CN114598353B - Interference suppression method and device based on perfect sub-band segmentation - Google Patents
Interference suppression method and device based on perfect sub-band segmentation Download PDFInfo
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Abstract
The invention provides an interference suppression method and device based on perfect sub-band segmentation, comprising the following steps: acquiring and quadrature digital up-conversion processing input baseband signals, and accordingly obtaining pre-divided intermediate frequency signals with preset center frequency; continuously performing half-folding sub-band segmentation on the pre-segmented intermediate frequency signal by using an orthogonal mirror image analysis filter to obtain a multi-sub-band segmentation signal; obtaining time domain sample values from the multi-path sub-band segmentation signals, and calculating the interference sub-band sequence numbers of all the interfered sub-bands according to the time domain sample values; zero shielding multi-sub-band segmentation signals are given according to the sequence numbers of the interference sub-bands, so that interference suppression sub-band signals are obtained; continuously synthesizing the interference suppression subband signals in a pairwise manner by using an orthogonal mirror image comprehensive filter until an interference suppression intermediate frequency signal is generated; the interference suppressed intermediate frequency signal is quadrature digital down-converted to generate an output baseband signal with the interference signal suppressed. The method solves the technical problems of high system resource overhead, slow response and difficult response to fast frequency hopping narrowband interference.
Description
Technical Field
The present invention relates to a method and an apparatus for interference suppression, and in particular, to a method and an apparatus for interference suppression based on perfect subband division in a spread spectrum communication system.
Background
Wireless communication electronic devices typically operate on a large number of electromagnetic interference signals, with a wide variety and pattern of interference, wireless or wired, naturally occurring or man-made, exotic or internally generated, man-made intentional or unintentional, pulsed or continuous wave, frequency-dependent or time-dependent, broadband or narrowband. These interference components, along with the useful signal entering the receiver chain, affect the performance of the device to varying degrees, slightly increase the error rate of the receiver, and severely saturate the receiver chain or damage the hardware circuitry.
For different interference signals, different interference suppression means are needed, some methods adopt means such as filtering and shielding on hardware to perform interference suppression, some methods perform interference suppression for time domain, frequency domain or space domain characteristics, and some methods perform interference suppression based on a signal modulation mode or a coding mode. The spread spectrum communication system adopts a spread spectrum modulation mode, expands the spectrum energy of a narrowband signal to a very wide frequency spectrum, and can resist narrowband interference to a certain extent, in particular to hostile or intentional interference. However, when the narrowband interference signal strength is large enough or exceeds the total energy of the broadband spectrum, the error rate of the system rises sharply or cannot work normally. The invention patent application number CN202010856405.0, namely a narrow-band interference resistant frequency domain notch method suitable for a spread spectrum system, comprises the following steps: 1) Dividing the mixed signal after matched filtering into M uniform sub-bands on a frequency domain, wherein the bandwidths of the sub-bands are the same; 2) Calculating the power of each sub-band for a plurality of times by adopting an FFT fast Fourier transform method, and calculating the average value of the power of each sub-band; sequencing the sub-bands in order of power average value from high to low, wherein the power average value of the ith sub-band in the sequence is
I is more than or equal to 1 and less than or equal to M; 3) By matlab, the mixed signals are simulated separatelyPerformance loss ζ due to signal distortion when cutting off the first k subbands in the sequence k To obtain xi k The relation with the number k of the cutting sub-bands is more than or equal to 1; 4) Obtaining +.>
Is a value of (2); wherein eta k For the ratio of the signal power of the mixed signal before the removal of k subbands to the signal power of the mixed signal after the removal of k subbands>
Signal power in an i-th subband in the sequence; 5) Calculating the signal-to-noise ratio gain lambda after the frequency domain notch wavefront and the signal-to-noise ratio change formula k I.e. lambda k Signal-to-noise ratio gain for the mixed signal after cutting k sub-bands; the signal-to-noise ratio change formula is as follows: />
6) The loop judgment is carried out from k=2, k is increased by 1 in the next loop period, and lambda is calculated in each loop period k With the previous value lambda k-1 Comparison, when lambda appears k >λ k-1 And cutting the first k-1 sub-bands in the sequence from the mixed signal, ending the cycle, and finishing the frequency domain notch method for resisting the narrowband interference. The traditional processing method adopts a narrow-band rejection filter to filter out the high-intensity interference, and searches for a shielding interference sub-band based on the maximum signal-to-noise ratio criterion so as to carry out notch suppression on the interference.
The interference suppression method based on the narrow-band-reject filter mainly has the following defects that firstly, complex nonlinear and cyclic operation is needed for calculating the change of the signal-to-noise ratio, the system resource cost is huge, the operation time is long, and the method is not suitable for a fixed-point digital signal processing system; secondly, the occurrence position of an interference sub-band needs to be calculated in advance based on matlab before each interference suppression, so that the real-time performance is poor; thirdly, when the number of the interference signals and the bandwidth are changed, matlab offline calculation is needed again, and the fast frequency hopping narrowband interference is difficult to deal with. The prior art has the technical problems of high system resource overhead, slow response and difficulty in coping with fast frequency hopping narrowband interference. In view of this situation, it is necessary to research an efficient interference suppression algorithm with an algorithm architecture independent of the number of interference and the interference bandwidth, aiming at the problem of narrowband strong interference in a spread spectrum communication system, and meanwhile, the frequency variation of an interference signal can be tracked rapidly, so that the operation resource cost is reduced, and the robustness and the anti-interference performance of the system are improved.
