CN113824458A - Three-channel self-adaptive co-location broadband interference suppression method and system - Google Patents
Three-channel self-adaptive co-location broadband interference suppression method and system Download PDFInfo
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Abstract
The invention relates to a three-channel self-adaptive co-location broadband interference suppression method and a system, which mainly comprise two couplers and three delayers; the coupler I is used for coupling the interference signal from the transmitting antenna as a copy for the self-adaptive interference suppression system to reconstruct and receive the interference signal; the delayer I, the delayer II and the delayer III are used for carrying out time delay processing on the interference extraction signal and generating a reference signal; the electrically adjustable attenuator adjusts the amplitude of the reference signal; the synthesizer combines the signals after the amplitude adjustment to generate an interference reconstruction signal for canceling and receiving the interference signal; the coupler II cancels the interference reconstruction signal and the received interference signal and sends the cancellation residual signal to a correlator; the correlator is used for carrying out correlation operation on the reference signal and the cancellation residual signal and using an operation result for controlling the attenuation of the electrically adjustable attenuator. The system can obviously improve the broadband interference suppression performance under the conditions of limited delay matching precision and large matching error.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility, in particular to a three-channel self-adaptive co-location broadband interference suppression method and a three-channel self-adaptive co-location broadband interference suppression system which are suitable for co-location interference suppression of co-location multiple antennas.
Background
Co-located communication platforms often have a large number of antennas installed, resulting in limited isolation between antennas due to limited space. When a high-power transmitter and a broadband receiver work simultaneously, the front end of the receiver is easily saturated to reduce sensitivity and even damaged, and a useful signal cannot be normally received. The adaptive co-location interference suppression system can better counteract co-location interference and effectively protect the normal work of the receiver. The traditional adaptive co-location interference suppression system generally adopts a simple method of increasing a time delay link to improve the suppression capability of interference, particularly broadband interference. However, due to the limitations of the propagation characteristics of electromagnetic waves and the precision of the delay unit, it is difficult to ensure real-time precise matching of delay, which results in a decrease in the suppression performance of broadband interference, and the wider the interference bandwidth, the more significant the decrease. In addition, in an actual scene, a part of antennas are influenced by motion of a guide carrier platform and weather factors, and swing occurs, so that dynamic change of coupling delay between the antennas is inevitably caused, delay matching errors are increased, and broadband interference suppression performance of the adaptive interference suppression system is seriously influenced.
Disclosure of Invention
The invention mainly aims at the problem that the interference suppression performance, particularly the suppression capability of broadband interference is obviously reduced due to the time delay matching precision and the antenna swinging scene of the conventional adaptive co-location interference suppression system, and provides a broadband robust adaptive co-location interference suppression method and system with a three-channel structure. The system can obviously improve the broadband interference suppression performance under the conditions of limited delay matching precision and large matching error, enhances the adaptability of the system to complex application scenes, and specifically adopts the following technical scheme:
a three-channel adaptive co-located wideband interference suppression system, disposed between a local transmitter and a local receiver, comprising:
the multi-path power divider: the 3 paths of outputs are used for carrying out equal power distribution on the input reference signal and outputting to the delayer;
a coupler I: the power divider is used for extracting interference reference signals from a transmitting antenna and sending the interference reference signals to the power divider;
a delay group: the delay circuit comprises a plurality of delayers for carrying out delay processing on 3 paths of signals output by the power divider and sending the processed signals to an electrically adjustable attenuator and a correlator;
a correlator group: the device comprises a plurality of correlators, a signal processing unit and a signal processing unit, wherein the correlators are used for performing correlation operation on interference cancellation residual signals and reference signals, taking an operation result as a control signal of the electric adjustable attenuator and controlling the attenuation of the electric adjustable attenuator;
electrically tunable attenuator group: the device comprises a plurality of electrically adjustable attenuators, a combiner and a plurality of phase-locked loop control circuits, wherein the electrically adjustable attenuators are used for adjusting the amplitude of a reference signal after time delay and sending the adjusted signal to the combiner to generate an interference cancellation signal;
a synthesizer: the 3 paths of signals are combined and output after amplitude adjustment and are sent to a coupler I to offset and receive interference signals;
a coupler II: for canceling the composite signal with the received interference signal and feeding the remaining signal to the correlator.
