SU605220A1 - Discrete channel simulator - Google Patents

Description

one

The invention relates to the field of modeling communication channels in data transmission systems and can be used in the development of error protection devices and specialized devices designed for solving problems related to noise immunity studies and increasing reliability in the data transmission system. This device allows you to simulate the channels in which non-transmission is carried out using n orthogonal signals.

A device for simulating a path for transmitting digital signals is known, which contains a register, a dial pad, triggers, filters 1.

The closest technical solution to the invention is a device for simulating discrete channels, containing a clock source, connected to the inputs of the master oscillator and a random flow sensor, the outputs of which are connected to the control inputs of the equivalence elements 2.

The disadvantage of the known devices is that they do not allow to simulate the nature of the change, for example, the amplitude values of each of the elements of the discrete sequence at the input of the first decision circuit when the interference in the communication channel and the different structure of receiving devices changes, when each of the elements can be transmitted orthogonal signals, where.

The purpose of the invention is to improve accuracy.

This is achieved in that the device contains AND elements, blocks of threshold elements, RSHR elements, prohibition elements, delay elements and functional converters, the output of one of which is connected to information inputs of equivalence elements. The outputs of the other functional transducers are connected to the information inputs of the corresponding prohibition elements, the output of each of which is connected to the first input of the corresponding OR element, the second inputs of each of the P1LI elements - to the outputs of the corresponding equivalence elements. The control inputs of the inhibit elements are connected to the corresponding outputs of the random flow sensor, the output of each element P1LI is connected to the corresponding inputs of the blocks of the threshold elements, the outputs of each of the blocks of the threshold elements are connected to the inputs of the corresponding element And, the outputs of which are the same outputs of the device. The outputs of the occasional flow sensor are connected via delay elements with other outputs of the device.

A block diagram of a device for modeling discrete channels is shown in the drawing.

The device contains a source of 1 clock pulses, a sensor of 2 random streams with outputs 3t-3p, a master oscillator 4, functional converters 5 and 6i-6p, equivalence elements, prohibition elements 8p, OR elements 9i-9p, delay elements lOi-lOn -lln, threshold elements, elements And 12i-12i, outputs 13i-13n and 14i-14 ".

The device works as follows. When the device is turned on (the switching circuit is not shown), at the moments of the arrival of clock pulses, the sensor 2 of random streams randomly generates pulse sequences at its outputs (3i, 32, ..., Sn), and at these fixed moments of time the emulsion appears randomly only on one of the n sensor outputs.

At the same times, the outputs of the master oscillator 4 are random signals arriving at the inputs of the corresponding functional transducers, which convert them into signals corresponding to the signals at the outputs, for example, integrators of the receiver's n-signals. At the same time, the output of the functional converter 5 generates a signal corresponding to the output signal of, for example, a filter or receiver integrator, where the signal "disturbance" is extracted, and the outputs of the functional converters 6i-6i are the signals corresponding to interference, outputted at the outputs, for example filters or receiver integrators with no input signal. Depending on the type of conversion performed by the functional converters on random signals from the outputs of the master oscillator 4, and on the laws of the distribution of these signals, the reception of susceptible signals in the channel of discrete signals by different types of receivers is simulated.

From the output of the functional converter 5, the signal arrives at the information inputs of all elements of equivalence, and from the outputs of the functional converters signals are fed to the information inputs of the corresponding prohibition elements.

The signal from one of the outputs, for example, 3 ;, where, 2, ..., n, of the sensor 2 of random streams passes to the control inputs of the corresponding elements 7, equivalence and prohibition elements 8d, and through the corresponding elements the South delay enters output 14, devices. If a pulse is output at the output, for example, at the exit of the random flow sensor, then this impulse goes to the control inputs of the equivalence element 7 and the prohibition element 83.

In this case, the signal from the output of the functional converter 62 through the element 82

a ban on the input of the element OR 92 does not pass, and from the output of the functional converter 5, the signal through the element 72 of equivalence goes to the input of the element OR 92.

From the outputs of other functional converters 6 (except converter 62), through the corresponding prohibition elements (except element 82), the signals are fed to the inputs of the corresponding OR elements.

Both outputs of the elements OR appear signals: at the output of the element at the output of the element 92-t) 2, at the output of the element

T1 „.

These signals are fed to the inputs of blocks of threshold elements. In the lli block, the following conditions are verified: t), ..., rii t1n, in block 112, the fulfillment of the conditions: ...,.

A similar check is carried out in the remaining blocks.

The fulfillment of each of these conditions is indicated by a signal at the corresponding output of the block of threshold elements. These signals from the outputs of the respective blocks of the threshold elements arrive at the inputs of the corresponding elements And 12i-12p.

At the output of the element 12, a signal occurs if all the inputs of this element have signals, i.e., if the conditions are fulfilled:

In this way, when a pulse appears on

the output 3g of the sensor 2 random streams im35 pulse at the output 13g of the device appears

only when the conditions are met:

 f i -rit; ---, f (i in This corresponds to the non-clockwise transmission of this signal. If this condition is not fulfilled, then this corresponds to an error when transmitting this bit of discrete information.

The unrivaled unrivaled information (information that was transmitted to a discrete channel) is removed from the HI-14 outputs of the device.

The signals at the I3i-13p outputs carry a posteriori information.

Claims (2)

1. Authorship certificate of the USSR №292166, cl. G 06G 7/48, 1969. 2. Authorship certificate USSR № 369582, cl. G 06G 7/48, 1971.