Device for noise compensation

 

The device relates to the field of radio engineering and can be used in the receiving device. The technical result is to increase the degree of noise suppression and the number of suppressed interference. For this purpose the device is introduced first, second, third and fourth channels, each of which contains myCitadel, the unit phase-locked loop and formation evaluation interference and interference detection unit and switching assessment of interference; in the first channel introduced three additional myCitadel, the second channel introduced two additional vicites and the third channel introduced one additional myCitadel. 4 Il.

The invention relates to electrical engineering and can be used in the receiving device.

The known device the noise compensation described in the patents of the Russian Federation No. 2157049 N 04 1/10 and No. 2166231 N 04 1/10, which disadvantage is the low degree of noise compensation.

The closest to the technical nature of the claimed device is a device for noise compensation described in article Venediktova M. C., Stupina A. N. "Adaptive compensation of interferences", published in the journal "telecommunications" No. 10, 1992, adopted as a prototype.

The structural scheme of the device prototype presstore and formation evaluation interference.

The device prototype has the following functional relationships. The first input vicites 1, is connected to the input of the phase-locked loop and formation evaluation interference 2 is an input device; an output unit phase-locked loop and formation evaluation interference 2 is connected with the second input vicites 1 whose output is the output device.

The device prototype works as follows.

The input mixture containing the signal and N interference (e.g., narrowband), with the input device to the input of block 2 and the first input unit 1. In unit 2 is phase locked loop to the frequency of one of the interference and the formation of the assessment of noise captured by the system PLL block 2, which is supplied to the second input unit 1, where it compensates for the corresponding disturbance in the input mixture fed to the first input unit 1, the result on the output device (output of block 1) is the input mix, which offset one of the noise captured by the system phase-locked loop block 2.

The drawback of the prototype is the low degree of interference suppression and a small number of suppressed interference.

This disadvantage is eliminated for Scania assess the interference and the first myCitadel, the first input which is the input device, introduced the first, second, third and fourth channels; these first unit phase-locked loop and formation evaluation interference and the first myCitadel included in the first channel, which also introduced the first block of the detection of interference and switching assessment noise and serially connected first, second and third additional myCitadel, the first input of the first additional vicites connected to the input of the first channel, and the output of the third additional vicites connected to the input of the first unit phase-locked loop and formation evaluation interference, the first and second signal outputs which are connected respectively with the first and second signal inputs of the first block of the detection of interference and switching assessment of interference, the output of which is connected with the second input of the first vicites whose output, which is the output of the first channel, connected to the input of the second channel, which introduced the second detection unit interference and switching assessment of interference, the second myCitadel, serially connected first and second additional myCitadel and the second block of phase-locked loop and formation evaluation noise, etc is carried out by input of the second channel, the first and second signal outputs of the second unit phase-locked loop and formation evaluation interference are connected respectively with the first and second signal inputs of the second unit of the detection of interference and switching assessment of interference, the output of which is connected with the second input of the second myCitadel, the output of which being the output of the second channel is connected to the input of the third channel, which introduced the third block of the detection of interference and switching assessment of interference, the third myCitadel, connected in series additional myCitadel and the third block phase-locked loop and formation evaluation interference with the first input of the third vicites connected to the first input of the additional myCitadel, is the entrance to the third channel, the first and second signal outputs of the third block of phase-locked loop and formation evaluation interference are connected respectively with the first and second signal inputs of the third unit of the detection of interference and switching assessment of interference, the output of which is connected to a second input of the third vicites whose output, which is the output of the third channel is connected to the input of the fourth channel, which introduced the fourth myCitadel, the fourth block vasovski interference, the first input of the fourth vicites connected to the input of the fourth block of phase-locked loop and formation evaluation noise is input to the fourth channel, the first and second signal outputs of the fourth block of phase-locked loop and formation evaluation interference are connected respectively with the first and second signal inputs of the fourth unit of the detection of interference and switching assessment of interference, the output of which is connected to a second input of the fourth vicites whose output is the output of the fourth channel and output devices; in addition, the output of the second detection unit interference and switching assessment of interference connected with the second input of the first additional vicites first channel, the output of the third detection unit interference and switching assessment of interference connected with the second input of the first additional vicites of the second channel and the second input of the second additional vicites the first channel, the output of the fourth unit of the detection of interference and switching assessment of interference connected with the second input of vicites third channel, the second input of the second additional vicites second channel and a second input of the third additional vicites parvenu:

11, 12, 13, 14first, second, third and fourth myCitadel;

11.1, 11.2, 11.3first, second and third additional myCitadel first channel;

12.1, 12.2first and second additional myCitadel second channel;

13.1- additional myCitadel third channel;

21, 22, 23, 24the first, second, third and fourth blocks of the phase-locked loop and formation evaluation interference;

31, 32, 33, 3l4the first, second, third and fourth blocks of the detection of interference and switching assessment of interference.

