CN106487403A - A kind of adaptive filter method and device - Google Patents
A kind of adaptive filter method and device Download PDFInfo
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- CN106487403A CN106487403A CN201510540500.9A CN201510540500A CN106487403A CN 106487403 A CN106487403 A CN 106487403A CN 201510540500 A CN201510540500 A CN 201510540500A CN 106487403 A CN106487403 A CN 106487403A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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Abstract
The invention discloses a kind of adaptive filter method and device.The method of described adaptive-filtering includes：Obtain the interference ratio of the wideband digital signal of pending Filtering Processing；Filtering performance is arranged with this interference than the channel filtering pattern mated according to described interference ratio；Channel filtering is carried out to described wideband digital signal using described channel filtering pattern.The device of described adaptive-filtering is corresponding with the method for described adaptive-filtering.The method and apparatus of this adaptive-filtering solves the problems, such as that trade-off of performance under different inband signalings and adjacent frequency interference scene for the fixed channel wave filter, filter effect be not good well, makes signal filtering effect more preferable.
Description
Technical field
The present invention relates to wireless communication field, more particularly, to a kind of adaptive filter method and device.
Background technology
In a wireless communication system, the generation of air interference is diversified, and generally, active equipment is being sent out
While penetrating useful signal, due to due to device itself and wave filter Out-of-band rejection restriction, in its work
Make to produce the garbage signals such as spuious, harmonic wave, intermodulation outside frequency band, these signals fall other wireless systems
In working band, interference will be formed to it, generally include adjacent frequency interference and co-channel interference.
Narrow-band communication system, such as GSM (Global System for Mobile Communication) are same
In one cell, will not configure adjacent carrier wave (during a cell configuration adjacent carrier, can using frequency hopping Lai
Solve interfering of adjacent frequency).Wide-band communication system, such as E-UTRAN (Evolved Universal
Terrestrial Radio Access Network) 20M carrier bandwidths, in fact wanted carrier only account for
18MHz bandwidth, both sides each 1MHz bandwidth is used for the insulation blocking of intercarrier, reduces inter-carrier interference.
As a same reason, between different radio standard also carrier wave to be considered protection interval.Because frequency spectrum resource has
Limit, in order to improve the availability of frequency spectrum, usually can reduce the protection interval of intercarrier, lead to adjacent frequency interference
Situation.It is possible to there is the interference of adjacent frequency between such as adjacent cell.Band separation fall between different systems
Low.Particularly with base station receiver, because user equipment (UE, User Equipment) receives to base station
The signal level range of machine is very big, and adjacent frequency interference may be very serious, can have a strong impact on receptivity.
In prior art, for all of interference scene of carrier wave, channel model use one relatively solid
Fixed filter patterns are filtered to carrier data, filter out-of-band interference.Because channel model is realized
Limit and consider it is necessary to carry out compromise between the index such as ripple, Out-of-band rejection, intermediate zone width in band.Letter
The filter patterns that channel filter adopts are fixed, and in its passband, performance and Out-of-band rejection performance are namely fixing,
The performance of channel model is the result of compromise, inevitably results in and can not accomplish to filter under all interference scenes
Best performance.For example, in low adjacent frequency interference scene, the channel model of fixing filter patterns can be to useful load
The ripple loss of signal more it is impossible to obtain best receptivity.In high adjacent frequency interference scene, fixing filtering mould
The suppression that the wave filter of formula disturbs to adjacent frequency not, nor obtains higher receptivity.
Content of the invention
The main technical problem to be solved in the present invention is to provide a kind of adaptive filter method and device, solves
Existing channel wave filter is directed to different interference scenes and leads to the bad problem of filtering performance using fixing filter patterns.
For solving above-mentioned technical problem, the invention discloses a kind of adaptive filter method, described self adaptation filter
Wave method includes：Obtain the interference ratio of the wideband digital signal of pending Filtering Processing；According to described interference ratio
Setting filtering performance is with this interference than the channel filtering pattern mated；Using described channel filtering pattern to described
Wideband digital signal carries out channel filtering.
In an embodiment of the present invention, the interference ratio obtaining described wideband digital signal includes：From described
At least one section is intercepted as sample wideband digital signal in wideband digital signal；Extract described sample wideband digital
The inband signaling of signal and interference signal；Calculate the power of described inband signaling and the power of described interference signal,
The ratio of the power of described inband signaling and the power of described interference signal is compared as interference.
