CN105450333A - Interleaving mapping method and de-interleaving de-mapping method for LDPC code words - Google Patents

Interleaving mapping method and de-interleaving de-mapping method for LDPC code words Download PDF

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Publication number
CN105450333A
CN105450333A CN201410409149.5A CN201410409149A CN105450333A CN 105450333 A CN105450333 A CN 105450333A CN 201410409149 A CN201410409149 A CN 201410409149A CN 105450333 A CN105450333 A CN 105450333A
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CN
China
Prior art keywords
bit
ldpc code
time
code word
value data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201410409149.5A
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Chinese (zh)
Inventor
张文军
赵杰
史毅俊
徐胤
徐洪亮
何大治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai National Engineering Research Center of Digital Television Co Ltd
Original Assignee
Shanghai National Engineering Research Center of Digital Television Co Ltd
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Filing date
Publication date
Application filed by Shanghai National Engineering Research Center of Digital Television Co Ltd filed Critical Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority to CN201710408189.1A priority Critical patent/CN107204828A/en
Priority to CN201410409149.5A priority patent/CN105450333A/en
Publication of CN105450333A publication Critical patent/CN105450333A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points

Abstract

An interleaving mapping method and de-interleaving de-mapping method for LDPC code words include the steps of: performing bit interleaving of a first time on a check part in the LDPC code words to obtain a check bit stream; splicing an information bit part in the LDPC code words and the check bit stream into LDPC code words after the bit interleaving of the first time; dividing the LDPC code words after the bit interleaving of the first time into continuous multiple bit subblocks according to a predetermined length and transforming an arrangement sequence of the bit subblocks according to a corresponding bit exchange pattern to form LDPC code words after bit interleaving of a second time; writing the LDPC code words after bit interleaving of the second time according to a column sequence and reading according to a row sequence to obtain LDPC code words after bit interleaving of a third time; and performing constellation mapping on the LDPC code words after interleaving of the third time according to a constellation diagram to obtain a symbol stream. The interleaving mapping and de-interleaving de-mapping methods are selected for different LDPC code tables, thereby enabling system performance to be well improved.

Description

The interlace map method of LDPC code word 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 1024QAM 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 1024QAM 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: 34,188,191,727,819,153,101,621,463,571,277,365,171,126,706,116,993,176,507 41,118,111,101,431,741,313,137,842,615,122,127,431,171,514,031,561,642,116 76,511,023,229,874,617,998,150,334,915,215,989,138,671,144,016,516,461,081 04,837,178,921,201,392,816,012,811,568,141,174,812,112,416,724,969,079,307 21,331,736,910,501,182,055,103,135,991,071,129,197,311,701,291,255,255,794 25,168,851,633,912,238,132,608,014,635,615,812,310,666,419,515,317,782,441 75,119,546,211,315,747,142,771,454,515,413,010,013,721,475,881,441,091,016 41348614713614936148155161235821259166
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 18 implication in above-mentioned bit exchange pattern refers to and original after bit exchange, nowadays becomes second sub-blocks of bits without the 19th sub-blocks of bits before bit exchange.
