CN105375937B - A kind of digital intermediate frequency bandwidth varying forming filter and filtering method - Google Patents
A kind of digital intermediate frequency bandwidth varying forming filter and filtering method Download PDFInfo
- Publication number
- CN105375937B CN105375937B CN201510793956.6A CN201510793956A CN105375937B CN 105375937 B CN105375937 B CN 105375937B CN 201510793956 A CN201510793956 A CN 201510793956A CN 105375937 B CN105375937 B CN 105375937B
- Authority
- CN
- China
- Prior art keywords
- filter
- intermediate frequency
- digital
- cic
- bandwidth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04B1/0017—Digital filtering
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The present invention proposes a kind of digital intermediate frequency bandwidth varying forming filter, including：If sampling ADC, DDC digital down converter, CIC integral comb filters；If sampling ADC carries out sample quantization to the analog if signal Jing Guo frequency-selecting, is transformed into digital medium-frequency signal；ADC sampled datas are sent into DDC low-converters, is mixed with NCO digital local oscillator signals, digital medium-frequency signal is downconverted into zero intermediate frequency；Zero intermediate frequency data are sent into CIC integral comb filters, comb filter exponent number are needed to configure according to bandwidth tuning by peripheral control unit, output is the digital intermediate frequency improved by bandwidth.The present invention does bandwidth forming filter using CIC integral comb filters, a wide range of adjustment for the realization channel width that the exponent number by changing integral comb filter can be flexible and efficient, and can be good at data transfer rate caused by solving the problems, such as to extract reduces.
Description
Technical field
The present invention relates to technical field of radio, more particularly to a kind of digital intermediate frequency bandwidth varying forming filter also relates to
A kind of and digital intermediate frequency bandwidth varying shaping filter method.
Background technology
Using the digital if receiver of software and radio technique, DDC, CIC decimation filter and the filter of configurable coefficient FIR
The classical digital signal processing method that the cascade of wave device controls as baseband conversion and signal bandwidth.In being due to FIR filter
Frequently predetection afterbody and be most narrow level-one filter, bandwidth and shape determine the channel strip into intermediate frequency wave detector
Wide and shape, therefore referred to as intermediate-frequency bandwidth forming filter.
For the higher application of requirement of real-time, DDC, CIC decimation filter and configurable coefficient FIR filter are required for
It is realized in FPGA, wherein realization of the FIR filter inside FPGA needs to occupy a large amount of logic gates and multiplier resources, therefore sets
The FIR filter for counting multiple and different exponent numbers, by switching realize bandwidth it is a wide range of adjust in engineer application be it is infeasible,
And the configuration coefficients by changing FIR filter can only realize very limited bandwidth tuning.
In numerous applications, it especially requires to realize a wide range of tuning of intermediate-frequency channel bandwidth, mesh in spectrum analysis application
Its preceding bandwidth changes 5 to 6 number magnitudes than requiring up to 10, and existing method is the pumping by changing CIC decimation filters
The factor is taken to realize.But with the increase for extracting ratio, digital intermediate frequency detection data transfer rate meeting inverse ratio reduces, when intermediate frequency detection data transfer rate
Less than design requirement video detection data transfer rate when, a kind of method is to extend the spectrum analysis time to reduce video detection data transfer rate,
Another method is to meet video detection requirement by interpolation.
Both methods can either reduce the performance of spectrum analysis or can increase the complexity of design, the reason is that all not having
Have and solves the problems, such as data transfer rate reduction from source.
In spectrum analysis application, bandwidth forming filter is differentiated for realizing frequency spectrum, to realize under different test bandwidths
The optimization of spectral resolution, it is desirable that forming filter bandwidth can tune on a large scale.
Using the spectrum analyzer of digital if technology, digital medium-frequency signal processing framework acquires by ADC analog intermediate frequencies+
4 essential part compositions of DDC Digital Down Convert+CIC filtering extraction+FIR shaping filters.If the sample clock frequency of ADC is fS,
The decimation factor of CIC decimation filters is D, and the normalization bandwidth of FIR forming filters is BW, ignores CIC decimation filters pair
The influence of bandwidth, then spectral resolution RBW can be expressed as：
RBW=BW × fS÷D (1)
It can be seen that decimation factor D takes different numerical value, RBW to change correspondingly.Because the value range of D is whole more than 1
Number, therefore can realize a wide range of tuning of spectral resolution by changing decimation factor D.