In an embodiment of the present invention, described interference ratio includes adjacent frequency interference ratio.
In an embodiment of the present invention, mated with this interference ratio than setting filtering performance according to described interference
Channel filtering pattern include：The interference of described adjacent frequency is compared than threshold value than with the interference of default adjacent frequency, root
Determine the adjacent frequency interference channel filter patterns that filtering performance is mated with this adjacent frequency interference ratio according to comparative result.
In an embodiment of the present invention, described default adjacent frequency interference includes the first default adjacent frequency than threshold value and does
Disturb and compare threshold value than threshold value and the second default adjacent frequency interference；Described filtering performance and this neighbour are determined according to comparative result
Frequency interference includes than the channel filtering pattern of coupling：When adjacent frequency is preset in the interference of described adjacent frequency than less than described first
When interference is than threshold value, setting filtering performance is the channel filtering pattern of high out-of-side rejection performance；When described adjacent frequency
Than more than or equal to described first, default adjacent frequency is disturbed than threshold value and default adjacent frequency is done less than or equal to described second for interference
Disturb than threshold value when, setting filtering performance be Out-of-band rejection performance in middle band-pass behavior channel filtering pattern；When
When described adjacent frequency interference presets adjacent frequency interference than threshold value than more than described second, setting filtering performance is upper passband
The channel filtering pattern of performance.
The present invention also provides a kind of adaptive filter device, and described adaptive filter device includes：Interference ratio obtains
Take unit, filter patterns arranging unit and channel filtering unit；Described interference is treated for acquisition than acquiring unit
It is filtered the interference ratio of the wideband digital signal of process；Described filter patterns arranging unit is used for according to described
Interference ratio arranges filtering performance with this interference than the channel filtering pattern mated；Described channel filtering unit is used for
Channel filtering is carried out to described wideband digital signal using described channel filtering pattern.
In an embodiment of the present invention, described interference includes than acquiring unit：Signal processing module and dry
Disturb and compare computing module；Described signal processing module is used for intercepting at least one section work from described wideband digital signal
For sample wideband digital signal；Described interference is used for extracting described sample wideband digital signal than computing module
Inband signaling and interference signal, calculate the power of described inband signaling and the power of described interference signal, by institute
State the power of inband signaling with the ratio of the power of described interference signal as interference ratio.
In an embodiment of the present invention, described interference includes adjacent frequency interference signal process mould than computing module
Block, described interference is compared than including adjacent frequency interference；Described adjacent frequency interference signal processing module is used for extracting described sample
The inband signaling of this wideband digital signal and adjacent frequency interference signal, calculate the power of described inband signaling and described
The power of adjacent frequency interference signal, by the ratio of the power of described inband signaling and the power of described adjacent frequency interference signal
Value disturbs ratio as adjacent frequency.
In an embodiment of the present invention, described filter patterns arranging unit also includes adjacent frequency interference filter and sets
Put module, described adjacent frequency interference filter setup module is used for for the interference of described adjacent frequency disturbing ratio than with default adjacent frequency
Threshold value is compared, and determines that filtering performance is believed than the adjacent frequency interference mated with the interference of this adjacent frequency according to comparative result
Road filter patterns.
In an embodiment of the present invention, described default adjacent frequency interference includes the first default adjacent frequency than threshold value and does
Disturb and compare threshold value than threshold value and the second default adjacent frequency interference；Described adjacent frequency interference filter setting subelement is according to comparing
Result determines that filtering performance is included than the channel filtering pattern mated with the interference of this adjacent frequency：When comparative result is institute
When stating adjacent frequency interference default adjacent frequency interference is than threshold value than less than described first, setting filtering performance is to press down outside high band
The channel filtering pattern of performance processed；When comparative result is more default than more than or equal to described first for the interference of described adjacent frequency
When adjacent frequency interference is than threshold value, when default adjacent frequency interference is than threshold value less than or equal to described second, filtering performance is set
Channel filtering pattern for Out-of-band rejection performance in middle band-pass behavior；When comparative result disturbs ratio for described adjacent frequency
When more than described second, default adjacent frequency interference is than threshold value, setting filtering performance is the channel filtering of upper passband performance
Pattern.
