SU1078656A2 - Device for simulating noise - Google Patents

Abstract

DEVICE FOR IMITATION OF INTERFERENCE on the author.St. No. 919122, in order to reduce the simulation time of interference / the serially connected OR element and the pulse counter are entered into it, while the decoder digit's outputs are connected to the inputs of the OR element, the output of the pulse counter is connected to the setup, register input The corresponding output of the pulse distributor is connected to the counting input of the pulse counter, and the third output of the decoder is connected to the additional input of the register.

Description

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The invention relates to telecommunications and can be used to determine the noise immunity of data transmission equipment.

According to ocHOBHONfy avt.ev, no. 919122, a device for simulating interference is known, which contains a stochastic function converter, the inputs of which are connected to the corresponding outputs of a pulse distributor and two outputs - to the inputs of a code-time converter, the output of which is connected to the break modulator output via a band-pass filter, one input of which is a device input, serially connected register and decoder, the third output of the stochastic function converter being connected to one register input, the other whose input is connected to the output of the pulse distributor, one output of the decoder is connected to the corresponding input of the code-time converter, another output of the decoder is connected to another input of the break modulator, and the output of the register is connected to the corresponding input of the stochastic function converter Clj.

A disadvantage of the known device is a considerable investment of time.

The purpose of the invention is to reduce the time to simulate interference.

This goal is achieved by the fact that a device for simulating interference, containing a stochastic function converter, whose inputs are connected to the corresponding outputs of a pulse distributor, and two outputs. To the inputs of a code-time converter, the output of which through a band-pass filter is connected to the output of the break modulator, one input of which is a device input, serially connected register and decoder, the third output of the stochastic functional converter connected to one input register a, the other input of which is connected to the output of the pulse distributor, one output of the decoder is connected to the corresponding input of the code-time converter, another output of the decoder is connected to another input of the break modulator, and the register output is connected to the corresponding input of the stochastic functional converter, serially connected element OR is entered and a pulse counter, while the outputs of the bits of the decoder are connected to the inputs of the OR element, the output of the pulse counter is connected to the register setup input, n When in use, to the counting input of pulse counter connected to the corresponding output pulses rapredelitel, and the third decoder output - to an additional input of the register.

The drawing shows a structural electrical circuit of a device for simulating interference.

The device contains a band-pass filter 1, a modulator 2 breaks, a stochastic function converter 3, a converter 4 in a time, a register 5, a decoder 6, a distributor 7 pulses, a counter 8 pulses, the element OR 9, and the stochastic functional converter 3 consists of a generator of 10 equal numbers , block 11, iteration of numbers, block 12, comparison and storage unit 13,

The device works as follows.

The first impulse of each series excites the generator of 10 equal numbers, the number enumeration unit 11 and includes the part of the storage unit 13 in which the conditional distribution functions F y / (i, 0, ..., K) are stored. breaks Generator 10 of uniform numbers of BALON produces a random number Y, evenly distributed on the interval (0.1), Block 11, the search of numbers, block 12 of comparison and register 5 provide the drawing of the next state. Moreover, the register 5 sets the condition number 1 by selecting the appropriate group of cells from the included part of the storage unit 13, and the number search unit 11 searches these cells, this is fixed by the comparison unit 1. The next state received at the output of the block 11-over-counting of numbers is entered into the corresponding bits of the register 5 by a pulse from the distributor of 7 pulses. The decoder 6 determines whether this state belongs to the first (5j R) or second (5-R) group of states. In the latter case, at the output of the modulator 2, the interruptions are formed by overlapping, and the counter 8 through the element OR 9 is set to the zero state, which causes the installation of the origin of the error-free interval.

Second distributor pulse, 7 pulses excites generator 10

equal numbers, the block 11 enumerates the numbers and includes the part of the storage unit 13 in which the law of the distribution of the amplitude of the impulse noise is stored. In this case, the stochastic functional converter 3 implements the method of stochastic piecewise linear approximation and generates a random number, which is entered into the 4th converter in time. The third pulse of the pulse distributor 7 sets the algorithm of operation of the blocks of the stochastic function converter 3 and register 5 described above for the first pulse, however, it includes the part of the storage unit 13 in which the conditional distribution functions P jji, j 0, are stored. . ., K) states of a Markov process that specifies the moments of the appearance of impulse noise. If the next state of this process is bad ((2 +1) f, the decoder 6 generates a pulse, setting the counter of 8 pulses through the element OR 9 to the zero state and turning on the converter 4 in time. At the output of the bandpass filter 1, a pulse pulse is generated interference with an amplitude proportional to chisAu X. In addition, the third pulse of the distributor 7 pulses sets the contents of the counter of 8 pulses per unit, if at this interval of duration C there is no signal from the course of the element OR 9. If the total the duration of such nearby intervals will reach the value A – A / G, the pulse of the overflow of the counter of 8 pulses sets register 5 to the zero state and, thus, transfers Markov processes to non-return states and in the next interval of the first distributor pulse 7 pulses The next state of the first Markov process is played in accordance with the probability B.elcTppOM. If this state is bad (), the pulse from the additional output of the decoder 6 will increase by one the content of regis Tra 5 and will transfer the second Markov process to another non-returnable state. Additional inclusion in the device of the counter 8 pulses and the element OR 9 can significantly reduce the time of the model experiment, while ensuring the specified accuracy of the evaluation of the quality of the discrete information transmission system under study, the time gain obtained by limiting error free intervals is at least 8 .

Claims (1)

DEVICE FOR IMITATION INTERFERENCE on avt.sv. No. 919122, characterized in that, in order to reduce the time of interference simulation; the OR element and the pulse counter are connected in series, the outputs of the bits of the decoder are connected to the inputs of the OR element, the output of the pulse counter is connected to the installation input of the register, and the corresponding output of the pulse distributor is connected to the counting input of the pulse counter, and the third output of the decoder is to an additional register input. sya