CN103457888B - Combine communicate signalling method and the device of liter sampling with digital fabrication - Google Patents
Combine communicate signalling method and the device of liter sampling with digital fabrication Download PDFInfo
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Abstract
Combine liter the signal sending spparatus that communicates of sampling and digital fabrication, comprise Coefficient generation module, packet signal generation module, making module of searching table and storage and address mapping module. Coefficient generation module is used for generating the coefficient of a formed filter according to the liter sampling multiple that a group's time delay preset and are preset; Does is packet signal generation module used for generating Individual packet signal, each packet signal hasIndividual element, wherein,Represent described group's time delay;Represent the order of modulation of described base-band input signal; Search table and make module for basisIndividual packet signal and liter sampling multiple makeIndividual searching table, each table of searching comprises element number and is; Storage and address mapping module are used for described in generalIndividual table of searching is stored in a storer, and is mapped mutually the address of a base-band input signal grouping with described storer within hardware. The present invention also provides a kind of and combines the communicate signalling method of liter sampling with digital fabrication.
Description
Technical field
The present invention relates to digital communication and digital signal processing technique field, particularly relate to and a kind of combine liter communicate signalling method and the device of sampling with digital fabrication.
Background technology
The frequency spectrum of communications baseband signal can be processed by digital fabrication wave filter specially, make it at elimination intersymbol interference (InterSymbolInterference, ISI) and under realizing the prerequisite of optimum detection, compression signal frequency band, improve the utilization ratio of frequency spectrum, the solution crowded problem of modern digital communication frequency band is significant.
Digital fabrication filter construction belongs to and has limit for length unit impulse response (FiniteImpulseResponse, FIR) one of wave filter, conventional way is realized by traditional multiply accumulating method, namely by input signal and unit impulse response are carried out linear convolution. But, along with the increase of formed filter coefficient, this kind of convolution algorithm will certainly take a large amount of multiply-accumulator (MultiplierAddCell, MAC) unit and delay unit, cause field-programmable gate array (Field-ProgrammableGateArray, FPGA) hardware resource delay nervous, system increases, and increases the cost of equipment.
Summary of the invention
For the problems referred to above, being necessary that providing a kind of combines liter the communicate signal sending spparatus of sampling with digital fabrication, to solve when input signal is as the low-order-modulated signal of base band, existing FIR formed filter needs a large amount of multiply-accumulator, hardware resource is nervous, increases the cost problem of equipment.
In addition, there is a need to provide a kind of and combine the signalling method that communicates of liter sampling with digital fabrication.
Combining the communicate signal sending spparatus of liter sampling with digital fabrication, for receiving base-band input signal and form shaping signal, this device comprises:
Coefficient generation module, the liter sampling multiple that the group's time delay and for presetting according to is preset generates the coefficient of a formed filter;
Packet signal generation module, for generatingIndividual packet signal, each packet signal hasIndividual element, wherein,Represent described group's time delay;Represent the order of modulation of described base-band input signal;
Search table and make module, for basisIndividual packet signal and liter sampling multiple makeIndividual searching table, each table of searching comprises element number and is, described in search table element for forming described shaping signal, wherein,Represent and rise sampling multiple; And
Store and address mapping module, described in inciting somebody to actionIndividual table of searching is stored in a storer, and is mapped mutually the address of a base-band input signal grouping with described storer within hardware.
Combining the communicate signal sending spparatus of liter sampling with digital fabrication, for receiving base-band input signal and form shaping signal, the method comprises the steps:
The liter sampling multiple default according to a group's time delay preset and one generates the coefficient of a formed filter;
GenerateIndividual packet signal, each packet signal hasIndividual element, wherein,Represent described group's time delay;Represent the order of modulation of described base-band input signal;
According toIndividual packet signal and liter sampling multiple makeIndividual searching table, each table of searching comprises element number and is, described in search table element for forming described shaping signal, wherein,Represent and rise sampling multiple; And
Described in inciting somebody to actionIndividual table of searching is stored in a storer, and is mapped mutually the address of a base-band input signal grouping with described storer within hardware.
Described combine liter sampling and digital fabrication communicate signal sending spparatus and method is searched table by shaping result corresponding for input signal being made and is stored, and the address of the grouping of described input signal with storer is mapped, in time needing to carry out shaping to input signal later, only need to read the content searching table according to corresponding memory address, corresponding shaping result can be obtained. So not only accelerate data processing speed, also can avoid using a large amount of multiply-accumulator and causing taking of hardware resource.
