CN104796151B - Sampling rate conversion device and method with continuously variable bandwidth - Google Patents
Sampling rate conversion device and method with continuously variable bandwidth Download PDFInfo
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Abstract
The invention discloses a sampling rate conversion device with continuously variable bandwidth and a method thereof, comprising an up-sampling rate conversion unit and a down-sampling rate conversion unit; the up-sampling rate conversion unit comprises a forming filter, an integral multiple interpolation module A, a fractional multiple interpolation module A, DAC and a control module A, wherein the forming filter receives a sequence to be transmitted and outputs the sequence after processing through the integral multiple interpolation module A, the fractional multiple interpolation module A and a DAC (digital-to-analog converter), the down-sampling rate conversion unit comprises an ADC (analog-to-digital converter), a fractional multiple interpolation module B, an integral multiple extraction module B, a matched filter and a control module B, a signal at a receiving end is input into the ADC and output after processing through the fractional multiple interpolation module B, the integral multiple extraction module B and the matched filter, and the control module controls the integral multiple interpolation multiple, the integral multiple extraction multiple and the. The invention has low hardware resource occupancy rate, can increase and decrease the number of half-band filters according to the relation between the target sampling rate and the symbol rate of the input signal, and is suitable for the sampling rate conversion processing of any bandwidth variable signal.
Description
Technical field
The present invention relates to radio communication, digital processing field, more particularly to a kind of sampling of bandwidth continuous variable
Rate conversion equipment and method.
Background technology
Software and radio technique（SDR, Software Definition Radio）, it is always digital processing field
Study hotspot.Its basic thought is to allow digital processing element as close to radio-frequency front-end, reduces analog domain signal transacting
Area, so as on identical hardware design platform, realize multiband, multi-user, the data processing of multi-mode.With channel radio
The fast development of letter technology, various protocols, the continuous proposition of system being capable of compatible different rates, the common software of different bandwidth
Radio design platform just seems particularly urgent.In software radio system, to the defeated of the compatible distinct symbols rate of radio-frequency head
Enter output signal, must just use sample rate switch technology, be converted to different symbol rates with identical sampling in transmitting terminal
The data of rate output；The signal of fixed sample rate is converted to the integral multiple of symbol rate in receiving terminal.It is thus to simplify before radio frequency
End, adapts to unlike signal bandwidth requirement, the method that any multiple sample rate conversion can be carried out to the signal of bandwidth continuous variable
Just there is realistic meaning very much.
China Patent No. 200810057286.1 discloses a kind of realization of digital baseband variable velocity convert modulating system
Method and device is realized, the defeated of fixed sample rate is realized by the way of different channel selectings for the signal of distinct symbols rate
Go out, however, the device of the structure is only applicable to use in the case that symbol rate is less, and be merely able to realize the sample rate of integral multiple
Conversion, then needs to increase the port number of sample rate conversion, the hardware resource occupancy of device is high to increase symbol rate, flexibility compared with
Difference, and it is larger to the consumption of hardware system.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of hardware resource occupancy it is low, using flexible
The sample rate conversion equipment and method of the strong bandwidth continuous variable of property, it has the function of arbitrary integer time speed adjust, can root
Increase and decrease the number of half-band filter according to the relation of target sampling rate and input signal symbol rate, adapt to any adaptive-bandwidth signal
Sample rate conversion process.
The purpose of the present invention is achieved through the following technical solutions：A kind of sample rate converting means of bandwidth continuous variable
Put, it is made up of up-sampling rate converting unit and down-sampling rate converting unit.
Up-sampling rate converting unit includes formed filter, integral multiple interpolation modules A, fraction times interpolation modules A, DAC numbers
Weighted-voltage D/A converter and control module A, formed filter are used for the sequence that receiving end/sending end needs to send, and to fix multiple to pending
Send sequence to carry out filtering interpolation processing, complete the spectral shaping of sequence to be sent；The signal output part of formed filter leads to successively
Cross integral multiple interpolation modules A and fraction times interpolation modules A is connected with DAC digital analog converters, integral multiple interpolation modules A is used for frequency
Data after spectrum shaping carry out the interpolation processing of two integer power times, by the sampling rate conversion of data to fraction times interpolation module
A interpolation process range；Fraction times interpolation modules A is used to carry out at fraction double interpolation the data after the processing of integral multiple interpolation
Reason, the sample rate for making output data is target sampling rate；DAC digital analog converters are responsible for the data after sampling rate conversion entering line number
Word domain to analog domain conversion, and output sampling rate be target sampling rate data；Control module A control signal output point
Control signal input not with integral multiple interpolation modules A and fraction times interpolation modules A is connected, and control module A is used for according to defeated
The symbol rate and the proportionate relationship of target sampling rate of the sequence to be sent entered, calculate the integral multiple interpolation of integral multiple interpolation modules A
Multiple, and fraction times interpolation modules A fraction double interpolation multiple.
Down-sampling rate converting unit include ADC analog-digital converters, fraction times interpolation module B, integral multiple abstraction module B,
It is used for wave filter and control module B, ADC analog-digital converter in receiving terminal, the analog signal of input is entered with fixed sample rate
Row analog domain to numeric field conversion, the digital signal output ends of ADC analog-digital converters pass sequentially through fraction times interpolation module B and
Integral multiple abstraction module B is connected with matched filter；Fraction times interpolation module B receives the numeral letter of ADC analog-digital converters output
Number, and filtering interpolation processing is carried out to the data signal of reception, the sample rate for making the data of fraction times interpolation module B outputs is defeated
Enter the integral multiple of signal code rate；Integral multiple abstraction module B is used to carry out two to the data after the processing of fraction times interpolation
The integral multiple extraction processing of power side, and output sampling rate is M times of signal of input signal symbol rate, M is a fixed value；
The signal being used for wave filter after handling extraction carries out matched filtering；Control module B be used for according to the bandwidth of input signal with
The relation of ADC analog-digital converter sample rates, calculates integral multiple abstraction module B integral multiple extracting multiple, and fraction times interpolation
Module B fraction double interpolation multiple.