Disclosure of Invention
The invention aims to solve the technical problems of high system resource overhead, slow response and difficult handling of fast frequency hopping narrowband interference in the prior art.
The invention adopts the following technical scheme to solve the technical problems: the interference suppression method based on perfect sub-band segmentation comprises the following steps:
s1, acquiring and carrying out quadrature digital up-conversion processing on an input baseband signal, so as to obtain a pre-divided intermediate frequency signal with a preset center frequency;
s2, continuously carrying out half-folding sub-band segmentation on the pre-segmentation intermediate frequency signal by using an orthogonal mirror image analysis filter so as to obtain a multi-sub-band segmentation signal, wherein the step S2 comprises the following steps:
s21, continuously carrying out half-folded sub-band segmentation on the pre-segmented intermediate frequency signal by utilizing the orthogonal mirror image analysis filter;
s22, when the number of the sub-bands is
The half-band division is ended at the moment, and the continuous division level is ceil (log) 2 (FS a /BW i ))；
S23, forming the multi-path sub-band division signal by all the sub-bands, wherein ceil () is an upward rounding function, FS a For the complex sampling rate of the input baseband signal a, BW i The minimum bandwidth of the interference signal to be processed by the system is set;
s3, obtaining a time domain sample value from the multi-sub-band segmentation signal, and calculating an interference sub-band sequence number of each interfered sub-band according to the time domain sample value;
s4, zero shielding the multi-path sub-band division signals according to the sequence numbers of the interference sub-bands so as to obtain interference suppression sub-band signals;
s5, continuously synthesizing the interference suppression subband signals in a pairwise manner by using an orthogonal mirror image comprehensive filter until an interference suppression intermediate frequency signal is generated;
s6, performing quadrature digital down-conversion on the interference suppression intermediate frequency signal so as to generate an output baseband signal with the interference signal suppressed.
The invention provides a real-time interference suppression algorithm with an algorithm architecture independent of the interference quantity and the interference bandwidth, which adopts an orthogonal mirror image analysis filter to continuously split half sub-bands of pre-split intermediate frequency signals, and utilizes the inverse process of the continuous half-band splitting algorithm to gradually synthesize the interference suppression sub-band signals, so that strong narrow-band interference signals in broadband spread spectrum signals can be suppressed in real time, and meanwhile, complex interference signals with frequency hopping along with time can be rapidly tracked and suppressed, the algorithm architecture and complexity are unchanged when the quantity of the interference signals is increased or the bandwidth is changed, and meanwhile, the frequency change of the interference signals can be rapidly tracked, the operation resource cost is reduced, and the robustness and anti-interference performance of a system are improved.
In a more specific technical solution, the step S1 includes:
s11, low-pass half-band filtering the input baseband signal, and carrying out integral multiple delay on the imaginary part of the input baseband signal, wherein the number of stages of the integral multiple delay is half of the number of taps of the low-pass half-band filter;
s12, respectively carrying out symbol transformation on the results after the low-pass half-band filtering operation and the integer multiple delay operation, and inverting data once every one symbol, thereby obtaining two paths of symbol transformation results;
s13, interleaving and outputting the two paths of symbol conversion results in time to form the pre-divided intermediate frequency signal.
The invention comprehensively adopts high-efficiency methods such as two-phase synthesis, half-band filtering and the like, changes the complex baseband signal into the real intermediate frequency signal, and greatly reduces the expenditure of operation resources.
In a more specific technical solution, the step S3 includes:
s31, respectively performing modular squaring operation on each sub-band signal of the multi-path sub-band division signal to obtain a modular squaring result of each sub-band;
s32, integrating and accumulating the modular square result of each sub-band, thereby obtaining an integrated and accumulated result of each sub-band;
s33, judging the sub-band power of the integrated and accumulated result of each sub-band;
s34, if the sub-band power exceeds ten times of the minimum sub-band power, judging that the current sub-band is an interference sub-band;
s35, outputting the interference sub-band sequence number.
The invention only needs to adopt simple multiply-add and comparison operation when calculating the sequence number of the interference sub-band, has little resource expense and short calculation time, and is particularly suitable for a fixed-point digital signal processing system.
In a more specific technical solution, the step S5 includes:
s51, synthesizing the interference suppression subband signals step by step in pairs by utilizing the inverse process of a continuous half-folding subband segmentation algorithm;
s52, halving the number of the sub-bands after each stage of synthesis, and doubling the bandwidth of the sub-bands until the interference suppression intermediate frequency signal is generated.
The invention utilizes the inverse process of the continuous half-folding sub-band segmentation algorithm to gradually synthesize the interference suppression sub-band signals in pairs, realizes the real-time conversion of bandwidth, does not need to reload filter coefficients when the bandwidth of the interference signal changes, does not need to change the filter architecture when the granularity of the bandwidth change is larger, and shortens the response time.
In a more specific technical solution, the step S6 includes:
s61, two-phase decomposing the interference suppression intermediate frequency signal, so as to generate two paths of time interleaving data with half data rate;
s62, inverting one sample symbol at each interval of the time interleaving data of the first path to obtain inverted time interleaving data, performing low-pass half-band filtering processing on the inverted time interleaving data to obtain filtering interleaving data, adjusting the processing gain of quadrature digital down-conversion to be 1, and generating a real component of an output baseband signal with suppressed interference signals according to the filtering interleaving data and the processing gain;
s63, inverting one sample symbol of the time interleaving data of the second path every interval, and then carrying out integral multiple delay, wherein the number of the integral multiple delay is half of the number of taps of the low-pass half-band filter, so as to obtain inverted delay data, adjusting the processing gain of the orthogonal digital down-conversion to be 1, and generating the imaginary component of the output baseband signal of which the interference signal is suppressed.
