CN101409698B - Data memory of OFDM access system and method for processing baseband signal - Google Patents
Data memory of OFDM access system and method for processing baseband signal Download PDFInfo
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Abstract
The invention discloses a data memory and a baseband signal treating method of an orthogonal frequency division multiplex access system. The memory comprises a modulated complex value database for recording modulated complex values. The method comprises: A. the modulated complex value database is established in the data memory in advance for recording the modulated complex values which are obtained during a bit data flow treatment process; B. a central processing unit modulates an initial bit data flow into a corresponding index value in the database, and a prestored modulated complex result value is obtained from the database according to the index value; C. the modulated complex result value is input into a Fourier converter or a Fourier inverse converter for the carrier modulation treatment. With a relation table unit established in the memory, the bit modulation and the subsequent middle treatment are all replaced by corresponding treatment on low order digit index values. Therefore, the storing space of the memory is reduced.
Description
Technical field
The present invention relates to a kind of WiMAX communication OFDMA (Orthogonal frequency divisionmultiple access, the OFDM access) DSP (the Digitalsignal processor of baseband signal modulation in the system, digital signal processor) optimal design field relates in particular to a kind of data storage method when dsp chip is realized Base-Band Processing in the OFDMA system.
Background technology
For a large amount of DSP that process unit take 32bit as data, the mode of real part and imaginary part complex signal can design like this in the storage modulating data, and namely high 16bit deposits imaginary part road signal numerical value, and low 16bit deposits real part road signal numerical value.Symbol is transferred to FFT/IFFT (the Fast Fourier Transform/Inverse Fast Fourier Transform of OFDMA in the OFDMA system with so plural form, fast Fourier transform or fast Fourier transform inverse transformation) converter, thus realize carrier transmission.But usually also to process through some intermediate links after the modulation; just send to the FFT/IFFT converter of OFDMA; if we modulation and afterwards all intermediate treatment link all adopt such storage mode, can bring so undoubtedly the anxiety of storage resources.If reduce the bit position, the numerical accuracy of signal will be affected so, is the problem that we face at present so how to reduce modulating data in the situation that does not reduce precision to the requirement of storage resources.
As shown in Figure 1, can see that bit data flow is after ovennodulation, the complex data that generates 32bit length leaves in the DSP memory, carry out successively intermediate treatment 1, intermediate treatment 2 ... in the time of .., intermediate treatment n, because these plural numbers are needed to process in real time and need to be when these processing are carried out, also to open up the plural number that the DSP memory is deposited 32bit length, at last these plural numbers are passed to the FFT/IFFT converter of OFDMA, such processing procedure has proposed very large demand to the DSP memory space.
Summary of the invention
In order to solve in the existing OFDMA system the excessive problem of DSP memory space requirements in the baseband signal bit data flow processing procedure, the invention provides a kind of data storage and method for processing baseband signal of OFDM access system.
The data storage of OFDM access system of the present invention, described memory contains: a modulated complex Value Data storehouse, be used for record modulated complex value, the position that this modulated complex value leaves in the database is its corresponding index value.
Wherein, described database contains: described database contains: first kind modulated complex value, and it comprises modulates the rear modulated complex value that obtains to the bits of original data flow; And N Equations of The Second Kind modulated complex value, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1.
Adopt the method for processing baseband signal of above-mentioned data storage, it is used for OFDM access system, and described method is carried out according to following steps:
A, in data storage, set up a modulated complex Value Data storehouse in advance, the modulated complex value that obtains in the record baseband signal bit data flow processing procedure;
B, central processing unit are index value corresponding in the described database with the bits of original data stream modulates, obtain the modulated complex end value that prestores from described database according to index value;
C, described modulated complex end value is input in Fourier transformer or the inverse Fourier transform device, carries out carrier modulation treatment.
Wherein, described step B carries out according to following steps:
B1, central processing unit determine the storage subscript of modulated complex value in described database after modulation according to the binary data of bits of original data flow input and default modulating rule, and with this subscript as its index value;
B2, described index value pass through the computing of N intermediate link successively according to default operation rule, and acquisition final result value, and wherein, N is natural number and more than or equal to 1;
B3, described central processing unit with described final result value as storage subscript, corresponding modulated complex value in the described database of direct index.
Among the described step B1, default modulating rule comprises one or more the compound mode in the modulation of quaternary phase shift keying, 16 modulus quadrature amplitude modulation, the 64 modulus quadrature amplitude modulation.