In the above three-channel adaptive co-located wideband interference suppression system, the delay bank includes:
a delayer I: the device is used for performing static time delay matching on the interference extraction signal and sending the matching signal to an electric adjustable attenuator I;
a delayer II: the time delay matching circuit is used for performing time delay matching of the maximum dynamic range on one side of the interference extraction signal and sending the matching signal to the electric adjustable attenuator II;
a delayer III: and the time delay matching circuit is used for performing time delay matching of the maximum dynamic range of the other side on the interference extraction signal and sending the matching signal to the electrically adjustable attenuator III.
In the above three-channel adaptive co-located wideband interference suppression system, the correlator bank includes:
a correlator I: the device is used for carrying out correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay I to generate a control signal for controlling the electrically adjustable attenuator I and sending the control signal to the electrically adjustable attenuator I;
and a correlator II: the device is used for carrying out correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay II to generate a control signal for controlling the electrically adjustable attenuator II and sending the control signal to the electrically adjustable attenuator II;
and a correlator III: and the circuit is used for performing correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay III to generate a control signal for controlling the electrically adjustable attenuator III and sending the control signal to the electrically adjustable attenuator III.
In the above three-channel adaptive co-located wideband interference suppression system, the electrically tunable attenuator group includes:
electrically adjustable attenuator I: the amplitude adjustment device is used for adjusting the amplitude of the reference signal subjected to the time delay I, generating an output signal for synthesis and sending the output signal to the synthesizer;
an electrically adjustable attenuator II: the amplitude adjustment device is used for adjusting the amplitude of the reference signal subjected to the time delay II, generating an output signal for synthesis and sending the output signal to the synthesizer;
electrically adjustable attenuator III: and the amplitude adjustment module is used for adjusting the amplitude of the reference signal subjected to the time delay III, generating an output signal for synthesis, and sending the output signal to the synthesizer.
A method for suppressing a three-channel adaptive co-located broadband interference suppression system is characterized by comprising the following steps:
step 2, the three-path power divider performs equal power division processing on the transmitting signal extracted by the coupler I, outputs three paths of equal-amplitude in-phase reference signals, and respectively sends the three paths of equal-amplitude in-phase reference signals to the delayer I, the delayer II and the delayer III;
step 3, after the delayer I, the delayer II and the delayer III respectively carry out time delay processing on the three paths of reference signals, the three paths of signals are output and respectively sent into the electric adjustable attenuator I, the correlator I, the electric adjustable attenuator II, the correlator II, the electric adjustable attenuator III and the correlator III;
step 4, the electric adjustable attenuator I, the electric adjustable attenuator II and the electric adjustable attenuator III carry out amplitude adjustment on the three paths of input reference signals, the output is sent to a three-path synthesizer for addition operation, and the output after the operation is sent to a coupler II;
step 5, the coupler II couples the synthesized signal output by the three-way synthesizer to a receiving antenna, cancels the received interference signal, and sends the cancellation residual signal to a correlator I, a correlator II and a correlator III;
and 6, operating the cancellation residual signal output by the coupler II and the three paths of delay reference signals output by the delayer I, the delayer II and the delayer III by the correlator I, the correlator II and the correlator III, and sending an operation result to the control end of the electrically adjustable attenuator to adjust the amplitudes of the three paths of reference signals, wherein the output of the electrically adjustable attenuator is used for canceling the interference signal.
In the above method, in step 2, the reference signal passing through delay I, delay II and delay III is defined as
The interference signal is
In the method, in step 3, the signal after the delay processing is represented as:
wherein the content of the first and second substances,
represents the reference signal that has been subject to a time delay I,
representing the reference signal after a time delay II,
representing the reference signal after a time delay III,
, 
, 
delay times representing delay I, delay II and delay III.
In the above method, in step 4, the output signals of the electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III controlled by the outputs of the correlator I, the correlator II and the correlator III are output as the output signals of the combiner
Wherein the content of the first and second substances,
represents the attenuation of the electrically adjustable attenuator I,
Shows the attenuation of the electrically adjustable attenuator II,
Representing the amount of attenuation of the electrically adjustable attenuator III,
representing the synthesizer output.
In the above method, in the step 5, the interference cancellation residual signal is
Wherein the content of the first and second substances,X I(t) In order to receive the interfering signal(s),
is the amount of weighting that is applied to,
is a signal after being processed by time delay,
and e is subscript, which is the capital letter of error, and j is subscript, which indicates the number of cancellation channels.