The invention has the beneficial effects as follows：
The present invention provides a kind of adaptive filter method and device, and the wideband digital signal obtaining is being filtered
Before ripple, first get the interference ratio of this wideband digital signal, namely first get this wideband digital signal
Disturbed condition, and then mated than setting filtering performance and this interference ratio according to the interference of this wideband digital signal
Channel filtering pattern, is then just filtered to this wideband digital signal based on the channel filtering pattern of real-time setting
Ripple.It can be seen that, the present invention, can be according to contemporary broadband number before the wideband digital signal obtaining is filtered
The current interference of word signal than situation for one filtering performance of its real-time matching adaptation the most filter patterns,
I.e. according to the signal disturbed condition of current process to be filtered be its adaptive match optimal filter patterns,
It is not to be used uniformly across with the fixing filter patterns of performance compromise, it simply being filtered as existing, relatively
Existing filtering mode can obtain more preferable filtering performance.
Brief description
Fig. 1 is the schematic flow sheet that wideband digital signal is filtered in the embodiment of the present invention one；
Fig. 2 is the schematic flow sheet of the acquisition interference ratio in the embodiment of the present invention one；
Fig. 3 is the broadband receiver system block diagram in the embodiment of the present invention two；
Fig. 4 is the adaptive filter device structural representation in the embodiment of the present invention two；
Fig. 5 is another adaptive filter device structural representation in the embodiment of the present invention two；
Fig. 6 is the adaptive filter device structural representation in the embodiment of the present invention three when interference is disturbed for adjacent frequency
Figure.
Specific embodiment
Combine accompanying drawing below by specific embodiment the present invention is described in further detail.
Embodiment one：
It should be appreciated that the adaptive filter method that the present embodiment provides applies to various application scenarios,
It is particularly suited for the process to the wireless signal receiving for the broadband receiver.Below with the application of broadband receiver
Property explanation as an example.
The basic procedure of broadband receiver reception processing signal is to receive radiofrequency signal, carries out analog digital conversion to it
Obtain wideband digital signal, then the wideband digital signal obtaining is carried out with channel filtering etc. and processes, counted
Word baseband signal, then carries out to it receiving the process such as demodulating and decoding.The present embodiment is then mainly to above-mentioned process
Channel filtering processing links in flow process propose and can obtain the optimal filtering mode of filtering performance, below example
It is described as follows：
The present embodiment, after the wideband digital signal obtaining, is not to carry out channel filtering process to it at once,
But first obtaining the disturbed condition of this wideband digital signal, the present embodiment preferably disturbs feelings to disturb than characterizing it
Condition, the filter patterns being then its real-time setting filtering performance coupling the most according to the disturbed condition obtaining, so
The corresponding channel model of relief is filtered to this wideband digital signal using this filter patterns.Above-mentioned it is
During wideband digital signal setting filter patterns, delay process can be carried out to the wideband digital signal obtaining,
Complete the setting of above-mentioned filter patterns in time delay, the concrete time value of this time delay can be according to completing above-mentioned filter
The setting up procedure required time of wave mode and set.The process of adaptive-filtering is shown in Figure 1, including：
Step 101：Obtain the wideband digital signal interference ratio of process to be filtered；
Step 102：Filtering performance is arranged with this interference than the channel filtering pattern mated according to described interference ratio；
Step 103：Channel filtering is carried out to wideband digital signal using the channel filtering pattern setting.
It is understood that, the adjacent frequency disturbed condition that the channel filtering in the present embodiment can be directed to signal is carried out
Filtering, is but not limited only to be filtered for the adjacent frequency disturbed condition of signal.
In the present embodiment, disturb ratio for adjacent frequency, can obtain in the following ways, specifically refer to Fig. 2 institute
Show, including：
Step 201：Intercept at least one section as sample wideband digital signal from wideband digital signal；
The quantity that this step intercepts can be according to concrete application scene (requirement for example to precision and to filtering
Process the factors such as the requirement of real-time) specifically flexibly select, a section of preset length can be intercepted the cycle, only
Want the disturbed condition of its energy this wideband digital signal of Efficient Characterization, the alternatively cycle intercepts two sections or three sections
More than, more accurately to characterize its disturbed condition, the setting for subsequent interference pattern provides more preferable foundation,
The signal of whole cycle can also directly be intercepted, accurately to characterize disturbed condition.
