CN111431560A - Anti-strong interference device and method based on IIR filter - Google Patents
Anti-strong interference device and method based on IIR filter Download PDFInfo
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- CN111431560A CN111431560A CN202010220430.XA CN202010220430A CN111431560A CN 111431560 A CN111431560 A CN 111431560A CN 202010220430 A CN202010220430 A CN 202010220430A CN 111431560 A CN111431560 A CN 111431560A
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H04B2001/7152—Interference-related aspects with means for suppressing interference
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Abstract
The embodiment of the invention provides an anti-strong interference device and method based on an IIR filter, and the method comprises the steps of obtaining an input signal, carrying out debounce on the input signal and a frequency hopping pattern prestored in a down-conversion unit through the down-conversion unit to obtain baseband data, and carrying out extraction processing on the baseband data to obtain the extracted baseband data; performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain an anti-interference signal; and carrying out nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal. The anti-interference processing is carried out on the extracted baseband data through the anti-aliasing interference filtering unit formed by cascading a plurality of IIR filters, and meanwhile, the group delay compensation is carried out aiming at different frequency point nonlinear phases caused by the anti-aliasing interference filtering unit through the phase compensation unit, so that the strong interference of a frequency hopping system is effectively resisted.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a strong interference resisting device and method based on an IIR filter.
Background
The frequency hopping communication system has high evasion and interception resistance, can be applied to communication systems of intelligent ammunition, unmanned aerial vehicles, unmanned boats, unmanned vehicles and low-orbit satellites, and resists interference to ensure accurate data transmission.
In a frequency hopping communication system, two communication parties agree on a frequency hopping pattern and transmit different symbols at multiple frequencies, so that the signal robustness is enhanced, and the higher the hopping speed is, the stronger the capability of resisting interference avoidance is. Therefore, under the condition that the symbol rate and the number of frequency hopping points are not changed, the spreading ratio is positively correlated with the bandwidth and the anti-interference capability. Along with the improvement of logic storage resources in the software radio platform, the radio frequency front end wide-open system sampling is facilitated when the frequency hopping communication system is realized, the multi-frequency point down-conversion function is realized in the software radio platform, and the frequency hopping system with strong anti-interference capability and flexible and variable frequency hopping patterns can be realized.
However, when the wide-open frequency hopping sampling system performs instantaneous down-conversion in the software radio platform, the synchronization signal needs to be extracted and transmitted to the subsequent synchronization algorithm unit, so that aliasing interference or out-of-band interference caused by the extraction algorithm cannot be ignored, and especially under the condition of large power of an interfered frequency point, it is necessary to add a high-impedance filter bank with a high-impedance rejection degree before the synchronization signal processing. The general implementation method of the anti-interference filter bank is to adopt a non-recursive filter, but the tap coefficient of a high-order suppression system is extremely high, and the complexity of the implementation resource is high.
Therefore, how to better solve the problem of aliasing interference or out-of-band interference caused by the decimation algorithm has become an urgent problem to be solved in the industry.
Disclosure of Invention
Embodiments of the present invention provide an IIR filter-based strong interference rejection apparatus and method, so as to solve the technical problems mentioned in the above background art, or at least partially solve the technical problems mentioned in the above background art.
In a first aspect, an embodiment of the present invention provides an IIR filter-based strong interference rejection apparatus, including: the device comprises a down-conversion unit, an anti-aliasing interference filtering unit and a phase compensation unit;
the down-conversion unit is used for de-hopping the frequency hopping pattern into baseband data, extracting the baseband data to obtain extracted baseband data, and sending the extracted baseband data to the anti-aliasing interference filtering unit;
the anti-aliasing interference filtering unit is used for performing interference suppression on the extracted baseband data to obtain an anti-interference signal and sending the anti-interference signal to the phase compensation unit;
the phase compensation unit is used for carrying out nonlinear phase group delay compensation on the anti-interference signal to obtain a nonlinear compensation output signal.
