CN107204828A - The intertexture mapping method and deinterleaving de-mapping method of LDPC code word - Google Patents

The intertexture mapping method and deinterleaving de-mapping method of LDPC code word Download PDF

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Publication number
CN107204828A
CN107204828A CN201710408189.1A CN201710408189A CN107204828A CN 107204828 A CN107204828 A CN 107204828A CN 201710408189 A CN201710408189 A CN 201710408189A CN 107204828 A CN107204828 A CN 107204828A
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bit
ldpc code
code word
value data
soft value
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Inventor
张文军
赵杰
史毅俊
徐胤
徐洪亮
何大治
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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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
    • 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
    • H04L1/0057—Block codes
    • 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
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points

Abstract

The intertexture mapping method and deinterleaving de-mapping method of a kind of LDPC code word, including the check part progress first time Bit Interleave in LDPC code word is obtained into check bit stream；Information bit part in LDPC code word and check bit stream are spliced into the LDPC code word after first time Bit Interleave；LDPC code word after first time Bit Interleave is divided into the put in order LDPC code word to be formed second Bit Interleave after of the continuous multiple sub-blocks of bits by corresponding bit exchange pattern change sub-blocks of bits by predetermined length；The LDPC code word for sequentially reading and obtaining after third time Bit Interleave by the LDPC code word column major order write-in after second of Bit Interleave and by going；LDPC code word after third time Bit Interleave is carried out constellation mapping to obtain symbol stream according to planisphere.Systematic function is set preferably to be lifted for different LDPC code table selection intertexture mappings and deinterleaving de-mapping method.