Step 202：Extract inband signaling and the adjacent frequency interference signal of sample wideband digital signal；
Extracting mode for inband signaling and adjacent frequency interference signal can be extracted using corresponding wave filter,
Can be extracted using other any effective means；
Step 203：Calculate the power of inband signaling and the power of adjacent frequency interference signal, by the power of inband signaling
Disturb ratio with the ratio of the power of adjacent frequency interference signal as adjacent frequency.
Obtain adjacent frequency interference than after, in above-mentioned steps 102 can by the adjacent frequency obtaining interference than with corresponding
Adjacent frequency interference is compared than threshold value, thus arranging filtering performance and this adjacent frequency interference ratio according to comparative result
The channel filtering pattern joined.
Disturb in the present embodiment and can flexibly arrange according to demand than the number of threshold value setting, for example, may be configured as
One, interference scene is carried out with a thick division of comparison it is also possible to be set to multiple, with to interference scene
Carry out a more accurate subdivision, below the present embodiment be set to two with default adjacent frequency interference than threshold value and be
Example is illustrated.The default adjacent frequency interference now arranging includes the first default adjacent frequency interference than threshold value and compares threshold
(the second default adjacent frequency interference is more than the first default adjacent frequency than threshold value and does than threshold value for value and the second default adjacent frequency interference
Disturb than threshold value), the adjacent frequency obtaining interference is set adjacent frequency interference than threshold value and the second default adjacent frequency than with default by first
Interference is compared than threshold value, arranges corresponding channel filtering pattern according to comparative result, specific as follows：
When comparative result presets adjacent frequency interference than threshold value for adjacent frequency interference than less than first, now show that band is outer
Adjacent frequency interference is relatively strong, is high adjacent frequency interference scene, need to strengthen Out-of-band rejection, and therefore setting filtering performance is height
The channel filtering pattern of Out-of-band rejection performance；
When comparative result, for adjacent frequency interference, than more than or equal to first, default adjacent frequency disturbs ratio threshold value, and is less than or equal to
When second default adjacent frequency interference is than threshold value, now show to carry outer adjacent frequency disturbed condition general, therefore setting filtering
Performance is the channel filtering pattern of Out-of-band rejection performance in middle band-pass behavior；
When comparative result presets adjacent frequency interference than threshold value for adjacent frequency interference than more than second, now show that band is outer
Adjacent frequency interference is weaker, is low adjacent frequency interference scene, need to ensure that enough band-pass behavior reduce useful load as far as possible
The ripple loss of signal, therefore setting filtering performance are the channel filtering pattern of upper passband performance.
It should be appreciated that the channel filtering pattern in the present embodiment be primarily directed to different filtering performances and
Speech, namely corresponding filter coefficient is carried out with corresponding adjustment setting to meet different filtering performances, and
Different filtering performances then corresponds to different filter patterns.
Embodiment two：
The present invention will be further described for the present embodiment combining adaptive filter.Adaptive in the present embodiment
Answer filter to can be used for various application scenarios, be particularly suited for broadband receiver to the wireless communication receiving
Number process.Below with the application of broadband receiver property explanation as an example.Shown in Figure 3, this figure
It show the structural representation of broadband receiver, it includes antenna 11, radio-frequency channel 12, ADC
(Analog-to-Digital Converter, analog digital conversion) module 13, data intermediate frequency module 14 and base
Carry module 15, its signal processing is：
Radio-frequency channel 12 receives radiofrequency signal by antenna 11 and it is simulated with filtering, amplification, frequency
Move, obtain analog intermediate frequency or baseband signal, ADC 13 carries out mould to analog intermediate frequency or baseband signal
Number conversion, obtains wideband digital intermediate-freuqncy signal, is supplied to data intermediate frequency module 14.Data intermediate frequency module 14 is right
Wideband digital intermediate-freuqncy signal carries out channel filtering etc. and processes the digital baseband signal obtaining carrier wave, for baseband module
15 carry out receiving the process such as demodulating and decoding.The present embodiment then mainly to the channel filtering in above-mentioned handling process at
Reason link proposes and can obtain the optimal filter of filtering performance, illustrates as follows below：
The present embodiment, after obtaining wideband digital signal, is not to carry out channel filtering process to it at once,
But first obtaining the disturbed condition of this wideband digital signal, the present embodiment preferably disturbs feelings to disturb than characterizing it
Condition, the filter patterns being then its real-time setting filtering performance coupling the most according to the disturbed condition obtaining, so
The corresponding channel model of relief is filtered to this wideband digital signal using this filter patterns.Above-mentioned it is
