CN107453783B - Adaptive co-location interference suppression system and method capable of reducing trapped wave bandwidth - Google Patents
Adaptive co-location interference suppression system and method capable of reducing trapped wave bandwidth Download PDFInfo
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Abstract
The invention discloses a self-adaptive co-location interference suppression system and a self-adaptive co-location interference suppression method capable of reducing a notch bandwidth. The detection unit and the controller are used for carrying out self-adaptive control of calculation, judgment, locking and releasing on the control quantity of the adjustable attenuator, so that the constant value of the control quantity of the adjustable attenuator is realized, the attenuation of a co-location interference suppression system to a useful signal is avoided, and the reduction of a trapped wave bandwidth is realized. The system can ensure that the received weak useful signal is not attenuated when the system offsets and receives the interference signal, thereby ensuring the normal work of the receiver.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility of communication systems, in particular to a common-address interference suppression system suitable for centralized communication stations, and specifically relates to a self-adaptive common-address interference suppression system and a method capable of reducing notch bandwidth.
Background
The concentrated communication station is often installed with a large number of communication devices, and due to the limited space and the close distance between the communication devices, the isolation between the communication transceiving systems is limited, and the requirement of electromagnetic compatibility is difficult to meet. Especially, when a high-power transmitting system works, radiated electromagnetic waves are easily coupled by adjacent receiving antennas, so that a receiver working at the same time is desensitized, even the front end is blocked, and a useful signal cannot be normally received.
After the self-adaptive co-location interference suppression system is adopted, the electromagnetic compatibility among the communication systems of the centralized communication station can be greatly improved, and the self-interference problem of a local communication transceiving system can be effectively avoided. However, due to the inherent non-ideality of the analog device, the conventional adaptive co-located interference suppression system will also generate a certain cancellation effect on the useful signal adjacent to the frequency received by the receiving system when canceling the interference signal, so that the useful signal is further attenuated before being received, and it is very easy for the receiving system to difficultly receive the useful signal normally, resulting in communication failure.
Disclosure of Invention
The purpose of the invention is: the adaptive co-located interference suppression system capable of reducing the notch bandwidth is provided for solving the problem that when the existing adaptive co-located interference suppression system has a certain notch bandwidth, a received useful signal is also used for cancellation when an interference signal is cancelled, and then the receiving system is difficult to normally receive the useful signal. The system can ensure that the received weak useful signal is not attenuated when the system offsets and receives the interference signal, thereby ensuring the normal work of the receiver.
In order to achieve the purpose, the invention adopts the technical scheme that: an adaptive co-location interference suppression system capable of reducing notch bandwidth, the co-location interference suppression system comprising a first coupler, a first quadrature power divider, a second quadrature power divider, a first adjustable attenuator, a second adjustable attenuator, a first correlator, a second correlator, a first detection unit, a second detection unit, a controller, a combiner, and a second coupler, wherein:
the coupler I extracts a transmitting signal from a transmitting system to serve as an interference extraction signal of a co-location interference suppression system and sends the interference extraction signal to the orthogonal power divider I; extracting a carrier signal and sending the carrier signal to a second orthogonal power divider;
the orthogonal power divider I is used for carrying out orthogonalization processing on the interference extraction signal, outputting two paths of orthogonal reference signals and respectively sending the two paths of orthogonal reference signals to the adjustable attenuator I, the correlator I, the adjustable attenuator II and the correlator II;
the orthogonal power divider II is used for carrying out orthogonal processing on the carrier signals, outputting two paths of orthogonal carrier signals and respectively sending the two paths of orthogonal carrier signals to the detection unit I and the detection unit II;
the first adjustable attenuator and the second adjustable attenuator are used for adjusting the amplitude of the reference signal output by the first orthogonal power divider and sending the adjusted reference signal to the synthesizer;
the synthesizer is used for synthesizing the reference signals after amplitude adjustment is carried out on the adjustable attenuators I and II to generate an interference reconstruction signal, and the interference reconstruction signal is sent to the coupler II;
the second coupler couples the interference reconstruction signal sent by the synthesizer to a receiving system, cancels the interference signal and sends the residual cancellation signal to the first correlator, the second correlator, the first detection unit and the second detection unit;
the first correlator and the second correlator are used for carrying out correlation detection on the reference signal output by the first orthogonal power divider and the offset residual signal output by the second coupler and sending a detection result to the controller;
the detection unit I and the detection unit II are used for carrying out correlation detection on the carrier signal output by the orthogonal power divider II and the offset residual signal output by the coupler II and sending a detection result to the controller;
and the controller is used for calculating and processing the output results of the detection units I and II according to the extracted carrier signal size, calculating the size of the offset residual carrier signal, comparing the size with a set value and judging the size, and controlling locking and releasing of the result sent to the correlator according to the judgment result, thereby realizing constant value control of the adjustable attenuator.