Accompanying drawing explanation
Fig. 1 is the functional block diagram combining liter the communicate signal sending spparatus of sampling with digital fabrication of better embodiment of the present invention.
Fig. 2 is the schema combining liter the communicate signalling method of sampling with digital fabrication of better embodiment of the present invention.
Main element nomenclature
| Combine the communicate signal sending spparatus of liter sampling with digital fabrication | 10 |
| Coefficient generation module | 11 |
| Packet signal generation module | 12 |
| Search table and make module | 13 |
| Store and address mapping module | 14 |
| Postpone grouping module | 15 |
| Counter module | 16 |
| Result output module | 17 |
| Rise sampling unit | 131 |
| Linear convolution unit | 132 |
| Element interception unit | 133 |
| Search table and generate unit | 134 |
| Fixed point cut position unit | 135 |
Following embodiment will illustrate the present invention further in conjunction with above-mentioned accompanying drawing.
Embodiment
In spread spectrum communication, deep space communication, code division multple access (CodeDivisionMultipleAccess, CDMA) cellular communication and military private network communication system, in order to ensure the reliability of signal, often adopt the modulation system of low order. When the low-order-modulated signal that base band output signal is, the level value of the input of formed filter be very finite value, such as two-phase phase-shift keying (PSK) (BinaryPhaseShiftKeying, BPSK) modulation only+1 with-1 two kind of level.In addition, for the formed filter that group's time delay is relatively little, it is resolved that the parameter that wave filter exports only comprises some, therefore can search, by the limited degree of depth, the result that table obtains formed filter. based on this, please refer to the drawing 1, the present invention provides a kind of and combines the communicate signal sending spparatus 10 of liter sampling with digital fabrication, combining a liter sampling runs in field-programmable gate array (Field-ProgrammableGateArray with the signal sending spparatus 10 that communicates of digital fabrication, or digital signal processor (DigitalSignalProcessor FPGA), etc. DSP) on programming device, the signal sending spparatus 10 that communicates combining liter sampling and digital fabrication is for making searching table and storing of corresponding shaping result, also for receiving a digital baseband signal, and directly read the element searching in table according to the digital baseband signal received and export as shaping result.
Described base-band input signal is digital baseband signal, it comprises mutually orthogonal homophase (In-phase, the I) component of phase place and orthogonal (Quadrate, Q) component, the order of modulation of input signal, namely the order of modulation of in-phase component and quadrature component is, then the level number of base-band input signal is, namely input signal can havePlant different level number values.
Combine a liter sampling to comprise Coefficient generation module 11, packet signal generation module 12 with the signal sending spparatus 10 that communicates of digital fabrication, search table and make module 13, store and address mapping module 14, postpone grouping module 15, counter module 16 and result output module 17.
The group time delay of Coefficient generation module 11 for presetting according to oneAnd the liter sampling multiple that presetsGenerate the coefficient of a formed filter. Wherein, described group's time delayAnd rise sampling multipleValue determine according to the demand of system. In the present embodiment, the structure of formed filter is raised cosine FIR filter or square root raised cosine filter. In group's time delay of known formed filterAnd rise sampling multipleUnder prerequisite, described Coefficient generation module 11 utilizes Matlab or other digital filter design instrument, directly generates the coefficient of formed filter��
Packet signal generation module 12 is for generatingIndividual packet signal, each packet signal hasIndividual element. Therefore,Individual packet signal can be collectively expressed as. Due to packet signalEach interior element hasPlant different level number values, therefore packet signalOne hasPlant different value.
Search table and make module 13, for basisIndividual packet signal and liter sampling multipleMakeIndividual search table. Specifically, search table to make module 13 and comprise and rise sampling unit 131, linear convolution unit 132, element interception unit 133, search table and generate unit 134 and fixed point cut position unit 135.
First the degree of depth and the number of table is determined to search. Owing to the liter sampling multiple of formed filter is, forDoubly rising sampling, each input clock correspond toIndividual different sampling clock exports. Therefore, the number searching table isIndividual. Due to input signalOrder of modulation be, group's time delay of formed filter is, then each address wire number searching table is, each degree of depth searching table should be. The depth representing searching table searches the number of element contained by table.