The invention decomposes the interference suppression intermediate frequency signal by two phases, performs inverse operation, low-pass half-band filtering processing and integer multiple delay, adjusts gain to generate an output baseband signal with suppressed interference signal, improves the response speed of the system to frequency change, does not need to calculate the position of an interference sub-band off line again, and is suitable for suppressing the fast frequency hopping narrow-band interference.
In a more specific technical solution, an interference suppression device based on perfect subband division includes:
the quadrature digital up-conversion module is used for obtaining and carrying out quadrature digital up-conversion processing on an input baseband signal so as to obtain a pre-divided intermediate frequency signal with a preset center frequency;
the perfect sub-band segmentation module is used for continuously carrying out half-folding sub-band segmentation on the pre-segmentation intermediate frequency signal by utilizing an orthogonal mirror image analysis filter so as to obtain a multi-sub-band segmentation signal, the perfect sub-band segmentation module is connected with the orthogonal digital up-conversion module, and the perfect sub-band segmentation module comprises: 2 k-1 A kth level perfect subband splitting unit, where k is [1, N]Integer between, N is the number of stages of perfect sub-band division, the input of the perfect sub-band division unit of the 1 st stage is the pre-divided intermediate frequency signal, the output result of the perfect sub-band division unit of the kth (k not equal to N) stage is sent to 2 k A (k+1) -th-stage perfect sub-band dividing unit, wherein the output result of the Nth-stage perfect sub-band dividing unit is a multi-path sub-band dividing signal;
the interference sub-band judgment module is used for acquiring time domain sample values from the multipath sub-band division signals so as to calculate the interference sub-band sequence numbers of all interfered sub-bands, and the interference sub-band judgment module is connected with the perfect sub-band division module;
the interference sub-band shielding module is used for zero shielding the multipath sub-band division signals according to the interference sub-band sequence numbers so as to obtain interference suppression sub-band signals, and the interference sub-band shielding module is connected with the interference sub-band judgment module and the perfect sub-band division module;
the perfect sub-band synthesis module is used for continuously synthesizing the interference suppression sub-band signals in a pairwise manner by utilizing an orthogonal mirror image comprehensive filter until an interference suppression intermediate frequency signal is generated, and the perfect sub-band synthesis module is connected with the interference sub-band shielding module;
and the quadrature digital down-conversion module is used for performing quadrature digital down-conversion on the interference suppression intermediate frequency signal so as to generate an output baseband signal with the interference signal suppressed, and is connected with the perfect sub-band synthesis module.
The invention provides an interference suppression device based on perfect sub-band segmentation, which adopts a perfect sub-band segmentation module to continuously split half sub-bands of pre-segmented intermediate frequency signals by an orthogonal mirror image analysis filter, and utilizes the inverse process of a continuous half sub-band segmentation algorithm to gradually synthesize interference suppression sub-band signals, so that strong narrow-band interference signals in broadband spread spectrum signals can be suppressed in real time, complex interference signals with frequency hopping along with time can be rapidly tracked and suppressed, the architecture and complexity of the algorithm are unchanged when the number of the interference signals is increased or the bandwidth is changed, the frequency change of the interference signals can be rapidly tracked, the operation resource cost is reduced, and the robustness and anti-interference performance of a system are improved.
In a more specific technical solution, the quadrature digital up-conversion module includes:
an up-conversion half-band filtering unit for low-pass half-band filtering the input baseband signal;
an up-conversion delay unit for performing an integer multiple delay on an imaginary part of the input baseband signal, wherein the number of stages of the integer multiple delay is half of the number of taps of the low-pass half-band filter;
the up-conversion first symbol conversion unit is used for performing symbol conversion on the output result of the half-band filtering unit, the symbol conversion output result is sent to the data interleaving unit, and the up-conversion first symbol unit is connected with the up-conversion half-band filtering unit;
an up-conversion second symbol conversion unit for performing symbol conversion on the output result of the up-conversion delay unit, wherein the up-conversion second symbol conversion unit is connected with the up-conversion delay unit;
and the up-conversion data interleaving unit is used for interleaving and outputting two paths of symbol conversion results of the up-conversion first symbol conversion unit and the up-conversion second symbol conversion unit in time to obtain a pre-divided intermediate frequency signal, and the up-conversion data interleaving unit is connected with the up-conversion first symbol conversion unit and the up-conversion second symbol conversion unit.
In a more specific technical solution, the interference subband determining module includes:
a module square unit for performing module square operation on each sub-band signal of the multi-path sub-band division signal;
the integral accumulation unit is used for carrying out integral accumulation on the result of the modular squaring so as to obtain integral accumulation results of all sub-bands, and is connected with the modular squaring unit;
and the threshold searching unit is used for judging the sub-band power of the integral accumulation result of each sub-band, judging the current sub-band as an interference sub-band if the sub-band power exceeds ten times of the minimum sub-band power, and outputting the serial number of the interference sub-band according to the current sub-band.
In a more specific embodiment, the perfect subband synthesis module comprises 2 k-1 A kth stage perfect sub-band synthesis unit, the input of which is an interference suppression sub-band signal, and the output of which is given to 2 k-2 A (k-1) th level perfect sub-band synthesis unit, an output junction of the 1 st level perfect sub-band synthesis unitThe result is an interference suppressed intermediate frequency signal.
