CN105376019A - Interleaving and mapping method and de-interleaving and de-mapping method of LDPC code word - Google Patents

Abstract

The invention provides an interleaving and mapping method and a de-interleaving and de-mapping method of LDPC code word. The method includes: performing the first bit interleaving of a verification portion in the LDPC code word and obtaining a verification bit stream; splicing an information bit portion in the LDPC code word and the verification bit stream to form the LDPC code word after the first bit interleaving; dividing the LDPC code word after the first bit interleaving into a plurality of continuous bit sub-blocks according to a predetermined length, transforming the arranging sequence of the bit sub-blocks according to a corresponding bit transformation pattern, and forming the LDPC code word after the second bit interleaving; writing in the LDPC code word after the second bit interleaving according to the column sequence and reading out and obtaining the LDPC code word after the third bit interleaving according to the row sequence; and performing constellation mapping of the LDPC code word after the third bit interleaving according to a constellation diagram in order to obtain a symbol stream. The interleaving mapping and de-interleaving and de-mapping methods are selected according to different LDPC code lists, and the system performance can be better enhanced.

Description

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

Technical field

The present invention relates to digital television techniques field, particularly a kind of intertexture of LDPC code word and mapping method and deinterleaving de-mapping method.

Background technology

In existing broadcast communication standard, LDPC coding, Bit Interleave and constellation mapping are code modulation modes the most common.In different emission systems, LDPC coding, Bit Interleave and constellation mapping all need independent design, and combined debugging, to obtain best channel performance.Therefore, how forming Bit Interleave targetedly for specific LDPC code word and constellation mapping mode, is a technical barrier of this area.

Summary of the invention

The problem that the present invention solves cannot form Bit Interleave targetedly for specific LDPC code word and constellation mapping mode in prior art.

For solving the problem, embodiments providing a kind of intertexture and mapping method of LDPC code word, comprising the steps: the check part in described LDPC code word to carry out first time Bit Interleave to obtain check bit stream; Information bit part in described LDPC code word and described check bit stream are spliced into the LDPC code word after first time Bit Interleave; LDPC code word after described first time Bit Interleave is divided into the multiple sub-blocks of bits of continuous print by predetermined length, and puts in order the LDPC code word after forming second time Bit Interleave according to sub-blocks of bits described in corresponding bit exchange pattern change; LDPC code word column major order write memory space after described second time Bit Interleave is also sequentially read the LDPC code word after obtaining third time Bit Interleave by row in this memory space; Constellation mapping is carried out to obtain symbol stream according to corresponding planisphere to the LDPC code word after described third time Bit Interleave.

The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word, comprises the steps: to carry out soft demapping process to obtain bit soft value data to symbol stream soft value data according to corresponding planisphere; Wherein said symbol stream soft value data are the symbol stream that interlace map method that receiving terminal receives LDPC code word described above obtains; Described bit soft value data are sequentially written in memory space by row and column major order reads to obtain first time than the bit soft value data after deinterleave in this memory space; Described first time is divided into the multiple bit soft value data sub-block of continuous print than the bit soft value data after deinterleave by predetermined length, and according to bit soft value data sub-block described in corresponding bit exchange pattern change put in order form second time than the bit soft value data after deinterleave; Described second time is carried out third time than deinterleave to obtain third time than the bit soft value data after deinterleave than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave; Described second time is spliced into bit soft value data flow with described third time than the bit soft value data after deinterleave than in the bit soft value data after deinterleave; LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.

Compared with prior art, technical solution of the present invention has the following advantages:

Corresponding interlace map and deinterleaving de-mapping method is selected better to be promoted to make systematic function for specific LDPC code table.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the embodiment of the interlace map method of a kind of LDPC code word of the present invention;

Fig. 2 is the schematic flow sheet of the embodiment of the deinterleaving de-mapping method of a kind of LDPC code word of the present invention;

Fig. 3 be in the interlace map method of a kind of LDPC code word of the present invention to the check part in LDPC code word carry out first time Bit Interleave to obtain the schematic diagram of check bit stream;

Fig. 4 is the schematic diagram put in order according to sub-blocks of bits described in bit exchange pattern change in the interlace map method of a kind of LDPC code word of the present invention.

Embodiment

Inventor finds in prior art, cannot form Bit Interleave targetedly for specific LDPC code word and constellation mapping mode.

For the problems referred to above, inventor is through research, provide a kind of interlace map method and deinterleaving de-mapping method of LDPC code word, select corresponding interlace map and deinterleaving de-mapping method better to be promoted to make systematic function for different LDPC code tables.