The a wide range of tuning of spectral resolution can be realized by changing decimation factor D, it is meant that the value of D is needed very big
In the range of change.Intermediate frequency data rate after extraction can fall to fSD/mono-, therefore when the value of D is very big, intermediate frequency detection
Data transfer rate can become very low, actually be far below rear class signal handling capacity.
When intermediate frequency detection data transfer rate is required less than video detection signal processing lowest data rate, video detection data are reduced
Rate can inverse ratio increase spectrum analysis time, i.e. reduction spectrum analysis speed；Intermediate frequency detection number is improved by the way of being fitted interpolation
The time domain fluctuation characteristic that cannot objectively reflect real frequency spectrum according to rate, can also increase the complexity of design.
Invention content
The present invention proposes a kind of digital intermediate frequency bandwidth varying forming filter and filtering method, substitutes and traditional passes through change
CIC decimation filter decimation factors D realizes the scheme that intermediate-frequency channel is tuned with broad range, avoids dropping because of intermediate frequency detection data transfer rate
It is low that spectrum analysis is caused to slow and design complication.
The technical proposal of the invention is realized in this way：
A kind of digital intermediate frequency bandwidth varying forming filter, including：If sampling ADC, DDC digital down converter, CIC products
Divide comb filter；
If sampling ADC carries out sample quantization to the analog if signal Jing Guo frequency-selecting, is transformed into digital intermediate frequency letter
Number；ADC sampled datas are sent into DDC low-converters, is mixed with NCO digital local oscillator signals, digital medium-frequency signal is downconverted to
Zero intermediate frequency；Zero intermediate frequency data are sent into CIC integral comb filters, pectination is needed to configure according to bandwidth tuning by peripheral control unit
Filter order, output are the digital intermediate frequency improved by bandwidth.
Above-mentioned digital intermediate frequency bandwidth varying forming filter further includes anti-aliasing decimation filter, anti-aliasing filtering extraction
Device is between DDC digital down converters and CIC integral comb filters；
Zero intermediate frequency data are sent into anti-aliasing decimation filter, is configured by peripheral control unit and extracts ratio, are realized to zero intermediate frequency
The anti-aliasing filter and data pick-up of signal.
Optionally, anti-aliasing decimation filter is using half band decimation filter.
Optionally, anti-aliasing decimation filter uses CIC Integrator-Comb decimation filters.
The present invention also provides a kind of digital intermediate frequency bandwidth varying shaping filter methods, including if sampling ADC, DDC number
Word low-converter, CIC integral comb filters, filter step are as follows：
Step (1), if sampling ADC carry out sample quantization to the analog if signal Jing Guo frequency-selecting, are transformed into counting
Word intermediate-freuqncy signal；
ADC sampled datas are sent into DDC low-converters, are mixed with NCO digital local oscillator signals, by digital intermediate frequency by step (2)
Signal downconverts to zero intermediate frequency；
Zero intermediate frequency data are sent into CIC integral comb filters, by peripheral control unit according to bandwidth tuning need by step (3)
Comb filter exponent number is configured, output is the digital intermediate frequency improved by bandwidth, is used for rear class signal processing.
Above-mentioned digital intermediate frequency bandwidth varying shaping filter method, further includes anti-aliasing decimation filter, anti-aliasing extraction filter
Wave device is between DDC digital down converters and CIC integral comb filters；
Zero intermediate frequency data are sent into anti-aliasing decimation filter, is configured by peripheral control unit extract ratio according to the design needs,
Realize the anti-aliasing filter and data pick-up to zero intermediate frequency signals.
Optionally, anti-aliasing decimation filter is using half band decimation filter.
Optionally, anti-aliasing decimation filter uses CIC Integrator-Comb decimation filters.