In a more specific aspect, the quadrature digital down-conversion module includes:
the down-conversion two-phase decomposition unit carries out two-phase decomposition on the interference suppression intermediate frequency signal, so as to generate two paths of time interleaving data with halved data rate;
the down-conversion first symbol conversion unit inverts the first path of time interleaving data once every one symbol to obtain inverted time interleaving data, and the down-conversion first symbol conversion unit is connected with the down-conversion two-phase decomposition unit;
a down-conversion second symbol conversion unit, which inverts the second path of time interleaving data once every one symbol to obtain the inverted time interleaving data, and is connected with the down-conversion two-phase decomposition unit;
the down-conversion half-band filtering unit is used for performing low-pass half-band filtering on the inverse time interleaving data of the down-conversion first symbol conversion unit so as to obtain filtering interleaving data, and the down-conversion half-band filtering unit is connected with the down-conversion first symbol conversion unit;
the down-conversion delay unit is used for carrying out integral multiple delay on the output result of the down-conversion second symbol conversion unit, the number of the integral multiple delay is half of the number of taps of the low-pass half-band filter, and accordingly inverse delay data are obtained, and the down-conversion delay unit is connected with the down-conversion second symbol conversion unit;
and the down-conversion gain adjustment unit is used for performing gain adjustment on the filtering interleaving data and the inverse delay data to respectively generate a real component and an imaginary component of an output baseband signal with the interference signal suppressed, and is connected with the down-conversion half-band filtering unit and the down-conversion delay unit.
Compared with the prior art, the invention has the following advantages: the invention provides a real-time and efficient interference suppression algorithm with an algorithm architecture independent of the interference quantity and the interference bandwidth, which adopts an orthogonal mirror image analysis filter to continuously split half sub-bands of pre-split intermediate frequency signals, and utilizes the inverse process of the continuous half sub-band splitting algorithm to gradually synthesize the interference suppression sub-band signals in pairs, so that strong narrow-band interference signals in broadband spread spectrum signals can be suppressed in real time, and simultaneously, complex interference signals with frequency hopping along with time can be rapidly tracked and suppressed, the architecture and complexity of the algorithm are unchanged when the quantity of the interference signals is increased or the bandwidth is changed, the frequency change of the interference signals can be rapidly tracked, and simultaneously, a large number of two-phase decomposition and two-phase synthesis algorithms are adopted, thereby greatly reducing the resource expenditure of a system and improving the robustness and anti-interference performance of the system. The invention only needs to adopt simple multiply-add and comparison operation when calculating the sequence number of the interference sub-band, has little resource expense and short calculation time, and is particularly suitable for a fixed-point digital signal processing system. The invention realizes the real-time conversion of the bandwidth, does not need to calculate the position of the interference sub-band off line again when the frequency and the bandwidth of the interference signal are changed, shortens the response time and is suitable for inhibiting the fast frequency hopping narrow-band interference. The robustness and anti-interference performance of the system are improved, the technical problems that the system resource cost is huge, the response is slow and the rapid frequency hopping narrow-band interference is difficult to deal with in the prior art are solved, and the method is particularly suitable for a fixed-point digital signal processing system.
Drawings
Fig. 1 is a schematic flow chart of an interference suppression method based on perfect subband segmentation according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an interference suppression device based on perfect subband division according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an orthogonal digital up-conversion module in an interference suppression device based on perfect subband division according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a perfect subband splitting module in an interference suppression device based on perfect subband splitting according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a perfect subband splitting unit in a perfect subband splitting module in an interference suppression device based on perfect subband splitting according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an interference subband judgment module in an interference suppression device based on perfect subband division according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a perfect subband synthesis module in an interference suppression device based on perfect subband division according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a perfect subband synthesis unit in a perfect subband synthesis module in an interference suppression device based on perfect subband segmentation according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an orthogonal digital down-conversion module in an interference suppression device based on perfect subband division according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, fig. 1 is a flow chart of an interference suppression method based on perfect subband division according to an embodiment of the present invention, where the method includes:
s101: the input baseband signal a is subjected to quadrature digital up-conversion, and a pre-divided intermediate frequency signal b with a central frequency of 1/4 sampling rate is output.
Specifically, the step S101 may include: a: the real part of the input baseband signal a is subjected to low-pass half-band filtering, the imaginary part of the input baseband signal a is subjected to integral multiple delay, and the number of stages of the integral multiple delay is half of the number of taps of the low-pass half-band filter; b: respectively carrying out symbol transformation on the low-pass half-band filtering and integer multiple delay results, wherein each interval is provided with one sample symbol, and the data is inverted once; c: the two paths of symbol conversion results are output in an interleaving mode in time, and the pre-divided intermediate frequency signal b is obtained.
In the embodiment of the invention, the bandwidth of the input baseband signal a is 40MHz, and the complex sampling rate is 48MSPS; the tap number of the low-pass half-band filter is 64, the passband bandwidth is 20MHz, the real sampling rate is 96MHz, and the number of stages of integer multiple delay is 64/2=32; multiplying the data samples by (-1) n The symbol transformation can be realized, wherein n is a time sequence value; and (3) alternately outputting the two paths of symbol conversion results in a ping-pong manner in a time domain, and realizing interleaving output with the rate of 48 x 2 = 96MSPS to obtain a pre-divided intermediate frequency signal b with the intermediate frequency of 24MHz and the bandwidth of 40 MHz.
S102: and continuously carrying out half-folded sub-band segmentation on the pre-segmented intermediate frequency signal b by using a quadrature mirror image analysis filter, and outputting a multi-sub-band segmentation signal c.