Further, the detection unit is composed of an analog multiplier and a low-pass filter.
Furthermore, the input of the analog multiplier is connected with the second output of the orthogonal power divider, the output of the analog multiplier is connected with the low-pass filter, the analog multiplier realizes the product operation of the carrier signal and the offset residual signal, the operation result comprises direct current and alternating current, the alternating current is filtered by the low-pass filter, the direct current is reserved, and the analog multiplier adopts AD834 and AD835 chips.
Furthermore, the input of the low-pass filter is connected with the output of the analog multiplier, the output of the low-pass filter is connected with the controller, the low-pass filter is used for filtering the alternating current quantity output by the analog multiplier, keeping the direct current quantity of the alternating current quantity and sending the direct current quantity to the controller, the gain of the low-pass filter is 1, and the low-pass filter adopts an OP77 chip.
Furthermore, the detection of the size of the carrier signal in the controller is finished by an AD8362 series chip, and the DSP is a C5000 or C6000 series high-speed DSP.
Further, the adjustable attenuator adopts a bipolar electrically-adjustable attenuator or a controllable step attenuator.
Further, the correlator consists of an analog multiplier and an integrator, wherein the analog multiplier adopts an MC1954L or AD835 chip, and the integrator adopts an OP77 chip.
The invention also provides a self-adaptive co-location interference suppression method capable of reducing the notch bandwidth, which adopts the co-location interference suppression system and is characterized by comprising the following steps:
firstly, extracting a small part of transmitting signals and carrier signals by a coupler I, respectively sending the small part of transmitting signals and carrier signals to an orthogonal power divider I and an orthogonal power divider II, and sending the extracted carrier signals to the orthogonal power divider II and a controller;
the second step, the orthogonal power divider carries out orthogonalization processing on the transmitting signal extracted by the coupler I, outputs two paths of orthogonal reference signals, and respectively sends the two paths of orthogonal reference signals to the adjustable attenuator I, the correlator I, the adjustable attenuator II and the correlator II;
thirdly, the orthogonal power divider performs orthogonalization processing on the carrier signals extracted by the first coupler pair, outputs two paths of orthogonal carrier extraction signals, and respectively sends the two paths of orthogonal carrier extraction signals to the first detection unit and the second detection unit;
fourthly, adjusting the amplitude of two paths of input reference signals of the first adjustable attenuator and the second adjustable attenuator, performing addition operation by a synthesizer, and outputting and sending the output to the second coupler;
fifthly, coupling the synthesized signal sent by the synthesizer to a receiving system by the coupler II, offsetting the synthesized signal with the received interference signal, and extracting the offset residual signal to the correlator I, the detection unit I, the correlator II and the detection unit II;
sixthly, the first correlator and the second correlator perform correlation operation on the offset residual signal from the second coupler and the two paths of reference signals of the first orthogonal power divider, and the operation result is sent to the controller;
seventhly, the detection unit I and the detection unit carry out correlation operation on the offset residual signal from the coupler II and the two paths of orthogonal carrier extraction signals of the orthogonal power divider II, and the operation result is sent to the controller;
eighthly, the controller performs power detection on the carrier extraction signal from the coupler I, performs carrier cancellation residual signal calculation on the carrier extraction signal and detection results sent to the controller by the detection unit I and the detection unit II, compares the calculation results with preset values, and controls locking and releasing of the detection results from the correlator I and the correlator II through comparison results;
and ninthly, the output of the controller is used for controlling the attenuation of the adjustable attenuator to realize amplitude adjustment of the input reference signal of the adjustable attenuator so as to counteract the received interference signal.