In the above method, in the step 6, the weight amount to be calculated is calculated
That is, the attenuation of the electrically adjustable attenuator is determined by the correlator according to the following formula:
wherein the content of the first and second substances,ξ 1、ξ 2andξ 3representing the product of the cancellation residual signal and the three-way reference signal after the time delay,
is a time constant of the correlator and is,krepresenting the gain of the correlator.
Has the advantages that: in the invention, a coupler I is used for coupling an interference signal from a transmitting antenna as a copy for a self-adaptive interference suppression system to reconstruct and receive the interference signal; the delayer I, the delayer II and the delayer III are used for carrying out time delay processing on the interference extraction signal, matching the static and dynamic time delay of the antenna and generating three paths of reference signals; the electrically adjustable attenuator adjusts the amplitude of the reference signal; the synthesizer realizes the combination of the signals after the amplitude adjustment of the electrically adjustable attenuator and generates an interference reconstruction signal for canceling and receiving the interference signal; the coupler II is used for canceling the interference reconstruction signal output by the synthesizer and the received interference signal and sending the cancellation residual signal to the correlator; the correlator is used for carrying out correlation operation on the reference signal and the cancellation residual signal and using an operation result for controlling the attenuation of the electrically adjustable attenuator. The scheme can improve the broadband interference suppression performance of the self-adaptive co-location interference suppression system.
The system is used for solving the problem that the adaptive co-location interference suppression system of the co-location communication platform is sensitive to the delay matching error when the broadband interference is suppressed, and improving the suppression level of the broadband interference under the condition of large delay matching error.
Drawings
Fig. 1 is a schematic diagram of signal transmission in an application scenario according to the present invention.
Fig. 2 is a schematic diagram of a hardware connection structure according to the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the basic principle of the invention is as follows:
assume that the reference signal passing through delay I, delay II and delay III is
Suppose the interfering signal is
E isAndE iIrepresents the first of the reference signal and the interference signaliThe amplitude of the individual frequency components is,ω i is shown asiThe angular frequency of the individual frequency components,
, 
, 
delay times representing delay I, delay II and delay III,
is the amount of delay II and delay III relative to delay I,
representing the time delay of the interfering signal relative to the reference signal,nrepresenting the number of frequencies in the interfering signal.
The interference cancellation residual signal is
Wherein the content of the first and second substances,X I(t) In order to receive the interfering signal(s),
is the amount of weighting that is applied to,
is a signal after being processed by time delay,
representing the interference cancellation residual signal.
The output signals of the electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III which are output and controlled by the correlator I, the correlator II and the correlator III are output as the signals of the combiner
Wherein the weighting quantity (i.e. the attenuation of the electrically adjustable attenuator) is determined by the correlator by the following operation
WhereinkWhich is indicative of the gain of the correlator,
is a time constant of the correlator and is,ξ 1、ξ 2andξ 3representing the product of the cancellation residual signal and the three-way reference signal after the time delay, is calculated as follows
(6)
Wherein
The steady state weight can be obtained by substituting formula (6) for formula (5)W 1(∞)、W 2(∞) andW 3infinity, the steady state weight will minimize the residual interference of the system by the closed loop feedback control principle, and its substitution into equation (3) can cancel the residual
The expression of the three paths of delay output signals is shown in the formula (1)
The integral operation realized by the correlator is shown in formula (5), and physically, like a system diagram, the output of the correlator is connected with a control port of the electric adjustable attenuator through a lead;
the implementation of cancellation is expressed by formula (3) or (7), and the purpose of interference cancellation is implemented by weighting three paths of reference signals.
The technical scheme for realizing the co-location broadband interference suppression system comprises the following steps: a three-channel self-adaptive co-location broadband interference suppression system is composed of a coupler I, a three-channel power divider, a delayer, an electrically adjustable attenuator, a correlator, a synthesizer and a coupler II.
And the coupler I extracts part of the transmitting signals from the transmitting antenna to be used as interference copies processed by the self-adaptive interference suppression system, and sends the copy signals to the three-way power divider for signal shunting.
And the three-path power divider is used for dividing the interference replica signal into three paths of output reference signals which are respectively sent to the delayer I, the delayer II and the delayer III, and the three paths of reference signals have the same amplitude and phase.
And the delayer I delays one path of reference signal output by the power divider, the delay amount is determined by the static delay of the antenna, and the delayed reference signal is sent into the electric adjustable attenuator I for amplitude adjustment.