Specifically, the step S102 may include: a: dividing the pre-divided intermediate frequency signal b into two sub-band signals by using a quadrature mirror analysis filter; b: dividing the two sub-band signals into four sub-band signals by using orthogonal mirror image analysis filters respectively; c: dividing the four sub-band signals into eight sub-band signals by using orthogonal mirror image analysis filters respectively; d: continuing to divide until the number of sub-bands after the continuous half-band division is
At this time, the continuous division level is ceil (log) 2 (FS a /BW i ) Finally all subbands constitute a multi-subband partition signal c, where ceil () is a round-up function, FS a For the complex sampling rate of the input baseband signal a, BW i Is the minimum bandwidth of the interference signal to be processed by the system.
In the embodiment of the invention, the number of taps of the quadrature mirror image analysis filter is 64, and the relative bandwidth is 0.45; BW (BW) i ＝1MHz；FS a =48 MHz, split series 6; the number of sub-bands after the first stage segmentation is 2; the 2 sub-bands are respectively subjected to second-stage segmentation, and the number of the sub-bands after the second-stage segmentation is 4; the 4 sub-bands are respectively subjected to third-level segmentation, and the number of the sub-bands after the third-level segmentation is 8; and so on, the number of the sub-bands after the sixth level segmentation is 64, and the 64 sub-band signals are multi-path sub-band segmentationSignal c.
S103: and calculating the interference sub-band sequence number d of each interfered sub-band based on the time domain sample value of the multi-sub-band division signal c.
Specifically, the step S103 may include: a: respectively carrying out modular squaring operation on each sub-band signal of the multi-path sub-band division signal c; b: integrating and accumulating the result of modular squaring of each sub-band; c: and judging the power of the integrated accumulation result of each sub-band, judging the sub-band exceeding ten times of the minimum sub-band power as an interference sub-band, and outputting an interference sub-band sequence number d.
In the embodiment of the invention, the modular squaring operation formula is as follows
Wherein I is k (n) and Q k (n) sample values at time n for the real and imaginary parts of the kth subband split signal, respectively; outputting an accumulation result once every 64 continuous points of the modular square operation result to obtain the instantaneous signal power of each sub-band division signal; those subbands that exceed ten times the minimum subband instantaneous power are found, marked as interfering subbands, and the interfering subband sequence number d is output.
S104: and carrying out zero-masking operation on the multipath sub-band division signal c based on the interference sub-band sequence number d, and outputting an interference suppression sub-band signal e.
In the embodiment of the invention, based on the interference sub-band sequence number d, the real part and the imaginary part data of the corresponding sub-band division signal are set to 0, and the other sub-band division signal data are unchanged, so as to obtain the interference suppression sub-band signal e.
S105: and continuously synthesizing the interference suppression subband signals e in a pairwise manner by using a quadrature mirror image synthesis filter until an interference suppression intermediate frequency signal f is generated.
Specifically, the step S105 may include: and synthesizing the interference suppression subband signals e step by step in pairs according to the inverse process of the continuous half-folding subband segmentation algorithm, halving the number of subbands after each stage of synthesis, and doubling the subband bandwidth until an interference suppression intermediate frequency signal f is generated.
In the embodiment of the invention, 64 paths of interference suppression intermediate frequency signals f are synthesized into 32 subband signals through an orthogonal mirror image synthesis filter, then the 32 subband signals are synthesized into 16 subband signals, then the 16 subband signals are synthesized into 8 subband signals, and so on, and finally one path of interference suppression intermediate frequency signals f are synthesized. The quadrature mirror synthesis filter has a tap number of 64 and a relative bandwidth of 0.45.
S106: the interference suppressed intermediate frequency signal f is quadrature digital down-converted to generate an interference signal suppressed output baseband signal g.
Specifically, the step S106 may include: a: performing two-phase decomposition on the interference suppression intermediate frequency signal f to generate two paths of time interleaving data with halved data rate; b: inverting the first path of time interleaving data once every one sample symbol; then carrying out low-pass half-band filtering treatment; finally, gain adjustment is carried out to enable the processing gain of the orthogonal digital down-conversion to be 1, and the real component of the output baseband signal g with the interference signal suppressed is generated; c: inverting the second path of time interleaving data once every one sample symbol; then carrying out integral multiple delay, wherein the number of stages of the integral multiple delay is half of the number of taps of the low-pass half-band filter; finally, gain adjustment is performed to set the processing gain of the quadrature digital down-conversion to 1, thereby generating an imaginary component of the output baseband signal g in which the interference signal is suppressed.
In the embodiment of the invention, after the interference suppression intermediate frequency signal f is subjected to two-phase decomposition, two paths of time interleaving data with the data rate of 48MSPS are generated; the tap number of the low-pass half-band filter on the first path of time interleaving data path is 64, the passband bandwidth is 20MHz, and the sampling rate is 96MHz; the number of stages of integer multiple delays on the second time-interleaved data path is 64/2=32; the gain adjustment of the two paths of data is realized by two fixed-point multipliers, and an output baseband signal g with a complex data rate of 48MSPS is obtained after the gain adjustment.
The embodiment shown in the figure 1 of the invention realizes narrow-band interference suppression based on a perfect sub-band segmentation and synthesis scheme, is particularly suitable for complex application scenes of the quantity, bandwidth and frequency point change along with time of narrow-band interference signals compared with the traditional narrow-band notch method, has small processing resource cost and strong system instantaneity and robustness.
