SU605218A1 - Discrete information transmission channel simulator - Google Patents

Description

one

The invention relates to computing.

A device for simulating a digital signal transmission path is known, which contains a shift-feedback register, phase-pulse modulators, filters 1.

However, such a device does not allow modeling the nature of the change, for example, the amplitude values of each of the elements of the binary sequence.

The closest technical solution to the invention is a device for modeling discrete information transmission channels, comprising a clock source, the output of which is connected to the sensor inputs of random signals and a random pulse generator, a trigger and the first equivalence element 2.

The drawback of the device is the impossibility of modeling the likelihood characteristics.

The purpose of the invention is to enhance the functionality by studying noise immunity and improving accuracy in information transmission systems.

This is achieved in that the device contains second, third, and fourth equivalence elements, functional converters, OR elements, a comparison unit, and delay elements. A single output of a random pulse is connected to the first input of the first element OR, the input of the first delay element and to the control inputs of the first and second elements of equal value, the output of the nerve element of equal sign to the first input of the second element ILR1, the output of which is connected to the first input of the comparator, and the output of the comparison block is to the trigger input. The output of the second element is equally connected to the first input of the third element OR, the output of which is connected to the second input of the comparison unit, the zero output of the random pulse generator to the second input of the first OR element, the input of the second delay element and the control inputs of the third and fourth equivalence elements. The output of the third element of equivalence is connected to the second input of the third element OR, the output of the fourth element of equivalence to the second input of the second element R1LI, and the output of the first element OR to the control inputs of the first and second function converters, whose information inputs

5 are connected to the sensor outputs of random signals. The output of the first functional converter is connected to the information inputs of the second and fourth equivalent elements, the output of the second functional

Converter - to the information inputs of the first and third elements of equivalence.

The block diagram of the device is shown in the drawing.

It contains a source of 1 clock pulses, a generator of 2 random pulses, a sensor 3 of random signals, OR elements 4, 5, 6, functional converters 7, 8, equivalence elements 9-12, comparison block 13, trigger 14, delay elements 15, 16.

The operation of the device occurs as follows.

When the device is turned on at the moments of the arrival of clock pulses, the generator 2 randomly generates signals at its outputs (a sequence of ones and zeros is formed).

If the pulse is at the single output of the generator (a single bit of the random binary sequence transmitted to the channel is simulated), it goes to the control inputs of equivalence elements 9 and 12, and through the OR element 4 - to the control inputs of functional signal converters 7 and 8, to the informational inputs of which signals are supplied from the corresponding outputs of the sensor 3.

In addition, the impulses from the unit output of the generator 2 are passed through the delay element 15 to the output of the device.

When the generator generates 2 random pulses of zero bit of a binary sequence, the signal from the zero output of the generator is passed to the control inputs of the equivalence elements 10 and 11 and through the OR element 4 to the control inputs of functional converters 7 and 8, to the information inputs of which in this case Random signals g are added from the corresponding outputs of sensor 3.

In addition, the impulses from the zero output of the generator 2 pass through the delay 16 on the output of the device.

When there is a signal at the control inputs of the functional converters 7 and 8, random signals appear at their outputs corresponding to the signals at the outputs, for example, integrators of a coherent correlation receiver of binary signals. Depending on the type of conversion performed by the converters on a random signal g from the output of sensor 3 and on the distribution law of this signal, reception of discrete signals subject to interference in the channel of discrete signals by receivers of various types is simulated.

A random signal from the output of the functional converter 7 is fed to the information inputs of elements 9 and 10 of equivalence, and a random signal from the output of a functional converter 8 to the inputs of elements And and 12 of equivalence.

In the case of the formation of a signal at the unit output of the generator 2, this signal falls on the control inputs of elements 9 and 12

equivalence. Consequently, the signal from the output of the functional converter 7 iro-walks only through the element 9 of equivalence and through the element OR 5 sends to the input of the comparison unit 13, and the signal from the output of the functional converter 8 passes only through the element 12 of equivalence and through the element OR 6 is fed to another input block 13 comparison.

When a signal appears at the zero output of the generator 2 of random pulses, this signal arrives at the control inputs of elements 10 and 11 of equivalence. Therefore, in this case, the signal from the output of the functional converter 7 passes through the equal sign element 10 (and not through element 9, as in the previous case) and through the OR element 6 appears already at another input of the comparison unit 13, and the signal from the output

the functional converter 8 passes through an element 11 of equivalence and through the element OR 5 is fed to the input of the comparison unit 13. Comparison unit output signal corresponding to random output difference

comparator unit, corresponding to the difference of random signals at the outputs of the functional converters 7 and 8, is fed to the trigger input 14. If the magnitude of the signal fed to the trigger input is greater than

the magnitude of the response, then a signal appears at its single output, and, conversely, if the magnitude of the signal entering the trigger input is less than its response threshold, the signal is at its zero output.

The introduction of new elements and links between blocks provides increased accuracy in information transmission systems. In addition, the device allows to solve a number of research problems, in particular, when

the development of error protection devices and specialized devices designed to solve problems related to the study of robustness in data transmission systems.

Claims (2)

1. Authorship certificate USSR №292166, G 06G 7/48, 1969. 2. Authors' certificate of the USSR №326591, G 06G 7/48, 1970.