Specifically, described integral multiple interpolation modules A is similar with integral multiple abstraction module B structure, filtered by multiple half bands
Ripple device and the cascade of multiple data selectors are formed, and can realize interpolation or the extraction of two n powers times, wherein, n is half band of cascade
Number of filter, data selector is used to control to participate in the processing of integral multiple filtering interpolation or participates in the processing of integral multiple filtering extraction
The number of half-band filter.
For integral multiple interpolation modules A, the output signal after formed filter molding filtration is used as integral multiple interpolation modules A
Input signal, the input of n-th grade of half-band filter is directly the input signal of integral multiple interpolation modules A, n-th grade of semi-band filtering
The output of device is as an input of the (n-1)th DBMS selector, and another input of the (n-1)th DBMS selector is integral multiple
The input signal of interpolation modules A, the output of the (n-1)th DBMS selector as (n-1)th grade of half-band filter input, (n-1)th
The output of level half-band filter is inputted as one of the n-th -2 DBMS selector, and another of the n-th -2 DBMS selector is defeated
Enter for the input signal of integral multiple interpolation modules A, cascade successively, integral multiple is finally used as by the output of the 0th DBMS selector
The output signal of interpolation modules A.
For integral multiple abstraction module B, fraction times interpolation module B output signal is used as the defeated of integral multiple abstraction module B
Enter signal, the input of n-th grade of half-band filter is directly integral multiple abstraction module B input signal, n-th grade of half-band filter
An input as the (n-1)th DBMS selector is exported, another input of the (n-1)th DBMS selector is extracted for integral multiple
Module B input signal, the output of the (n-1)th DBMS selector as (n-1)th grade of half-band filter input, (n-1)th grade half
The output of band filter is inputted as one of the n-th -2 DBMS selector, and another input of the n-th -2 DBMS selector is
Integral multiple abstraction module B input signal, is cascaded successively, is finally extracted by the output of the 0th DBMS selector as integral multiple
Module B output signal.
Specifically, for integral multiple interpolation modules A, the total number of internal half-band filter is by the minimum sequence to be sent inputted
The symbol rate of row and the ratio of target sampling rate are determined；For integral multiple abstraction module B, the total number of internal half-band filter by
The ratio of the bandwidth and the sample rate of ADC analog-digital converters of receiving terminal minimum input signal is determined.
For integral multiple interpolation modules A, the number of the described half-band filter for participating in the processing of integral multiple filtering interpolation by
The symbol rate of the sequence to be sent currently inputted and the ratio of target sampling rate are determined；It is described for integral multiple abstraction module B
The number for the half-band filter that integral multiple filtering extraction is handled is participated in by the symbol rate and ADC moduluses of current receiving terminal input signal
The ratio of the sample rate of converter is determined.
As preferred, described control module A by the way of software control, control module B is also controlled using software
Mode, realize hardware circuit be difficult realize division arithmetic processing.
Filtered as preferred, described fraction times interpolation modules A and fraction times interpolation module B using polynomial interopolation
Device.
Root raised cosine filter is used as preferred, described formed filter.
Under a kind of sampling rate converting method of bandwidth continuous variable, the step of it is changed including a up-sampling rate and one
The step of sample rate is changed, described up-sampling rate conversion includes following sub-step：
S01：Formed filter receiving end/sending end needs the sequence sent, and sequence to be sent is entered with M times of fixed multiple
Row interpolation filters forming processes, is molded signal spectrum, at the same time, control module A receiving end/sending ends sequence to be sent, root
According to the symbol rate and ratio R _ u of target sampling rate of sequence to be sent, the integral multiple interpolation times of integral multiple interpolation modules A is calculated
Number N_u and fraction double interpolation the multiple uk_u, ratio R _ u of fraction times interpolation modules A and integral multiple interpolation multiple N_u, fraction times
Relation between interpolation multiple uk_u is as follows：
R_u=N_u*uk_u*M,
Wherein, M is the fixation interpolation multiple of formed filter；
S02：Integral multiple interpolation modules A receives the data after formed filter processing, the integer provided according to control module A
Times interpolation multiple N_u, needs to participate in the half-band filter that integral multiple filtering interpolation is handled by internal data selector selection,
The sample rate of the data of reception is up-sampled to the incoming frequency scope of fraction times interpolation requirement；
S03：The fraction double interpolation multiple uk_u that fraction times interpolation modules A is provided according to control module A, to integral multiple interpolation
Data after modules A processing carry out the interpolation processing of fraction times, make integral multiple interpolation modules A handle after data sample rate by
Sample rate after integral multiple conversion is changed to target sampling rate；
S04：The data that DAC digital analog converters are transmitted to fraction times interpolation modules A carry out digital-to-analogue conversion, and export analog domain
Data；
So far, up-sampling rate transfer process is completed.