Wherein, in the described steps A, described database contains: first kind modulated complex value, and it comprises modulates the rear modulated complex value that obtains to the bits of original data flow; And N Equations of The Second Kind modulated complex value, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1.
Wherein, described default operation rule comprise to the modulation complex values get the negative value computing, ask the conjugate complex number computing, the computing of negate conjugate complex number.
Wherein, in the described steps A, described database is deposited the modulated complex value that is obtained in the baseband signal bit data flow processing procedure with the form of array or data file.Wherein, N Equations of The Second Kind modulated complex value obtaining after N baseband signal intermediate treatment process of described first kind modulated complex value and this complex values is positioned in described array or the data file by preset order.
Adopt the array mode to store data instance with database, said method specifically can adopt following process implementation: in the described steps A, in described database, N the Equations of The Second Kind modulated complex value that first kind modulated complex value and this complex values obtain after N baseband signal intermediate treatment process is positioned in the continuation address of an array successively; Among the described step B, central processing unit is determined the storage subscript of first kind modulated complex value in described array according to the binary data of bits of original data flow input and required modulation system; Then, the storage subscript of first kind modulated complex value obtains the storage subscript of the 1st Equations of The Second Kind modulated complex value behind the plus and minus calculation of the 1st intermediate link; The storage subscript of the 1st Equations of The Second Kind modulated complex value obtains the storage subscript of the 2nd Equations of The Second Kind modulated complex value behind the plus and minus calculation of the 2nd intermediate link; The like, the final storage subscript that obtains N Equations of The Second Kind modulated complex value after the computing of N intermediate link, finally with this as final result value index data base, how it specifically realizes can be referring to embodiment related example partly.
Invention effect: with respect to traditional processing procedure for the 32bit modulated complex, the present invention is by opening relationships table unit in memory, so that in the modulation of OFDMA system and in follow-up intermediate treatment, all replace with the respective handling to the lower-order digit index value, thereby reduced the memory space of memory, but also increase correspondingly computational speed.
Description of drawings
Fig. 1 is the processing procedure schematic diagram of baseband signal bit data flow in the traditional OFDMA system;
Fig. 2 is the processing procedure schematic diagram of baseband signal bit data flow in the OFDMA of the present invention system.
Embodiment
Referring to Fig. 2, describe technical scheme of the present invention in detail.
In the OFDMA system, data storage of the present invention, it contains a modulated complex Value Data storehouse, is used for the modulated complex value that record baseband signal bit data flow processing procedure obtains, and the position that this modulated complex value leaves in the database is its corresponding index value.(such as, each modulated complex leaves in the one-dimension array according to 32bit, so second second element that modulated complex is exactly array naturally, array index is exactly index value, so index value is the storage element subscript namely, being designated as 0, the second under first storage element is 1 etc.)
In the OFDMA system, the bits of original data flow need to be through ovennodulation, then pass through successively N intermediate treatment link after, just be admitted in the FFT/IFFT converter of OFDMA.When above-mentioned modulation, usually adopt following three kinds of modes to carry out: the modulation of quaternary phase shift keying (QPSK), 16 modulus quadrature amplitude modulation (16QAM), 64 modulus quadrature amplitude modulation (64QAM).After the QPSK modulation, only produce 4 different modulated complex values, modulation produces 16 different modulated complex values through 16QAM, and modulation produces 64 different modulated complex values through 64QAM.No matter how many data volumes these source bit data flows have, through QPSK, 16QAM quadrature amplitude modulation, 64QAM modulation, also can only be in (4+16+64) individual modulated complex value, and can not get other numerical value.In view of these characteristics, just can be with all modulated complex possible value combine and set up a database, use the index value of these modulated complex in database to replace these modulated complex.The present invention just is being based on this thought, is provided with a data library unit in memory, and it uses the result data of the mode stored record modulated process of tabulation.Such data storage method, can reduce the data space of system storage, illustrate, for 100 bit data flows, after the QPSK modulation, generate 100 modulated complex, the value of these 100 modulated complex is because through the QPSK modulation, their value can only be selected in four modulated complex values of QPSK, if with 0,1,2,3 index replaces respectively the value of these four modulated complex, 100 data are through after modulating so, each data can replace their real complex values after modulated with 0 or 1 or 2 or 3 these index values, and in the process before modulating data is sent to the FFT/IFFT converter of OFDMA, modulated process and intermediate link processing procedure can be stored with the modulation index value like this; From the angle of memory space, originally deposited 100 modulated complex, need 100 * 32bit memory space, and if replace the modulated complex value with index value of the present invention, just only needs 100 * 2bit memory space gets final product.
