CN103973616B - A kind of signal filtering method and system - Google Patents
A kind of signal filtering method and system Download PDFInfo
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- CN103973616B CN103973616B CN201410153198.7A CN201410153198A CN103973616B CN 103973616 B CN103973616 B CN 103973616B CN 201410153198 A CN201410153198 A CN 201410153198A CN 103973616 B CN103973616 B CN 103973616B
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Abstract
The embodiment of the present application provides a kind of signal filtering method and system, and method therein is specifically included：First frequency spectrum shift processing is carried out to discontinuous band signal, so that the frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of the discontinuous band signal after the processing of the first frequency spectrum shift；First low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the first frequency spectrum shift；Second frequency spectrum shift processing is carried out to the discontinuous band signal after the first low-pass filtering treatment, so that the frequency deviation of one group of nearby frequency bands is symmetrical in one group of outer end frequency band cycle adjacent with the cycle in each cycle of signal；Second low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the second frequency spectrum shift；The processing of the 3rd frequency spectrum shift is carried out to the discontinuous band signal after the second low-pass filtering treatment, to recover to initial spectrum position.The embodiment of the present application can obtain the inhibition of preferable spurious signal with relatively low hardware complexity.
Description
Technical field
The application is related to wireless communication technology field, more particularly to a kind of signal filtering method and system.
Background technology
In wireless communication technology field, if to realize high transmission speed, wider frequency band must be obtained, but by
It is allocated in the component frequency resource in a variety of causes, wider frequency band, therefore to avoid the frequency resource being allocated,
Existing communication system generally generates modulated signal in the discrete mode of frequency band.For example, referring to Fig. 1, a kind of non-company is shown
The schematic diagram of the modulated signal of continuous frequency band, wherein, Sa is the frequency spectrum of first group of frequency band, and fa1, fa2 are respectively first group of frequency band
Initial frequency and cut-off frequency, Sb is the frequency spectrum of second group of frequency band, and fb1, fb2 are respectively the initial frequency of second group of frequency band
And cut-off frequency.
The modulating mode of the modulated signal of discontinuous frequency band can mainly include in the prior art：
1st, single carrier mode
Reference picture 2, shows that a kind of use single carrier mode of prior art modulates the stream of the modulated signal of discontinuous frequency band
Journey schematic diagram, wherein, the encoded module 201 of base band data of user enters resource mapping module 202, coded data quilt after encoding
The resource mapping module 202, which is mapped to after corresponding radio bearer (RB, Radio Bear) resource, enters OFDM
(OFDM, Orthogonal Frequency Division Multiplexing) symbol generation module 203, the OFDM symbol
The low-pass filtered module 204 of OFDM symbol that generation module 203 is exported enters D/A converter module 205, the digital-to-analogue after filtering
The analog signal that modular converter 205 is exported enters modulation module 206, and the modulated signal that the modulation module 206 is exported is through power
Amplification module 207 is exported after amplifying.
Above-mentioned single carrier mode has simple in construction, the advantage of more than 2 discontinuous frequency bands of flexible support；However, its nothing
Method effectively suppresses in discontinuous frequency band, not even the spurious signal outside sequential frequency band, by taking the filtering of modulated signal shown in Fig. 1 as an example,
It is smaller (assuming that fa1 absolute value is less than the exhausted of fb2 that existing low-pass filtering module 204 is typically based on absolute value in fa1 and fb2
To value) one of design low pass filter, the low pass filter of this kind of method design can not effectively suppress second group of frequency band in fb2
Neighbouring outer end interference, can not also suppress the interference between two groups of frequency bands, these interference directly affects the property of communication system
Energy.
2nd, dual carrier pattern
Reference picture 3, shows a kind of stream of the modulated signal of the discontinuous frequency band of use dual carrier mode modulation of prior art
Journey schematic diagram, wherein, the encoded module 301 of base band data of different frequency bands respectively enters independent processing unit after encoding, with
Exemplified by the filtering of modulated signal shown in Fig. 1, the corresponding processing unit of first group of frequency band can specifically include：Resource mapping module
302a, OFDM symbol generation module 303a, low-pass filtering module 304a, D/A converter module 305a, modulation module 306a and work(
Rate amplification module 307a, the corresponding processing unit of second group of frequency band can specifically include：Resource mapping module 302b, OFDM symbol
Generation module 303b, low-pass filtering module 304b, D/A converter module 305b, modulation module 306b and power amplifier module
307b。
Above-mentioned dual carrier pattern needs higher sampling rate, causes the exponent number of low pass filter higher, ultimately results in miscellaneous
The inhibition of scattered signal is poor；In addition, it needs quantity many set processing units corresponding with number of frequency bands, with hardware configuration
Complicated shortcoming.
The content of the invention
Technical problems to be solved in this application are to provide a kind of signal filtering method and system, can be with relatively low hardware
Complexity obtains the inhibition of preferable spurious signal.
In order to solve the above problems, this application discloses a kind of signal filtering method, including：
First frequency spectrum shift processing is carried out to discontinuous band signal, so that the discontinuous frequency after the processing of the first frequency spectrum shift
The frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of band signal；Wherein, the outer end frequency band is to be located at most in each cycle
The frequency band of outer end；
First low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the first frequency spectrum shift；
Some frequency spectrum shift of level second processing are carried out to the discontinuous band signal after the first low-pass filtering treatment, so that the
In each cycle of discontinuous band signal after the processing of two frequency spectrum shifts in one group of outer end frequency band cycle adjacent with the cycle
The frequency deviation of one group of nearby frequency bands is symmetrical；Wherein, the nearby frequency bands are adjacent with one group of outer end frequency band in each cycle
Frequency band, the series of the second frequency spectrum shift processing subtracts 1 equal to the discontinuous band signal midband quantity；
Some low-pass filtering treatments of level second are carried out to the discontinuous band signal after the processing of some frequency spectrum shifts of level second；
Wherein, the discontinuous band signal after frequency spectrum shift of prime second is handled is carried out working as the low-pass filtering treatment of prime second；
The processing of the 3rd frequency spectrum shift is carried out to the discontinuous band signal after some low-pass filtering treatments of level second, so that the
Discontinuous band signal after the processing of three frequency spectrum shifts recovers to initial spectrum position.