And the delayer II and the delayer III delay the two paths of reference signals output by the power divider, the delay amount is determined by the dynamic delay of the antenna, and the reference signals after the delay are sent into the electric adjustable attenuator II and the electric adjustable attenuator III to carry out amplitude adjustment.
The electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III are used for adjusting the amplitude of the reference signal output by the three-way power divider, and sending the output signal to the three-way synthesizer to generate an interference reconstruction signal and cancel the interference signal when receiving the interference signal, and the electrically adjustable attenuator is generally a bipolar electrically adjustable attenuator based on a PIN tube structure or a program-controlled step attenuator.
And the synthesizer is used for synthesizing the reference signals output by the electrically adjustable attenuator and subjected to time delay and amplitude adjustment, outputting one path of interference reconstruction signals, and sending the interference reconstruction signals to the coupler II for cancellation with the received interference signals.
And the coupler II is used for sending the interference reconstruction signal output by the synthesizer to a receiving antenna, canceling the interference reconstruction signal with the received interference signal, and sending the residual interference signal after cancellation to a correlator for correlation detection and control of the electrically adjustable attenuator.
And the correlator is used for carrying out correlation operation on the reference signal subjected to time delay and the cancellation residual signal and using an operation result to control the attenuation of the electrically adjustable attenuator to the reference signal. The correlator generally consists of a multiplier and a low-pass filter. The multiplier can be selected from chips such as AD835 and MC1954L, and the low-pass filter can be selected from chips such as ICL 7650.
The following detailed description is made with reference to the accompanying drawings.
As shown in fig. 1, the co-located communication platform has a high-power transmitter and a broadband receiver, and when two devices operate simultaneously, the transmission signal of the transmitter interferes with the normal operation of the receiver through a spatial coupling mode. The adaptive co-location interference suppression system can sample the transmission signal of a local transmitter, reconstruct a coupling interference signal through the adjustment of amplitude and phase, cancel the interference signal at a receiving end and protect the normal work of a receiver. However, the sensitivity of the conventional adaptive co-located interference suppression system to delay matching is high when the broadband interference is cancelled, and especially the broadband interference suppression capability in an antenna swinging scene is poor. The invention improves the architecture of the traditional adaptive co-location interference suppression system, adopts a three-channel adaptive interference suppression architecture, uses three delay units to perform static and dynamic matching on an antenna, combines an electrically adjustable attenuator with a related feedback control loop to realize reference signal amplitude adjustment, finally realizes reconstruction of interference signals, and improves the suppression capability of the adaptive co-location interference suppression system in a broadband interference application scene.
As shown in fig. 2, the three-channel adaptive wideband interference suppression system includes a coupler I, a power divider, a delay, a correlator, an electrically adjustable attenuator, a combiner, and a coupler II.
The coupler I is connected with the transmitting antenna, and the output end of the coupler I is connected with the three-way power divider. The coupler I extracts a transmitting signal copy from a transmitting antenna, is used as an interference extraction signal of the self-adaptive co-location interference suppression system, is used for generating a coupling interference reconstruction signal by the self-adaptive co-location interference suppression system, and realizes cancellation with a received interference signal.
The input of the three-way power divider is connected with the coupler I, the interference signals lifted by the coupler are subjected to equal-amplitude in-phase shunting, and three-way reference signals are output and respectively connected with the delayer I, the delayer II and the delayer III.
The input of the delayer I, the delayer II and the delayer III is connected with the output of the three-way power divider, the reference signal is subjected to time delay processing, and three-way time delay reference signals are output and are respectively connected with the electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III.
The inputs of the electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III are respectively connected with the outputs of the delayer I, the delayer II and the delayer III. The electric adjustable attenuator realizes the amplitude adjustment of the input signal, and the correlator controls the adjustment amount for the reconstruction of the interference signal. The electrically adjustable attenuator may be a bipolar electrically adjustable attenuator or a step attenuator. The output of the electrically adjustable attenuator is coupled to the combiner.
The input of the synthesizer is connected with the outputs of the electrically adjustable attenuator I, the electrically adjustable attenuator II and the electrically adjustable attenuator III, and the output is connected with the coupler II. The synthesizer synthesizes the input signals and outputs an interference reconstruction signal for canceling the interference reconstruction signal.