Described down-sampling rate conversion includes following sub-step：
S11：ADC analog-digital converters receive the signal Jing Guo radio frequency analog domain front-end processing, the input to optional sign rate
Signal is sampled with fixed sample rate fs_d, and input signal is transformed into numeric field, at the same time, control module by analog domain
B receives input signal, according to bandwidth parameter f and ADC the sampling rate parameter fs_d of input signal, calculates fraction times interpolation module
B fraction double interpolation multiple uk_d and integral multiple abstraction module B integral multiple extracting multiple N_d, make ADC sample rate and input
The ratio of signal bandwidth is R_d, then the relation between ratio R _ d and fraction double interpolation multiple uk_d, integral multiple extracting multiple N_d
It is as follows：
Wherein, N is multiple of the sample rate with current input signal symbol rate for the signal that integral multiple abstraction module B is exported
Value；
S12：The fraction double interpolation multiple uk_d that fraction times interpolation module B is provided according to control module B, to the numeral of reception
Signal carries out filtering interpolation processing, and the sample rate for making the signal of output is the integral multiple of input signal symbol rate；
S13：The integral multiple extracting multiple N_d that integral multiple abstraction module B is provided according to control module B, passes through internal number
The half-band filter number HB_step_d for needing to participate in the processing of integral multiple filtering extraction is selected according to selector, to fraction double interpolation
Signal after processing carries out integral multiple extraction processing, and output sampling rate is N times of signal of current input signal symbol rate, half band
Relation between number of filter HB_step_d and integral multiple extracting multiple N_d is as follows：
N_d=2HB_step_d；
S14：Signal after matched filter is handled integral multiple extraction is filtered processing, exports filtered signal；
So far, down-sampling rate transfer process is completed.
Further, described fraction times interpolation modules A and fraction times interpolation module B are by the way of polynomial interopolation
Realize that fraction double interpolation is handled, the formula of polynomial interopolation is as follows：
Wherein, lk(x) it is basic point xiN Interpolation-Radix-Function (i=0,1 ... n), x is to need the position of interpolation point,
It is accumulated value not in the same time by interval of uk_d to correspond in device, lk(x) it is the value after interpolation.
Further, described DAC digital analog converters are operated in identical clock frequency under any symbol rate.
The beneficial effects of the invention are as follows：
（1）Control module A and control module B realize that hardware circuit is difficult removing for realization by the way of software control
Method computing, simplifies hardware circuit, saves hardware spending；
（2）Control module A and control module B can flexibly configure integral multiple interpolation multiple or integral multiple extracting multiple, with
And fraction double interpolation multiple, it is applicable the fixed sample rate output in the case of different incoming symbol rates；
（3）Integral multiple interpolation modules A and integral multiple abstraction module B are selected using multi-level semi-band filter and multi-stage data
The mode of device cascade, the function with arbitrary integer time speed adjust can be according to target sampling rate and input signal symbol rate
Relation increases and decreases the number of half-band filter, adapts to the sample rate conversion process of any adaptive-bandwidth signal, enhances whole dress
The adaptability and signal handling capacity put.
Brief description of the drawings
Fig. 1 is the structured flowchart of up-sampling rate converting unit of the present invention；
Fig. 2 is the structured flowchart of down-sampling rate converting unit of the present invention；
The input and output schematic diagram that Fig. 3 is control module A in up-sampling rate converting unit；
Fig. 4 is the theory diagram of integral multiple interpolation modules A in up-sampling rate converting unit；
Fig. 5 is fraction double interpolation wave filter input and output schematic diagram；
Fig. 6 show the input and output schematic diagram of control module B in down-sampling rate converting unit.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in figure 1, a kind of sample rate conversion equipment of bandwidth continuous variable, it is adopted by up-sampling rate converting unit with
Sample rate converting unit is constituted.
Up-sampling rate converting unit includes formed filter, integral multiple interpolation modules A, fraction times interpolation modules A, DAC numbers
Weighted-voltage D/A converter and control module A, formed filter are used for the sequence that receiving end/sending end needs to send, and with M times of fixation multiple
Filtering interpolation processing is carried out to sequence to be sent, the spectral shaping of sequence to be sent is completed, M typically takes 4, and formed filter is optional
Select root raised cosine filter, naturally it is also possible to the other formed filters of selection；The signal output part of formed filter leads to successively
Cross integral multiple interpolation modules A and fraction times interpolation modules A is connected with DAC digital analog converters, integral multiple interpolation modules A is used for frequency
Data after spectrum shaping carry out the interpolation processing of two integer power times, by the sampling rate conversion of data to fraction times interpolation module
A interpolation process range；Fraction times interpolation modules A is used to carry out at fraction double interpolation the data after the processing of integral multiple interpolation
Reason, the sample rate for making output data is target sampling rate；DAC digital analog converters are responsible for the data after sampling rate conversion entering line number
Word domain to analog domain conversion, and output sampling rate be target sampling rate data；Control module A control signal output point
Control signal input not with integral multiple interpolation modules A and fraction times interpolation modules A is connected, and control module A is used for according to defeated
The symbol rate and the proportionate relationship of target sampling rate of the sequence to be sent entered, calculate the integral multiple interpolation of integral multiple interpolation modules A
Multiple, and fraction times interpolation modules A fraction double interpolation multiple, control module A using software control by the way of, realize hardware
Circuit is difficult the division arithmetic processing realized, improves operation efficiency, and save hardware spending.
Taken out as shown in Fig. 2 down-sampling rate converting unit includes ADC analog-digital converters, fraction times interpolation module B, integral multiple
Modulus block B, matched filter and control module B, ADC analog-digital converter are used in receiving terminal, with fixed sample rate to input
Analog signal carries out analog domain to the conversion of numeric field.The digital signal output end of ADC analog-digital converters passes sequentially through fraction times
Interpolation module B and integral multiple abstraction module B are connected with matched filter；It is defeated that fraction times interpolation module B receives ADC analog-digital converters
The data signal gone out, and filtering interpolation processing is carried out to the data signal of reception, make the data of fraction times interpolation module B outputs
Sample rate is the integral multiple of input signal symbol rate；Integral multiple abstraction module B is used for the number after the processing of fraction times interpolation
According to the integral multiple extraction processing for the power side for carrying out two, and output sampling rate is M times of signal of input signal symbol rate, and M is
One fixed value, typically takes 4；Matched filter is used for the signal after handling extraction and carries out matched filtering；Control module B is used for root
According to the relation of the bandwidth and ADC analog-digital converter sample rates of input signal, the integral multiple for calculating integral multiple abstraction module B is extracted again
Number, and fraction times interpolation module B fraction double interpolation multiple, by the way of control module B is using software control, realize that hardware is electric
Road is difficult the division arithmetic processing realized.
