CN104539391A - Subcarrier interleaving method of CDR modulation model - Google Patents
Subcarrier interleaving method of CDR modulation model Download PDFInfo
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- CN104539391A CN104539391A CN201410839999.9A CN201410839999A CN104539391A CN 104539391 A CN104539391 A CN 104539391A CN 201410839999 A CN201410839999 A CN 201410839999A CN 104539391 A CN104539391 A CN 104539391A
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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 subcarrier interleaving method of a CDR modulation model and relates to the digital information transmission technology. The subcarrier interleaving method of the CDR modulation model saves more storage resources and is higher in speed. The method is characterized in that subbands nature_subbands before data interleaving and the positions nature_addr of data in the subbands before data interleaving are obtained according to the sequence of received data, and the positions nature_addr are divided to obtain the positions nature_addr_sub; subbands subbands_inv after data interleaving are reckoned; addresses num_addr_inv after single subband internal interleaving are calculated; integer_addr is calculated; remain_addr is reckoned; storage addresses final_addr after interleaving of subcarriers are calculated through the formula final-addr = block_addr + integer_addr + remain_addr - add_addr.
Description
Technical field
The present invention relates to digital information transmission, relate to the Digital Implementation of the transmitting terminal modulator of CDR (Chinese Digital audio broadcasting) system.
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 ") proposes the basic framework of CDR (broadcast of China Digital Radio Chinese Digital) transmitting terminal modulator and realizes requirement, see Fig. 1, the CDR modulation module that standard proposes comprises main business data channel, business description data channel, system parameters passage, OFDM modulation module, logic framing module, scattered pilot module, beacon module, sub-frame allocation module, physical layer signal frame module and radio frequency modular converter, main business data channel, business description data channel and system parameters passage, scattered pilot module all has signal with OFDM modulation module and is connected, OFDM modulation module and beacon module all have signal with logical frame framing module and are connected, logical frame framing module, sub-frame allocation module, physical layer signal frame module and radio frequency modular converter are linked in sequence.
According to standard-required, main business data channel is provided with sub-carrier interleaving module, in business description data channel and system parameters passage, Bit interleaving block is set respectively.
Summary of the invention
Technical problem to be solved by this invention is: according to standard-required, provides one more to save storage resources, speed sub-carrier interleaving method faster.
The sub-carrier interleaving method of CDR modulation module provided by the invention, comprising:
Step 1: before obtaining data interlacing according to the sequencing receiving data, subband nature_subbands and data are arranged in the position nature_addr of the front subband that interweaves;
Step 2: carry out division according to position nature_addr piecemeal and obtain position nature_addr_sub, and obtain block block_flag;
Step 3: remove nature_addr_sub with cycle_num, obtains quotient quotient1 and residual value remain1; Cycle_num is the length of the cycle of data in three OFDM symbol in subband;
Step 4: before utilizing data interlacing, subband nature_subbands, quotient quotient1 and residual value remain1 calculate the subband subbands_inv after data interlacing;
Step 5: calculate the address num_addr_inv after interweaving in single subband according to the sequencing receiving data;
Step 6: remove nun_addr_sub with cycle_num, obtains quotient quotient2 and residual value remain2;
Step 7: calculate integer_addr=quotient2*cycle_num*N, N for transmission subband number;
Step 8: utilize subband subbands_inv, quotient quotient2 and residual value remain2 after interweaving to calculate remain_addr;
Step 9: utilize formula
final_addr＝block_addr+integer_addr+remain_addr-add_addr
Calculate the memory address final_addr after sub-carrier interleaving;
Wherein, block_flag is obtained according to following table:
By
By
Owing to have employed technique scheme, the invention has the beneficial effects as follows: present invention achieves the address computation that main business data subcarrier interweaves, simultaneously can the sub-carrier interleaving of compatible three kinds of transmission modes, adopt this method carry out sub-carrier interleaving without the need to data are stored but directly calculated data interweave after memory address, save memory space, improve processing speed and efficiency simultaneously.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the CDR modulation module that standard proposes;
Fig. 2 is the placement location of 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 transmission mode 1 time four subband intersection chart show;
Fig. 5 is transmission mode 1 time MSC data volume in each ofdm symbol;
Fig. 6 transmission mode 1 time 4 subband weaving flow journey figure.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
According to standard-required, CDR modulation module needs to carry out sub-carrier interleaving to main business data, carries out Bit Interleave to business description data and system parameter.
The realization of sub-carrier interleaving is divided into the intertexture of the Bit Interleave in single subband and multiple intersubband.If the just transfer of data of single subband, only complete the Bit Interleave in single subband, multiple subband data transmits the intertexture of intertexture and the intersubband then simultaneously completed in single subband, common are 2 subband transfer of data or 4 subband transfer of data.
