CN104539391B - A kind of sub-carrier interleaving method of CDR modulation modules - Google Patents
A kind of sub-carrier interleaving method of CDR modulation modules Download PDFInfo
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- CN104539391B CN104539391B CN201410839999.9A CN201410839999A CN104539391B CN 104539391 B CN104539391 B CN 104539391B CN 201410839999 A CN201410839999 A CN 201410839999A CN 104539391 B CN104539391 B CN 104539391B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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Abstract
The invention discloses a kind of sub-carrier interleaving method of CDR modulation modules, it is related to digital information transmission technical, it is desirable to provide a kind of more to save storage resource, the faster sub-carrier interleaving method of speed.Technical key point：According to the sequencing for receiving data, position nature_addrs of the subband nature_subbands with data before interweaving in subband before data interlacing is obtained；Position nature_addr is divided to obtain position nature_addr_sub；Calculate the subband subbands_inv after data interlacing；Calculate the address num_addr_inv after interweaving in single subband；Calculate integer_addr；Calculate remain_addr；The storage address final_addr after sub-carrier interleaving is calculated using formula final_addr=block_addr+integer_addr+remain_addr add_addr.
Description
Technical field
The present invention relates to digital information transmission, it is related to the transmitting terminal modulator of CDR (Chinese Digital audio broadcasting) system
Digital Implementation.
Background technology
OFDM：OFDM；
LDPC：Low density parity check code；
CDR：Chinese Digital audio broadcasting；
MSC：Main business passage；
CIC：Business description passage；
CPT：System configuration information.
" People's Republic of China's radio, film and television industry standard " GY/T 268.1-2013 (hereinafter referred to as " standard ")
Propose the basic framework of CDR (broadcast of China Digital Radio Chinese Digitals) transmitting terminal modulator and realize and require, ginseng
See Fig. 1, the CDR modulation modules that standard proposes include main business data channel, business description data channel, systematic parameter passage,
OFDM modulation modules, logic framing module, scattered pilot module, beacon module, subframe distribute module, physical layer signal frame module
And radio frequency modular converter, main business data channel, business description data channel and systematic parameter passage, scattered pilot module are equal
With OFDM modulation modules there is signal to be connected, OFDM modulation modules and beacon module are respectively provided with signal company with logical frame framing module
Connect, logical frame framing module, subframe distribute module, physical layer signal frame module and radio frequency modular converter are linked in sequence.
Required according to standard, main business data channel is provided with sub-carrier interleaving module, in business description data channel
And Bit interleaving block is set respectively in systematic parameter passage.
The content of the invention
The technical problems to be solved by the invention are：Required according to standard, there is provided a kind of more to save storage resource, speed
Faster sub-carrier interleaving method.
The sub-carrier interleaving method of CDR modulation modules provided by the invention, including：
Step 1：Sequencing according to data are received obtains subband nature_subbands and data bit before data interlacing
Position nature_addr in subband before intertexture；
Step 2：Divided to obtain position nature_addr_sub according to position nature_addr piecemeals, and obtain block
Number block_flag；
Step 3：Nature_addr_sub is removed with cycle_num, obtains quotient quotient1 and residual value remain1；
Cycle_num is length of the cycle of the data in three OFDM symbols in subband；
Step 4：Pushed away using subband nature_subbands, quotient quotient1 and residual value remain1 before data interlacing
Calculate the subband subbands_inv after data interlacing；
Step 5：Sequencing according to data are received calculates the address num_addr_inv after interweaving in single subband；
Step 6：Nun_addr_sub is removed with cycle_num, obtains quotient quotient2 and residual value remain2；
Step 7：Integer_addr=quotient2*cycle_num*N is calculated, N is transmission subband number；
Step 8：Calculated using the subband subbands_inv after intertexture, quotient quotient2 and residual value remain2
remain_addr；
Step 9：Utilize formula
Final_addr=block_addr+integer_addr+remain_addr-add_addr
The storage address final_addr after sub-carrier interleaving is calculated；
Wherein, block_flag is obtained according to following table：
By
By
By adopting the above-described technical solution, the beneficial effects of the invention are as follows：The present invention realizes main business data and carried
The address computation that ripple interweaves, while it is capable of the sub-carrier interleaving of compatible three kinds of transmission modes, subcarrier friendship is carried out using this method
Storage address after knitting without being stored to data but directly calculating data interlacing, saves memory space, improves simultaneously
Processing speed and efficiency.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the CDR modulation modules that standard proposes；
Fig. 2 is placement locations of the CIC in subcarrier matrix under each transmission mode；
Fig. 3 is the symbolic number of MSC and CIC under each transmission mode；
Fig. 4 is that 1 lower four subband intersection chart of transmission mode shows；
Fig. 5 is the data volumes of 1 time MSC of transmission mode in each ofdm symbol；
1 lower 4 subband weaving flow journey figure of Fig. 6 transmission modes.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent by other or with similar purpose
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
Required according to standard, CDR modulation modules need to carry out sub-carrier interleaving to main business data, to business description data
Bit Interleave is carried out with systematic parameter.