The beneficial effects of the invention are as follows：
(1) it realizes bandwidth conditioning by changing the exponent number of CIC integral comb filters, digital intermediate frequency data will not be reduced
Rate；
(2) it uses CIC integral comb filters to substitute FIR filter and is used as bandwidth forming filter, be not necessarily to multiplying, if
Meter is simple, and it is few that FPGA realizes that logical resource occupies；
(3) in spectrum analyzer application, decimation factor is only used for adjusting intermediate frequency detection output data rate and video detection
Proportionate relationship between output data rate, it is easy to accomplish the optimization of various video detection categorical data treatment conditions；
(4) interpolation of video detection output data is no longer needed to handle, to simplify design.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is the functional block diagram of digital intermediate frequency bandwidth varying forming filter of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The digital intermediate frequency bandwidth varying forming filter of the present invention, composed structure is as shown in Figure 1, include：If sampling
ADC, DDC digital down converter, CIC integral comb filters, it is preferable that when needed in design reduce intermediate frequency output data rate
When, further include anti-aliasing decimation filter, the position of anti-aliasing decimation filter must be located at DDC digital down converters and CIC is accumulated
Divide between comb filter.
The operation principle of digital intermediate frequency bandwidth varying forming filter of the present invention is：If sampling ADC is to passing through frequency-selecting
Analog if signal carry out sample quantization, be transformed into digital medium-frequency signal；ADC sampled datas are sent into DDC down coversions
Device, is mixed with NCO digital local oscillator signals, and digital medium-frequency signal is downconverted to zero intermediate frequency；Zero intermediate frequency data are sent into anti-aliasing
Decimation filter is configured by peripheral control unit extract ratio according to the design needs, realize to the anti-aliasing filters of zero intermediate frequency signals and
Data pick-up, and half band decimation filter may be used in anti-aliasing decimation filter, CIC Integrator-Combs can also be used to extract filter
The other forms such as wave device, if rear class processing can not also do filtering extraction without the requirement of intermediate frequency data rate is reduced；By zero after extraction
Intermediate frequency data is sent into CIC integral comb filters, and comb filter exponent number is needed to configure according to bandwidth tuning by peripheral control unit,
It is to be used for rear class signal processing by the digital intermediate frequency of bandwidth conditioning that it, which is exported,.
The present invention also provides a kind of digital intermediate frequency bandwidth varying shaping filter method, composed structure is as shown in Figure 1, packet
It includes：If sampling ADC, DDC digital down converter, CIC integral comb filters, it is preferable that when needed in design reduce intermediate frequency
Further include anti-aliasing decimation filter when output data rate, the position of anti-aliasing decimation filter must be located at DDC Digital Down Converts
Between device and CIC integral comb filters.
The filtering method of the present invention includes the following steps：
Step (1), if sampling ADC carry out sample quantization to the analog if signal Jing Guo frequency-selecting, are transformed into counting
Word intermediate-freuqncy signal；
ADC sampled datas are sent into DDC low-converters, are mixed with NCO digital local oscillator signals, by digital intermediate frequency by step (2)
Signal downconverts to zero intermediate frequency；
Zero intermediate frequency data are sent into anti-aliasing decimation filter, are matched according to the design needs by peripheral control unit by step (21)
Extraction ratio is set, realizes anti-aliasing filter and data pick-up to zero intermediate frequency signals, and anti-aliasing decimation filter may be used half
Band decimation filter can also use the other forms such as CIC Integrator-Comb decimation filters, if rear class processing is without frequency in reduction
It is required according to rate, filtering extraction can not also be done；
Zero intermediate frequency data after extraction are sent into CIC integral comb filters, by peripheral control unit according to band by step (3)
Broad tuning needs to configure comb filter exponent number, and output is by the digital intermediate frequency of bandwidth conditioning, at rear class signal
Reason.
In spectrum analysis application, spectral resolution bandwidth RBW is defined with-three dB bandwidth.Known Q grades of CIC Integrator-Comb
The frequency response of filter is：
HQ(ejω)=[sin (ω D/2)/sin (ω/2)]Q (2)
It can be seen that in the case where prime does not extract, bandwidth forming filter is done with CIC integral comb filters,
Its main lobe-three dB bandwidth ω makes HQ (ej ω) be equal to the numerical value of DQ/2 in 0 to 2 π/sections D, thus its RBW bandwidth for realizing and its
Series Q is related to exponent number D.
