CN105375937A - Digital intermediate frequency variable bandwidth shaping filtering device and method - Google Patents
Digital intermediate frequency variable bandwidth shaping filtering device and method Download PDFInfo
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- CN105375937A CN105375937A CN201510793956.6A CN201510793956A CN105375937A CN 105375937 A CN105375937 A CN 105375937A CN 201510793956 A CN201510793956 A CN 201510793956A CN 105375937 A CN105375937 A CN 105375937A
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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
- H04B1/0017—Digital filtering
Abstract
The invention provides a digital intermediate frequency variable bandwidth shaping filtering device. The digital intermediate frequency variable bandwidth shaping filtering device comprises an intermediate frequency sampling ADC, a digital down converter (DDC) and a CIC integral comb filter, wherein the intermediate frequency sampling ADC samples and quantizes a frequency-selected analog intermediate frequency signal, and converts the signal into a digital intermediate frequency signal; ADC sampling data is sent to the DDC and is subjected to frequency mixing with an NCO digital local oscillator signal, and the digital intermediate frequency signal is subjected to down-conversion to be zero intermediate frequency; the zero intermediate frequency data is sent into the CIC integral comb filter, the order of the comb filter is configured by an external controller according to bandwidth tuning requirements, and bandwidth-tuned digital intermediate frequency is output. According to the digital intermediate frequency variable bandwidth shaping filtering device, the CIC integral comb filter is taken as the bandwidth shaping filter, large-scale adjustment of channel bandwidth can be flexibly and efficiently achieved by changing the order of the integral comb filter, and a problem of data rate reduction caused by extraction can be greatly solved.
Description
Technical field
The present invention relates to technical field of radio, particularly a kind of digital intermediate frequency bandwidth varying forming filter, also relate to a kind of digital intermediate frequency bandwidth varying shaping filter method.
Background technology
Adopt the digital if receiver of software and radio technique, the cascade of DDC, CIC decimation filter and configurable coefficient FIR filter becomes the classical digital signal processing method of baseband conversion and signal bandwidth control.Be the predetection afterbody of intermediate frequency due to FIR filter and be the narrowest one-level filter, its bandwidth sum shape determines the channel width and shape that enter intermediate frequency wave detector, therefore is referred to as intermediate-frequency bandwidth forming filter.
For the application that requirement of real-time is higher, DDC, CIC decimation filter and configurable coefficient FIR filter all need to realize in FPGA, wherein FIR filter needs to take a large amount of gate and multiplier resources in the realization of FPGA inside, therefore design the FIR filter of multiple different rank, the adjustment on a large scale being realized bandwidth by switching is infeasible in engineer applied, and can only realize very limited bandwidth tuning by the configuration coefficients of amendment FIR filter.
In numerous applications, especially require to realize the tuning of intermediate-frequency channel bandwidth on a large scale in spectrum analysis application, its bandwidth change is at present than 5 to 6 the number magnitudes required up to 10, and existing method is that the extraction factor by changing CIC decimation filter realizes.But along with extracting the increase of ratio, digital intermediate frequency detection data transfer rate can reduce by inverse ratio, when the video detection data transfer rate of intermediate frequency detection data transfer rate lower than designing requirement, a kind of way extends the spectrum analysis time to reduce video detection data transfer rate, and another kind of way meets video detection requirement by interpolation.
This two kinds of methods or can reduce the performance of spectrum analysis, or can increase the complexity of design, reason does not all have to solve from source the problem that data transfer rate reduces.
In spectrum analysis application, bandwidth forming filter is used for realizing frequency spectrum and differentiates, and for realizing the optimization of spectral resolution under different test frequency range, requires that forming filter bandwidth can be tuning on a large scale.
Adopt the spectrum analyzer of digital if technology, its digital medium-frequency signal process framework is made up of ADC analog intermediate frequency collection+DDC Digital Down Convert+CIC filtering extraction+FIR shaping filter 4 essential parts.If the sample clock frequency of ADC is f
s, the extraction factor of CIC decimation filter is the normalization bandwidth of D, FIR forming filter is BW, and ignore the impact of CIC decimation filter on bandwidth, then spectral resolution RBW can be expressed as:
RBW＝BW×f
S÷D(1)
As can be seen here, extract factor D and get different numerical value, RBW changes thereupon.Span because of D be greater than 1 integer, therefore by amendment extract factor D can realize the tuning of spectral resolution on a large scale.
Extract factor D by amendment and can realize the tuning of spectral resolution on a large scale, mean that the value of D needs to change within a large range.Intermediate frequency data rate after extraction can drop to f
sd/mono-, therefore when the value of D is very large, intermediate frequency detection data transfer rate can become very low, in fact far below rear class signal handling capacity.
