RU2000665C1 - Device for correlation processing of broad-band signals - Google Patents

Abstract

Usage: in radio communications, in systems with broadband signals. The inventive device, the input mixture containing a broadband signal and narrowband interference, is fed to the subtractor 5 in two branches: one branch contains only a delay element 14, and the second is a series-connected multiplier 1, filter 2, sum 14 g 12 17 I mater 11, the second multiplier 3, the attenuator 15. The reference SRP from the signal copy generator 6 is supplied to the second inputs of the multipliers 1 and 3, directly to the multiplier 1, and to the multiplier 3 via delay element 13. From the output of the subtract 5, the signal through path 7 conversion and filtering amplification is fed to the input of the third additional multiplier 8, where it is multiplied with a reference signal supplied through an additional delay element 16. The result of the multiplication is filtered by a band-pass filter 4. To attenuate the BSS from the output of the multiplier 3, the signal is transmitted through the second band-pass filter 9 connected in series, amplifier 10 , a phase shifter 12 by 180 °, the delay element 17 is fed to the second input of the adder 11. The purpose of the invention is to increase the noise immunity to narrowband interference. 1 ill. s: K) o o o o o o o o

Description

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

The aim of the invention is to increase the noise immunity to narrowband interference. The drawing shows a structural electrical diagram of a device for correlation processing of Broadband signals.

The device for correlation processing of broadband signals contains a multiplier 1, 3, and 8, a notch filter, the 2nd central frequency of the NPS spectrum, slot filters 4 and 9 to the central frequency of the NPS spectrum, learning B, generator 6 of the signal {GKS}, path 7 amplification, conversion and filtering, adjustable amplifier 10, adder 11, 180 ° phase shifter 12 (adjustable), adjustable delay elements 13-1, adjustable attenuator 113.

The device operates as follows.

The input mixture, which contains a broadband signal (SHGS) and a narrow-wave / ohm xy (UE), receives 1 the first input of the subtractor 6 through the delay element 14 and to its second pass through the -sequential blocks 1, 2, It, S, and $ 1. In the multiplier 1, the NPS due to the pair of knives with the synchronous reference signal generated in the GCS b, is turned into a harmonic signal not at the carrier frequency, which is cut by the filter 2. UP For multiplication from the reference signals, the broadband signal from the broadband spectrum becomes a part of the spectrum is filtered out to the filters 2, the rest of the interference spectrum is fed to the chip multiplier 3, where due to multiplications with the same reference Signals, the narrow-band interference is turned back. This forms a narrow-band component of the interference estimate, and is fed to the input of the subtractor 5 through the attenuator 15, where it compensates for the interference from the input mixture. However, along with the narrowband interference component, a broadband interference component (BSS) is formed at the output of the multiplier 3, which is correlated with the useful BSS. Its appearance is due to the presence of a notch filter 2. Its average frequency is equal to the average frequency of the NPS spectrum f0. and the law of phase manipulation coincides with the structure of the useful BSS, its initial phase is determined by the initial phase of the interference. This component of the interference noise is not compensated in the subtractor 5 and passes to the output of the device, as well as the useful signal,

amplified in block 7, multiplied with a reference copy in block 8, filtered in block 4, In order to attenuate the BSS from the output of the multiplier 3, it goes to a bandpass filter 9 tuned to f ° and having a DR band equal to the notch band of filter 2 and the passband of the filter 4. The allocated part of the spectrum tlUnC) is amplified in block 10 and supplied to the input of the multiplier 3 through the 180 ° phase shifter 12, the delay element 17 and the adder 11. The gain of the block 10, the delay in the block 17, the phase of the phase shifter 12 during the tuning process is selected so that provision compensation NLS output multiplier. The delay value of element 17 in some cases (for example, at a low clock frequency of the SRP, when the delay in the filter 9 can be neglected) can be zero, at a high clock frequency of the SRP and a large delay in the filter 9.

The value is determined from the relation T т t + Gf, where T is the period of the bandwidth. TF is the delay of the signal in the filter.

Claims (1)

The claims Broadband signal correlation processing device, comprising a first delay element w subtractor connected in series, a first multiplier, a rejector filter and a second multiplier connected in series, and a third “multiplier and a bandpass filter, the output of which is the output of the device, as well as a signal copy generator, the output is connected in series which is connected directly to the other input of the first multiplier, and through the first input of the second and third multipliers, respectively h the second and third delay elements, a band-pass filter, the fourth delay element and an attenuator, characterized in that, in order to increase the noise immunity to narrow-band interference, a 180 ° phase shifter, an adder and two amplifiers are introduced, while the first input of the first multiplier is connected to the input of the first delay element, the output of the notch filter through the adder is connected to another input of the second multiplier, the output of which is through a series-connected bandpass filter, the first amplifier, a 180 ° phase shifter and the fourth element a delay coupled to another input of the adder, the output of the second multiplier through 520006656 the attenuator is connected to another input; the amplifier is connected to the second input of the third reader, the output of which is through the second amplifier.