Further, in the eighth step, the control of locking and releasing the detection result is specifically: when the calculated offset residual carrier signal is detected to be smaller than a preset value, locking a correlation value, and controlling the adjustable attenuator by the correlation value; and when the calculated offset residual carrier signal is detected to be greater than the preset value, releasing the correlation value, adaptively adjusting the correlation value by the adaptive co-location interference suppression system until the calculated offset residual carrier signal is detected to be less than the preset value, and locking the correlation value again.
Further, the specific implementation principle of the method can be expressed as follows:
assuming that a reference signal output by a quadrature power divider is:
the carrier orthogonal extraction signal output by the corresponding orthogonal power divider II is as follows:
the interference cancellation residual signal is:
wherein z isiIs the amplitude, omega, of a frequency component contained in the reference signaliIs the angular frequency, z, of a frequency component contained in the reference signaljIs where the carrier wave extracts the signal amplitude, ωjFor carrier signal angular frequency, IiIs the amplitude of the frequency component of the residual interference signal, DlIs the amplitude, ω, of the frequency component of the residual useful signallThe angular frequency of the frequency component contained in the useful signal;
the following results are obtained through the first detection unit and the second detection unit:
the detection cancellation residual carrier calculated by the controller is:
the detection value is compared with a set value and the output value of the correlator is locked, so that the adjustable constant value control is realized, and the useful signal is ensured not to be attenuated.
Compared with the prior art, the invention has the beneficial effects that: the coupler is used for extracting a small quantity of transmitting signals from a transmitting system to serve as interference reference signals of a co-location interference suppression system and extracting carrier signals; the first orthogonal power divider realizes the orthogonalization processing of interference reference signals and generates two orthogonal reference signals; the second orthogonal power divider realizes the orthogonalization processing of the carrier extraction signals and generates two orthogonal carrier signals; the adjustable attenuator realizes the amplitude adjustment of the reference signal; the synthesizer is used for synthesizing the reference signal after the amplitude is adjusted into an interference cancellation signal; the coupler is used for synthesizing an output signal and canceling a received interference signal, and sending a cancellation residual signal to a correlator and a detection unit; the detection unit is used for carrying out correlation operation and detection on the offset residual signal and the orthogonal carrier signal; the controller is used for detecting the magnitude of the carrier signal, calculating the magnitude of the carrier signal and the data sent by the detection unit to obtain the magnitude of the offset residual carrier signal, comparing the magnitude of the offset residual carrier signal with a set value, judging, controlling the locking and releasing of the correlation value sent by the correlator according to the judgment result, and using the control result for controlling the adjustable attenuator. The scheme can reduce the notch bandwidth of the co-located interference suppression system and avoid the attenuation of useful signals.
The system can be used for solving the problem of attenuation of useful signals caused by the operation of the self-adaptive co-location interference suppression system of the centralized communication station, further reducing the transceiving frequency difference and improving the utilization rate of frequency spectrum resources.
Drawings
FIG. 1 is a schematic diagram of an example of the present invention.
FIG. 2 is a schematic diagram of an embodiment of the present invention.