On the other hand, originally disclosed herein as well is a kind of signal filtering system, including：
First frequency spectrum shift processing module, for carrying out the first frequency spectrum shift processing to discontinuous band signal, so that the
The frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of discontinuous band signal after the processing of one frequency spectrum shift；Wherein, it is described
Outer end frequency band is the frequency band for being located at outermost end in each cycle；
First low-pass filtering treatment module, for carrying out first to the discontinuous band signal after the processing of the first frequency spectrum shift
Low-pass filtering treatment；
Second frequency spectrum shift processing module, it is some for being carried out to the discontinuous band signal after the first low-pass filtering treatment
The second frequency spectrum shift of level is handled, so that one group of outer end in each cycle of the discontinuous band signal after the processing of the second frequency spectrum shift
The frequency deviation of one group of nearby frequency bands is symmetrical in the frequency band cycle adjacent with the cycle；Wherein, the nearby frequency bands are in each cycle
The frequency band adjacent with one group of outer end frequency band, the series of the second frequency spectrum shift processing is equal to the discontinuous band signal
Midband quantity subtracts 1；
Second low-pass filtering treatment module, for entering to the discontinuous band signal after the processing of some frequency spectrum shifts of level second
Some low-pass filtering treatments of level second of row；Wherein, the discontinuous band signal after frequency spectrum shift of prime second is handled is carried out
When the low-pass filtering treatment of prime second；
3rd frequency spectrum shift processing module, for entering to the discontinuous band signal after some low-pass filtering treatments of level second
The frequency spectrum shift of row the 3rd processing, so that the discontinuous band signal after the processing of the 3rd frequency spectrum shift recovers to initial spectrum position.
Compared with prior art, the application has advantages below：
The principle that the application is repeated using the periodic spectrum of frequency band, multiple frequency spectrum is carried out to discontinuous band signal
Move processing and low-pass filtering treatment；Specifically, each week for causing discontinuous band signal is handled by the first frequency spectrum shift
The frequency deviation of two groups of outer end frequency bands is symmetrical in phase, therefore two groups of outer end frequency band outsides can be effectively filtered out by the first low-pass filtering treatment
Spurious signal；Also, one group of outer end frequency in each cycle for causing discontinuous band signal is handled by the second frequency spectrum shift
The frequency deviation of nearby frequency bands is symmetrical in the band cycle adjacent with the cycle, and the nearby frequency bands are in each cycle and one group of outer end
The adjacent frequency band of frequency band, therefore the processing of the second frequency spectrum shift can be corresponding by one group of outer end frequency band in each cycle of signal
The region that low pass filter does not allow to pass through is moved in part between one group of nearby frequency bands, so as to pass through the second low pass filtered
Ripple processing filters out this
Spurious signal between two groups of frequency bands；In the modulation applied to discontinuous band signal, the application can make
In the case of using single-carrier modulated, the spurious signal of frequency band outside can either be effectively filtered out, any two can be effectively filtered out again
Spurious signal between frequency band, in a word, the application can obtain the suppression of preferable spurious signal with relatively low hardware complexity
Effect.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the modulated signal of discontinuous frequency band；
Fig. 2 is the schematic flow sheet for the modulated signal that a kind of use single carrier mode of prior art modulates discontinuous frequency band；
Fig. 3 is a kind of schematic flow sheet of the modulated signal of the discontinuous frequency band of use dual carrier mode modulation of prior art；
Fig. 4 is the flow chart for the signal filtering method that the embodiment of the present application one is provided；
Fig. 5 is the flow chart for the signal filtering method that the embodiment of the present application three is provided；
Fig. 6 is that the application is a kind of handles schematic diagram to signal filtering shown in Fig. 1；
Fig. 6 (a) is a kind of schematic diagram that frequency band division is carried out to discontinuous band signal shown in Fig. 1 of the application；
Fig. 6 (b) is that the application is a kind of to be carried out after the first frequency spectrum shift processing to discontinuous band signal shown in Fig. 6 (a)
Signal spectrum schematic diagram；
Fig. 6 (c) is that the application is a kind of to be carried out after the second frequency spectrum shift processing to discontinuous band signal shown in Fig. 6 (b)
Signal spectrum schematic diagram；
Fig. 7 is the flow chart for the signal filtering method that the embodiment of the present application four is provided；
Fig. 8 is a kind of signal filtering processing schematic diagram of the application；
Fig. 8 (a) is a kind of spectrum diagram for the discontinuous band signal for including three groups of frequency bands of the application；
Fig. 8 (b) is that the application is a kind of to be carried out after the first frequency spectrum shift processing to discontinuous band signal shown in Fig. 8 (a)
Signal spectrum schematic diagram；
Fig. 8 (c) is that the application is a kind of carries out the processing of the frequency spectrum shift of one-level second to discontinuous band signal shown in Fig. 8 (b)
Signal spectrum schematic diagram afterwards；
Fig. 8 (d), which is that the application is a kind of, carries out two grade of second frequency spectrum shift processing to discontinuous band signal shown in Fig. 8 (c)
Signal spectrum schematic diagram afterwards；
Fig. 9 is a kind of structure chart of signal filtering system of the embodiment of the present application.
Embodiment
It is below in conjunction with the accompanying drawings and specific real to enable above-mentioned purpose, the feature and advantage of the application more obvious understandable
Mode is applied to be described in further detail the application.
Embodiment one
Reference picture 4, gives the flow chart of the signal filtering method of the offer of the embodiment of the present application one, can specifically include：
Step 401, to discontinuous band signal carry out the first frequency spectrum shift processing so that the first frequency spectrum shift processing after
The frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of discontinuous band signal；Wherein, the outer end frequency band is each cycle
The interior frequency band positioned at outermost end；
Step 402, to the first frequency spectrum shift processing after discontinuous band signal carry out the first low-pass filtering treatment；
Step 403, to after the first low-pass filtering treatment discontinuous band signal carry out the second frequency spectrum shift processing so that
One group of outer end frequency band cycle adjacent with the cycle in each cycle of discontinuous band signal after the processing of second frequency spectrum shift
The frequency deviation of interior one group of nearby frequency bands is symmetrical；Wherein, the nearby frequency bands are adjacent with one group of outer end frequency band in each cycle
Frequency band；
Assuming that include one group of outer end frequency band 1, one group of nearby frequency bands 2 adjacent with outer end frequency band 1 in each cycle of signal,
And assume that cycle A and B are adjacent periods, then, outer end in the cycle A of the discontinuous band signal after the processing of the second frequency spectrum shift
The frequency deviation of nearby frequency bands 2 ' should be symmetrical in frequency band 1 and cycle B, or, the discontinuous frequency band after the processing of the second frequency spectrum shift
The frequency deviation of outer end frequency band 1 ' should be symmetrical in nearby frequency bands 2 and cycle B in the cycle A of signal.
Step 404, to the second frequency spectrum shift processing after discontinuous band signal carry out the second low-pass filtering treatment；
Step 405, to after the second low-pass filtering treatment discontinuous band signal carry out the 3rd frequency spectrum shift processing so that
Discontinuous band signal after the processing of 3rd frequency spectrum shift recovers to initial spectrum position.
The application can apply to include the signal of two groups and frequency band more than two, to realize to spurious signal in signal
Suppression.
