SU1173562A1 - Apparatus for monitoring signal-to-noise ratio - Google Patents

Abstract

A SIGNAL / INTERFERANCE MONITORING DEVICE containing a series-connected first non-linear converter, a filter and a first driver, a second rectifier, whose input is connected to the input of the first non-linear converter and is an input of the device; the receiver and the first input of the divider, the second input of which is connected to the output of the subtraction unit, and the output to the input of the threshold unit, the output of which is connected to the input of the execution unit, the output of which th is the output device, characterized tem, that, in order povsheni accuracy, it introduced a second nonlinear transformer, i input connected to the output of the second vshr DC converter, and output - with WTO (A ring input from subtractor unit D1.

Description

This invention relates to radio measurements and is used to monitor the state of communication channels in terms of signal-to-interference ratio when transmitting discrete information.

The aim of the invention is to improve the control accuracy achieved by eliminating measurement errors associated with changes in signal level at constant signal-to-noise ratio values.

The drawing shows a diagram of the device.

The device for controlling the signal-to-noise ratio contains a series-connected first nonlinear converter 1, a filter 2 and a first converter 3 and a series of second terminal 4 and a second nonlinear converter 5, subtraction unit 6, divider 7, threshold unit 8 and execution unit 9 the inputs of converter 1 and rectifier 4 are interconnected and are the input of the device, the output of converter 3 is connected to the first inputs of block 6 and divider 7, the second input (block 6 is connected to the output of converter 5, and the output of block 6 - with the second input of the divider 7, the output of which is connected to the input of block 8, the output of which is connected to the input of block 9, the output of which is the output of the device.

The device works as follows.

Converter 1 removes the relative phase modulation of the input signal. Its characteristic is

. () S

and, b, x - the output signal converts and

Outcomer 1;

and, and

- input voltages of signal aa la and interference; K, - coefficient of proportionality.

A useful component of the U signal can be represented in the world.

TSW () | u ,,

(1-cos2Wgt

where and. amplitude of the useful signal.

We are the carrier frequency of the signal. The narrowband filter 2 from the signal / interference mixture at the output of converter 1 separates the cleaned voltage with a frequency of 2Mg, which is proportional to u | g | j. Permanent signal component from the output of the rectifier 4

-By

has the form U, eykh -.le The output voltage of the converter 5 has the form

. cBbw of each r with in x n & x where K, proportionality factor.

The voltage at the output of the high voltage 3 with the coefficient K is proportional to TSW. Therefore, at the output of block 6, a voltage is obtained that is proportional to the square of the interference voltage at K, K2.

This voltage is applied to the first input of the divider 7, the second input of which is the voltage from the output of the coherent signal rectifier. As a result, the output of the divider 7 receives a signal proportional to the signal-to-noise ratio, which then goes to the threshold unit and causes or does not trigger the execution unit.

Claims (1)

DEVICE FOR MONITORING SIGNAL / NOISE RELATIONSHIP, 'comprising a first non-linear converter, a filter and a first rectifier, a second rectifier, the input of which is connected to the input of the first non-linear converter and is a device input, a subtraction unit, the first input of which is connected to the output of the first rectifier and the first input of the divider, the second input of which is connected to the output of the subtraction unit, and the output with the input of the threshold block, the output of which is connected to the input of the executive unit, the output of which is It is Busy output device, characterized in · that, in order to increase accuracy, it is entered into the second nonlinear transformer, whose input is connected to the output of the second rectifier, and an output - to a second input of the subtractor. 1 .1173562