More specifically, the apparatus further comprises: a matched filtering unit and a synchronous processing unit;
the matched filtering unit receives the nonlinear compensation output signal sent by the phase compensation unit, performs matched filtering to obtain a matched filtering output signal, and sends the matched filtering output signal to the synchronous processing unit;
the synchronous processing unit is used for carrying out synchronous processing on the matched filtering output signal.
More specifically, the phase compensation unit is specifically configured to:
determining phase information corresponding to each frequency point in the frequency hopping pattern according to the phase frequency characteristic information of the IIR filter;
generating a frequency hopping pattern delay lookup table according to the phase information corresponding to each frequency point in the frequency hopping pattern and the preset delay time;
and performing nonlinear phase group delay compensation according to the frequency hopping pattern delay lookup table.
More specifically, the anti-aliasing interference filtering unit is composed of a plurality of IIR filters in cascade connection.
In a second aspect, an embodiment of the present invention provides a strong interference resisting method for applying the IIR filter-based strong interference resisting apparatus in the first aspect, including:
acquiring an input signal, generating a frequency hopping pattern according to the input signal through the down-conversion unit, carrying out debounce on the frequency hopping pattern to obtain baseband data, and carrying out extraction processing on the baseband data to obtain extracted baseband data;
performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain anti-interference information;
and carrying out nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
More specifically, the step of performing nonlinear phase group delay compensation on the anti-interference signal by the phase compensation unit to obtain a nonlinear compensation output signal specifically includes:
determining the switching delay time information of each frequency point of the frequency hopping pattern according to the frequency hopping pattern delay lookup table;
carrying out nonlinear phase group delay compensation on the anti-interference signal according to the switching delay time information of each frequency point of the frequency hopping pattern to obtain a nonlinear compensation output signal;
and the frequency hopping pattern delay lookup table is generated according to the phase information corresponding to each frequency point in the frequency hopping pattern and the preset delay time.
More specifically, the step of performing interference suppression on the decimated baseband data by the anti-aliasing interference filtering unit specifically includes:
and inputting the extracted baseband data into an anti-aliasing interference filtering unit, and inhibiting narrow-band interference, single-tone interference, multi-tone interference and aliasing interference.
In a third aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the strong interference resisting method according to the second aspect when executing the program.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the anti-strong interference method according to the second aspect.
According to the anti-strong-interference device and method based on the IIR filter, anti-interference processing is performed on extracted baseband data through an anti-aliasing interference filtering unit formed by cascading a plurality of IIR filters, meanwhile group delay compensation is performed on different frequency point nonlinear phases caused by the anti-aliasing interference filtering unit through a phase compensation unit, and therefore strong interference of a frequency hopping system is effectively resisted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an IIR filter-based anti-interference apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an IIR filter-based anti-interference apparatus according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an anti-aliasing interference filtering unit according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating a method for anti-interference according to an embodiment of the present invention;
fig. 5 is a simulation diagram of an interference-free bit error rate of three frequency hopping receiving systems of an FIR, IIR, and IIR compensation systems according to an embodiment of the present invention;
FIG. 6 is a simulation diagram of the bit error rate under 30dB full-bandwidth interference of three frequency hopping receiving systems of the FIR, IIR and IIR compensation systems described in the embodiment of the present invention;
FIG. 7 is a simulation diagram of the error rate under 40dB narrow-band interference of three frequency hopping receiving systems of FIR, IIR and IIR compensation systems described in the embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The resulting aliasing or out-of-band interference for the decimation process is now explained as follows:
let the baseband signal be
x(n)＝x(t)|t＝nTs，
If the extraction multiple is N, the extracted signal is y (N) ═ x (Nn),
the expression of Fourier is
The physical meaning is that the signal is periodically extended at intervals of 2 pi/N on the frequency spectrum. Let the maximum frequency of the signal be fcOriginal sampling rate of fsIf Nfc>fsThen interference outside the effective bandwidth may be aliased into the effective bandwidth causing interference. In addition, the out-of-band interference affects the rest of the frequency points, so a filter with high-order stop-band rejection is required.
Fig. 1 is a schematic structural diagram of an IIR filter-based strong interference rejection apparatus according to an embodiment of the present invention, as shown in fig. 1, including: a down-conversion unit 110, an anti-aliasing interference filtering unit 120 and a phase compensation unit 130.
