CN107786210A - For high code rate LDPC code word structure and coding method in multi-point cooperative communication system - Google Patents
For high code rate LDPC code word structure and coding method in multi-point cooperative communication system Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1148—Structural properties of the code parity-check or generator matrix
- H03M13/116—Quasi-cyclic LDPC [QC-LDPC] codes, i.e. the parity-check matrix being composed of permutation or circulant sub-matrices
- H03M13/1162—Array based LDPC codes, e.g. array codes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1148—Structural properties of the code parity-check or generator matrix
- H03M13/118—Parity check matrix structured for simplifying encoding, e.g. by having a triangular or an approximate triangular structure
- H03M13/1185—Parity check matrix structured for simplifying encoding, e.g. by having a triangular or an approximate triangular structure wherein the parity-check matrix comprises a part with a double-diagonal
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Abstract
It is used for high code rate LDPC code word structure and coding method in multi-point cooperative communication system the invention provides a kind of, the wherein minimum code word of code check is referred to as female code, it is the LDPC code word for the QC IRA structures that code length is N, information bit is K, encoded according to coding code table and coding method, obtain original code word.Other code words higher than female code code check are referred to as intercepting code word, it is the original code word interception acquisition after being encoded based on female code, partial bit is intercepted from original code word, and be stitched together and be transmitted, without transmission, the bit specifically intercepted is provided remaining bits by interception bit code table.Multi-point cooperative communication system requirements are while LDPC code word can carry out single coding and decoding, additionally it is possible to the code word of different code checks is united into carry out joint decoding, obtains performance gain.The codeword structure and coding method that the present invention provides can be very good to meet this requirement.
Description
Technical field
The present invention relates to communication code technical field, in particular it relates to a kind of communication system suitable for multi-point cooperative
High code rate LDPC code word structure and coding method.
Background technology
LDPC code word was proposed that he proposes code word and gives phase simultaneously by doctor Gallager first in 1963
The algorithm for the iterative decoding answered, but because iterative decoding algorithm originally is complex, integrated circuit technique at that time is sent out in addition
Postpone slowly, therefore LDPC code word is not receiving attention at that time.Within a period of time afterwards, except Tanner bipartite graph shapes
As change the iterative decoding for describing LDPC outside, almost no scholar has more concerns to LDPC code word.Then, in previous generation
Record the nineties, the Turbo code based on iterative decoding mechanism is found to be a kind of encoding scheme that can approach Shannon limits, extremely
This people just starts to notice iterative decoding possessed premium properties.Meanwhile based on the iteration of bipartite graph (Tanner figures)
Theory also achieves very big breakthrough：Error correction procedure is construed to the wrong process gradually decreased by Spielman, and demonstrates base
There is linear complexity in the encoding and decoding algorithm of bipartite graph, have scholar to propose again on this basis and scheme to give birth to using Expander
Into the condition and method of the bipartite graph with certain error correcting capability, Kschischang et al. establishes factor graph again afterwards
The theory of (Factor Graph), further deepened based on LDPC iterative decodings graph theory basis, these Research foundations it
On, Wiber then proposes the LDPC iterative decoding algorithms based on figure.All these theoretical propositions so that in nineteen ninety-five,
Mackay is found that LDPC code has the performance for approaching shannon limit as Turbo code with Neal, so as to trigger to LDPC code
The upsurge of research.
By the Depth Study to LDPC code word, everybody find LDPC code in every respect all than Turbo code advantageously, tool
Standby more preferable decoding performance and lower implementation complexity, it is suitable for system in future high speed data transfer and high performance wants
Ask, therefore receive extensive use.Had at present using the communication system of LDPC code word：European second generation digital broadcast television transmission mark
Quasi- DVB2 series；IEEE 802.11n WLAN standards；IEEE802.11e wireless wide area network standards；China Digital TV
Ground transmission standard (DTTB), and North America CCSDS near-earth, deep space communication system etc..