As can be seen from above, above-mentioned database need to contain: first kind modulated complex value, and it comprises modulates the rear modulated complex value that obtains to the bits of original data flow; And N Equations of The Second Kind modulated complex value, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1.When the OFDMA system carried out than modulation, the central processing units such as DSP just can be incorporated into index value in the signal processing of baseband signal bit data flow by the database in the memory.But, when there is calculation procedure in follow-up baseband signal bit data flow intermediate treatment process, namely need to corresponding modulated complex value get negative value, ask conjugation, the computing such as negate conjugation, this time, the content that just needs the expanding data storehouse, so in above-mentioned database, introduce this concept of Equations of The Second Kind modulated complex value, the end value of expression baseband signal intermediate treatment process.Concrete how in the signal of the baseband signal bit data flow of OFDMA system is processed, use above-mentioned database, can see following explanation about correlation technique for details.
As shown in Figure 2, adopt the OFDMA system method for processing baseband signal of above-mentioned data storage, carry out according to following steps:
One, in data storage, sets up in advance a modulated complex Value Data storehouse, the modulated complex value that obtains in the record baseband signal bit data flow processing procedure, this database contains: first kind modulated complex value, and it comprises modulates the rear modulated complex value that obtains to the bits of original data flow; And N Equations of The Second Kind modulated complex value, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1;
Two, central processing unit is index value corresponding in the described database with the bits of original data stream modulates, and this index value carried out subsequent treatment, obtain the modulated complex end value that prestores according to the final result index value from described database, this step can specific as followsly operate:
100, central processing unit (can comprise that DSP or FPGA etc. are used for the controller of Digital Signal Processing) is according to binary data and the default modulating rule of the input of bits of original data flow, determine the storage subscript of modulated complex value in described database after modulation, and with this subscript as its index value; Wherein, this default modulating rule comprises one or more the compound mode in the modulation of quaternary phase shift keying, 16 modulus quadrature amplitude modulation, the 64 modulus quadrature amplitude modulation, which kind of modulation system binary data is carried out just set in advance according to demand;
110, above-mentioned index value is according to default operation rule (this default operation rule can arrange according to get the negative value computing, ask the conjugate complex number computing, negate conjugate complex number computing etc.), pass through successively the computing of N intermediate link, wherein, N is natural number and more than or equal to 1;
120, central processing unit with described final result value as the storage subscript, corresponding modulated complex value in the described database of direct index.
Three, described modulated complex end value is input in Fourier transformer or the inverse Fourier transform device, carries out carrier modulation treatment.
In the said method, for different OFDMA systems, its modulation system for baseband signal sets in advance definite, and can determine to modulate rear complex values for the type of bit data flow (i.e. relevant binary data) and modulation system, that is to say just can determine in QPSK, 16QAM, 64QAM (4+16+64) individual modulated complex, to get which value according to binary data and the default modulation system of the input of bits of original data flow.In view of these characteristics, can in memory, set up in advance a database.So, the as a result complex values after the modulation all leaves in the database corresponding position in, then when carrying out modulation operation, just can know modulation complex values afterwards according to binary data and the default modulation system of the input of bits of original data flow.And just can recognize the storage subscript that this complex values is corresponding according to pre-set position, the index value shown in Fig. 2 namely, so the present invention directly obtains this index value afterwards in modulation, and carries out follow-up intermediate treatment link to it, rather than obtain real modulated complex value.
Below illustrate the go forward side by side base band signal process process of line correlation of building database how referring to table 1.
Table 1
| First value of QPSK |
| The negative value of first value of QPSK |
| Second value of QPSK |
| The negative value of second value of QPSK |
| The 3rd value of QPSK |
| The negative value of the 3rd value of QPSK |
| The 4th value of QPSK |
| The negative value of the 4th value of QPSK |
As shown in Figure 1, if in the OFDMA system, adopt the modulation system of QPSK and intermediate treatment 1 employing to get negative value calculating, then the present invention can set up relevant database referring to table 1 in memory.