The down-conversion unit 110 is configured to de-hop the frequency hopping pattern into baseband data, perform extraction processing on the baseband data to obtain extracted baseband data, and send the extracted baseband data to the anti-aliasing interference filtering unit 120;
the anti-aliasing interference filtering unit 120 is configured to perform interference suppression on the extracted baseband data to obtain an anti-interference signal, and send the anti-interference signal to the phase compensation unit 130;
the phase compensation unit 130 is configured to perform nonlinear phase group delay compensation on the anti-interference signal to obtain a nonlinear compensation output signal.
Specifically, the anti-aliasing interference filtering unit described in the embodiment of the present invention is formed by using a cascade structure of a plurality of IIR filters, wherein each basic section is a pair of zero poles, which is convenient for adjusting each basic section individually.
After the extracted baseband data is input into the anti-aliasing interference filtering unit, the anti-aliasing interference filtering unit can generate nonlinear phases for different frequency points, even if the phases are ensured to change from fixed phases when the frequency hopping points of the transmitting end are switched, the phase relation of a plurality of frequency hopping points is not fixed any more after passing through the channel and the nonlinear processing unit, and coherent reception cannot be realized.
The phase compensation unit described in the embodiments of the present invention calls a frequency hopping pattern delay look-up table when switching frequency hopping points, and sequentially performs phase compensation delay when switching frequency hopping points, where the frequency hopping pattern delay look-up table described herein refers to a method of estimating a phase T corresponding to each frequency in a frequency hopping pattern by plotting phase-frequency characteristics of an IIR filter in MAT L AB, fitting a curve with a polyfit function, and estimating a phase T corresponding to each frequency in the frequency hopping patterndSequentially delaying (2 pi-T) at the switching of the hopping pointsd) Time.
In one embodiment of the present invention, let the interference be J, the algorithm goes through N times of decimation, and Nf is analyzed belowc>fsIn the case where aliasing interference and some narrow-band interference are out-of-band interferenceUnder the condition, the received signal passes through the anti-aliasing interference filtering unit and then influences on coherent reception.
Suppose the input signal is
wiWhich represents a frequency hopping pattern that is,
indicating that each frequency bin has a fixed initial phase.
The input signal of the anti-aliasing interference filtering unit is r (t) ═ s (t) + n (t) + J (t),
n (t) is additive white Gaussian noise, and J (t) is interference.
For the anti-aliasing interference filtering unit, after the input signal passes through the filtering unit, the output signal result is
Wherein KIWith wiThe change is changed so that the results of the multiple outputs are added together directly and the phase relationship between the individual hops is no longer unambiguous. So the phase corresponding to each frequency hopping point is used as a compensation factor
So that
So that it can be used as data input for a coherent algorithm receiver. Otherwise, the received signal with random phase is received by non-coherent method, and the signal-to-noise ratio is lost. Therefore, when the IIR filter is selected as the anti-interference processing unit, a phase compensation unit is required to be added. .
According to the embodiment of the invention, the anti-interference processing is carried out on the extracted baseband data through the anti-aliasing interference filtering unit formed by cascading a plurality of IIR filters, and meanwhile, the group delay compensation is carried out on the nonlinear phases of different frequency points caused by the anti-aliasing interference filtering unit through the phase compensation unit, so that the strong interference of a frequency hopping system is effectively resisted.
On the basis of the above embodiment, the apparatus further includes: a matched filtering unit and a synchronous processing unit;
the matched filtering unit receives the nonlinear compensation output signal sent by the phase compensation unit, performs matched filtering to obtain a matched filtering output signal, and sends the matched filtering output signal to the synchronous processing unit;
the synchronous processing unit is used for carrying out synchronous processing on the matched filtering output signal.
Specifically, fig. 2 is a schematic structural diagram of an IIR filter-based anti-strong-interference apparatus according to another embodiment of the present invention, as shown in fig. 2, the apparatus includes an AD unit 210, a down-conversion unit 110, an anti-aliasing interference filtering unit 120, a phase compensation unit 130, a matching filtering unit 220, and a synchronization processing unit 230.