Rise sampling unit 131 for rightIndividual element number isPacket signal carry outDoubly rise sampling, namely carry out N times of interpolation zero, formThe input vector of individual formed filter:
Wherein, functionIt is a matrix function, represents and generate oneThe full null matrix on rank.Described input vectorElement number beIndividual, compriseIndividual 0 HeIndividual non-zero input signal, i.e. input signal��
In upper formula, due to packet signalEach element hasPlant different level number values, byIndividual element inserts the input vector of zero formationDifferent always may having counted, that is, rising sampling unit 131 willIndividual element number isPacket signal interpolation zero after, totalThe individual input vector with different value��
Linear convolution unit 132 is for inciting somebody to actionIndividual input vectorRespectively with the formed filter coefficient generatedDo linear convolution, obtainIndividual convolution vector. Wherein, each convolution vectorElement number beIndividual.
Element interception unit 133 is for from each convolution vector generatedMiddle interceptingIndividual element, forms one and searches table vector. In the present embodiment, from each convolution vectorIn elementIt is truncated to element, thus form and search table vector:
,
Search table and generate unit 134 for will be fromIndividual convolution vectorInterceptIndividual search table vectorFormThe individual degree of depth isSearch table. It is specially,Individual search table vectorFormRank matrix:
MatrixInterior element corresponds toThe individual degree of depth isThe element searching table; MatrixThe element of interior each row forms one and searches table. N number of search table respectively corresponding N doubly rise sampling, i.e. the result of N times of interpolation.
Fixed point cut position unit 135 is for matrixInterior each element carries out fixed point and quantizes and cut position, meets system accuracy requirement to control to search the bit wide of each element of table.
Storage and address mapping module 14 are for by matrix, namely N number of degree of depth isTable of searching be stored in a storer (not shown), such as block random access memory (BlockRandomAccessMemory, or Double Data Rate synchronous dynamic random storer (DoubleDataRateSynchronousDynamicRandomAccessMemory BRAM), etc., DDRSDAM) and within hardware the address of a base-band input signal grouping with described storer is mapped mutually.
Described base-band input signal, for receiving described base-band input signal within hardware, is carried out postponing grouping by delay grouping module 15, forms base-band input signal grouping and divides into groups base-band input signal as the address of described storer. Being specially, postpone grouping module 15 and described base-band input signal is carried out buffer memory, obtain the grouping of described base-band input signal, the grouping of described base-band input signal comprisesThe input signal of the individual unit time of time delay successively.
Counter module 16 is for receiving described input signal in delay grouping module 15Time, obtained by cycle countIndividual numerical value, namely numerical value 0 arrives��
Result output module 17 is for the counting according to counter module 16, rightThe individual degree of depth isTable of searching carry out sequential control, and sequential control will be completedIndividual table of searching exports as the shaping result of formed filter. ForDoubly rising sampling, each input clock correspond toIndividual different sampling clock exports. Therefore, when the count value of counter module 16 is 0, then corresponding first exports sampling instant, and the memory address that result output module 17 bases and the grouping of described input signal map mutually reads first in described storer and searches table and export; When the count value of counter module 16 is 2, then corresponding 2nd exports sampling instant, and result output module 17 reads the 2nd in described storer and searches table and export; Analogize with this, until exporting theIndividual search table, so namely realize the control searching table output timing.
Referring to Fig. 2, a liter sampling of combining for better embodiment of the present invention comprises the steps: with the signalling method that communicates of digital fabrication
Step S1: according to default group's time delayAnd the liter sampling multiple presetGenerate the coefficient of a formed filter,��
Step S2: generateIndividual packet signal, each packet signal comprisesIndividual element.
Step S3: rightIndividual input signal grouping interpolation zero, is formedIndividual input vector:
Step S4: willIndividual input vectorRespectively with the coefficient of the formed filter generatedDo linear convolution, obtainIndividual convolution vector,��
Step S5: from each convolution vector generatedMiddle interceptingIndividual element, forms one and searches table vector,��
Step S6: will be fromIndividual convolution vectorInterceptIndividual search table vectorForm oneMatrix, thus obtainThe individual degree of depth isSearch table.
Step S7: to matrixInterior each element carries out fixed point and quantizes and cut position, meets system accuracy requirement to control to search the bit wide of each element of table.
Step S8: by matrix, namelyThe individual degree of depth isTable of searching be stored in a storer, and within hardware a base-band input signal grouping is mapped mutually with the address of described storer.
Step S9: receive a base-band input signal, and by hardware, described base-band input signal is carried out time delay and grouping, form base-band input signal grouping
Step S10: start cycle count.
