SU470846A1 - Device for controlling the reliability of digital information - Google Patents

Description

one

The invention relates to the field of telemechanics and is intended for monitoring the accuracy of digital information received by the method as a whole.

A device for monitoring the reliability of discrete information is known, comprising a correlation receiver, a transmission error analyzer, an information processing unit, and a control unit.

However, this device does not realize the potential possibilities available for a quick quantification of the reliability of information transmitted using signals that are orthogonal in an amplified sense, for example, G. Velti Quaternary E-sequences or octal codes based on them.

These codes are very promising due to the ideal correlation properties and the relative simplicity of the hardware implementation.

The known device is simple, but it cannot provide high control efficiency, since it does not take into account the correlation properties of signals that are orthogonal in the strengthened sense and for the duration of the signal T calculates only one confidence estimate (in the form of AC).

The increase in speed in the proposed device is achieved by the fact that it contains between the correlation outputs of the receiver

and analyzer inputs of the transmission error of serially connected electronic keys, pulse shapers and pulse counters. The correlation outputs of the receiver are also connected to the circuit circuit OR, the output of which is connected to the input of the control unit. The output of the control unit is connected to the synchronization inputs of electronic keys and pulse counters.

This allows for each correlation step to check the fulfillment of the condition

p () 0, (, 1,2 ... / g-1),

where Q (T) is the value of the autocorrelation function, and automatically calculate the number of cases of non-fulfillment of the specified equality on the selected measuring interval. (For quasi-orthogonal right signals, a part of the equation is assumed to be equal to the value of the largest lateral emission of the correlation function).

Due to the specified features, the proposed device provides:

1) a significant increase in the efficiency of the control of reliability due to an approximately fold increase in the frequency of control samples, which characterize the distortion of the signal in the communication channel;

2) the possibility of simultaneous evaluation of the intensity of interference in each of the channels of the correlation receiver (which, in frequency division, makes it possible to judge the effect of interference at each frequency of the composite signal, as in a panoramic reception).

A diagram of a device for controlling the reliability of digital information is shown in FIG. one; in fig. 2 given a temporary diagram of his work.

It contains receiver 1, electronic keys 2, pulse shapers 3, pulse counters 4, transmission error analyzer 5, information processing unit 6, OR7 circuit, control unit 8.

The operation of the device is explained in timing diagrams (Fig. 2) and is as follows.

The received signals from the information output of the receiver 1 are fed to the input of the information processing unit 6. At the same time, signals from each of the correlation outputs of the receiver (Fig. 2, a, b, c) are fed to the electronic switches 2. The latter, by gating, separate the lateral emissions of the correlation functions in each of the channels (Fig. 2, e, g, ..., h) It is essential to note that when using signals that are orthogonal in an enhanced sense, the appearance of lateral emissions will be caused only by the effect of interference on the communication line (this is reflected in Fig. 2 by the fact that lateral emissions are shown by a dotted line).

The gate voltage that opens the keys is generated by the control unit 8 and is shown in FIG. 2, e. It is formed under the action of a signal (Fig. 2, d) formed at the output of the circuit "OR 7, whose inputs are connected to the correlation outputs of receiver 1.

From the outputs of electronic switches, signals are sent to pulse formers 3 (acting as rectifiers and pulse normalizers). As a result, a short pulse will correspond to each of the lateral emissions of the correlation function, so that the output signals at the outputs of the pulse shapers take the form shown in FIG. 2 and, to, ..., l. These pulses are counted by the counters 4 at the measuring intervals specified by the control unit.

The output signals of the counters arrive at the analyzer 5 transmission error 5, where the frequency of lateral emissions corrected

of the field functions are calculated by the coma ™ and the interference distribution of the channels of the correlation receiver.

2

The basis of the calculation of a is the ratio

2 Rosh

° Rel - ;; I o

where ROSH is the error probability in receiving a signal, 6 is the number of channels.

In conclusion, we note that the most important indicators of the proposed control device, such as the probability of undetectable Rio distortions and the likelihood of detectable distortions of robotic signals in relation to orthogonal quaternary sequences and work with an active pause, are defined by

P., P (l-pr-

: -P2

/ OBN-1-21С Ч1-Р) -Т

where C /, is the number of combinations of n according to /; p is the probability of distortion of the elementary signal (subpulse); n is the number of elementary signals in the upper (lower) sequence.

For the most common case where 2 / g / 7 C1, these algorithms are further simplified.

Рно (npY Лбн - 1 - (1 - 2 / г / 7) - (tipY - пр (2 пр) пр.

From this it follows that / by Srob. This indicates the high quality of the proposed, control device.

Subject invention

Confidence Control Device

digital information containing a receiver connected to one of the inputs of the information processing unit, serially connected control unit and transmission error analyzer that is connected to another input of the information processing unit, characterized in that, in order to increase the speed of the device, an "OR and chains of series-connected electronic key, driver and pulse counter, the receiver outputs being connected to one of the electronic key inputs and the inputs of the OR, cat output The operator is connected to the input of the control unit, one of the outputs of which is connected to the other inputs of electronic keys, and the other output of the control unit is connected to the input of each pulse counter whose outputs are connected to the transmission error analyzer.