For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.

In embodiments of the present invention, transmitter terminal is: first the bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code is input to the coding that LDPC encoder carries out the LDPC code word of specific code check code length, input bit interleaver afterwards, interleaving treatment is carried out according to certain specific Bit Interleave patterning method, subsequently the data after Bit Interleave process are carried out the 256QAM constellation mapping of corresponding code check, modulate afterwards, launch, experience channel.Receiver end is: the data after channel are carried out demodulation, and the data input De-mapping module then after demodulation, carries out 256QAM demapping.Afterwards the bit soft value information that De-mapping module exports is input to de-interleaving block and carries out deinterleaving, output to ldpc decoder afterwards, the decoding based on specific LDPC code word is carried out to it, output bit flow of finally decoding.

As shown in Figure 1 be the schematic flow sheet of the embodiment of the interlace map method of a kind of LDPC code word of the present invention.With reference to figure 1, the interlace map method of LDPC code word comprises the steps:

Step S11: the check part in described LDPC code word is carried out first time Bit Interleave to obtain check bit stream;

Step S12: the information bit part in described LDPC code word and described check bit stream are spliced into the LDPC code word after first time Bit Interleave;

Step S13: the LDPC code word after described first time Bit Interleave is divided into the multiple sub-blocks of bits of continuous print by predetermined length, and put in order the LDPC code word after forming second time Bit Interleave according to sub-blocks of bits described in corresponding bit exchange pattern change;

Step S14: the LDPC code word column major order write memory space after described second time Bit Interleave is also sequentially read the LDPC code word after obtaining third time Bit Interleave by row in this memory space;

Step S15: constellation mapping is carried out to obtain symbol stream according to corresponding planisphere to the LDPC code word after described third time Bit Interleave.

In the present embodiment, described step S11 specifically comprises the steps: the check part column major order write memory space in described LDPC code word and sequentially reads to obtain check bit stream in this memory space by row.

Particularly, the check portion generating LDPC code word is divided and carries out Bit Interleave: check part M the bit altogether of LDPC code word, write in a memory space by row, often arrange Q bit, altogether L row, that is M=Q*L, then sequentially reads by row.Its specific implementation process is with reference to shown in figure 3.

In described step S13, the LDPC code word after described first time Bit Interleave is divided into the multiple sub-blocks of bits of continuous print by predetermined length, and wherein said predetermined length is 320.Further, according to sub-blocks of bits described in corresponding bit exchange pattern change put in order formed second time Bit Interleave after LDPC code word.Its detailed process is detailed as shown in Figure 4, in the diagram, and (m ₀, m ₁..., m _n/320-1) be the bit exchange pattern of 320 length bits sub-blocks.

Particularly, the code length of the LDPC code word in LDPC code table is 57600, and corresponding bit exchange pattern is: 38,826,564,211,648,810,965,681,711,451,251,505,914,071,731,193,426,281,769 61,102,235,451,241,659,127,630,137,785,179,154,163,331,166,711,260,171,274 01,351,041,034,920,136,102,471,001,774,416,106,155,321,695,352,431,079,217 50,574,666,141,251,111,171,461,209,515,815,513,012,193,863,115,914,424,197 29,481,877,314,581,281,129,915,468,156,138,126,621,422,741,142,168,971,701 31,749,810,812,912,277,181,341,663,715,211,837,099,891,539,011,316,110,514 31,518,061,167,139,179,147,523,101,132,633,948,691,510,421,151,495,013,317 27585368441178711231317483160157162148

It should be noted that, in the present embodiment, each numerical value in described bit exchange pattern refers to the position without sub-blocks of bits described before bit exchange.Such as, second numerical value 82 implication in above-mentioned bit exchange pattern refers to and original after bit exchange, nowadays becomes second sub-blocks of bits without the 83rd sub-blocks of bits before bit exchange.

Corresponding planisphere is:

Constellation point	Complex symbol
		0	0.2975-1.0564i
1	0.5862-0.9617i
		2	0.2909-1.0696i
3	0.5796-0.9689i
		4	0.2953-1.3357i
5	0.7488-1.2365i
		6	0.3004-1.5114i
7	0.8151-1.3816i
		8	0.3004-1.0535i
9	0.5847-0.9631i
		10	0.2931-1.0659i
11	0.5825-0.9668i
		12	0.2953-1.3189i

[0029]