At first, described database with the form of array or with the form of data file by default order, deposit the modulated complex value that obtains in the baseband signal bit data flow processing procedure, below take the array Storage Format as the example explanation.N the Equations of The Second Kind modulated complex value that described first kind modulated complex value and this complex values obtain after N baseband signal intermediate treatment process is positioned over by preset order in the described array, namely is positioned over successively in the continuation address of an array; And the default computation rule that has N intermediate link in the described step 3 between the storage subscript of described first kind modulated complex value and N Equations of The Second Kind modulated complex value.As shown in table 1, the complex values that obtains after the QPSK modulation is in the form storage of above-mentioned database with one-dimension array, and the 1st array element placement " first value of QPSK " (its index value can be defined as " 1 "), the 3rd array element placement " second value of QPSK " (its index value can be defined as " 3 "), the 5th array element placement " the 3rd value of QPSK " (its index value can be defined as " 5 "), the 7th array element are placed " the 4th value of QPSK " (its index value can be defined as " 7 ").If first intermediate link 1 is to get the negative value computing, the position of so " negative value of first value of QPSK " being placed the 2nd array element of above-mentioned array, its index value can be defined as " 2 "; With the position that " negative value of second value of QPSK " places the 4th array element of above-mentioned array, its index value can be defined as " 4 "; With the position that " negative value of the 3rd value of QPSK " places the 6th array element of above-mentioned array, its index value can be defined as " 6 "; With the position that " negative value of the 4th value of QPSK " places the 8th array element of above-mentioned array, its index value can be defined as " 8 ".Like this, above-mentioned index value " 1 ", " 3 ", " 5 ", " 7 " are added respectively one computing, then can be converted into index value " 2 ", " 4 ", " 6 ", " 8 ".
In the above-mentioned steps three, for the index value that front continuous step is introduced can be applied to follow-up intermediate treatment process, thereby reach the purpose that reduces the central processing unit stores spaces such as DSP, just need the intermediate treatment process with baseband signal bit data flow shown in Figure 1, be converted among Fig. 2 the intermediate treatment link with respect to associated index values.If the present invention adopts the database shown in the table 1, then in the step 3, if first intermediate link 1 is to get the negative value computing, can adopt to add one additional calculation and process as 1 pair of index value of intermediate link.For example, as shown in Figure 1, bit data flow A obtains " second value of QPSK " after modulating through QPSK, get the negative value computing to what this end value was carried out follow-up intermediate treatment 1 process again, acquisition " negative value of second value of QPSK " also stores, and this process all is that the data of 32bit are processed.Correspondingly, the present invention adopts the mode of Fig. 2, use index value and database that baseband signal is processed, but then its process concrete operations is as follows:
According to obtaining " second value of QPSK " after the bit data flow A process QPSK modulation, can know that then its index value in above-mentioned database is " 3 ", then to the add one operation of index value through intermediate link 1, then obtain index value " 4 ", according to above-mentioned database, can learn, the real 32bit complex values that index value " 4 " is corresponding is " negative value of second value of QPSK ", and intermediate treatment 1 link among visible Fig. 2 also just is equivalent to real 32bit complex values is got the negative value computing.The computational short cut of doing so not only 32bit is the computing to the 2bit data, and has reduced memory space, improved arithmetic speed.
Certainly, the intermediate treatment process of just having enumerated a Fig. 1 in the above-mentioned example is the computing of getting negative value, but the intermediate treatment process of baseband signal bit data flow may comprise: the modulation complex values is asked the calculation procedures such as conjugate complex number computing or the computing of negate conjugate complex number; So, the same database that in a like fashion above-mentioned table 1 is characterized of can adopting expands, ask conjugation, the as a result complex values of the intermediate treatment processes such as negative conjugation is as the element of database, preferably be placed on the back that it processes front complex values element, in of the present invention relevant intermediate treatment link shown in Figure 2, just can directly transform needed index value by simple signed magnitude arithmetic(al) like this, and obtain needed authentic and valid 32bit modulated complex value according to the index value that obtains after the final processing according to database, and send into the FFT/IFFT converter of OFDMA, realize carrier transmission.
From the above, when having the correlation computations step in traditional baseband signal bit data flow intermediate treatment process shown in Figure 1, according to the method described above database is expanded with regard to needs, and associated index values is carried out intermediate link the processing of Fig. 2, introduce certain calculation procedure and match with it.Below only provided a kind of about Database and the method for setting the transformational relation of index value in the intermediate treatment link, can change as required the file layout (such as the array form of multiple lines and multiple rows) of database, corresponding intermediate treatment link also has correspondingly and changes, this change can be with reference to content indicated in the present invention, obtains in conjunction with the correlation process method of mathematics.