During wideband digital signal setting filter patterns, the wideband digital signal obtaining can be entered by delay unit
Line delay is processed, and completes the setting of above-mentioned filter patterns, the concrete time value of this time delay can root in time delay
Set according to the setting up procedure required time completing above-mentioned filter patterns.The device completing this filtering please
Shown in Figure 4, including：Interference is than acquiring unit 21, filter patterns arranging unit 22, channel filtering list
Unit 23 and delay unit 24 are it should be appreciated that interference is used for obtaining at pending filtering than acquiring unit 21
The interference ratio of the wideband digital signal of reason；Filter patterns arranging unit 22 is used for arranging this wideband digital signal
Channel filtering pattern；Channel filtering unit 23 is used for using described channel filtering pattern, described wideband digital being believed
Number carry out channel filtering；Delay unit 24 is used for carrying out delay process to the wideband digital signal obtaining, and is prolonging
When in complete the setting of above-mentioned filter patterns, the concrete time value of this delay unit can be according to completing above-mentioned filter
The setting up procedure required time of wave mode and set.
It is understood that, the adjacent frequency disturbed condition that the channel filtering in the present embodiment can be directed to signal is carried out
Filtering, is but not limited only to be filtered for the adjacent frequency disturbed condition of signal.
In the present embodiment, interference also includes signal processing module and interference ratio computing module than acquiring unit 21,
Refer to Fig. 5, signal processing module 211 is used for intercepting at least one section from described wideband digital signal as sample
This wideband digital signal；It should be understood that the quantity intercepting can be according to concrete application scene (for example to essence
The factor such as the requirement of degree and the requirement to Filtering Processing real-time) specifically flexibly select, can intercept in the cycle
One section of preset length, as long as the disturbed condition of its energy this wideband digital signal of Efficient Characterization, alternatively
Cycle intercepts two sections or more than three sections, more accurately to characterize its disturbed condition, is setting of subsequent interference pattern
Put and provide preferably according to it is also possible to directly intercept the signal of whole cycle, so that accurate characterize interference feelings
Condition.Interference is used for extracting inband signaling and the interference signal of sample wideband digital signal than computing module 212,
Calculate the power of inband signaling and the power of interference signal, by the power of described inband signaling and described interference letter
Number power ratio as interference ratio.
Interference in the present embodiment includes adjacent frequency interference signal processing module, described interference than computing module 212
Disturb ratio than for adjacent frequency；Adjacent frequency interference signal processing module is used for extracting the interior letter of band of sample wideband digital signal
Number and adjacent frequency interference signal, calculate the power of described inband signaling and the power of described adjacent frequency interference signal, will
The power of described inband signaling disturbs ratio with the ratio of the power of described adjacent frequency interference signal as adjacent frequency.
Filter patterns arranging unit 22 in the present embodiment also includes adjacent frequency interference filter arranging unit, described neighbour
Frequency interference filter arranging unit be used for described interference than includes adjacent frequency interference than when, by described adjacent frequency interference ratio with
Default adjacent frequency interference is compared than threshold value, determines filtering performance and this adjacent frequency interference ratio according to comparative result
The adjacent frequency interference channel filter patterns joined.
Interference in the present embodiment can the demand of basis flexibly be arranged than the number of threshold value setting, for example, can set
It is set to one, interference scene is carried out with a thick division of comparison it is also possible to be set to multiple, with to interference
Scene carries out a more accurate subdivision.The present embodiment is set to two with default adjacent frequency interference than threshold value below
Illustrated as a example individual.The default adjacent frequency interference now arranging includes the first default adjacent frequency interference than threshold value
Than threshold value and the second default adjacent frequency interference, than threshold value, (the second default adjacent frequency interference is more than the first default neighbour than threshold value
Frequency interference is than threshold value), when comparative result, for the interference of described adjacent frequency, than less than described first, threshold is compared in default adjacent frequency interference
During value, setting filtering performance is the channel filtering pattern of high out-of-side rejection performance；When comparative result is described neighbour
When frequency interference presets adjacent frequency interference than threshold value than more than or equal to described first, the default neighbour less than or equal to described second
When frequency interference is than threshold value, setting filtering performance is the channel filtering pattern of Out-of-band rejection performance in middle band-pass behavior；
When comparative result presets adjacent frequency interference than threshold value for the interference of described adjacent frequency than more than described second, setting filtering
Performance is the channel filtering pattern of upper passband performance.