Step S11: when often completing once to count, corresponding search table according to reading one in described storer with the memory address that maps mutually of base-band input signal grouping and exports, thus export successivelyThe individual degree of depth isSearch table, with rightThe individual output searching table carries out sequential control, and will complete sequential controlIndividual table of searching exports as the shaping result of formed filter.
Described combine liter sampling and digital fabrication communicate signal sending spparatus and method is searched table by shaping result corresponding for input signal being made and is stored, and the address of the grouping of described input signal with storer is mapped, in time needing to carry out shaping to input signal later, only need to read the content searching table according to corresponding memory address, corresponding shaping result can be obtained. So not only accelerate data processing speed, also can avoid using a large amount of multiply-accumulator and causing taking of hardware resource.
Concrete numerical value is adopted liter sampling of combining of the present invention to be described with the signal sending spparatus 10 that communicates of digital fabrication below.
If base-band input signal is the digital baseband signal adopting 16 quadrature amplitude modulation (QuadrateAmplitudeModulation, QAM), group's time delay, rise sampling multiple, then Coefficient generation module 11 is according to group's time delayAnd rise sampling multipleThe formed filter coefficient generated can be:
h=[00.00480.01710.02270-0.0576-0.1200-0.1225
00.26250.60020.88721.00.88720.60020.2625
0-0.1225-0.1200-0.057600.02270.01710.0048]
Due to group's time delay, therefore packet signal generation module 12 generates the input signal of 6 time delay unit time successively��
Owing to the in-phase component of 16QAM signal and the order of modulation of quadrature component are 2, each table degree of depth of searching that therefore depth determining unit 131 is determined is��
Due to a liter sampling multiple, in-phase component and quadrature component for input signal all need 4 to search table, then need 8 altogether and search table. But owing to in-phase component and quadrature component have identical look-up table configuration, therefore, in fact only need to generate 4 and search table.
Rise sampling unit 131 and construct input vector:
Owing to input signal adopts 16QAM modulation,Value be 2,1 ,-1 ,-2 four kinds of values, each value can the scale-of-two of 2 represent.Therefore vector is inputtedOne has 4096 kinds of different values.
Linear convolution unit 132 is by each input vectorWith formed filter coefficientDo convolution algorithm, obtain 4096 convolution vectors; Element interception unit 133 is from each convolution vectorIn pick out 4 elements, obtain searching table vector, the matrix finally obtaining 4096*4 rank is as follows:
Fixed point cut position unit 135 is for matrixInterior each element carries out fixed point and quantizes and cut position, and the bit wide making each element is 16. So, consumes resources is that table is searched in 4 4096*16 positions altogether. If realizing this look-up table configuration on FPGA, it is only necessary to utilize minority built-in storage resource.
Table 1
Referring to table 1, table 1 illustrates the utilization of resources contrast situation combining the communication signal sending spparatus of liter sampling with digital fabrication and method and conventional FIR molding mode of the present invention. As can be seen from Table 1, if by conventional FIR filter implementation method, it is contemplated that after the symmetry of FIR filter coefficient, in addition it is also necessary to expend multiplier 12, totalizer 23, and bigger output can be produced and postpone; Use parallel distributed arithmetic, it is necessary to expend 2* 16 search the table RAM of 512Mb (altogether), 1 totalizer, and bigger output can be produced and postpone; But use the communication signal sending spparatus 10 combining liter sampling and digital fabrication of the present invention, when then wave filter coefficient is identical, only need that 4 4096*16's search table (altogether the RAM of 256Kb) and 6 delay units, cost savings hardware multiply accumulating resource, and have and export the little feature of delay.
Claims (10)
1. combine the communicate signal sending spparatus of liter sampling with digital fabrication, for receiving base-band input signal and form shaping signal, it is characterised in that, this device comprises:
Coefficient generation module, the liter sampling multiple that the group's time delay and for presetting according to is preset generates the coefficient of a formed filter, and described formed filter is raised cosine FIR filter or square root raised cosine filter;
Packet signal generation module, for generating 22��MIndividual packet signal, each packet signal has 2 �� elements, and wherein, �� represents described group's time delay; M represents the order of modulation of described base-band input signal;
Search table and make module, for according to 22��MIndividual packet signal and liter sampling multiple make N number of searches table, each search table to comprise element number be 22��M, described in search table element for forming described shaping signal, wherein, N represents a liter sampling multiple; And
Store and address mapping module, for described N number of table of searching is stored in a storer, and within hardware the address of a base-band input signal grouping with described storer is mapped mutually.
