CN104734807B - A kind of wireless broadcast communication system and method - Google Patents

A kind of wireless broadcast communication system and method Download PDF

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CN104734807B
CN104734807B CN201510080319.4A CN201510080319A CN104734807B CN 104734807 B CN104734807 B CN 104734807B CN 201510080319 A CN201510080319 A CN 201510080319A CN 104734807 B CN104734807 B CN 104734807B
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CN104734807A (en
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王芳
徐扬
寇亚军
张娟
李明齐
缪军
封松林
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Shanghai Advanced Research Institute of CAS
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Abstract

The present invention provides a kind of wireless broadcast communication system and method, there is provided communicate the service logical channels used；Wherein, the Error Correction of Coding form that the service logical channels are cascaded using outer coding and interior coding, the outer coding include BCH code, and the interior coding includes LDPC code；The Error Correction of Coding includes：Data to be transmitted generates a FEC encoding block after FEC coded treatments, wherein, the FEC coded treatments include：The check bit of BCH code is attached to after data to be transmitted, and the check bit of LDPC code is attached to after BCH code check bit, wherein, the LDPC code uses QC structures；The LDPC uses the first QC coding structures in low bit- rate, and the 2nd QC coding structures are used in high code check；The present invention improves wireless broadcast communication system of future generation（Comprising being not limited in NGB W systems）Performance, it is more approached shannon limit.

Description

A kind of wireless broadcast communication system and method
Technical field
It is logical more particularly to radio and television of future generation wireless (NGB-W) the present invention relates to wireless broadcast communication technical field Error correction coding in letter system.
Background technology
With the fast development of World Economics culture, demand rapid growth of the user to wireless information services.Individually according to By conventional wireless radio network or conventional wireless bi-directional communication network, the optimization transmission of information service can not be realized.At the same time, People are no longer satisfied with only watching traditional radiated television business, but have more to novel radio broadcast television service Carry out stronger demand.(NGB-W) system that Next generation broadcasting network is wireless, achievable radio broadcasting and wireless two-way communication Amalgamation and coexistence, be solve mobile message business datum amount rapid growth and wireless network transmissions capacity it is limited between contradiction it is effective Approach, and wired, wireless fusion innovative service the necessary ways of support.
In wireless environment complicated and changeable, the transmission of NGB-W system business faces serious interference and noise problem.Error correction Coding techniques is one of the reliability for ensureing information transfer, the most effective technology for overcoming noise and interference.LDPC code due to its compared with Error floor, the relatively low decoding complexity of depth, are adopted by numerous communication standards.
In traditional communication system, such as DVB-T2 (transmission of second generation Digital European ground TV broadcast), using S- The LDPC code of IRA structures, this LDPC code encoder complexity are low, it is only necessary to linear complexity can be achieved according to check matrix Coding.But the LDPC code employed in DVB-T2 systems, following two problems be present：First, the code word of low bit- rate (code check ＜ 1/2) Farther out, performance is up for further lifting for performance distance shannon limit；2nd, some codeword error flat beds are higher than BER=1E-7.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of wireless broadcast communication system and Method, solve the problems, such as that the transmission of NGB-W system business faces serious interference and noise in the prior art.
To realize above-mentioned target and other related objectives, the present invention provides a kind of wireless broadcast communication system, including：Send The service logical channels of device, reception device and both communications；Wherein, the service logical channels use outer coding and interior coding The Error Correction of Coding form of cascade, the outer coding include BCH code, and the interior coding includes LDPC code；The Error Correction of Coding includes： Data to be transmitted generates FEC encoding blocks after FEC coded treatments, wherein, the FEC coded treatments include：The verification of BCH code Bit is attached to after data to be transmitted, and the check bit of LDPC code is attached to after BCH code check bit；Wherein, it is described LDPC uses the first QC coding structures in low bit- rate, and the 2nd QC coding structures are used in high code check.
Optionally, the BCH code is using the basis BCH systematic codes being defined on GF (2^14) domain.
Optionally, the interior coding uses LDPC code of the length for 19200 bits, and sub-block size is 320, its code check bag Include：1/5th, 1/4,1/3,5/12,1/2,7/12,2/3,3/4 and 4/5, wherein, it is the low bit- rate less than 1/2, is more than or equal to 1/2 is the high code check.