Channel filtering unit in the present embodiment includes the wave filter for filtering, and described channel filtering unit is extremely
It is provided with the adjustable wave filter of filtering parameter less, or the wave filter that multiple filtering parameter is different.Refer to
Fig. 5, described channel filtering unit 23 is provided with the adjustable wave filter 231 of filter coefficient, for not
Same filtering performance, corresponding adjustment setting filtering parameter, preferably enters for different wideband digital signals
Row filtering.
Refer to Fig. 6, in the present embodiment, interference is also wrapped than acquiring unit 61 for adjacent frequency interference than acquiring unit
Include signal processing module 611 and adjacent frequency interference ratio computing module 612, signal processing module 611 is used for from described
At least one section is intercepted as sample wideband digital signal in wideband digital signal；It should be understood that the number intercepting
Amount can be according to concrete application scene (requirement for example to precision and the requirement to Filtering Processing real-time etc.
Factor) specifically flexibly select, a section of preset length can be intercepted the cycle, as long as it can this width of Efficient Characterization
With the disturbed condition of digital signal, the alternatively cycle intercepts two sections or more than three sections, with more accurate table
Levy its disturbed condition, the setting for subsequent interference pattern is provided preferably according to it is also possible to directly intercept whole
The signal in cycle, accurately to characterize disturbed condition.Described adjacent frequency interference is used for carrying than computing module 612
Take inband signaling and the adjacent frequency interference signal of described sample wideband digital signal, calculate the work(of described inband signaling
Rate and the power of described adjacent frequency interference signal, by the power of described inband signaling and described adjacent frequency interference signal
The ratio of power disturbs ratio as adjacent frequency.Described adjacent frequency interference is used for extracting described sample than computing module 612
The inband signaling of wideband digital signal and adjacent frequency interference signal are specially：Described adjacent frequency is disturbed than computing module 612
Including the first low pass filter, for extracting the inband signaling of described sample wideband digital signal, described adjacent frequency
Interference includes the second low pass filter or the first band filter (not shown) than computing module 612, uses
In extracting the left adjacent frequency interference signal after described sample wideband digital signal intermediate frequency spectrum moves to right, described adjacent frequency is disturbed
Include the 3rd low pass filter or the second band filter (not shown) than computing module 612, be used for carrying
Right adjacent frequency interference signal after taking described sample wideband digital signal intermediate frequency spectrum to move to left.
Filter patterns arranging unit 62 in the present embodiment, also includes adjacent frequency interference filter setup module 621,
Described adjacent frequency interference filter arranging unit 621 be used for described interference than includes adjacent frequency disturb than when, by described neighbour
Frequency interference is compared than threshold value than with the interference of default adjacent frequency, determines filtering performance and this neighbour according to comparative result
Frequency interference is than the adjacent frequency interference channel filter patterns of coupling；
Adjacent frequency interference in the present embodiment can the demand of basis flexibly be arranged than the number of threshold value setting, for example
May be configured as one, interference scene is carried out with a thick division of comparison it is also possible to be set to multiple, with right
Interference scene carries out a more accurate subdivision.Default described in described adjacent frequency interference filter setting subelement
Adjacent frequency interference is compared with described adjacent frequency interference ratio than threshold value, determines filtering performance and this neighbour according to comparative result
The setting up procedure of the channel filtering pattern than coupling for the frequency interference is described in detail；Adjacent frequency interference ratio in this example
When threshold value is provided with two, specific is to be provided with the first adjacent FM channel interference to disturb ratio threshold value than threshold value and the second adjacent frequency,
Described second adjacent frequency interference is more than described the first adjacent FM channel interference than threshold value and compares threshold value.When comparative result is described neighbour
When frequency interference presets adjacent frequency interference than threshold value than less than described first, setting filtering performance is high out-of-side rejection
The channel filtering pattern of energy；When comparative result presets adjacent frequency for the interference of described adjacent frequency than more than or equal to described first
When interference is than threshold value, when less than or equal to described second, default adjacent frequency interference is than threshold value, during setting filtering performance is
The channel filtering pattern of Out-of-band rejection performance in band-pass behavior；When comparative result is more than for described adjacent frequency interference ratio
When described second default adjacent frequency interference is than threshold value, setting filtering performance is the channel filtering pattern of upper passband performance.