Description

The intertexture mapping method and deinterleaving de-mapping method of LDPC code word
The application is the divisional application of original bill, the application number 201410409149.5 of original bill, 2014 applyings date August 19 Day, invention and created name " the intertexture mapping method and deinterleaving de-mapping method of LDPC code word ".
Technical field
The present invention relates to digital TV technology, the intertexture and mapping method and solution of more particularly to a kind of LDPC code word are handed over Knit de-mapping method.
Background technology
In existing broadcast communication standard, LDPC codings, Bit Interleave and constellation mapping are that most commonly seen coding is adjusted Mode processed.In different emission systems, LDPC codings, Bit Interleave and constellation mapping are required for individually designed, and combine Debugging, to obtain best channel performance.Therefore, how for specific LDPC code word and constellation mapping mode formation specific aim Bit Interleave, be a technical barrier of this area.
The content of the invention
The problem of present invention is solved is can not to be formed in the prior art for specific LDPC code word and constellation mapping mode Targetedly Bit Interleave.
To solve the above problems, the embodiments of the invention provide a kind of intertexture of LDPC code word and mapping method, including such as Lower step：Check part in the LDPC code word is carried out first time Bit Interleave to obtain check bit stream；Will be described Information bit part in LDPC code word is spliced into the LDPC code word after first time Bit Interleave with the check bit stream；By institute State the LDPC code word after first time Bit Interleave and be divided into continuous multiple sub-blocks of bits by predetermined length, and according to corresponding bit Sub-blocks of bits puts in order to form the LDPC code word after second of Bit Interleave described in exchange pattern change；By described second LDPC code word column major order after secondary Bit Interleave writes memory space and read by row order out of this memory space to obtain LDPC code word after third time Bit Interleave；LDPC code word after the third time Bit Interleave is entered according to corresponding planisphere Planetary maps to obtain symbol stream.
The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word, comprises the following steps：To symbol Number stream soft value data carry out soft de-mapped processing to obtain bit soft value data according to corresponding planisphere；Wherein described symbol stream Soft value data are that receiving terminal receives the symbol stream that the intertexture mapping method of LDPC code word described above is obtained；The bit is soft Value Data is sequentially written in memory space by row and column major order reads to obtain comparing deinterleave for the first time out of this memory space Bit soft value data afterwards；The first time is divided into continuous many than the bit soft value data after deinterleave by predetermined length Individual bit soft value data sub-block, and putting in order according to bit soft value data sub-block described in corresponding bit exchange pattern change To form second than the bit soft value data after deinterleave；By described second than the bit soft value data after deinterleave In correspond to LDPC code word in check part bit soft value data carry out third time than deinterleave with obtain third time compare Bit soft value data after deinterleave；By described second than in the bit soft value data after deinterleave with the third time Bit soft value data flow is spliced into than the bit soft value data after deinterleave；LDPC is carried out to the bit soft value data flow to translate Code handles to obtain decoded bitstream data.
Compared with prior art, technical solution of the present invention has advantages below：
For the corresponding intertexture mapping of specific LDPC code table selection and deinterleaving de-mapping method so that systematic function Preferably lifted.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of the embodiment of the intertexture mapping method of LDPC code word of the present invention；
Fig. 2 is a kind of flow signal of the embodiment of the deinterleaving de-mapping method of LDPC code word of the present invention Figure；
Fig. 3 is to carry out the to the check part in LDPC code word in a kind of intertexture mapping method of LDPC code word of the present invention Bit Interleave is to obtain the schematic diagram of check bit stream；
Fig. 4 be the present invention a kind of LDPC code word intertexture mapping method according to bit described in bit exchange pattern change The schematic diagram put in order of sub-block.
Embodiment
Inventor has found in the prior art, it is impossible to for specific LDPC code word and constellation mapping mode formation targetedly Bit Interleave.
In view of the above-mentioned problems, inventor is by research, there is provided a kind of intertexture mapping method of LDPC code word and deinterleaving De-mapping method, de-mapping method is mapped and deinterleaves so that systematicness for the different corresponding intertextures of LDPC code table selection Can preferably it be lifted.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention Embodiment be described in detail.
In embodiments of the present invention, transmitter terminal is：The bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code is input to first LDPC encoder carries out the coding of the LDPC code word of specific code check code length, and input bit interleaver, specific according to certain afterwards Bit Interleave patterning method is interleaved processing, and the data after then Bit Interleave is handled carry out the 1024QAM of correspondence code check Constellation mapping, is modulated afterwards, transmitting, undergoes channel.Receiver end is：Data after channel are demodulated, so Data input De-mapping module after demodulating afterwards, carries out 1024QAM demappings.The bit soft value that De-mapping module is exported afterwards Information is input to de-interleaving block and is deinterleaved, and ldpc decoder is output to afterwards, and it is carried out to be based on specific LDPC code The decoding of word, finally decodes output bit flow.
As shown in Fig. 1 a kind of flow of the embodiment of the intertexture mapping method of LDPC code word of the invention is shown It is intended to.With reference to Fig. 1, the intertexture mapping method of LDPC code word comprises the following steps：
Step S11：Check part in the LDPC code word is carried out first time Bit Interleave to obtain check bit stream；
Step S12：Information bit part in the LDPC code word and the check bit stream are spliced into and compared for the first time LDPC code word after spy's intertexture；
Step S13：LDPC code word after the first time Bit Interleave is divided into continuous multiple bits by predetermined length Sub-block, and putting in order to be formed after second of Bit Interleave according to sub-blocks of bits described in corresponding bit exchange pattern change LDPC code word；
Step S14：By the LDPC code word column major order write-in memory space after second of Bit Interleave and by capable suitable Sequence reads to obtain the LDPC code word after third time Bit Interleave out of this memory space；
Step S15：Constellation mapping is carried out according to corresponding planisphere to the LDPC code word after the third time Bit Interleave To obtain symbol stream.
In the present embodiment, the step S11 specifically includes following steps：Check part in the LDPC code word is pressed Row are sequentially written in memory space and read by row order out of this memory space to obtain check bit stream.