13	0.7466-1.2168i
		14	0.296-1.4654i
15	0.8297-1.3539i
		16	1.0637-0.296i
17	0.9617-0.5811i
		18	1.0732-0.2931i
19	0.9682-0.5818i
		20	1.3619-0.2997i
21	1.2249-0.7546i
		22	1.5427-0.3106i
23	1.3969-0.8523i
		24	1.0615-0.2945i
25	0.9631-0.5818i
		26	1.071-0.2924i
27	0.9675-0.5825i
		28	1.3255-0.2975i
29	1.1979-0.7495i
		30	1.456-0.304i
31	1.3269-0.8414i
		32	0.24362-0.561i
33	0.29056-0.53737i
		34	0.23727-0.54513i

[0030]

35	0.27988-0.52313i
		36	0.2031-0.39313i
37	0.21726-0.38062i
		38	0.19462-0.37779i
39	0.21101-0.36432i
		40	0.24359-0.5624i
41	0.29204-0.53809i
		42	0.23998-0.54613i
43	0.28388-0.52394i
		44	0.20369-0.39469i
45	0.21684-0.38305i
		46	0.19545-0.37848i
47	0.20796-0.36912i
		48	0.55815-0.25428i
49	0.53507-0.30144i
		50	0.54037-0.25191i
51	0.51787-0.2939i
		52	0.39171-0.20314i
53	0.38133-0.21724i
		54	0.376-0.196i
55	0.3652-0.21017i
		56	0.56174-0.25432i

[0031]

57	0.53795-0.30218i
		58	0.54523-0.24853i
59	0.52302-0.29283i
		60	0.3927-0.20681i
61	0.38393-0.22056i
		62	0.37387-0.20412i
63	0.36644-0.21564i
		64	-0.2975-1.0564i
65	-0.5862-0.9617i
		66	-0.2909-1.0696i
67	-0.5796-0.9689i
		68	-0.2953-1.3357i
69	-0.7488-1.2365i
		70	-0.3004-1.5114i
71	-0.8151-1.3816i
		72	-0.3004-1.0535i
73	-0.5847-0.9631i
		74	-0.2931-1.0659i
75	-0.5825-0.9668i
		76	-0.2953-1.3189i
77	-0.7466-1.2168i
		78	-0.296-1.4654i

[0032]

79	-0.8297-1.3539i
		80	-1.0637-0.296i
81	-0.9617-0.5811i
		82	-1.0732-0.2931i
83	-0.9682-0.5818i
		84	-1.3619-0.2997i
85	-1.2249-0.7546i
		86	-1.5427-0.3106i
87	-1.3969-0.8523i
		88	-1.0615-0.2945i
89	-0.9631-0.5818i
		90	-1.071-0.2924i
91	-0.9675-0.5825i
		92	-1.3255-0.2975i
93	-1.1979-0.7495i
		94	-1.456-0.304i
95	-1.3269-0.8414i
		96	-0.24362-0.561i
97	-0.29056-0.53737i
		98	-0.23727-0.54513i
99	-0.27988-0.52313i
		100	-0.2031-0.39313i

[0033]

101	-0.21726-0.38062i
		102	-0.19462-0.37779i
103	-0.21101-0.36432i
		104	-0.24359-0.5624i
105	-0.29204-0.53809i
		106	-0.23998-0.54613i
107	-0.28388-0.52394i
		108	-0.20369-0.39469i
109	-0.21684-0.38305i
		110	-0.19545-0.37848i
111	-0.20796-0.36912i
		112	-0.55815-0.25428i
113	-0.53507-0.30144i
		114	-0.54037-0.25191i
115	-0.51787-0.2939i
		116	-0.39171-0.20314i
117	-0.38133-0.21724i
		118	-0.376-0.196i
119	-0.3652-0.21017i
		120	-0.56174-0.25432i
121	-0.53795-0.30218i
		122	-0.54523-0.24853i

[0034]

123	-0.52302-0.29283i
		124	-0.3927-0.20681i
125	-0.38393-0.22056i
		126	-0.37387-0.20412i
127	-0.36644-0.21564i
		128	0.2975+1.0564i
129	0.5862+0.9617i
		130	0.2909+1.0696i
131	0.5796+0.9689i
		132	0.2953+1.3357i
133	0.7488+1.2365i
		134	0.3004+1.5114i
135	0.8151+1.3816i
		136	0.3004+1.0535i
137	0.5847+0.9631i
		138	0.2931+1.0659i
139	0.5825+0.9668i
		140	0.2953+1.3189i
141	0.7466+1.2168i
		142	0.296+1.4654i
143	0.8297+1.3539i
		144	1.0637+0.296i

[0035]