Optionally, the LDPC check matrix H is that a dimension being defined on GF (2) domain is MLDPC×NLDPCPoint Block matrix：
Wherein, MLDPC=NLDPC-KLDPC,Each sub-block HI, jIt is one Dimension is Z × Z circular matrix, wherein, Z=320,
HI, jRow k by HI, jThe 0th k element of row ring shift right obtain, 1≤k≤Z-1；Verification Matrix H is uniquely determined by all elements of its aZ row,
In HI, jIn the first row, if only tI, jIndividual element is 1, and remaining element is 0, i.e. HI, jTieed up by a Z × Z Unit matrix ring shift right tI, jIndividual element is got, then HI, jIt can be expressed asWherein：
If tI, j=0, then HI, jIt is the unit matrix of Z × Z dimension.
Optionally, the 2nd QC coding structures include：A part of circular matrix H of the check matrix HI, jWith double Loop structure, it is set toWherein,WithIt is two circular matrixes being not mutually equal, it is described
Optionally, the first QC coding structures include：Check matrix H is divided into 5 matrix part A, B, C, D and E, described Check matrix is divided into two rows, and upper row is followed successively by A, B and E from left to right, and lower row is followed successively by C and D from left to right；Wherein, B and D be respectively p × p and
(NLDPC-KLDPC-p)×(NLDPC-KLDPC- p) square formation, E is p × (NLDPC-KLDPC- p) zero gust, A is p × KLDPC High-density matrix, C is (NLDPC-KLDPC-p)×(KLDPC+ p) low density matrix.
Optionally, tieed up by Z × Z 0 gust or circular matrix H of the A and CI, jForm, the circular matrix in B meets following Condition：Circular matrix in D meets following condition：
Optionally, the FEC codings include：
For KBCHThe data to be transmitted of bit forms the information bit of BCH code
Wherein, m0For data to be transmitted highest significant position
(MSB),For least significant bit (LSB)；
BCH code coding, the BCH check bits that will be obtained are carried out to m
It is attached to after m, obtains the information bit of LDPC code：
It is K to lengthLDPCΛ carry out LDPC code coding, and the LDPC code check bit that will be obtained：
It is attached to after A, it is N to obtain lengthLDPCLDPC code system
Code word：
Optionally, the wireless broadcast communication system includes：Radio and television Radio Network System of future generation.
To realize above-mentioned target and other related objectives, the present invention provides a kind of wireless broadcast communication method, including：There is provided Communicate the service logical channels used；Wherein, the Error Correction of Coding that the service logical channels are cascaded using outer coding and interior coding Form, the outer coding include BCH code, and the interior coding includes LDPC code；The Error Correction of Coding includes：Data to be transmitted passes through After FEC coded treatments, a FEC encoding block is generated, wherein, the FEC coded treatments include：The check bit of BCH code adds After data to be transmitted, the check bit of LDPC code is attached to after BCH code check bit, wherein, the LDPC code uses QC structures；The LDPC uses the first QC coding structures in low bit- rate, and the 2nd QC coding structures are used in high code check.
As described above, the present invention provides a kind of wireless broadcast communication system and method, there is provided communicate the service logic used Channel；Wherein, the Error Correction of Coding form that the service logical channels are cascaded using outer coding and interior coding, the outer coding include BCH code, the interior coding include LDPC code；The Error Correction of Coding includes：Data to be transmitted is after FEC coded treatments, generation one Individual FEC encoding blocks, wherein, the FEC coded treatments include：The check bit of BCH code is attached to after data to be transmitted, LDPC The check bit of code is attached to after BCH code check bit, wherein, the LDPC code uses QC structures；The LDPC is in low code Rate uses the first QC coding structures, and the 2nd QC coding structures are used in high code check；The present invention improves wireless broadcast communication of future generation The performance of system (comprising NGB-W systems are not limited in), makes it more approach shannon limit.
Brief description of the drawings
Fig. 1 is shown as the schematic diagram of error correcting coding process principle in one embodiment of the invention.
Fig. 2 is shown as the improvement QC structural representations of interior coding LPDC in one embodiment of the invention.
