CN102104391B - Intermediate-frequency filtering device and method - Google Patents
Intermediate-frequency filtering device and method Download PDFInfo
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- CN102104391B CN102104391B CN200910261642.6A CN200910261642A CN102104391B CN 102104391 B CN102104391 B CN 102104391B CN 200910261642 A CN200910261642 A CN 200910261642A CN 102104391 B CN102104391 B CN 102104391B
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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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/001—Channel filtering, i.e. selecting a frequency channel within the SDR system
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Abstract
The invention discloses an intermediate-frequency filtering device and method. The intermediate-frequency filtering device comprises an intermediate-frequency filter and is characterized by comprising a filtering coefficient storage and a coefficient selection and control unit which are connected; the output end of the coefficient selection and control unit is connected with the intermediate-frequency filter; the filtering coefficient storage is used for storing filtering coefficients of the intermediate-frequency filter under the different communication modes; the coefficient selection and control unit is used for extracting the filtering coefficients corresponding to the communication mode under which the intermediate-frequency filter works from the filtering coefficient storage and providing the filtering coefficients for the intermediate-frequency filter; and the intermediate-frequency filter is used for using the filtering coefficients acquired from the coefficient selection and control unit to carry out data filtering processing. The intermediate-frequency filtering device and method provided by the invention are used to save hardware resources required by processing digital intermediate-frequency information in scenes in which multimode, mixed-mode, multi-antenna and multi-carrier modes are supported.
Description
Technical field
The present invention relates to wireless telecommunications, Digital Signal Processing and integrated circuit (IC) design field, especially a kind of intermediate frequency filtering device and filtering method.
Background technology
Software and radio technique (Software Radio, abbreviation SDR) become in recent years a study hotspot of wireless telecommunications, each large equipment manufacturer competitively releases the system based on SDR, traditional network and base station system are in a transition period of succession of the old by the new: 1, the application of the base station architecture of separate type, make baseband processing unit (Base Band Unit, be called for short BBU)--remote radio unit (RRU) (RemoteRadio Unit is called for short RRU) base station architecture progressively becomes main flow.2, base station miniaturization becomes development trend.3, more and more higher to the requirement of the energy consumption of base station and efficiency, and become a key technical index weighing base station.4, the application of SDR technology, can seamlessly transit and evolution 2G, 3G, the 4G communication technology, and the mixed mould base station of even various standards also becomes the important need of operator.Each company also sets up the soft base station platform based on SDR one after another, and the base station architecture of BBU-RRU is as main base station form from now on, and its development trend is: miniaturization, low cost, low-power consumption and multi-mode are compatible.
Development along with SDR technology, the hardware implementation mode of Digital IF Processing (FPGA or ASIC realize) is also risen thereupon, and along with mixing the enhancing of the mould multimode market demand, the pressure of the cost that Digital IF Processing faces, power consumption, chip area is also increasing.Need to process more antenna channels number, need to support larger bandwidth demand, need to support the mixed mould of common mode of various modes to process, all bring hardware to realize the expansion at double of area.
The intermediate frequency process of signal is divided into uplink processing and down link is processed, as shown in Figure 1, the processing procedure of down link is: baseband processing unit output baseband signal, in IF processing unit, through molding filtration, filtering interpolation, mixing, close road, peak clipping (Crest Factor Reduction successively, abbreviation CFR), digital pre-distortion (Digital Pre-distortion, abbreviation DPD) after processing, be sent to after digital-to-analogue conversion device (DAC) completes digital-to-analogue conversion and be sent to RF processing unit; Simultaneously digital pre-distortion (DPD) processing apparatus also according to RF processing unit the feedback signal after analog-to-digital conversion (ADC) carry out predistortion calculating.As shown in Figure 2, the processing procedure of down link is: RF processing unit is inputted IF processing unit by signal, after analog-to-digital conversion (ADC), process Frequency mixing processing in IF processing unit, each carrier separation, carries out respectively obtaining baseband signal and being sent to baseband processing unit after filtering extraction, molding filtration.
As seen from Figure 1, Figure 2, in the uplink downlink of intermediate frequency process, formed filter, interpolation filter, decimation filter are the key operation unit that wherein affects hardware resource.Take molding filtration as example, use the coefficient difference of the formed filter of different communication standard, filter order is also different.Common method for designing is the corresponding a kind of formed filter of every kind of standard, and every kind of formed filter number corresponding to standard is determined by concrete antenna number, carrier number.So in supporting the scheme of multimode and mixed mould, the number of filter will be very large.Multimode mode refers to that same set of hardware circuit can support the single mode of multiple types, and operation when mixed mould mode refers to support multiple types suppose to have N kind single mode standard, can support the mixed mould of M kind standard, and M is greater than 1 integer that is less than N, and M generally gets 2 or 3.