145	0.9617+0.5811i
		146	1.0732+0.2931i
147	0.9682+0.5818i
		148	1.3619+0.2997i
149	1.2249+0.7546i
		150	1.5427+0.3106i
151	1.3969+0.8523i
		152	1.0615+0.2945i
153	0.9631+0.5818i
		154	1.071+0.2924i
155	0.9675+0.5825i
		156	1.3255+0.2975i
157	1.1979+0.7495i
		158	1.456+0.304i
159	1.3269+0.8414i
		160	0.24362+0.561i
161	0.29056+0.53737i
		162	0.23727+0.54513i
163	0.27988+0.52313i
		164	0.2031+0.39313i
165	0.21726+0.38062i
		166	0.19462+0.37779i

[0036]

167	0.21101+0.36432i
		168	0.24359+0.5624i
169	0.29204+0.53809i
		170	0.23998+0.54613i
171	0.28388+0.52394i
		172	0.20369+0.39469i
173	0.21684+0.38305i
		174	0.19545+0.37848i
175	0.20796+0.36912i
		176	0.55815+0.25428i
177	0.53507+0.30144i
		178	0.54037+0.25191i
179	0.51787+0.2939i
		180	0.39171+0.20314i
181	0.38133+0.21724i
		182	0.376+0.196i
183	0.3652+0.21017i
		184	0.56174+0.25432i
185	0.53795+0.30218i
		186	0.54523+0.24853i
187	0.52302+0.29283i
		188	0.3927+0.20681i

[0037]

189	0.38393+0.22056i
		190	0.37387+0.20412i
191	0.36644+0.21564i
		192	-0.2975+1.0564i
193	-0.5862+0.9617i
		194	-0.2909+1.0696i
195	-0.5796+0.9689i
		196	-0.2953+1.3357i
197	-0.7488+1.2365i
		198	-0.3004+1.5114i
199	-0.8151+1.3816i
		200	-0.3004+1.0535i
201	-0.5847+0.9631i
		202	-0.2931+1.0659i
203	-0.5825+0.9668i
		204	-0.2953+1.3189i
205	-0.7466+1.2168i
		206	-0.296+1.4654i
207	-0.8297+1.3539i
		208	-1.0637+0.296i
209	-0.9617+0.5811i
		210	-1.0732+0.2931i

[0038]

211	-0.9682+0.5818i
		212	-1.3619+0.2997i
213	-1.2249+0.7546i
		214	-1.5427+0.3106i
215	-1.3969+0.8523i
		216	-1.0615+0.2945i
217	-0.9631+0.5818i
		218	-1.071+0.2924i
219	-0.9675+0.5825i
		220	-1.3255+0.2975i
221	-1.1979+0.7495i
		222	-1.456+0.304i
223	-1.3269+0.8414i
		224	-0.24362+0.561i
225	-0.29056+0.53737i
		226	-0.23727+0.54513i
227	-0.27988+0.52313i
		228	-0.2031+0.39313i
229	-0.21726+0.38062i
		230	-0.19462+0.37779i
231	-0.21101+0.36432i
		232	-0.24359+0.5624i

[0039]

233	-0.29204+0.53809i
		234	-0.23998+0.54613i
235	-0.28388+0.52394i
		236	-0.20369+0.39469i
237	-0.21684+0.38305i
		238	-0.19545+0.37848i
239	-0.20796+0.36912i
		240	-0.55815+0.25428i
241	-0.53507+0.30144i
		242	-0.54037+0.25191i
243	-0.51787+0.2939i
		244	-0.39171+0.20314i
245	-0.38133+0.21724i
		246	-0.376+0.196i
247	-0.3652+0.21017i
		248	-0.56174+0.25432i
249	-0.53795+0.30218i
		250	-0.54523+0.24853i
251	-0.52302+0.29283i
		252	-0.3927+0.20681i
253	-0.38393+0.22056i
		254	-0.37387+0.20412i

[0040]

255	-0.36644+0.21564i

In described step S14, such as, be the LDPC code word (the LDPC code word after second time Bit Interleave) of 57600 bits for code length, its column major order write memory space is also sequentially read by row in this memory space, wherein every row 7200 bit, totally 8 row.

Afterwards to the bitstream data (b after above-mentioned Bit Interleave ₀, b ₁..., b _n-1), according to 256QAM planisphere, the decimal number corresponding to every eight binary bit sequence is mapped to some constellation point, obtains symbol stream (the corresponding constellation point of each complex symbol).Such as, the corresponding decimal number of 8 bits ' 00001101 ' of input is 13, then correspond to the constellation point of the 0.7466-1.2168i in 256QAM planisphere, this constellation point being shown as on real number axis and axis of imaginaries, real number axis 0.7466, axis of imaginaries-1.2168.Then utilize symbol stream to carry out generation OFDM symbol at modulation module, finally launch.