The realization of sub-carrier interleaving is divided into the intertexture of the Bit Interleave and multiple intersubbands in single subband.It is if simply single
The data transfer of individual subband then only completes the Bit Interleave in single subband, and multiple subband data transmission then complete single son simultaneously
The intertexture of intertexture and intersubband in band, common are 2 subband data transfers or 4 subband data transfers.
It is implemented as follows：The data transfer of single subband, which interweaves, to be realized：Data interlacing algorithm in single subband be than
Special interleaving algorithm, itself and business description data channel, the Bit Interleave algorithm of systematic parameter passage are identical.
If the list entries before interweaving isWherein NMUXFor the length of interleaving block, hand over
Output sequence after knitting is：Then vn=uR(n), wherein R (n) can be according to following algorithm
Try to achieve：
Wherein, p (0)=0,
P (i)=(5 ' p (i-1)+q) mods, (i ≠ 0),Q=s/4-1 formulas 2
Here in transmission mode 1,2 times NMUXValue is 46080, and 3 times values of transmission mode are 50688, by NMUXBring public affairs into
Formula 1,2, obtain sequence respectively (0,16383,32762,15603 ... 36045), (0,16383,32762,49121 ...
36045) it, two sequences will respectively be stored in the array that address is 0,1,2 ... 46079,0,1,2 ... 50687, will be taken in array above
Be worth for numerical value 0,1,2 ... 46079,0,1,2 ... 50687, corresponding address value take out to be formed new address sequence (0,41520,
14074th, 15173 ... 17921), (0,45662,15548,5722 ... 2793), and the address sequence is that order enters the intertexture mould
The data of block are by intertexture in subband or the new storage address after Bit Interleave.
The intertexture of the data transfer of multiple subbands is realized：The realization that the data transfer of multiple subbands interweaves will complete single son
The intertexture of intertexture and intersubband in band, whole interleaving process is illustrated with transmission mode 1 (most 4 subbands) here, respectively
Fig. 4 is seen in the interleaving data block position of individual intersubband, and 0 is business description data in figure, indicates Arabic numerals 1,2,3,4
Form represents 4 subbands of actual intertexture (after intertexture), " subband 1 ", " subband 2 ", " subband 3 " and " son in form the first row
Band 4 " represents subband before intertexture.
Each actual intertexture subband data is distributed in before intertexture in subband, the data after intertexture with OFDM symbol number on to
Under put.The data volume of the main business data of each subband in each ofdm symbol is as shown in Figure 5.
The order that a upper module launches data to interleaving block is to arrive subband 4 with subband before intertexture 1, from top to bottom, from a left side
Come successively to right, be nature_subbands by subband before intertexture, the position in data place current sub-band is designated as
nature_addr.Data in Fig. 4 in each clinodiagonal are actual intertexture subband, and the main business amount of N number of subband is then Fig. 3
In N times.In more subband business datums intertexture, it enters what is interweaved in units of symbol, the intertexture more allusion quotation of 4 subbands
Type, its weaving length are 4 subbands of a logical frame.It is 46080 × 4 in transmission mode 1, the length of 2 next logical frames,
The length of 3 next logical frame of transmission mode is 50688 × 4.Each subband is according to number under transmission mode 1,2, transmission mode 3
It is related to that its data address is respectively (0~46079) according to the sequencing of stream, (0~50687), i.e. a logical frame there are 4 so
Circulation address.By address nature_addr quarters to produce address nature_addr_sub, its relation such as table one.
