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Generator of artificial traffic. RU patent 2339155.

IPC classes for russian patent Generator of artificial traffic. RU patent 2339155. (RU 2339155):

H03B29 - Generation of noise currents and voltages

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FIELD: physics, radio.

SUBSTANCE: invention is related to radio engineering and communication, may be used in modeling and testing of telecommunication systems, in particular, local computer networks at the stage of design. Random sequences generated in this invention make it possible to imitate the load with property of self-similarity. In generator of random signals, which contains noise generator, the first device of selection and storage, generator of ramp voltage, the first comparison circuit, delay element and RS-trigger, the following components are introduced: additional generator of noise, the second device of selection and storage, the second comparison circuit, reconfigurable clock pulse generator and switch. Invention may be used for long-term prediction of self-similar load during synthesis of communication network control system in aspects of intranet organisation.

EFFECT: provision of possibility to imitate the load with property of self-similarity.

2 dwg

The technical field to which the invention relates

The invention relates to radio engineering and communication, can be used for modeling and testing of telecommunication systems, in particular local area networks at the design stage.

The prior art

Known multi-channel generator with a temporary method of decorrelation of signals containing noise generator, clock generator pulses, the quantizer, the interpolator, the time switch and the switch (see Bonev BTW Generating random signals M., "Energy", 1971, p.84) and a noise generator (see USSR Author's certificate No. 369673, CL. NV 29/00, 1971).

The disadvantage of these generators is that the resulting conversion pulses have the probability density of the source signal in the form of random amplitude periodic pulses, and the generator is not possible to separately adjust the time correlation, and hence the spectral density.

The closest to the technical nature of the claimed invention is "random signals". The invention includes a noise generator, connected in series generator of clock pulses, an adjustable delay element and the element, And the output D-flip-flop, connected in series with a memory unit, whose input is connected to the output of the noise generator, a comparator, and a first RS-flip-flop, the output of which is connected to another input element And connected in series element constant delay and the second RS-trigger the counting input of which is connected to the output element, And the return to the D-input output D flip-flop oscillator ramp voltage, the output of which is connected to another input of the comparator, the inputs of the oscillator ramp voltage element constant delay, the counting input of the first RS-flip-flop and the input synchronization output D-flip-flop combined and connected to the generator output clock pulses (see USSR Author's certificate No. 1116524, CL. NV 29/00).

However, generated in this device, a random sequence does not allow to simulate the load that has the property of self-similarity.

Disclosure of the invention

The task of the invention to provide a random pulse sequences that allow you to simulate self-similar load (traffic).

The technical result

The technical result is achieved by the fact that the random signals containing noise generator, the first device selection and storage information input connected to the output of the noise generator, the generator linearly varying voltage, the first comparison circuit, the outputs of which are connected with the output of the first sampling device and storage and generator output linearly varying voltage, respectively, a delay element and RS-flop's input which is connected to the first output of the comparison circuit, introduced additional noise generator, a second device selection and storage, United their information input to an output of the additional noise generator, the second comparison circuit, the inputs of which are connected to the output of the oscillator ramp voltage and the output of the second device, sample and hold, respectively, tunable clock generator pulses, the output of which is connected to the input of the ramp generator voltage, control inputs of the first and second devices sample and hold and a second input switch, an input of delay circuit connected to the output of sample and hold, and the output connected to the first input switch, the second output of the comparison circuit connected to the third input of the switch and the movable contact of the switch is connected to the input R-RS trigger outputs trigger are the generator output artificial traffic.

A brief description of the drawings

Figure 1 shows the functional diagram of the generator of artificial traffic.

Figure 2 presents the timing diagram explaining the principle of operation of the generator of artificial traffic.