FIG. 3 is a schematic diagram of a detecting unit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
As shown in fig. 1, the centralized communication platform has two communication transceiving systems with adjacent frequencies, the receiving system receives a useful signal transmitted by the distant transmitting system, and the high-power signal transmitted by the local transmitting system is spatially coupled to the receiving system, so that the receiving system is interfered and cannot normally receive the useful signal. The adaptive co-located interference suppression system can sample interference signals from the transmitting system, reconstruct received interference signals through adaptive feedback control, and cancel interference at the receiving end. However, the conventional adaptive co-located interference suppression system has a certain notch bandwidth, and when the frequency of the useful signal is covered, the useful signal is attenuated, which increases the difficulty of the receiving system in detecting the useful signal. The carrier detection and processing department is added on the traditional co-location interference suppression system, the size of the offset residual carrier signal can be detected in real time in the interference offset process, and is compared and judged with a set value, and the control quantity of the adjustable attenuator output by the correlator is locked, so that the constant value control of the adjustable attenuator is realized, the trapped wave bandwidth of the co-location interference suppression system is reduced, and useful signals are guaranteed not to be offset and attenuated.
As shown in fig. 2 and fig. 3, the adaptive co-located interference suppression system for reducing notch bandwidth includes a coupler 1, a quadrature power divider, a detection unit, a correlator, a controller, an adjustable attenuator, a combiner, and a coupler 2.
The coupler 1 is connected with the transmitting system, and the output end is connected with the orthogonal power divider. The coupler 1 extracts a small amount of transmitting signals from a transmitting system, and the transmitting signals are used as interference extraction signals of a co-location interference cancellation system, are used for generating reconstruction signals of received interference signals by the co-location interference suppression system, and realize cancellation with the received interference signals; the coupler 1 also extracts the carrier signal and sends the carrier signal to the orthogonal power divider 2 and the controller for the operation processing of the decision data.
The input of the orthogonal power divider 1 is connected with the coupler 1, the interference extraction signal is processed in an orthogonal mode, two paths of orthogonal reference signals are output and are respectively connected with the adjustable attenuator 1, the correlator 1, the adjustable attenuator 2, the correlator 2 and the controller.
The input of the orthogonal power divider 2 is connected with the coupler 1, carries out orthogonal processing on the carrier extraction signal, outputs two paths of orthogonal carrier signals, and is respectively connected with the detection unit 1 and the detection unit 2.
The input of the adjustable attenuator 1 and the input of the adjustable attenuator 2 are connected with the output of the orthogonal power divider 1, and the output is connected with the synthesizer. The adjustable attenuator realizes the amplitude adjustment of the input reference signal, and then realizes the amplitude and phase adjustment of the output signal of the synthesizer, and the adjustment amount is output and controlled by the controller. The adjustable attenuator can adopt a step attenuator or a bipolar electrically-adjusted attenuator.
Two inputs of the correlator 1 and the correlator 2 are respectively connected with the output of the orthogonal power divider 1 and the output of the coupler 2, and the outputs are connected with the controller. The correlator realizes the detection of the correlation value of the orthogonal reference signal and the interference cancellation residual signal, and sends the detection result to the controller, and the locking and releasing control is implemented by the operation judgment result of the controller, and the control result is used for controlling the attenuation of the adjustable attenuator. The correlator may be comprised of an analog multiplier and an integrator.
The two inputs of the analog multiplier are respectively connected with the output of the orthogonal power divider 1 and the output of the coupler 2, and the output is connected with the input of the integrator. The analog multiplier realizes multiplication operation of the reference signal and the offset residual signal. The operation result contains alternating current and direct current, the alternating current is filtered by the integrator, and the direct current is reserved. The analog multiplier can adopt chips such as MC1954L and AD 835.
The integrator input is coupled to the analog multiplier output and the output is coupled to the controller. The integrator is used for filtering the alternating current quantity output by the analog multiplier, reserving the direct current quantity of the alternating current quantity and sending the direct current quantity to the controller. The integrator may be formed using a chip such as OP 77.