Specifically, Bit Interleave is carried out to the test portion for generating LDPC code word：The common M ratio of check part of LDPC code word Spy, is write in a memory space by row, Q bit of each column, common L row, that is to say, that M=Q*L, is then sequentially read by row. Its specific implementation process is with reference to shown in Fig. 3.
In the step S13, the LDPC code word after the first time Bit Interleave is divided into continuously by predetermined length Multiple sub-blocks of bits, wherein the predetermined length is 320.Further, compare according to described in corresponding bit exchange pattern change Special sub-block puts in order to form the LDPC code word after second of Bit Interleave.Its detailed process is detailed as shown in Figure 4, in Fig. 4 In, (m0,m1,...,mN/320-1) be 320 length bits sub-blocks bit exchange pattern.
Specifically, the code length of the LDPC code word in LDPC code table is 57600, and corresponding bit exchange pattern is：
It should be noted that in the present embodiment, each numerical value in the bit exchange pattern refers to without bit The position of the sub-blocks of bits before exchanging.For example, second implication of numerical value 18 in above-mentioned bit exchange pattern referred to originally not Nowadays become second sub-blocks of bits after bit exchange by the 19th sub-blocks of bits before bit exchange.
Planisphere is accordingly：
In the step S14, for example, for code length for 57600 bits LDPC code word (after second of Bit Interleave LDPC code word), its column major order is write into memory space and read by row order out of this memory space, wherein each column 5760 Bit, 10 is arranged totally.
Afterwards to the bitstream data (b after above-mentioned Bit Interleave0, b1,...,bN-1), according to 1024QAM planispheres, every ten Decimal number corresponding to individual binary bit sequence is mapped to some constellation point, obtains symbol stream (each complex symbol pair Answer a constellation point).For example, ten bits ' 0000001101 ' correspondence decimal number of input is 13, then 1024QAM is corresponded to The constellation point of 1.0579+0.9302i in planisphere, the constellation point being shown as on real number axis and axis of imaginaries, real number axis 1.0579, axis of imaginaries 0.9302.Then generation OFDM symbol is carried out using symbol stream in modulation module, finally launched.
In the present embodiment, the LDPC code word is obtained after specific LDPC codings are flowed through to the bit after message sink coding Arrive, wherein the specific LDPC codings can be realized using prior art.
Specifically, the code word of the LDPC is with L × L (L is usually 320) for sub-block size, and code table is as follows：
The code check 2/3N of table 1ldpc=57600, L × L=320 × 320, Q=60, M=19200
Its coding method is as follows：
By the bit stream after message sink coding, block of information one by one is split as, each block of information is made up of K information bit, It is expressed as S=(s0,s1,...,sK-1).By the specific LDPC codings in Fig. 1, being will be according to S=(s0,s1,...,sK-1) generation M Individual check bit P=(p0,p1,...,pM-1).Obtain code word Λ=(λ of N number of bit0, λ1..., λN-1), wherein N=K+ M.Λ can be expressed as again, Λ=(s0,s1,...,sK-1,p0, p1..., pM-1)。
The step of coding is：
1) λ is initializedi=si, i=0,1 ..., K-1.pj=0, j=0,1 ..., M-1
2) to information bit λ0, to being tired out with the first row numeral in code table for the check bit of address
Plus, the code check 2/3 of table 1 is lifted, exemplified by the code table of code length 57600：
3) for ensuing L-1 information bit (usual L=320), λm, m=1,2 ..., L-1, by each information Bit according to following y for the check bit of address respectively with being added up：
Y={ x+ (m mod 320) × Q } mod M.
Wherein, x refers to and λ0Related verification bit address, is lifted exemplified by table 1, x is the numeral of the first row in code table：
49 426 965 1357 1861 4529 4580 5098 5210 5713 5775 6059 6325 6818 6934 7032 7223 8191 8534 8697 8756 9791 10588 11034 11102 12353 13039 14661 14801 15130 15652 15742 16287 17708 18228 18516 18796。
And whereinM is the quantity of check bit, is also the quantity of check matrix row, and L is sub-block in check matrix Size, usually 320.
Code word for table 1 is example,
4) for l-th information bit λL, check bit is added up according to the second line number word address in code table.Together Sample for l-th information bit LLEnsuing L-1 information bit, continue according to step 3) in formula to check bit Added up, at this time the x of the formula of step 3 kind is the numeral of the second row in code table.
5) similarly, for the individual information bits of 2L, 3L, 4L ... iL ..., according in code table distinguish the 3rd, 4,5 ..., (i+1) L.... capable address is added up to check bit, and L-1 information bit after its information bit is then respectively according to step 3) formula in is added up to check bit, note the x of the at this time formula of step 3 kind it is corresponding be current i-th L letter Cease the row in the code table corresponding to bit, such as L-1 bit after i-th L information bit, its applying step 3) in public affairs When formula corresponding x address be code table in (i+1) OK.
6) step 5 is finished) after, it is done as follows：
Wherein i=1,2,3 ... ..., M-1.
The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word.As shown in Fig. 2 this hair A kind of schematic flow sheet of the embodiment of the deinterleaving de-mapping method of bright LDPC code word.With reference to Fig. 2, LDPC code word Deinterleaving de-mapping method comprise the following steps：
Step S21：Soft de-mapped is carried out according to corresponding planisphere to symbol stream soft value data and handles soft to obtain bit Value Data；
Step S22：The bit soft value data are sequentially written in memory space and column major order from the memory space by row It is interior to read to obtain for the first time than the bit soft value data after deinterleave；
Step S23：The first time is divided into continuous many than the bit soft value data after deinterleave by predetermined length Individual bit soft value data sub-block, and putting in order according to bit soft value data sub-block described in corresponding bit exchange pattern change To form second than the bit soft value data after deinterleave；
Step S24：By second of school than corresponding in the bit soft value data after deinterleave in LDPC code word The bit soft value data for testing part carry out third time than deinterleave to obtain third time than the bit soft value number after deinterleave According to；
Step S25：By described second than being handed in the bit soft value data after deinterleave with the third time than particular solution Bit soft value data after knitting are spliced into bit soft value data flow；
Step S26：LDPC decodings processing is carried out to the bit soft value data flow to obtain decoded bitstream data.
In the present embodiment, the step S24 is specifically included：By described second than the bit soft value number after deinterleave The bit soft value data of the check part corresponded in LDPC code word by row be sequentially written in memory space and column major order from Read to obtain third time than the bit soft value data after deinterleave in the memory space.
It by above-mentioned LDPC coding, intertexture and modulation system, can reach thresholding of the system under awgn channel 21.54, the thresholding under rayleigh fading channel reaches 24.54, can effectively increase coverage rate.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (7)