Fig. 3 a are shown as FER/BER simulation result of the scheme of one embodiment of the invention under awgn channel, QPSK modulation Figure.
Fig. 3 b are shown as FER/ of the scheme of one embodiment of the invention under i.i.d Rayleigh channels, QPSK modulation BER simulation result figures.
Fig. 4 a are shown as the scheme of one embodiment of the invention under awgn channel, the QPSK modulation and existing DVB-T2 systems The simulation result figure of performance comparison.
The scheme that Fig. 4 b are shown as one embodiment of the invention is under i.i.d Rayleigh channels, QPSK modulation and existing The simulation result figure of the performance comparison of DVB-T2 systems.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the case where not conflicting, the embodiment in the application And the feature in embodiment can be mutually combined.
The present invention provides a kind of wireless broadcast communication system, including：The business of dispensing device, reception device and both communications Logic channel, the wireless broadcast communication system include but is not limited to Next generation broadcasting network network (NGB-W) system, preferably It is to be applied to mobile context；Wherein, the dispensing device, reception device are, for example, mobile terminal device, gateway device or base station Deng.
Wherein, Error Correction of Coding (FEC) form that the service logical channels are cascaded using outer coding and interior coding, in this reality Apply in example, the outer coding is BCH code, and the interior coding is LDPC code, but not so limited, in other communication systems It can be changed according to demand.
As shown in figure 1, the Error Correction of Coding includes：Length is KBCHThe data to be transmitted of bit after FEC coded treatments, Generate a NLDPCThe encoding block (FEC Block) of bit.The check bit of BCH code is attached to after data to be transmitted, LDPC code Check bit is attached to after BCH code check bit；The LDPC code is using QC (Quasi-Cyclic, the quasi- circulation of piecemeal) knot Structure, low bit- rate employ improved QC structures, and compared to the LDPC code of traditional QC structures, its decoding threshold is closer to shannon limit.
In one embodiment, the FEC coding process is for example as shown below：
Length is KBCHThe data to be transmitted of bit forms the information bit of BCH code
Wherein m0For data to be transmitted highest significant position (MSB),
For least significant bit (LSB)
BCH code coding, the BCH check bits that will be obtained are carried out to mIt is attached
It is added in after m, obtains the information bit of LDPC code
It is K to lengthLDPCΛ carry out LDPC code coding, and the LDPC code check bit that will be obtained
It is attached to after Λ, it is N to obtain lengthLDPCLDPC code system
System code word
In one embodiment, the outer coding is using the sheet for being defined on 12 bit-errors of most multipotency correction on domain GF (2^14) Former BCH systematic codes, its generator polynomial hexadecimal are for example expressed as：
120BBA549566BA23004BF345D7ADC79EAE3330C560D。
In one embodiment, the interior coding uses LDPC code of the length for 19200 bits, and sub-block size Z is 320, its Code check is respectively 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4 and 4/5, wherein, definable is the low code less than 1/2 Rate, it is the high code check more than or equal to 1/2.
For example, NGB-W systems mobile context Error Correction of Coding basic parameter sets and is shown in Table 1, wherein NLDPCRepresent LDPC Code code length,LDPCRepresent LDPC code systematic bits length, NBCHRepresent BCH code code length, KBCHRepresent BCH code systematic bits length, Z Represent piecemeal size.
Table 1：NGB-W system mobile context LDPC code parameters
LDPC code rate KBCH NBCH BCH error correcting capabilities NBCH-KBCH KLDPC NLDPC Z
1/5 3672 3840 12 168 3840 19200 320
1/4 4632 4800 12 168 4800 19200 320
1/3 6232 6400 12 168 6400 19200 320
5/12 7832 8000 12 168 8000 19200 320
1/2 9432 9600 12 168 9600 19200 320
7/12 11032 11200 12 168 11200 19200 320
2/3 12632 12800 12 168 12800 19200 320
3/4 14232 14400 12 168 14400 19200 320
4/5 15192 15360 12 168 15360 19200 320
With reference to above-mentioned, the check matrix of the LDPC code of 9 kinds of code checks can be provided；The check matrix H of the LDPC code can be with It is that a dimension being defined on GF (2) domain is MLDPC×NLDPCMatrix in block form：
Wherein, MLDPC=NLDPC-KLDPC,Each sub-block HI, jIt is one Dimension is Z × Z circular matrix, wherein,
HI, jRow k by HI, jThe 0th k element of row ring shift right obtain, 1≤k≤Z-1；
Check matrix H is uniquely determined by all elements of its aZ row,
In HI, jIn the first row, if only tI, jIndividual element is 1, and remaining element is 0, i.e. HI, jTieed up by a Z × Z Unit matrix ring shift right tI, jIndividual element is got, then HI, jIt can be expressed asWherein：
If tI, j=0, then HI, jIt is the unit matrix of Z × Z dimension.