In the case where meeting RBW stopband requirements, the series Q of CIC integral comb filters be usually fixed it is constant, this
When change exponent number D and realize that the resolution ratio of RBW bandwidth tunings is approximately equal to 2/D, therefore exponent number D values it is bigger, it can be achieved that RBW tunings
Resolution ratio is higher.
The present invention does bandwidth forming filter using CIC integral comb filters, by changing integral comb filter
Exponent number can be flexible and efficient realization channel width a wide range of adjustment, anti-aliasing decimation filter be only used for according to rear class number believe
Number process demand adjusts digital intermediate frequency data transfer rate, can be good at data transfer rate reduction caused by solving the problems, such as to extract.
Moreover, realizing bandwidth conditioning by changing the exponent number of CIC integral comb filters, digital intermediate frequency data will not be reduced
Rate.
Furthermore it substitutes FIR filter with CIC integral comb filters and is used as bandwidth forming filter, be not necessarily to multiplying,
Design is simple, and it is few that FPGA realizes that logical resource occupies.
In spectrum analyzer application, decimation factor is only used for adjusting intermediate frequency detection output data rate and video detection output
Proportionate relationship between data transfer rate, it is easy to accomplish the optimization of various video detection categorical data treatment conditions.
The present invention no longer needs the interpolation of video detection output data to handle, to simplify design.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (6)
1. a kind of digital intermediate frequency bandwidth varying forming filter, which is characterized in that including：Become under if sampling ADC, DDC number
Frequency device, CIC integral comb filters further include anti-aliasing decimation filter, and anti-aliasing decimation filter, which is located under DDC numbers, to be become
Between frequency device and CIC integral comb filters；
If sampling ADC carries out sample quantization to the analog if signal Jing Guo frequency-selecting, is transformed into digital medium-frequency signal；It will
ADC sampled datas are sent into DDC low-converters, are mixed with NCO digital local oscillator signals, digital medium-frequency signal is downconverted in zero
Frequently；Zero intermediate frequency data are sent into anti-aliasing decimation filter, is configured by peripheral control unit and extracts ratio, are realized to zero intermediate frequency signals
Anti-aliasing filter and data pick-up；Zero intermediate frequency data after extraction are sent into CIC integral comb filters, by peripheral control unit root
Comb filter exponent number is needed to configure according to bandwidth tuning, output is the digital intermediate frequency improved by bandwidth.
2. a kind of digital intermediate frequency bandwidth varying forming filter as described in claim 1, which is characterized in that anti-aliasing extraction filter
Wave device is using half band decimation filter.
3. a kind of digital intermediate frequency bandwidth varying forming filter as described in claim 1, which is characterized in that anti-aliasing extraction filter
Wave device uses CIC Integrator-Comb decimation filters.
4. a kind of digital intermediate frequency bandwidth varying shaping filter method, which is characterized in that including becoming under if sampling ADC, DDC number
Frequency device, anti-aliasing decimation filter, CIC integral comb filters, filter step are as follows：
Step (1), if sampling ADC carry out sample quantization to the analog if signal Jing Guo frequency-selecting, are transformed into number
Frequency signal；
ADC sampled datas are sent into DDC low-converters, are mixed with NCO digital local oscillator signals, by digital medium-frequency signal by step (2)
Downconvert to zero intermediate frequency；
Zero intermediate frequency data are sent into anti-aliasing decimation filter by step (3), are configured extract by peripheral control unit according to the design needs
Than realizing the anti-aliasing filter and data pick-up to zero intermediate frequency signals；
Zero intermediate frequency data after extraction are sent into CIC integral comb filters, by peripheral control unit according to bandwidth tune by step (4)
Humorous to need to configure comb filter exponent number, output is the digital intermediate frequency improved by bandwidth.
5. a kind of digital intermediate frequency bandwidth varying shaping filter method as claimed in claim 4, which is characterized in that anti-aliasing extraction
Filter is using half band decimation filter.
