element And of the group elements And 3.1-3.n connected to the corresponding information contact the parallel input of the modulator 1.2 modem 1 and to the output of the computer. The output of the normalizing unit 19 for measuring the coefficient of mutual differences 2 connected to the input of analog-to-digital Converter 12, the output of which is connected to the first input of the comparator 10, to the other input of which is connected to the output of the divider 24 meter threshold values of the coefficient of mutual differences 9, and the outputs of the comparator (And>In), (a=b), (A<B) is connected to the unit outputs the control 11. The output of the register 7 is connected to the second input element And 20 meter threshold meant what I coefficient of mutual differences 9. The input lines of communication demodulator 1.1 and the modulator output 1.2 in the communication line modem 1 are the inputs of the claimed device and connected: input line communication demodulator 1.1 through delay element 26 in parallel to the inputs of the multiplier products 14.1, 14.2 meter coefficient of mutual differences 2, and the output of the modulator 1.2 in the communication line to another input of the multiplier 14.1, the input of the phase shifter 13, the first input of the normalizing unit measuring the coefficient of mutual differences 2 and the input unit of measurement of the ratio of signal energy to the spectral density of the noise 8, the output of which is connected to the first input of the divider 24 meter threshold values of the coefficient of mutual differences 9. In ICVR 2 includes two multiplier 14.1, 14.2, futurewater 13 performing the Hilbert transform of the signal output from the modulator 1.2, two integrator 15.1, 15.2, two Quad 16.1, 16.2, the adder 17, the gate unit 18 and the normalizing unit 19, and the output of the phase shifter connected to the second input of multiplier 14.2, the outputs of the multiplier products 14.1, 14.2 are connected respectively to the inputs of the integrators 15.1, 15.2, the outputs of which are connected respectively to the inputs of the Quad 16.1, 16.2, the outputs are connected to the inputs of the adder 17, the output of which is connected to the second input gate unit 18, the output which is connected to the second input of the normalizing unit 19. The meter peregovorochnaya coefficient of mutual differences consists of item And 20, doubler 21, Quad 22, logarithmorum device 23, a divider 24, connected in series.

The principle of the proposed device is based on the transition from a differentiated analysis of the forms and parameters of the line signals to the integrated analysis of the properties of these signals. Simple differential parametric analysis of signals with quadrature amplitude modulation shows that the number of parameters characterizing the quality of the generated signals, the modulated multilevel quadrature phase modulation between 20 (minimum number of combinations in the codes of Trellis) to 66 (32 combinations). Moreover, the deviation for a particular parameter, such as the instability of the carrier frequency or the instability amplitude, can cause distortion of all combinational components. The use of traditional methods of parametric control is very problematic due to the high time and hardware costs, and parametric control of such a large set of parameters is impossible in real time.

On the communication line of the communication channel can affect the external destabilizing factors, such as additive and multiplicative noise due to electromagnetic incompatibility between the data channel and the external electromagn time devices performing electromagnetic radiation in a wide frequency range. Despite reliable shielding of the cable, external electromagnetic fields affect the shape of the transmitted signal. Also in the communication channel can be distorted signal due to unauthorized access and attempts to read information. The received signal from the communication channel enters the modem at the receiving side of the communication system, and performing the additional function of driver reference of the received signal, since the modem is an active element, i.e. in addition to passive filtering and transmission of digital information input to the computer, it carries out demodulation signal and restoring the original digital sequence with standard values of the amplitudes, velocities and phases of the transmitted signals.

