CN106301232B - A kind of Multicenter digital up-conversion system and method - Google Patents
A kind of Multicenter digital up-conversion system and method Download PDFInfo
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Abstract
The present invention relates to a kind of Multicenter digital up-conversion system and method, which includes: that preprocessing module, Fourier remove frequency module, combining module and real modulated signal and obtain module: preprocessing module is used for will be per waiting for the corresponding default frequency point of frequency variation signal and export processing result to remove frequency module to Fourier to the road centre frequency Ban Pinzhigai of frequency variation signal all the way；Fourier removes frequency module and is used for each road signal while carrying out inverse Fourier transform so that the centre frequency of each road signal is removed frequency to corresponding target frequency point；And processing result is exported and gives combining module；Combining module is used to after each road signal is carried out an interpolation filtering be combined, and processing result is exported and obtains module to real modulated signal；Real modulated signal obtains module and is used to export real modulated signal to after the signal progress quadratic interpolation filtering after combining, then after carrying out orthogonal modulation.The system provided through the invention can save hardware resource.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of Multicenter digital up-conversion system and methods.
Background technique
Digital frequency conversion technology is to be moved that (this process can using frequency spectrum of the Digital Signal Processing to the signal of input
Referred to as remove frequency), and Digital Up Convert then refers in particular to from low-frequency range move the frequency spectrum of the signal of input to high band, in order to
It is transmitted in band communication channel.Digital Upward Frequency Conversion Technology is widely used in the digital modulation system in the communications field.Numerically
Converter technique is related to interpolation filtering, complex modulation and orthogonal modulation, in which: the effect of interpolation filtering is to improve adopting for signal
Sample rate, and filter out mirror image ingredient；Complex modulation has been used for pair signals multiplied by the processing of a complex carrier signal, to realize that frequency spectrum is removed
It moves；And orthogonal modulation is then to take out signal multiplied by the real part in the result of complex carrier signal, to realize frequency spectrum shift and obtain
Real modulated signal.
Generally there is the signal on the road M (i.e. M channel) to input in existing multi-channel digital up-conversion, a real modulated signal
Output.(centre frequency of signal as described below refers both in the frequency spectrum of signal the centre frequency of the frequency spectrum to frequency variation signal on the road M
Frequency of heart) be located at zero-frequency at, by Multicenter digital up-conversion system carry out up-conversion after, i-th road (i=1,2 ..., M) to
The centre frequency of frequency variation signal will be located at final goal frequency point (i.e. f corresponding with the signali(i=1,2 ..., M)) at, and M
Signal of the road after up-conversion will be combined into a real modulated signal and be exported, wherein M indicates number of active lanes, for greater than 1
Positive integer.
Fig. 1 is a kind of existing Multicenter digital up-conversion system, which realizes number using the method that two-stage removes frequency
Up-conversion.As shown in fig. 1, it is carried out to corresponding to frequency variation signal first with first order interpolation filter and complex modulator
The first order removes frequency, and after removing frequency, the centre frequency of the signal on i-th road (i=1,2 ..., M) is located at corresponding target frequency point
(i.e. (fi-f0)) at；Later, it after Jiang Gelu is directly combined addition by the signal for removing frequency to corresponding target frequency point, then carries out
Second level interpolation filtering, the sample rate of promotion signal；Second most is carried out to filtered signal through second level quadrature modulator afterwards
Grade removes frequency, and exports after obtaining real modulated signal.
However above-mentioned Digital Up Convert system, each first order interpolation filter and complex modulator are that realization will be wait become
Frequency signal removes frequency to target frequency point, needs to consume a large amount of hardware resource.
Summary of the invention
The object of the present invention is to provide a kind of Multicenter digital up-conversion system and methods, are consumed in the related technology with overcoming
The problem of a large amount of hardware resource.