Be implemented as follows: the transfer of data of single subband interweaves and realizes: the data interlacing algorithm in single subband is Bit Interleave algorithm, itself and business description data channel, the Bit Interleave algorithm of system parameters passage is identical.
If the list entries before interweaving is
wherein N
mUXfor the length of interleaving block, the output sequence after intertexture is:
then v
n=u
r (n), wherein R (n) can try to achieve according to following algorithm:
Wherein, p (0)=0,
P (i)=(5 ' p (i-1)+q) mods, (i ≠ 0),
q=s/4-1 formula 2
Here at transmission mode 1,2 times N
mUXvalue is 46080, and transmission mode 3 times values are 50688, by N
mUXbring formula 1 into, 2, obtain sequence and be respectively (0, 16383, 32762, 15603 ... 36045), (0, 16383, 32762, 49121 ... 36045), to two sequences be 0 stored in address respectively above, 1, 2 ... 46079, 0, 1, 2 ... in the array of 50687, be numerical value 0 by value in array, 1, 2 ... 46079, 0, 1, 2 ... 50687, corresponding address value takes out and forms new address sequence (0, 41520, 14074, 15173 ... 17921), (0, 45662, 15548, 5722 ... 2793), this address sequence is the new memory address of data through interweaving in subband or after Bit Interleave that order enters this interleaving block.
The intertexture of the transfer of data of multiple subband realizes: the realization that the transfer of data of multiple subband interweaves will complete the intertexture of intertexture in single subband and intersubband, here with transmission mode 1 (4 maximum subbands), whole interleaving process is described, Fig. 4 is seen in the interleaving data block position of each intersubband, in figure, 0 is business description data, the form indicating Arabic numerals 1,2,3,4 represents 4 subbands of actual intertexture (after interweaving), and " subband 1 ", " subband 2 ", " subband 3 " and " subband 4 " in form the first row represents the front subband that interweaves.
Before each actual intertexture subband data is distributed in and interweaves in subband, the data after intertexture are put from top to bottom with OFDM symbol number.The main business data of each subband data volume in each ofdm symbol as shown in Figure 5.
A upper module to the order of interleaving block transmitting data be interweave before subband 1 to subband 4, from top to bottom, from left to right come successively, be nature_subbands by front for intertexture subband, the position in the current sub-band of data place 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 N times in Fig. 3.In many subbands business datum interweaves, it enters intertexture in units of symbol, and the intertexture of 4 subbands is comparatively typical, its weaving length is 4 subbands of a logical frame.Be 46080 × 4 in the length of the next logical frame of transmission mode 1,2, the length of the next logical frame of transmission mode 3 is 50688 × 4.In transmission mode 1,2, according to the sequencing of data flow, transmission mode 3 times each subbands are related to that its data address is respectively (0 ~ 46079), (0 ~ 50687), and namely logical frame has 4 such circulation addresses.By address nature_addr quarter to produce address nature_addr_sub, its relation is as table one.
Table one nature_addr and nature_addr_sub quantitative relation
Current interlace subband subbands_inv is calculated by nature_addr_sub, the initial ranges of current data address place circulation fritter is calculated by formula 3, wherein cycle_num is the length of the cycle of main business data in every 3 OFDM symbol in subband, in transmission mode 1,3, get 640, in transmission mode 2, get 322.Remain1 is residual value.
Nature_addr_sub=quotient1*cycle_num+remain1 formula 3
After obtaining quotient quotient1 and residual value remain1, the occurrence of subbands_inv can be found by table two.In table two, quotient1 [1:0] gets the low 2 of 2 system numbers for quotient1.
Current interlace subband value under table two transmission mode 1
Remain1 value in table two is become (0 ~ 105; 106 ~ 213; Other value) namely obtain the occurrence of the subbands_inv under transmission mode 2; Remain1 value in table two is become (0 ~ 213; 214 ~ 427; Other value) namely obtain the occurrence of the subbands_inv under transmission mode 3.
The method calculating final interleaving address due to transmission mode 1,2,3 is afterwards similar, and this paper is main sets forth interleaving address generation method for transmission mode 1.The front address of intertexture due to each subband is (0,1,2 ... 46079) (have here 4 such address), try to achieve each subband data according to the method interweaved in aforementioned subband and carry out the rear address (0,41520,14074,15173 that interweaves that interweaves in single subband to obtain ... 17921), represent with num_addr_inv.Here in order to ensure the interleaving address producing data continuously, the mode of tabling look-up can be adopted to generate interleaving address num_addr_inv.
Because the actual intertexture subband after intertexture in subband residing for it does not become, and main business data volume is with the circulation of (214,212,214) in each OFDM symbol row in list band, so (main business data address counts the final address in the OFDM symbol at data place after can calculating intertexture easily according to actual intertexture subband (0,1,2,3) and the interleaving address in this subband thereof in OFDM symbol row from 0 here, from left to right, increase progressively from top to bottom, be not counted in the OFDM symbol row of dereliction business datum).