Channel filtering unit in the present embodiment includes the wave filter for filtering, and described channel filtering unit is extremely
It is provided with the adjustable wave filter of filtering parameter less, or the wave filter that multiple filtering parameter is different.Refer to
Fig. 5, described channel filtering unit 23 is provided with the adjustable wave filter 231 of filter coefficient, for not
Same filtering performance, corresponding adjustment setting filtering parameter, preferably for different wideband digital signals
It is filtered.
Above content is to further describe it is impossible to recognize with reference to specific embodiment is made for the present invention
Determine the present invention be embodied as be confined to these explanations.Ordinary skill for the technical field of the invention
For personnel, without departing from the inventive concept of the premise, some simple deduction or replace can also be made,
Protection scope of the present invention all should be considered as belonging to.
Claims (10)
1. a kind of adaptive filter method is it is characterised in that include：
Obtain the interference ratio of the wideband digital signal of pending Filtering Processing；
Filtering performance is arranged with this interference than the channel filtering pattern mated according to described interference ratio；
Channel filtering is carried out to described wideband digital signal using described channel filtering pattern.
2. adaptive filter method as claimed in claim 1 is it is characterised in that obtain described wideband digital
The interference of signal is than inclusion：
Intercept at least one section as sample wideband digital signal from described wideband digital signal；
Extract inband signaling and the interference signal of described sample wideband digital signal；
Calculate the power of described inband signaling and the power of described interference signal, by the power of described inband signaling
Compare as interference with the ratio of the power of described interference signal.
3. adaptive filter method as claimed in claim 2 is it is characterised in that described interference ratio includes neighbour
Frequency interference ratio.
4. adaptive filter method as claimed in claim 3, described setting according to described interference ratio filters property
Can include than the channel filtering pattern mated with described interference：
The interference of described adjacent frequency is compared than threshold value than with the interference of default adjacent frequency, filter is determined according to comparative result
Ripple performance is with the interference of this adjacent frequency than the adjacent frequency interference channel filter patterns mating.
5. adaptive filter method as claimed in claim 4 is it is characterised in that described default adjacent frequency is disturbed
Include the first default adjacent frequency interference than threshold value and compare threshold value than threshold value and the second default adjacent frequency interference；
Described determine the interference of filtering performance and this adjacent frequency than the channel filtering pattern bag mating according to comparative result
Include：
When default adjacent frequency interference is than threshold value than less than described first for the interference of described adjacent frequency, setting filtering performance is
The channel filtering pattern of high out-of-side rejection performance；
When the interference of described adjacent frequency, than more than or equal to described first, default adjacent frequency interference than threshold value and is less than or equal to described
When second default adjacent frequency interference is than threshold value, setting filtering performance is the letter of Out-of-band rejection performance in middle band-pass behavior
Road filter patterns；
When default adjacent frequency interference is than threshold value than more than described second for the interference of described adjacent frequency, setting filtering performance is
The channel filtering pattern of upper passband performance.
6. a kind of adaptive filter device is it is characterised in that include：Interference ratio acquiring unit, filter patterns
Arranging unit and channel filtering unit；
Described interference is used for than acquiring unit obtaining the interference ratio of the wideband digital signal of pending Filtering Processing；
Described filter patterns arranging unit is used for being mated with this interference ratio than setting filtering performance according to described interference
Channel filtering pattern；
Described channel filtering unit is used for carrying out letter using described channel filtering pattern to described wideband digital signal
Road filters.
7. the device of adaptive-filtering as claimed in claim 6 is it is characterised in that described interference is than acquisition
Unit includes：Computing module is compared in signal processing module and interference；
Described signal processing module is used for intercepting at least one section from described wideband digital signal as sample broadband
Digital signal；
Described interference is used for extracting the inband signaling of described sample wideband digital signal and interference letter than computing module
Number, calculate the power of described inband signaling and the power of described interference signal, by the power of described inband signaling
Compare as interference with the ratio of the power of described interference signal.