Preferably, the 2nd QC coding structures include：A part of circular matrix H of the check matrix HI, jWith double Loop structure, it is set toWherein,WithIt is two circular matrixes being not mutually equal, it is described
The degree distribution of high code check (R >=1/2) LDPC code is as shown in table 2：
Table 2：The degree distribution of the high code rate LDPC code of NGB-W system mobile contexts
Code check ρ(x) λ(x)
1/2 0.4562x24+0.1460x3+0.2080x2+0.1898x1 0.1460x9+0.854x8
7/12 0.4839x11+0.3387x2+0.1774x1 0.9274x9+0.0726x8
2/3 0.4348x19+0.1594x3+0.2826x2+0.1232x1 0.8116x13+0.1884x12
3/4 0.4891x14+0.0290x3+0.3804x2+0.1014x1 0.4130x18+0.5870x17
4/5 0.4478x14+0.0448x3+0.4254x2+0.0821x1 0.3431x22+0.6567x21
As shown in Fig. 2 in one embodiment, the first QC coding structures include：Check matrix H is divided into 5 matrix portions Point A, B, C, D and E, the check matrix are divided into two rows, and upper row is followed successively by A, B and E from left to right, lower row from left to right according to Secondary is C and D, wherein, B and D are respectively p × p and (NLDPC-KLDPC-p)×(NLDPC-KLDPC- p) square formation, E is p × (NLDPC- KLDPC- p) zero gust, A is p × KLDPCHigh-density matrix, C is (NLDPC-KLDPC-p)×(KLDPC+ p) low density matrix.
In one embodiment, tieed up by Z × Z 0 gust or circular matrix H of the A and CI, jForm, the circular matrix in B is expired It is enough lower condition：Circular matrix in D meets following condition：
The degree distribution of low bit- rate (R ＜ 1/2) LDPC code is as shown in table 3：
Table 3：The degree distribution of NGB-W system mobile context low code rate LDPC codes
Code check ρ(x) λ(x)
1/5 0.0543x11+0.7466x10+0.1991 0.0543x11+0.1493x10+0.7964x3
1/4 0.056x13+0.052x12+0.72x11+0.172 0.1x24+0.092x23+0.6x4+0.208x3
1/3 0.0528x13+0.0491x12+0.7547x9+0.1434 0.025x31+0.025x30+0.3x5+0.65x4
5/12 0.1087x9+0.7174x8+0.0290x7+0.0254x6+0.1196 0.1449x39+0.1379x37+0.7174x5
With reference to above-mentioned, the present invention also provides a kind of wireless broadcast communication method, its technical principle with above-described embodiment substantially It is identical, therefore the technical characteristic in above-described embodiment in the case of not conflicting can be applied in methods described embodiment, because This is no longer repeated identical technical characteristic.
The present invention provides a kind of wireless broadcast communication method, including：The service logical channels that communication uses are provided；Wherein, The Error Correction of Coding form that the service logical channels are cascaded using outer coding and interior coding, the outer coding includes BCH code, described Interior coding includes LDPC code；The Error Correction of Coding includes：Data to be transmitted generates a FEC coding after FEC coded treatments Block, wherein, the FEC coded treatments include：The check bit of BCH code is attached to after data to be transmitted, the verification of LDPC code Bit is attached to after BCH code check bit, wherein, the LDPC code uses QC structures；The LDPC is in low bit- rate using the One QC coding structures, the 2nd QC coding structures are used in high code check.