Corresponding planisphere is:
Constellation point Complex symbol
0 1.4377+1.4377i
1 1.2232+1.4377i
2 1.4377+1.2232i
3 1.2232+1.2232i
4 0.9302+1.4377i
5 1.0579+1.4377i
6 0.9302+1.2232i
7 1.0579+1.2232i
8 1.4377+0.9302i
9 1.2232+0.9302i
10 1.4377+1.0579i
11 1.2232+1.0579i
12 0.9302+0.9302i
[0029]
13 1.0579+0.9302i
14 0.9302+1.0579i
15 1.0579+1.0579i
16 0.5505+1.4377i
17 0.6150+1.4377i
18 0.5505+1.2232i
19 0.6150+1.2232i
20 0.8066+1.4377i
21 0.7158+1.4377i
22 0.8066+1.2232i
23 0.7158+1.2232i
24 0.5505+0.9302i
25 0.6150+0.9302i
26 0.5505+1.0579i
27 0.6150+1.0579i
28 0.8066+0.9302i
29 0.7158+0.9302i
30 0.8066+1.0579i
31 0.7158+1.0579i
32 1.4377+0.5505i
33 1.2232+0.5505i
34 1.4377+0.6150i
[0030]
35 1.2232+0.6150i
36 0.9302+0.5505i
37 1.0579+0.5505i
38 0.9302+0.6150i
39 1.0579+0.6150i
40 1.4377+0.8066i
41 1.2232+0.8066i
42 1.4377+0.7158i
43 1.2232+0.7158i
44 0.9302+0.8066i
45 1.0579+0.8066i
46 0.9302+0.7158i
47 1.0579+0.7158i
48 0.5505+0.5505i
49 0.6150+0.5505i
50 0.5505+0.6150i
51 0.6150+0.6150i
52 0.8066+0.5505i
53 0.7158+0.5505i
54 0.8066+0.6150i
55 0.7158+0.6150i
56 0.5505+0.8066i
[0031]
57 0.6150+0.8066i
58 0.5505+0.7158i
59 0.6150+0.7158i
60 0.8066+0.8066i
61 0.7158+0.8066i
62 0.8066+0.7158i
63 0.7158+0.7158i
64 0.0596+1.4377i
65 0.0642+1.4377i
66 0.0596+1.2232i
67 0.0642+1.2232i
68 0.1766+1.4377i
69 0.1669+1.4377i
70 0.1766+1.2232i
71 0.1669+1.2232i
72 0.0596+0.9302i
73 0.0642+0.9302i
74 0.0596+1.0579i
75 0.0642+1.0579i
76 0.1766+0.9302i
77 0.1669+0.9302i
78 0.1766+1.0579i
[0032]
79 0.1669+1.0579i
80 0.4471+1.4377i
81 0.4043+1.4377i
82 0.4471+1.2232i
83 0.4043+1.2232i
84 0.2868+1.4377i
85 0.3091+1.4377i
86 0.2868+1.2232i
87 0.3091+1.2232i
88 0.4471+0.9302i
89 0.4043+0.9302i
90 0.4471+1.0579i
91 0.4043+1.0579i
92 0.2868+0.9302i
93 0.3091+0.9302i
94 0.2868+1.0579i
95 0.3091+1.0579i
96 0.0596+0.5505i
97 0.0642+0.5505i
98 0.0596+0.6150i
99 0.0642+0.6150i
100 0.1766+0.5505i
[0033]
101 0.1669+0.5505i
102 0.1766+0.6150i
103 0.1669+0.6150i
104 0.0596+0.8066i
105 0.0642+0.8066i
106 0.0596+0.7158i
107 0.0642+0.7158i
108 0.1766+0.8066i
109 0.1669+0.8066i
110 0.1766+0.7158i
111 0.1669+0.7158i
112 0.4471+0.5505i
113 0.4043+0.5505i
114 0.4471+0.6150i
115 0.4043+0.6150i
116 0.2868+0.5505i
117 0.3091+0.5505i
118 0.2868+0.6150i
119 0.3091+0.6150i
120 0.4471+0.8066i
121 0.4043+0.8066i
122 0.4471+0.7158i
[0034]
123 0.4043+0.7158i
124 0.2868+0.8066i
125 0.3091+0.8066i
126 0.2868+0.7158i
127 0.3091+0.7158i
128 1.4377+0.0596i
129 1.2232+0.0596i
130 1.4377+0.0642i
131 1.2232+0.0642i
132 0.9302+0.0596i
133 1.0579+0.0596i
134 0.9302+0.0642i
135 1.0579+0.0642i
136 1.4377+0.1766i
137 1.2232+0.1766i
138 1.4377+0.1669i
139 1.2232+0.1669i
140 0.9302+0.1766i
141 1.0579+0.1766i
142 0.9302+0.1669i