The application is realized to miscellaneous by carrying out multiple frequency spectrum shift processing and low-pass filtering treatment to discontinuous band signal
The suppression of scattered signal；
Wherein, the purpose of the first frequency spectrum shift is to provide condition for the first low-pass filtering treatment, so that the first LPF
Filter out the spurious signal of two groups of frequency band outsides；First frequency spectrum shift is handled two in each cycle for causing discontinuous band signal
The frequency deviation of group outer end frequency band is symmetrical, therefore the spuious of two groups of outer end frequency band outsides can be effectively filtered out by the first low-pass filtering treatment
Signal；
The purpose of second frequency spectrum shift is to provide condition for the second low-pass filtering treatment, so that the second LPF is effectively filtered
Except the spurious signal between adjacent any two groups of frequency bands；It should be noted that as modulated signal, discontinuous band signal is
Sample obtained discrete-time signal, and the frequency spectrum of discrete-time signal is the cycle, its cycle is equal to sample frequency, therefore can be with
It is interpreted as, the frequency spectrum of discontinuous band signal midband can be repeated cyclically appearance, therefore, it can the frequency spectrum week using frequency band
The principle that phase property repeats, by the second frequency spectrum shift by a certain group of outer end frequency in each cycle of the discontinuous band signal
The region that low pass filter does not allow to pass through is moved with the part between one group of corresponding nearby frequency bands, can now be led to
Cross the second low-pass filtering treatment and filter out spurious signal between two groups of frequency bands；
In the modulation applied to discontinuous band signal, the application can be in the case of using single-carrier modulated, both
The spurious signal of frequency band outside can be effectively filtered out, the spurious signal between any two frequency band can be effectively filtered out again, in a word
The application can obtain the inhibition of preferable spurious signal with relatively low hardware complexity.
Embodiment two
The signal filtering method of the present embodiment can also be included such as on the basis of above-mentioned embodiment illustrated in fig. 4, further
Under optional technical scheme.
The above-mentioned discontinuous band signal to after the first low-pass filtering treatment of the present embodiment is carried out at the second frequency spectrum shift
The step 403 of reason, can specifically include：Some frequency spectrum shift of level second processing are carried out to discontinuous band signal；Wherein, it is above-mentioned
The series of second frequency spectrum shift processing subtracts 1 equal to above-mentioned discontinuous band signal midband quantity；
The step of then discontinuous band signal after the above-mentioned processing to the second frequency spectrum shift carries out the second low-pass filtering treatment
404, it can specifically include：Some low-pass filtering treatments of level second are carried out to discontinuous band signal, wherein, to when prime second
Discontinuous band signal after frequency spectrum shift processing carries out working as the low-pass filtering treatment of prime second.
For including the discontinuous band signal of N group frequency bands, it there may be between its two groups of adjacent frequency band
Spurious signal, it can include N-1 group spurious signals altogether, therefore embodiment 2 can then be handled by the second frequency spectrum shift of N-1 levels
The N-1 group spurious signals are filtered out with the second low-pass filtering treatment.
In actual applications, the N-1 group spurious signals filter out flow and can specifically included：The of first group of spurious signal
The processing of two frequency spectrum shifts and the second low-pass filtering treatment (processing of the second frequency spectrum shift of this paper abbreviations one-level and the low pass filtered of one-level second
Ripple processing), the second frequency spectrum shift processing of second group of spurious signal and the second low-pass filtering treatment (referred to as two grade second frequency herein
Spectrum moves processing and two grade of second low-pass filtering treatment) ... and the second frequency spectrum shift processing of N-1 group spurious signals and the
Two low-pass filtering treatments (processing of the second frequency spectrum shift of this paper abbreviations N-1 levels and the second low-pass filtering treatment of N-1 levels).
When the series of above-mentioned second frequency spectrum shift processing is more than 1, the low-pass filtering treatment of upper level second is output as working as
The input of the frequency spectrum shift of prime second processing, therefore, the above-mentioned discontinuous band signal to after the first low-pass filtering treatment are carried out
The step of some frequency spectrum shifts of level second are handled, can specifically include：
The processing of the frequency spectrum shift of one-level second is carried out to the discontinuous band signal after the first low-pass filtering treatment, so that one-level
Discontinuous band signal after the processing of second frequency spectrum shift carries out the low-pass filtering treatment of one-level second；
Discontinuous band signal after the low-pass filtering treatment of upper level second is carried out when the processing of the frequency spectrum shift of prime second,
So that the discontinuous band signal after frequency spectrum shift of prime second is handled carries out working as the low-pass filtering treatment of prime second.
Alternatively, above-mentioned second frequency spectrum shift processing series be equal to 2 when, it is above-mentioned to the first low-pass filtering treatment after
Discontinuous band signal carries out the step of some frequency spectrum shifts of level second are handled, and can specifically include：
The processing of the frequency spectrum shift of one-level second is carried out to the discontinuous band signal after the first low-pass filtering treatment, so that one-level
One group of outer end frequency band cycle adjacent with the cycle in each cycle of discontinuous band signal after the processing of second frequency spectrum shift
The frequency deviations of interior one group of nearby frequency bands is symmetrical, so that the discontinuous band signal after the processing of the frequency spectrum shift of one-level second carries out one-level the
Two low-pass filtering treatments；
Two grade of second frequency spectrum shift processing is carried out to the discontinuous band signal after the low-pass filtering treatment of one-level second, so that
Another group of outer end frequency band is adjacent with the cycle in each cycle of discontinuous band signal after two grade of second frequency spectrum shift processing
Cycle in one group of nearby frequency bands frequency deviation it is symmetrical so that the discontinuous band signal after two grade of second frequency spectrum shift processing is carried out
Two grade of second low-pass filtering treatment.
To make those skilled in the art more fully understand the embodiment of the present application, individually below with include two groups and three groups frequency
Above-mentioned signal filtering method is illustrated exemplified by the signal of band.
Embodiment three
Reference picture 5, gives the flow chart of the signal filtering method of the offer of the embodiment of the present application three, the discontinuous frequency band letter
It can number specifically include two groups of frequency bands, corresponding filtering method can specifically include：
Step 501, to discontinuous band signal carry out the first frequency spectrum shift processing so that the first frequency spectrum shift processing after
The frequency deviation of two groups of frequency bands is symmetrical in each cycle of discontinuous band signal；
Step 502, to the first frequency spectrum shift processing after discontinuous band signal carry out the first low-pass filtering treatment；
Herein it is main by taking the modulated signal of discontinuous frequency band shown in Fig. 1 as an example to including the discontinuous frequency bands of two groups of frequency bands
Signal is illustrated, reference picture 6, is shown that the application is a kind of and is handled schematic diagram to signal filtering shown in Fig. 1, wherein, Fig. 6 (a)
Frequency band in a cycle is divided, the frequency spectrum after division can also include outside S1, Sb on the outside of Sa in addition to Sa and Sb
S3 between the S2 and Sa and Sb of side, spurious signal is possible to appear in any in S1, S2 and S3；In figure, S1, S2 and S3
Shown with different shades.
The purpose of first frequency spectrum shift is to provide condition for the first low-pass filtering treatment, so that the first LPF filters out two
Group frequency band outside spurious signal, be then for Fig. 6 (a) to filter out fall into it is spuious in S1 and S2.
Because fa1, fb2 may be asymmetric in frequency deviation, therefore, it is necessary to discontinuous to this before the first LPF is carried out
Band signal carries out the first frequency spectrum shift, in each cycle to ensure the discontinuous band signal after the processing of the first frequency spectrum shift
The frequency deviation of two groups of frequency bands is symmetrical, wherein, the one group of frequency band Sa in left side frequency deviation (is usually relative to centre frequency for its initial frequency
Carrier frequency) skew, the skew of the one group of frequency band Sb in the right frequency deviation for its cut-off frequency relative to centre frequency.
