SU1695522A2 - Device for determination of performance of channels of discrete information transmission - Google Patents

Description

one

(61) 1358105

(21) 4773318/09

(22) 12.25.89

(46) 11/30/91. Bul No. 44

(72) E.P.Valyuzhinich and N.A.Trihonyuk

53) 621.396.664 (088.8)

(56) USSR Copyright Certificate No. 1358105, cl. H 04 L 12/26, 1986.

(54) DEVICE FOR MEASUREMENT OF QUALITY OF TRANSMISSION CHANNELS OF DISCRETE INFORMATION

(57) The invention relates to a radio communication technique. The purpose of the invention is to increase

validity of measurement. A block 26 for analyzing the statistical characteristics of noise, an additional threshold block 27, and element 28 are entered into the device. This set of blocks allows determining the type of interference distribution at the input of the monitored terminal equipment 29, by which it is possible to further refine the measurement result and thereby increase the reliability those. reach the goal. Given the option block 26 analysis of the statistical characteristics of noise. 1 hp f-ly, Zil.

Fig 1

ON About SL SP

yu yu

Yu

The invention relates to a radio communication technique and can be used for automated control of the quality of discrete information transmission channels and is additional to auth. St. No. 1358105.

The purpose of the invention is to increase the reliability of the measurement.

FIG. Figure 1 shows the structural electrical circuit of the proposed device; in fig. 2 - analyzer circuit; in fig. 3 - block analysis of the statistical characteristics of noise.

The device for measuring the quality of transmission channels of discrete information contains (Fig. 1) the signal-to-noise ratio meter 1, the input signal simulator 2, the first switch 3, the valve 4, the analyzer 5, the error determination unit 6, the switch 7, the first counter 8, the OR element 9 , measuring receiver 10, prohibition block 11, amplitude detector 12, first threshold unit 13, shake signal generator 14, second key 15, limiter 16, frequency detector 17, voltmeter 18, first indicator 19, third key 20, second threshold unit 21, the fourth key 22, the second counter 23, ormirovatel slot 24, second indicator 25, the block 26 the analysis of statistical characteristics of noise, the additional threshold unit 27, AND gate 28 also shows terminal equipment 29.

The analyzer 5 contains (FIG. 2) the correlator 30, the switch 31, the recording unit 32, the time interval imaging unit 33, and the modulo 34.

The noise statistics analysis unit 26 contains (FIG. 3) the first key 35, the noise average value determining unit 36, the divider 37, the memory unit 38, the threshold unit 39, the modulator adder 40 two, the noise mean square value unit 41 second key 42.

The device works as follows.

If there is no clogging signal at the output of the driver 14, the signal is absent (Fig. 1), the second key 15 is closed, and the prohibition unit 11 is in the open state, the output of the signal-to-noise ratio meter has a voltage equal to U s) n at first

ULU

indicator 19 displays the ratio d0. When interference occurs at the output of the first threshold unit 13, a voltage appears along which the driver 14 issues a signal to drive, the second key 15 is open, and

prohibition unit 11 is in the closed state. The limiter 16 has a limiting level equal to the maximum possible signal amplitude, therefore

its output, an interference signal appears on the frequency detector 17, which determines the frequency of the interference, which is displayed by the first indicator 19, together with the block signal,

0 The monitoring of the measuring receiver 10 is carried out as follows.

If there is no clogging signal at the output of the imaging unit 14, O is present. If the receive paths are faulty, the signal-to-noise ratio is below the threshold and the output of the second threshold unit 21 is 1. The fourth key 22 is open and 1, indicating a faulty receive path, is displayed on the second health indicator 25, as an executive team The receive path is faulty. Otherwise, the receive command is displayed. The receive path is healthy. If the clogging signal is present at the output of the deformer 14, then the display of the executive commands on the second indicator 25 is not performed until the clogging signal disappears (i.e., the receiving device is reset to the spare

0 frequency).

The control of the terminal apparatus 29 is carried out as follows.

In the absence of a signal to drive down at the output of shaper 14 and with good

5, the reception path of the third key 20 is open. The second counter 23 calculates the errors of the terminal equipment 29 for the time interval specified by the shaper 24. If the number of errors exceeds the established value, the output of the second counter 23 is 1, which is displayed as an executive command. The terminal equipment is operational. Otherwise, on the second indicator 25, the End hardware command is displayed. In the presence of a clogged signal or a malfunction of the receiving path, the display of the executive commands is not performed until the signal

0 faults will not disappear or the receive path will not be restored. In the absence of a useful signal of the correspondent, the output of block 32 (Fig. 2) is a signal 1, which starts the driver 33 in5 time limit. The duration of the time intervals of the imaging unit 33 is selected based on the reliability of the statistical analysis of the characteristics of the noise acting in the communication channel and is chosen 1-2 seconds. In addition, 1 from the output of block 32 enters

the control input of the first key 35 of the block 26 (FIG. 3) opens it. The noise from the output of the open prohibition block 11 is fed to the inputs of the block 41 for determining the rms noise value o. As the block 41, you can use a quadratic voltmeter VZ-3, VZ-6. In addition, the noise is fed to the input of the unit 36 for determining the average direct noise value hsr.v .. As the unit 36, you can use a voltmeter with a full-wave rectifier VZ-10. The values of ai xcr.v are fed to the input of the divider 37, the output of which

the value of K1, where K is the coefficient of X.