143 1.0579+0.1669i
144 0.5505+0.0596i
[0035]
145 0.6150+0.0596i
146 0.5505+0.0642i
147 0.6150+0.0642i
148 0.8066+0.0596i
149 0.7158+0.0596i
150 0.8066+0.0642i
151 0.7158+0.0642i
152 0.5505+0.1766i
153 0.6150+0.1766i
154 0.5505+0.1669i
155 0.6150+0.1669i
156 0.8066+0.1766i
157 0.7158+0.1766i
158 0.8066+0.1669i
159 0.7158+0.1669i
160 1.4377+0.4471i
161 1.2232+0.4471i
162 1.4377+0.4043i
163 1.2232+0.4043i
164 0.9302+0.4471i
165 1.0579+0.4471i
166 0.9302+0.4043i
[0036]
167 1.0579+0.4043i
168 1.4377+0.2868i
169 1.2232+0.2868i
170 1.4377+0.3091i
171 1.2232+0.3091i
172 0.9302+0.2868i
173 1.0579+0.2868i
174 0.9302+0.3091i
175 1.0579+0.3091i
176 0.5505+0.4471i
177 0.6150+0.4471i
178 0.5505+0.4043i
179 0.6150+0.4043i
180 0.8066+0.4471i
181 0.7158+0.4471i
182 0.8066+0.4043i
183 0.7158+0.4043i
184 0.5505+0.2868i
185 0.6150+0.2868i
186 0.5505+0.3091i
187 0.6150+0.3091i
188 0.8066+0.2868i
[0037]
189 0.7158+0.2868i
190 0.8066+0.3091i
191 0.7158+0.3091i
192 0.0596+0.0596i
193 0.0642+0.0596i
194 0.0596+0.0642i
195 0.0642+0.0642i
196 0.1766+0.0596i
197 0.1669+0.0596i
198 0.1766+0.0642i
199 0.1669+0.0642i
200 0.0596+0.1766i
201 0.0642+0.1766i
202 0.0596+0.1669i
203 0.0642+0.1669i
204 0.1766+0.1766i
205 0.1669+0.1766i
206 0.1766+0.1669i
207 0.1669+0.1669i
208 0.4471+0.0596i
209 0.4043+0.0596i
210 0.4471+0.0642i
[0038]
211 0.4043+0.0642i
212 0.2868+0.0596i
213 0.3091+0.0596i
214 0.2868+0.0642i
215 0.3091+0.0642i
216 0.4471+0.1766i
217 0.4043+0.1766i
218 0.4471+0.1669i
219 0.4043+0.1669i
220 0.2868+0.1766i
221 0.3091+0.1766i
222 0.2868+0.1669i
223 0.3091+0.1669i
224 0.0596+0.4471i
225 0.0642+0.4471i
226 0.0596+0.4043i
227 0.0642+0.4043i
228 0.1766+0.4471i
229 0.1669+0.4471i
230 0.1766+0.4043i
231 0.1669+0.4043i
232 0.0596+0.2868i
[0039]
233 0.0642+0.2868i
234 0.0596+0.3091i
235 0.0642+0.3091i
236 0.1766+0.2868i
237 0.1669+0.2868i
238 0.1766+0.3091i
239 0.1669+0.3091i
240 0.4471+0.4471i
241 0.4043+0.4471i
242 0.4471+0.4043i
243 0.4043+0.4043i
244 0.2868+0.4471i
245 0.3091+0.4471i
246 0.2868+0.4043i
247 0.3091+0.4043i
248 0.4471+0.2868i
249 0.4043+0.2868i
250 0.4471+0.3091i
251 0.4043+0.3091i
252 0.2868+0.2868i
253 0.3091+0.2868i
254 0.2868+0.3091i
[0040]
255 0.3091+0.3091i
256 -1.4377+1.4377i
257 -1.2232+1.4377i
258 -1.4377+1.2232i
259 -1.2232+1.2232i
260 -0.9302+1.4377i
261 -1.0579+1.4377i
262 -0.9302+1.2232i
263 -1.0579+1.2232i
264 -1.4377+0.9302i
265 -1.2232+0.9302i
266 -1.4377+1.0579i
267 -1.2232+1.0579i
268 -0.9302+0.9302i
269 -1.0579+0.9302i
270 -0.9302+1.0579i
271 -1.0579+1.0579i
272 -0.5505+1.4377i
273 -0.6150+1.4377i
274 -0.5505+1.2232i
275 -0.6150+1.2232i
276 -0.8066+1.4377i
[0041]
277 -0.7158+1.4377i
278 -0.8066+1.2232i
279 -0.7158+1.2232i
280 -0.5505+0.9302i
281 -0.6150+0.9302i
282 -0.5505+1.0579i