In actual applications, two in each cycle of the discontinuous band signal after being handled according to the first frequency spectrum shift
The symmetrical condition of frequency deviation of group frequency band establishes an equation, and solves the frequency spectrum shift value of the first frequency spectrum shift processing, certainly other to obtain
The method for taking the frequency spectrum shift value of the first frequency spectrum shift processing is also feasible.
Understand that the frequency spectrum shift value that the first frequency spectrum shift is handled is through solvingAs Δ f1During to bear,
Illustrate to move signal spectrum to the left, as Δ f1For timing, illustrate to move signal spectrum to the right.
Reference picture 6 (b), shows and the signal spectrum schematic diagram after the first frequency spectrum shift processing is carried out to Fig. 6 (a), it will
A S1 part is moved to the right, and the frequency deviation for moving the rear one group of frequency band Sa in the left side is-fs1, the one group of frequency band Sb in the right frequency deviation is
fs1.Therefore when carrying out the first low-pass filtering treatment, can be according to fs1Design the parameter of corresponding first low pass filter.Due to
The frequency deviation of two groups of frequency bands is symmetrical in each cycle of discontinuous band signal after the processing of one frequency spectrum shift, therefore can be passed through
First low-pass filtering treatment effectively filters out the spurious signal of two groups of frequency band outsides；Fallen into for example, can filter out completely in S1 and S2
It is spuious.
Step 503, to after the first low-pass filtering treatment discontinuous band signal carry out the second frequency spectrum shift processing so that
It is another in one group of frequency band cycle adjacent with the cycle in each cycle of discontinuous band signal after the processing of second frequency spectrum shift
The frequency deviation of one group of frequency band is symmetrical；
Step 504, to the second frequency spectrum shift processing after discontinuous band signal carry out the second low-pass filtering treatment；
The purpose of second frequency spectrum shift is to provide condition for the second low-pass filtering treatment, so that the second LPF is effectively filtered
Except the spurious signal between two groups of frequency bands.
It should be noted that the discrete-time signal obtained as modulated signal, discontinuous band signal for sampling, and from
The frequency spectrum for dissipating time signal is the cycle, and its cycle is equal to sample frequency, therefore it is to be understood that after the processing of the first frequency spectrum shift
The frequency spectrum of two groups of frequency bands can repeat by the cycle of Fs in discontinuous band signal；It therefore, it can the frequency using two groups of frequency bands
Spectrum is repeated cyclically the principle of appearance, and the part between two groups of frequency bands is moved into the region that low pass filter does not allow to pass through.
In specific implementation, to make the second LPF effectively filter out the spurious signal between two groups of frequency bands, should ensure that
It is another in one group of frequency band cycle adjacent with the cycle in each cycle of discontinuous band signal after the processing of two frequency spectrum shifts
The frequency deviation of group frequency band is symmetrical.
Specifically, one group in each cycle of the discontinuous band signal after being handled according to above-mentioned second frequency spectrum shift
The symmetrical condition of frequency deviation of another group of frequency band establishes an equation in the frequency band cycle adjacent with the cycle, and solves the second frequency spectrum shift
The frequency spectrum shift value of processing, the method for certainly other frequency spectrum shift values for obtaining the processing of the second frequency spectrum shift is also feasible.
Example in correspondence, the frequency spectrum shift value of the second frequency spectrum shift isWherein Fs is to adopt
Sample frequency.Reference picture 6 (c), shows and the signal spectrum schematic diagram after the second frequency spectrum shift processing is carried out to Fig. 6 (b), it is by S2
Move respectively near-Fs/2 and Fs/2, the frequency deviation for moving the rear one group of frequency band Sb in the left side is-fs2, the one group of frequency band Sa in the right frequency
It is f partiallys2.Therefore when carrying out the second low-pass filtering treatment, can be according to fs2The parameter of corresponding second low pass filter is designed, by
The part between two groups of frequency bands is removed in the processing of the second frequency spectrum shift and has been moved to the region that low pass filter does not allow to pass through, therefore can
To filter out the spurious signal between two groups of frequency bands by the second low-pass filtering treatment.
Step 105, to after the second low-pass filtering treatment discontinuous band signal carry out the 3rd frequency spectrum shift processing so that
Discontinuous band signal after the processing of 3rd frequency spectrum shift recovers to initial spectrum position.
The purpose of 3rd frequency spectrum shift is that signal spectrum position is recovered to initial spectrum position.
For the frequency spectrum shift value of the 3rd frequency spectrum shift processing, due to its solution procedure and the processing of the first frequency spectrum shift
Similar with the solution procedure of the frequency spectrum shift value of the second frequency spectrum shift processing, and therefore not to repeat here, cross-referenced.
For example, the frequency spectrum shift value of Fig. 6 (c) correspondence the 3rd frequency spectrum shift processing isMove
Afterwards shown in signal spectrum such as Fig. 6 (a), that is, the spectrum distribution of signal when being reduced to initial.
Example IV
Reference picture 7, gives the flow chart of the signal filtering method of the offer of the embodiment of the present application four, the discontinuous frequency band letter
It can number specifically include three groups of frequency bands, corresponding filtering method can specifically include：
Step 701, to discontinuous band signal carry out the first frequency spectrum shift processing so that the first frequency spectrum shift processing after
The frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of discontinuous band signal；
Step 702, to the first frequency spectrum shift processing after discontinuous band signal carry out the first low-pass filtering treatment；
Similar with the first frequency spectrum shift of two groups of frequency bands, the purpose of the first frequency spectrum shift of three groups of frequency bands is also for first
Low-pass filtering treatment provides condition, so that the first LPF filters out the spurious signal of two groups of frequency band outsides.
Reference picture 8, shows a kind of signal filtering processing schematic diagram of the application, wherein, Fig. 8 (a), which is shown, includes three
It can specifically include Sa, Sb and Sc in the original signal spectrum schematic diagram of the discontinuous band signal of group frequency band, its frequency band a cycle；
Wherein two groups outer end frequency bands are Sa and Sc, because fa1, fc2 may be asymmetric in frequency deviation, therefore are carrying out the first LPF
It is preceding, it is necessary to the first frequency spectrum shift be carried out to the discontinuous band signal, to ensure the discontinuous frequency after the processing of the first frequency spectrum shift
The frequency deviation of two groups of frequency bands is symmetrical in each cycle of band signal, wherein, left side outer end frequency band Sa frequency deviation is its initial frequency phase
For the skew of centre frequency (be usually carrier frequency), the right outer end frequency band Sc frequency deviation is its cut-off frequency relative to center
The skew of frequency.
In actual applications, two in each cycle of the discontinuous band signal after being handled according to the first frequency spectrum shift
Group outer end frequency band the symmetrical condition of frequency deviation establish an equation, and solve the first frequency spectrum shift processing frequency spectrum shift value, certainly its
The method that it obtains the frequency spectrum shift value of the first frequency spectrum shift processing is also feasible.
