SU1651292A1 - Communication systems simulator - Google Patents

Abstract

The invention relates to computing and is intended to simulate communication modes in the conditions of interference. The purpose of the invention is to expand the functionality by simulating the effects of simulation interference. To do this, a trigger, a pulse counter and an interfering unit containing a controlled delay line, two generators, are introduced into the device. random sequence of pulses, the element And and the element OR. The introduction of these blocks and elements allows us to simulate the process of functioning of the communication system in the conditions of simulated interference. 2 yl

Description

The invention relates to computing and is intended to simulate communication modes in terms of interference.

The purpose of the invention is to enhance the functionality by simulating the effects of simulation interference.

Figure 1 shows the functional diagram of the device; Fig. 2 is a functional block diagram of the formation of interference.

The device contains a generator of 1 pulses, the element And 2, the first 3 trigger, the second 4 trigger, the first 5, second 6, third 7 and fourth 8 pulse counters, block 9 of the display, generator 10 of a random sequence of pulses, the element is NOT 11. the third 12 trigger, a fifth pulse counter 13; and an interfering block 14 comprising a controllable delay line 15, a first random pulse generator 16, AND 17, a second random pulse generator 18, and OR 19 element.

The device works as follows.

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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 of the messages is presented (repeated) in it K times. The number of pulses received at the output of the pulse generator 1 is counted by a pulse counter 7. Counter 6 and trigger 4 are designed to simulate an initial sequence of messages in which each message is transmitted only once. The multiplicity of message transmission K is set by changing the volume of the counter 6. For the K-multiple transmission, its volume is set equal to the number (K - 1). The pulses from the output of the pulse generator 1 are fed to the first input of the trigger 4 and the input of the counter 6. The trigger 6 is set to

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zero state. When the K-th pulse arrives at the input of the counter 6, the content of the latter is a number (K-1). Counter 6 is zeroed out, and at its overflow output a signal arrives at the input of trigger 4, which is set to one state. At the output of trigger 4, a pulse appears imitating the message of the original flow. This pulse is fed to the input of the trigger 3 and to the input of the counter 8, which counts the number of pulses received at its input,

The generator 10 of a random sequence of pulses, the element NOT 11 and the element And 2 are designed to simulate the flow of errors that occur in the communication channel. At a random moment of occurrence of a pulse with a random pulse flow duration at the output of the generator 10, a signal appears at the control input of the AND 2 element that prohibits the passage of pulses from the output of the generator of 1 pulses arriving at the information input of the AND 2 element. Thus, the distortion (loss ) messages in the process of transmission over the communication channel.

If the pulse from the output of the generator 10 of a random sequence of pulses does not arrive, then a signal for information transmission is sent to the control input of the AND 2 element.

The trigger 3 is designed to simulate the processing of messages on the receiving side of the communication channel. A pulse from the output of the trigger 4, which arrives at the second input of the trigger 3, sets it to the zero state. From the output of the AND 2 element, the first input of the trigger 3 receives an impulse simulating a message received without error. The trigger 3 is set to one state, and at its output a pulse arrives at the input of the pulse counter 5, a simulation message received without error on the receiving side.

It should be noted that, irrespective of the number N (N K) of correctly received messages of one message, only one impulse arrives at the input of the first counter 5, c. When (all the parcels of one message with multiplicity K were distorted during transmission over the communication channel), the pulse does not arrive at the input of the first counter. 8 random moment of the presence at the output of the controlled line 15 of the delay of the delayed pulses of the previous message and of the output of the second generator 18 of the random sequence of pulses of the enabling mm pulse; the delayed pulses arrive at the second input of the element OR 19, forming at its output the pulses of the false message, imitation interference, establishing the third trigger 12 in one state in the absence of the output of the first trigger

3 message pulses received without error at the receiving side. At the output of the third trigger 12, a pulse arrives at the input of the fifth counter 13

pulses, the simulator received messages on the receiving side, distorted by simulated interference, the outputs of the 5.7 counters and 8 pulses are connected to the corresponding inputs of the display unit 9

parameters of the simulated process.

Claims (1)

Claims An apparatus for modeling communication systems comprising a pulse generator element I, four pulse counters, two triggers, display unit, generator of a random sequence of pulses, the element is NOT, the output of the pulse generator is connected to the first input of the element I, the output of which is connected to the single input of the first trigger, the output of which is connected to the counting input of the first pulse counter, the output of the pulse generator is connected to the counting inputs The second and third pulse counters, the zero input of the second trigger, the output of which is connected to the counting input of the fourth pulse counter and to the single input of the first trigger, the output of the second counter pulses connected to a single input of the second trigger, the output of the first, third and fourth pulse counters is connected to the corresponding information input of the display unit, the generator output A random sequence of pulses is connected through the element NOT to the second input of the element AND, characterized in that. In order to extend the functionality by simulating the effects of simulated interference, a third trigger, a fifth pulse counter and an interfering unit, containing a controllable delay line, two random pulse generators, the AND element and an OR element, were introduced into the device; the input of the controllable delay line and the first input of the OR element are combined and are the input of the noise generating unit; the output of the first generator of a random sequence of pulses Connected to the control input of a controllable delay line, the output of which is connected to the first input of an AND element, the output of the second generator of a random sequence of pulses is connected to the second input of the AND element, the output of which is connected to the second input of the OR element, the output of which is this output of the second trigger is connected to the zero input of the third trigger, the output of which is connected to the counting input of the fifth pulse counter, the output of which is connected to the corresponding information input of the Display indication, the output element And connect to the input block of the formation of interference, the output of which is connected to a single input of the third trigger. eleven Bxoff ttt- is & Mr.-Dedi-gyuvnldads-dZiAshMSHI L 15 Editor N. Petrash Thebes. 2 Compiled by I. Konkevich Tehred M. Morgental 14 P 73 - Vshod sixteen Proofreader N. Shevkun