The inputs of correlator I, correlator II and correlator III are connected to the output of delayer and coupler II, respectively, and their outputs are connected to the electrically adjustable attenuator. The correlator realizes the correlation operation of the reference signal and the interference cancellation residual signal, and the attenuation of the electrically adjustable attenuator is controlled by the operation result. The correlator may be composed of a low pass filter and a multiplier.
The two inputs of the multiplier are respectively connected with the output of the delayer and the output of the coupler II, and the output is connected with the input of the low-pass filter. The multiplier realizes the multiplication operation of the reference signal and the cancellation residual signal. The alternating current quantity of the operation result is filtered by a low-pass filter, and the direct current quantity is reserved. The multiplier can select AD835, MC1954L and other chips.
The input of the low-pass filter is connected with the output of the multiplier, and the output is connected with the adjustable attenuator. The low-pass filter is used for filtering the alternating current quantity output by the multiplier, reserving the direct current quantity and controlling the electric adjustable attenuator through the direct current quantity. The low pass filter may be formed of an ICL7650 chip or the like.
The input of the coupler II is connected with the synthesizer, and the output is connected with the correlator. The coupler II cancels the interference reconstruction signal output by the synthesizer and the received interference signal, and sends the cancellation residual signal to the correlator for correlation operation.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A three-channel adaptive co-located wideband interference suppression system, disposed between a local transmitter and a local receiver, comprising:
the multi-path power divider: the 3 paths of outputs are used for carrying out equal power distribution on the input reference signal and outputting to the delayer;
a coupler I: the power divider is used for extracting interference reference signals from a transmitting antenna and sending the interference reference signals to the power divider;
a delay group: the delay circuit comprises a plurality of delayers for carrying out delay processing on 3 paths of signals output by the power divider and sending the processed signals to an electrically adjustable attenuator and a correlator;
a correlator group: the device comprises a plurality of correlators, a signal processing unit and a signal processing unit, wherein the correlators are used for performing correlation operation on interference cancellation residual signals and reference signals, taking an operation result as a control signal of the electric adjustable attenuator and controlling the attenuation of the electric adjustable attenuator;
electrically tunable attenuator group: the device comprises a plurality of electrically adjustable attenuators, a combiner and a plurality of phase-locked loop control circuits, wherein the electrically adjustable attenuators are used for adjusting the amplitude of a reference signal after time delay and sending the adjusted signal to the combiner to generate an interference cancellation signal;
a synthesizer: the 3 paths of signals are combined and output after amplitude adjustment and are sent to a coupler I to offset and receive interference signals;
a coupler II: for canceling the composite signal with the received interference signal and feeding the remaining signal to the correlator.
2. The three-channel adaptive co-located wideband interference mitigation system of claim 1, wherein the set of delays comprises:
a delayer I: the device is used for performing static time delay matching on the interference extraction signal and sending the matching signal to an electric adjustable attenuator I;
a delayer II: the time delay matching circuit is used for performing time delay matching of the maximum dynamic range on one side of the interference extraction signal and sending the matching signal to the electric adjustable attenuator II;
a delayer III: and the time delay matching circuit is used for performing time delay matching of the maximum dynamic range of the other side on the interference extraction signal and sending the matching signal to the electrically adjustable attenuator III.
3. The system of claim 2, wherein the set of correlators comprises:
a correlator I: the device is used for carrying out correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay I to generate a control signal for controlling the electrically adjustable attenuator I and sending the control signal to the electrically adjustable attenuator I;
and a correlator II: the device is used for carrying out correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay II to generate a control signal for controlling the electrically adjustable attenuator II and sending the control signal to the electrically adjustable attenuator II;
and a correlator III: and the circuit is used for performing correlation operation on the interference cancellation residual signal and the reference signal subjected to time delay III to generate a control signal for controlling the electrically adjustable attenuator III and sending the control signal to the electrically adjustable attenuator III.
4. A three channel adaptive co-located wideband interference mitigation system according to claim 3, wherein the set of electrically adjustable attenuators comprises:
electrically adjustable attenuator I: the amplitude adjustment device is used for adjusting the amplitude of the reference signal subjected to the time delay I, generating an output signal for synthesis and sending the output signal to the synthesizer;
an electrically adjustable attenuator II: the amplitude adjustment device is used for adjusting the amplitude of the reference signal subjected to the time delay II, generating an output signal for synthesis and sending the output signal to the synthesizer;
electrically adjustable attenuator III: and the amplitude adjustment module is used for adjusting the amplitude of the reference signal subjected to the time delay III, generating an output signal for synthesis, and sending the output signal to the synthesizer.