The nature_addr of table one and nature_addr_sub quantitative relations
Current intertexture subband subbands_inv is calculated by nature_addr_sub, by formula 3 with calculating current data
The initial ranges of circulation fritter where location, wherein cycle_num are main business data following in every 3 OFDM symbols in subband
Ring length, 640 are taken in transmission mode 1,3,322 are taken in transmission mode 2.Remain1 is residual value.
Nature_addr_sub=quotient1*cycle_num+remain1 formulas 3
After obtaining quotient quotient1 and residual value remain1, subbands_inv occurrence can be found by table two.Table
Quotient1 [1 in two:0] low 2 of 2 system numbers are taken for quotient1.
Current intertexture subband value under the transmission mode 1 of table two
Remain1 values in table two are changed into (0~105；106~213；Other values) obtain under transmission mode 2
Subbands_inv occurrence；Remain1 values in table two are changed into (0~213；214~427；Other values) obtain
The occurrence of subbands_inv under transmission mode 3.
The method for calculating final interleaving address afterwards due to transmission mode 1,2,3 is similar, herein mainly with transmission mode 1
Exemplified by illustrate interleaving address generation method.Because the preceding address of the intertexture of each subband is that (0,1,2 ... 46079) (share 4 here
Individual such address), try to achieve each subband data according to the method to interweave in foregoing subband and interweave and must hand in single subband
Rear address (0,41520,14074,15173 ... 17921) is knitted, is represented with num_addr_inv.Here in order to ensure to continuously generate
The interleaving address of data, interleaving address num_addr_inv can be generated by the way of tabling look-up.
Because the actual intertexture subband after interweaving in subband residing for it does not become, and main business data volume exists in list band
It is with the circulation of (214,212,214), so according to actual intertexture subband (0,1,2,3) and its at this in each OFDM symbol row
Interleaving address in subband can easily calculate interweave after data where OFDM symbol in final address (lead here
Business datum address starts counting up in OFDM symbol row from 0, from left to right, is incremented by from top to bottom, is not counted in no main business number
According to OFDM symbol row).
It is that how many is individual in single subband that can obtain quotient quotient2 and residual value remain2, quotient2 by formula 4
Cycle_num (takes 640) under transmission mode 1, and remain2 is remainder.
It is final_addr to make the interleaving address ultimately generated again, is calculated by formula 6.Block_addr therein has formula
7 are obtained, and add_addr is obtained by formula 8.Integer_addr is cycle_num × N of integral multiple, and N is subband number, this implementation
4 are taken in example.Integer_addr is calculated by formula 5.
Remain_addr tables look-up according to quotient quotient2 and residual value remain2 and three obtained.
Under transmission mode 2,3, remain_addr obtains according to table four, table five respectively, pays attention to its part OFDM symbol row
There are CIC data (such as Fig. 3), final remain_addr values should subtract this partial data amount, other similar with transmission mode 1, here
No longer statement in detail.
Num_addr_inv=quotient2*cycle_num+remain2 formulas 4；
Integer_addr=quotient2*cycle_num*N formulas 5；
Final_addr=block_addr+integer_addr+remain_addr-add_addr formulas 6；
Remain_addr exploitations in the transmission mode 1 of table three
Remain_addr exploitations in the transmission mode 2 of table four
Remain_addr exploitations in the transmission mode 3 of table five
It is final interweave after data in address be OFDM symbol from left to right, be arranged in order required data from top to bottom.
Specific intertexture flow is shown in Fig. 6.The data interlacing of multiple subbands of transmission mode 2,3 is similar.