283 -0.6150+1.0579i
284 -0.8066+0.9302i
285 -0.7158+0.9302i
286 -0.8066+1.0579i
287 -0.7158+1.0579i
288 -1.4377+0.5505i
289 -1.2232+0.5505i
290 -1.4377+0.6150i
291 -1.2232+0.6150i
292 -0.9302+0.5505i
293 -1.0579+0.5505i
294 -0.9302+0.6150i
295 -1.0579+0.6150i
296 -1.4377+0.8066i
297 -1.2232+0.8066i
298 -1.4377+0.7158i
[0042]
299 -1.2232+0.7158i
300 -0.9302+0.8066i
301 -1.0579+0.8066i
302 -0.9302+0.7158i
303 -1.0579+0.7158i
304 -0.5505+0.5505i
305 -0.6150+0.5505i
306 -0.5505+0.6150i
307 -0.6150+0.6150i
308 -0.8066+0.5505i
309 -0.7158+0.5505i
310 -0.8066+0.6150i
311 -0.7158+0.6150i
312 -0.5505+0.8066i
313 -0.6150+0.8066i
314 -0.5505+0.7158i
315 -0.6150+0.7158i
316 -0.8066+0.8066i
317 -0.7158+0.8066i
318 -0.8066+0.7158i
319 -0.7158+0.7158i
320 -0.0596+1.4377i
[0043]
321 -0.0642+1.4377i
322 -0.0596+1.2232i
323 -0.0642+1.2232i
324 -0.1766+1.4377i
325 -0.1669+1.4377i
326 -0.1766+1.2232i
327 -0.1669+1.2232i
328 -0.0596+0.9302i
329 -0.0642+0.9302i
330 -0.0596+1.0579i
331 -0.0642+1.0579i
332 -0.1766+0.9302i
333 -0.1669+0.9302i
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[0050]
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[0065]
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[0070]
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916 -0.8066-0.0596i
917 -0.7158-0.0596i
918 -0.8066-0.0642i
919 -0.7158-0.0642i
920 -0.5505-0.1766i
921 -0.6150-0.1766i
922 -0.5505-0.1669i
923 -0.6150-0.1669i
924 -0.8066-0.1766i
925 -0.7158-0.1766i
926 -0.8066-0.1669i
927 -0.7158-0.1669i
928 -1.4377-0.4471i
929 -1.2232-0.4471i
930 -1.4377-0.4043i
931 -1.2232-0.4043i
932 -0.9302-0.4471i
933 -1.0579-0.4471i
934 -0.9302-0.4043i
935 -1.0579-0.4043i
936 -1.4377-0.2868i
[0071]
937 -1.2232-0.2868i
938 -1.4377-0.3091i
939 -1.2232-0.3091i
940 -0.9302-0.2868i
941 -1.0579-0.2868i
942 -0.9302-0.3091i
943 -1.0579-0.3091i
944 -0.5505-0.4471i
945 -0.6150-0.4471i
946 -0.5505-0.4043i
947 -0.6150-0.4043i
948 -0.8066-0.4471i
949 -0.7158-0.4471i
950 -0.8066-0.4043i
951 -0.7158-0.4043i
952 -0.5505-0.2868i
953 -0.6150-0.2868i
954 -0.5505-0.3091i
955 -0.6150-0.3091i
956 -0.8066-0.2868i
957 -0.7158-0.2868i
958 -0.8066-0.3091i
[0072]
959 -0.7158-0.3091i
960 -0.0596-0.0596i
961 -0.0642-0.0596i
962 -0.0596-0.0642i
963 -0.0642-0.0642i
964 -0.1766-0.0596i
965 -0.1669-0.0596i
966 -0.1766-0.0642i
967 -0.1669-0.0642i
968 -0.0596-0.1766i
969 -0.0642-0.1766i
970 -0.0596-0.1669i
971 -0.0642-0.1669i
972 -0.1766-0.1766i
973 -0.1669-0.1766i
974 -0.1766-0.1669i
975 -0.1669-0.1669i
976 -0.4471-0.0596i
977 -0.4043-0.0596i
978 -0.4471-0.0642i
979 -0.4043-0.0642i
980 -0.2868-0.0596i
[0073]
981 -0.3091-0.0596i
982 -0.2868-0.0642i
983 -0.3091-0.0642i
984 -0.4471-0.1766i
985 -0.4043-0.1766i
986 -0.4471-0.1669i