The AD unit 210 described in the embodiment of the present invention refers to a circuit module that converts an analog signal into a digital signal.
The matched filtering unit 220 described in the embodiment of the present invention is configured to perform matched filtering on the linear compensation output signal to obtain a matched filtering output signal, and the synchronization processing unit 230 described in the embodiment of the present invention is a subsequent algorithm processing unit of the coherent frequency hopping receiver. The method is used for completing de-spread demodulation and frequency offset compensation of the received signal and outputting an information sequence, namely a correct received signal and posterior information.
On the basis of the foregoing embodiment, the phase compensation unit is specifically configured to:
determining phase information corresponding to each frequency point in the frequency hopping pattern according to the phase frequency characteristic information of the IIR filter;
generating a frequency hopping pattern delay lookup table according to the phase information corresponding to each frequency point in the frequency hopping pattern and the phase compensation information of each frequency point in the frequency hopping pattern;
and performing nonlinear phase group delay compensation according to the frequency hopping pattern delay lookup table.
Specifically, the frequency point phase compensation information of the frequency hopping pattern described in the embodiment of the present invention may refer to 2 pi-TdThe phase corresponding to different frequency hopping frequencies is Td。
The frequency hopping pattern delay lookup table described in the embodiment of the present invention may be obtained by plotting the phase-frequency characteristics of the IIR in MAT L AB, fitting a curve with a polyfit function, and estimating the phase T corresponding to each frequency in the frequency hopping patterndSequentially delaying (2 pi-T) at the switching of the hopping pointsd) And time, so that the phase of each frequency point and the phase compensation information of each frequency point of the frequency hopping pattern are stored in a frequency hopping pattern delay lookup table.
According to the embodiment of the invention, the frequency hopping pattern delay is stored as the lookup table, so that the group delay compensation of nonlinear phases generated on different frequency points when the baseband signal passes through the anti-aliasing filter bank is realized, and the nonlinear compensation output signal can be used as the data input of the coherent algorithm receiver.
On the basis of the above embodiment, the anti-aliasing interference filtering unit is composed of a plurality of IIR filters in cascade connection.
Specifically, fig. 3 is a schematic structural diagram of an anti-aliasing interference filtering unit according to an embodiment of the present invention, as shown in fig. 3, the unit is composed of a plurality of IIR filters in cascade, h (z) represents an IIR filter, and x (z) represents an IIR filteri(n) represents a unit input signal, yiAnd (n) represents a certain section of unit output signal.
Fig. 4 is a flowchart of a strong interference rejection method according to an embodiment of the present invention, as shown in fig. 4, including:
step S1, acquiring an input signal, generating a frequency hopping pattern according to the input signal through the down-conversion unit, carrying out debounce on the frequency hopping pattern to obtain baseband data, and carrying out extraction processing on the baseband data to obtain extracted baseband data;
step S2, performing interference suppression on the extracted baseband data by the anti-aliasing interference filtering unit to obtain anti-interference information;
and step S3, performing nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
Specifically, the extracted baseband data described in the embodiment of the present invention has non-negligible aliasing interference or out-of-band interference.
The interference suppression described in the embodiments of the present invention specifically refers to multi-type out-of-band or aliasing interference suppression such as narrowband interference, single-tone interference, multi-tone interference, and the like.
More specifically, the step of performing nonlinear phase group delay compensation on the anti-interference signal by the phase compensation unit to obtain a nonlinear compensation output signal specifically includes;
determining phase compensation delay information of each frequency point of the frequency hopping pattern according to the frequency hopping pattern delay lookup table;
carrying out nonlinear phase group delay compensation on the anti-interference signal according to the phase compensation delay information of each frequency point of the frequency hopping pattern to obtain a nonlinear compensation output signal;
and the frequency hopping pattern delay lookup table is generated according to the phase information corresponding to each frequency point in the frequency hopping pattern and the preset delay time.