The device operates as follows. Passing through the communication line, the modulated information signal after receiving-amplifying points intermediate switching devices undergoes distortion due to the influence of the external environment distribution (lines)resulting in unauthorized access to a communication line, the apparatus distortion, etc. the Computer is running in simplex mode, that is, until we adopted the frame of the communication channel, the computer to transfer your info is with respect to the frame in the communication channel will not. Prior to starting work, in the register 7 is set to the probability of erroneous reception element signal ROshprovided technical condition on the monitored channel. Automatic cycle control is performed at the time of admission to the input of the demodulator 1.1 modulated signal from the communication line. Modulated distorted information signal from the communication line Sk(t) to the input of the demodulator 1.1, where it is demodulated, i.e. the carrier frequency, modulated specific information pulse code sequence using one of the modulation types (e.g., multi-level quadrature modulation), is converted into a sequence of rectangular signals, from the output of the demodulator 1.1 incoming parallel code on the computer input. At the same time parallel signal at the inputs of the elements, OR 4, OR 5 and through a delay line 25.1-25.n on the input elements And 3.1-3.n. In this case, the output of the element OR NOT 5 is formed by a logical “0”and the output of the OR element 4 is formed by a logical “1”which is supplied on the installation log trigger 6, thus providing at its output a logical “1”which is fed to the second inputs of elements And 3.1-3.n and the first input element 20. Delay lines 25.1-25.n delay parallel demodulated C is cash at the end of the transition installation processes in the elements OR 4, OR-NOT 5, the trigger 6. Parallel code signal through the delay line 25.1-25.n is supplied to the first inputs of elements And 3.1-3.n., passes through them and is supplied to the parallel input of the modulator 1.2. Modulator 1.2 modulates the coded signal, which can be considered the reference Se(t), as he had not yet felt the impact of negative environmental factors distribution (lines). Output lines of communication and with the input of the demodulator 1.2 controlled signal S(K) is fed through a delay element 26 to the first inputs of the multiplier products 14.1 and 14.2. Delay element 26 delays the signal Sk(t) on the time required for completion of the transition process in the demodulator 1.1, elements, OR 4, OR 5, the trigger 6, the elements And 3.1-3.n, the modulator 1.2. From the output of the modulator 1.2 Se(t) is supplied to the second input of the multiplier 14.1 directly and through the phase shifter 13, providing signal coupled by Hilbert with arriving at its input signal to the second input of the multiplier 14.2. The results of the multiplication with the output of multiplier products 14.1, 14.2 arrive at the signal inputs of the integrators 15.1, 15.2, where the integration on the interval of time equal to the duration of a modulated code sequence. From the outputs of the integrators 15.1, 15.2 signals arrive at the inputs of the Quad 16.1, 16.2, and then their outputs to corresponding inputs of summat the RA 17. From the output of the adder 17, the signal is sent to an information input gate unit 18, the control input of which is at the end of the receiving code sequence demodulator 1.1 output of the element OR NOT 5 start-formed logical unit is a signal Gating and this logical "1" is supplied to control inputs of the integrators to reset them to zero state. Output Gating unit 18, the signal received at the input of the normalizing unit 19 consisting of a power meter reference signal Se(t) and voltage divider (not shown, in accordance with the prototype, see speaker of the Russian Federation No. 2071107, CL 6 G 05 In 23/02, 1996), to another input of the normalizing unit 19 receives the reference signal Se(t). At the output of the normalizing unit 19 will be present voltage, representing the result of measurement of the coefficient of mutual differences of the monitored signal sk(t) at the input of the demodulator 1.1 from the communication line and the reference signal Se(t) at the output of the modulator 1.2 in the communication line, described by the following expression:

where Sk(t), Se(t) - time functions that define the structure, respectively, of the controlled and reference signals;

S

(t) is a function of time, coupled by Hilbert with Se(t);

Pe- power reference signal;

T - the duration element of the reference signal.

The measurement result is g=G output from the normalizing unit 19 for measuring the coefficient of mutual differences 2 is supplied to the information input of the analog-to-digital Converter 12, where the voltage magnitude G, converted into digital form, is fed to the first input of the comparator 10. From the output of the register 7 is supplied previously set value POshto the second input element And 20, at the first input of which receives an enable signal from the output of the trigger 6. With the output element And 20 P valueOshto the input of the doubler 21, doubler 21 P valueOshdoubles and from the output of the doubler 21 to the input of the Quad 22, where squaring the doubled value of POshwith the release of the Quad 22 the resulting value is fed to the input of the logarithmic device 23, the output of which the signal at the second input of the divider 24, at the first input of which receives the signal, determines the value of h2from the output of the unit measurement of the ratio of signal energy to the spectral density of the noise (h2).

At the output of divider 24 will be present code combination representing the result of measuring the threshold value KBP for this ver is arnosti error P Oshthe investigated channel g=Gthen=ln(2PSS)2/h2.