The input of the detection unit is connected with the output of the orthogonal power divider 2, and the output is connected with the controller. The detection unit is used for the correlation detection of the orthogonal carrier signal and the offset residual signal, and the detection value is sent to the controller, and the controller carries out operation and judgment. The detection unit is composed of an analog multiplier and a low-pass filter.
The input of the analog multiplier is connected with the output of the orthogonal power divider 2, and the output is connected with the low-pass filter. The analog multiplier realizes the product operation of the carrier extraction signal and the offset residual signal, the operation result comprises direct current quantity and alternating current quantity, the alternating current quantity is filtered by the low-pass filter, and the direct current quantity is reserved. The analog multiplier can adopt chips such as AD834 and AD 835.
The input of the low-pass filter is connected with the output of the analog multiplier, and the output of the low-pass filter is connected with the controller. The low-pass filter is used for filtering the alternating current quantity output by the analog multiplier, reserving the direct current quantity of the low-pass filter, and sending the direct current quantity to the controller, and the gain of the low-pass filter is 1. The low-pass filter can be formed by using chips such as OP 77.
The input of the controller is connected with the coupler 1, the correlator and the output of the detection unit, and the output is connected with the adjustable attenuator. The controller detects the carrier extraction signal in real time, performs operation processing with the input result of the detection unit to obtain a real-time signal for offsetting the size of the residual carrier signal, and compares the real-time signal with a set value and judges the real-time signal. If the offset residual carrier signal is smaller than the set value, locking the correlation value input by the correlator, and controlling the adjustable attenuator by the value to realize constant value control; if the offset residual carrier signal is greater than the set value, releasing the locking value, inputting the correlation value by the correlator to directly control the adjustable attenuator until the detected offset residual carrier signal is less than the set value, locking the correlation value input by the correlator, and controlling the constant value of the adjustable attenuator by the value. The carrier signal detection unit in the controller can be formed by an AD8362 series chip, and the DSP can be a C5000 or C6000 series high-speed DSP.
The input of the synthesizer is connected with the outputs of the adjustable attenuator 1 and the adjustable attenuator 2, and the output is connected with the coupler 2. The synthesizer realizes the synthesis of the output signal of the adjustable attenuator, and the synthesized signal and the received interference signal have equal amplitude and opposite phase so as to counteract the received interference signal.
The input of the coupler 2 is connected with the synthesizer, and the output is connected with the correlator, the detection unit and the receiving system. The coupler 2 cancels the synthesized signal and the received interference signal, and sends the residual signal to the correlator and the detection unit for correlation detection processing.
The method for realizing the self-adaptive co-location interference suppression system comprises the following steps:
in the first step, a coupler 1 extracts a small part of a transmission signal and a carrier signal, and sends the small part of the transmission signal and the carrier signal to an orthogonal power divider 1 and an orthogonal power divider 2 respectively, and sends the extracted carrier signal to the orthogonal power divider 2 and a controller.
And secondly, the orthogonal power divider 1 orthogonalizes the transmitting signal extracted by the coupler 1, outputs two paths of orthogonal reference signals and respectively sends the two paths of orthogonal reference signals to the adjustable attenuator 1, the correlator 1, the adjustable attenuator 2 and the correlator 2.
And thirdly, the orthogonal power divider 2 performs orthogonalization processing on the carrier signals extracted by the coupler 1, outputs two paths of orthogonal carrier extraction signals and respectively sends the two paths of orthogonal carrier extraction signals to the detection unit 1 and the detection unit 2.
And fourthly, the adjustable attenuator 1 and the adjustable attenuator 2 adjust the amplitude of the two paths of input reference signals, the two paths of input reference signals are added by a synthesizer, and the output signals are sent to the coupler 2.
Fifthly, the coupler 2 couples the synthesized signal sent by the synthesizer to the receiving system, cancels the received interference signal, and extracts the cancellation residual signal to the correlator 1, the detection unit 1, the correlator 2 and the detection unit 2.
And sixthly, the correlator 1 and the correlator 2 perform correlation operation on the offset residual signal from the coupler 2 and the two paths of reference signals of the orthogonal power divider 1, and the operation result is sent to the controller.