As shown in fig. 2, fig. 2 is a schematic structural diagram of an interference suppression device based on perfect subband division according to an embodiment of the present invention, where the device includes: a quadrature digital up-conversion module 201, a perfect subband splitting module 202, an interfering subband decision module 203, an interfering subband masking module 204, a perfect subband synthesis module 205 and a quadrature digital down-conversion module 206. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the quadrature digital up-conversion module 201 outputs the pre-divided intermediate frequency signal b to the perfect sub-band division module 202;
a perfect subband splitting module 202 outputting a multi-subband splitting signal c to an interfering subband decision module 203 and an interfering subband masking module 204;
an interference sub-band decision module 203 outputs an interference sub-band sequence number d to an interference sub-band shielding module 204;
an interference subband masking module 204 that outputs an interference suppressed subband signal e to a perfect subband synthesis module 205;
the perfect sub-band synthesis module 205 outputs the interference suppression intermediate frequency signal f to the quadrature digital down-conversion module 206;
the quadrature digital down-conversion module 206 generates an output baseband signal g with suppressed interference signals.
As shown in fig. 3, the quadrature digital up-conversion module 201 includes: a half-band filtering unit 201a, a delay unit 201b, a first symbol transforming unit 201c, a second symbol transforming unit 201d, and a data interleaving unit 201e, wherein,
a half-band filtering unit 201a that half-band filters the real part of the input baseband signal a, and outputs the half-band filtered result to a first symbol conversion unit 201c;
delay section 201b delays the imaginary part of input baseband signal a by an integer multiple, and outputs the result of the integer multiple delay to second symbol conversion section 201d;
a first symbol transforming unit 201c, configured to perform symbol transformation on the output result of the half-band filtering unit 201a, where the symbol transformed output result is sent to the data interleaving unit 201e;
a second symbol conversion unit 201d, configured to perform symbol conversion on the output result of the delay unit 201b, where the symbol conversion output result is sent to the data interleaving unit 201e;
the data interleaving unit 201e interleaves and outputs the output results of the first symbol conversion unit 201c and the second symbol conversion unit 201d in time, and obtains the pre-divided intermediate frequency signal b.
As shown in fig. 4 to 5, the perfect sub-band division module includes 2 k-1 A kth level perfect subband splitting unit, where k is [1,6]The integer between them, the input of the 1 st stage perfect sub-band dividing unit is pre-divided intermediate frequency signal b, the output result of the k (k is not equal to 6) stage perfect sub-band dividing unit is sent to 2 k And (k+1) th-stage perfect sub-band dividing units, wherein the output result of the 6 th-stage perfect sub-band dividing units is a multipath sub-band dividing signal c. Fig. 5 is a schematic structural diagram of a perfect subband splitting unit in a perfect subband splitting module 202 in an interference suppression device based on perfect subband splitting according to an embodiment of the present invention.
As shown in fig. 6, the interference subband determining module 203 includes a modulo square unit 203a, an integral accumulation unit 203b and a threshold search unit 203c connected in sequence, where,
a modulo square unit 203a performs a modulo square operation on each subband signal of the multipath subband division signal c, and outputs the result to an integral accumulation unit 203b;
an integral accumulation unit 203b that integrates and accumulates the result of the modulo square, and outputs the result to a threshold search unit 203c;
the threshold search unit 203c performs power discrimination on the integrated accumulation result of each subband, and outputs an interference subband sequence number d.
As shown in fig. 7 and 8, the perfect subband synthesis module 205 comprises 2 k-1 A kth level perfect subband synthesis unit, where k is [1,6]The integer between them, the input of the 6 th level perfect sub-band synthesis unit is the interference suppression sub-band signal e, the output result of the k (k not equal to 1) level perfect sub-band synthesis unit is sent to 2 k-2 And (4) a (k-1) th-stage perfect sub-band synthesis unit, wherein the output result of the 1 st-stage perfect sub-band synthesis unit is an interference suppression intermediate frequency signal f.
As shown in fig. 9, the quadrature digital down-conversion module 206 includes a two-phase decomposition unit 206a, a first symbol conversion unit 206b, a second symbol conversion unit 206c, a half-band filtering unit 206d, a delay unit 206e, and a gain adjustment unit 206f, wherein,
a two-phase decomposition unit 206a performing two-phase decomposition on the interference suppressed intermediate frequency signal f to generate two paths of time interleaved data, which are respectively supplied to the first symbol conversion unit 206b and the second symbol conversion unit 206c;
a first symbol transforming unit 206b inverts the first path of time interleaved data by one sample symbol every interval, and sends the symbol transformed result to a half-band filtering unit 206d;
a second symbol conversion unit 206c, which inverts the second path of time-interleaved data once every one sample symbol interval, and sends the symbol conversion result to a delay unit 206e;
half-band filtering section 206d performs low-pass half-band filtering on the output result of first symbol conversion section 206b, and sends the filtered result to gain adjustment section 206f;
delay section 206e delays the output result of second symbol conversion section 206c by an integer multiple, and sends the delayed result to gain adjustment section 206f;