987 -0.4043-0.1669i
988 -0.2868-0.1766i
989 -0.3091-0.1766i
990 -0.2868-0.1669i
991 -0.3091-0.1669i
992 -0.0596-0.4471i
993 -0.0642-0.4471i
994 -0.0596-0.4043i
995 -0.0642-0.4043i
996 -0.1766-0.4471i
997 -0.1669-0.4471i
998 -0.1766-0.4043i
999 -0.1669-0.4043i
1000 -0.0596-0.2868i
1001 -0.0642-0.2868i
1002 -0.0596-0.3091i
[0074]
1003 -0.0642-0.3091i
1004 -0.1766-0.2868i
1005 -0.1669-0.2868i
1006 -0.1766-0.3091i
1007 -0.1669-0.3091i
1008 -0.4471-0.4471i
1009 -0.4043-0.4471i
1010 -0.4471-0.4043i
1011 -0.4043-0.4043i
1012 -0.2868-0.4471i
1013 -0.3091-0.4471i
1014 -0.2868-0.4043i
1015 -0.3091-0.4043i
1016 -0.4471-0.2868i
1017 -0.4043-0.2868i
1018 -0.4471-0.3091i
1019 -0.4043-0.3091i
1020 -0.2868-0.2868i
1021 -0.3091-0.2868i
1022 -0.2868-0.3091i
1023 -0.3091-0.3091i
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 5760 bit, totally 10 row.
Afterwards to the bitstream data (b after above-mentioned Bit Interleave 0, b 1..., b n-1), according to 1024QAM planisphere, the decimal number corresponding to every ten binary bit sequence is mapped to some constellation point, obtains symbol stream (the corresponding constellation point of each complex symbol).Such as, ten corresponding decimal numbers of bit ' 0000001101 ' of input are 13, then correspond to the constellation point of the 1.0579+0.9302i in 1024QAM planisphere, this constellation point being shown as on real number axis and axis of imaginaries, real number axis 1.0579, axis of imaginaries 0.9302.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 2/3N ldpc=57600, L × L=320 × 320, Q=60, M=19200
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 check bit P=(p 0, p 1..., p m-1).Namely the code word Λ=(λ of N number of bit is obtained 0, λ 1..., λ n-1), wherein N=K+M.Λ can be expressed as again, Λ=(s 0, s 1..., s k-1, p 0, p 1..., p m-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
2) to information bit λ 0, to the verification ratio being address with the first row numeral in code table
Spy adds up, and lift table 1 code check 2/3, the code table of code length 57600 is example:
p 49 = p 49 ⊕ λ 0 , p 426 = p 426 ⊕ λ 0 , p 965 = p 965 ⊕ λ 0 , . . . . . . , p 18516 = p 18516 ⊕ λ 0 , p 18796 = p 18796 ⊕ 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＝{x+(mmod320)×Q}modM
Wherein, x refers to and λ 0relevant check digit address, act table 1 is example, the numeral of the first row in x and code table:
494269651357186145294580509852105713577560596325681869347032722381918534869787569791105881103411102123531303914661148011513015652157421628717708182281851618796
And wherein m is the quantity of check bit, and be also the quantity that check matrix is capable, L is the size of sub-block in check matrix, is generally 320.