Understand that the frequency spectrum shift value that the first frequency spectrum shift is handled is through solvingAs Δ f '1It is negative
When, illustrate to move signal spectrum to the left, as Δ f '1For timing, illustrate to move signal spectrum to the right.
Reference picture 8 (b), shows and the signal spectrum schematic diagram after the first frequency spectrum shift processing is carried out to Fig. 8 (a), wherein,
Left side outer end frequency band Sa frequency deviation is-f 's1, the right outer end frequency band Sc frequency deviation is f 's1.Therefore carrying out at the first LPF
, can be according to f ' during reasons1Design the parameter of corresponding first low pass filter.Due to the discontinuous frequency after the processing of the first frequency spectrum shift
The frequency deviation of two groups of outer end frequency bands is symmetrical in each cycle of band signal, therefore can effectively be filtered by the first low-pass filtering treatment
Except the spurious signal of two groups of outer end frequency band outsides.
Step 703, one-level second frequency spectrum shift carried out to the discontinuous band signal after the first low-pass filtering treatment handle,
So that one group of outer end frequency band and the cycle phase in each cycle of discontinuous band signal after the processing of the frequency spectrum shift of one-level second
The frequency deviation of one group of nearby frequency bands is symmetrical in the adjacent cycle；Wherein, one group of nearby frequency bands are in each cycle and one group of outer end
The adjacent frequency band of frequency band；
Step 704, to the frequency spectrum shift of one-level second processing after discontinuous band signal carry out the LPF of one-level second
Processing；
The purpose of the frequency spectrum shift of one-level second is to provide condition for the low-pass filtering treatment of one-level second, so that one-level second is low
Pass filter effectively filters out the spurious signal between one group of outer end frequency band and one group of nearby frequency bands.Then it is to filter by taking Fig. 8 (b) as an example
Except the spurious signal between Sa and Sb, or filter out the spurious signal between Sc and Sb.
Exemplified by filtering out the spurious signal between Sa and Sb, then need the part between Sa and Sb moving LPF
Device does not allow the region passed through.
In specific implementation, to make the LPF of one-level second effectively filter out the spurious signal between two groups of frequency bands, Ying Bao
Demonstrate,prove one group of outer end frequency band in each cycle of the discontinuous band signal after the processing of the frequency spectrum shift of one-level second adjacent with the cycle
Cycle in one group of nearby frequency bands frequency deviation it is symmetrical, that is, in the cycle adjacent with the cycle Sa in certain cycle Sb frequency deviation pair
Claim.
Specifically, can be according to the symmetrical condition row side of frequency deviation of Sb in the cycle adjacent with the cycle Sa in certain cycle
Journey, and the frequency spectrum shift value of the frequency spectrum shift of one-level second processing is solved, certainly other acquisition one-level second frequency spectrum shift processing
The method of frequency spectrum shift value be also feasible.
Example in correspondence, the frequency spectrum shift value of the frequency spectrum shift of one-level second isReference picture
8 (c), shows the signal spectrum schematic diagram carried out to Fig. 8 (b) after the processing of the frequency spectrum shift of one-level second, wherein, left side outer end frequency
Frequency deviation with Sb is-f 's2, the right outer end frequency band Sa frequency deviation is f 's2.Therefore when carrying out the second low-pass filtering treatment of one-level, can
With according to f 's2Design the parameter of corresponding second low pass filter.Because the frequency spectrum shift of one-level second is handled two groups of frequencies of Sa and Sb
Part between band, which is removed, has been moved to the region that low pass filter does not allow to pass through, therefore can pass through the low-pass filtering treatment of one-level second
Filter out the spurious signal between two groups of frequency bands of Sa and Sb.
Step 705, to after the low-pass filtering treatment of one-level second discontinuous band signal carry out two grade of second frequency spectrum shift
Handle, so that another group of outer end frequency band is with being somebody's turn to do in each cycle of the discontinuous band signal after two grade of second frequency spectrum shift processing
The frequency deviation of one group of nearby frequency bands is symmetrical in adjacent cycle in cycle；
Step 706, two grade of second LPF is carried out to the discontinuous band signal after the processing of two grade of second frequency spectrum shift
Processing；
The purpose of two grade of second frequency spectrum shift is to provide condition for two grade of second low-pass filtering treatment, so that two grade second low
Pass filter effectively filters out miscellaneous between one group of nearby frequency bands in another group of outer end frequency band cycle adjacent with the cycle in certain cycle
Scattered signal.
Because the low-pass filtering treatment of one-level second above has filtered out the spurious signal between Sa and Sb, therefore here two grades
Second low-pass filtering treatment needs to filter out the spurious signal between Sc and Sb.In specific implementation, then need between Sc and Sb
Part move the region that low pass filter does not allow to pass through.
In specific implementation, to make two grade of second LPF effectively filter out the spuious letter between two groups of frequency bands of Sc and Sb
Number, it should ensure that another group of outer end frequency band is with being somebody's turn to do in each cycle of the discontinuous band signal after two grade of second frequency spectrum shift processing
The frequency deviation of one group of nearby frequency bands is symmetrical in adjacent cycle in cycle, that is, in the cycle adjacent with the cycle Sc in each cycle
Sb frequency deviation is symmetrical.
Specifically, can be according to the symmetrical condition row side of frequency deviation of Sb in the cycle adjacent with the cycle Sc in each cycle
Journey, and the frequency spectrum shift value of two grade of second frequency spectrum shift processing is solved, it is certainly other to obtain two grade of second frequency spectrum shift processing
The method of frequency spectrum shift value be also feasible.
Example in correspondence, the frequency spectrum shift value of two grade of second frequency spectrum shift
Reference picture 8 (d), shows the signal spectrum schematic diagram carried out to Fig. 8 (c) after two grade of second frequency spectrum shift processing, wherein, the left side
Outer end frequency band Sc frequency deviation is-f 's3, the right outer end frequency band Sb frequency deviation is f 's3.Therefore carrying out at two grade of second LPF
, can be according to f ' during reasons3Design the parameter of corresponding two grade of second low pass filter.Because two grade of second frequency spectrum shift is handled Sb
Part between two groups of frequency bands of Sc, which is removed, has been moved to the region that low pass filter does not allow to pass through, therefore can be low by two grade second
Pass filter processing filters out the spurious signal between two groups of frequency bands of Sb and Sc.
Step 707, to after two grade of second low-pass filtering treatment discontinuous band signal carry out the 3rd frequency spectrum shift processing,
So that the discontinuous band signal after the processing of the 3rd frequency spectrum shift recovers to initial spectrum position.
The purpose of 3rd frequency spectrum shift is that signal spectrum position is recovered to initial spectrum position.
For the frequency spectrum shift value of the 3rd frequency spectrum shift processingBecause it was solved
The solution procedure for the frequency spectrum shift value that journey is handled with the first frequency spectrum shift and the second frequency spectrum shift is handled is similar, therefore does not go to live in the household of one's in-laws on getting married herein
State, it is cross-referenced.