In summary, the invention provides a real-time and efficient interference suppression algorithm with an algorithm architecture independent of the number of interference and the bandwidth of interference, which continuously performs halving sub-band division on pre-divided intermediate frequency signals by adopting an orthogonal mirror image analysis filter, and synthesizes interference suppression sub-band signals step by utilizing the inverse process of the continuous halving sub-band division algorithm, so that strong narrow-band interference signals in broadband spread spectrum signals can be suppressed in real time, and meanwhile, complex interference signals with frequency hopping along with time can be rapidly tracked and suppressed, the architecture and complexity of the algorithm are unchanged when the number of the interference signals is increased or the bandwidth is changed, the frequency change of the interference signals can be rapidly tracked, and simultaneously, the resource cost of a system is greatly reduced by adopting a two-phase decomposition and two-phase synthesis algorithm, and the robustness and anti-interference performance of the system are improved. The invention only needs to adopt simple multiply-add and comparison operation when calculating the sequence number of the interference sub-band, has little resource expense and short calculation time, and is particularly suitable for a fixed-point digital signal processing system. The invention realizes the real-time conversion of the bandwidth, does not need to calculate the position of the interference sub-band off line again when the frequency and the bandwidth of the interference signal are changed, shortens the response time and is suitable for inhibiting the fast frequency hopping narrow-band interference. The robustness and anti-interference performance of the system are improved, the technical problems that the system resource cost is huge, the response is slow and the rapid frequency hopping narrow-band interference is difficult to deal with in the prior art are solved, and the method is particularly suitable for a fixed-point digital signal processing system.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An interference suppression method based on perfect subband segmentation, the method comprising:
s1, acquiring and carrying out quadrature digital up-conversion processing on an input baseband signal, so as to obtain a pre-divided intermediate frequency signal with a preset center frequency;
s2, continuously carrying out half-folding sub-band segmentation on the pre-segmentation intermediate frequency signal by using an orthogonal mirror image analysis filter so as to obtain a multi-sub-band segmentation signal, wherein the step S2 comprises the following steps:
s21, continuously carrying out half-folded sub-band segmentation on the pre-segmented intermediate frequency signal by utilizing the orthogonal mirror image analysis filter;
s22, when the number of the sub-bands is
The half-band division is ended at the moment, and the continuous division level is ceil (log) 2 (FS a /BW i ))；
S23, forming the multi-path sub-band division signal by all the sub-bands, wherein ceil () is an upward rounding function, FS a For the complex sampling rate of the input baseband signal a, BW i The minimum bandwidth of the interference signal to be processed by the system is set;
s3, obtaining a time domain sample value from the multi-sub-band segmentation signal, and calculating an interference sub-band sequence number of each interfered sub-band according to the time domain sample value;
s4, zero shielding the multi-path sub-band division signals according to the sequence numbers of the interference sub-bands so as to obtain interference suppression sub-band signals;
s5, continuously synthesizing the interference suppression subband signals in a pairwise manner by using an orthogonal mirror image comprehensive filter until an interference suppression intermediate frequency signal is generated;
s6, performing quadrature digital down-conversion on the interference suppression intermediate frequency signal so as to generate an output baseband signal with the interference signal suppressed.
2. The interference suppression method based on perfect subband division according to claim 1, wherein the step S1 comprises:
s11, low-pass half-band filtering the input baseband signal, and carrying out integral multiple delay on the imaginary part of the input baseband signal, wherein the number of stages of the integral multiple delay is half of the number of taps of the low-pass half-band filter;
s12, respectively carrying out symbol transformation on the results after the low-pass half-band filtering operation and the integer multiple delay operation, and inverting data once every one symbol, thereby obtaining two paths of symbol transformation results;
s13, interleaving and outputting the two paths of symbol conversion results in time to form the pre-divided intermediate frequency signal.
3. The interference suppression method based on perfect subband division according to claim 1, wherein the step S3 comprises:
s31, respectively performing modular squaring operation on each sub-band signal of the multi-path sub-band division signal to obtain a modular squaring result of each sub-band;
s32, integrating and accumulating the modular square result of each sub-band, thereby obtaining an integrated and accumulated result of each sub-band;
s33, judging the sub-band power of the integrated and accumulated result of each sub-band;
s34, if the sub-band power exceeds ten times of the minimum sub-band power, judging that the current sub-band is an interference sub-band;
s35, outputting the interference sub-band sequence number.
4. The interference suppression method based on perfect subband division according to claim 1, wherein the step S5 comprises:
s51, synthesizing the interference suppression subband signals step by step in pairs by utilizing the inverse process of a continuous half-folding subband segmentation algorithm;
s52, halving the number of the sub-bands after each stage of synthesis, and doubling the bandwidth of the sub-bands until the interference suppression intermediate frequency signal is generated.
5. The interference suppression method based on perfect subband division according to claim 1, wherein the step S6 comprises:
s61, two-phase decomposing the interference suppression intermediate frequency signal, so as to generate two paths of time interleaving data with half data rate;
s62, inverting one sample symbol at each interval of the time interleaving data of the first path to obtain inverted time interleaving data, performing low-pass half-band filtering processing on the inverted time interleaving data to obtain filtering interleaving data, adjusting the processing gain of quadrature digital down-conversion to be 1, and generating a real component of an output baseband signal with suppressed interference signals according to the filtering interleaving data and the processing gain;
s63, inverting one sample symbol of the time interleaving data of the second path every interval, and then carrying out integral multiple delay, wherein the number of the integral multiple delay is half of the number of taps of the low-pass half-band filter, so as to obtain inverted delay data, adjusting the processing gain of the orthogonal digital down-conversion to be 1, and generating the imaginary component of the output baseband signal of which the interference signal is suppressed.