Described integral multiple interpolation modules A is similar with integral multiple abstraction module B structure, as shown in figure 4, by multiple half bands
Wave filter（HB）With multiple data selectors（Mux）Cascade is formed, each half-band filter（HB）Two times of interpolation processing is realized,
Therefore, integral multiple interpolation modules A can realize the interpolation of two n powers times, and integral multiple abstraction module B can realize two n powers times
Extraction, wherein, n for cascade half-band filter（HB）Number, data selector（Mux）For controlling to participate in integral multiple interpolation
Filtering process or the half-band filter for participating in the processing of integral multiple filtering extraction（HB）Number.
For integral multiple interpolation modules A, the output signal after formed filter molding filtration is used as integral multiple interpolation modules A
Input signal, n-th grade of half-band filter（HBn）Input be directly integral multiple interpolation modules A input signal, n-th grade half
Band filter（HBn）Output be used as the (n-1)th DBMS selector（Muxn-1）One input, the (n-1)th DBMS selector
（Muxn-1）Another input for integral multiple interpolation modules A input signal, the (n-1)th DBMS selector（Muxn-1）Output
It is used as (n-1)th grade of half-band filter（HBn-1）Input, (n-1)th grade of half-band filter（HBn-1）Output be used as the n-th -2 series
According to selector（Muxn-2）One input, the n-th -2 DBMS selector（Muxn-2）Another input be integral multiple interpolation mould
Block A input signal, is cascaded successively, finally by the 0th DBMS selector（Mux0）Output be used as integral multiple interpolation modules A
Output signal.
For integral multiple abstraction module B, fraction times interpolation module B output signal is used as the defeated of integral multiple abstraction module B
Enter signal, n-th grade of half-band filter（HBn）Input be directly integral multiple abstraction module B input signal, n-th grade half band filter
Ripple device（HBn）Output be used as the (n-1)th DBMS selector（Muxn-1）One input, the (n-1)th DBMS selector
（Muxn-1）Another input for integral multiple abstraction module B input signal, the (n-1)th DBMS selector（Muxn-1）Output
It is used as (n-1)th grade of half-band filter（HBn-1）Input, (n-1)th grade of half-band filter（HBn-1）Output be used as the n-th -2 series
According to selector（Muxn-2）One input, the n-th -2 DBMS selector（Muxn-2）Another input for integral multiple extract mould
Block B input signal, is cascaded successively, finally by the 0th DBMS selector（Mux0）Output be used as integral multiple abstraction module B's
Output signal.
Specifically, for integral multiple interpolation modules A, internal half-band filter（HB）Total number by minimum input it is pending
The symbol rate of sequence is sent to be determined with target sampling rate fs_u ratio；For integral multiple abstraction module B, internal half-band filter
（HB）Total number determined by the bandwidth and the sample rate f s_d of ADC analog-digital converters ratio of the minimum input signal of receiving terminal.
For integral multiple interpolation modules A, the number of the described half-band filter for participating in the processing of integral multiple filtering interpolation by
The symbol rate of the sequence to be sent currently inputted is determined with target sampling rate fs_u ratio；For integral multiple abstraction module B, institute
That states participates in the number of the half-band filter of integral multiple filtering extraction processing by the symbol rate and ADC of current receiving terminal input signal
The sample rate f s_d of analog-digital converter ratio is determined.
Filtered as preferred, described fraction times interpolation modules A and fraction times interpolation module B using polynomial interopolation
Device.
Under a kind of sampling rate converting method of bandwidth continuous variable, the step of it is changed including a up-sampling rate and one
The step of sample rate is changed, described up-sampling rate conversion includes following sub-step：
S01：Formed filter receiving end/sending end needs the sequence sent, and sequence to be sent is entered with M times of fixed multiple
Row interpolation filters forming processes, is molded signal spectrum, at the same time, control module A receiving end/sending ends sequence to be sent, root
According to the symbol rate f of sequence to be sentsymbol_uWith target sampling rate fs_u ratio R _ u, the whole of integral multiple interpolation modules A is calculated
Several times interpolation multiple N_u and fraction double interpolation the multiple uk_u, ratio R _ u of fraction times interpolation modules A and integral multiple interpolation multiple
Relation between N_u, fraction double interpolation multiple uk_u is as follows：
R_u=N_u*uk_u*M,
Wherein, M is the fixation interpolation multiple of formed filter, and M typically takes 4.
As shown in figure 3, control module A input parameter is the symbol rate f of sequence to be sentsymbol_uAnd target sampling rate
Fs_u, according to proportionate relationship between the two, exports fraction double interpolation multiple uk_u and half-band filter number HB_step_u.
Half-band filter number HB_step_u and integral multiple interpolation multiple N_u relation is：N_u=2HB_step_u, therefore, control module A
Input/output relation can be expressed as：
It is to remove into that the symbol rate of sequence to be sent, which is multiplied by M, in formula
The fixation interpolation multiple of mode filter.