In the present embodiment, described LDPC code word be to message sink coding after bit stream obtain after specific LDPC coding, wherein said specific LDPC coding can adopt prior art to realize.

Particularly, the code word of this LDPC is with L × L (L is generally 320) for sub-block size, and code table is as follows:

Table 1 code check 1/4N _ldpc=57600, L × L=320 × 320, Q=135, M1=1600, M2=41600

Its coding method is as follows:

By the bit stream after message sink coding, be split as block of information one by one, each block of information is made up of K information bit, is expressed as S=(s ₀, s ₁..., s _k-1).By the specific LDPC coding in Fig. 1, be will according to S=(s ₀, s ₁..., s _k-1) generate M ₁+ M ₂individual check bit namely the code word Λ=(λ of N number of bit is obtained ₀, λ ₁..., λ _n-1), wherein N=K+M ₁+ M ₂.Λ can be expressed as again, $\mathrm{\Λ}=(s_0,s_1,...,s_{K-1},p_0,p_1,...,p_{M_1+M_2-1}).$

The step of coding is:

1) initialization λ _i=s _i, i=0,1 ..., K-1.p _j＝0，j＝0,1,...,M ₁+M ₂-1

2) to information bit λ ₀, add up for the check bit of address to the first row numeral in code table, lift table 1 code check 1/4, the code table of code length 57600 is example:

Because its first row numeral is:

42649712257755113121736717888218922396825071360193901739063

$p_{426}=p_{426}\⊕{\mathrm{\λ}}_0,p_{497}=p_{497}\⊕{\mathrm{\λ}}_0,p_{1225}=p_{1225}\⊕{\mathrm{\λ}}_0,......,$ $p_{39017}=p_{39017}\⊕{\mathrm{\λ}}_0,p_{39063}=p_{39063}\⊕{\mathrm{\λ}}_0.$

3) for an ensuing L-1 information bit, (usual L=320), λ _m, m=1,2 ...., L-1, adds up with the check bit according to following y being address respectively by each information bit:

$y=\left\{\begin{array}{cc}(x+m\&times;Q_1)\mathrm{mod}{M}_1& \mathrm{ifx}<M_1\\ M_1+\left\{(x-M_1+m\&times;Q_2)\mathrm{mod}{M}_2\right\}& \mathrm{ifx}>M_1\end{array}\right.$

Wherein, x refers to and λ ₀relevant check digit address, act table 1 is example, the numeral 42,649,712,257,755,113,121,736,717,888,218,922,396,825,071,360,193,901,739 063 of the first row in x and code table.And

Code word for table 1 is example,

$Q_1=\frac{M_1}{L}=\frac{1600}{320}=5,Q_2=\frac{M_2}{L}=\frac{41600}{320}=130.$

$p_{431}=p_{431}\&CirclePlus;{\mathrm{\&lambda;}}_1,p_{502}=p_{502}\&CirclePlus;{\mathrm{\&lambda;}}_1,p_{1230}=p_{1230}\&CirclePlus;{\mathrm{\&lambda;}}_1,......,$ $p_{39147}=p_{39147}\&CirclePlus;{\mathrm{\&lambda;}}_1,p_{39193}=p_{39193}\&CirclePlus;{\mathrm{\&lambda;}}_1.$

4) for L information bit λ _l, according to the second line number word address in code table, check bit is added up.Same for an ensuing L-1 information bit, to continue according to step 3) in formula check bit is added up, the at this time numeral of the second row in the x of the formula of step 3 kind and code table.

5) in like manner, for 2L, 3L, 4L ... iL ... individual information bit, according to difference the 3rd in code table, 4, 5, (i+1) add up to check bit in the address that L.... is capable, L-1 information bit after its information bit is then respectively according to step 3) in formula check bit is added up, note the x of the formula of at this time step 3 kind corresponding be row in code table corresponding to a current i-th L information bit, L-1 bit after such as the i-th L information bit, its applying step 3) in formula time corresponding x address be (i+1) in code table OK.