In current implementation, often adopt the method for simple copy to realize more number of antennas, the more support of wide bandwidth and multimode, mixed mould mode demand, simple copy method is implemented as follows: suppose to support that single antenna needs a set of intermediate frequency process digital hardware unit, while supporting two antennas, adopt the intermediate frequency process digital hardware unit that two covers are identical to realize; Suppose to support that 5M bandwidth needs a set of intermediate frequency process digital hardware unit, while supporting 10M bandwidth, adopt the intermediate frequency process digital hardware unit that two covers are identical to realize; While supposing to process single mode standard, need a set of intermediate frequency process digital hardware unit, while supporting mixed mould demand, adopt respectively the digital hardware cell of many covers to process the intermediate frequency process of different mode.
The method of above-mentioned simple copy realizes simple, and operational capability expansion is easy, but brings the significant wastage of hardware resource and chip area, causes the expansion of base station volume, the rising of power consumption, and the waste of producing mouthful cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of intermediate frequency filtering device and filtering method, in supporting multimode, mixed mould, multi-antenna multi-carrier-wave scene, saves the required hardware resource of digital intermediate frequency information processing.
In order to address the above problem, the invention provides a kind of intermediate frequency filtering device, comprise intermediate-frequency filter, comprise connected filter factor memory and coefficient selection and control unit; Described coefficient is selected and the output of control unit is connected with intermediate-frequency filter; Described filter factor memory, for storing the filter factor of described intermediate-frequency filter under different communication standard; Described coefficient is selected and control unit, for extracting the corresponding filter factor of communication standard described intermediate-frequency filter work from described filter factor memory and providing to described intermediate-frequency filter; Described intermediate-frequency filter, carries out data filtering processing for using from the filter factor that coefficient is selected and control unit is known.
Further, above-mentioned intermediate frequency filtering device also has following characteristics:
Described coefficient is selected and control unit; for operating under multimode or mixed mould communication mode at described intermediate frequency filtering device; when described intermediate frequency filtering device communicates standard switching; filter factor corresponding to current communication standard from described filter factor memory fetch goes out to switch, and export described intermediate-frequency filter to.
Further, above-mentioned intermediate frequency filtering device also has following characteristics:
Described intermediate frequency filtering device operating multimode communication mode or mixed mould communication mode comprise N kind single mode standard altogether, and N is more than or equal to 1 integer, if all meet Ci*Ai < F/Ni under each single mode standard, the number of described intermediate-frequency filter is 1; Otherwise the number of intermediate-frequency filter is maximum in the value of Ci*Ai < F/Ni corresponding under each single mode standard the result that rounds up; Wherein, Ci is i the carrier number that communication standard is corresponding, and Ai is i the antenna number that communication standard is corresponding, the working clock frequency that F is intermediate-frequency filter, Ni is the sample frequency of intermediate-frequency filter under i communication standard, and i is more than or equal to 1 and be less than or equal to the integer of N.
Further, above-mentioned intermediate frequency filtering device also has following characteristics:
Described communication standard refers to global system for mobile communications communication standard, CDMA system communication standard, universal mobile telecommunications system communication standard, long evolving system communication standard, TDS-CDMA system communication standard.
Further, above-mentioned intermediate frequency filtering device also has following characteristics:
Described intermediate-frequency filter is with lower one or the combination of any two or the combination of three: formed filter, interpolation filter, decimation filter.
In order to address the above problem, the present invention also provides a kind of intermediate frequency filtering method, comprising: in intermediate frequency filtering device, store the filter factor of intermediate-frequency filter under different communication standard; Described intermediate frequency filtering device runs on multimode or mixed mould communication mode lower time, and the corresponding filter factor of communication standard extracting under described intermediate-frequency filter work carries out data filtering processing.
Further, above-mentioned intermediate frequency filtering method also has following characteristics:
Described intermediate frequency filtering device operates under multi-mode communication mode or mixed mould communication mode, and when described intermediate frequency filtering device communicates standard switching, filter factor corresponding to current communication standard extracting after switching carries out data filtering processing.