With respect to traditional processing procedure for the 32bit modulated complex, the present invention is by building database in memory, be used for recording authentic and valid ground modulated complex value, with represent its position relationship ground index value be incorporated into the modulation and in follow-up intermediate treatment, so that traditionally the processing procedure of 32bit data is all replaced with respective handling to the lower-order digit index value, thereby reduced the memory space of memory, but also increase correspondingly computational speed.
Illustrating of above-mentioned each concrete steps is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.
Claims (8)
1. method for processing baseband signal, it is used for OFDM access system, it is characterized in that described method is carried out according to the following steps:
A, in data storage, set up a modulated complex Value Data storehouse in advance, the modulated complex value that obtains in the record baseband signal bit data flow processing procedure, the position that this modulated complex value leaves in the database is its corresponding index value;
B, central processing unit are index value corresponding in the described database with the bits of original data stream modulates, obtain the modulated complex end value that prestores from described database according to index value;
C, described modulated complex end value is input in Fourier transformer or the inverse Fourier transform device, carries out carrier modulation treatment,
Wherein, described step B carries out according to following steps:
B1, central processing unit determine the storage subscript of modulated complex value in described database after modulation according to the binary data of bits of original data flow input and default modulating rule, and with this subscript as its index value;
B2, described index value pass through the computing of N intermediate link successively according to default operation rule, and acquisition final result value, and wherein, N is natural number and more than or equal to 1;
B3, described central processing unit with described final result value as the storage subscript, corresponding modulated complex value in the described database of direct index, wherein, in the computing of N intermediate link, the computing that index value carries out according to default operation rule is corresponding with the computing that the modulated complex value is carried out.
2. method according to claim 1 is characterized in that, among the described step B1, default modulating rule comprises one or more the compound mode in the modulation of quaternary phase shift keying, 16 modulus quadrature amplitude modulation, the 64 modulus quadrature amplitude modulation.
3. method according to claim 1 is characterized in that, described default operation rule comprise with the modulation complex values is carried out get the negative value computing, ask the conjugate complex number computing, signed magnitude arithmetic(al) that the computing of negate conjugate complex number is corresponding carries out index value.
4. method according to claim 1 is characterized in that, in the described steps A, described database contains:
First kind modulated complex value, it comprises modulates the rear modulated complex value that obtains to the bits of original data flow;
And N Equations of The Second Kind modulated complex value, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1.
5. method according to claim 2 is characterized in that, in the described steps A, described database is deposited the modulated complex value that is obtained in the baseband signal bit data flow processing procedure with the form of array or data file.
6. method according to claim 4 is characterized in that, in the described steps A, described database is deposited the modulated complex value that is obtained in the baseband signal bit data flow processing procedure with the form of array or data file;
N the Equations of The Second Kind modulated complex value that described first kind modulated complex value and this complex values obtain after N baseband signal intermediate treatment process is positioned in described array or the data file by preset order.
7. band signal processor, it is used for OFDM access system, it is characterized in that, comprising:
Memory module is used for setting up in advance a modulated complex Value Data storehouse, the modulated complex value that obtains in the record baseband signal bit data flow processing procedure, and the position that this modulated complex value leaves in the database is its corresponding index value;
Processing module, being used for the bits of original data stream modulates is index value corresponding to described database, obtains the modulated complex end value that prestores from described database according to index value;
Input module is used for described modulated complex end value is input to Fourier transformer or inverse Fourier transform device, carries out carrier modulation treatment,
Wherein, described processing module further comprises:
The first sub-processing module is used for binary data and default modulating rule according to the input of bits of original data flow, determines the storage subscript of modulated complex value in described database after modulation, and with this subscript as its index value;
The second sub-processing module is used for making described index value according to default operation rule, passes through successively the computing of N intermediate link, and acquisition final result value, and wherein, N is natural number and more than or equal to 1;
The 3rd sub-processing module, be used for described final result value as the storage subscript, corresponding modulated complex value in the described database of direct index, wherein, in the computing of N intermediate link, the computing that index value carries out according to default operation rule is corresponding with the computing that the modulated complex value is carried out.
8. device according to claim 7 is characterized in that, described memory module further comprises:
The first sub module stored is used for storage first kind modulated complex value, and it comprises modulates the rear modulated complex value that obtains to the bits of original data flow;
And second sub module stored, being used for N Equations of The Second Kind modulated complex value of storage, it comprises the end value of N baseband signal intermediate treatment process, N is natural number and more than or equal to 1.
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