The nonlinear phase group delay compensation described in the embodiment of the invention specifically means that the phase information corresponding to each frequency point in a frequency hopping pattern is determined according to the phase frequency characteristic information of an IIR filter; and generating a frequency hopping pattern delay lookup table according to the phase information corresponding to each frequency point in the frequency hopping pattern and the phase compensation information of each frequency point in the frequency hopping pattern, and performing nonlinear phase group delay compensation according to the frequency hopping pattern delay lookup table.
According to the embodiment of the invention, the anti-interference processing is carried out on the extracted baseband data through the anti-aliasing interference filtering unit formed by cascading a plurality of IIR filters, and meanwhile, the group delay compensation is carried out on the nonlinear phases of different frequency points caused by the anti-aliasing interference filtering unit through the phase compensation unit, so that the strong interference of a frequency hopping system is effectively resisted.
In another embodiment of the present invention, the narrowband interference 40dB (5% bandwidth) and the full-band 30dB interference rejection requirement are taken as an example, first, FDATOO L tool is used to design the stop band rejectionThe simulation implementation type of the IIR filter is selected from a Chebyshev II type model (the Chebyshev II type filter can ensure that a pass band is flat, and the filter order is less under the condition of the same stop band rejection degree), the stop band rejection degree and the transition bandwidth can be flexibly changed along with system parameters, 5 pairs of zero-pole data results of the 10 th order IIR filter are subjected to 16-bit quantization processing in MAT L AB, the zero-pole data after the quantization processing are stored as coe files, which are imported into a software radio platform as a lookup table, and phases T corresponding to different frequency hopping frequencies are also introduced into a software radio platform as a lookup tabledAnd phase compensation delay 2 pi-TdA software radio platform is introduced as a look-up table as a compensation phase factor.
Secondly, a simplest second-order IIR unit is realized by a software radio platform to serve as a basic unit, the basic unit is instantiated for 5 times, and 5 units respectively call different zero pole results in a lookup table. And cascading the basic units to serve as data filtering units. And performing phase compensation on the output of the data filtering unit of the current frequency point through a phase compensation unit to serve as the input of the synchronization unit.
The method comprises the steps of independently realizing an anti-interference unit, introducing a coherent receiver algorithm unit to test anti-interference algorithm performance, comparing a test result with an FIR compiler core to replace an IIR anti-interference unit to perform anti-interference performance comparison, and testing the performance of different types of interference with the same index, under the condition of no interference, testing the error code performance of an FIR frequency hopping receiver, an IIR frequency hopping receiver and an IIR nonlinear compensation receiver, and referring to the simulation chart of the interference code error rate of the three frequency hopping receiving systems of the FIR frequency hopping receiver, the IIR frequency hopping receiver and the IIR compensation system described in the embodiment of the invention in FIG. 5, under the condition of no interference, testing the error code performance of the FIR coherent frequency hopping receiver, the IIR coherent frequency hopping receiver and the IIR nonlinear compensation coherent frequency hopping receiver, and referring to the simulation chart of the FIR frequency hopping receiver, the IIR and the IIR compensation system described in the embodiment of the invention under the full bandwidth interference code error rate of 30dB, as shown in FIG. 6, testing the performance of the FIR frequency hopping receiver, the IIR and IIR coherent receiver and IIR compensation system under the condition of 30dB interference, and the broadband interference, and the simulation chart of the FPGA (field programmable gate array) comprehensive test).