Code word for table 1 is example,
Q = M L = 19200 320 = 60 .
p 109 = p 109 ⊕ λ 1 , p 486 = p 486 ⊕ λ 1 , p 1025 = p 1025 ⊕ λ 1 , . . . . . . , p 18576 = p 18576 ⊕ λ 1 , p 18856 = p 18856 ⊕ λ 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 L information bit λ lan ensuing L-1 information bit, continues 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=1,2,3 ..., M-1.
The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word.As shown in 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 21.54, and the thresholding under rayleigh fading channel reaches 24.54, 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 2/3;
Code table is:
Corresponding bit exchange pattern is: 34,188,191,727,819,153,101,621,463,571,277,365,171,126,706,116,993,176,507 41,118,111,101,431,741,313,137,842,615,122,127,431,171,514,031,561,642,116 76,511,023,229,874,617,998,150,334,915,215,989,138,671,144,016,516,461,081 04,837,178,921,201,392,816,012,811,568,141,174,812,112,416,724,969,079,307 21,331,736,910,501,182,055,103,135,991,071,129,197,311,701,291,255,255,794 25,168,851,633,912,238,132,608,014,635,615,812,310,666,419,515,317,782,441 75,119,546,211,315,747,142,771,454,515,413,010,013,721,475,881,441,091,016 41348614713614936148155161235821259166
Corresponding planisphere is:
Constellation point Complex symbol 0 1.4377+1.4377i 1 1.2232+1.4377i 2 1.4377+1.2232i 3 1.2232+1.2232i 4 0.9302+1.4377i 5 1.0579+1.4377i 6 0.9302+1.2232i 7 1.0579+1.2232i 8 1.4377+0.9302i
9 1.2232+0.9302i 10 1.4377+1.0579i 11 1.2232+1.0579i 12 0.9302+0.9302i 13 1.0579+0.9302i 14 0.9302+1.0579i 15 1.0579+1.0579i 16 0.5505+1.4377i 17 0.6150+1.4377i 18 0.5505+1.2232i 19 0.6150+1.2232i 20 0.8066+1.4377i 21 0.7158+1.4377i 22 0.8066+1.2232i 23 0.7158+1.2232i 24 0.5505+0.9302i 25 0.6150+0.9302i 26 0.5505+1.0579i 27 0.6150+1.0579i 28 0.8066+0.9302i 29 0.7158+0.9302i
30 0.8066+1.0579i 31 0.7158+1.0579i 32 1.4377+0.5505i 33 1.2232+0.5505i 34 1.4377+0.6150i 35 1.2232+0.6150i 36 0.9302+0.5505i 37 1.0579+0.5505i 38 0.9302+0.6150i 39 1.0579+0.6150i 40 1.4377+0.8066i 41 1.2232+0.8066i 42 1.4377+0.7158i 43 1.2232+0.7158i 44 0.9302+0.8066i 45 1.0579+0.8066i 46 0.9302+0.7158i 47 1.0579+0.7158i 48 0.5505+0.5505i 49 0.6150+0.5505i 50 0.5505+0.6150i