8. the device of adaptive-filtering as claimed in claim 7 is it is characterised in that described interference is than calculating
Module includes adjacent frequency interference signal processing module, and described interference is compared than including adjacent frequency interference；Described adjacent frequency interference
Signal processing module is used for extracting inband signaling and the adjacent frequency interference signal of described sample wideband digital signal, meter
Calculate the power of described inband signaling and the power of described adjacent frequency interference signal, by the power of described inband signaling with
The ratio of the power of described adjacent frequency interference signal disturbs ratio as adjacent frequency.
9. adaptive filter device as claimed in claim 8 is it is characterised in that described filter patterns are arranged
Unit also includes adjacent frequency interference filter setup module, and described adjacent frequency interference filter setup module is used for described neighbour
Frequency interference is compared than threshold value than with the interference of default adjacent frequency, determines filtering performance and this neighbour according to comparative result
Frequency interference is than the adjacent frequency interference channel filter patterns of coupling.
10. the adaptive filter device based on scene as claimed in claim 9 is it is characterised in that described pre-
If adjacent frequency interference includes the first default adjacent frequency interference than threshold value and compares threshold value than threshold value and the second default adjacent frequency interference；
According to comparative result, described adjacent frequency interference filter setting subelement determines that filtering performance is mated with this adjacent frequency interference ratio
Channel filtering pattern include：
When comparative result presets adjacent frequency interference than threshold value for the interference of described adjacent frequency than less than described first, setting
Filtering performance is the channel filtering pattern of high out-of-side rejection performance；
When comparative result presets adjacent frequency interference than threshold value for the interference of described adjacent frequency than more than or equal to described first,
When less than or equal to described second, default adjacent frequency interference is than threshold value, setting filtering performance is that in middle band-pass behavior, band is outer
The channel filtering pattern of rejection；
When comparative result presets adjacent frequency interference than threshold value for the interference of described adjacent frequency than more than described second, setting
Filtering performance is the channel filtering pattern of upper passband performance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510540500.9A CN106487403A (en) | 2015-08-28 | 2015-08-28 | A kind of adaptive filter method and device |
| PCT/CN2016/081167 WO2017036161A1 (en) | 2015-08-28 | 2016-05-05 | Self-adaptive filtering method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510540500.9A CN106487403A (en) | 2015-08-28 | 2015-08-28 | A kind of adaptive filter method and device |
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| CN106487403A true CN106487403A (en) | 2017-03-08 |
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| CN201510540500.9A Withdrawn CN106487403A (en) | 2015-08-28 | 2015-08-28 | A kind of adaptive filter method and device |
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| CN (1) | CN106487403A (en) |
| WO (1) | WO2017036161A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0578007A1 (en) * | 1992-07-08 | 1994-01-12 | Blaupunkt-Werke GmbH | Circuit arrangement for the recognition and suppression of adjacent channel interferece |
| US5493717A (en) * | 1993-06-11 | 1996-02-20 | Blaupunkt-Werke Gmbh | Adjacent channel interference detection & suppression circuit |
| CN1288609A (en) * | 1998-01-08 | 2001-03-21 | 艾利森公司 | Method and apparatus for combating adjacent channel interference using multiple IF filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8331493B2 (en) * | 2010-09-03 | 2012-12-11 | Nokia Corporation | Bias removal of radio link quality estimates |
-
2015
- 2015-08-28 CN CN201510540500.9A patent/CN106487403A/en not_active Withdrawn
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2016
- 2016-05-05 WO PCT/CN2016/081167 patent/WO2017036161A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0578007A1 (en) * | 1992-07-08 | 1994-01-12 | Blaupunkt-Werke GmbH | Circuit arrangement for the recognition and suppression of adjacent channel interferece |
| US5493717A (en) * | 1993-06-11 | 1996-02-20 | Blaupunkt-Werke Gmbh | Adjacent channel interference detection & suppression circuit |
| CN1288609A (en) * | 1998-01-08 | 2001-03-21 | 艾利森公司 | Method and apparatus for combating adjacent channel interference using multiple IF filter |
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| WO2017036161A1 (en) | 2017-03-09 |
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