6) step 5 is finished) after, be done as follows:

wherein i=1,2 ..., M ₁-1

The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word.As shown in Figure 2 be the schematic flow sheet of the embodiment of the deinterleaving de-mapping method of a kind of LDPC code word of the present invention.With reference to figure 2, the deinterleaving de-mapping method of LDPC code word comprises the steps:

Step S21: soft demapping process is carried out to obtain bit soft value data according to corresponding planisphere to symbol stream soft value data;

Step S22: described bit soft value data are sequentially written in memory space by row and column major order reads to obtain first time than the bit soft value data after deinterleave in this memory space;

Step S23: described first time is divided into the multiple bit soft value data sub-block of continuous print than the bit soft value data after deinterleave by predetermined length, and according to bit soft value data sub-block described in corresponding bit exchange pattern change put in order form second time than the bit soft value data after deinterleave;

Step S24: described second time is carried out third time than deinterleave to obtain third time than the bit soft value data after deinterleave than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave;

Step S25: described second time is spliced into bit soft value data flow with described third time than the bit soft value data after deinterleave than in the bit soft value data after deinterleave;

Step S26: LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.

In the present embodiment, described step S24 specifically comprises: described second time is sequentially written in memory space by row than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave and column major order reads to obtain third time than the bit soft value data after deinterleave in this memory space.

By the coding of above-mentioned LDPC, intertexture and modulation system, the thresholding of system under awgn channel can be made to reach 6.11, and the thresholding under rayleigh fading channel reaches 7.95, effectively can increase coverage rate.

Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.

Claims (7)

1. an interlace map method for LDPC code word, is characterized in that, comprise the steps:

Check part in described LDPC code word is carried out first time Bit Interleave to obtain check bit stream;

Information bit part in described LDPC code word and described check bit stream are spliced into the LDPC code word after first time Bit Interleave;

LDPC code word after described first time Bit Interleave is divided into the multiple sub-blocks of bits of continuous print by predetermined length, and puts in order the LDPC code word after forming second time Bit Interleave according to sub-blocks of bits described in corresponding bit exchange pattern change;

LDPC code word column major order write memory space after described second time Bit Interleave is also sequentially read by row in this memory space, obtains the LDPC code word after third time Bit Interleave;

Constellation mapping is carried out to obtain symbol stream according to corresponding planisphere to the LDPC code word after described third time Bit Interleave; Wherein, described bit exchange pattern and described planisphere are all corresponding from the LDPC code table of different code check.

2. the interlace map method of LDPC code word as claimed in claim 1, is characterized in that, the check part in described LDPC code word is carried out first time Bit Interleave and comprises to obtain check bit stream:

Check part column major order write memory space in described LDPC code word also is sequentially read to obtain check bit stream by row in this memory space.

3. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, described predetermined length is 320 bits.

4. the interlace map method of LDPC code word as claimed in claim 1, is characterized in that, in described LDPC code table, the code length of LDPC code word is 57600 bits, code check is 1/4; Code table is:

Corresponding bit exchange pattern is: 38,826,564,211,648,810,965,681,711,451,251,505,914,071,731,193,426,281,769 61,102,235,451,241,659,127,630,137,785,179,154,163,331,166,711,260,171,274 01,351,041,034,920,136,102,471,001,774,416,106,155,321,695,352,431,079,217 50,574,666,141,251,111,171,461,209,515,815,513,012,193,863,115,914,424,197 29,481,877,314,581,281,129,915,468,156,138,126,621,422,741,142,168,971,701 31,749,810,812,912,277,181,341,663,715,211,837,099,891,539,011,316,110,514 31,518,061,167,139,179,147,523,101,132,633,948,691,510,421,151,495,013,317 27585368441178711231317483160157162148

Corresponding planisphere is:

Constellation point Complex symbol 0 0.2975-1.0564i 1 0.5862-0.9617i 2 0.2909-1.0696i 3 0.5796-0.9689i 4 0.2953-1.3357i 5 0.7488-1.2365i 6 0.3004-1.5114i 7 0.8151-1.3816i 8 0.3004-1.0535i 9 0.5847-0.9631i 10 0.2931-1.0659i 11 0.5825-0.9668i 12 0.2953-1.3189i 13 0.7466-1.2168i

14 0.296-1.4654i 15 0.8297-1.3539i 16 1.0637-0.296i 17 0.9617-0.5811i 18 1.0732-0.2931i 19 0.9682-0.5818i 20 1.3619-0.2997i 21 1.2249-0.7546i 22 1.5427-0.3106i 23 1.3969-0.8523i 24 1.0615-0.2945i 25 0.9631-0.5818i 26 1.071-0.2924i 27 0.9675-0.5825i 28 1.3255-0.2975i 29 1.1979-0.7495i 30 1.456-0.304i 31 1.3269-0.8414i 32 0.24362-0.561i 33 0.29056-0.53737i 34 0.23727-0.54513i