The invention is not limited in foregoing embodiment.The present invention, which expands to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (1)
- A kind of 1. sub-carrier interleaving method of CDR modulation modules, it is characterised in that including：Step 1：Subband nature_subbands is located at friendship with data before sequencing according to data are received obtains data interlacing Position nature_addr before knitting in subband；Step 2：Line displacement is entered according to position nature_addr piecemeals and obtains position nature_addr_sub, and obtains block number block_flag；Step 3：Nature_addr_sub is removed with cycle_num, obtains quotient quotient1 and residual value remain1； Cycle_num is length of the cycle of the data in three OFDM symbols in subband；Step 4：Number is calculated using subband nature_subbands, quotient quotient1 before data interlacing and residual value remain1 According to the subband subbands_inv after intertexture；Step 5：Sequencing according to data are received calculates the address num_addr_inv after interweaving in single subband；Step 6：Nun_addr_inv is removed with cycle_num, obtains quotient quotient2 and residual value remain2；Step 7：Integer_addr=quotient2*cycle_num*N is calculated, N is transmission subband number；Step 8：Remain_ is calculated using the subband subbands_inv after intertexture, quotient quotient2 and residual value remain2 addr；Step 9：Utilize formulaFinal_addr=block_addr+integer_addr+remain_addr-add_addrThe storage address final_addr after sub-carrier interleaving is calculated；Wherein, block_flag is obtained according to following table：ByByThe step 2 further comprises：During transmission mode 1, if position nature_addr belongs to 0~11519 scope, nature_ Addr_sub=nature_addr；If position nature_addr belongs to 11520~23039 scopes, nature_addr_sub= nature_addr-11520；If position nature_addr belongs to 23040~34559 scopes, nature_addr_sub= nature_addr-23040；If position nature_addr belongs to 34560~46079 scopes, nature_addr_sub= nature_addr-34560；During transmission mode 2, if position nature_addr belongs to 0~11519 scope, nature_addr_sub=nature_ addr+72；If position nature_addr belongs to 11520~23039 scopes, nature_addr_sub=nature_addr- 11448；If position nature_addr belongs to 23040~34559 scopes, nature_addr_sub=nature_addr- 22968；If position nature_addr belongs to 34560~46079 scopes, nature_addr_sub=nature_addr- 34488；During transmission mode 3, if position nature_addr belongs to 0~12671 scope, nature_addr_sub=nature_ addr+128；If position nature_addr belongs to 12672~25343 scopes, nature_addr_sub=nature_addr- 12544；If position nature_addr belongs to 25344~38015 scopes, nature_addr_sub=nature_addr- 25216；If position nature_addr belongs to 38016~50687 scopes, nature_addr_sub=nature_addr- 37888,Step 4 calculates the subband subbands_inv after data interlacing according to following table relation：；Wherein transmission mode 1 when, R1 be equal to 0~213, R2 be equal to 214~425, R3 be equal to 426~639；During transmission mode 2, R1 It is equal to 106~213, R3 equal to 0~105, R2 and is equal to 214~321；During transmission mode 3, R1 be equal to 0~213, R2 be equal to 214~ 427, R3 are equal to 428~639；quotient1[1:0] low 2 of binary number are taken for quotient1,In transmission mode 1, the step 8 calculates remain_addr according to following table relation：；Wherein quotient2 [1:0] low 2 of binary number are taken for quotient2,In transmission mode 2, the step 8 calculates remain_addr according to following table relation：；Wherein quotient2 [1:0] low 2 of binary number are taken for quotient2；In transmission mode 3, the step 8 calculates remain_addr according to following table relation：；Wherein quotient2 [1:0] low 2 of binary number are taken for quotient2.
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| CN103297173A (en) * | 2012-02-24 | 2013-09-11 | 国家广播电影电视总局广播科学研究院 | Method and device for transmission, distribution and receiving of data of digital audio broadcasting system in China |
| CN103873191A (en) * | 2012-12-14 | 2014-06-18 | 北京北广科技股份有限公司 | Digital audio broadcasting subcarrier matrix processing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103297173A (en) * | 2012-02-24 | 2013-09-11 | 国家广播电影电视总局广播科学研究院 | Method and device for transmission, distribution and receiving of data of digital audio broadcasting system in China |
| CN103873191A (en) * | 2012-12-14 | 2014-06-18 | 北京北广科技股份有限公司 | Digital audio broadcasting subcarrier matrix processing method and device |
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