At present, LDPC theoretical foundation is really gradually perfect, and the research to this kind of code word is gradually shifted from pure theory
To the research of theoretical connected applications demand.For specific application scenarios and application demand it is necessary to design specific LDPC code word,
With meet demand.In multi-point cooperative communication system, have multiple base stations and coding transmission is carried out to identical content, ensure in complexity
The coverage rate of landform, if therefore receiving terminal all be able to should directly be translated when receiving the wherein signal of any one base station
Code.But when receiving terminal receives the signal that multiple base stations are sent, if the letter carried in these signals can not be made full use of
Breath carries out joint decoding, will result in a large amount of wastes of frequency spectrum, so what any base station of multi-point cooperative communication system requirements was sent
While LDPC code word can be decoded individually, the LDPC code couplet that different base station is sent can also be combined and be translated
Code, different base station is made full use of to send the information carried in signal, and the performance of joint decoding should compared to independent decoding performance
This is greatly improved.Application demand for more than is, it is necessary to which individually designed code word and its corresponding coding method meet.
The content of the invention
For in the prior art the defects of, it is an object of the invention to provide a kind of communication system suitable for multi-point cooperative
High code check (code check is more than or equal to 1/2) LDPC code word structure and coding method, for meeting needs in multi-point cooperative communication system
It is capable of the demand of joint decoding between different rate codewords.
According to the first aspect of the invention, there is provided high code rate LDPC code word a kind of communication system suitable for multi-point cooperative
Structure, including：
Female code：For lowest bit rate code word, it is the LDPC code word of QC-IRA structures, passes through the coding method root of QC-IRA structures
Coding, which is carried out, according to female code coding code table obtains original code word；
Intercept code word：Other rate codewords in addition to female code, intercepted and obtained by the original code word after being encoded to female code.
Further, described female code, for a length of K of information bit, a length of N of code word QC-IRA structure LDPC code words, it
Comprising a check matrix H, wherein N-K row represents to examine node, and N number of row represent variable node；
The check matrix H, by H1And H2Left and right two parts composition, H1On a left side, H2It is stitched together side by side on the right side, wherein：
H1There are N-K rows, K row, it is arranged by L rows, J, common L*J sub- matrix compositions, and is obtained after row-column transform, each
Submatrix is the Z*Z square formations of a Z rows Z row, and submatrix is null matrix or cyclic determinant, and cyclic determinant weight is
1；
H2There are N-K rows, N-K row, be a bidiagonal matrix.
In one embodiment, female code code check is 1/2, and code length 69120, submatrix size is 360*360, and it encodes code
Table is shown in annex I.Interception code code check be respectively 3/5A, 3/5B, 3/5C, 2/3A, 2/3B, 3/4A, 3/4B, 3/4C, 6/7A, 6/7B,
6/7C, 6/7D, 6/7E, 6/7F, while 3/5 rate codewords code length is that 57600,2/3 rate codewords code length is 51840,3/4 code check
Code word code length is that 46080,6/7 rate codewords code length is 40320, and corresponding interception code table is shown in annex II.
Further, the middle high code rate LDPC code word, can individually be decoded, moreover it is possible in multi-point cooperative communication system
Middle carry out joint decoding, and a set of code word includes multiple middle high code checks；In multi-point cooperative communication system, multiple base stations are had
Identical content is encoded, if receiving terminal can decode when receiving the wherein signal of any one base station, if receiving terminal
When receiving the signal that multiple base stations are sent, the information carried in these signals is made full use of to carry out joint decoding, joint decoding
Performance greatly improves compared to independent decoding performance.
According to the second aspect of the invention, there is provided high code rate LDPC code word a kind of communication system suitable for multi-point cooperative
Coding method, including：
Step 1: check bit is initialized；
Step 2: according to coding code table by information bit cycle accumulor to check bit, coding code table is by cyclic determinant
1 offset determines in position and cyclic determinant；
Step 3: check bit is added up, mother's LDPC code code word after being encoded.
Step 4: being intercepted according to interception code table to female code code word, final interception code word is obtained.
In aforementioned four step, female code code word can be obtained by completing step 3, and interception code word can be obtained by completing step 4.
Compared with prior art, heretofore described code word scheme, can better meet multi-point cooperative communication system
Following requirements：
1st, the LDPC code word that any base station is sent can be decoded individually；
2nd, the LDPC code couplet sent to different base station can be combined into row decoding, makes full use of different base station to send out
The information carried in the number of delivering letters, and the performance of joint decoding should greatly improve compared to independent decoding performance.