1. a kind of intertexture mapping method of LDPC code word, it is characterised in that comprise the following steps：
Check part in the LDPC code word is carried out first time Bit Interleave to obtain check bit stream；
Information bit part in the LDPC code word and the check bit stream are spliced into after first time Bit Interleave LDPC code word；
LDPC code word after the first time Bit Interleave is divided into continuous multiple sub-blocks of bits by predetermined length, and according to phase Sub-blocks of bits described in the bit exchange pattern change answered puts in order to form the LDPC code word after second of Bit Interleave；
LDPC code word column major order after second of Bit Interleave is write into memory space, and by row sequentially from the storage Read in space, obtain the LDPC code word after third time Bit Interleave；And
Constellation mapping is carried out to obtain symbol stream according to corresponding planisphere to the LDPC code word after the third time Bit Interleave,
Wherein, the LDPC code table of the bit exchange pattern and the planisphere all from different code checks is corresponding.
2. the intertexture mapping method of LDPC code word as claimed in claim 1, it is characterised in that by the school in the LDPC code word Part is tested to carry out first time Bit Interleave to specifically include the step of obtaining check bit stream：
Check part column major order in the LDPC code word is write into memory space, and by row order out of described memory space Read, to obtain check bit stream.
3. the intertexture mapping method of LDPC code word as claimed in claim 1, it is characterised in that the predetermined length is 320 ratios It is special.
4. the intertexture mapping method of LDPC code word as claimed in claim 1, it is characterised in that LDPC code in the LDPC code table The code length of word is that 57600 bits, code check are 2/3.
5. the intertexture mapping method of LDPC code word as claimed in claim 1, it is characterised in that the number of the column major order is 10 row.
6. a kind of deinterleaving de-mapping method of LDPC code word, it is characterised in that comprise the following steps：
Soft de-mapped processing is carried out to obtain bit soft value data according to corresponding planisphere to symbol stream soft value data, wherein, The symbol stream soft value data are the intertexture mapping methods for the use LDPC code word as claimed in claim 1 that receiving terminal is received Obtained symbol stream；
The bit soft value data are sequentially written in memory space by row, and column major order is read out of described memory space, with Obtain for the first time than the bit soft value data after deinterleave；
The first time is divided into continuous multiple bit soft value numbers than the bit soft value data after deinterleave by predetermined length According to sub-block, and putting in order according to bit soft value data sub-block described in corresponding bit exchange pattern change, to form second The secondary bit soft value data than after deinterleave；
By described second than the bit of the check part corresponded in the bit soft value data after deinterleave in LDPC code word Soft value data carry out third time than deinterleave, to obtain third time than the bit soft value data after deinterleave；
It is softer than the bit after deinterleave with the third time than in the bit soft value data after deinterleave by described second Value Data is spliced into bit soft value data flow；And
LDPC decoding processing is carried out to the bit soft value data flow, to obtain decoded bitstream data.
7. the deinterleaving de-mapping method of LDPC code word as claimed in claim 6, it is characterised in that described by described second The bit soft value data of check part than corresponding in the bit soft value data after deinterleave in LDPC code word carry out the 3rd It is secondary than deinterleave, specifically included with obtaining the step of third time is than bit soft value data after deinterleave：
By described second than the bit of the check part corresponded in the bit soft value data after deinterleave in LDPC code word Soft value data are sequentially written in memory space by row, and column major order is read out of described memory space, it is described enter by row write and by It is 10 row to arrange the columns sequentially read, to obtain third time than the bit soft value data after deinterleave.
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