It should be noted that for including the signal filtering of three groups of frequency bands, its second frequency spectrum shift processing and the
Two low-pass filtering treatments be in order to effectively filter out the spurious signal between two groups of outer end frequency bands and one group of nearby frequency bands, using Fig. 8 as
Example, then be the spurious signal between Sa to be filtered out and Sb, and filters out the spurious signal between Sc and Sb, in specific implementation,
First filter out the spurious signal between Sa and Sb and filter out spurious signal between Sc and Sb again, or, first filter out between Sc and Sb
Spurious signal filters out the spurious signal between Sa and Sb again, is feasible, the application is to spuious between specific two groups of frequency bands
The order that filters out of signal is not any limitation as.
Therefore, for including the signal filtering of three groups and more than three groups frequency bands, its second frequency spectrum shift processing and
Second low-pass filtering treatment is to effectively filter out between two groups of outer end frequency bands and one group of nearby frequency bands and two adjacent groups are adjacent
Spurious signal between frequency band；, can be according to the above-mentioned signal filtering process for including multigroup frequency band one by one in specific implementation
Filter out the spurious signal between any two groups of frequency bands, specifically, one in two adjacent groups frequency band group can be moved to outer end with
Filter out the spurious signal between two adjacent groups nearby frequency bands；
Or, in a kind of alternative embodiment of the application, above-mentioned signal filtering method can also include：
Step S101, by the band decomposition of discontinuous band signal be two parts frequency band；
Step S102, carry out according to the above-mentioned signal filtering process for including two groups of frequency bands two parts frequency band outside and should
Spurious signal between two parts frequency band is filtered out；
Step S103, respectively progress filtering out per partial-band internal stray signal；
Wherein, step S102 can specifically include：
Sub-step S211, to discontinuous band signal carry out the first frequency spectrum shift processing so that the first frequency spectrum shift handle
The frequency deviation of two parts frequency band is symmetrical in each cycle of discontinuous band signal afterwards；
Sub-step S212, to the first frequency spectrum shift processing after discontinuous band signal carry out the first low-pass filtering treatment；
Sub-step S213, to after the first low-pass filtering treatment discontinuous band signal carry out the second frequency spectrum shift processing,
So that a part of frequency band week adjacent with the cycle in each cycle of discontinuous band signal after the processing of the second frequency spectrum shift
The frequency deviation of another part frequency band is symmetrical in phase；
Sub-step S214, to the second frequency spectrum shift processing after discontinuous band signal carry out the second low-pass filtering treatment.
For example, for the discontinuous band signal for including three groups of frequency bands shown in Fig. 8 (a), can be by its frequency band
Two parts are decomposed into, Part I can specifically include Sa, Sb, and Part II can specifically include Sc, then, can be by first
Two groups of partial frequency bands regard an entirety (one group of frequency band) as, filtered out by above-mentioned sub-step S211-S214 on the outside of Part I,
Part II outside and the spurious signal between Part I and Part II.
And step S103 can carry out filtering out for every partial-band internal stray signal respectively, for above-mentioned Part I then
Be filter out it is spuious between Sa and Sb, due to Part II only include a frequency band thus need not filter out.
In a word, those skilled in the art can be flexibly utilized by embodiment illustrated in fig. 4 carry out include three groups and three groups with
The signal filtering of upper frequency band, the embodiment of the present application is not any limitation as to specific operational mode.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it to be all expressed as to a series of action group
Close, but those skilled in the art should know, the embodiment of the present invention is not limited by described sequence of movement, because according to
According to the embodiment of the present invention, some steps can be carried out sequentially or simultaneously using other.Secondly, those skilled in the art also should
Know, embodiment described in this description belongs to preferred embodiment, the involved action not necessarily present invention is implemented
Necessary to example.
Reference picture 9 can specifically include there is provided a kind of structure chart of signal filtering system of the embodiment of the present application：Successively
Connected the first frequency spectrum shift processing module 901, the first low-pass filtering treatment module 902, the second frequency spectrum shift processing module
903rd, the second low-pass filtering treatment module 904 and the 3rd frequency spectrum shift processing module 905.
Wherein, the first frequency spectrum shift processing module 901, for carrying out the first frequency spectrum shift to above-mentioned discontinuous band signal
Processing so that the first frequency spectrum shift processing after discontinuous band signal each cycle in two groups of outer end frequency bands frequency deviation pair
Claim；
First low-pass filtering treatment module 902, for being carried out to the discontinuous band signal after the processing of the first frequency spectrum shift
First low-pass filtering treatment；
Second frequency spectrum shift processing module 903, for being carried out to the discontinuous band signal after the first low-pass filtering treatment
Second frequency spectrum shift is handled, so that one group of outer end frequency in each cycle of the discontinuous band signal after the processing of the second frequency spectrum shift
The frequency deviation of one group of nearby frequency bands is symmetrical in the band cycle adjacent with the cycle；
Second low-pass filtering treatment module 904, for being carried out to the discontinuous band signal after the processing of the second frequency spectrum shift
Second low-pass filtering treatment；And
3rd frequency spectrum shift processing module 905, for being carried out to the discontinuous band signal after the second low-pass filtering treatment
3rd frequency spectrum shift processing, so that the discontinuous band signal after the processing of the 3rd frequency spectrum shift recovers to initial spectrum position.
In the modulation applied to discontinuous band signal, the first frequency spectrum shift processing module 901 can also be accorded with OFDM
Number generation module is connected, the discontinuous band signal for receiving the output of OFDM symbol generation module, the processing of the 3rd frequency spectrum shift
Module 905 can also be connected with analog-to-digital conversion module, for the discontinuous band signal after the processing of the 3rd frequency spectrum shift to be exported
To analog-to-digital conversion module.
In a kind of alternative embodiment of the application, above-mentioned second frequency spectrum shift processing module 903 can specifically include：With
In some levels the second frequency spectrum shift processing module that some frequency spectrum shift of level second processing are carried out to discontinuous band signal；Its
In, the series of above-mentioned second frequency spectrum shift processing is equal to number of frequency bands in each cycle of above-mentioned discontinuous band signal and subtracts 1；
Then above-mentioned second low-pass filtering treatment module 904 includes：For carrying out some levels second to discontinuous band signal
Some levels the second low-pass filtering treatment module of low-pass filtering treatment, wherein, when prime the second low-pass filtering treatment module is used for
Discontinuous band signal after the frequency spectrum shift of prime second is handled is carried out to work as the low-pass filtering treatment of prime second.
In a kind of alternative embodiment of the application, when the series of above-mentioned second frequency spectrum shift processing is more than 1, if above-mentioned
Dry level the second frequency spectrum shift processing module can specifically include：
One-level the second frequency spectrum shift processing module, for being carried out to the discontinuous band signal after the first low-pass filtering treatment
The frequency spectrum shift of one-level second processing, so that the discontinuous band signal progress one-level second after the processing of the frequency spectrum shift of one-level second is low
Pass filter processing；
Two grades and the above the second frequency spectrum shift processing module, for discontinuous after the low-pass filtering treatment of upper level second
Band signal is carried out when the processing of the frequency spectrum shift of prime second, so that the discontinuous frequency band letter after frequency spectrum shift of prime second is handled
Number carry out work as the low-pass filtering treatment of prime second.