Further, above-mentioned intermediate frequency filtering method also has following characteristics:
Described intermediate frequency filtering device operating multimode communication mode or mixed mould communication mode comprise N kind single mode standard altogether, and N is more than or equal to 1 integer, if all meet Ci*Ai < F/Ni under each single mode standard, the number of described intermediate-frequency filter is 1; Otherwise the number of intermediate-frequency filter is maximum in the value of Ci*Ai < F/Ni corresponding under each single mode standard the result that rounds up; Wherein, Ci is i the carrier number that communication standard is corresponding, and Ai is i the antenna number that communication standard is corresponding, the working clock frequency that F is intermediate-frequency filter, Ni is the sample frequency of intermediate-frequency filter under i communication standard, and i is more than or equal to 1 and be less than or equal to the integer of N.
Further, above-mentioned intermediate frequency filtering method also has following characteristics:
Described communication standard refers to global system for mobile communications communication standard, CDMA system communication standard, universal mobile telecommunications system communication standard, long evolving system communication standard, TDS-CDMA system communication standard.
Further, above-mentioned intermediate frequency filtering method also has following characteristics:
Described intermediate-frequency filter is with lower one or the combination of any two or the combination of three: formed filter, interpolation filter, decimation filter.
Intermediate frequency filtering device of the present invention and filtering method can be saved the required hardware resource of digital intermediate frequency information processing in supporting multimode, mixed mould, multi-antenna multi-carrier-wave scene.
Accompanying drawing explanation
Fig. 1 is the processing mode schematic diagram of the down link that in prior art, signal intermediate frequency is processed;
Fig. 2 is the processing mode schematic diagram of the up link that in prior art, signal intermediate frequency is processed;
Fig. 3 is the structure chart of intermediate frequency filtering device in embodiment;
Fig. 4 is filter arithmetic element structure chart.
Embodiment
As shown in Figure 3, intermediate frequency filtering device comprises intermediate-frequency filter, also comprises connected filter factor memory and coefficient selection and control unit; Coefficient is selected and the output of control unit is connected with intermediate-frequency filter.This intermediate-frequency filter is with lower one or the combination of any two or the combination of three: formed filter, interpolation filter, decimation filter;
Filter factor memory, for storing the filter factor of intermediate-frequency filter under different communication standard.This filter factor memory can be an independent storage component part, can be also the combination of a plurality of quantum memory devices.For example, when intermediate-frequency filter is formed filter, can there be a plurality of quantum memory devices, the filter factor of the formed filter of a kind of communication standard of each quantum memory device stores.When intermediate-frequency filter is formed filter and interpolation filter, the filter factor of each quantum memory device stores a kind of communication standard compacted under filter and interpolation filter, or, the filter factor of a kind of filter under all right a kind of communication standard of each quantum memory device stores.
Coefficient is selected and control unit, for extracting the corresponding filter factor of communication standard intermediate-frequency filter work from filter factor memory and providing to intermediate-frequency filter.Concrete, in the situation that intermediate frequency filtering device operates in multi-mode communication mode or mixed mould communication mode, when intermediate frequency filtering device communicates standard switching, filter factor corresponding to current communication standard from filter factor memory fetch goes out to switch, and export intermediate-frequency filter to.When filter factor memory is the combination of a plurality of quantum memory devices, coefficient is selected and control unit extracts the corresponding filter factor of communication standard under intermediate-frequency filter work from corresponding quantum memory device.
Intermediate-frequency filter, carries out data filtering processing for using from the filter factor that described coefficient is selected and control unit is known.
The structure of intermediate-frequency filter as shown in Figure 4, mainly comprises delay unit Z
-1, multiplier and adder.A
0, a
1..., a
nfor filter coefficient, from filter coefficient storage input, x (n) is input data, and y (n) is output data.
The mode of utilizing filter coefficient to store in advance can realize same hardware the filtering of various different systems single mode is shared, different systems can configure respectively different coefficients and realize the support to separately, the collocation method of coefficient is to write filter coefficient corresponding to each standard to filter coefficient storage, the hardware resource waste that the method avoids different systems filter to adopt a plurality of different filters to bring.Utilize filter time-division multiplex technology can further save hardware resource.