When intermediate frequency detection data transfer rate requires lower than video detection signal transacting lowest data rate, reduce video detection data transfer rate and can increase the spectrum analysis time by inverse ratio, namely reduce spectrum analysis speed; The time domain fluctuation characteristic adopting the mode of matching interpolation to improve intermediate frequency detection data transfer rate objectively can not to reflect real frequency spectrum, also can increase the complexity of design.
Summary of the invention
The present invention proposes a kind of digital intermediate frequency bandwidth varying forming filter and filtering method, alternative traditional realizes the tuning scheme of intermediate-frequency channel band broad range by changing CIC decimation filter extraction factor D, avoids causing spectrum analysis to slow because intermediate frequency detection data transfer rate reduces and designing complicated.
Technical scheme of the present invention is achieved in that
A kind of digital intermediate frequency bandwidth varying forming filter, comprising: if sampling ADC, DDC digital down converter, CIC integral comb filter;
If sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal; ADC sampled data is sent into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency; Zero intermediate frequency data are sent into CIC integral comb filter, and need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, it exports as the digital intermediate frequency through bandwidth conditioning.
Above-mentioned digital intermediate frequency bandwidth varying forming filter, also comprise anti-aliasing decimation filter, anti-aliasing decimation filter is between DDC digital down converter and CIC integral comb filter;
Zero intermediate frequency data are sent into anti-aliasing decimation filter, is configured by peripheral control unit and extract ratio, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up.
Alternatively, anti-aliasing decimation filter adopts half band decimation filter.
Alternatively, anti-aliasing decimation filter adopts CIC Integrator-Comb decimation filter.
Present invention also offers a kind of digital intermediate frequency bandwidth varying shaping filter method, comprise if sampling ADC, DDC digital down converter, CIC integral comb filter, filter step is as follows:
Step (1), if sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal;
Step (2), sends ADC sampled data into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency;
Zero intermediate frequency data are sent into CIC integral comb filter by step (3), need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, and it exports as the digital intermediate frequency through bandwidth conditioning, for rear class signal transacting.
Above-mentioned digital intermediate frequency bandwidth varying shaping filter method, also comprise anti-aliasing decimation filter, anti-aliasing decimation filter is between DDC digital down converter and CIC integral comb filter;
Zero intermediate frequency data are sent into anti-aliasing decimation filter, needs to be configured by peripheral control unit to extract ratio according to design, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up.
Alternatively, anti-aliasing decimation filter adopts half band decimation filter.
Alternatively, anti-aliasing decimation filter adopts CIC Integrator-Comb decimation filter.
The invention has the beneficial effects as follows:
(1) exponent number by changing CIC integral comb filter realizes bandwidth conditioning, can not reduce digital intermediate frequency data transfer rate;
(2) substitute FIR filter with CIC integral comb filter and be used as bandwidth forming filter, without the need to multiplying, simplicity of design, FPGA realizes logical resource and takies few;
(3) in spectrum analyzer application, extracting the factor only for regulating the proportionate relationship between intermediate frequency detection output data rate and video detection output data rate, being easy to the optimization accomplishing various video detection categorical data treatment conditions;
(4) video detection is no longer needed to export the interpolation process of data, thus simplified design.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the theory diagram of digital intermediate frequency bandwidth varying forming filter of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Digital intermediate frequency bandwidth varying forming filter of the present invention, its composition structure as shown in Figure 1, comprise: if sampling ADC, DDC digital down converter, CIC integral comb filter, preferably, when needing in designing to reduce intermediate frequency output data rate, also comprise anti-aliasing decimation filter, the position of anti-aliasing decimation filter must between DDC digital down converter and CIC integral comb filter.
The operation principle of digital intermediate frequency bandwidth varying forming filter of the present invention is: if sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal; ADC sampled data is sent into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency; Zero intermediate frequency data are sent into anti-aliasing decimation filter, need to be configured by peripheral control unit to extract ratio according to design, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up, and anti-aliasing decimation filter can adopt half band decimation filter, also other forms such as CIC Integrator-Comb decimation filter can be adopted, if rear class process, without the requirement of reduction intermediate frequency data rate, also can not do filtering extraction; Zero intermediate frequency data after extracting are sent into CIC integral comb filter, and need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, it exports the digital intermediate frequency be through bandwidth conditioning, for rear class signal transacting.
Present invention also offers a kind of digital intermediate frequency bandwidth varying shaping filter method, its composition structure as shown in Figure 1, comprise: if sampling ADC, DDC digital down converter, CIC integral comb filter, preferably, when needing in designing to reduce intermediate frequency output data rate, also comprise anti-aliasing decimation filter, the position of anti-aliasing decimation filter must between DDC digital down converter and CIC integral comb filter.