Seventhly, the detection unit 1 and the detection unit 2 perform correlation operation on the offset residual signal from the coupler 2 and the two paths of orthogonal carrier extraction signals of the orthogonal power divider 2, and send the operation result to the controller.
And eighthly, the controller performs power detection on the carrier extraction signal from the coupler 1, performs carrier cancellation residual signal calculation on the carrier extraction signal and the detection results sent into the controller by the detection unit 1 and the detection unit 2, compares the calculation results with preset values, and controls locking and releasing of the detection results from the correlator 1 and the correlator 2 according to the comparison results. When the calculated offset residual carrier signal is detected to be smaller than a preset value, locking a correlation value, and controlling the adjustable attenuator by the correlation value; and when the calculated offset residual carrier signal is detected to be greater than the preset value, releasing the correlation value, adaptively adjusting the correlation value by the adaptive co-location interference suppression system until the calculated offset residual carrier signal is detected to be less than the preset value, and locking the correlation value again.
And ninthly, the output of the controller is used for controlling the attenuation of the adjustable attenuator to realize amplitude adjustment of the input reference signal of the adjustable attenuator so as to counteract the received interference signal.
Through the steps, the system forms an adaptive co-located interference suppression system capable of reducing the notch bandwidth. The amplitude adjustment of the interference extraction reference signal is realized by the adjustable attenuator, so that the amplitude and phase adjustment of the synthesized signal is realized, an interference reconstruction signal with the same amplitude and phase as the received interference signal is finally obtained, and the interference reconstruction signal is cancelled with the received interference signal to realize the interference suppression. The detection unit and the controller are used for carrying out self-adaptive control of calculation, judgment, locking and releasing on the control quantity of the adjustable attenuator, so that the constant value of the control quantity of the adjustable attenuator is realized, the attenuation of a co-location interference suppression system to a useful signal is avoided, and the reduction of a trapped wave bandwidth is realized.
The basic principle of the invention is as follows:
suppose the reference signal output by the quadrature power divider 1 is
The carrier quadrature extraction signal output by the corresponding quadrature power divider 2 is
The interference cancellation residual signal is
Wherein z isiIs the amplitude, omega, of a frequency component contained in the reference signaliIs the angular frequency, z, of a frequency component contained in the reference signaljIs where the carrier wave extracts the signal amplitude, ωjFor carrier signal angular frequency, IiIs the amplitude of the frequency component of the residual interference signal, DlIs the amplitude, ω, of the frequency component of the residual useful signallIs the angular frequency of the frequency components contained in the useful signal.
Through the detection unit 1 and the detection unit 2
The controller calculates the detected offset residual carrier as
The detection value is compared with a set value and the output value of the correlator is locked, so that the adjustable constant value control is realized, and the useful signal is ensured not to be attenuated.
