The compensation device interference to receivers wideband signals

 

The invention relates to electrical engineering and can be used in receivers wideband signals. The device is provided by forming interference assessment by Ricchi from the input mixture useful broadband signal, and the band rejectee collapsed useful broadband signal does not increase in channels with megalocephaly. In the device at the inputs of the branches of the compensation included appropriate constraints, which ensures complete correlation of the signals at the inputs of the third multiplier. The technical result is the constant degree of noise suppression as in the absence of multipath channel and its availability. 2 Il.

The invention relates to the field of radio and can be used in communication systems with broadband signals.

The known device suppressing interference to receivers wideband signals described in the patents of the Russian Federation 200669, H 04 B 1/10, 2000659, H 04 B 1/10, 2143781, H 04 B 1/10, the lack of which is a small degree of noise suppression in conditions of multipath.

Closest to the present invention is the device according to the patent of the Russian Federation 2157049, a block diagram is shown in Fig.1, where indicated: 1, 3, 7, 9 - first, second, third and fourth is, 2, 13, 14 - first, second, third and fourth delay elements; 8 - rejection filter; 10 - attenuator; 11 - myCitadel.

The device prototype includes serially connected first multiplier 1, the bandpass filter 2, a second multiplier 3, the limiter 5, the output of which is connected with the control input of the third multiplier 7 and through the fourth delay element 14 with the control input of the fourth multiplier 9.

The inputs of the first multiplier 1, the first 6 and 12 second delay elements are combined and input devices. The output of the first delay element 6 connected in series through the third multiplier 7, the notch filter 8, a fourth multiplier 9 and the attenuator 10 is connected to a second input of vicites 11 whose output is the output device. The first input zicatela 11 is connected to the output of the second delay element.

The output of a pseudorandom sequence generator is connected with the control input of the first multiplier 1 and through the third delay element 13 with the reference input of the second multiplier 3.

The device prototype works as follows.

The input broadband signal and narrowband interference received at the signal input unit 1, the reference input is pode holonym signal. By multiplying the input and support of broadband signals, the broadband signal is minimized in block 1 in narrow-band signal, which is filtered by the block 2 and is fed from the output of block 2 on the signal input unit 3.

In block 1 narrowband interference is superimposed manipulation broadband reference signal block 4, which is then removed in block 3 by multiplication with the same reference signal. Part of the spectrum of the broadband interference is formed from a narrow-band interference in block 1, falls within the bandwidth of the block 2, and then is fed to the signal input unit 3, the reference input of which receives the reference pseudo-random sequence output unit 4 through the block 13. Thus, the signal input unit 3 is fed a mixture of rolled narrow-band signal and a narrow part of the spectrum of broadband noise, formed from narrowband. This mixture in the block 3 is multiplied by the reference pseudo-random sequence signal, causing the output of block 3 is allocated a mixture of the broadband signal and broadband interference, correlated with broadband useful signal has the same carrier and the same law manipulation and different from the useful Setanta its level when changing the levels of signal and noise at the input device, is supplied to the reference input of the block 7 and through the block 14 at the reference input of the block 9. On the signal input unit 7 through the block 6 is fed to the input mix that in block 7 is multiplied by the reference broadband mixture is correlated with the useful signal. In block 7 is convolution broadband input signal into a narrowband signal, which registereda in block 8 and therefore does not pass to the second input unit 11. At the same time, the narrowband interference in the block 7 by multiplication with broadband reference signal is broadband, the broadband part of the spectrum interference registereda in block 8. The rest of broadband noise is fed to the signal input unit 9, where it is multiplied by the same reference signal. Due to this broadband disturbance is minimized in narrow-band interference, which through the block 16 is supplied to the second input unit 11, which compensates for the disturbance in the input mixture coming from the input device to the first input unit 11 through the block 12.

Blocks 6, 13, 14 provide synchronicity peremezhaemyh voltage with delay signals (noise) in the apparatus. Unit 12 provides the alignment time interference and its assessment of the inputs of the block 11 with regard to spending time in the apparatus when FORMIROVANIYa a small degree of noise suppression in conditions of multipath.