35 0.27988-0.52313i 36 0.2031-0.39313i 37 0.21726-0.38062i 38 0.19462-0.37779i 39 0.21101-0.36432i 40 0.24359-0.5624i 41 0.29204-0.53809i 42 0.23998-0.54613i 43 0.28388-0.52394i 44 0.20369-0.39469i 45 0.21684-0.38305i 46 0.19545-0.37848i 47 0.20796-0.36912i 48 0.55815-0.25428i 49 0.53507-0.30144i 50 0.54037-0.25191i 51 0.51787-0.2939i 52 0.39171-0.20314i 53 0.38133-0.21724i 54 0.376-0.196i 55 0.3652-0.21017i

56 0.56174-0.25432i 57 0.53795-0.30218i 58 0.54523-0.24853i 59 0.52302-0.29283i 60 0.3927-0.20681i 61 0.38393-0.22056i 62 0.37387-0.20412i 63 0.36644-0.21564i 64 -0.2975-1.0564i 65 -0.5862-0.9617i 66 -0.2909-1.0696i 67 -0.5796-0.9689i 68 -0.2953-1.3357i 69 -0.7488-1.2365i 70 -0.3004-1.5114i 71 -0.8151-1.3816i 72 -0.3004-1.0535i 73 -0.5847-0.9631i 74 -0.2931-1.0659i 75 -0.5825-0.9668i 76 -0.2953-1.3189i

77 -0.7466-1.2168i 78 -0.296-1.4654i 79 -0.8297-1.3539i 80 -1.0637-0.296i 81 -0.9617-0.5811i 82 -1.0732-0.2931i 83 -0.9682-0.5818i 84 -1.3619-0.2997i 85 -1.2249-0.7546i 86 -1.5427-0.3106i 87 -1.3969-0.8523i 88 -1.0615-0.2945i 89 -0.9631-0.5818i 90 -1.071-0.2924i 91 -0.9675-0.5825i 92 -1.3255-0.2975i 93 -1.1979-0.7495i 94 -1.456-0.304i 95 -1.3269-0.8414i 96 -0.24362-0.561i 97 -0.29056-0.53737i

98 -0.23727-0.54513i 99 -0.27988-0.52313i 100 -0.2031-0.39313i 101 -0.21726-0.38062i 102 -0.19462-0.37779i 103 -0.21101-0.36432i 104 -0.24359-0.5624i 105 -0.29204-0.53809i 106 -0.23998-0.54613i 107 -0.28388-0.52394i 108 -0.20369-0.39469i 109 -0.21684-0.38305i 110 -0.19545-0.37848i 111 -0.20796-0.36912i 112 -0.55815-0.25428i 113 -0.53507-0.30144i 114 -0.54037-0.25191i 115 -0.51787-0.2939i 116 -0.39171-0.20314i 117 -0.38133-0.21724i 118 -0.376-0.196i

119 -0.3652-0.21017i 120 -0.56174-0.25432i 121 -0.53795-0.30218i 122 -0.54523-0.24853i 123 -0.52302-0.29283i 124 -0.3927-0.20681i 125 -0.38393-0.22056i 126 -0.37387-0.20412i 127 -0.36644-0.21564i 128 0.2975+1.0564i 129 0.5862+0.9617i 130 0.2909+1.0696i 131 0.5796+0.9689i 132 0.2953+1.3357i 133 0.7488+1.2365i 134 0.3004+1.5114i 135 0.8151+1.3816i 136 0.3004+1.0535i 137 0.5847+0.9631i 138 0.2931+1.0659i 139 0.5825+0.9668i

140 0.2953+1.3189i 141 0.7466+1.2168i 142 0.296+1.4654i 143 0.8297+1.3539i 144 1.0637+0.296i 145 0.9617+0.5811i 146 1.0732+0.2931i 147 0.9682+0.5818i 148 1.3619+0.2997i 149 1.2249+0.7546i 150 1.5427+0.3106i 151 1.3969+0.8523i 152 1.0615+0.2945i 153 0.9631+0.5818i 154 1.071+0.2924i 155 0.9675+0.5825i 156 1.3255+0.2975i 157 1.1979+0.7495i 158 1.456+0.304i 159 1.3269+0.8414i 160 0.24362+0.561i