The inventive device includes the following functional relationships. The proposed device consists of four series-connected channels. The input of the first channel is the input device, the output of the first channel is connected to the input of the second channel, the output of which is connected to the input of the third channel, the output of which is connected to the input of the fourth channel, the output of which is the output device.

The first channel includes a first myCitadel 11the first input which is the input of the first channel, connected to series-connected first 11.1second 11.the interim evaluation of the interference 21the first and second signal outputs which are connected respectively with the first and second signal inputs of the first block of the detection of interference and switching assessment of interference1whose output is connected to a second input of the first vicites 11whose output is the output of the first channel.

The second channel includes a second myCitadel 12the first input which is the input of the second channel connected to series-connected first 12.1and the second 12.2additional vycitalem and a second set of phase-locked loop and formation evaluation interference 22the first and second signal outputs which are connected respectively with the first and second signal inputs of the second unit of the detection of interference and switching assessment of interference2whose output is connected to the second input of the second vicites 12whose output is the output of the second channel.

The third channel includes a third myCitadel 13the first entrance is the entrance to the third channel connected to series-connected additional myCitadel 13.1and the third set of phase-locked loop and formation evaluation interference 23first, WTO, who and the detection of interference and switching assess interference 33whose output is connected to a second input of the third vicites 13whose output is the output of the third channel.

The fourth channel includes a fourth myCitadel 14the first input which is the input of the fourth channel connected to the input of the fourth block of phase-locked loop and formation evaluation interference 24the first and second signal outputs which are connected respectively with the first and second signal inputs of the fourth unit of the detection of interference and switching assess interference 34whose output is connected to a second input of the fourth vicites 14whose output is the output of the fourth channel.

In addition, the output of the second detection unit interference and switching assess interference 32connected with the second input of the first additional vicites first channel 11.1; the output of the third detection unit interference and switching assess interference 33connected with the second input of the first additional vicites second channel 12.1and the second input of the second additional vicites first channel 11.2; the output of the fourth unit of the detection of interference and switching assess interference 34connected with the second input will complement the La 12.2and a second input of the third additional vicites first channel 11.3.

The inventive device operates as follows.

The input mixture containing weak signal and four powerful interference (e.g., narrowband), carrier frequencies which lie in the swath systems of phase synchronization blocks1-24, is fed to the input of the first channel and the first input unit 11, to the second input of which is applied the estimate of the first interference generated as follows.

Input of the first channel input mixture through serially connected blocks 11.1, 11.2and 11.3to the input of block 21where is phase locked loop the frequency of the first noise and formation evaluation the first interference, which from the first signal output unit 21served on the first signal input unit 31. Simultaneously, the voltage characterizing the level of the first interference from the second signal output unit 21is supplied to the second signal input unit 31where it is compared with a threshold. In case of exceeding the threshold (commit detecting the first interference) in block 31is switching estimates for the first interference at the output of block 31where onesi.

Input mix, which offset the primary obstacle with exit block 11is input to the second channel, where it arrives at the first input block 12, to the second input of which is applied the evaluation of the second interference generated as follows.

Input mix, which offset the first obstacle, with the input of the second channel is through connected in series blocks 12.1and 12.2to the input of block 22where is phase locked loop to the frequency of the second interference and the formation of the evaluation of the second interference, which from the first signal output unit 22supplied to the first signal input unit 32. Simultaneously, the voltage characterizing the level of a second interference from the second signal output unit 22is supplied to the second signal input unit 32where it is compared with a threshold. In case of exceeding the threshold (commit detecting the second interference unit 32commutes evaluation of the second interference on its output, from where it is fed to the second input of block 12where it offsets a corresponding second obstacle in the input mixture.

The input mixture, in which the compensated first and second interference output block 12is input to trethewey, formed as follows.