In the NGB-W systems of above-described embodiment, the LDPC code scheme that a set of code length is 19200 is devised, is emulated Experiment, the decoding threshold under awgn channel, QPSK modulation is as shown in table 4 below, i.i.d Rayleigh channels and QPSK modulation Under FER (Frame Error Rate, FER)/BER (Bit Error Rate, the bit error rate) curve respectively such as Fig. 3 a and 3b It is shown；And under awgn channel and i.i.d Rayleigh channels, QPSK modulation, scheme and the DVB-T2 systems of the embodiment of the present invention Respectively as shown in figures 4 a and 4b, the transverse axis in Fig. 3 a to Fig. 4 b is symbol signal to noise ratio Es/ to the LDPC code BER of system performance comparison N0, unit dB；The embodiment scheme has following excellent results：
In awgn channel, QPSK modulation, BER=10-7Under, the working range of the scheme of the embodiment of the present invention is -3.65dB ~4.68dB (SNR), cover depth covering scene and high speed data transfers scene under deep fading；In the program, phase The decoding threshold interval of adjacent code is about 1dB (SNR), network design is had great flexibility；The code of all 9 kinds of code checks has There is the decoding threshold for approaching shannon limit；Compared with the LDPC code of DVB-T2 systems, the LDPC code of the program has wider array of work Scope (1/5 yard of DVB-T2 only uses in the signaling channel), operating point distribution evenly, bigger waterfall area slope, more Low decoding threshold (same code rate is maximum to reduce 0.446dB).
Table 4：NGB-W system mobile context LDPC codes decoding threshold (Eb/N0@BER=1E-7) (dB)
Described in brought forward, following table is referred to A.11-A.19, LDPC check matrix under 9 code checks in displaying the present embodiment Particular content：
The code rate LDPC code check matrix of Table A .11: 1/5, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .12: 1/4, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .13: 1/3, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .14: 5/12, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .15: 1/2, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .16: 7/12, NLDPC=19200, Z=320
Table A .17：2/3 code rate LDPC code check matrix, NLDPC=19200, Z=320
Table A .18：3/4 code rate LDPC code check matrix, NLDPC=19200, Z=320
The code rate LDPC code check matrix of Table A .19: 4/5, NLDPC=19200, Z=320
In summary, the present invention provides a kind of wireless broadcast communication system and method, there is provided communicate the service logic used Channel；Wherein, the Error Correction of Coding form that the service logical channels are cascaded using outer coding and interior coding, the outer coding include BCH code, the interior coding include LDPC code；The Error Correction of Coding includes：Data to be transmitted is after FEC coded treatments, generation one Individual FEC encoding blocks, wherein, the FEC coded treatments include：The check bit of BCH code is attached to after data to be transmitted, LDPC The check bit of code is attached to after BCH code check bit, wherein, the LDPC code uses QC structures；The LDPC is in low code Rate uses the first QC coding structures, and the 2nd QC coding structures are used in high code check；The present invention improves wireless broadcast communication of future generation The performance of system (comprising NGB-W systems are not limited in), makes it more approach shannon limit.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as Into all equivalent modifications or change, should by the present invention claim be covered.

Claims (9)

  1. A kind of 1. wireless broadcast communication system, it is characterised in that including：
    The service logical channels of dispensing device, reception device and both communications；
    Wherein, the Error Correction of Coding form that the service logical channels are cascaded using outer coding and interior coding, the outer coding include BCH code, the interior coding include LDPC code；The check matrix H of the LDPC code is that a dimension being defined on GF (2) domain is MLDPC×NLDPCMatrix in block form：
    Wherein, MLDPC=NLDPC-KLDPC,Each sub-block HI, jIt is a dimension For Z × Z circular matrix, wherein, Z=320,HI, jRow k by HI, j 0 k element of row ring shift right obtains, 1≤k≤Z-1；Check matrix H is uniquely determined by all elements of its aZ row,
    In HI, jIn the first row, if only tI, jIndividual element is 1, and remaining element is 0, i.e. HI, jBy the list of Z × Z dimension Position battle array ring shift right tI, jIndividual element is got, then HI, jIt can be expressed asWherein：
    If tI, j=0, then HI, jIt is the unit matrix of Z × Z dimension；
    The Error Correction of Coding includes：Data to be transmitted generates FEC encoding blocks after FEC coded treatments, wherein, the FEC codings Processing includes：The check bit of BCH code is attached to after data to be transmitted, and the check bit of LDPC code is attached to BCH code verification After bit；
    Wherein, the LDPC uses the first QC coding structures in low bit- rate, and the 2nd QC coding structures are used in high code check.