161 0.29056+0.53737i 162 0.23727+0.54513i 163 0.27988+0.52313i 164 0.2031+0.39313i 165 0.21726+0.38062i 166 0.19462+0.37779i 167 0.21101+0.36432i 168 0.24359+0.5624i 169 0.29204+0.53809i 170 0.23998+0.54613i 171 0.28388+0.52394i 172 0.20369+0.39469i 173 0.21684+0.38305i 174 0.19545+0.37848i 175 0.20796+0.36912i 176 0.55815+0.25428i 177 0.53507+0.30144i 178 0.54037+0.25191i 179 0.51787+0.2939i 180 0.39171+0.20314i 181 0.38133+0.21724i

182 0.376+0.196i 183 0.3652+0.21017i 184 0.56174+0.25432i 185 0.53795+0.30218i 186 0.54523+0.24853i 187 0.52302+0.29283i 188 0.3927+0.20681i 189 0.38393+0.22056i 190 0.37387+0.20412i 191 0.36644+0.21564i 192 -0.2975+1.0564i 193 -0.5862+0.9617i 194 -0.2909+1.0696i 195 -0.5796+0.9689i 196 -0.2953+1.3357i 197 -0.7488+1.2365i 198 -0.3004+1.5114i 199 -0.8151+1.3816i 200 -0.3004+1.0535i 201 -0.5847+0.9631i 202 -0.2931+1.0659i

203 -0.5825+0.9668i 204 -0.2953+1.3189i 205 -0.7466+1.2168i 206 -0.296+1.4654i 207 -0.8297+1.3539i 208 -1.0637+0.296i 209 -0.9617+0.5811i 210 -1.0732+0.2931i 211 -0.9682+0.5818i 212 -1.3619+0.2997i 213 -1.2249+0.7546i 214 -1.5427+0.3106i 215 -1.3969+0.8523i 216 -1.0615+0.2945i 217 -0.9631+0.5818i 218 -1.071+0.2924i 219 -0.9675+0.5825i 220 -1.3255+0.2975i 221 -1.1979+0.7495i 222 -1.456+0.304i 223 -1.3269+0.8414i

224 -0.24362+0.561i 225 -0.29056+0.53737i 226 -0.23727+0.54513i 227 -0.27988+0.52313i 228 -0.2031+0.39313i 229 -0.21726+0.38062i 230 -0.19462+0.37779i 231 -0.21101+0.36432i 232 -0.24359+0.5624i 233 -0.29204+0.53809i 234 -0.23998+0.54613i 235 -0.28388+0.52394i 236 -0.20369+0.39469i 237 -0.21684+0.38305i 238 -0.19545+0.37848i 239 -0.20796+0.36912i 240 -0.55815+0.25428i 241 -0.53507+0.30144i 242 -0.54037+0.25191i 243 -0.51787+0.2939i 244 -0.39171+0.20314i

245 -0.38133+0.21724i 246 -0.376+0.196i 247 -0.3652+0.21017i 248 -0.56174+0.25432i 249 -0.53795+0.30218i 250 -0.54523+0.24853i 251 -0.52302+0.29283i 252 -0.3927+0.20681i 253 -0.38393+0.22056i 254 -0.37387+0.20412i 255 -0.36644+0.21564i

5. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the number of described column major order is 8 row.

6. a deinterleaving de-mapping method for LDPC code word, is characterized in that, comprise the steps:

Soft demapping process is carried out to obtain bit soft value data according to corresponding planisphere to symbol stream soft value data; Wherein said symbol stream soft value data are the symbol stream that interlace map method that receiving terminal receives LDPC code word as claimed in claim 1 obtains;

Described bit soft value data are sequentially written in memory space by row and column major order reads to obtain first time than the bit soft value data after deinterleave in this memory space;

Described first time is divided into the multiple bit soft value data sub-block of continuous print than the bit soft value data after deinterleave by predetermined length, and according to bit soft value data sub-block described in corresponding bit exchange pattern change put in order form second time than the bit soft value data after deinterleave;

Described second time is carried out third time than deinterleave to obtain third time than the bit soft value data after deinterleave than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave;

Described second time is spliced into bit soft value data flow with described third time than the bit soft value data after deinterleave than in the bit soft value data after deinterleave;

LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.

7. the deinterleaving de-mapping method of LDPC code word as claimed in claim 6, it is characterized in that, describedly described second time is carried out third time than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave comprise than the bit soft value data after deinterleave to obtain third time than deinterleave:

Described second time is sequentially written in memory space by row than the bit soft value data of the check part corresponded in LDPC code word in the bit soft value data after deinterleave and column major order reads in this memory space, the described columns that also column major order reads of write is by row 8 row, obtains third time than the bit soft value data after deinterleave.