The input mixture, in which the compensated first and second interference at the input of the third channel is fed through the block 13.1to the input unit 23in which phase locked loop to the frequency of the third interference and the formation of its evaluation, which from the first signal output unit 23served on the first signal input unit 33. Simultaneously, the second signal output unit 23at the second signal input unit 33voltage characterizing the level of the third interference, which is in block 33is compared with a threshold. In case of exceeding the threshold (fixation detection of the third interference) evaluation of the third interference is switched to the exit block 33where it is fed to the second input of block 13where it offsets corresponding to the third obstacle in the input mixture.

The input mixture, in which the offset of the first, second and third interference with exit block 13is input to the fourth channel, where it arrives at the first input block 14, to the second input of which is applied the evaluation of the fourth interference, which is generated as follows.

The input mixture, in which the offset of the first, second and third pomechtata fourth interference and the formation of assessments of the fourth interference, which the first signal output unit 24served on the first signal input unit 34at the second signal input from the second signal output unit 24voltage characterizing the level of the fourth interference, which is in block 34is compared with a threshold. In case of exceeding the threshold (fixation detection of the fourth interference), evaluation of the fourth interference is switched to the exit block 34where it is fed to the second input of block 14where it compensates for the corresponding fourth obstacle in the input mixture.

The input mixture, in which the offset of the first, second, third and fourth and interference with exit block 14served on the output device.

At the same time, evaluation of a second interference from the output of block 32is supplied to the second input of block 11.1where it offsets a corresponding second obstacle in the input mixture.

Evaluation of a third interference from the output of block 33is fed to the second inputs of blocks 12.1and 12.2where it offsets corresponding to the third obstacle in the input mixture.

Evaluation of the fourth interference with exit block 34is fed to the second inputs of blocks 13.1, 12.2and 11.3where it compensates for the in which the compensated second, the third and fourth interference.

To the input unit 22receives an input mix, which offset the first, third and fourth interference.

To the input unit 23receives an input mixture, in which the offset of the first, second and fourth interference.

To the input unit 24receives an input mixture, in which the offset of the first, second and third interference.

From this it follows that in the inventive device, each of the sets of phase-locked loop and formation evaluation of interference of each of the four channels (21-24works under the influence of only one noise, phase and frequency which is tracking, and the influence of the other three interference is eliminated. The output device is input mix, which offset the first, second, third and fourth interference. At the same time in the input mixture signal passes to the output device without distortion.

An example hardware implementation of block phase-locked loop and formation evaluation interference 2 included in each of the four channels of the device (see Fig.2), shown in Fig.3, where indicated:

21, 24, the first and second phase detectors;

22, 25, the first and second low pass filter;

23 - petway locked loop and formation evaluation interference 2 includes serially connected first phase detector 21, the first low pass filter 22, tunable generator 23, the phase shifter 9027 and the multiplier 26, the output of which is the first signal output unit phase-locked loop and formation evaluation noise 2, and connected in series to the second phase detector 24 and the second low pass filter 25, the output of which is the second signal output unit phase-locked loop and formation evaluation interference 2. The first signal inputs of the first 21 and second 24 phase detectors are interconnected and are the input of the phase-locked loop and formation evaluation noise 2, the output of the tunable oscillator 23 is connected with the second reference input of the first phase detector 21; the output of the phase shifter 9027 connected to the second reference input of the second phase detector 24, the output of the second low pass filter 25 is connected to the first signal input of the multiplier 26.

Unit 2 operates as follows.

Input mix input unit 2 is fed to the first signal input unit 21, the second reference input of which receives the reference voltage from the output unit 23. The result of the phase detection output of block 21 is transported is and 23, which changes its output frequency so as to ensure its tuning frequency interference. The blocks 21, 22, and 23 represent a model system phase-locked loop (see R. N. Dixon's Broadband system." Moscow. Communication, 1979, page 144, Fig. 5.15).

The input mixture is also fed to the first signal input unit 24, the second reference input of which a reference voltage from block 23 through the block 27. In block 24 is phase detection noise captured by the system phase-locked loop. The result of the phase detection output unit 24 to the input unit 25, where it is filtered. From the output unit 25, the voltage characterizing the level of captured interference, is supplied to the second signal output unit 2 and the first signal input unit 26, the second reference input voltage tunable oscillator 23 through the block 27. In block 26 is the multiplication of the voltage tunable oscillator 23, the phase of which is rotated 90in block 27, with the modulating voltage interference, the selected output unit 25. In the result output unit 26 estimation of interference. Equality of amplitude estimation noise amplitude bootblock 2 equal to one.