To eliminate this drawback in the device containing the serially connected first delay element, the third persnoal, the notch filter and the fourth multiplier, connected in series to the first multiplier, the bandpass filter, the second multiplier and the first limiter, the output of which is connected with the control input of the fourth multiplier and a fourth delay element with the control input of the fourth multiplier, in addition, the generator output SRP is connected with the control input of the first multiplier and through the third delay element with a reference input of the second multiplier, the input of the first multiplier and the first delay element is connected, the input of the second delay element is an input device, and the output of the second delay element connected to the first input of vicites whose output is the output device, input a second limiter and connected in series synchronously phase filter, an adjustable amplifier, the fifth multiplier and integrator. Thus the output of the integrator is connected with the control input of the adjustable amplifier, the output of which is connected with the second input myCitadel, the output of which is connected to a second input of the fifth multiplier, p is coupled to the output of the fourth multiplier. The input of the second limiter connected to the input of the second delay element, the output of the second limiter connected to the input of the first delay element.

Structural diagram of the inventive device shown in Fig.2, where indicated: 1, 3, 7, 9, 17 - first, second, third, fourth and fifth multiplier products;
2 - band-pass filter;
4 is a pseudo - random sequence generator (SRP);
5, 15, the first and second limiter;
6, 12, 13, 14 - first, second, third and fourth delay elements;
8 - notch;
10 - adjustable amplifier;
11 - myCitadel;
16 - synchronous phase filter;
18 - integrator.

The proposed device comprises serially connected first multiplier 1, the bandpass filter 2, a second multiplier 3 and the first stopper 5, connected in series, the second stopper 15, the first delay element 6, the third multiplier 7, the notch filter 8, a fourth multiplier 9, the synchronous phase filter 16, an adjustable amplifier 10 and the fifth multiplier 17. When the input of the second limiter 15 and the second delay element 12 and are connected by the input device. The input of the first delay element 6 is connected to the input of the first multiplier 1, the reference input is C3. The output of the first limiter 5 is connected with the control input of the third multiplier 7 and through the fourth delay element 14 with the reference input of the fourth multiplier 9. The output of the second delay element 12 is connected to the input of the synchronous phase filter 16 and the first input vicites 11, a second input connected to the output of the controlled amplifier 10. The output of vicites 11 is connected to a second input of the fifth multiplier 17 and an output device. The output of the fifth multiplier 17 through the integrator 18 is connected with the control input of the controlled amplifier 10.

The proposed device operates as follows.

The input mixture consisting of useful broadband signal and interference (e.g., narrowband), from the input device through the block 15, exercising its hard limit, and unit 6 is fed to the input of the first multiplier 1, the reference input is from the output of block 4 is supplied a reference pseudo-random sequence (SRP) useful broadband signal, synchronous with the useful broadband signal in the input mixture. By multiplying useful input broadband signal and the reference SRP broadband signal in the block 1 is folded in narrow-band signal, kotorogo crosstalk due to its multiplication (manipulation phase (0;) SRP unit 4. Part of the spectrum of broadband noise falls within the bandwidth of block 2, in which the filtration she turns into a narrowband interference and is supplied to the input unit 3, the reference input of which is supplied with SRP unit 4 through the delay element 13.

Thus, the input unit 3 receives a mixture of narrow-band (collapsed) of the wanted signal and narrowband interference generated from broadband noise (due to expansion of the range of narrowband interference in block 1).

This mixture in the block 3 is multiplied by the (manipulated phase 0,with the support of the SRP signal, causing the output of block 3 is allocated a mixture broadband signal correlated with it broadband noise (formed in this example of a narrow-band interference), which differs from the useful broadband signal initial phase amplitude.

This mixture after amplitude limitation unit 5, which provides a constant voltage level at the output of block 5, is fed to the reference input of the block 7 and through the fourth delay element 14 at the reference input of the block 9. To the input unit 7 is fed limited input mix output unit 15 through the block 6. In the excitation of the evaluation of the input broadband signal. The result of the convolution output unit 7 is a narrowband signal, which registereda unit 8 and is not supplied to the second input unit 11.