5. A three-channel adaptive co-located broadband interference suppression method using the three-channel adaptive co-located broadband interference suppression system according to any one of claims 1 to 4, comprising:
step 1, a coupler I extracts a transmitting signal from a transmitting antenna as a copy and sends the copy to a three-way power divider;
step 2, the three-path power divider performs equal power division processing on the transmitting signal extracted by the coupler I, outputs three paths of equal-amplitude in-phase reference signals, and respectively sends the three paths of equal-amplitude in-phase reference signals to the delayer I, the delayer II and the delayer III;
step 3, after the delayer I, the delayer II and the delayer III respectively carry out time delay processing on the three paths of reference signals, the three paths of signals are output and respectively sent into the electric adjustable attenuator I, the correlator I, the electric adjustable attenuator II, the correlator II, the electric adjustable attenuator III and the correlator III;
step 4, the electric adjustable attenuator I, the electric adjustable attenuator II and the electric adjustable attenuator III carry out amplitude adjustment on the three paths of input reference signals, the output is sent to a three-path synthesizer for addition operation, and the output after the operation is sent to a coupler II;
step 5, the coupler II couples the synthesized signal output by the three-way synthesizer to a receiving antenna, cancels the received interference signal, and sends the cancellation residual signal to a correlator I, a correlator II and a correlator III;
and 6, operating the cancellation residual signal output by the coupler II and the three paths of delay reference signals output by the delayer I, the delayer II and the delayer III by the correlator I, the correlator II and the correlator III, and sending an operation result to the control end of the electrically adjustable attenuator to adjust the amplitudes of the three paths of reference signals, wherein the output of the electrically adjustable attenuator is used for canceling the interference signal.
6. The method of claim 5, wherein in step 2, the reference signal passing through delay I, delay II and delay III is defined as
The interference signal is
7. The method of claim 6, wherein in step 3, the delayed signal is represented as:
wherein the content of the first and second substances,
reference representing elapsed time delay IThe signal(s) is (are) transmitted,
representing the reference signal after a time delay II,
representing the reference signal after a time delay III,
, 
, 
delay times representing delay I, delay II and delay III.
8. The method according to claim 7, wherein in step 4, the output signals of the electrically adjustable attenuator I, II and III controlled by the outputs of the correlator I, II and III are output as the output signals of the electrically adjustable attenuator I, II and III via the combiner
Wherein the content of the first and second substances,
represents the attenuation of the electrically adjustable attenuator I,
Shows the attenuation of the electrically adjustable attenuator II,
Representing the amount of attenuation of the electrically adjustable attenuator III,
representing the synthesizer output.
9. The method of claim 8, wherein in step 5, the interference cancellation residual signal is
Wherein the content of the first and second substances,X I(t) In order to receive the interfering signal(s),
is the amount of weighting that is applied to,
is a signal after being processed by time delay,
and e is subscript, which is the capital letter of error, and j is subscript, which indicates the number of cancellation channels.
10. The method of claim 9, wherein in step 6, the weighting amount of the operation is calculated
That is, the attenuation of the electrically adjustable attenuator is determined by the correlator according to the following formula:
wherein the content of the first and second substances,ξ 1、ξ 2andξ 3representing the product of the cancellation residual signal and the three-way reference signal after the time delay,
is a time constant of the correlator and is,krepresenting the gain of the correlator.
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| US20160241283A1 (en) * | 2012-05-21 | 2016-08-18 | L-3 Communications Corporation | Multiple interferer cancellation for communications systems |
| CN111600620A (en) * | 2020-03-27 | 2020-08-28 | 中国人民解放军海军工程大学 | Analog cancellation device and method for eliminating interference |
| CN113162693A (en) * | 2021-01-08 | 2021-07-23 | 北京工业大学 | Full-duplex communication system and method for eliminating radio frequency self-interference |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116208185A (en) * | 2023-05-05 | 2023-06-02 | 中国人民解放军63921部队 | Radio frequency interference suppression system of co-located platform equipment |
| CN116208185B (en) * | 2023-05-05 | 2023-08-22 | 中国人民解放军63921部队 | Radio frequency interference suppression system of co-located platform equipment |
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