The invention adds a carrier detection processing unit and a controller part on the traditional co-location interference suppression system, the carrier detection unit obtains the relevant value information of the carrier and the offset residual signal, and the digital controller calculates the size of the offset residual carrier as the basis of comparison and judgment, and realizes constant value control on the adjustable attenuator according to the judgment result, thereby reducing the trapped wave bandwidth of the system, avoiding the offset of useful signals and ensuring the normal receiving processing of the receiving system on weak useful signals. The invention can reduce the receiving and transmitting frequency difference between the communication systems of the centralized communication stations and improve the utilization rate of frequency spectrum resources.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An adaptive co-location interference suppression system capable of reducing notch bandwidth, the co-location interference suppression system comprising a first coupler, a first quadrature power divider, a second quadrature power divider, a first adjustable attenuator, a second adjustable attenuator, a first correlator, a second correlator, a first detection unit, a second detection unit, a controller, a combiner, and a second coupler, wherein:
the coupler I extracts a transmitting signal from a transmitting system to serve as an interference extraction signal of a co-location interference suppression system and sends the interference extraction signal to the orthogonal power divider I; extracting a carrier signal and sending the carrier signal to a second orthogonal power divider;
the orthogonal power divider I is used for carrying out orthogonalization processing on the interference extraction signal, outputting two paths of orthogonal reference signals and respectively sending the two paths of orthogonal reference signals to the adjustable attenuator I, the correlator I, the adjustable attenuator II and the correlator II;
the orthogonal power divider II is used for carrying out orthogonal processing on the carrier signals, outputting two paths of orthogonal carrier signals and respectively sending the two paths of orthogonal carrier signals to the detection unit I and the detection unit II;
the first adjustable attenuator and the second adjustable attenuator are used for adjusting the amplitude of the reference signal output by the first orthogonal power divider and sending the adjusted reference signal to the synthesizer;
the synthesizer is used for synthesizing the reference signals after amplitude adjustment is carried out on the adjustable attenuators I and II to generate an interference reconstruction signal, and the interference reconstruction signal is sent to the coupler II;
the second coupler couples the interference reconstruction signal sent by the synthesizer to a receiving system, cancels the interference signal and sends the residual cancellation signal to the first correlator, the second correlator, the first detection unit and the second detection unit;
the first correlator and the second correlator are used for carrying out correlation detection on the reference signal output by the first orthogonal power divider and the offset residual signal output by the second coupler and sending a correlation value to the controller;
the detection unit I and the detection unit II are used for carrying out correlation detection on the carrier signal output by the orthogonal power divider II and the offset residual signal output by the coupler II and sending a detection result to the controller;
the controller is used for calculating and processing the output results of the detection units I and II according to the extracted carrier signal size, calculating the size of the offset residual carrier signal, comparing the size with a preset value and judging the size, and controlling the locking and releasing of a correlation value sent to the controller by the correlator according to the judgment result so as to realize the constant value control of the adjustable attenuator;
the control of locking and releasing the correlation values is specifically: when the calculated offset residual carrier signal is detected to be smaller than a preset value, locking a correlation value, and controlling the adjustable attenuator by the correlation value; when the calculated offset residual carrier signals are detected to be larger than a preset value, releasing the correlation value, adaptively adjusting the correlation value by the adaptive co-located interference suppression system until the calculated offset residual carrier signals are detected to be smaller than the preset value, and locking the correlation value again;
the system implementation principle is expressed as follows:
assuming that a reference signal output by a quadrature power divider is:
the orthogonal carrier signals output by the corresponding orthogonal power divider II are as follows:
the interference cancellation residual signal is:
wherein z isiIs the amplitude, omega, of a frequency component contained in the reference signaliIs the angular frequency, z, of a frequency component contained in the reference signaljIs where the carrier wave extracts the signal amplitude, ωjFor carrier signal angular frequency, IiIs the amplitude of the frequency component of the residual interference signal, DlIs the amplitude, ω, of the frequency component of the residual useful signallThe angular frequency of the frequency component contained in the useful signal;
the following results are obtained through the first detection unit and the second detection unit:
the detection cancellation residual carrier calculated by the controller is:
the detection value is compared with a preset value and the output value of the correlator is locked, so that the constant value control of the adjustable attenuator is realized, and the useful signal is ensured not to be attenuated.
2. The adaptive co-located interference mitigation system that reduces notch bandwidth of claim 1, wherein the detection unit is comprised of an analog multiplier and a low pass filter.
3. The adaptive co-site interference suppression system capable of reducing the notch bandwidth as claimed in claim 2, wherein the input of the analog multiplier is connected to the two outputs of the quadrature power divider, the output is connected to the low pass filter, the analog multiplier performs the multiplication of the carrier signal and the cancellation residual signal, the calculation result includes a dc component and an ac component, the ac component is filtered by the low pass filter, the dc component is retained, and the analog multiplier employs an AD834 or an AD835 chip.