Can obtain quotient quotient2 by formula 4 and residual value remain2, quotient2 have how many cycle_num (transmission mode gets 640 1 time) in single subband, remain2 is remainder.
The final interleaving address generated of order is final_addr again, is calculated by formula 6.Block_addr wherein has formula 7 to obtain, and add_addr is obtained by formula 8.Integer_addr is the cycle_num × N of integral multiple, N is subband number, gets 4 in the present embodiment.Integer_addr through type 5 calculates.
Remain_addr tables look-up according to quotient quotient2 and residual value remain2 and three to obtain.
Transmission mode 2,3 times, remain_addr obtains according to table four, table five respectively, and notice that its part OFDM symbol row has CIC data (as Fig. 3), final remain_addr value should deduct this part data volume, other and transmission mode 1 are similar, state no longer in detail here.
Num_addr_inv=quotient2*cycle_num+remain2 formula 4;
Integer_addr=quotient2*cycle_num*N formula 5;
Final_addr=block_addr+integer_addr+remain_addr-add_addr formula 6;
Remain_addr exploitation in table three transmission mode 1
Remain_addr exploitation in table four transmission mode 2
Remain_addr exploitation in table five transmission mode 3
Data after final intertexture in address are OFDM symbol from left to right, are arranged in order desired data from top to bottom.Concrete intertexture flow process is shown in Fig. 6.The data interlacing of multiple subbands of transmission mode 2,3 is similar.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (4)
1. a sub-carrier interleaving method for CDR modulation module, is characterized in that, comprising:
Step 1: before obtaining data interlacing according to the sequencing receiving data, subband nature_subbands and data are arranged in the position nature_addr of the front subband that interweaves;
Step 2: carry out skew according to position nature_addr piecemeal and obtain position nature_addr_sub, and obtain block block_flag;
Step 3: remove nature_addr_sub with cycle_num, obtains quotient quotient1 and residual value remain1; Cycle_num is the length of the cycle of data in three OFDM symbol in subband;
Step 4: before utilizing data interlacing, subband nature_subbands, quotient quotient1 and residual value remain1 calculate the subband subbands_inv after data interlacing;
Step 5: calculate the address num_addr_inv after interweaving in single subband according to the sequencing receiving data;
Step 6: remove nun_addr_sub with cycle_num, obtains quotient quotient2 and residual value remain2;
Step 7: calculate integer_addr=quotient2*cycle_num*N, N for transmission subband number;
Step 8: utilize subband subbands_inv, quotient quotient2 and residual value remain2 after interweaving to calculate remain_addr;
Step 9: utilize formula
final_addr＝block_addr+integer_addr+remain_addr-add_addr
Calculate the memory address final_addr after sub-carrier interleaving;
Wherein, block_flag is obtained according to following table:
By
obtain block_addr;
By
obtain add_addr.
2. the sub-carrier interleaving method of a kind of CDR modulation module according to claim 1, it is characterized in that, described step 2 comprises further: or described step 2 comprises further: 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;
Or described step 2 comprises further: 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;
Or described step 2 comprises further: 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.
3. the sub-carrier interleaving method of a kind of CDR modulation module according to claim 1, is characterized in that, step 4 calculates the subband subbands_inv after data interlacing according to following table relation:
wherein during transmission mode 1, R1 equals 0 ~ 213, R2 and equals 214 ~ 425, R3 and equal 426 ~ 639; During transmission mode 2, R1 equals 0 ~ 105, R2 and equals 106 ~ 213, R3 and equal 214 ~ 321; During transmission mode 3, R1 equals 0 ~ 213, R2 and equals 214 ~ 427, R3 and equal 428 ~ 639; Quotient1 [1:0] gets the low 2 of binary number for quotient1.
4. the sub-carrier interleaving method of a kind of CDR modulation module according to claim 1, is characterized in that, when transmission mode 1, described step 8 calculates remain_addr according to following table relation:
wherein quotient2 [1:0] gets the low 2 of binary number for quotient2.
When transmission mode 2, described step 8 calculates remain_addr according to following table relation:
wherein quotient2 [1:0] gets the low 2 of binary number for quotient2;
When transmission mode 3, described step 8 calculates remain_addr according to following table relation:
wherein quotient2 [1:0] gets the low 2 of binary number for quotient2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013023594A1 (en) * | 2011-08-17 | 2013-02-21 | 国家广播电影电视总局广播科学研究院 | Method and device for transmitting and receiving digital audio signal in digital audio broadcasting system |
| 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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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013023594A1 (en) * | 2011-08-17 | 2013-02-21 | 国家广播电影电视总局广播科学研究院 | Method and device for transmitting and receiving digital audio signal in digital audio broadcasting system |
| 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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