When intermediate-frequency filter works in multi-mode communication mode, the working clock frequency of establishing intermediate-frequency filter is F, comprises altogether N kind single mode standard under under this multi-mode communication mode, and input sampling rate is respectively N1, N2 ..., Nn.The multiplexing ratio of can time division multiplexing processing of corresponding various these filters of standard is respectively F/N1, F/N2 ..., F/Nn.If carrier number corresponding to N kind standard is respectively C1, C2 ..., Cn antenna number is respectively A1, A2 ..., An.The demand of the disposal ability of corresponding each standard is respectively C1*A1, C2*A2 ..., Cn*An.If meet C1*A1 < F/N1 simultaneously, C2*A2 < F/N2 ..., Cn*An < F/Nn.Support all single mode standards only to need 1 this intermediate-frequency filter to realize by time division multiplexing, otherwise, the number of this intermediate-frequency filter is C1*A1*N1/F, C2*A2*N2/F, ..., the result that the maximum Ci*Ai*Ni/F in Cn*An*Nn/F (i is the arbitrary value between 1 to n) rounds up.
Intermediate-frequency filter can also work in mixed mould communication mode, the prerequisite that described mixed mould is processed is to process with respect to single mode, the total processing bandwidth of hardware is constant, and former cause single mode is processed the bandwidth enjoyed now by several mixed mould communication mode shared in common, so the total disposal ability of hardware is constant.Under mixed mould mode, time division multiplexing is than complicated many under single mode mode, because relate to the time division multiplexing of several standards, if realized with same filter, need switching filter coefficient, when current a kind of standard finishes in time division multiplexing is processed, the filter coefficient that need switch to lower a kind of standard calculates, therefore adopt filter construction as shown in Figure 3, M kind different systems in the corresponding mixed mould mode of M coefficient memory is set, by coefficient selection and control unit, be responsible for the switching of coefficient memory in time division multiplexing processing procedure and the computational process of controlling filter.Adopt filter to extract common technology, avoid adopting M filter to process respectively the filtering of mixed mould communication mode in M, be equivalent to the coefficient memory of M filter all independently to extract, arithmetic element part at M filter, only retain one of them filter arithmetic element (when 1 filter of needs only just can time division multiplexing processing mixes mould communication mode), and M coefficient memory is retained, in time division multiplexed process, by handoff factor memory, realizes the filtering that each standard is different and process.Thereby saved hardware resource.
Under the mixed mould communication mode of M standard, certain grade of filter, at most only needs M coefficient memory and the individual filter arithmetic element of ceil (Ci*Ai*Ni/F), and ceil is ceiling function.
In said method, filter coefficient storage is extracted common technology can effectively raising mix filter reusing degree under mould mode, greatly reduces hardware resource consumption under mixed mould mode.
The single mode communication standard of supporting in multi-mode communication mode in the present invention or mixed mould communication mode comprises following standard: global system for mobile communications (Global System for Mobile Communications, be called for short GSM) communication standard, code division multiple access system (Code-Division Multiple Access, be called for short CDMA) communication standard, universal mobile telecommunications system (Universal Mobile TelecommunicationsSystem, be called for short UMTS) communication standard, long evolving system (Long Term Evolution, be called for short LTE) 1.4M communication standard, LTE3M communication standard, LTE5M communication standard, LTE10M communication standard, LTE15M communication standard, LTE20M communication standard, TDS-CDMA system (Time Division-Synchronous Code Division Multiple Access, be called for short TD-SCDMA) communication standard.
In order more clearly to set forth the method for the present invention's proposition and the operation principle of hardware unit, below in conjunction with specific embodiment, describe.
With formed filter, be designed to example and describe, other filter design method is similar.