The specific method that control module A calculates integral multiple interpolation multiple N_u and fraction double interpolation multiple uk_u is as follows：First
Need to handle the symbol rate and the relation of target sampling rate of the sequence to be sent of minimum input, calculate the half band filter at most needed
Ripple device number, then symbol rate and the relation of target sampling rate by current sequence, determine to need to participate in work under current sign rate
Half-band filter number HB_step_u and fraction double interpolation multiple uk_u.Wherein HB_step_u is calculated using two
The mode minimum of HB_step_u power approaches the ratio of target sampling rate and current sign rate, such as target sampling rate and current symbol
The ratio of number rate is 7.5（Remove formed filter to fix after interpolation multiple）, the integral multiple interpolation multiple that minimum can be approached is
Two secondary power, thus, HB_step_u value is 2.Fraction double interpolation multiple uk_u is target sampling rate and interpolation post-sampling
The ratio of rate, because integral multiple interpolation modules A is to carry out interpolation with two multiple, thus fraction double interpolation multiple uk_u is then 1
An arbitrary value between~2, by taking precedent as an example, ratio for 7.5 target sampling rate of the interpolation multiple after 4 times of interpolations with
Sample rate ratio after integral multiple interpolation is 1.875, thus, fraction double interpolation multiple uk_u value is 1.875.
The interpolation multiple of formed filter is fixed as M times of interpolation, by wave filter normalize design, input sampling rate with it is defeated
It is M times of relation to go out sample rate constant, thus formed filter parameter will not become with the change of sequence symbol rate to be sent
Change.
S02：Integral multiple interpolation modules A receives the data after formed filter processing, the integer provided according to control module A
Times interpolation multiple N_u, needs to participate in the half-band filter that integral multiple filtering interpolation is handled by internal data selector selection,
The sample rate of the data of reception is up-sampled to the incoming frequency scope of fraction times interpolation requirement.
Integral multiple interpolation modules A realizes the integral multiple interpolation processing of data, the side cascaded by multi-level semi-band filter
Formula can realize the integral multiple interpolation of larger multiple.Selection amount of calculation is common FIR filter amount of calculation half, and compared to
Cic filter gain is filter cell based on 0 half-band filter, and every grade of half-band filter realizes 2 integral number power
Interpolation.Carry out every time be 2 times of interpolation processing, optional sign rate in the case of, the relative passband of half-band filter, stopband band
Width is equal, thus the coefficient of half-band filter will not change with the change of symbol rate.Integral multiple interpolation modules A
Theory diagram as shown in figure 4, integral multiple interpolation modules A carry out data processing when, first by control module A determines at most needs
The number n of half-band filter, and need to participate in the number HB_step_u, parameter HB_ of the half-band filter of work every time
Step_u determines the half-band filter number for participating in calculating and every DBMS selector（Mux）It is selection input signal or choosing
Select upper level half-band filter（HB）Output., it is necessary to which three half-band filters participate in filtering, together when such as HB_step_u is 3
When, third level data selector（Mux3）It regard selection input signal as the output of the selector, remainder data selector（Mux2、
Mux1And Mux0）The output of selection upper level half-band filter gives next stage semi-band filtering as the output of data selector
Device, can so ensure there are three half-band filter participation work.
The integral multiple interpolation multiple N_u that control module A is calculated should be two integral number power, and integral multiple interpolation modules A
The number for the half-band filter that integral multiple filtering interpolation is handled is participated according to the interval selection of integral multiple interpolation multiple N_u value,
When such as N_u is 8, there will be three half-band filters to participate in filtering interpolations work.
S03：The fraction double interpolation multiple uk_u that fraction times interpolation modules A is provided according to control module A, to integral multiple interpolation
Data after modules A processing carry out the interpolation processing of fraction times, make integral multiple interpolation modules A handle after data sample rate by
Sample rate after integral multiple conversion is changed to target sampling rate.
Fraction double interpolation multiple uk_u is any fraction between 1~2, and fraction times interpolation modules A is output as target and adopted
Sample rate, and target sampling rate is no more than twice of the sample rate for the signal that integral multiple interpolation modules A is exported.
Sampling rate conversion signal when fraction times interpolation modules A uses fraction double interpolation wave filter is shown as shown in Figure 5
Figure, the sample rate f s_int of input is the sample rate after the processing of integral multiple interpolation modules A, and fs_u is target sampling rate,
By foregoing control module A analysis, the fraction double interpolation multiple uk_u of feeding fraction times interpolation modules A is target sampling rate
The ratio of the sample rate exported with integral multiple interpolation modules A, is expressed as：
S04：The data that DAC digital analog converters are transmitted to fraction times interpolation modules A carry out digital-to-analogue conversion, and export analog domain
Data.Specifically, DAC digital analog converters are operated in identical clock frequency under any symbol rate, so, it can cause
The bandwidth of follow-up analog filter keeps constant, reduces the pressure of analog device signal transacting.
So far, up-sampling rate transfer process is completed.
Described down-sampling rate conversion includes following sub-step：
S11：ADC analog-digital converters receive the signal Jing Guo radio frequency analog domain front-end processing, the input to optional sign rate
Signal is sampled with fixed sample rate fs_d, and input signal is transformed into numeric field by analog domain, wherein, input signal band
The wide relation with ADC fixed sample rates fs_d meets nyquist sampling theorem.At the same time, control module B receives input letter
Number, according to bandwidth parameter f and ADC the sampling rate parameter fs_d of input signal, the fraction for calculating fraction times interpolation module B is inserted again
It is worth multiple uk_d and integral multiple abstraction module B integral multiple extracting multiple N_d, makes ADC sample rate and input signal bandwidth
Ratio is R_d, then the relation between ratio R _ d and fraction double interpolation multiple uk_d, integral multiple extracting multiple N_d is as follows：
Wherein, N is multiple of the sample rate with current input signal symbol rate for the signal that integral multiple abstraction module B is exported
Value.
