SU1520537A1 - Device for modeling radio communication systems - Google Patents

Abstract

The invention relates to computing and can be used to simulate the process of transmitting digital information over a radio link. The purpose of the invention is to improve the accuracy of the simulation by reproducing the mode of changing the distance between the transmitter and receiver. The device contains a message generator, two counters, the element And, the element NOT, the display unit, the generator of white noise, the integrator, a comparator, a variable resistor. 1 il.

Description

The invention relates to computing and can be used to simulate the process of transmitting digital information over a radio link.

The purpose of the invention is to improve the accuracy of the simulation by reproducing the mode of changing the distance between the transmitter and receiver.

The drawing shows a diagram of the device.

The device contains 1 message generator, And 2 element, 3 transmitted messages counter, indication block 4, correctly received messages counter 5, white noise generator 6, integrator 7, comparator 8, NOT element 9, variable resistor 10, power source 11.

The device works as follows.

Before the device starts operating, the installation inputs of counters 3 and 5 receive a control signal that nulls these counters. Generator 1 generates pulses that simulate a sequence of characters arriving at the first input of an AND 2 element (into the communication channel). The number of pulses at the output of the generator 1 is counted by the counter 3 and is displayed by means of the display unit 4. The white noise generator 6 is designed to simulate the effect of broadband interference on a radio channel,

moreover, the noise voltage from the output of the generator 6 white noise comes

to the input of the integrator 7, on which the white noise envelope voltage is formed, which is continuously fed to the input of the comparator 8, to the second input of which a constant voltage (comparator triggering voltage) and the trigger level at the output of the comparator 8 is formed random sequence

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with:

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and emulsions that are inverted by the HE element 9 and fed to the second in (ld element AND 2. Thus, if the noise level is greater than or equal to the trigger level of the comparator, then the control signal from the output of the HE element 9 prevents the signal from passing through AND 2. If the noise level is below the trigger level of the 11th channel, then the signals through the And 2 element are fed to the input of the right- pH JibHo received counter, messages 5. The number of correctly received pulses is displayed by the block 4 of the indicator. torus 10 are set different levels of actuation comparator that allows to model the change of the distance between peredatchi- and one receiver,

(invention formula

A device for simulating radio communications, contains; its message generator, element I, the transfer counter of these messages, the display unit, the counter of correctly received messages, the output of the message generator

connected to the first inlet of the signal source and the information input of the transmitted messages, the output of which is connected to the first input of the display unit, the output of the AND element is connected to the information input of the correctly received messages, the output of which is connected to the second input of the display unit, and the installation input The transmitted message counter is connected to the installation input of the correctly received message counter and is the device installation input, characterized in that, in order to improve the modeling accuracy, The white noise generator, power source, integrator, comparator, NOT element and the unit for modeling the change in the distance between the transmitter and the receiver are made in the form of a variable resistor, the output of the white noise generator is connected to the integrator input, the output of which is connected to the first comparator INPUT, output which element is NOT connected to the second input of the element I, the second input of the comparator is connected via a variable resistor to the output of the power source.

Claims (1)

Claim A device for simulating these 25 radio communication topics, comprising a message generator, an And element, a transmitted message counter, an indication unit, a correctly received message counter, the output of the message generator ed being connected to the first input of the And element and the information input of the transmitted message counter, the output of which is connected to the first input of the display unit, the output of the And element is connected to the information input of the counter of correctly received messages, the output of which is connected to the second input of the display unit, and the installation input is counter and the transmitted message is connected to the installation input of the counter of correctly received messages and is the installation input of the device, characterized in that, in order to increase the simulation accuracy, a white noise generator, a power source, an integrator, a comparator, an element NOT and a distance change simulation unit are introduced into it between the transmitter and the receiver, made in the form of a variable resistor, and the output of the white noise generator is connected to the integrator input, the output of which is connected to the first (Comparator input, output to orogo through element is coupled to the second input of the AND gate, the second input of the comparator via the variable resistor is connected to the output of the power source.