In multi-point cooperative communication system, have multiple base stations and coding transmission is carried out to identical content, ensure intricately
The transmission coverage rate of shape, if therefore receiving terminal when receiving the wherein signal of any one base station, this code word can be carried out directly
Decoding.When receiving terminal receives the signal that multiple base stations are sent, code word of the present invention can make full use of in these signals and carry
Information carry out joint decoding, make full use of frequency spectrum.
And it is individually designed that LDPC code word scheme common in the art, which is major part, therefore can not effectively join
Decoding is closed, when receiving terminal receives the signal that multiple base stations are sent, it is impossible to make full use of the information carried in these signals
Joint decoding is carried out, in turn results in a large amount of wastes of frequency spectrum
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the coding method schematic diagram that code is intercepted in one embodiment of the invention；
Fig. 2 is the structural representation of the check matrix H of LDPC code word in one embodiment of the invention.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
The invention provides a set of interception LDPC code word structure based on multi-point cooperative communication system, and corresponding coding
Code table and interception code table, and corresponding codeword structure and coding method are described in detail.
High code rate LDPC code word structure a kind of communication system suitable for multi-point cooperative, wherein lowest bit rate code word are mother
Code, it is the LDPC code word of QC-IRA (Quasi-Cyclic Irregular Repeat Accumulate) structure, passes through this knot
The coding method of structure encodes code table according to female code and carries out coding acquisition original code word.Other code words higher than female code code check are referred to as cutting
Code fetch word, it is that the original code word after being encoded based on female code intercepts acquisition, interception way from original code word as shown in figure 1, intercept
Partial bit (white portion in Fig. 1), and be stitched together and be transmitted, remaining bits (grey parts) are without transmission, tool
The bit of body interception is provided by interception bit code table.
One specific LDPC code word structure can fully be represented by its check matrix, in a set of interception LDPC code word
In, the final code word due to intercepting code is to intercept to obtain after being encoded by female code, thus while have multiple code checks, but only one
Individual specific code word, i.e., female code, interception code does not have specific code word, but its coding method illustrates how to obtain corresponding code
Word.
Female code structure is QC-IRA structures.In an a length of K of information bit, a length of N of code word QC-IRA structure LDPC code words
Check matrix H in, N-K row represents to examine node, and N number of row represent variable node, and this H-matrix is by H1And H2Left and right two
It is grouped into, as shown in Figure 2.Wherein, H1There are N-K rows, K row.It is made up of L*J submatrix P, and is obtained after row-column transform
.I.e.：
Submatrix Pl,jFor Z*Z square formation, submatrix is null matrix or cyclic determinant, and cyclic determinant
Weight is 1.L, j represent the position of submatrix, work as Pl,jFor non-zero matrix when, use Pl,j=i represents that i represents cyclic determinant
Offset, i.e.,：(assuming that Z=4)
H2There are N-K rows, N-K row, be a bidiagonal matrix.I.e.：
In a specific embodiment, female code code check is 1/2, and information bit length is 34560, code length 69120, circulation
Determinant size is 360*360.Therefore we use (i0, i1... i34559) representative information position, (p0, p1... p34559) represent school
Position is tested, and then obtains final code word (i0, i1... i34559, p0, p1... p34559)_.For female code of this specific embodiment,
Coding method is as follows：
Step 1: check bit is initialized.Even p0=p1=p2=...=p34559=0.
Step 2: according to the coding code table for the LDPC code word that annex I code checks are 1/2, code length is 69120, information bit is followed
Ring is added in check bit.According to coding code table, by the bit value i of first information bit0It is code table the first row to be added to address
The check bit of numeral, by ensuing 359 information bit bit values im, m=1,2,3 ... 359, which are added to address, is
(x+(mmod360)*96)mod34560
Check bit on, wherein x represents the numeral of code table the first row.Carried out by a loop blocks of 360 information bits
Circulation, each loop blocks carry out an aforesaid operations afterwards, but each loop blocks correspond to a line in code table, i.e., the 1st~
360
Information bit corresponds to code table the first row, and the 361st~720 information bit corresponds to the row of code table second, by that analogy.