  2. 2. wireless broadcast communication system according to claim 1, it is characterised in that the BCH code uses and is defined on GF (2^ 14) the basis BCH systematic codes on domain.
  3. 3. wireless broadcast communication system according to claim 1, it is characterised in that the interior coding use length for The LDPC code of 19200 bits, sub-block size are 320, and its code check includes：1/5、1/4、1/3、5/12、1/2、7/12、2/3、3/4 With 4/5, wherein, it is the low bit- rate less than 1/2, is the high code check more than or equal to 1/2.
  4. 4. wireless broadcast communication system according to claim 1, it is characterised in that the 2nd QC coding structures include： A part of circular matrix H of check matrix HI, jWith double circulation structure, it is set toWherein,WithIt is two mutual Unequal circular matrix, it is described
  5. 5. wireless broadcast communication system according to claim 1, it is characterised in that the first QC coding structures include： Check matrix H is divided into 5 matrix parts A, B, C, D and E, and the check matrix is divided into two rows, and upper row is from left to right successively For A, B and E, lower row is followed successively by C and D from left to right, wherein, B and D are respectively p × p and (NLDPC-KLDPC-p)×(NLDPC- KLDPC- p) square formation, E is p × (NLDPC-KLDPC- p) zero gust, A is p × KLDPCHigh-density matrix, C is (NLDPC-KLDPC-p) ×(KLDPC+ p) low density matrix.
  6. 6. wireless broadcast communication system according to claim 5, it is characterised in that tieed up by Z × Z 0 gust of the A and C Or circular matrix HI, jForm, the circular matrix in B meets following condition：Following in D Ring matrix meets following condition：
  7. 7. wireless broadcast communication system according to claim 1, it is characterised in that the FEC codings include：
    KBCHThe data to be transmitted of bit forms the information bit of BCH codeWherein, m0To be to be transmitted Data highest significant position (MSB),For least significant bit (LSB)；
    BCH code coding, the BCH check bits that will be obtained are carried out to mIt is attached to after m, obtains The information bit of LDPC code：
    It is K to lengthLDPCΛ carry out LDPC code coding, and the LDPC code check bit that will be obtained：It is attached to after Λ, it is N to obtain lengthLDPCLDPC code systematic codeword：
  8. 8. wireless broadcast communication system according to claim 1, it is characterised in that the wireless broadcast communication system bag Include：Radio and television Radio Network System of future generation.
  9. A kind of 9. wireless broadcast communication method, it is characterised in that including：
    The service logical channels that communication uses are provided；Wherein, the service logical channels are cascaded using outer coding and interior coding Error Correction of Coding form, the outer coding include BCH code, and the interior coding includes LDPC code；The Error Correction of Coding includes：It is to be transmitted Data generate a FEC encoding block after FEC coded treatments, wherein, the FEC coded treatments include：The verification ratio of BCH code Spy is attached to after data to be transmitted, and the check bit of LDPC code is attached to after BCH code check bit, wherein, the LDPC Code uses QC structures；The LDPC uses the first QC coding structures in low bit- rate, and the 2nd QC coding structures are used in high code check；
    The check matrix H of the LDPC code is that a dimension being defined on GF (2) domain is MLDPC×NLDPCMatrix in block form：
    Wherein, MLDPC=NLDPC-KLDPC,Each sub-block HI, jIt is a dimension For Z × Z circular matrix, wherein, Z=320,HI, jRow k by HI, j 0 k element of row ring shift right obtains, 1≤k≤Z-1；Check matrix H is uniquely determined by all elements of its aZ row,
    In HI, jIn the first row, if only tI, jIndividual element is 1, and remaining element is 0, i.e. HI, jBy the list of Z × Z dimension Position battle array ring shift right tI, jIndividual element is got, then HI, jIt can be expressed asWherein：
    If tI, j=0, then HI, jIt is the unit matrix of Z × Z dimension.
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