4. An adaptive co-site interference suppression system capable of reducing notch bandwidth as claimed in claim 2 or 3, wherein said low pass filter has an input connected to the output of the analog multiplier and an output connected to the controller, the low pass filter is used to filter the ac value output from the analog multiplier, retain its dc value and send the dc value to the controller, the gain of the low pass filter is 1, and the low pass filter uses OP77 chip.
5. The adaptive co-site interference mitigation system of claim 1, wherein the detection of the magnitude of the carrier signal in the controller is performed by an AD8362 series chip, and the DSP is selected from a C5000 or C6000 series high speed DSP.
6. The adaptive co-located interference suppression system with notch bandwidth reduction of claim 1, wherein the adjustable attenuator is a bipolar electrically adjusted attenuator or a controllable step attenuator.
7. The adaptive co-site interference suppression system capable of reducing notch bandwidth as claimed in claim 1, wherein said correlator comprises an analog multiplier and an integrator, the analog multiplier employs MC1954L or AD835 chip, and the integrator employs OP77 chip.
8. An adaptive co-location interference suppression method capable of reducing notch bandwidth, using the co-location interference suppression system of claim 1, the method comprising the steps of:
the first step, a small part of transmitting signals and carrier signals are extracted by a coupler I, the extracted transmitting signals are sent to an orthogonal power divider, and the extracted carrier signals are sent to an orthogonal power divider II and a controller;
the second step, the orthogonal power divider carries out orthogonalization processing on the transmitting signal extracted by the coupler I, outputs two paths of orthogonal reference signals, and respectively sends the two paths of orthogonal reference signals to the adjustable attenuator I, the correlator I, the adjustable attenuator II and the correlator II;
thirdly, the orthogonal power divider performs orthogonalization processing on the carrier signals extracted by the first coupler pair, outputs two paths of orthogonal carrier extraction signals, and respectively sends the two paths of orthogonal carrier extraction signals to the first detection unit and the second detection unit;
fourthly, adjusting the amplitude of two paths of input reference signals of the first adjustable attenuator and the second adjustable attenuator, performing addition operation by a synthesizer, and outputting and sending the output to the second coupler;
fifthly, coupling the synthesized signal sent by the synthesizer to a receiving system by the coupler II, offsetting the synthesized signal with the received interference signal, and extracting the offset residual signal to the correlator I, the detection unit I, the correlator II and the detection unit II;
sixthly, the first correlator and the second correlator perform correlation operation on the offset residual signal from the second coupler and the two paths of reference signals of the first orthogonal power divider, and the operation result is sent to the controller;
seventhly, the detection unit I and the detection unit carry out correlation operation on the offset residual signal from the coupler II and the two paths of orthogonal carrier extraction signals of the orthogonal power divider II, and the operation result is sent to the controller;
eighthly, the controller performs power detection on the carrier extraction signal from the coupler I, performs carrier cancellation residual signal calculation on the carrier extraction signal and detection results sent to the controller by the detection unit I and the detection unit II, compares the calculation results with preset values, and controls locking and releasing of the detection results from the correlator I and the correlator II through comparison results;
and ninthly, the output of the controller is used for controlling the attenuation of the adjustable attenuator to realize amplitude adjustment of the input reference signal of the adjustable attenuator so as to counteract the received interference signal.
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| CN112953578B (en) * | 2021-01-22 | 2022-07-29 | 成都天奥信息科技有限公司 | Optimization method of ground-air communication self-adaptive radio frequency interference canceller |
| CN114157387B (en) * | 2021-11-30 | 2024-04-09 | 湖北工业大学 | Self-adaptive co-location interference cancellation system and method with auxiliary channel |
| CN114157386A (en) * | 2021-11-30 | 2022-03-08 | 湖北工业大学 | Four-channel robust adaptive co-location interference cancellation system and method |
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| CN105812019A (en) * | 2016-04-29 | 2016-07-27 | 湖北工业大学 | Adaptive null-steering beam bandwidth self-leakage signal suppression system and method |
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