The implementation of the invention

The artificial traffic generator comprises a generator 1 of the noise connected with its output to the first input of the unit 2 sample and hold, and the second input to the generator 3 linearly varying voltage and tunable generator 10 clock pulses, the first scheme 4 comparison that is connected to its first input with the output of the first unit 2 sample and hold and delay element 5, the output of which is connected to the first input of the switch 12, the second input of the first circuit 4 comparison connected with generator 3 linearly varying voltage, and the output to the first input of the RS flip-flop 6, the additional output of the noise generator 7 connected to the first input the second device 8 sample and hold, a second input connected to the generator 3 linearly varying voltage and tunable generator 10 clock pulses and a second input 11 of the switch, a second circuit 9 comparison, the first input of which is connected to the output of the second device 8 sample and hold, and the second input to the generator 3 linearly varying voltage, the output is connected to the third input 13 of the switch, the movable contact 14 of the switch is connected to the second input of the RS flip-flop 6, the output of which is the output of the generator 15 artificial traffic.

The artificial traffic generator works as follows.

A random signal with a given distribution law from the output of the noise generator 1 (see U 1 in figure 2) is supplied to the input of the sample and hold 2, which contains a mixer and extrapolator zero order. The clock pulses generated in the tunable clock 10 arrives at the control input of the sample and hold 2, where the cut instantaneous value U i of a random signal (see U 1 in figure 2), which are then extrapolated (see U 2 in figure 2) and fed to the first input of the comparison circuit (comparator) 4, to the second input of which serves sawtooth pulses from the output of the ramp generator voltage 3 (see U 3 in figure 2). As soon as the ramp voltage exceeds the level of comparatie (extrapolated voltage), the output of the comparison circuit is allocated pulse (see U 4 in figure 2), which is the cutting edge will translate RS-trigger 6 to the second stable state, the output will appear high potential (see U 11 , U 12 , U 13 figure 2). Thereby will be fixed leading edge of the pulse, the time of occurrence of which is random and is determined by the distribution of the original process Ui, which easily translated into time intervals, measured from the origin

where τ T is the repetition period of the clock pulses, U 0 is the amplitude of the ramp voltage, U cp is the average value of a random process.

The duration of the pulses obtained at the output of the RS flip-flop 6, depends on the position of the switch, the movable contact 14 which is connected with the installation input R to zero RS-flip-flop 6. If the contact 14 is in position 11 at the output of the RS flip-flop 6 pulses with a fixed position of the clock pulse back-to-back (see U 11 figure 2). This case corresponds networks SPH (synchronous digital hierarchy).

If the sliding contact 14 is in position 12, the falling edge of the output pulse is detained by the value of τ C , and shaped pulses will have a constant duration, when τ h =53 bytes/V(bps), where 53 byte - length ATM cells, a V - speed transmission cell, then this case can simulate the ATM network (see figure U 12 figure 2).

And finally, when the switch is in position 13 at the output of RS flip-flop 6 is formed of random duration and position of the leading edge sequence (see figure U 13 figure 2), which characterizes the most General case. The second additional noise generator 7 generates a random process, which is supplied to the information input of the second device, the sample and hold 8, the control input of which is supplied a clock sequence with a clock generator 10, while the output is extrapolated voltage. In the second comparison circuit 9 is the act of comparing the voltage of the ramp generator voltage 3, and received in the moment of crossing these strains pulse returns the RS-flip-flop 6 in original condition through the contacts 13-14 switch.

The positive effect from the use of artificial traffic generator is that it can be used for testing of communication networks at the design stage, creating the load (traffic) in the form of a self-similar process without the involvement of users in the network. Additionally, the invention can be used for long-term prediction of self-similar load in the synthesis of a control system of a communication network aspects of the intranet of the organization.

The generator of artificial traffic containing the noise generator, the first device selection and storage information input connected to the output of the noise generator, the generator linearly varying voltage, the first comparison circuit, the inputs of which is connected to the output of the first sampling device and storage and generator output linearly varying voltage, respectively delay element and RS-flop's input which is connected to the first output of the comparison circuit, characterized in that it introduced additional noise generator, a second device selection and storage, United their information input to an output of the additional noise generator, the second comparison circuit, the inputs of which connected to the output of the oscillator ramp voltage and the output of the second device, sample and hold, respectively tunable clock generator pulses, the output of which is connected to the input of the ramp generator voltage, control inputs of the first and second devices sample and hold, and a second input switch, an input of delay circuit connected to the output of the first sampling device and storage, and the output connected to the first input switch, the second output of the comparison circuit connected to the third input of the switch and the movable contact of the switch is connected to the input R-RS trigger outputs trigger are the generator output artificial traffic.