2. combine liter the signal sending spparatus that communicates of sampling and digital fabrication as claimed in claim 1, it is characterised in that, described in search table making module and comprise:
Rise sampling unit, for 22��MIndividual packet signal carries out N and doubly rises sampling, forms 22��MThe individual input vector with different value;
Linear convolution unit, for by 22��MIndividual input vector respectively coefficient with the formed filter generated do linear convolution, obtain 22��MIndividual convolution vector;
Element interception unit, for intercepting N number of element from each convolution vector generated, forms one and searches table vector; And
Search table and generate unit, for will from 22��MThe 2 of individual convolution vector intercepting2��MIndividual table vector of searching forms one 22��M�� N rank matrix, thus form and N number of comprise 22��MIndividual element search table.
3. combine liter the signal sending spparatus that communicates of sampling and digital fabrication as claimed in claim 2, it is characterised in that, described in search table making module and also comprise:
Fixed point cut position unit, for described 22��MEach element in the matrix of �� N rank carries out fixed point and quantizes and cut position.
4. combine liter the communicate signal sending spparatus of sampling with digital fabrication as claimed in claim 2, it is characterised in that, described combine a liter sampling and also comprise with the signal sending spparatus that communicates of digital fabrication:
Postpone grouping module, for receiving base-band input signal from hardware, and after it is carried out postpones grouping, form the grouping of described base-band input signal, and described base-band input signal is divided into groups as the address of described storer;
Counter module, for when described delay grouping module receives described input signal, carrying out cycle count; And
Result output module, for often completing once to count at counter module, corresponding search table according to reading one in described storer with the memory address that maps mutually of described input signal grouping and exports.
5. combine the communicate signal sending spparatus of liter sampling with digital fabrication as claimed in claim 2, it is characterised in that: the described sampling unit that rises is by 22��MIndividual packet signal carries out N times of interpolation zero, doubly rises sampling to realize N.
6. combining the communicate signalling method of liter sampling with digital fabrication, for receiving base-band input signal and form shaping signal, the method comprises the steps:
A () generates the coefficient of a formed filter according to the liter sampling multiple that a group's time delay preset and are preset, described formed filter is raised cosine FIR filter or square root raised cosine filter;
B () generates 22��MIndividual packet signal, each packet signal has 2 �� elements, and wherein, �� represents described group's time delay; M represents the order of modulation of described base-band input signal;
C () is according to 22��MIndividual packet signal and liter sampling multiple make N number of searches table, each search table to comprise element number be 22 ��M, described in search table element for forming described shaping signal, wherein, N represents a liter sampling multiple; And
D described N number of table of searching is stored in a storer by (), and mapped mutually the address of a base-band input signal grouping with described storer within hardware.
7. combine the communicate signalling method of liter sampling with digital fabrication as claimed in claim 6, it is characterised in that, step (c) specifically comprises:
To 22��MIndividual packet signal carries out N and doubly rises sampling, forms 22��MThe individual input vector with different value;
By 22��MIndividual input vector respectively coefficient with the formed filter generated do linear convolution, obtain 22��MIndividual convolution vector;
From each convolution vector generated, intercept N number of element, form one and search table vector; And
Will from 22��MThe 2 of individual convolution vector intercepting2��MIndividual table vector of searching forms one 22��M�� N rank matrix, thus form and N number of comprise 22��MIndividual element search table.
8. combine the communicate signalling method of liter sampling with digital fabrication as claimed in claim 7, it is characterised in that, step (c) comprises further:
To described 22��MEach element in the matrix of �� N rank carries out fixed point and quantizes and cut position.
9. combine the communicate signalling method of liter sampling with digital fabrication as claimed in claim 7, it is characterised in that, the method comprises further:
Receive a base-band input signal, and after it is carried out postpones grouping, form the grouping of described base-band input signal, and described base-band input signal is divided into groups as the address of described storer;
When receiving described base-band input signal, carry out cycle count;And
When often completing once to count, corresponding search table according to reading one in described storer with the memory address that maps mutually of described base-band input signal grouping and export.
10. combine the communicate signalling method of liter sampling with digital fabrication as claimed in claim 7, it is characterised in that: to 22 ��MIndividual packet signal carries out N and doubly rises sampling, forms 22��MIn the step of individual input vector, by 22��MIndividual packet signal carries out N times of interpolation zero, doubly rises sampling to realize N.
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