6. An interference suppression device based on perfect subband splitting, the device comprising:
the quadrature digital up-conversion module is used for acquiring and carrying out quadrature digital up-conversion processing on an input baseband signal so as to obtain a pre-divided intermediate frequency signal with a preset center frequency;
the perfect sub-band segmentation module is used for continuously carrying out half-folding sub-band segmentation on the pre-segmentation intermediate frequency signal by utilizing an orthogonal mirror image analysis filter so as to obtain a multi-sub-band segmentation signal, the perfect sub-band segmentation module is connected with the orthogonal digital up-conversion module, and the perfect sub-band segmentation module comprises: 2 k-1 A kth level perfect subband splitting unit, where k is [1, N]Integer between, N is the number of stages of perfect sub-band division, the input of the perfect sub-band division unit of the 1 st stage is the pre-divided intermediate frequency signal, the output result of the perfect sub-band division unit of the kth (k not equal to N) stage is sent to 2 k A (k+1) -th-stage perfect sub-band dividing unit, wherein the output result of the Nth-stage perfect sub-band dividing unit is a multi-path sub-band dividing signal;
the interference sub-band judgment module is used for acquiring time domain sample values from the multipath sub-band division signals so as to calculate the interference sub-band sequence numbers of all interfered sub-bands, and the interference sub-band judgment module is connected with the perfect sub-band division module;
the interference sub-band shielding module is used for zero shielding the multipath sub-band division signals according to the interference sub-band sequence numbers so as to obtain interference suppression sub-band signals, and the interference sub-band shielding module is connected with the interference sub-band judgment module and the perfect sub-band division module;
the perfect sub-band synthesis module is used for continuously synthesizing the interference suppression sub-band signals in a pairwise manner by utilizing an orthogonal mirror image comprehensive filter until an interference suppression intermediate frequency signal is generated, and the perfect sub-band synthesis module is connected with the interference sub-band shielding module;
and the quadrature digital down-conversion module is used for performing quadrature digital down-conversion on the interference suppression intermediate frequency signal so as to generate an output baseband signal with the interference signal suppressed, and is connected with the perfect sub-band synthesis module.
7. The interference suppression device based on perfect subband splitting of claim 6, wherein the quadrature digital up-conversion module comprises:
an up-conversion half-band filtering unit for low-pass half-band filtering the input baseband signal;
an up-conversion delay unit for performing an integer multiple delay on an imaginary part of the input baseband signal, wherein the number of stages of the integer multiple delay is half of the number of taps of the low-pass half-band filter;
the up-conversion first symbol conversion unit is used for performing symbol conversion on the output result of the half-band filtering unit, the symbol conversion output result is sent to the data interleaving unit, and the up-conversion first symbol unit is connected with the up-conversion half-band filtering unit;
an up-conversion second symbol conversion unit for performing symbol conversion on the output result of the up-conversion delay unit, wherein the up-conversion second symbol conversion unit is connected with the up-conversion delay unit;
and the up-conversion data interleaving unit is used for interleaving and outputting two paths of symbol conversion results of the up-conversion first symbol conversion unit and the up-conversion second symbol conversion unit in time to obtain a pre-divided intermediate frequency signal, and the up-conversion data interleaving unit is connected with the up-conversion first symbol conversion unit and the up-conversion second symbol conversion unit.
8. The interference suppression device based on perfect subband splitting of claim 6, wherein the interference subband decision module comprises:
a module square unit for performing module square operation on each sub-band signal of the multi-path sub-band division signal;
the integral accumulation unit is used for carrying out integral accumulation on the result of the modular squaring so as to obtain integral accumulation results of all sub-bands, and is connected with the modular squaring unit;
and the threshold searching unit is used for judging the sub-band power of the integral accumulation result of each sub-band, judging the current sub-band as an interference sub-band if the sub-band power exceeds ten times of the minimum sub-band power, and outputting the serial number of the interference sub-band according to the current sub-band.
9. The interference suppression device based on perfect subband splitting as claimed in claim 6, wherein the perfect subband synthesis module comprises 2 k-1 A kth stage perfect sub-band synthesis unit, the input of which is an interference suppression sub-band signal, and the output of which is given to 2 k-2 And (4) a (k-1) th-stage perfect sub-band synthesis unit, wherein the output result of the 1 st-stage perfect sub-band synthesis unit is an interference suppression intermediate frequency signal.
10. The interference suppression device based on perfect subband splitting of claim 6, wherein the quadrature digital down-conversion module comprises:
the down-conversion two-phase decomposition unit carries out two-phase decomposition on the interference suppression intermediate frequency signal, so as to generate two paths of time interleaving data with halved data rate;
the down-conversion first symbol conversion unit inverts the first path of time interleaving data once every one symbol to obtain inverted time interleaving data, and the down-conversion first symbol conversion unit is connected with the down-conversion two-phase decomposition unit;
a down-conversion second symbol conversion unit, which inverts the second path of time interleaving data once every one symbol to obtain the inverted time interleaving data, and is connected with the down-conversion two-phase decomposition unit;
the down-conversion half-band filtering unit is used for performing low-pass half-band filtering on the inverse time interleaving data of the down-conversion first symbol conversion unit so as to obtain filtering interleaving data, and the down-conversion half-band filtering unit is connected with the down-conversion first symbol conversion unit;
the down-conversion delay unit is used for carrying out integral multiple delay on the output result of the down-conversion second symbol conversion unit, the number of the integral multiple delay is half of the number of taps of the low-pass half-band filter, and accordingly inverse delay data are obtained, and the down-conversion delay unit is connected with the down-conversion second symbol conversion unit;
and the down-conversion gain adjustment unit is used for performing gain adjustment on the filtering interleaving data and the inverse delay data to respectively generate a real component and an imaginary component of an output baseband signal with the interference signal suppressed, and is connected with the down-conversion half-band filtering unit and the down-conversion delay unit.
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