51 0.6150+0.6150i 52 0.8066+0.5505i 53 0.7158+0.5505i 54 0.8066+0.6150i 55 0.7158+0.6150i 56 0.5505+0.8066i 57 0.6150+0.8066i 58 0.5505+0.7158i 59 0.6150+0.7158i 60 0.8066+0.8066i 61 0.7158+0.8066i 62 0.8066+0.7158i 63 0.7158+0.7158i 64 0.0596+1.4377i 65 0.0642+1.4377i 66 0.0596+1.2232i 67 0.0642+1.2232i 68 0.1766+1.4377i 69 0.1669+1.4377i 70 0.1766+1.2232i 71 0.1669+1.2232i
72 0.0596+0.9302i 73 0.0642+0.9302i 74 0.0596+1.0579i 75 0.0642+1.0579i 76 0.1766+0.9302i 77 0.1669+0.9302i 78 0.1766+1.0579i 79 0.1669+1.0579i 80 0.4471+1.4377i 81 0.4043+1.4377i 82 0.4471+1.2232i 83 0.4043+1.2232i 84 0.2868+1.4377i 85 0.3091+1.4377i 86 0.2868+1.2232i 87 0.3091+1.2232i 88 0.4471+0.9302i 89 0.4043+0.9302i 90 0.4471+1.0579i 91 0.4043+1.0579i 92 0.2868+0.9302i
93 0.3091+0.9302i 94 0.2868+1.0579i 95 0.3091+1.0579i 96 0.0596+0.5505i 97 0.0642+0.5505i 98 0.0596+0.6150i 99 0.0642+0.6150i 100 0.1766+0.5505i 101 0.1669+0.5505i 102 0.1766+0.6150i 103 0.1669+0.6150i 104 0.0596+0.8066i 105 0.0642+0.8066i 106 0.0596+0.7158i 107 0.0642+0.7158i 108 0.1766+0.8066i 109 0.1669+0.8066i 110 0.1766+0.7158i 111 0.1669+0.7158i 112 0.4471+0.5505i 113 0.4043+0.5505i
114 0.4471+0.6150i 115 0.4043+0.6150i 116 0.2868+0.5505i 117 0.3091+0.5505i 118 0.2868+0.6150i 119 0.3091+0.6150i 120 0.4471+0.8066i 121 0.4043+0.8066i 122 0.4471+0.7158i 123 0.4043+0.7158i 124 0.2868+0.8066i 125 0.3091+0.8066i 126 0.2868+0.7158i 127 0.3091+0.7158i 128 1.4377+0.0596i 129 1.2232+0.0596i 130 1.4377+0.0642i 131 1.2232+0.0642i 132 0.9302+0.0596i 133 1.0579+0.0596i 134 0.9302+0.0642i
135 1.0579+0.0642i 136 1.4377+0.1766i 137 1.2232+0.1766i 138 1.4377+0.1669i 139 1.2232+0.1669i 140 0.9302+0.1766i 141 1.0579+0.1766i 142 0.9302+0.1669i 143 1.0579+0.1669i 144 0.5505+0.0596i 145 0.6150+0.0596i 146 0.5505+0.0642i 147 0.6150+0.0642i 148 0.8066+0.0596i 149 0.7158+0.0596i 150 0.8066+0.0642i 151 0.7158+0.0642i 152 0.5505+0.1766i 153 0.6150+0.1766i 154 0.5505+0.1669i 155 0.6150+0.1669i
156 0.8066+0.1766i 157 0.7158+0.1766i 158 0.8066+0.1669i 159 0.7158+0.1669i 160 1.4377+0.4471i 161 1.2232+0.4471i 162 1.4377+0.4043i 163 1.2232+0.4043i 164 0.9302+0.4471i 165 1.0579+0.4471i 166 0.9302+0.4043i 167 1.0579+0.4043i 168 1.4377+0.2868i 169 1.2232+0.2868i 170 1.4377+0.3091i 171 1.2232+0.3091i 172 0.9302+0.2868i 173 1.0579+0.2868i 174 0.9302+0.3091i 175 1.0579+0.3091i 176 0.5505+0.4471i