Filtering method of the present invention comprises the following steps:
Step (1), if sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal;
Step (2), sends ADC sampled data into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency;
Step (21), zero intermediate frequency data are sent into anti-aliasing decimation filter, need to be configured by peripheral control unit to extract ratio according to design, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up, and anti-aliasing decimation filter can adopt half band decimation filter, also can adopt other forms such as CIC Integrator-Comb decimation filter, if rear class process is without the requirement of reduction intermediate frequency data rate, also can not do filtering extraction;
Zero intermediate frequency data after extracting are sent into CIC integral comb filter by step (3), and need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, it exports the digital intermediate frequency be through bandwidth conditioning, for rear class signal transacting.
In spectrum analysis application, define spectral resolution bandwidth RBW by-three dB bandwidth.The frequency response of known Q level CIC integral comb filter is:
H
Q(e
jω)＝[sin(ωD/2)/sin(ω/2)]
Q(2)
As can be seen here, when prime extracts, do bandwidth forming filter with CIC integral comb filter, its main lobe-three dB bandwidth ω is interval at 0 to 2 π/D, make HQ (ej ω) equal the numerical value of DQ/2, therefore its RBW bandwidth realized is relevant with exponent number D to its progression Q.
When meeting the requirement of RBW stopband, the progression Q of CIC integral comb filter is normally changeless, and now change the resolution that exponent number D realizes RBW bandwidth tuning and be approximately equal to 2/D, therefore exponent number D value is larger, attainable RBW is tuning, and resolution is higher.
The present invention adopts CIC integral comb filter to do bandwidth forming filter, by the adjustment on a large scale realizing channel width that the exponent number changing integral comb filter can be flexible and efficient, anti-aliasing decimation filter, only for regulating digital intermediate frequency data transfer rate according to rear class Digital Signal Processing demand, can be good at solving the data transfer rate reduction problem extracting and cause.
And, realize bandwidth conditioning by the exponent number changing CIC integral comb filter, digital intermediate frequency data transfer rate can not be reduced.
Moreover substitute FIR filter with CIC integral comb filter and be used as bandwidth forming filter, without the need to multiplying, simplicity of design, FPGA realizes logical resource and takies few.
In spectrum analyzer application, extracting the factor only for regulating the proportionate relationship between intermediate frequency detection output data rate and video detection output data rate, being easy to the optimization accomplishing various video detection categorical data treatment conditions.
The present invention no longer needs video detection to export the interpolation process of data, thus simplified design.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a digital intermediate frequency bandwidth varying forming filter, is characterized in that, comprising: if sampling ADC, DDC digital down converter, CIC integral comb filter;
If sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal; ADC sampled data is sent into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency; Zero intermediate frequency data are sent into CIC integral comb filter, and need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, it exports as the digital intermediate frequency through bandwidth conditioning.
2. a kind of digital intermediate frequency bandwidth varying forming filter as claimed in claim 1, it is characterized in that, also comprise anti-aliasing decimation filter, anti-aliasing decimation filter is between DDC digital down converter and CIC integral comb filter;
Zero intermediate frequency data are sent into anti-aliasing decimation filter, is configured by peripheral control unit and extract ratio, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up.
3. a kind of digital intermediate frequency bandwidth varying forming filter as claimed in claim 2, is characterized in that, anti-aliasing decimation filter adopts half band decimation filter.
4. a kind of digital intermediate frequency bandwidth varying forming filter as claimed in claim 2, is characterized in that, anti-aliasing decimation filter adopts CIC Integrator-Comb decimation filter.
5. a digital intermediate frequency bandwidth varying shaping filter method, is characterized in that, comprise if sampling ADC, DDC digital down converter, CIC integral comb filter, filter step is as follows:
Step (1), if sampling ADC carries out sample quantization to the analog if signal through frequency-selecting, is changed into digital medium-frequency signal;
Step (2), sends ADC sampled data into DDC low-converter, with the mixing of NCO digital local oscillator signal, digital medium-frequency signal is downconverted to zero intermediate frequency;
Zero intermediate frequency data are sent into CIC integral comb filter by step (3), and need configuration comb filter exponent number by peripheral control unit according to bandwidth tuning, it exports as the digital intermediate frequency through bandwidth conditioning.
6. a kind of digital intermediate frequency bandwidth varying shaping filter method as claimed in claim 5, it is characterized in that, also comprise anti-aliasing decimation filter, anti-aliasing decimation filter is between DDC digital down converter and CIC integral comb filter;
Zero intermediate frequency data are sent into anti-aliasing decimation filter, needs to be configured by peripheral control unit to extract ratio according to design, realize the anti-aliasing filter to zero intermediate frequency signals and data pick-up.
7. a kind of digital intermediate frequency bandwidth varying shaping filter method as claimed in claim 6, is characterized in that, anti-aliasing decimation filter adopts half band decimation filter.
8. a kind of digital intermediate frequency bandwidth varying shaping filter method as claimed in claim 6, is characterized in that, anti-aliasing decimation filter adopts CIC Integrator-Comb decimation filter.
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