Wherein, the second frequency spectrum shift of one-level processing module, the second low-pass filtering treatment of one-level module, two grade of second frequency spectrum are removed
Processing module, two grade of second low-pass filtering treatment module ... is moved to be sequentially connected, also, one-level the second frequency spectrum shift processing module
Also be connected with the first low-pass filtering treatment module 902, the second low-pass filtering treatment of afterbody module also with the 3rd frequency spectrum shift
Processing module 905 is connected.
In a kind of alternative embodiment of the application, the series of above-mentioned second frequency spectrum shift processing is equal to 2, then above-mentioned some
The second frequency spectrum shift processing module of level can specifically include：
One-level the second frequency spectrum shift processing module, for being carried out to the discontinuous band signal after the first low-pass filtering treatment
The frequency spectrum shift of one-level second is handled, so that one in each cycle of the discontinuous band signal after the processing of the frequency spectrum shift of one-level second
The frequency deviation of one group of nearby frequency bands is symmetrical in the group outer end frequency band cycle adjacent with the cycle, so that the frequency spectrum shift of one-level second is handled
Discontinuous band signal afterwards carries out the low-pass filtering treatment of one-level second；
Two grade of second frequency spectrum shift processing module, for the discontinuous band signal after the low-pass filtering treatment of one-level second
Two grade of second frequency spectrum shift processing is carried out, so that each cycle of the discontinuous band signal after two grade of second frequency spectrum shift processing
The frequency deviation of one group of nearby frequency bands is symmetrical in the interior another group of outer end frequency band cycle adjacent with the cycle, so that two grade of second frequency spectrum is removed
Discontinuous band signal after shifting processing carries out two grade of second low-pass filtering treatment.
In a kind of alternative embodiment of the application, when the series of second frequency spectrum shift processing is more than 1, the system
System can also include：
Decomposing module, for being two parts frequency band by the band decomposition of discontinuous band signal；
First filters out module, for carrying out two parts frequency band outside according to the signal filtering process for including two groups of frequency bands
And spurious signal between two parts frequency band is filtered out；
Second filters out module, for carrying out filtering out for every partial-band internal stray signal respectively；
Wherein, described first filter out module and include：
3rd frequency spectrum shift processing module, for carrying out the processing of the 3rd frequency spectrum shift to discontinuous band signal, so that the
The frequency deviation of two parts frequency band is symmetrical in each cycle of discontinuous band signal after the processing of three frequency spectrum shifts；
3rd low-pass filtering treatment module, for carrying out the 3rd to the discontinuous band signal after the processing of the 3rd frequency spectrum shift
Low-pass filtering treatment；
4th frequency spectrum shift processing module, for carrying out the 4th to the discontinuous band signal after the 3rd low-pass filtering treatment
Frequency spectrum shift is handled, so that a part of frequency band is with being somebody's turn to do in each cycle of the discontinuous band signal after the processing of the 4th frequency spectrum shift
The frequency deviation of another part frequency band is symmetrical in adjacent cycle in cycle；And
4th low-pass filtering treatment module, for carrying out the 4th to the discontinuous band signal after the processing of the 4th frequency spectrum shift
Low-pass filtering treatment.
The signal filtering system of above-described embodiment, by using above-mentioned module realize the suppression of clutter interference to it is above-mentioned related
Realizing for embodiment of the method is identical, and the record of above-described embodiment is may be referred in detail, be will not be repeated here.
Each embodiment in this specification is described by the way of progressive, what each embodiment was stressed be with
Between other differences, each embodiment identical similar part mutually referring to.For device embodiment, by
Substantially similar to embodiment of the method in it, so description is fairly simple, related part illustrates referring to the part of method.
Above to a kind of signal filtering method provided herein and system, it is described in detail, it is used herein
Specific case is set forth to the principle and embodiment of the application, and the explanation of the above is only intended to help and understands the application
Method and its core concept；Simultaneously for those of ordinary skill in the art, according to the thought of the application, in specific implementation
It will change in mode and application, to sum up above-mentioned, this specification content should not be construed as the limitation to the application.
Claims (8)
1. a kind of signal filtering method, it is characterised in that including：
First frequency spectrum shift processing is carried out to discontinuous band signal, so that the discontinuous frequency band letter after the processing of the first frequency spectrum shift
Number each cycle in two groups of outer end frequency bands frequency deviation it is symmetrical；Wherein, the outer end frequency band is to be located at outermost end in each cycle
Frequency band；
First low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the first frequency spectrum shift；
Some frequency spectrum shift of level second processing are carried out to the discontinuous band signal after the first low-pass filtering treatment, so that the second frequency
Spectrum is moved in each cycle of the discontinuous band signal after processing one group in one group of outer end frequency band cycle adjacent with the cycle
The frequency deviation of nearby frequency bands is symmetrical；Wherein, the nearby frequency bands are frequency band adjacent with one group of outer end frequency band in each cycle,
The series of the second frequency spectrum shift processing subtracts 1 equal to the discontinuous band signal midband quantity；
Some low-pass filtering treatments of level second are carried out to the discontinuous band signal after the processing of some frequency spectrum shifts of level second；Its
In, the discontinuous band signal after frequency spectrum shift of prime second is handled is carried out to work as the low-pass filtering treatment of prime second；
The processing of the 3rd frequency spectrum shift is carried out to the discontinuous band signal after some low-pass filtering treatments of level second, so that the 3rd frequency
The discontinuous band signal that spectrum moves after processing recovers to initial spectrum position.
2. the method as described in claim 1, it is characterised in that when the series of second frequency spectrum shift processing is more than 1, institute
State and the step of some frequency spectrum shifts of level second are handled is carried out to discontinuous band signal, including：
The processing of the frequency spectrum shift of one-level second is carried out to the discontinuous band signal after the first low-pass filtering treatment, so that one-level second
Discontinuous band signal after frequency spectrum shift processing carries out the low-pass filtering treatment of one-level second；
Discontinuous band signal after the low-pass filtering treatment of upper level second is carried out when the processing of the frequency spectrum shift of prime second, so that
Discontinuous band signal after the frequency spectrum shift of prime second is handled carries out working as the low-pass filtering treatment of prime second.