As shown in fig. 6, control module B input parameter is adopted for the fixation of bandwidth f and the ADC analog-digital converter of input signal
Sample rate fs_d, according to proportionate relationship between the two, exports fraction double interpolation multiple uk_d and half-band filter number HB_
Step_d, half-band filter number HB_step_d and integral multiple extracting multiple N_d relation is：N_d=2HB_step_d, control mould
Relation between block B input/output argument is：
Control module B calculation is：First according to the bandwidth of input signal and the relation of target sampling rate, it is determined that point
Several times interpolation module B output sampling rate, the sample rate is the sample rate closest to 2 integral number power of incoming symbol rate, from
And can determine that fraction double interpolation multiple uk_d is any fraction between 1~2, and size determines by current input symbol rate.
When calculating integral multiple extracting multiple N_d, the minimum signal bandwidth handled as needed and the fixed sample rate of ADC analog-digital converters
Fs_d relation, it is determined that the number of the half-band filter needed altogether, bandwidth and ADC moduluses further according to current input signal turn
The relation of parallel operation sample rate determines the half-band filter number HB_step_d for being currently needed for participating in extracting.
S12：The fraction double interpolation multiple uk_d that fraction times interpolation module B is provided according to control module B, to the numeral of reception
Signal carries out filtering interpolation processing, and the input sampling rate of the module is the sample frequency of ADC analog-digital converters, the signal of output
Sample rate is the integral multiple of input signal symbol rate.
Fraction times interpolation module B input sampling rates are the sample rate of ADC analog-digital converters, and output sampling rate is symbol rate
Two integer power times, and output sampling rate is no more than 2 times of input sampling rate.Fraction times interpolation module B turns with up-sampling rate
The structure for changing unit mid-score times interpolation modules A is identical.
S13：The integral multiple extracting multiple N_d that integral multiple abstraction module B is provided according to control module B, passes through internal number
The half-band filter number HB_step_d for needing to participate in the processing of integral multiple filtering extraction is selected according to selector, to fraction double interpolation
Signal after processing carries out integral multiple extraction processing, and output sampling rate is N times of signal of current input signal symbol rate, this
The reason for being multiplied by N in integral multiple extracting multiple N_d in the relational expression for being above-mentioned R_d, N typically takes 4.
Integral multiple abstraction module B is to be participated according to integral multiple extracting multiple N_d interval selection at integral multiple filtering extraction
The half-band filter number HB_step_d of reason, when such as N_d is 8, will have three half-band filters to participate in filtering extraction.
Integral multiple abstraction module B is identical with the structure of integral multiple interpolation modules A in up-sampling rate converting unit, is also by many
The individual half-band filter mutually cascaded is constituted.Each half-band filter can realize 2 times of signal extraction, thus D semi-band filtering
Device can realize the extraction processing of 2 D powers times, and D is determined by ADC analog-digital converters sample rate with minimum signal bandwidth.Selection ginseng
With the selection of the process and integral multiple interpolation modules A in up-sampling rate converting unit of the number of the half-band filter of extraction work
Journey is similar.
S14：Signal after matched filter is handled integral multiple extraction is filtered processing, exports filtered signal.
Matched filter is corresponding with formed filter, and root raised cosine filter may be selected, but herein, root raised cosine filter is not done
Extract or interpolation processing, only carry out the filtering of signal.
So far, down-sampling rate transfer process is completed.
Further, described fraction times interpolation modules A and fraction times interpolation module B are by the way of polynomial interopolation
Realize that fraction double interpolation is handled, the formula of polynomial interopolation is as follows：
Wherein, lk(x) it is basic point xiN Interpolation-Radix-Function (i=0,1 ... n), x is to need the position of interpolation point,
It is accumulated value not in the same time by interval of uk_d to correspond in device, lk(x) it is the value after interpolation.
The implementation process of the present invention is further illustrated exemplified by above sample rate conversion below.
Assuming that software radio transmitting terminal, the range of symbol rates of the sequence of transmission is 128KHz~16MHz, is currently needed for hair
The sequence symbol rate penetrated is 1.2MHz, and the fixation target sampling rate that need to be reached is 64MHz, is changed using the up-sampling rate of the present invention
Unit and up-sampling rate conversion method, then each module need the parameter configured to be：Control module A configures the interpolation that each module needs
Multiple, the number for the half-band filter that integral multiple interpolation modules A needs altogether is determined according to the scope of list entries.List entries
Range of symbol rates be 128KHz~16MHz, after 4 times of interpolations that formed filter is fixed, send into integral multiple interpolation modules A
Sample rate scope be 512KHz~64MHz, namely interpolation multiple be 0~125, maximum interpolation multiple be 125 times, it is necessary to 6
Half-band filter.When incoming symbol rate is 1.2MHz, the sample rate after molding filtration is 4.8MHz, to reach destination sample
The interpolation multiple that rate needs is 64MHz/4.8MHz=13.3333 times, and 2 integral number power that minimum approaches interpolation multiple is 8, HB_
Step_u is set to 3.The output of formed filter is by third level data selector（Mux3）Into integral multiple interpolation modules A, warp
The output sampling rate for crossing integral multiple interpolation modules A after 8 times of interpolation is 4.8*8=38.4MHz.Further calculate fraction times interpolation
Fraction double interpolation multiple uk_u=64/38.4=1.6667 times of modules A.