From the output of divider 24 is gthensupplied to the second input of the comparator 10 compares the values of g and gthen. Depending on the result of g>gthen, g<then, g=gthenin one of the three respective outputs of the comparator 10 will be a unit, which is fed to one input of block 11 output control (for information display “Rating: good, Rating: limit value”, “Rating: worthless”). The decision that set the serial communication parameters that determine the value of the coefficient of mutual differences of g is normal or not normal, and the sum of deviations of the values of these parameters from their nominal values does not give the probability of error greater than, less than or equal to the specified value.

The technical result consists in obtaining the coefficient of mutual differences between the controlled and reference signals as a comprehensive indicator of the quality of the communication line of the data transmission channel, and as a source of reference signal is not a single driver test reference signal at a specific known code structure, and part of the modem, which greatly simplifies the automation of process control, allows the rowedit the nonparametric control in real time without the use of a set of complex, expensive instrumentation, and in the absence of any information about the code structure modulated the signal received from the communication lines of the data transmission channel.

The disadvantage of this device is the inability to control the quality of the communication lines of the data transmission channel due to the necessity of forming the test reference signal driver reference signal at a specific known code structure that real time is impossible in the absence of any information about the code structure of the modulated signal from the communication line of the data transmission channel.

The use of this device allows to increase the reliability of the control data transmission channel, as the index g in the proposed case, quantitatively determines the compliance of the technical condition of the communication line to transfer information from a given or smaller probability of error. Adverse economic effect is the reduction of time and hardware costs to assess the quality of the channel, as if CWR is below the threshold, there is no need to measure each individual parameter from the entire set of parameters characterizing the quality of the communication line of the data transmission channel.

Device for quality control of lines of communication channel data containing measuring the coefficient of mutual differences (ICVC), in which the output of the phase shifter and the measurer of the CVR is connected to the second input of the second multiplier meter CVR, the outputs of the first and second multiplier products meter CVR connected respectively to the inputs of the first and second integrators meter CVR whose outputs are connected respectively to the inputs of the first and second Quad meter CVR, the outputs of which are connected respectively to the inputs of the adder meter CVR, the output of which is connected to the second input of the Gating device meter CVR, the output of which is connected to the second input of the normalizing unit measuring CVR, analog-to-digital Converter, a comparator, measuring the threshold values of the coefficient of mutual differences, consisting of series-connected element And the doubler, Quad, logarithmorum device and the divider unit of measurement of the ratio of signal energy to the spectral density of the noise output unit of the control, and the output unit of measurement of the ratio of signal energy to the spectral density of the noise is connected to one input of a comparator whose outputs are connected to the input block output control, characterized in that it further introduced the modem, the element OR the element OR NOT, trigger, group lines delay delay element, group of elements And, moreover, the output and the input of the modem from the line are input devices and connected respectively to the output in parallel to the inputs of the first Peremoga the La, Phaser and normalizing unit measuring the ICC and to the input unit of measurement of the ratio of signal energy to the spectral density of the noise, and the entrance is through a delay element in parallel to the inputs of the first and second multiplier products meter CVR, a parallel output of the demodulator of the modem connected to the computer input, to the inputs of the OR element and to the inputs of the element OR NOT, and each contact of the parallel output of the demodulator of the modem connected through the respective delay line to one input of the corresponding element from the elements And to the other inputs of which are connected in parallel to the trigger output setting input of which is connected to the OR gate's output and fault input trigger to the output of the element OR NOT, the output of which is also connected to the inputs of the first and second integrators unit measuring the ICC, the gate unit measuring the ICC, the output of each element And of the group elements And connected to the corresponding contact of the parallel input of the modulator of the modem and to the output of the computer to output the trigger signal at the first input element And measuring the threshold values of the coefficient of mutual differences, to the second input of which receives the signal from the output of the register to the first input of the divider meter threshold values of the coefficient of mutual difference signal from the output of the measurement unit against the Oia energy signal to the spectral density noise from the output of the divider meter threshold values of the coefficient of mutual differences of the signal at the second input of the comparator, the output of the normalizing unit measuring CVR signal is supplied to the information input of the analog-to-digital Converter, and the converted signal is supplied to the first comparator input.



 

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