3. the method as described in claim 1, it is characterised in that the series of the second frequency spectrum shift processing is equal to 2, then described
The step of some frequency spectrum shifts of level second are handled is carried out to discontinuous band signal, including：
The processing of the frequency spectrum shift of one-level second is carried out to the discontinuous band signal after the first low-pass filtering treatment, so that one-level second
In each cycle of discontinuous band signal after frequency spectrum shift processing one in one group of outer end frequency band cycle adjacent with the cycle
The frequency deviation of group nearby frequency bands is symmetrical, so that the discontinuous band signal progress one-level second after the processing of the frequency spectrum shift of one-level second is low
Pass filter processing；
Two grade of second frequency spectrum shift processing is carried out to the discontinuous band signal after the low-pass filtering treatment of one-level second, so that two grades
Another group of outer end frequency band week adjacent with the cycle in each cycle of discontinuous band signal after the processing of second frequency spectrum shift
The frequency deviation of one group of nearby frequency bands is symmetrical in phase, so that the discontinuous band signal after two grade of second frequency spectrum shift processing carries out two grades
Second low-pass filtering treatment.
4. the method as described in claim 1, it is characterised in that when the series of second frequency spectrum shift processing is more than 1, institute
Stating method also includes：
It is two parts frequency band by the band decomposition of discontinuous band signal；
Signal filtering process according to two groups of frequency bands are included is carried out between two parts frequency band outside and two parts frequency band
Spurious signal is filtered out；
Filtering out per partial-band internal stray signal is carried out respectively；
Wherein, it is described to carry out two parts frequency band outside and two parts frequency according to the signal filtering process for including two groups of frequency bands
The step of filtering out of spurious signal between band, including：
The processing of the 3rd frequency spectrum shift is carried out to discontinuous band signal, so that the discontinuous frequency band letter after the processing of the 3rd frequency spectrum shift
Number each cycle in two parts frequency band frequency deviation it is symmetrical；
3rd low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the 3rd frequency spectrum shift；
The processing of the 4th frequency spectrum shift is carried out to the discontinuous band signal after the 3rd low-pass filtering treatment, so that the 4th frequency spectrum shift
Another part frequency band in a part of frequency band cycle adjacent with the cycle in each cycle of discontinuous band signal after processing
Frequency deviation it is symmetrical；
4th low-pass filtering treatment is carried out to the discontinuous band signal after the processing of the 4th frequency spectrum shift.
5. a kind of signal filtering system, it is characterised in that including：
First frequency spectrum shift processing module, for carrying out the first frequency spectrum shift processing to discontinuous band signal, so that the first frequency
The frequency deviation that spectrum moves two groups of outer end frequency bands in each cycle of the discontinuous band signal after processing is symmetrical；Wherein, the outer end
Frequency band is the frequency band for being located at outermost end in each cycle；
First low-pass filtering treatment module, for carrying out the first low pass to the discontinuous band signal after the processing of the first frequency spectrum shift
Filtering process；
Second frequency spectrum shift processing module, for carrying out some levels the to the discontinuous band signal after the first low-pass filtering treatment
Two frequency spectrum shifts are handled, so that one group of outer end frequency band in each cycle of the discontinuous band signal after the processing of the second frequency spectrum shift
The frequency deviation of one group of nearby frequency bands is symmetrical in the cycle adjacent with the cycle；Wherein, the nearby frequency bands is in each cycles and institute
One group of adjacent frequency band of outer end frequency band is stated, the series of the second frequency spectrum shift processing is equal to the discontinuous band signal intermediate frequency
Band quantity subtracts 1；
Second low-pass filtering treatment module, if for being carried out to the discontinuous band signal after the processing of some frequency spectrum shifts of level second
The dry low-pass filtering treatment of level second；Wherein, the discontinuous band signal after frequency spectrum shift of prime second is handled is carried out current
The second low-pass filtering treatment of level；
3rd frequency spectrum shift processing module, for carrying out the to the discontinuous band signal after some low-pass filtering treatments of level second
Three frequency spectrum shifts processing, so that the discontinuous band signal after the processing of the 3rd frequency spectrum shift recovers to initial spectrum position.
6. system as claimed in claim 5, it is characterised in that when the series of second frequency spectrum shift processing is more than 1, institute
Stating some the second frequency spectrum shift of level processing modules includes：
One-level the second frequency spectrum shift processing module, for carrying out one-level to the discontinuous band signal after the first low-pass filtering treatment
Second frequency spectrum shift processing, so that the discontinuous band signal after the processing of the frequency spectrum shift of one-level second carries out the low pass filtered of one-level second
Ripple processing；
Two grades and the above the second frequency spectrum shift processing module, for the discontinuous frequency band after the low-pass filtering treatment of upper level second
Signal is carried out when the processing of the frequency spectrum shift of prime second, so that the discontinuous band signal after frequency spectrum shift of prime second is handled enters
The low-pass filtering treatment of trade prime second.
7. system as claimed in claim 5, it is characterised in that the series of the second frequency spectrum shift processing is equal to 2, then described
Some the second frequency spectrum shift of level processing modules include：
One-level the second frequency spectrum shift processing module, for carrying out one-level to the discontinuous band signal after the first low-pass filtering treatment
Second frequency spectrum shift is handled, so that in each cycle of the discontinuous band signal after the processing of the frequency spectrum shift of one-level second outside one group
Hold the frequency deviation of one group of nearby frequency bands in the frequency band cycle adjacent with the cycle symmetrical, so that after the processing of the frequency spectrum shift of one-level second
Discontinuous band signal carries out the low-pass filtering treatment of one-level second；
Two grade of second frequency spectrum shift processing module, for being carried out to the discontinuous band signal after the low-pass filtering treatment of one-level second
Two grade of second frequency spectrum shift is handled, so that another in each cycle of the discontinuous band signal after two grade of second frequency spectrum shift processing
The frequency deviation of one group of nearby frequency bands is symmetrical in one group of outer end frequency band cycle adjacent with the cycle, so that at two grade of second frequency spectrum shift
Discontinuous band signal after reason carries out two grade of second low-pass filtering treatment.
8. system as claimed in claim 5, it is characterised in that when the series of second frequency spectrum shift processing is more than 1, institute
Stating system also includes：
Decomposing module, for being two parts frequency band by the band decomposition of discontinuous band signal；
First filters out module, for carrying out two parts frequency band outside according to the signal filtering process for including two groups of frequency bands and being somebody's turn to do
Spurious signal between two parts frequency band is filtered out；
Second filters out module, for carrying out filtering out for every partial-band internal stray signal respectively；
Wherein, described first filter out module and include：
3rd frequency spectrum shift processing module, for carrying out the processing of the 3rd frequency spectrum shift to discontinuous band signal, so that the 3rd frequency
The frequency deviation that spectrum moves two parts frequency band in each cycle of the discontinuous band signal after processing is symmetrical；
3rd low-pass filtering treatment module, for carrying out the 3rd low pass to the discontinuous band signal after the processing of the 3rd frequency spectrum shift
Filtering process；
4th frequency spectrum shift processing module, for carrying out the 4th frequency spectrum to the discontinuous band signal after the 3rd low-pass filtering treatment
Processing is moved, so that a part of frequency band and the cycle in each cycle of the discontinuous band signal after the processing of the 4th frequency spectrum shift
The frequency deviation of another part frequency band is symmetrical in the adjacent cycle；And
4th low-pass filtering treatment module, for carrying out the 4th low pass to the discontinuous band signal after the processing of the 4th frequency spectrum shift
Filtering process.
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