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 8, the electronic device may include: the processor810, the communication Interface 820, the memory 830 and the communication bus 840, wherein the processor810, the communication Interface 820 and the memory 830 complete communication with each other through the communication bus 840. the processor810 may call a logic instruction in the memory 830 to execute a method of obtaining an input signal, generating a frequency hopping pattern according to the input signal through the down-conversion unit, de-hopping the frequency hopping pattern to obtain baseband data, performing extraction processing on the baseband data to obtain extracted baseband data, performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain anti-interference information, and performing nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: acquiring an input signal, generating a frequency hopping pattern according to the input signal through the down-conversion unit, carrying out debounce on the frequency hopping pattern to obtain baseband data, and carrying out extraction processing on the baseband data to obtain extracted baseband data; performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain anti-interference information; and carrying out nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
Embodiments of the present invention provide a non-transitory computer-readable storage medium storing server instructions, where the server instructions cause a computer to execute the method provided in the foregoing embodiments, for example, the method includes: acquiring an input signal, generating a frequency hopping pattern according to the input signal through the down-conversion unit, carrying out debounce on the frequency hopping pattern to obtain baseband data, and carrying out extraction processing on the baseband data to obtain extracted baseband data; performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain anti-interference information; and carrying out nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An anti-strong interference device based on IIR filter, characterized by comprising: the device comprises a down-conversion unit, an anti-aliasing interference filtering unit and a phase compensation unit;
the down-conversion unit is used for de-hopping the frequency hopping pattern into baseband data, extracting the baseband data to obtain extracted baseband data, and sending the extracted baseband data to the anti-aliasing interference filtering unit;
the anti-aliasing interference filtering unit is used for performing interference suppression on the extracted baseband data to obtain an anti-interference signal and sending the anti-interference signal to the phase compensation unit;
the phase compensation unit is used for carrying out nonlinear phase group delay compensation on the anti-interference signal to obtain a nonlinear compensation output signal.
2. The IIR-filter-based strong interference rejection apparatus according to claim 1, further comprising: a matched filtering unit and a synchronous processing unit;
the matched filtering unit receives the nonlinear compensation output signal sent by the phase compensation unit, performs matched filtering to obtain a matched filtering output signal, and sends the matched filtering output signal to the synchronous processing unit;
and the synchronous processing unit is used for carrying out synchronous processing on the matched filtering output signal and solving an information sequence.
3. The IIR-filter-based strong interference rejection device according to claim 1, wherein the phase compensation unit is specifically configured to:
determining phase information corresponding to each frequency point in the frequency hopping pattern according to the phase frequency characteristic information of the IIR filter;
generating a frequency hopping pattern delay lookup table according to the phase information corresponding to each frequency point in the frequency hopping pattern and the phase compensation information of each frequency point in the frequency hopping pattern;
and performing nonlinear phase group delay compensation according to the frequency hopping pattern delay lookup table.
4. The IIR-filter-based anti-strong-interference apparatus according to claim 1, wherein the anti-aliasing interference filtering unit is composed of a plurality of IIR filter cascades.
5. An anti-strong interference method applying an anti-strong interference device based on an IIR filter as claimed in any one of claims 1 to 4, comprising:
acquiring an input signal, carrying out debounce on the input signal and a frequency hopping pattern prestored in a down-conversion unit through the down-conversion unit to obtain baseband data, and carrying out extraction processing on the baseband data to obtain extracted baseband data;
performing interference suppression on the extracted baseband data through the anti-aliasing interference filtering unit to obtain anti-interference information;
and carrying out nonlinear phase group delay compensation on the anti-interference signal through the phase compensation unit to obtain a nonlinear compensation output signal.
6. The method according to claim 5, wherein the step of performing nonlinear phase group delay compensation on the anti-interference signal by the phase compensation unit to obtain a nonlinear compensation output signal specifically includes:
determining phase compensation delay information of each frequency point of the frequency hopping pattern according to the frequency hopping pattern delay lookup table;
carrying out nonlinear phase group delay compensation on the anti-interference signal according to the phase compensation delay information of each frequency point of the frequency hopping pattern to obtain a nonlinear compensation output signal;
and the frequency hopping pattern delay lookup table is generated according to the phase information corresponding to each frequency point in the frequency hopping pattern and the preset delay time.
7. The method according to claim 5, wherein the step of performing interference suppression on the decimated baseband data by the anti-aliasing interference filtering unit specifically comprises:
and inputting the extracted baseband data into an anti-aliasing interference filtering unit, and inhibiting narrow-band interference, single-tone interference, multi-tone interference and aliasing interference.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method according to any of claims 5 to 7 when executing the program.
9. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, performs the steps of the anti-jamming method according to any one of claims 5 to 7.
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| CN112528582A (en) * | 2021-02-07 | 2021-03-19 | 北京理工大学 | Prototype filter generation method and device, channelization method and satellite-borne communication device |
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