Claims (10)
1. a kind of sample rate conversion equipment of bandwidth continuous variable, it is characterised in that：It is adopted by up-sampling rate converting unit with
Sample rate converting unit is constituted；
Up-sampling rate converting unit includes formed filter, integral multiple interpolation modules A, fraction times interpolation modules A, DAC digital-to-analogues and turned
Parallel operation and control module A, formed filter are used for the sequence that receiving end/sending end needs to send, and to fix multiple to sequence to be sent
Row carry out filtering interpolation processing, complete the spectral shaping of sequence to be sent；The signal output part of formed filter passes sequentially through whole
Several times interpolation modules A and fraction times interpolation modules A are connected with DAC digital analog converters, integral multiple interpolation modules A be used for frequency spectrum into
Data after type carry out the interpolation processing of two integer power times, by the sampling rate conversion of data to fraction times interpolation modules A
Interpolation process range；Fraction times interpolation modules A is used to carry out fraction double interpolation processing to the data after the processing of integral multiple interpolation, makes
The sample rate of output data is target sampling rate；DAC digital analog converters are responsible for the data after sampling rate conversion carrying out numeric field
To the conversion of analog domain, and output sampling rate is the data of target sampling rate；Control module A control signal output respectively with
Integral multiple interpolation modules A is connected with the control signal input of fraction times interpolation modules A, and control module A is used for according to input
The symbol rate of sequence to be sent and the proportionate relationship of target sampling rate, calculate the integral multiple interpolation multiple of integral multiple interpolation modules A,
And the fraction double interpolation multiple of fraction times interpolation modules A；
Down-sampling rate converting unit includes ADC analog-digital converters, fraction times interpolation module B, integral multiple abstraction module B, matching filter
Ripple device and control module B, ADC analog-digital converter are used in receiving terminal, and mould is carried out to the analog signal of input with fixed sample rate
Near-field is to the conversion of numeric field, and the digital signal output end of ADC analog-digital converters passes sequentially through fraction times interpolation module B and integer
Times abstraction module B is connected with matched filter；Fraction times interpolation module B receives the data signal of ADC analog-digital converters output, and
Data signal to reception carries out filtering interpolation processing, the sample rate of the data of fraction times interpolation module B outputs is believed for input
The integral multiple of number symbol rate；Integral multiple abstraction module B is used to carry out the data after the processing of fraction times interpolation two power
The integral multiple extraction processing of side, and output sampling rate is M times of signal of input signal symbol rate, M is a fixed value；Matching filter
Ripple device is used for the signal after handling extraction and carries out matched filtering；Control module B is used for bandwidth and ADC moulds according to input signal
The relation of number converter sample rate, calculates integral multiple abstraction module B integral multiple extracting multiple, and fraction times interpolation module B
Fraction double interpolation multiple.
2. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 1, it is characterised in that：Described is whole
Several times interpolation modules A is similar with integral multiple abstraction module B structure, is cascaded by multiple half-band filters and multiple data selectors
Form, interpolation or the extraction of two n powers times can be realized, wherein, n is the half-band filter number of cascade, data selector use
The processing of integral multiple filtering interpolation is participated in control or participates in the number for the half-band filter that integral multiple filtering extraction is handled；
For integral multiple interpolation modules A, the output signal after formed filter molding filtration is used as the defeated of integral multiple interpolation modules A
Enter signal, the input of n-th grade of half-band filter is directly the input signal of integral multiple interpolation modules A, n-th grade of half-band filter
An input as the (n-1)th DBMS selector is exported, another input of the (n-1)th DBMS selector is integral multiple interpolation
The input signal of modules A, the output of the (n-1)th DBMS selector as (n-1)th grade of half-band filter input, (n-1)th grade half
The output of band filter is inputted as one of the n-th -2 DBMS selector, and another input of the n-th -2 DBMS selector is
The input signal of integral multiple interpolation modules A, is cascaded successively, is finally used as integral multiple interpolation by the output of the 0th DBMS selector
The output signal of modules A；
For integral multiple abstraction module B, fraction times interpolation module B output signal is believed as integral multiple abstraction module B input
Number, the input of n-th grade of half-band filter is directly integral multiple abstraction module B input signal, the output of n-th grade of half-band filter
As an input of the (n-1)th DBMS selector, another input of the (n-1)th DBMS selector is integral multiple abstraction module
B input signal, the output of the (n-1)th DBMS selector is used as the input of (n-1)th grade of half-band filter, (n-1)th grade of half band filter
The output of ripple device is as an input of the n-th -2 DBMS selector, and another input of the n-th -2 DBMS selector is integer
Times abstraction module B input signal, cascades, is finally used as integral multiple abstraction module B by the output of the 0th DBMS selector successively
Output signal.
3. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 2, it is characterised in that：For integer
Times interpolation modules A, the total number of internal half-band filter by minimum input sequence to be sent symbol rate and target sampling rate
Ratio determine；For integral multiple abstraction module B, the total number of internal half-band filter by the minimum input signal of receiving terminal band
The ratio of the wide sample rate with ADC analog-digital converters is determined.
4. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 2, it is characterised in that：For integer
Times interpolation modules A, the number of the half-band filter of described participation integral multiple filtering interpolation processing is to be sent by what is currently inputted
The symbol rate of sequence and the ratio of target sampling rate are determined；For integral multiple abstraction module B, described participation integral multiple extracts filter
The number of the half-band filter of ripple processing by current receiving terminal input signal symbol rate and ADC analog-digital converters sample rate
Ratio is determined.
5. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 1, it is characterised in that：Described control
Modules A processed is by the way of software control, and control module B also by the way of software control, realizes that hardware circuit is difficult realization
Division arithmetic processing.
6. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 1, it is characterised in that：Described point
Several times interpolation modules A and fraction times interpolation module B use polynomial interopolation wave filter.
7. a kind of sample rate conversion equipment of bandwidth continuous variable according to claim 1, it is characterised in that：It is described into
Mode filter uses root raised cosine filter.