At the same time, in block 7 on the narrowband interference is superimposed manipulation broadband reference signal, which is then removed in block 9 by multiplication with the same reference signal on the reference input unit 9 through the block 14. This rejection of the advanced spectrum interference unit 8 can be neglected due to the narrowness of his band of rejectee. Thus, from the output unit 9 for supporting the input unit 16 receives the narrowband interference constant amplitude, and the output unit 12 to the input unit 16 - input mixture. The output of block 16 pass only those signals (noise) that is present on the reference input unit 16. So as to support the input unit 16 is only present assessment of narrowband interference, the output of block 16 is allocated only narrowband interference, in accordance with the monograph by C. M. Svistov. Radar systems and their processing. M: Owls. radio, 1977, S. 123 phase coincides with the phase of the narrowband noise at its input, and the amplitude of its accurate to a constant factor coincides with the amplitude of the narrowband interference on its signal input.

the AMI transfer units 16 and 10, is achieved by automatic adjustment of the coefficient of transmission block 10 made using the blocks 17 and 18. Indeed, in the block 17 is the multiplication of voltage estimation noise on the output unit 10 and the residual voltage noise at the output of block 11. The result of the multiplication is integrated block 18 and is used to adjust the gain of the block 10. The more residual voltage noise at the output of block 11, the greater the voltage at the control input unit 10. While the ratio of transmission block 10 is increased, and the residual voltage at the output of block 11 is reduced.

Thus, the block 16 provides automatic adjustment of the amplitude and phase of the generated assessment of narrowband interference under amplitude and phase corresponding to noise in the input mixture. Constant factor determines the ratio of the transmission unit 16. With the help of block 10 transfer coefficient tract, consisting of blocks 16 and 10, is selected as close as possible to unity. At the first input unit 11 receives an input mixture through the block 12, the second sign - estimating interference from the output of the block 10. Thus, in block 11 is compensation narrowband interference and the useful signal at its output comes practically the alignment has time interference and its assessment of the input unit 11, their values are chosen when configuring the unit delay signals (noise) in the equipment.

Your prototype when working in channels with megalocephaly decreases the degree of noise suppression. So, in the presence of multipath appears spurious amplitude modulation of the useful signal. The presence of spurious amplitude modulation of the useful signal leads to the expansion of its spectrum. Therefore, in conditions of multipath part of the spectrum collapsed useful signal lies outside the band of rejectio block 8 and comes to the input unit 11, which compensates for the signal in the input mixture, which leads to the loss of power of the useful signal at the output of block 11. To exclude the effect of suppression of the useful signal in block 11 in the prototype it is necessary to expand the band rejectee block 8, which leads to an increase in the degree of distortion estimating interference due to the increase of the advanced spectrum interference, registeremail in block 8. The degree of suppression of the interference is reduced.

In the proposed device is the limitation of the input mixture in the block 15. At the output of limiter parasitic amplitude modulation is transformed into a parasitic phase modulation (see j. Spilker. Digital satellite tie the inputs of the blocks 7 and 1 is a broadband signal with a parasitic phase modulation, due megalocephaly. Therefore, the evaluation of the wideband signal generated in blocks 1, 2, 3 using blocks 4 and 13, has the same parasitic phase modulation as useful broadband signal at the input unit 7.

Due to the fact that peremejaemye in block 7 signals retain their correlation, as in the presence of multipath, and in its absence, the result of the convolution of the useful signal and its estimation in block 7 in both cases is a narrowband signal, the range in which the proposed device does not change when changing the characteristics of the channel.

Thus, the proposed device provides rejection of the useful signal notch filter, band rejectee which does not expand when working in channels with mnogoluchevogo. This means that in the proposed device, the degree of suppression is not reduced in channels with megalocephaly.

This holds good when the impact is not only narrow, but also for broadband noise whose structure differs from the structure of the useful signal.


Claims

1. The compensation device interference to receivers wideband signals containing eremetical, connected in series to the first multiplier, the bandpass filter, the second multiplier and the first limiter, the output of which is connected with the control input of the third multiplier and a fourth delay element with the control input of the fourth multiplier, in addition, the output of a pseudorandom sequence generator (SRP) is connected with the control input of the first multiplier and through the third delay element with a reference input of the second multiplier, the input of the first multiplier and the first delay element is connected, the input of the second delay element is an input device, and the output of the second delay element connected to the first input of vicites whose output is the output of the device, characterized in that that introduced a second limiter and connected in series synchronously phase filter, an adjustable amplifier, the fifth multiplier and integrator, the output of which is connected with the control input of the adjustable amplifier, the output of which is connected with the second input myCitadel, the output of which is connected to a second input of the fifth multiplier, and the output of the second delay element is connected to the input of synchronous-phase filter, a reference input connected to the output of the fourth transaction is coupled to the input of the first delay element.

 

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