The form of noise distribution. The value Kf is written to the memory unit 38.

Additional threshold unit 27 is designed to record a noise level such that US / USH 1, where vc is the minimum possible signal level of the correspondent, as determined by its sensitivity. For example, for a decameter radio receiver Р-155МР in mode ЧТ-125 vc 0.3 mV. If the noise level at the output of the prohibition block 11 exceeds the minimum possible signal level of the correspondent, then the output of the additional threshold block is signal 1, which is fed to the first input of the adder 40 modulo two. After the time interval for analyzing the statistical characteristics of noise expires, a signal 1 is present at the output of the time interval imaging unit 33, which is fed to the second input of the adder 40. In this case, the output of the adder 40 is signal O, which polls the memory unit 38, and the value Kf is input to the threshold block 39, where it is compared with K f 1.25 for a normal noise distribution law. When K1f and Kf coincide, the output of the threshold block 39 will be a signal O, which is displayed on the second indicator 25 as an executive command. OA information reliability. Otherwise, the output of the threshold unit 39 will be a signal 1, which is displayed on the second indicator 25 as an executive command OA Information Failure. This signal is fed to the input of the element And 28, to the other input of which receives the signal O - Reception path is healthy. At the output of element 28, signal 1 closes the third key 20, preventing the passage of the signal. The terminal equipment is faulty to the input of the second indicator 25. When the signal of the correspondent appears at the output of block 32 there will be a signal O, which is fed to the second input of the time signature 33, stopping it

work. The first key 35 is closed, preventing the passage of noise to the input of blocks 41 and 36, and the second key 42 is opened. The signal 1 from the output of the adder 40 (this signal came from the second threshold of block 21) is received through the open second key 42 to the input of the second indicator 25 where it is displayed as an executive score. The OA control is unreliable,

0 Further, at the end of the time of analyzing the statistical characteristics of the noise at the output of the shaper 33, a signal 1 is received, which is fed to the input of the adder 34. The output of the adder 34 shows a signal 1, which opens the first key 3 (Fig. 1) and using the switch 31 (FIG. 2) connects the output of the measuring receiver 10 (FIG. 1) to the correlator 30. The signal of the simulator 2 is fed through the open first switch 3 and the valve 4 to the input of the measuring receiver 10.

Valve 4 is designed to prevent the information signal from entering the simulator 2 circuit. With a healthy

5, the reception path at the output of the second threshold unit 21 is present O, the second indicator 25 forms the executive command. The reception path is healthy, otherwise the Path command is formed.

0 reception failed. The error determination unit 6 determines the number of errors of the terminal apparatus 29. At the output of the correlator 30 (Fig. 2, a signal O is generated corresponding to the coincidence of the signals on

5 of its first and second inputs. The signal O is fed to one input of the adder 34, to another its input from the block 32 of the registration of the signal of the correspondent receives a signal 1. As a result, the adder 34 of the analyzer

0 5 (Fig. 1) sends a signal to the switch 7, which switches the output of the block 6 error determiner to the input of the first counter 8. The first counter 8 performs the error counting of the terminal equipment 29 during the time interval set by the driver 24 time intervals, When the terminal is operational the equipment 29 at the output of the first counter 8 is formed a signal which, passing through the element

0 OR 9 and the third key 20, forms the executive command. Terminal equipment is operational.

When the signal of the correspondent appears at the output of the correlator 30 (Fig. 2), the signal 1. corresponding to the mismatch of the signals at its inputs appears. The signal V is fed to the input of the adder 34, to the other input of which signal 1 is sent. At the output of the adder 34, O appears, which closes the first key 3 and switches the output of the error determination unit 6 to the input of the second counter 23.

Claims (2)

Claim 1, Device for measuring the quality of channels for transmitting discrete information by author. St. No. 1358105, characterized in that, in order to increase the reliability of the measurement, the output of the prohibition unit is connected to the additional input of the second indicator through the additional threshold block entered and sequentially connected, and the statistical analysis of the noise characteristics, the second output of which is connected to the second input of the second indicator, the control input of the noise analysis of statistical characteristics is connected to the first additional output of the analyzer, the second and third inputs of the analysis of the statistical characteristics of noise are connected The data are transmitted to the control input of the third key through an input element I, the second input of which is connected to the first output of the analysis of statistical noise characteristics. 2. A pop-up device, 1, characterized in that the block for analyzing statistical noise characteristics comprises a first key connected in series, a block of determining the average free noise, a divider, a memory block and a threshold block, a block of determining the root-mean-square noise value, an input and the output of which is connected respectively to the output of the first key and the second input of the divider, modulo two adder, the output of which is connected to the interrogation input of the memory unit, the second key, the first and second inputs of which are connected respectively to the input The control of the first key and the output of the modulo-two adder, the control input of the first key is connected to the control input of the memory unit, the control input and the information input of the first key are respectively the control input and the third input of the statistical noise characteristics analysis unit, the first and second the inputs and the first and second outputs of which are, respectively, the first and second inputs of the modulo two adder and the outputs of the threshold unit and the second key. FIG. 2 From the output of block 11 From the output of block 32 5l on JJ From the output of block 21 Fig.Z