Step 3: check bit is added up, the code word after being encoded.That is p0Remain unchanged, since i=1, successively
Carry out operations described below
Obtain final female code code word (i0, i1... i34559, p0, p1... p34559)。
In the present embodiment, because the code check of female code is 1/2, code length 69120, information bit length is 34560, intercepts code
It is to be obtained by being intercepted in female code, therefore decoded information bit length is identical, the interception code that corresponding code check is 3/5,2/3,3/4,6/7
Code length be respectively 57600,51840,46080,40320, each code rate information bit length of the above is identical, is 34560.
When being encoded for the interception code word in the present embodiment, except needing to complete above-mentioned steps one to three, it is also necessary to
Complete following step four.
Step 4: the interception code table in the annex II corresponding to annex I intercepts to female code code word, obtain final
Interception code word.I.e. according to the interception code table respectively intercepted in annex II in code check code table, female code code word (i is intercepted0, i1...
i34559, p0, p1... p34559) in corresponding bit, be stitched together, coding flow it is as shown in Figure 1.
Annex I：The coding code table for the LDCP code words that code check is 1/2, code length is 69120：
Annex II：Corresponding annex I each interception code check code table：
Assuming that the original code word after female code is encoded is (i0, i1... i34559, p0, p1... p34559)
When interception is 3/5A rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p2, p4, p5...,
p34558, p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3 ≠ 0.
When interception is 3/5B rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p2, p3, p5...,
p34557, p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3 ≠ 1.
When interception is 3/5C rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p1, p3, p4...,
p34557, p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3 ≠ 2.
When interception is 2/3A rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p3, p5, p7...,
p34557, p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod2 ≠ 0.
When interception is 2/3B rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p2, p4, p6...,
p34556, p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod2 ≠ 1.
When interception is 3/4A rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p3, p6, p9...,
p34554, p34557), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3=0.
When interception is 3/4B rate codewords, reservation bit code table is：(i0, i1... i34559, p1, 94, p7, p10...,
p34555, p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3=1.
When interception is 3/4C rate codewords, reservation bit code table is：(i0, i1... i34559, p2, p5, p8, p11...,
p34556, p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod3=2.
When interception is 6/7A rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p6, p12..., p34548,
p34554), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=0.
When interception is 6/7B rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p7, p13..., p34549,
p34555), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=1.
When interception is 6/7C rate codewords, reservation bit code table is：(i0, i1... i34559, p2, p8, p14..., p34550,
p34556), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=2.
When interception is 6/7D rate codewords, reservation bit code table is：(i0, i1... i34559, p3, p9, p15..., p34551,
p34557), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=3.
When interception is 6/7E rate codewords, reservation bit code table is：(i0, i1... i34559, p4, p10, p16..., p34552,
p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=4.
When interception is 6/7F rate codewords, reservation bit code table is：(i0, i1... i34559, p5, p11, p17..., p34553,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and m mod6=5.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (7)
1. a kind of be used for high code rate LDPC code word structure in multi-point cooperative communication system, it is characterised in that including：
Female code：It is the LDPC code word of QC-IRA structures, by the coding method of QC-IRA structures according to mother for lowest bit rate code word
Code coding code table carries out coding and obtains original code word；
Intercept code word：Other rate codewords in addition to female code, intercepted and obtained by the original code word after being encoded to female code.
2. according to claim 1 be used for high code rate LDPC code word structure in multi-point cooperative communication system, its feature exists
In：Described female code, for a length of K of information bit, a length of N of code word QC-IRA structure LDPC code words, it includes a verification square
Battle array H, wherein N-K row represent to examine node, N number of row expression variable node；
The check matrix H, by H1And H2Left and right two parts composition, H1On a left side, H2It is stitched together side by side on the right side, wherein：
H1There are N-K rows, K row, it is arranged by L rows, J, common L*J sub- matrix compositions, and is obtained after row-column transform, every sub- square
The Z*Z square formations that battle array arranges for a Z rows Z, i.e. N-K=L*Z, K=J*Z；Submatrix is null matrix or cyclic determinant, and is followed
Column of going in ring weight is 1；
H2There are N-K rows, N-K row, be a bidiagonal matrix.
