SU1633419A1 - Communication system simulator - Google Patents

Description

(21) 4663067/24

(22) 03/15/89

(46) 03/07/91. Bul № 9 (72) S. V. Kalinin and E. A. Tretkov (53) 681.3 (088.8)

(56) USSR Author's Certificate No. 805331, cl. G 06 F 15/20, 1979. USSR Copyright Certificate No. 1059577, cl. G 06 F 15/20, 1983

(54) DEVICE FOR MODELING THE COMMUNICATION SYSTEM

(57) The invention relates to computing and communication technology and can be used to simulate the operation of a communication system with different modes. The purpose of the invention is to expand the functionality by simulating the process of receiving repeated messages. The goal is achieved by introducing into the device the first and second impreaters pulse count, trigger and delay element. The essence of the invention is that the device allows you to simulate the process of receiving a repeated message in wi x 1 noise yl

The invention relates to computing and communication technology and can be used to simulate the operation of a communication system in various modes.

The purpose of the invention is to expand the functionality of the device by simulating the process of receiving ia repeated messages.

The drawing shows a diagram of the device.

The device contains a pulse generator 1, the first pulse counter 2, the second pulse counter 3, the third pulse counter 4, the fourth pulse counter 5, the second trigger 6, the first trigger 7, the fifth pulse counter 8, the first driver 9 pulses, the second driver 10 pulses, element II, element NOT 12, generator 13 of a random stream of pulses, display unit 14, delay element 15

The device works as follows

The pulse generator 1 generates a sequence of pulses that simulates a sequence of messages arriving on the communication channel. This sequence is similar to the original message flow, but each message is presented (repeated in it) K times. The number of pulses received at the output of the pulse generator 1 is counted by counter 3

Pulse counter 2, pulse generator 9 are designed to simulate an initial sequence of messages where each message is transmitted only once. The transmission rate of messages K is determined by changing the volume of counter 2

For a K-fold transmission, its volume is set equal to the number K - 1. The pulses from the output of the generator 1 pulses arrive at the zero input of the trigger 7 and the input of the counter 2 The trigger is set to the zero state. When the K-th pulse arrives at the input of the counter 2, the contents of the counter are em K - I The contents of counter 2 are zeroed out, and at its output overflow a signal arrives at the input of the imager

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Impulses, which generates a pulse, which is supplied to the input of trigger 7, as a result of which trigger 7 is set to one state. At the output of trigger 7, a pulse appears that simulates a message of the initial flow. This pulse arrives at the input of counter 4 and the input of delay element 15, which provides a delay of this pulse for a time shorter than the period of the following pulses from the pulse generator 1. Counter 4 counts the number of pulses received at its input. The generator 13 is a random stream of pulses, the element is NOT 12 and the element is AND 11 are pre are designed to simulate the flow of errors occurring in the communication channel. At a random moment of the appearance of pulses at the first input of the element AND, a control signal appears that prohibits the passage of a pulse from the output of the generator I of pulses, which goes to the second input of the element 11. a distortion (loss) of the message is simulated during its transmission over the communication channel. If the generator does not receive a random pulse stream, then a signal is received at the first input of the element 11 that permits the passage of PULSES through the element HT and 1 January

Counter 8, pulse shaper 10 and trigger b are used to simulate the processing of messages at the receiving side and to establish the fact of reception

The impulse from the output of the element AND 1 1 goes to the input of count 8, the volume of which is set equal to M - 1, where M is the specified number, which determines the fact of receiving the message. When m arrives at the input of the counter 8, its overflow appears the signal that, through the pulse shaper 10, arrives at the single input of trigger L, the zero input of which receives impulses from the output of the element 11 and the counter 8 is zeroed with the arrival of each of them n ibca from the output of the delay element 15 im pulses at the output of the trigger 6 tie Messages that are counted expense Chick 5

The fact of reception of the message establishes with the correct reception of M PULS U (X) of the pings)

The outputs of the counters 3-5 are connected to the inputs of the display unit 13, which is intended to indicate the main parameters of the simulated process, respectively, the number of messages arriving on the communication channel K, the number of primary messages Nn the number, the fact of reception of which is established if they are correctly received a given number of times

Claims (1)

Invention Formula A device for simulating a communication system, comprising a pulse generator, first, second, third and fourth pulse counters, a first trigger, an AND element, a HE element, a random pulse generator, and a display unit, the output of the pulse generator connected to the counting inputs of the first and second counters pulses, with a zero input of the first trigger and the first inlet of the And element, the second input of which is connected to the output of the NOT element, the input of which is connected to the output of the random pulse generator, the output of the first trigger, Yuchen to the counting input of the third pulse counter, the output of which is connected to the first input of the display unit, the outputs of the second and fourth pulse counters are connected respectively to the second and third inputs of the display unit, characterized in that, in order to extend the functionality by simulating the process of repeating messages, it additionally contains the first and second pulse formers, the second trigger, the fifth pulse counter, the delay element, and the output of the first pulse counter is connected with the input of the first pulse generator, the output of which is connected to the single input of the first trigger, the output of which is connected to the input of the delay element, the output of which is connected to the reset input of the fifth pulse counter, the output of which is connected to the input of the second pulse shaper, whose output is connected to the single input the second trigger, the output of which is connected to the counting input of the fourth pulse counter, the output of the element And is connected to the zero input of the second trigger - ir j-QO J v P 01 Csj four( MIND T