6. a kind of digital intermediate frequency bandwidth varying shaping filter method as claimed in claim 4, which is characterized in that anti-aliasing extraction
Filter uses CIC Integrator-Comb decimation filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510793956.6A CN105375937B (en) | 2015-11-11 | 2015-11-11 | A kind of digital intermediate frequency bandwidth varying forming filter and filtering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510793956.6A CN105375937B (en) | 2015-11-11 | 2015-11-11 | A kind of digital intermediate frequency bandwidth varying forming filter and filtering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105375937A CN105375937A (en) | 2016-03-02 |
| CN105375937B true CN105375937B (en) | 2018-10-02 |
Family
ID=55377789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510793956.6A Active CN105375937B (en) | 2015-11-11 | 2015-11-11 | A kind of digital intermediate frequency bandwidth varying forming filter and filtering method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105375937B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800441B (en) * | 2017-10-26 | 2021-05-28 | 慧众行知科技（北京）有限公司 | Signal processing method and system |
| CN107885118B (en) * | 2017-11-10 | 2019-07-09 | 中国电子科技集团公司第四十一研究所 | A kind of variable center frequency signal processing method, system and programming device |
| CN107994909B (en) * | 2017-12-04 | 2021-04-09 | 中国矿业大学 | Anti-image aliasing method for radio frequency signal receiver |
| CN110954923B (en) * | 2019-12-10 | 2020-11-10 | 北京空间飞行器总体设计部 | GNSS deception jamming signal's detecting system |
| CN113746430A (en) * | 2021-08-27 | 2021-12-03 | 山西宇翔信息技术有限公司 | Signal processing method and device |
| CN114826307B (en) * | 2022-06-28 | 2022-09-20 | 中星联华科技（北京）有限公司 | Digital channelized receiver, signal acquisition playback system and method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442296A (en) * | 2007-11-23 | 2009-05-27 | 深圳Tcl工业研究院有限公司 | Digital decimation filter |
| CN102098004A (en) * | 2010-12-16 | 2011-06-15 | 电子科技大学 | Digital downconverter with variable bandwidth and implementation method thereof |
| CN102403986A (en) * | 2011-11-25 | 2012-04-04 | 京信通信系统（中国）有限公司 | Multi-channel CIC (Cascade Integrator Comb) decimation filter and method for realizing same |
| CN102694563A (en) * | 2012-06-21 | 2012-09-26 | 山东神戎电子股份有限公司 | Digital demodulation down-conversion system and method for acoustical signals |
| CN102928665A (en) * | 2012-11-01 | 2013-02-13 | 南京国睿安泰信科技股份有限公司 | Intermediate frequency digital spectrum analyzer and method thereof |
| CN103095220A (en) * | 2013-01-25 | 2013-05-08 | 西安电子科技大学 | Design method of miniature synthetic aperture radar (SAR) digital down converter based on rapidly-moving finite impulse response (FIR) filter |
| CN103647513A (en) * | 2013-12-24 | 2014-03-19 | 苏州国越信息科技有限公司 | Digital down converter |
| CN103684514A (en) * | 2013-11-25 | 2014-03-26 | 成都九华圆通科技发展有限公司 | Multichannel ADC synchronous sampling intermediate frequency receiver and synchronous sampling method |
| CN104201991A (en) * | 2014-09-10 | 2014-12-10 | 四川九洲电器集团有限责任公司 | Digital down-converting system for implementing frequency-agility metrewave radar |
| CN104320107A (en) * | 2014-11-11 | 2015-01-28 | 中国电子科技集团公司第四十一研究所 | Method for designing bandwidth changeable CIC filter |
| CN204290909U (en) * | 2014-12-15 | 2015-04-22 | 天津大学 | The digital filter that a kind of bandwidth, center frequency point are adjustable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG128531A1 (en) * | 2005-07-06 | 2007-01-30 | Oki Techno Ct Singapore Pte | A dpsk demodulator and method |
-
2015
- 2015-11-11 CN CN201510793956.6A patent/CN105375937B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442296A (en) * | 2007-11-23 | 2009-05-27 | 深圳Tcl工业研究院有限公司 | Digital decimation filter |
| CN102098004A (en) * | 2010-12-16 | 2011-06-15 | 电子科技大学 | Digital downconverter with variable bandwidth and implementation method thereof |
