SU1338078A1 - Wide-band signal correlation processing device - Google Patents

Abstract

This invention relates to radio. The invention is an increase in noise immunity to narrowband interference. The device contains multipliers 1 and 8, gr.r 2 copies of the signal, integrator 3, key 4, comparison block 5, shaper 6 threshold, notch filter 7, subtractor 9, delay delay 10 and u-and with an adjustable coefficient gain With the help of a feedback circuit consisting of filter 7, multiplier 8 and 11 11, the useful signal arriving at subtractor 9 passes to its output without distortion, and the noise in it is compensated, which ensures attenuation of noise at the input of multiplier 1 The goal is achieved by the introduction of a filter 7, a multiplier 8, a subtractor 9, a delay of 10, and a l. 11. 1 slug. S cl so oe 00 about cx

Description

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The invention relates to a radio communication technique and may find application in communication systems with broadband signals.

The circuit of the invention is to increase noise immunity to narrowband interference.

The drawing shows a structural electrical circuit of the device for correcting and processing wideband signals.

The device for the correlation processing of broadband signals contains a multiplier 1, a generator 2 copies of the signal, an integrator 3, a key 4, a comparison block 5, a threshold former 6, a notch filter 7, an additional amplifier 8, a subtractor 9, a delay element 10, an I1 amplifier with an adjustable factor gain

The device for the correlation processing of broadband signals operates as follows.

The input signal, which is a mixture of the useful wideband signal and interference, is fed to the input of the subtractor 9, where the signal formed in the reverse link of the first link and received from the output of the amplifier 11 with adjustable gain is subtracted from it. From the output of the subtractor 9, the signal is fed to the input of the multiplier 1, where it is multiplied with the reference signal generated by the generator 2 of the signal copy. The result of the multiplication is accumulated in the integrator 3 and through the key 4, controlled by the generator 2, is fed to the comparison unit 5, where it is compared with the threshold signal generated in the driver 6.

At the same time, the signal from the output of multiplier 1 enters the feedback ring, containing a notch filter 7, an additional multiplier 8 and an amplifier) 1 with an adjustable gain factor. As a result of multiplying a copy of a sipgal, the useful signal of the output signal of the multiplier is minimized into a narrowband signal, and the narrowband interference turns into broadband interference with base B equal to the base of the useful PSS. In the reject filter 7, the minimized useful signal and a part of the interference spectrum falling in its band are rejected. The 1 / B part of the notch filter falls into the band. 380782

ti each clutter. Thus, the output of the notch filter 7 does not pass the useful signal, and the interference is attenuated no more than (1-1 / B) times. From the output of the notch filter 7, the interference goes to an additional multiplier 8, where by multiplying with the same copy of the useful signal Q la, delayed in the delay element 10, the delay τ equal to the interference delay in the notch filter 7 is reduced to narrowband signals, i.e. . driven to its original appearance. From the output of the additional multiplier 8, noise is fed through the amplifier 1I to the input of the subtractor 9. Thus, at the first input of the subtractor 9 there is a useful signal and interference, and at its second input only interference. In the reader 9, the antiphase of signals arriving at its inputs is provided. In the process of tuning the gain factor 2g, the amplification amplifier amplifier 11 with an adjustable gain factor is chosen such that the amplitudes of the signals at its output are ensured. Since the useful signal arrives only at the first input of the subtractor 9, and the interference — both at the first and at its second inputs — the signal at its output passes without distortion, and the interference in it is compensated. Uncompensated part of each

35 interference is 1 / Gd of it. This is the part of the spectrum that did not arrive at the second input of the subtractor 9 due to notching in the filter 7. Thus, by introducing a feedback ring, interference at the input of multiplier 1 is reduced B times.

Claims (1)

Invention Formula 45 A device for the correlation processing of broadband signals, containing a successively connected neutralizer, to the first input of which .. the first output of the signal copy generator, the integrator, the key, to the second input of which the second output of the signal copy generator and the comparison unit, the second input of which is connected to the output of the threshold generator, are connected, in order to increase the noise immunity to narrowband interference, in it is entered in series by the 30 40 313380784 A rewector filter, the input of which with an adjustable coefficient, is connected to the input of the integrator, the pre-amplification and the subtractor, the second input is an additional multiplier, the second of which is the input of the device whose input is connected through a correlation-delayed wideband delay signals, and the output is connected to the second of the signal copy generator, which is amplified by the multiplier input.