As requested, the input sampling rate of each standard formed filter and filter service condition are as shown in the table:
| Standard | Input sampling rate | Antenna carrier number (descending) | Single mode is multiplexing than 245.76M clock | Filter number |
| GSM | 1.28 | 4*8 | 96 | 1 |
| TD-SCDMA | 1.28 | 4*12 | 96 | 1 |
| LTE1.4M | 1.92 | 4*8 | 64 | 1 |
| CDMA | 1.92 | 4*8 | 64 | 1 |
| UMTS | 3.84 | 4*4 | 32 | 1 |
| LTE3M | 3.84 | 4*4 | 32 | 1 |
| LTE5M | 7.68 | 4*4 | 16 | 1 |
| LTE10M | 15.36 | 4*2 | 8 | 1 |
| LTE15M | 30.72 | 4*1 | 4 | 1 |
| LTE20M | 30.72 | 4*1 | 4 | 1 |
In upper table, antenna carrier number is the maximum carrier number that under single mode standard, 4 antennas are supported, in table, antenna number is that unification is 4, and the multiplexing ratio of single mode is according to the circuit working clock calculation of 245.76M, and wherein each standard input data are I, Q multiplex data.Because each standard single mode is multiplexing as seen from the table, than numerical value, is all more than or equal to and needs antenna carrier number to be processed, so adopt filter time-division multiplex technology can utilize 1 formed filter just can support each standard single mold filtering.Under mixed mould mode, always process bandwidth constant, for example, support the situation of the mixed mould of tri-kinds of standards of GUL to be: GSM standard 2 carrier waves/antenna, UMTS standard 1 carrier wave/antenna and LTE10M standard 1 carrier wave/antenna.During the mixed mould of three standards, still can utilize 1 formed filter to carry out time division multiplexing processing, but now need 3 coefficient memories, store respectively the formed filter coefficient that GSM is corresponding, the formed filter coefficient that the formed filter coefficient that UMTS is corresponding and LTE10M are corresponding.Because GSM standard input sampling rate is minimum in three kinds of standards, by GSM, calculating multiplexing ratio is 96, the processing time of whole filter is divided into 96 equal time slices, and single antenna 2 carrier wave GSM process and need to take 2 segments wherein, and 4 antennas take 8 segments; The input sampling rate of UMTS is 3 times of GSM, and it processes single antenna single carrier need to take 3 time segments, and processing 4 antennas needs 12 time segments altogether; LTE10M input sampling rate is 12 times of GSM, it processes single antenna single carrier need to take 12 time segments, 4 antennas need 48 time segments altogether, so three kinds of total time division multiplexinges of standard are processed, take 68 time segments, still have the processing time of 28 time segments vacant.In three kinds of mixed mould time division multiplexing processing procedures of standard, at first time segment initial time, filter coefficient reads in from coefficient memory 1, filter coefficient corresponding to coefficient memory 1 storage GSM standard, GSM filtering when the 8th time, segment finished has been calculated, now coefficient is switched to from coefficient memory 2 inputs, filter coefficient corresponding to coefficient memory 2 storage UMTS standard, UMTS filtering when the 20th time, segment finished has been calculated, now coefficient is switched to from coefficient memory 3 inputs, filter coefficient corresponding to coefficient memory 3 storage LTE10M standard.Until complete filtering when the 68th the time, segment finished, calculate.In whole time division multiplexed process, by handoff factor memory, realize a shared filter three kinds of standards are completed to molding filtration.Saved hardware resource consumption.The number of coefficient memory is decided by the mixed mould communication standard number of the maximum of required support, and coefficient corresponding to each standard writes coefficient memory in advance according to mixed mould configuring condition.During single mode standard, only need to use wherein 1 coefficient memory, according to single mode configuration, in advance filter coefficient corresponding to this single mode standard be write to coefficient memory.
Method filter joint time division multiplexing, the filter coefficient that the present invention proposes can be equipped with and filter coefficient storage is extracted the largest optimization that the technology such as multiplexing can realize hardware resource.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. an intermediate frequency filtering device, comprises intermediate-frequency filter, it is characterized in that,
Comprise connected filter factor memory and coefficient selection and control unit; Described coefficient is selected and the output of control unit is connected with intermediate-frequency filter;
Described filter factor memory, for storing the filter factor of described intermediate-frequency filter under different communication standard;
Described coefficient is selected and control unit, for extracting the corresponding filter factor of communication standard described intermediate-frequency filter work and provide to described intermediate-frequency filter from described filter factor memory, comprise: at described intermediate frequency filtering device, operate under multimode or mixed mould communication mode, when described intermediate frequency filtering device communicates standard switching, filter factor corresponding to current communication standard from described filter factor memory fetch goes out to switch, and export described intermediate-frequency filter to; Described intermediate frequency filtering device operating multimode communication mode or mixed mould communication mode comprise N kind single mode standard altogether, and N is more than or equal to 1 integer, if all meet Ci*Ai<F/Ni under each single mode standard, the number of described intermediate-frequency filter is 1; Otherwise the number of intermediate-frequency filter is maximum in the value of Ci*Ai*Ni/F corresponding under each single mode standard the result that rounds up; Wherein, Ci is i the carrier number that communication standard is corresponding, and Ai is i the antenna number that communication standard is corresponding, the working clock frequency that F is intermediate-frequency filter, Ni is the sample frequency of intermediate-frequency filter under i communication standard, and i is more than or equal to 1 and be less than or equal to the integer of N;
Described intermediate-frequency filter, carries out data filtering processing for using from the filter factor that coefficient is selected and control unit is known.
2. intermediate frequency filtering device as claimed in claim 1, is characterized in that,
Described communication standard refers to global system for mobile communications communication standard, CDMA system communication standard, universal mobile telecommunications system communication standard, long evolving system communication standard, TDS-CDMA system communication standard.