Structural block circuit diagram of the detection of interference and switching assess interference 3 included in each of the four channels of the device (see Fig.2), shown in Fig.4, where indicated:

31 - amplitude detector;

the 32 - unit comparison with a threshold;

33 - key.

The interference detection unit and switching assess interference 3 is connected in series amplitude detector 31, the power comparison threshold 32 and the key 33, the output of which is the output of the interference detection unit and switching assess interference 3. The first signal input unit of the detection of interference and switching assess interference 3 is connected to the first signal input key 33; a second signal input unit of the detection of interference and switching assess interference 3 is connected to the input of the amplitude detector 31.

Unit 3 operates as follows.

At the first signal input unit 3 receives the assessment of interference from the first signal output unit 2 (see Fig.2), which is supplied to the first signal input unit 33. At the second signal input unit 3 is energized, characterizing the level of interference which is received at the input unit 31, which stands out for its envelope, which output unit 31 is fed to the input of block 32, where it is compared with a threshold. Team about exceeding programsa to the output unit 33, which is the output of block 3.

The device prototype provides the possibility of compensation of only one interference, while the phase locked loop frequency interference detection and formation evaluation occurs in the context of the interfering effects of other noise, which reduces the degree of interference suppression.

The proposed device provides the possibility of compensation of four interference, while the phase locked loop to the frequency of each of the four interference, the detection of each of the four interference and the formation of its evaluation is carried out under conditions that exclude interfering influence of the other (N-1) interference, which improves the accuracy of estimation of parameters of each of the interference and, consequently, increases the degree of noise suppression.

Claims

Device for noise compensation, containing the first block of a phase-locked loop and formation evaluation interference and the first myCitadel, the first input which is the input device, characterized in that the input of the first, second, third and fourth channels; these first unit phase-locked loop and formation evaluation interference and the first myCitadel included in the first channel, which also introduced perevypolneniya myCitadel, the first input of the first additional vicites connected to the input of the first channel, and the output of the third additional vicites connected to the input of the first unit phase-locked loop and formation evaluation interference, the first and second signal outputs which are connected respectively with the first and second signal inputs of the first block of the detection of interference and switching assessment of interference, the output of which is connected with the second input of the first vicites whose output, which is the output of the first channel, connected to the input of the second channel, which introduced the second detection unit interference and switching assessment of interference, the second myCitadel, serially connected first and second additional myCitadel and the second block of phase-locked loop and formation evaluation interference, the first input of the second vicites connected to the first input of the first additional myCitadel, is the input of the second channel, the first and second signal outputs of the second unit phase-locked loop and formation evaluation interference are connected respectively with the first and second signal inputs of the second unit of the detection of interference and switching assessment of interference, the output of which is connected to vtgo channel, which introduced the third block of the detection of interference and switching assessment of interference, the third myCitadel, connected in series additional myCitadel and the third block phase-locked loop and formation evaluation interference with the first input of the third vicites connected to the first input of the additional myCitadel, is the entrance to the third channel, the first and second signal outputs of the third block of phase-locked loop and formation evaluation interference are connected respectively with the first and second signal inputs of the third unit of the detection of interference and switching assessment of interference, the output of which is connected to a second input of the third vicites whose output, which is the output of the third channel, connected to the input of the fourth channel, which introduced the fourth myCitadel, the fourth block of the phase-locked loop and formation evaluation interference and the fourth detection unit interference and switching assessment of interference with the first input of the fourth vicites connected to the input of the fourth block of phase-locked loop and formation evaluation noise is input to the fourth channel, the first and second signal outputs of the fourth block of the phase locked loop of testatika interference detection and switching assessment of interference, the output of which is connected to a second input of the fourth vicites whose output is the output of the fourth channel and output devices, in addition, the output of the second detection unit interference and switching assessment of interference connected with the second input of the first additional vicites the first channel, the output of the third detection unit interference and switching assessment of interference connected with the second input of the first additional vicites of the second channel and the second input of the second additional vicites the first channel, the output of the fourth unit of the detection of interference and switching assessment of interference connected with the second input of vicites third channel, a second input of the second additional vicites second channel and a second input of the third additional vicites first channel.

 

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