3. according to claim 1 be used for high code rate LDPC code word structure in multi-point cooperative communication system, its feature exists
In the middle high code rate LDPC code word, individually being decoded, moreover it is possible in multi-point cooperative communication system combine translating
Code, and a set of code word includes multiple middle high code checks；In multi-point cooperative communication system, have multiple base stations and identical content is entered
Row coding, if receiving terminal can decode when receiving the wherein signal of any one base station, if receiving terminal receives multiple bases
Stand the signal sent when, the information that is carried in these signals can be made full use of to carry out joint decoding, joint decoding performance is compared to single
Only decoding performance greatly improves.
4. it is used for high code rate LDPC code word structure in multi-point cooperative communication system according to claim any one of 1-3,
Characterized in that, described female code, code word code check is 1/2, and code length 69120, submatrix size is 360*360, and it encodes code
Table is：
5. it is used for high code rate LDPC code word structure in multi-point cooperative communication system according to claim any one of 1-3,
Characterized in that, described interception code, code word code check is respectively that 3/5,2/3,3/4,6/7, while 3/5 rate codewords code length is
57600th, 2/3 rate codewords code length is that 51840,3/4 rate codewords code length is that 46080,6/7 rate codewords code length is 40320；Its
In 3/5 code check employ three kinds of interception ways, respectively 3/5A, 3/5B and 3/5C, 2/3 code check employs two kinds of interception patterns,
Respectively 2/3A and 2/3B, 3/4 code check employ three kinds of interception patterns, respectively 3/4A, 3/4B and 3/4C, and 6/7 code check uses
Six kinds of interception patterns, respectively 6/7A, 6/7B, 6/7C, 6/7D, 6/7E, 6/7F；It is corresponding interception code table be：
Assuming that the original code word after female code is encoded is (i0, i1... i34559, p0, p1... p34559)：
When interception is 3/5A rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p2, p4, p5..., p34558,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3 ≠ 0；
When interception is 3/5B rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p2, p3, p5..., p34557,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3 ≠ 1；
When interception is 3/5C rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p1, p3, p4..., p34557,
p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3 ≠ 2；
When interception is 2/3A rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p3, p5, p7..., p34557,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod2 ≠ 0；
When interception is 2/3B rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p2, p4, p6..., p34556,
p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod2 ≠ 1；
When interception is 3/4A rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p3, p6, p9..., p34554,
p34557), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3=0；
When interception is 3/4B rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p4, p7, p10..., p34555,
p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3=1；
When interception is 3/4C rate codewords, reservation bit code table is：(i0, i1... i34559, p2, p5, p8, p11..., p34556,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod3=2；
When interception is 6/7A rate codewords, reservation bit code table is：(i0, i1... i34559, p0, p6, p12..., p34548,
p34554), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=0；
When interception is 6/7B rate codewords, reservation bit code table is：(i0, i1... i34559, p1, p7, p13..., p34549,
p34555), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=1；
When interception is 6/7C rate codewords, reservation bit code table is：(i0, i1... i34559, p2, p8, p14..., p34550,
p34556), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=2；
When interception is 6/7D rate codewords, reservation bit code table is：(i0, i1... i34559, p3, p9, p15..., p34551,
p34557), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=3；
When interception is 6/7E rate codewords, reservation bit code table is：(i0, i1... i34559, p4, p10, p16..., p34552,
p34558), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=4；
When interception is 6/7F rate codewords, reservation bit code table is：(i0, i1... i34559, p5, p11, p17..., p34553,
p34559), wherein im, m=0,1,2 ... 34599；pm, m ∈ [0,34559] and mmod6=5.
6. it is used for high code check mother LDPC code code word in multi-point cooperative communication system described in a kind of any one of claim 1-5
Coding method, it is characterised in that：Including：
Step 1: check bit is initialized；
Step 2: position of the code table by cyclic determinant on information bit cycle accumulor to check bit, will be encoded according to coding code table
And 1 offset determines in cyclic determinant；
Step 3: check bit is added up, the high code check mother LDPC code code word after being encoded.
7. the coding of high code check LDPC interceptions code code word the communication system according to claim 6 suitable for multi-point cooperative
Method, it is characterised in that：Described interception code, its coding method are that the female code code word obtained after being encoded to female code is cut
Take, the specific bit that intercepts is provided by interception bit code table, i.e., after three steps described in claim 6 are completed, it is also necessary to
Carry out following steps four：
Step 4: being intercepted according to interception bit code table to female code code word, final interception code word is obtained.
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