RU2000666C1 - Device for correlation processing of broad-band signals - Google Patents

Abstract

Usage: in radio engineering, in communication systems with broadband signals. The inventive device comprises multipliers 1 and 3, a notch filter 2, an adder 4, a subtractor 5, a signal copy generator G, bandpass filters 7 and 20, a phase shifter 8, amplifiers 9 and 19, additional multipliers 10 and 18. delay elements 11-13 15-17. adjustable attenuator 14. The device compensates both the narrowband and the wideband interference component i. therefore, high noise immunity of the device is provided. 1 silt

Description

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N) O O O O O O O

ABOUT

The invention relates to the field of radio engineering and may find application in communication systems with broadband signals.

The purpose of the invention is to increase the tolerance to moisture.

The drawing shows a block diagram of the structure of the correlation processing of broadband signals.

The broadband signal correlation processing device comprises a first multiplier 1, a notch filter 2. a second multiplier 3, an adder 4, a reader 5, a signal copy generator b, a first bandpass filter 7, a phase shifter 8, a first amplifier 9. a first additional multiplier 10, a first Third delay elements 11-13. adjustable attenuator 14, fourth to sixth delay elements 15-17, second additional multiplier 18, second amplifier 19, second bandpass filter 20.

A device for correlation processing of broadband signals operates as follows.

The input mixture containing the useful signal of the broadband signal and the narrow-band noise is fed to the input of the circuit 5 in two loops, the first of which contains delay element 16, and the second contains elements 1-6, 20, 8-15, 17. 18 and 7.

Through the first branch passes a mixture of broadband signal and low-band interference. In the second branch, an estimate of the narrow-band interference is generated, which, entering the first input of the subtractor 5. compensates for the narrow-band interference coming to its second input in the mixture with the broadband signal by compensating for the narrow-band interference; a broadband signal is outputted from the device, and interference is suppressed,

An interference estimate is formed as follows.

The mixture of the broadband signal and the back-band interference is fed to the first multiplier 1, where, by multiplying the broadband signal with the synchronous reference signal, the narrow-band signal is minimized, and the narrow-band noise is phase-shifted by the reference signal and becomes wideband interference (BSS). The useful signal is rejected by a filter 2, which cuts out a narrow band from the broadband interference spectrum, after which the broadband interference due to the multiplier with the same reference signal supplied to the multiplier 3 through the delay element 11. becomes narrow-band, i.e. a narrowband interference estimate is formed. However, the presence of a notch filter 2 in the narrowband interference path leads to the fact that along with the narrowband output noise

of the multiplier 3, a broadband interference component is generated, the power of which is the DRC / DRC part of the power of the narrowband interference at the input of the device, where DRc is the band of the notch filter;

DRS - band of broadband signal. The broadband interference component is correlated with the broadband signal, i.e. has the same center frequency fo and the same phase shift law. WITH

In order to suppress the broadband component of the interference at the output of block 3, elements 20, 8, 9, and 10 are included. From the output of block 3, the narrow-band interference and the broadband component of the interference are fed to a bandpass filter tuned to fo and having an AA band. This filter extracts a narrow frequency band from the spectrum of the broadband interference component, which is output from the output of the bandpass filter 20 to

180 ° phase shifter 8 is amplified in amplifier 9 and multiplied in the first additional multiplier 10 with the same reference signal coming from the output of the signal copy generator through delay element 12. Thus, an estimate of the broadband interference component is generated, the phase by which phase shifter 8 is selected such that it is the opposite of the broadband component

interference entering the input of the adder 4 through the delay element 13. The amplitude of the broadband components of the interference arriving at both inputs of the adder 4 is achieved by adjusting the gain

amplifier 9. TK, as the amplitudes of the broadband interference components arriving at both inputs of the adder 4, are equal, and their phases are opposite, then in the adder 4 the broadband component of the interference is compensated. The low-bandwidth interference, which does not coincide in frequency with fo, does not pass through the bandpass filter 20. i.e. does not enter the evaluation path of the broadband component of the interference and, therefore, is not compensated in the adder 4, and passes through an adjustable attenuator 14 and a delay element 15 to the first input of the subtractor 5, where it compensates for the narrow-band interference coming to the second input

subtract 5 from the first branch.

Thus, in the inventive device, both the narrowband interference component and the wideband component are compensated. From the output of the subtractor 5 broadband

after amplification in the amplifier 19, the signal is supplied to the second additional multiplier 18, where it is multiplied with the reference signal coming from the output of the signal copy generator 6 through the delay elements 12 and 17. The result of the multiplication is filtered in the bandpass filter 7 and fed to the output of the device.

Claims (1)

SUMMARY OF THE INVENTION A broadband signal correlation processing device comprising a reader, a first bandpass filter, a signal copy generator, a first delay element and series-connected first multiplier, a notch filter and a second multiplier, to the second input of which through the first delay element and to the first the input of the first multiplier is directly connected to the output of the signal copy generator, and this is also the case. that, in order to increase the noise immunity, the second, third, fourth, fifth and sixth delay elements, the first and second additional multipliers, the second band-pass filter, the phase shifter, the adder, the first are introduced and a second amplifier and an adjustable attenuator, the output of which through the fourth delay element is connected to the first input of the subtractor, the second input of which through the fifth delay element is connected to the second input of the first multiplier, and the output of the subtractor through the second amplifier is connected to the first input of the second additional multiplier, the output of which connected to the input of the first bandpass filter, while the output of the signal copy generator through the second delay element is connected to the first input of the first additional multiplier and the sixth delay element, the output of which is connected to the second input of the second additional multiplier, and the output of the second multiplier is connected through the third delay element to the first input of the adder and through the second bandpass filter, phase shifter and first amplifier connected to the second input of the first additional multiplier, the output of which is connected to the second input of the adder, the output of which is connected to the input of an adjustable attenuator.