On the one hand, the present invention provides a kind of Multicenter digital up-conversion system, including preprocessing module, and Fourier removes frequency mould
Block, combining module and real modulated signal obtain module, in which:
The preprocessing module, for waiting for frequency variation signal pair to the road centre frequency Ban Pinzhigai of frequency variation signal all the way for every
The default frequency point answered, and will treated that signal exports removes frequency module to the Fourier, wherein default frequency point meets following item
Part: centre frequency is in the signal all the way of default frequency point after inverse Fourier transform, and the centre frequency of the road signal up-converts to
The corresponding target frequency point of the road signal；
The Fourier removes frequency module, and each road signal for centre frequency to be in default frequency point carries out Fourier simultaneously
The centre frequency of each road signal is removed frequency to corresponding target frequency point by inverse transformation；And each road signal exports by treated
To the combining module；
The combining module carries out an interpolation filtering for the Fourier to be removed each road signal that frequency module is sent
After be combined, and the signal after combining is exported and obtains module to the real modulated signal；
The reality modulated signal obtains module, after carrying out quadratic interpolation filtering to the signal after the combining, then into
Row orthogonal modulation, and export real modulated signal.
On the one hand, the present invention provides a kind of multi-channel digital up-conversion method, comprising:
The corresponding default frequency point of frequency variation signal is waited for the road centre frequency Ban Pinzhigai of frequency variation signal all the way by every, wherein
Default frequency point meets following condition: centre frequency is in the signal all the way of default frequency point after inverse Fourier transform, the road signal
Centre frequency up-convert to the corresponding target frequency point of the road signal；
Each road signal that centre frequency is in default frequency point is subjected to inverse Fourier transform simultaneously, it will be in each road signal
Frequency of heart removes frequency to corresponding target frequency point；
It is combined after each road signal for removing frequency to corresponding target frequency point is carried out an interpolation filtering；
After carrying out quadratic interpolation filtering to the signal after the combining, then orthogonal modulation is carried out, and export real modulated signal.
The present invention, which at least has the advantages that, expends more hardware based on existing in existing Digital Up Convert system
The problem of resource, the embodiment of the present invention provide a kind of Multicenter digital up-conversion system, on multi-channel digital provided by the invention
Frequency conversion system is based on inverse Fourier transform and realizes up-conversion, for saving hardware resource.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
Fig. 1 is the schematic diagram of Multicenter digital up-conversion system in the prior art；
Fig. 2 is one of the schematic diagram of Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 3 is the two of the schematic diagram of the Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 4 is the schematic diagram of the preprocessor of the Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 5 is the schematic diagram of the delay adder of the Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 6 is the three of the schematic diagram of the Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 7 is that frequency device schematic diagram is removed in the Fourier channel of the Multicenter digital up-conversion system in the embodiment of the present invention；
Fig. 8 is that the schematic diagram that the branch in frequency device removes frequency device is removed in the Fourier channel in the embodiment of the present invention；
Fig. 9 is the schematic diagram carried out after poly phase to Fig. 8 in the embodiment of the present invention；
Figure 10 is to carry out transformed schematic diagram according to Noble identity to Fig. 9 in the embodiment of the present invention；
Figure 11 is the schematic diagram of the complex modulator and multiphase filter in the embodiment of the present invention in Figure 10；
Figure 12 is to remove frequency device using the Fourier channel shown in Fig. 7 after inverse discrete Fourier transform in the embodiment of the present invention
Schematic diagram；
Figure 13 is the exemplary process diagram of the multi-channel digital up-conversion method in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is illustrated below in conjunction with attached drawing, it should be understood that embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Based on there is the more hardware resource of consuming in existing Digital Up Convert system, the embodiment of the present invention is provided
A kind of Multicenter digital up-conversion system, Multicenter digital up-conversion system provided by the invention are realized based on inverse Fourier transform
Up-conversion, for saving hardware resource.Certainly, in order to improve the efficiency of up-conversion, inverse Fourier transform can be using discrete fast
Fast inverse Fourier transform.The design principle of Multicenter digital up-conversion system provided in an embodiment of the present invention is carried out below detailed
Explanation.
Firstly, it is necessary to again it is clear that target frequency point to frequency variation signal, is to frequency variation signal by system shown in Figure 1
First order interpolation filter and complex modulator after centre frequency；And the final goal frequency point to frequency variation signal is to frequency conversion
Centre frequency after second level quadrature modulator of the signal by system shown in Figure 1.So target frequency point and final goal frequency point
It is different concept.Such as signal I, the final goal frequency point of the signal is fi, then the target frequency point of the signal is (fi-
f0)。
In Multicenter digital up-conversion system provided in an embodiment of the present invention, the last one is treated at frequency variation signal
The module of reason is that real modulated signal obtains module, and the function of the module is equal to the second level interpolation filtering in system shown in Figure 1
Device and second level quadrature modulator.So in embodiments of the present invention, unlike system shown in Figure 1, the embodiment of the present invention
It is merely able to that the centre frequency to frequency variation signal is made to reach target frequency point by inverse Fourier transform.
And in practical applications, inverse Fourier transform can not will remove frequency to any frequency point to frequency variation signal, so, to
It realizes and up-conversion is carried out using the method for inverse Fourier transform, then being carried out firstly the need of the centre frequency for treating frequency variation signal pre-
Processing, in order to this after frequency variation signal after inverse discrete Fourier transform, can accurately reach corresponding target frequency point.
Based on above-mentioned design, the schematic diagram of Multicenter digital up-conversion system provided by the invention is as shown in Fig. 2, this is
System includes preprocessing module 201, and Fourier removes frequency module 202, combining module 203 and real modulated signal and obtains module 204,
In:
The preprocessing module 201, for waiting for that frequency conversion is believed to the road centre frequency Ban Pinzhigai of frequency variation signal all the way for every
Number corresponding default frequency point, and will treated that signal exports removes frequency module to the Fourier, wherein default frequency point meets such as
Lower condition: centre frequency is in the signal all the way of default frequency point after inverse Fourier transform, becomes in the centre frequency of the road signal
The corresponding target frequency point of the road Pin Weigai signal；
The Fourier removes frequency module 202, and each road signal for centre frequency to be in default frequency point carries out Fu simultaneously
In leaf inverse transformation, the centre frequency of each road signal is removed into frequency to corresponding target frequency point；And it will treated each road signal
It exports to the combining module；
The combining module 203 carries out an interpolation for the Fourier to be removed each road signal that frequency module is sent
It is combined after filtering, and the signal after combining is exported and obtains module to the real modulated signal；
The reality modulated signal obtains module 204, after carrying out quadratic interpolation filtering to the signal after the combining, then
Orthogonal modulation is carried out, and exports real modulated signal.
Multicenter digital up-conversion system provided in an embodiment of the present invention for ease of understanding, is specifically described below.
1), for preprocessing module 201:
Wherein, in one embodiment, as shown in figure 3, the preprocessing module, specifically includes:
Primary complex modulator 205, channel to channel adapter 206 and preprocessor 207, in which:
The primary complex modulator 205, for waiting becoming by the road according to formula (1) to frequency variation signal all the way for every
The corresponding level-one conversion frequencies of frequency variation signal are waited on the road centre frequency Ban Pinzhigai of frequency signal, then export processing result to logical
Track selector；
fi'=(fi-f0)-li·Δf (1)
In formula (1):
li=round ((fi-f0)/Δf)；
Wherein, i indicates the i-th road signal；fiIndicate final goal frequency point of the road signal after up-converter system；(fi-
f0) indicate target frequency point；Round indicates floor operation；M indicates total number to frequency variation signal；Δ f indicates needed frequency conversion letter
Number final goal frequency point between minimum frequency absolute value of the difference；N indicates total number after expanding.
Wherein, wherein f0Value without special constraint, but for the considerations of saving resource and reducing cost, f0Value need
Positioned at f0' near, wherein f0' solution formula such as formula (2):
In formula (2), i indicates the i-th road signal；J indicates jth road signal；fiIndicate the i-th road signal by up-conversion system
Final goal frequency point after system；fjIndicate final goal frequency point of the jth road signal after up-converter system；M is indicated to frequency conversion
Total number of signal.
Preferably, multichannel can share a primary complex modulator after frequency variation signal after parallel-serial conversion.By one
Each road is waited for that the corresponding level-one frequency conversion frequency of frequency variation signal is waited on the road centre frequency Ban Pinzhigai of frequency variation signal by primary complex modulator
Rate, so compared with the existing technology in per signal all the way a corresponding first order interpolation filter and complex modulator, Neng Goushi
The multiplexing of existing primary complex modulator, to further save hardware resource.
It certainly, can also be with a primary complex modulator corresponding per signal all the way, because to frequency conversion in the embodiment of the present invention
Signal is level-one conversion frequencies by the centre frequency of primary complex modulator, which is less than the target that frequency variation signal is waited on the road
Frequency, so, primary complex modulator, which carries out the hardware resource consumption needed for removing frequency according to formula (1), will be much smaller than the prior art
In first order interpolation filter and complex modulator hardware resource consumption.
The channel to channel adapter 206 is exported for what is sent for the primary complex modulator per signal behavior all the way
Channel, and when described when total number of frequency variation signal is not 2 power side, at least 0 signal described will be believed to frequency conversion all the way
Number total number be extended for 2 power side, then by expand number after signal export correspondingly to each pretreatment
Device；
Wherein, preferably, the number after expanding is the smallest number of difference with total number to frequency variation signal.For example,
Total number to frequency variation signal is 3, then total number after expanding is 4；Total number to frequency variation signal is 5, then total after expanding
Number is 8；Total number to frequency variation signal is 7, then total number after expanding also is 8, and so on.
Wherein, if total number to frequency variation signal is M, total number after expanding number is N, is passed through then wherein M is a
Output signal it is identical as the signal in M channel of input, and the output signal in remaining N-M channel is then 0.
Wherein, in one embodiment, the channel to channel adapter 206 is used to be that the primary plural number is adjusted according to following methods
Every signal behavior output channel all the way that device processed is sent:
Firstly, enabling+1 channel of kth export the i-th road signal according to formula (2):
K=(li+N)modN (3)
Wherein, in formula (3):
li=round ((fi-f0)/Δf)
Wherein, i indicates the i-th road signal；fiIndicate final goal frequency point of the road signal after up-converter system；(fi-
f0) indicate target frequency point；Round indicates floor operation；M indicates total number to frequency variation signal；Δ f indicates needed frequency conversion letter
Number final goal frequency point between minimum frequency absolute value of the difference；N indicates total number after expanding.
The preprocessor 207, for the road the centre frequency Ban Pinzhigai signal of corresponding signal all the way is corresponding pre-
If frequency point.
Wherein, in one embodiment, the structural schematic diagram of preprocessor is as shown in figure 4, the preprocessor 207 is used for
According to following methods by the corresponding default frequency point of the road centre frequency Ban Pinzhigai signal of corresponding signal all the way: (k+1) is a
Preprocessor for complete to input signal multiplied byCalculating, wherein θk=2 π k/N, k=0,1 ..., N-1, L=N/
D, D are the positive approximate number of N and the value of D need to guarantee that the sample rate of input signal meets nyquist sampling theorem；N indicates to expand
Total number afterwards.
2) frequency module 202, is removed for Fourier；
The module can carry out removing frequency processing with frequency variation signal is treated using discrete fast-Fourier Transform algorithm.Preferably
, frequency efficiency is removed to further increase, when using discrete fast-Fourier Transform algorithm, calculated result can not be divided by discrete
Scale factor in inverse fast Fourier transform formula.
3), for being combined module 203:
Signal can generate mirror image ingredient after carrying out interpolating sampling, to realize the filtering to the mirror image ingredient, can use more
Phase filtering technique completes the filtering to mirror image ingredient by least two multiphase filters.So as shown in Fig. 2, the combining
Module 203, specifically can include:
Multiphase filter group 208, distributor 209, delay adder 210 and reversing switch 211, in which:
The multiphase filter group 208, including at least one multiphase filter, and each multiphase filter and Fu
In the signal all the way that sends of leaf transformation module correspond；Wherein, each multiphase filter to corresponding signal all the way into
Row filtering, and filtered signal is exported to the distributor；
The distributor 209, the signal for sending the multiphase filter group are distributed to described in preset quantity
Postpone adder；
The delay adder 210 closes after at least signal postpones all the way again for what is come to distributor distribution
Road, and the signal after combining is exported to the reversing switch；
The reversing switch 211, output is to institute after the signal for sending to each delay adder carries out parallel-serial conversion
It states real modulated signal and obtains module 204.
Reasonable module 203 is described in detail below:
A, about multiphase filter 208:
Wherein, the road the N signal after expansion, is sent into N number of multiphase filter and is filtered, (m+1) a multiphase filter
Shown in the transmission function of wave device such as formula (4):
In formula (4),
Wherein h (m+rN) is denoted as the impulse response that h (n) is low-pass filter, the transmission function of this low-pass filter are as follows:
Wherein, in formula (4), NLPFor the order of low-pass filter；N indicates total number after expanding；D be N just about
The value of number and D need to guarantee that the sample rate of input signal meets nyquist sampling theorem；Z indicates transform.
B, about distributor 209:
When the preset quantity for postponing adder is L, N number of signal of input is then distributed to L delay and is added by distributor
Device.Allocation rule is as follows: it is assumed that N number of signal of distributor input is a0,a1,…,aN-1, then it is sent to D of delay adder 1
Signal is a0,aL,…,a(D-1)L, D signal for being sent to delay adder 2 is a1,aL+1,…,a(D-1)L+1, and so on, hair
D signal for giving delay adder L is aL-1,a2L-1,…,aN-1。
C, about delay adder 210:
The structural schematic diagram of one delay adder is as shown in Figure 5.Each delay adder to D signal of input according to
Delay Rules are postponed, and then combining is added.Wherein, Delay Rules are as follows: first via input signal does not postpone,；Second road is defeated
Enter 1 chronomere of signal delay；Third road input signal postpones 2 chronomeres；And so on, the road D input signal is prolonged
Slow D-1 chronomere.In Fig. 5, z-1Indicate 1 chronomere of delay, z-2Indicate 2 chronomeres of delay, z-(D-1)Table
Show delay (D-1) a chronomere.
3), real modulated signal obtains module 204:
As shown in figure 3, it includes third level interpolation filter 212, third level orthogonal modulation that real modulated signal, which obtains module 204,
Device 213, wherein；
Third level interpolation filter 212, for carrying out quadratic interpolation filtering to the signal after combining；
Third level quadrature modulator 213, for third level interpolation filter 212 carry out treated signal carry out it is orthogonal
Modulation, to obtain final real modulated signal.
To sum up, Multicenter digital up-conversion system provided in an embodiment of the present invention, is realized by using inverse Fourier transform
The frequency spectrum shift of frequency variation signal is treated, so that hardware resource can be saved compared with the prior art.
To be multiplexed below with using convenient for further understanding Multicenter digital up-conversion system provided in an embodiment of the present invention
For primary complex modulator, the design principle of the system is illustrated:
As shown in fig. 6, being the structural schematic diagram of Multicenter digital up-conversion system provided in an embodiment of the present invention, according to place
The sequencing to frequency variation signal is managed, which successively includes parallel-to-serial converter 601, primary complex modulator 602 (i.e. in Fig. 3
Primary complex modulator), channel to channel adapter 603 (i.e. channel to channel adapter 206 in Fig. 3), Fourier channel remove frequency device 604
(it integrates the pretreatment in Fig. 3 to each module between change-over switch), (the i.e. third in Fig. 3 of third level interpolation filter 605
Grade interpolation filter 212), third level quadrature modulator 606 (i.e. third level quadrature modulator 213 in Fig. 3).Based on above
It illustrates, frequency device 604 only is removed to Fourier channel here and is illustrated:
The structural schematic diagram that Fourier removes in channel frequency device 604 is as shown in Figure 7: after channel to channel adapter, there is the output of the road N signal
Frequency device is removed to Fourier channel.So, it can be understood as Fourier, which removes in channel frequency device and removes frequency device by N number of branch, to be formed, N number of branch
Superimposed rear formation signal f (n) of the road N signal for removing the output of frequency device, exports to third level interpolation filter 605.
As shown in figure 8, removing the structural schematic diagram of frequency device for a branch, in fig. 8, H (Z) indicates L times of interpolation filtering
Transmission function.
By poly phase, in Fig. 8 shown in structure be equal to structure shown in Fig. 9.In Fig. 9, preprocessor
That is the preprocessor in Fig. 3.
It, will be in Fig. 9 according to the Noble identity (Noble identities) in multi-rate digital signal processing theory
L multiplication sampling module moves to the right dotted line position (between filtering and postpone), then knot as shown in Figure 10 can be obtained
Structure block diagram, complex modulator and multiphase filter structural schematic diagram therein are as shown in figure 11.Multiphase filter in Figure 10 is
Multiphase filter in Fig. 3.
N number of branch in Fig. 7 is removed the frequency device poly phase structure shown in Fig. 9 to be replaced, and using linearly
Combining adder in Fig. 7 is moved to left complex modulator and multiphase into poly phase structure by the linear superposition theorem of system
The centre of filter branch, then another structural block diagram of frequency device is removed in available Fourier channel, i.e. ties shown in Figure 12
Structure schematic diagram.In the structure shown in Figure 12, with inverse discrete Fourier transform module instead of calculating process wherein of equal value.It is right
In inverse discrete Fourier transform, then well known discrete fast-Fourier Transform algorithm can be used quickly to be calculated, to reduce
Calculation amount reduces resource consumption and hardware cost.So far, the design principle of system provided in an embodiment of the present invention has been explained
It is bright.
Embodiment two
Based on identical inventive concept, the embodiment of the present invention also provides a kind of multi-channel digital up-conversion method, such as Figure 13
It is shown, method includes the following steps:
Step 1301: waiting for the corresponding default frequency of frequency variation signal to the road centre frequency Ban Pinzhigai of frequency variation signal all the way for every
Point, wherein default frequency point meets following condition: centre frequency is in the signal all the way of default frequency point after inverse Fourier transform,
The centre frequency of the road signal up-converts to the corresponding target frequency point of the road signal.
Step 1302: each road signal that centre frequency is in default frequency point is subjected to inverse Fourier transform simultaneously, it will be each
The centre frequency of road signal removes frequency to corresponding target frequency point.
Step 1303: being combined after each road signal for removing frequency to corresponding target frequency point is carried out an interpolation filtering.
Step 1304: after carrying out quadratic interpolation filtering to the signal after the combining, then carrying out orthogonal modulation, and export reality
Modulated signal.
Wherein, in one embodiment, step 1301 specifically includes the following steps:
Step A1: for per all the way to frequency variation signal, according to the following formula, which is waited for that the centre frequency of frequency variation signal is removed
Pin Zhigai waits on road the corresponding level-one conversion frequencies of frequency variation signal；
fi'=(fi-f0)-liΔ f,
In above formula:
li=round ((fi-f0)/Δf)；
Wherein, i indicates the i-th road signal；fi' indicate the i-th road signal level-one conversion frequencies；fiIndicate that the road signal passes through
Final goal frequency point after up-conversion method；(fi-f0) indicate target frequency point；Round indicates floor operation；M indicates to believe to frequency conversion
Number total number；Δ f indicates the minimum frequency absolute value of the difference between the final goal frequency point of needed frequency variation signal；
Step A2: to up-convert to every signal behavior output channel all the way of corresponding level-one conversion frequencies, and work as described
When total number of frequency variation signal is not 2 power side, at least 0 signal expands total number to frequency variation signal all the way
For 2 power side；
Step A3: the corresponding default frequency of the road centre frequency Ban Pinzhigai signal per signal all the way after total number will be expanded
Point.
Wherein, in one embodiment, according to following methods be up-convert to corresponding level-one conversion frequencies per all the way
Signal behavior output channel:
Firstly,+1 channel of kth is enabled to export the i-th road signal according to the following formula:
K=(li+ N) modN,
Wherein, in above formula:
li=round ((fi-f0)/Δf)
Wherein, i indicates the i-th road signal；fiIndicate final goal frequency point of the road signal after up-conversion method；(fi-
f0) indicate target frequency point；Round indicates floor operation；M indicates total number to frequency variation signal；Δ f indicates needed frequency conversion letter
Number final goal frequency point between minimum frequency absolute value of the difference；N indicates total number after expanding.
Wherein, in one embodiment, the centre frequency per signal all the way after total number being expanded according to following methods
The corresponding default frequency point of the road Ban Pinzhigai signal:
(k+1) a preprocessor for complete to input signal multiplied byCalculating, wherein θk=2 π k/N, k=
0,1 ..., N-1, L=N/D, D are the positive approximate number of N and the value of D need to guarantee that the sample rate of input signal meets Nyquist and adopts
Sample theorem, N indicate total number after expanding
Wherein, in one embodiment, step 1303 specifically includes the following steps:
Step B1: it is filtered to per signal all the way；
Step B2: the grouping of preset quantity will be divided into per signal filtered all the way；
Step B3: it is combined again after postponing to the signal of each grouping；
Step B4: parallel-serial conversion is carried out to the signal after combining and is exported to extract real modulated signal.
About each method in above-described embodiment, wherein the concrete mode of the execution operation of various method steps is related
It is described in detail in the embodiment of the system, no detailed explanation will be given here.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of Multicenter digital up-conversion system, which is characterized in that including preprocessing module, Fourier removes frequency module, combining
Module and real modulated signal obtain module, in which:
The preprocessing module, for waiting for that frequency variation signal is corresponding to the road centre frequency Ban Pinzhigai of frequency variation signal all the way for every
Default frequency point, and will treated that signal exports removes frequency module to the Fourier, wherein default frequency point meets following condition:
Centre frequency is in the signal all the way of default frequency point after inverse Fourier transform, and the centre frequency of the road signal up-converts to the road
The corresponding target frequency point of signal；
The Fourier removes frequency module, and each road signal for centre frequency to be in default frequency point carries out Fourier's inversion simultaneously
It changes, the centre frequency of each road signal is removed into frequency to corresponding target frequency point；And each road signal is exported to institute by treated
State combining module；
The combining module, it is laggard for the Fourier to be removed each road signal interpolation filtering of progress that frequency module is sent
Row combining, and the signal after combining is exported and obtains module to the real modulated signal；
The reality modulated signal obtains module, after carrying out quadratic interpolation filtering to the signal after the combining, then carries out just
Intermodulation system, and export real modulated signal.
2. system according to claim 1, which is characterized in that the preprocessing module specifically includes:
Primary complex modulator, channel to channel adapter and preprocessor group, in which:
The primary complex modulator, for according to the following formula, which being waited for frequency variation signal for per all the way to frequency variation signal
The road centre frequency Ban Pinzhigai wait for the corresponding level-one conversion frequencies of frequency variation signal, then processing result is exported to channel selecting
Device；
fi'=(fi-f0)-liΔ f,
In above formula:
li=round ((fi-f0)/Δf)；
Wherein, i indicates the i-th road signal；J indicates jth road signal；fi' indicate the i-th road signal level-one conversion frequencies；fiIndicating should
Final goal frequency point of the road signal after up-converter system；(fi-f0) indicate intermediate objective frequency point；Round indicates to be rounded behaviour
Make；M indicates total number to frequency variation signal；Δ f indicates the minimum frequency between the final goal frequency point of needed frequency variation signal
Absolute value of the difference；
The channel to channel adapter, every signal behavior output channel all the way for being sent for the primary complex modulator, and
When described when total number of frequency variation signal is not 2 power side, at least all the way 0 signal by total road to frequency variation signal
Number is extended for 2 power side, then exports the signal after expansion number correspondingly and gives each preprocessor；
The preprocessor, for by the corresponding default frequency point of the road centre frequency Ban Pinzhigai signal of corresponding signal all the way.
3. system according to claim 2, which is characterized in that the channel to channel adapter is used to according to following methods be described
Every signal behavior output channel all the way that primary complex modulator is sent:
Firstly,+1 channel of kth is enabled to export the i-th road signal according to the following formula:
K=(li+ N) modN,
Wherein, in above formula:
li=round ((fi-f0)/Δf)
Wherein, i indicates the i-th road signal；fiIndicate final goal frequency point of the road signal after up-converter system；(fi-f0) table
Show intermediate objective frequency point；Round indicates floor operation；M indicates total number to frequency variation signal；Δ f indicates needed frequency conversion letter
Number final goal frequency point between minimum frequency absolute value of the difference；N indicates total number after expanding.
4. system according to claim 2, which is characterized in that the preprocessor is used for will be corresponding according to following methods
The corresponding default frequency point of the road centre frequency Ban Pinzhigai signal of signal all the way:
(k+1) a preprocessor for complete to input signal multiplied byCalculating, wherein θk=2 π k/N, k=0,
1 ..., N-1, L=N/D, D are the positive approximate number of N and the value of D need to guarantee that the sample rate of input signal meets nyquist sampling
Theorem；N indicates total number after expanding.
5. system according to claim 1, which is characterized in that the combining module specifically includes:
Multiphase filter group, distributor, delay adder and reversing switch, in which:
The multiphase filter group, including at least one multiphase filter, and each multiphase filter is removed with the Fourier
The signal all the way that frequency module is sent corresponds；Wherein, each multiphase filter is filtered corresponding signal all the way,
And filtered signal is exported to the distributor；
The distributor, the delay that the signal for sending the multiphase filter group distributes to preset quantity are added
Device；
The delay adder is combined after at least signal postpones all the way again for what is come to distributor distribution, and will
Signal after combining is exported to the reversing switch；
The reversing switch, output is to the real modulation after the signal for sending to each delay adder carries out parallel-serial conversion
Signal acquisition module.
6. a kind of multi-channel digital up-conversion method characterized by comprising
The corresponding default frequency point of frequency variation signal is waited for the road centre frequency Ban Pinzhigai of frequency variation signal all the way by every, wherein default
Frequency point meets following condition: centre frequency is in the signal all the way of default frequency point after inverse Fourier transform, in the road signal
Frequency of heart up-converts to the corresponding target frequency point of the road signal；
Each road signal that centre frequency is in default frequency point is subjected to inverse Fourier transform simultaneously, by the center frequency of each road signal
Rate removes frequency to corresponding target frequency point；
It is combined after each road signal for removing frequency to corresponding target frequency point is carried out an interpolation filtering；
After carrying out quadratic interpolation filtering to the signal after the combining, then orthogonal modulation is carried out, and export real modulated signal.
7. according to the method described in claim 6, it is characterized in that, described remove frequency to the centre frequency of frequency variation signal all the way for every
The corresponding default frequency point of frequency variation signal is waited for the road, is specifically included:
For per all the way to frequency variation signal, according to the following formula, which is waited for that the road centre frequency Ban Pinzhigai of frequency variation signal is waited for
The corresponding level-one conversion frequencies of frequency variation signal；
fi'=(fi-f0)-liΔ f,
In above formula:
li=round ((fi-f0)/Δf)；
Wherein, i indicates the i-th road signal；J indicates jth road signal；fi' indicate the i-th road signal level-one conversion frequencies；fiIndicating should
Final goal frequency point of the road signal after up-converter system；(fi-f0) indicate intermediate objective frequency point；Round indicates to be rounded behaviour
Make；M indicates total number to frequency variation signal；Δ f indicates the minimum frequency between the final goal frequency point of needed frequency variation signal
Absolute value of the difference；
To up-convert to every signal behavior output channel all the way of corresponding level-one conversion frequencies, and work as described to frequency variation signal
When total number is not 2 power side, at least all the way 0 signal by it is described be extended for total number of frequency variation signal 2 power side；
The corresponding default frequency point of the road centre frequency Ban Pinzhigai signal per signal all the way after total number will be expanded.
8. the method according to the description of claim 7 is characterized in that being to up-convert to corresponding level-one frequency conversion according to following methods
Every signal behavior output channel all the way of frequency:
Firstly,+1 channel of kth is enabled to export the i-th road signal according to the following formula:
K=(li+ N) modN,
Wherein, in above formula:
li=round ((fi-f0)/Δf)
Wherein, i indicates the i-th road signal；fiIndicate final goal frequency point of the road signal after up-converter system；(fi-f0) table
Show intermediate objective frequency point；Round indicates floor operation；M indicates total number to frequency variation signal；Δ f indicates needed frequency conversion letter
Number final goal frequency point between minimum frequency absolute value of the difference；N indicates total number after expanding.
9. the method according to the description of claim 7 is characterized in that often believing all the way after expanding total number according to following methods
Number the corresponding default frequency point of the road centre frequency Ban Pinzhigai signal:
(k+1) a preprocessor for complete to input signal multiplied byCalculating, wherein θk=2 π k/N, k=0,
1 ..., N-1, L=N/D, D are the positive approximate number of N and the value of D need to guarantee that the sample rate of input signal meets nyquist sampling
Theorem；N indicates total number after expanding.
10. according to the method described in claim 6, it is characterized in that, frequency to each road of corresponding target frequency point that will remove is believed
Number carry out an interpolation filtering after be combined, specifically include:
It is filtered to per signal all the way；
The grouping of preset quantity will be divided into per signal filtered all the way；
It is combined again after postponing to the signal of each grouping；
Parallel-serial conversion is carried out to the signal after combining and is exported to extract real modulated signal.
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| CN110212889B (en) * | 2019-05-29 | 2020-11-13 | 北京机电工程研究所 | A digital signal sampling device and method |
| CN110855388B (en) * | 2019-11-20 | 2022-04-19 | 成都大公博创信息技术有限公司 | A kind of multi-channel parallel generation method of broadcast signal |
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| CN114024553B (en) * | 2021-09-28 | 2022-10-25 | 伟乐视讯科技股份有限公司 | Multi-channel baseband-to-radio frequency up-conversion method and system and electronic equipment |
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