8. a kind of sampling rate converting method of bandwidth continuous variable, it is characterised in that：It includes the step of a up-sampling rate conversion
A step of rapid and down-sampling rate is changed, described up-sampling rate conversion includes following sub-step：
S01：Formed filter receiving end/sending end needs the sequence sent, and sequence to be sent is inserted with M times of fixed multiple
Value filtering forming processes, are molded signal spectrum, at the same time, control module A receiving end/sending ends sequence to be sent, according to treating
The symbol rate of sequence and ratio R _ u of target sampling rate are sent, the integral multiple interpolation multiple N_ of integral multiple interpolation modules A is calculated
U and fraction double interpolation the multiple uk_u, ratio R _ u of fraction times interpolation modules A and integral multiple interpolation multiple N_u, fraction double interpolation
Relation between multiple uk_u is as follows：
R_u=N_u*uk_u*M,
Wherein, M is the fixation interpolation multiple of formed filter；
S02：Integral multiple interpolation modules A receives the data after formed filter processing, and the integral multiple provided according to control module A is inserted
It is worth multiple N_u, needs to participate in the half-band filter that integral multiple filtering interpolation is handled by internal data selector selection, will connect
The sample rate of the data of receipts is up-sampled to the incoming frequency scope of fraction times interpolation requirement；
S03：The fraction double interpolation multiple uk_u that fraction times interpolation modules A is provided according to control module A, to integral multiple interpolation module
Data after A processing carry out the interpolation processing of fraction times, make the sample rate of the data after the processing of integral multiple interpolation modules A by integer
Sample rate after converting again is changed to target sampling rate；
S04：The data that DAC digital analog converters are transmitted to fraction times interpolation modules A carry out digital-to-analogue conversion, and export the number of analog domain
According to；
So far, up-sampling rate transfer process is completed；
Described down-sampling rate conversion includes following sub-step：
S11：ADC analog-digital converters receive the signal Jing Guo radio frequency analog domain front-end processing, to the input signal of optional sign rate
Sampled with fixed sample rate fs_d, input signal is transformed into numeric field by analog domain, at the same time, control module B connects
Input signal is received, according to bandwidth parameter f and ADC the sampling rate parameter fs_d of input signal, calculates fraction times interpolation module B's
Fraction double interpolation multiple uk_d and integral multiple abstraction module B integral multiple extracting multiple N_d, the sample rate and input for making ADC is believed
The ratio of number bandwidth is R_d, then the relation between ratio R _ d and fraction double interpolation multiple uk_d, integral multiple extracting multiple N_d is such as
Under：
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<mo>=</mo>
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<mo>(</mo>
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Wherein, N is multiple value of the sample rate with current input signal symbol rate for the signal that integral multiple abstraction module B is exported；
S12：The fraction double interpolation multiple uk_d that fraction times interpolation module B is provided according to control module B, to the data signal of reception
Filtering interpolation processing is carried out, the sample rate for making the signal of output is the integral multiple of input signal symbol rate；
S13：The integral multiple extracting multiple N_d that integral multiple abstraction module B is provided according to control module B, is selected by internal data
Selecting device selection needs to participate in the half-band filter number HB_step_d of integral multiple filtering extraction processing, to fraction double interpolation processing
Signal afterwards carries out integral multiple extraction processing, and output sampling rate is M times of signal of current input signal symbol rate, and M is one solid
Definite value, the relation between half-band filter number HB_step_d and integral multiple extracting multiple N_d is as follows：
N_d=2HB_step_d；
S14：Signal after matched filter is handled integral multiple extraction is filtered processing, exports filtered signal；
So far, down-sampling rate transfer process is completed.
9. a kind of sampling rate converting method of bandwidth continuous variable according to claim 8, it is characterised in that：Described point
Several times interpolation modules A and fraction times interpolation module B realize that fraction double interpolation is handled by the way of polynomial interopolation, multinomial
The formula of interpolation is as follows：
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Wherein, lk(x) it is basic point xiN Interpolation-Radix-Function, i=0,1 ... n, x are to need the position of interpolation point, correspondence
It is the accumulated value not in the same time by interval of uk_d, l into devicek(x) it is the value after interpolation.
10. a kind of sampling rate converting method of bandwidth continuous variable according to claim 8, it is characterised in that：Described
DAC digital analog converters are operated in identical clock frequency under any symbol rate.
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| WO2019152458A1 (en) * | 2018-02-01 | 2019-08-08 | Cirrus Logic International Semiconductor Ltd. | Active noise cancellation (anc) system with selectable sample rates |
| CN109655644B (en) * | 2018-12-26 | 2021-04-13 | 中电科思仪科技股份有限公司 | Method and device for reducing random wave signal output jitter |
| CN109976660B (en) * | 2019-02-25 | 2022-08-12 | 安徽白鹭电子科技有限公司 | Random signal sampling rate reconstruction method based on linear interpolation and data sampling system |
| CN110290081B (en) * | 2019-06-27 | 2022-03-25 | 北京润科通用技术有限公司 | Baseband signal processing method and device |
| CN112350739B (en) * | 2019-08-06 | 2022-03-15 | 天津光电通信技术有限公司 | Method for acquiring channel signal with variable bandwidth and variable bandwidth channelization system |
| CN113037430B (en) * | 2019-12-25 | 2022-11-22 | 北京东土科技股份有限公司 | Sampling rate conversion method, device, equipment and storage medium |
| CN112067869A (en) * | 2020-09-15 | 2020-12-11 | 中电科仪器仪表有限公司 | Digital filtering device and method for oscilloscope bandwidth limitation |
| CN113691475B (en) * | 2021-08-25 | 2022-07-08 | 湖南迈克森伟电子科技有限公司 | OOK demodulation circuit |
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