| CN102403986A (en) * | 2011-11-25 | 2012-04-04 | 京信通信系统（中国）有限公司 | Multi-channel CIC (Cascade Integrator Comb) decimation filter and method for realizing same |
| CN102694563A (en) * | 2012-06-21 | 2012-09-26 | 山东神戎电子股份有限公司 | Digital demodulation down-conversion system and method for acoustical signals |
| CN102928665A (en) * | 2012-11-01 | 2013-02-13 | 南京国睿安泰信科技股份有限公司 | Intermediate frequency digital spectrum analyzer and method thereof |
| CN103095220A (en) * | 2013-01-25 | 2013-05-08 | 西安电子科技大学 | Design method of miniature synthetic aperture radar (SAR) digital down converter based on rapidly-moving finite impulse response (FIR) filter |
| CN103684514A (en) * | 2013-11-25 | 2014-03-26 | 成都九华圆通科技发展有限公司 | Multichannel ADC synchronous sampling intermediate frequency receiver and synchronous sampling method |
| CN103647513A (en) * | 2013-12-24 | 2014-03-19 | 苏州国越信息科技有限公司 | Digital down converter |
| CN104201991A (en) * | 2014-09-10 | 2014-12-10 | 四川九洲电器集团有限责任公司 | Digital down-converting system for implementing frequency-agility metrewave radar |
| CN104320107A (en) * | 2014-11-11 | 2015-01-28 | 中国电子科技集团公司第四十一研究所 | Method for designing bandwidth changeable CIC filter |
| CN204290909U (en) * | 2014-12-15 | 2015-04-22 | 天津大学 | The digital filter that a kind of bandwidth, center frequency point are adjustable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105375937A (en) | 2016-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105375937B (en) | A kind of digital intermediate frequency bandwidth varying forming filter and filtering method | |
| US7489745B2 (en) | Reconfigurable direct RF bandpass sampling receiver and related methods | |
| DE69831271T2 (en) | DEVICE AND METHOD OF DECIMATION FILTERING | |
| US6993464B2 (en) | Optimized filter parameters design for digital IF programmable downconverter | |
| CN104301052B (en) | Seamless collecting and real-time frequency spectrum monitoring implementation method based on FPGA | |
| JP5355589B2 (en) | Sampling circuit and receiver using the same | |
| US8452826B2 (en) | Digital frequency channelizer | |
| CN106972832B (en) | Digital down converter capable of resampling by any multiple | |
| CN107390026A (en) | A kind of digital spectrum analysis method of variable scan width | |
| CN103873016B (en) | A kind of arbitrarily sampling rate conversion digital reconstruction filter coefficient method for designing | |
| US9191043B1 (en) | Direct digital RF conversion | |
| CN108763720A (en) | The implementation method for the DDC that sample rate can be lowered arbitrarily | |
| CN102904594A (en) | Wireless data transmission terminal and intermediate frequency processing method thereof | |
| US10009203B1 (en) | Small-footprint digital receiver for extracting narrowband frequency-slices | |
| CN102187589A (en) | Transceiver having multistage channel filter in wireless communication system | |
| CN102565773A (en) | Two-stage filter achieving method of high-speed data extraction of synthetic aperture radar | |
| EP1620983B1 (en) | A transform-based alias cancellation multi-channel tuner | |
| Chan et al. | Design of constrained causal stable IIR filters using a new second-order-cone-programming-based model-reduction technique | |
| CN108768414B (en) | Channel extractor and software radio receiver | |
| CN106130581A (en) | A kind of multiphase filtering wideband digital channel receiver improves system | |
| CN109813963B (en) | Method and device for realizing frequency spectrum scanning by single chip microcomputer | |
| US9641361B2 (en) | Sub-sampling receiver | |
| CN112910475B (en) | Digital receiver for complex signal monitoring | |
| CN110690909B (en) | Low-complexity dynamic non-uniform channelized user separation method | |
| KR102302227B1 (en) | Method for signal reconstruction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |