CN106301232A - A kind of Multicenter digital up-conversion system and method - Google Patents

Abstract

The present invention relates to a kind of Multicenter digital up-conversion system and method, this system includes: pretreatment module, Fourier remove frequency module, close road module and real modulated signal acquisition module: pretreatment module for treating the default frequency treating that frequency variation signal is corresponding in the mid frequency Ban Pinzhigai road of frequency variation signal and result being exported and remove frequency module to Fourier by each road；Fourier removes frequency module and removes frequency to corresponding target frequency for each road signal carries out inverse Fourier transform simultaneously with the mid frequency by each road signal；And, result is exported to closing road module；Close road module after each road signal is carried out an interpolation filtering, carry out closing road, and result is exported to real modulated signal acquisition module；After real modulated signal acquisition module signal behind involutory road carries out quadratic interpolation filtering, then carry out the real modulated signal of output after orthogonal modulation.The system provided by the present invention can save hardware resource.

Description

A kind of Multicenter digital up-conversion system and method

Technical field

The present invention relates to the communications field, particularly relate to a kind of Multicenter digital up-conversion system and method.

Background technology

Digital frequency conversion technology is to utilize Digital Signal Processing that the frequency spectrum of the signal of input is moved (this Process may be simply referred to as removing frequency), Digital Up Convert then refers in particular to move the frequency spectrum of the signal of input from low-frequency range Paramount frequency range, in order to be transmitted in band communication channel.Digital Upward Frequency Conversion Technology is widely used in communication neck In digital modulation system in territory.Digital Upward Frequency Conversion Technology relates to interpolation filtering, complex modulation and positive intermodulation System, wherein: the effect of interpolation filtering is to improve the sample rate of signal, and filters mirror image composition；Plural number is adjusted System has been used for pair signals and has been multiplied by the process of a complex carrier signal, thus realizes frequency spectrum shift；Orthogonal modulation is then It is to take out the real part that signal is multiplied by the result of complex carrier signal, thus realizes frequency spectrum shift and obtain real modulation Signal.

The signal typically having M road (i.e. M passage) in existing multi-channel digital up-conversion inputs, and one Individual real modulated signal exports.The mid frequency of the frequency spectrum treating frequency variation signal on M road is (in the following stated signal Frequency of heart refers both to the mid frequency of the frequency spectrum of signal) it is positioned at zero-frequency, through Multicenter digital up-conversion system After carrying out up-conversion, i-th (i=1,2 ..., M) mid frequency treating frequency variation signal on road will be located in and this signal pair Final goal frequency (the i.e. f answered_i(i=1,2 ..., M)) place, and the signal that M road is after up-conversion will be closed Lu Chengyi real modulated signal exports, and wherein, M represents number of active lanes, for the positive integer more than 1.

Fig. 1 is existing a kind of Multicenter digital up-conversion system, and this system uses two-stage to remove the method for frequency in fact Existing Digital Up Convert.As shown in fig. 1, first with first order interpolation filter and complex modulator to right That answers treats that frequency variation signal carries out the first order and removes frequency, after removing frequency, i-th (i=1,2 ..., M) center of signal on road Frequency is positioned at corresponding target frequency (i.e. (f_i-f₀)) place；Afterwards, Jiang Gelu has been removed frequency to corresponding After the signal of target frequency directly carries out closing road addition, then carry out second level interpolation filtering, adopting of promotion signal Sample rate；Through second level quadrature modulator, filtered signal is carried out the second level after and remove frequency, and obtain real tune Export after signal processed.

But above-mentioned Digital Up Convert system, each first order interpolation filter and complex modulator are for realizing To treat that frequency variation signal is removed frequently to target frequency, and need to consume substantial amounts of hardware resource.

Summary of the invention

It is an object of the invention to provide a kind of Multicenter digital up-conversion system and method, to overcome correlation technique The problem of the substantial amounts of hardware resource of middle consumption.

On the one hand, the present invention provides a kind of Multicenter digital up-conversion system, including pretreatment module, Fu Li Leaf is removed frequency module, is closed road module and real modulated signal acquisition module, wherein:

By each road, described pretreatment module, for treating that frequency conversion is treated on the mid frequency Ban Pinzhigai road of frequency variation signal The default frequency that signal is corresponding, and the signal after processing exports and removes frequency module to described Fourier, wherein, Default frequency meets following condition: mid frequency is in a road signal of default frequency through inverse Fourier transform After, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding；

Described Fourier removes frequency module, carries out for mid frequency is in each road signal of default frequency simultaneously Inverse Fourier transform, removes frequency to corresponding target frequency with the mid frequency by each road signal；And, at general Li Houge road signal exports to described conjunction road module；

Described conjunction road module, is carried out in once for described Fourier removes frequency module transmission Lai Ge road signal Carrying out after inserting filtering closing road, the signal behind Bing Jianghe road exports to described real modulated signal acquisition module；

Described real modulated signal acquisition module, for carrying out quadratic interpolation filtering to the signal behind described conjunction road After, then carry out orthogonal modulation, and export real modulated signal.

On the one hand, the present invention provides a kind of multi-channel digital up-conversion method, including:

Each road is treated, and the default frequency that frequency variation signal is corresponding is treated on the mid frequency Ban Pinzhigai road of frequency variation signal, Wherein, default frequency meets following condition: the road signal that mid frequency is in default frequency is inverse through Fourier After conversion, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding；

Each road signal that mid frequency is in default frequency carries out inverse Fourier transform simultaneously, to be believed on each road Number mid frequency remove frequency to corresponding target frequency；

Carry out closing road by removing after the frequency each road signal to corresponding target frequency carries out an interpolation filtering；

After signal behind described conjunction road is carried out quadratic interpolation filtering, then carry out orthogonal modulation, and export real tune Signal processed.

The present invention at least has the advantages that based on there is consuming in existing Digital Up Convert system more The problem of hardware resource, the embodiment of the present invention provides a kind of Multicenter digital up-conversion system, and the present invention carries The Multicenter digital up-conversion system of confession realizes up-conversion based on inverse Fourier transform, is used for saving hardware money Source.

It should be appreciated that it is only exemplary and explanatory that above general description and details hereinafter describe , the present invention can not be limited.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of Multicenter digital up-conversion system in prior art；

Fig. 2 is one of 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 postponing 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 Fourier's passage of the Multicenter digital up-conversion system in the embodiment of the present invention removes frequency device signal Figure；

Fig. 8 be the Fourier's passage in the embodiment of the present invention remove frequency device in branch road remove frequency device schematic diagram；

Fig. 9 is the schematic diagram carried out Fig. 8 after poly phase in the embodiment of the present invention；

Figure 10 is the schematic diagram after converting Fig. 9 according to Noble identity in the embodiment of the present invention；

Figure 11 is the complex modulator in Figure 10 and the schematic diagram of multiphase filter in the embodiment of the present invention；

Figure 12 is that the Fourier shown in Fig. 7 after utilizing inverse discrete Fourier transform in the embodiment of the present invention is led to The schematic diagram of frequency device is removed in road；

Figure 13 is the exemplary process diagram of the multi-channel digital up-conversion method in the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, embodiments of the invention are illustrated, it will be appreciated that enforcement described herein Example is merely to illustrate and explains the present invention, is not intended to limit the present invention.

Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Following retouches Stating when relating to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element. Embodiment described in following exemplary embodiment does not represent all enforcements consistent with the present invention Mode.On the contrary, they only with describe in detail in appended claims, the present invention some in terms of phase The example of consistent apparatus and method.

Based on there is the problem expending more hardware resource in existing Digital Up Convert system, the present invention implements Example provides a kind of Multicenter digital up-conversion system, the Multicenter digital up-conversion system that the present invention provides based on Inverse Fourier transform realizes up-conversion, is used for saving hardware resource.Certainly, in order to improve the efficiency of up-conversion, Inverse Fourier transform can use discrete fast-Fourier inverse transformation.There is provided many to the embodiment of the present invention below The design principle of passage numeral up-converter system is described in detail.

Firstly, it is necessary to again it is clear that treat the target frequency of frequency variation signal, be to treat that frequency variation signal is through Fig. 1 Mid frequency after the first order interpolation filter of shown system and complex modulator；And treat that frequency variation signal is Whole target frequency is until frequency variation signal center frequency after the second level quadrature modulator of system shown in Figure 1 Rate.So, target frequency and final goal frequency are different concepts.Such as signal I, this signal Final goal frequency be f_i, then the target frequency of this signal is (f_i-f₀)。

In the Multicenter digital up-conversion system that the embodiment of the present invention provides, last treats frequency variation signal The module carrying out processing is real modulated signal acquisition module, and the functional equivalent of this module is in system shown in Figure 1 Second level interpolation filter and second level quadrature modulator.So, in embodiments of the present invention, with Fig. 1 Unlike shown system, the embodiment of the present invention is merely able to make to treat in frequency variation signal by inverse Fourier transform Frequency of heart arrives target frequency.

And in actual applications, inverse Fourier transform can not be removed treating frequency variation signal frequently to any frequency, therefore This, to realize using the method for inverse Fourier transform to carry out up-conversion, then firstly the need for the treatment of frequency conversion letter Number mid frequency carry out pretreatment, in order to this until frequency variation signal after inverse discrete Fourier transform, Corresponding target frequency can be reached accurately.

Based on above-mentioned design, schematic diagram such as Fig. 2 institute of the Multicenter digital up-conversion system that the present invention provides Showing, this system includes pretreatment module 201, and Fourier removes frequency module 202, closes road module 203 and real tune Signal acquisition module 204 processed, wherein:

By each road, described pretreatment module 201, for treating that the mid frequency Ban Pinzhigai road of frequency variation signal is treated The default frequency that frequency variation signal is corresponding, and the signal after processing exports and removes frequency module to described Fourier, its In, default frequency meets following condition: mid frequency is in a road signal of default frequency through Fourier's inversion After changing, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding；

Described Fourier removes frequency module 202, for mid frequency being in each road signal of default frequency simultaneously Carry out inverse Fourier transform, remove frequency to corresponding target frequency with the mid frequency by each road signal；And, Process Hou Ge road signal is exported to described conjunction road module；

Described conjunction road module 203, carries out one for described Fourier removes frequency module transmission Lai Ge road signal Carrying out after secondary interpolation filtering closing road, the signal behind Bing Jianghe road exports to described real modulated signal acquisition module；

Described real modulated signal acquisition module 204, for carrying out quadratic interpolation filter to the signal behind described conjunction road After ripple, then carry out orthogonal modulation, and export real modulated signal.

For ease of understanding the Multicenter digital up-conversion system that the embodiment of the present invention provides, say in detail below Bright.

1), for pretreatment module 201:

Wherein, in one embodiment, as it is shown on figure 3, described pretreatment module, specifically include:

Primary complex modulator 205, channel to channel adapter 206 and preprocessor 207, wherein:

Described primary complex modulator 205, for treating frequency variation signal for each road, according to formula (1), This road is treated, and the one-level conversion frequencies that frequency variation signal is corresponding is treated, so in the mid frequency Ban Pinzhigai road of frequency variation signal After result is exported to channel to channel adapter；

f_i'=(f_i-f₀)-l_i·Δf (1)

In formula (1):

l_i=round ((f_i-f₀)/Δf)；

$\mathrm{\Δf}=\underset{i,j}{\min }\left(\right|f_i-f_j\left|\right),i\≠\mathrm{j\; i},j=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_iRepresent this road signal final goal frequency after up-converter system Point；(f_i-f₀) represent target frequency；Round represents floor operation；M represents the total way treating frequency variation signal； Δ f represents the absolute value of the minimum frequency difference between the final goal frequency of needed frequency variation signal；N represents expansion Total way after filling.

Wherein, wherein f₀Value without especially constraint, but for saving resource and reducing the consideration of cost, f₀ Value need to be positioned at f₀' vicinity, wherein f₀' solution formula such as formula (2):

$f_0^{\′}=\underset{i}{\min }\left(f_i\right)+\underset{i,j}{\max }\left(\right|f_i-f_j\left|\right)/2,i\≠\mathrm{j\; i},j=\mathrm{1,2},...,M---\left(2\right)$

In formula (2), i represents the i-th road signal；J represents jth road signal；f_iRepresent the i-th road signal warp Cross the final goal frequency after up-converter system；f_jRepresent final after up-converter system of jth road signal Target frequency；M represents the total way treating frequency variation signal.

It is also preferred that the left multichannel can share a primary complex modulator until frequency variation signal after parallel-serial conversion. By a primary complex modulator, each road is treated that frequency variation signal is treated on the mid frequency Ban Pinzhigai road of frequency variation signal Corresponding one-level conversion frequencies, the so corresponding first order interpolation of each road signal relative in prior art Wave filter and complex modulator, it is possible to realize the multiplexing of primary complex modulator, thus save hardware further Resource.

Certainly, in the embodiment of the present invention, it is also possible to the corresponding primary complex modulator of each road signal, because of For treating that frequency variation signal is one-level conversion frequencies through the mid frequency of primary complex modulator, this frequency is less than being somebody's turn to do The target frequency of frequency variation signal is treated on road, so, primary complex modulator carries out removing frequency institute according to formula (1) The hardware resource consumption needed will be much smaller than first order interpolation filter of the prior art and complex modulator Hardware resource consumption.

Described channel to channel adapter 206, for sending each road signal choosing come for described primary complex modulator Select output channel, and when the power side that described total way until frequency variation signal is not 2, with at least one tunnel 0 The described total way treating frequency variation signal is extended for the power side of 2 by signal, then by the signal after expansion way Export correspondingly to each preprocessor；

Wherein, it is also preferred that the left the way after Kuo Chonging is the way minimum with the difference of the total way treating frequency variation signal. Such as, treat that total way of frequency variation signal is 3, then the total way after expanding is 4；Treat total road of frequency variation signal Number is 5, then the total way after expanding is 8；The total way treating frequency variation signal is 7, then the total way after expanding Also it is 8, by that analogy.

Wherein, if treating that total way of frequency variation signal is M, expanding the total way after way is N, then its Middle M the output signal passed through is identical with the signal of M passage of input, and remaining N-M passage Output signal is then 0.

Wherein, in one embodiment, described channel to channel adapter 206 is at the beginning of being described according to following methods Each road signal behavior output channel that level complex modulator transmission comes:

First ,+1 passage of kth is made to export the i-th road signal according to formula (2):

K=(l_i+N)modN (3)

Wherein, in formula (3):

l_i=round ((f_i-f₀)/Δf)

$B=\max (-2\underset{i}{\min }\left(l_i\right),2\underset{i}{\max }\left(l_i\right)+2),i=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_iRepresent this road signal final goal frequency after up-converter system Point；(f_i-f₀) represent target frequency；Round represents floor operation；M represents the total way treating frequency variation signal； Δ f represents the absolute value of the minimum frequency difference between the final goal frequency of needed frequency variation signal；N represents expansion Total way after filling.

Described preprocessor 207, for the mid frequency Ban Pinzhigai road signal pair by a corresponding road signal The default frequency answered.

Wherein, in one embodiment, the structural representation of preprocessor as shown in Figure 4, described pretreatment Device 207 is used for corresponding for the mid frequency Ban Pinzhigai road signal of a corresponding road signal according to following methods Preset frequency: (k+1) individual preprocessor has been used for being multiplied by input signalCalculating, wherein, θ_k=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 ensure defeated The sample rate entering signal meets nyquist sampling theorem；N represents the total way after expansion.

2), frequency module 202 is removed for Fourier；

This module can carry out removing frequency process with using discrete fast-Fourier Transform algorithm to treat frequency variation signal. It is also preferred that the left remove frequency efficiency for improving further, when using discrete fast-Fourier Transform algorithm, calculate knot Fruit can not be divided by the scale factor in discrete fast-Fourier inverse transformation formula.

3), for closing road module 203:

Signal can produce mirror image composition after carrying out interpolating sampling, for realizing the filtering to this mirror image composition, permissible Use polyphase filter technology, complete the filtering to mirror image composition by least two multiphase filter.So, As in figure 2 it is shown, described conjunction road module 203, specifically comprise the steps that

Multi phase filter bank 208, allotter 209, delay adder 210 and reversing switch 211, wherein:

Described multi phase filter bank 208, including at least one multiphase filter, and each multiphase filter Lai mono-road signal one_to_one corresponding is sent with described Fourier transformation module；Wherein, each multiphase filter A corresponding road signal is filtered, and filtered signal is exported to described allotter；

Described allotter 209, distributes to predetermined number for described multi phase filter bank is sent the signal come Described delay adder；

Described delay adder 210, postpones at least one road signal carrying out the distribution of described allotter Hou Zaihe road, the signal behind Bing Jianghe road exports to described reversing switch；

Described reversing switch 211, defeated for each delay adder is sent after the signal come carries out parallel-serial conversion Go out to described real modulated signal acquisition module 204.

Below reasonable module 203 is described in detail:

A, about multiphase filter 208:

Wherein, the N road signal after expansion, send into and N number of multiphase filter is filtered process, (m+1) Shown in the transmission function such as formula (4) of individual multiphase filter:

$H_m\left(z^D\right)=\underset{r=0}{\overset{\mathrm{\τ}-1}{\mathrm{\Σ}}}h(m+\mathrm{rN})\·z^{-\mathrm{rD}},m=\mathrm{0,1},...,N-1---\left(4\right)$

In formula (4),

Wherein h (m+rN), is designated as the impulse response that h (n) is low pass filter, the transmission of this low pass filter Function is: $H\left(z\right)=\underset{n=0}{\overset{N_{\mathrm{LP}}-1}{\mathrm{\Σ}}}h\left(n\right)\·z^{-n}.$

Wherein, in formula (4), N_LPExponent number for low pass filter；N represents the total way after expansion； D is the positive approximate number of N and the value of D need to ensure that the sample rate of input signal meets nyquist sampling fixed Reason；Z represents transform.

B, about allotter 209:

When the predetermined number postponing adder is L, N number of signal of input is then distributed to L by allotter Individual delay adder.Allocation rule is as follows: assuming that N number of signal of allotter input is a₀,a₁,…,a_N-1, then D the signal being sent to postpone adder 1 is a₀,a_L,…,a_(D-1)L, it is sent to postpone D of adder 2 Signal is a₁,a_L+1,…,a_(D-1)L+1, the rest may be inferred, and D the signal being sent to postpone adder L is a_L-1,a_2L-1,…,a_N-1。

C, about postpone adder 210:

The structural representation of one delay adder is as shown in Figure 5.Each delay adder is individual to the D of input Signal postpones according to Delay Rules, then closes road and is added.Wherein, Delay Rules is: the first via inputs Signal does not postpones,；Second tunnel input signal postpones 1 unit of time；3rd tunnel input signal postpones 2 Unit of time；The like, D road input signal postpones D-1 unit of time.In Figure 5, z^-1 Represent and postpone 1 unit of time, z^-2Represent and postpone 2 unit of time, z^-(D-1)Represent and postpone (D-1) Individual unit of time.

3), real modulated signal acquisition module 204:

As it is shown on figure 3, real modulated signal acquisition module 204 includes third level interpolation filter the 212, the 3rd Level quadrature modulator 213, wherein；

Third level interpolation filter 212, the signal behind involutory road carries out quadratic interpolation filtering；

Third level quadrature modulator 213, the signal after third level interpolation filter 212 is processed Carry out orthogonal modulation, to obtain final real modulated signal.

To sum up, the Multicenter digital up-conversion system that the embodiment of the present invention provides, by using Fourier's inversion Change the frequency spectrum shift realizing treating frequency variation signal, thus hinge structure can save hardware resource.

For ease of being further appreciated by the Multicenter digital up-conversion system that the embodiment of the present invention provides, below to adopt As a example by multiplexing primary complex modulator, the design principle of this system is illustrated:

As shown in Figure 6, the structural representation of Multicenter digital up-conversion system provided for the embodiment of the present invention, According to processing the sequencing treating frequency variation signal, this system includes parallel-to-serial converter 601, primary plural number successively Manipulator 602 (i.e. primary complex modulator in Fig. 3), channel to channel adapter 603 (i.e. passage in Fig. 3 Selector 206), Fourier's passage remove frequency device 604 (between the pretreatment in its integrated Fig. 3 to permutator Each module), third level interpolation filter 605 (i.e. third level interpolation filter 212 in Fig. 3), Three grades of quadrature modulators 606 (i.e. third level quadrature modulator 213 in Fig. 3).Based on set forth above, Fourier's passage is the most only removed frequency device 604 illustrate:

Fourier's passage removes the structural representation of frequency device 604 as shown in Figure 7: after channel to channel adapter, have N Road signal exports removes frequency device to Fourier's passage.So it can be understood as Fourier's passage removes frequency device by N number of Frequency device composition removed by branch road, and superimposed rear signal f (n) that formed of N road signal of frequency device output removed by N number of branch road, defeated Go out to third level interpolation filter 605.

As shown in Figure 8, be a branch road remove frequency device structural representation, in fig. 8, H (Z) represent L times The transmission function of interpolation filtering.

By poly phase, the shown structure in Fig. 8 is equal to the structure shown in Fig. 9.In fig .9, Preprocessor in preprocessor i.e. Fig. 3.

According to the Noble identity (Noble identities) in multi-rate digital signal processing theory, will figure L multiplication sampling module in 9 moves to the right dotted line position (between i.e. filtering and postponing), then can obtain To structured flowchart as shown in Figure 10, complex modulator therein and multiphase filter structural representation such as Shown in Figure 11.Multiphase filter in multiphase filter in Figure 10 i.e. Fig. 3.

N number of branch road in Fig. 7 is removed frequency device be all replaced by the poly phase structure shown in Fig. 9, and Utilize the linear superposition theorem of linear system, Tu7Zhong He road adder is moved to left to poly phase structure Complex modulator and the centre of multiphase filter branch, then can obtain Fourier's passage remove frequency device another Plant structured flowchart, i.e. structural representation shown in Figure 12.In the structure shown in Figure 12, use discrete Fu In leaf inverse transform module instead of calculating process wherein of equal value.For inverse discrete Fourier transform, then can use Known discrete fast-Fourier Transform algorithm quickly calculates, thus reduces amount of calculation, reduces resource Consume and hardware cost.So far, the design principle of the system provided for the embodiment of the present invention has illustrated.

Embodiment two

Based on identical inventive concept, the embodiment of the present invention also provides for a kind of multi-channel digital up-conversion method, As shown in figure 13, the method comprises the following steps:

Step 1301: each road is treated, and the mid frequency Ban Pinzhigai road of frequency variation signal treats that frequency variation signal is corresponding Presetting frequency, wherein, default frequency meets following condition: mid frequency is in a road signal of default frequency After inverse Fourier transform, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding.

Step 1302: each road signal that mid frequency is in default frequency carries out inverse Fourier transform simultaneously, Frequency is removed to corresponding target frequency with the mid frequency by each road signal.

Step 1303: carry out removing after the frequency each road signal to corresponding target frequency carries out an interpolation filtering Close road.

Step 1304: after the signal behind described conjunction road is carried out quadratic interpolation filtering, then carry out orthogonal modulation, And export real modulated signal.

Wherein, in one embodiment, step 1301 specifically includes following steps:

Step A1: treat frequency variation signal for each road, according to below equation, treats frequency variation signal by this road Mid frequency Ban Pinzhigai treats on road the one-level conversion frequencies that frequency variation signal is corresponding；

f_i'=(f_i-f₀)-l_iΔ f,

In above formula:

l_i=round ((f_i-f₀)/Δf)；

$\mathrm{\Δf}=\underset{i,j}{\min }\left(\right|f_i-f_j\left|\right),i\≠\mathrm{j\; i},j=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_i' represent the one-level conversion frequencies of the i-th road signal；f_iRepresent this road Signal final goal frequency after up-conversion method；(f_i-f₀) represent target frequency；Round represents and takes Whole operation；M represents the total way treating frequency variation signal；Δ f represents the final goal frequency of needed frequency variation signal Between minimum frequency difference absolute value；

Step A2: for up-converting to each road signal behavior output channel of the one-level conversion frequencies of correspondence, And when the power side that described total way until frequency variation signal is not 2, treat described with at least one tunnel 0 signal Total way of frequency variation signal is extended for the power side of 2；

Step A3: by corresponding for the mid frequency Ban Pinzhigai road signal of each road signal after the total way of expansion Default frequency.

Wherein, in one embodiment, according to following methods it is the one-level conversion frequencies up-converting to correspondence Each road signal behavior output channel:

First ,+1 passage of kth is made to export the i-th road signal according to below equation:

K=(l_i+ N) modN,

Wherein, in above formula:

l_i=round ((f_i-f₀)/Δf)

$B=\max (-2\underset{i}{\min }\left(l_i\right),2\underset{i}{\max }\left(l_i\right)+2),i=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_iRepresent this road signal final goal frequency after up-conversion method Point；(f_i-f₀) represent target frequency；Round represents floor operation；M represents the total way treating frequency variation signal； Δ f represents the absolute value of the minimum frequency difference between the final goal frequency of needed frequency variation signal；N represents expansion Total way after filling.

Wherein, in one embodiment, according to following methods by each road signal after the total way of expansion The default frequency that frequency of heart Ban Pinzhigai road signal is corresponding:

(k+1) individual preprocessor has been used for being multiplied by input signalCalculating, wherein, θ_k=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 ensure defeated The sample rate entering signal meets nyquist sampling theorem, and N represents the total way after expansion

Wherein, in one embodiment, step 1303 specifically includes following steps:

Step B1: each road signal is filtered；

Step B2: filtered for each road signal is divided into the packet of predetermined number；

Step B3: carry out postponing Hou Zaihe road to the signal of each packet；

Step B4: the signal behind involutory road carries out parallel-serial conversion and exports to extract real modulated signal.

About each method in above-described embodiment, wherein the concrete mode performing operation of various method steps is It is described in detail in about the embodiment of this system, explanation will be not set forth in detail herein.

Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more Computer-usable storage medium containing computer usable program code (include but not limited to disk memory, CD-ROM, optical memory etc.) form of the upper computer program implemented.

The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and / or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/ Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart The function specified in flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, makes Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.

Although preferred embodiments of the present invention have been described, but those skilled in the art once know base This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.

Claims (10)

1. a Multicenter digital up-conversion system, it is characterised in that include pretreatment module, Fourier Remove frequency module, close road module and real modulated signal acquisition module, wherein:

By each road, described pretreatment module, for treating that frequency conversion is treated on the mid frequency Ban Pinzhigai road of frequency variation signal The default frequency that signal is corresponding, and the signal after processing exports and removes frequency module to described Fourier, wherein, Default frequency meets following condition: mid frequency is in a road signal of default frequency through inverse Fourier transform After, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding；

Described Fourier removes frequency module, carries out for mid frequency is in each road signal of default frequency simultaneously Inverse Fourier transform, removes frequency to corresponding target frequency with the mid frequency by each road signal；And, at general Li Houge road signal exports to described conjunction road module；

Described conjunction road module, is carried out in once for described Fourier removes frequency module transmission Lai Ge road signal Carrying out after inserting filtering closing road, the signal behind Bing Jianghe road exports to described real modulated signal acquisition module；

Described real modulated signal acquisition module, for carrying out quadratic interpolation filtering to the signal behind described conjunction road After, then carry out orthogonal modulation, and export real modulated signal.

System the most according to claim 1, it is characterised in that described pretreatment module, specifically wraps Include:

Primary complex modulator, channel to channel adapter and preprocessor group, wherein:

Described primary complex modulator, for treating frequency variation signal for each road, according to below equation, should Road treats that the one-level conversion frequencies that frequency variation signal is corresponding is treated on the mid frequency Ban Pinzhigai road of frequency variation signal, then will Result exports to channel to channel adapter；

f_i'=(f_i-f₀)-l_i·Δf_,

In above formula:

l_i=round ((f_i-f₀)/Δf)；

$\mathrm{\Δf}=\underset{i,j}{\min }\left(\right|f_i-f_j\left|\right),i\≠\mathrm{j\; i},j==\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_i' represent the one-level conversion frequencies of the i-th road signal；f_iRepresent this road Signal final goal frequency after up-converter system；(f_i-f₀) represent target frequency；Round represents and takes Whole operation；M represents the total way treating frequency variation signal；Δ f represents the final goal frequency of needed frequency variation signal Between minimum frequency difference absolute value；

Described channel to channel adapter, defeated for sending, for described primary complex modulator, each road signal behavior come Go out passage, and when the power side that described total way until frequency variation signal is not 2, with at least one tunnel 0 signal The described total way treating frequency variation signal is extended for the power side of 2, then by the signal after expansion way one by one Export accordingly to each preprocessor；

Described preprocessor, for by corresponding for the mid frequency Ban Pinzhigai road signal of a corresponding road signal Preset frequency.

System the most according to claim 2, it is characterised in that described channel to channel adapter is used for basis Following methods is each road signal behavior output channel that described primary complex modulator transmission comes:

First ,+1 passage of kth is made to export the i-th road signal according to below equation:

K=(l_i+N)modN_,

Wherein, in above formula:

l_i=round ((f_i-f₀)/Δf)

$B=\max (-2\underset{i}{\min }\left(l_i\right),2\underset{i}{\max }\left(l_i\right)+2),i=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_iRepresent this road signal final goal frequency after up-converter system Point；(f_i-f₀) represent target frequency；Round represents floor operation；M represents the total way treating frequency variation signal； Δ f represents the absolute value of the minimum frequency difference between the final goal frequency of needed frequency variation signal；N represents expansion Total way after filling.

System the most according to claim 2, it is characterised in that described preprocessor for according to Lower method is by default frequency corresponding for the mid frequency Ban Pinzhigai road signal of a corresponding road signal:

(k+1) individual preprocessor has been used for being multiplied by input signalCalculating, wherein, θ_k=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 ensure defeated The sample rate entering signal meets nyquist sampling theorem；N represents the total way after expansion.

System the most according to claim 1, it is characterised in that described conjunction road module, specifically includes:

Multi phase filter bank, allotter, delay adder and reversing switch, wherein:

Described multi phase filter bank, including at least one multiphase filter, and each multiphase filter and institute State Fourier transformation module and send Lai mono-road signal one_to_one corresponding；Wherein, each multiphase filter is to right Ying mono-road signal is filtered, and exports filtered signal to described allotter；

Described allotter, distributes to the institute of predetermined number for described multi phase filter bank is sent the signal come State delay adder；

Described delay adder, after at least one road signal that the distribution of described allotter is next is postponed again Closing road, the signal behind Bing Jianghe road exports to described reversing switch；

Described reversing switch, for each delay adder send come signal carry out parallel-serial conversion after export to Described real modulated signal acquisition module.

6. a multi-channel digital up-conversion method, it is characterised in that including:

Each road is treated, and the default frequency that frequency variation signal is corresponding is treated on the mid frequency Ban Pinzhigai road of frequency variation signal, Wherein, default frequency meets following condition: the road signal that mid frequency is in default frequency is inverse through Fourier After conversion, the mid frequency of this road signal up-converts to the target frequency that this road signal is corresponding；

Each road signal that mid frequency is in default frequency carries out inverse Fourier transform simultaneously, to be believed on each road Number mid frequency remove frequency to corresponding target frequency；

Carry out closing road by removing after the frequency each road signal to corresponding target frequency carries out an interpolation filtering；

After signal behind described conjunction road is carried out quadratic interpolation filtering, then carry out orthogonal modulation, and export real tune Signal processed.

Method the most according to claim 6, it is characterised in that described frequency variation signal is treated on each road Mid frequency Ban Pinzhigai road treat the default frequency that frequency variation signal is corresponding, specifically include:

Treat frequency variation signal for each road, according to below equation, the mid frequency that frequency variation signal is treated on this road is removed Pin Zhigai treats on road the one-level conversion frequencies that frequency variation signal is corresponding；

f_i'=(f_i-f₀)-l_i·Δf_,

In above formula:

l_i=round ((f_i-f₀)/Δf)；

$\mathrm{\Δf}=\underset{i,j}{\min }\left(\right|f_i-f_j\left|\right),i\≠\mathrm{j\; i},j==\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_i' represent the one-level conversion frequencies of the i-th road signal；f_iRepresent this road Signal final goal frequency after up-converter system；(f_i-f₀) represent target frequency；Round represents and takes Whole operation；M represents the total way treating frequency variation signal；Δ f represents the final goal frequency of needed frequency variation signal Between minimum frequency difference absolute value；

For up-converting to each road signal behavior output channel of one-level conversion frequencies of correspondence, and when described in treat When total way of frequency variation signal is not the power side of 2, with at least one tunnel 0 signal by described frequency variation signal for the treatment of Total way is extended for the power side of 2；

By default frequency corresponding for the mid frequency Ban Pinzhigai road signal of each road signal after the total way of expansion Point.

Method the most according to claim 7, it is characterised in that according to following methods for up-converting to Each road signal behavior output channel of corresponding one-level conversion frequencies:

First ,+1 passage of kth is made to export the i-th road signal according to below equation:

K=(l_i+N)modN_,

Wherein, in above formula:

l_i=round ((f_i-f₀)/Δf)

$B=\max (-2\underset{i}{\min }\left(l_i\right),2\underset{i}{\max }\left(l_i\right)+2),i=\mathrm{1,2},...,M;$

Wherein, i represents the i-th road signal；f_iRepresent this road signal final goal frequency after up-converter system Point；(f_i-f₀) represent target frequency；Round represents floor operation；M represents the total way treating frequency variation signal； Δ f represents the absolute value of the minimum frequency difference between the final goal frequency of needed frequency variation signal；N represents expansion Total way after filling.

Method the most according to claim 7, it is characterised in that total road will be expanded according to following methods The default frequency that the mid frequency Ban Pinzhigai road signal of each road signal after number is corresponding:

(k+1) individual preprocessor has been used for being multiplied by input signalCalculating, wherein, θ_k=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 ensure defeated The sample rate entering signal meets nyquist sampling theorem；N represents the total way after expansion.

Method the most according to claim 6, it is characterised in that the described target that will remove frequency extremely correspondence Each road signal of frequency carries out after carrying out an interpolation filtering closing road, specifically includes:

Each road signal is filtered；

Filtered for each road signal is divided into the packet of predetermined number；

Carry out postponing Hou Zaihe road to the signal of each packet；

Signal behind involutory road carries out parallel-serial conversion and exports to extract real modulated signal.