3. intermediate frequency filtering device as claimed in claim 1, is characterized in that,
Described intermediate-frequency filter is with lower one or the combination of any two or the combination of three: formed filter, interpolation filter, decimation filter.
4. an intermediate frequency filtering method, is characterized in that,
In intermediate frequency filtering device, store the filter factor of intermediate-frequency filter under different communication standard; Described intermediate frequency filtering device runs on multimode or mixed mould communication mode lower time, the corresponding filter factor of communication standard extracting under described intermediate-frequency filter work carries out data filtering processing, comprise: described intermediate frequency filtering device operates under multi-mode communication mode or mixed mould communication mode, when described intermediate frequency filtering device communicates standard switching, filter factor corresponding to current communication standard extracting after switching carries out data filtering processing;
Described intermediate frequency filtering device operating multimode communication mode or mixed mould communication mode comprise N kind single mode standard altogether, and N is more than or equal to 1 integer, if all meet Ci*Ai<F/Ni under each single mode standard, the number of described intermediate-frequency filter is 1; Otherwise the number of intermediate-frequency filter is maximum in the value of Ci*Ai*Ni/F corresponding under each single mode standard the result that rounds up; Wherein, Ci is i the carrier number that communication standard is corresponding, and Ai is i the antenna number that communication standard is corresponding, the working clock frequency that F is intermediate-frequency filter, Ni is the sample frequency of intermediate-frequency filter under i communication standard, and i is more than or equal to 1 and be less than or equal to the integer of N.
5. intermediate frequency filtering method as claimed in claim 4, is characterized in that,
Described communication standard refers to global system for mobile communications communication standard, CDMA system communication standard, universal mobile telecommunications system communication standard, long evolving system communication standard, TDS-CDMA system communication standard.
6. intermediate frequency filtering method as claimed in claim 4, is characterized in that,
Described intermediate-frequency filter is with lower one or the combination of any two or the combination of three: formed filter, interpolation filter, decimation filter.
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| CN200910261642.6A CN102104391B (en) | 2009-12-18 | 2009-12-18 | Intermediate-frequency filtering device and method |
| PCT/CN2010/075011 WO2010149114A1 (en) | 2009-12-18 | 2010-07-06 | Apparatus and method for intermediate frequency filtering |
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| CN102739194B (en) * | 2012-04-16 | 2015-08-12 | 京信通信系统（中国）有限公司 | The filter that filtering parameter is adjustable |
| CN103634247B (en) * | 2012-08-24 | 2018-07-17 | 深圳市中兴微电子技术有限公司 | A kind of peak clipping implementation method and device |
| CN202931288U (en) | 2012-11-01 | 2013-05-08 | 中兴通讯股份有限公司 | Intermediate frequency analog-to-digital conversion apparatus |
| CN103957180B (en) * | 2014-05-13 | 2018-09-28 | 西安华为技术有限公司 | The method, apparatus and system that digital pre-distortion zooms out |
| CN104539262B (en) * | 2014-12-08 | 2017-07-28 | 北京遥测技术研究所 | A kind of digital fabrication filter processing method of continuous variable speed |
| CN109739199B (en) * | 2019-01-17 | 2021-02-19 | 玖龙纸业（太仓）有限公司 | Automatic change control system filter equipment and automatic control system |
| CN112822783B (en) * | 2020-12-31 | 2023-03-21 | 联想未来通信科技(重庆)有限公司 | Resource scheduling method, device and system |
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| CN1261740A (en) * | 1999-01-20 | 2000-08-02 | 松下电器产业株式会社 | Filter and method for getting filter coefficient |
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| JP4060625B2 (en) * | 2002-04-02 | 2008-03-12 | 東芝テック株式会社 | Image forming apparatus and image forming method |
| CN100411310C (en) * | 2003-03-21 | 2008-08-13 | 世代通信（深圳）有限公司 | Medium frequency signal processing method and circuit in receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1261740A (en) * | 1999-01-20 | 2000-08-02 | 松下电器产业株式会社 | Filter and method for getting filter coefficient |
| CN1440121A (en) * | 2002-02-20 | 2003-09-03 | 松下电器产业株式会社 | Coefficient-setting device of digital electric filter and method thereof |
| CN1992517A (en) * | 2005-12-26 | 2007-07-04 | 中兴通讯股份有限公司 | Programmable interpolated filter device and realizing method therefor |
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