177 0.6150+0.4471i 178 0.5505+0.4043i 179 0.6150+0.4043i 180 0.8066+0.4471i 181 0.7158+0.4471i 182 0.8066+0.4043i 183 0.7158+0.4043i 184 0.5505+0.2868i 185 0.6150+0.2868i 186 0.5505+0.3091i 187 0.6150+0.3091i 188 0.8066+0.2868i 189 0.7158+0.2868i 190 0.8066+0.3091i 191 0.7158+0.3091i 192 0.0596+0.0596i 193 0.0642+0.0596i 194 0.0596+0.0642i 195 0.0642+0.0642i 196 0.1766+0.0596i 197 0.1669+0.0596i
198 0.1766+0.0642i 199 0.1669+0.0642i 200 0.0596+0.1766i 201 0.0642+0.1766i 202 0.0596+0.1669i 203 0.0642+0.1669i 204 0.1766+0.1766i 205 0.1669+0.1766i 206 0.1766+0.1669i 207 0.1669+0.1669i 208 0.4471+0.0596i 209 0.4043+0.0596i 210 0.4471+0.0642i 211 0.4043+0.0642i 212 0.2868+0.0596i 213 0.3091+0.0596i 214 0.2868+0.0642i 215 0.3091+0.0642i 216 0.4471+0.1766i 217 0.4043+0.1766i 218 0.4471+0.1669i
219 0.4043+0.1669i 220 0.2868+0.1766i 221 0.3091+0.1766i 222 0.2868+0.1669i 223 0.3091+0.1669i 224 0.0596+0.4471i 225 0.0642+0.4471i 226 0.0596+0.4043i 227 0.0642+0.4043i 228 0.1766+0.4471i 229 0.1669+0.4471i 230 0.1766+0.4043i 231 0.1669+0.4043i 232 0.0596+0.2868i 233 0.0642+0.2868i 234 0.0596+0.3091i 235 0.0642+0.3091i 236 0.1766+0.2868i 237 0.1669+0.2868i 238 0.1766+0.3091i 239 0.1669+0.3091i
240 0.4471+0.4471i 241 0.4043+0.4471i 242 0.4471+0.4043i 243 0.4043+0.4043i 244 0.2868+0.4471i 245 0.3091+0.4471i 246 0.2868+0.4043i 247 0.3091+0.4043i 248 0.4471+0.2868i 249 0.4043+0.2868i 250 0.4471+0.3091i 251 0.4043+0.3091i 252 0.2868+0.2868i 253 0.3091+0.2868i 254 0.2868+0.3091i 255 0.3091+0.3091i 256 -1.4377+1.4377i 257 -1.2232+1.4377i 258 -1.4377+1.2232i 259 -1.2232+1.2232i 260 -0.9302+1.4377i
261 -1.0579+1.4377i 262 -0.9302+1.2232i 263 -1.0579+1.2232i 264 -1.4377+0.9302i 265 -1.2232+0.9302i 266 -1.4377+1.0579i 267 -1.2232+1.0579i 268 -0.9302+0.9302i 269 -1.0579+0.9302i 270 -0.9302+1.0579i 271 -1.0579+1.0579i 272 -0.5505+1.4377i 273 -0.6150+1.4377i 274 -0.5505+1.2232i 275 -0.6150+1.2232i 276 -0.8066+1.4377i 277 -0.7158+1.4377i 278 -0.8066+1.2232i 279 -0.7158+1.2232i 280 -0.5505+0.9302i 281 -0.6150+0.9302i
282 -0.5505+1.0579i 283 -0.6150+1.0579i 284 -0.8066+0.9302i 285 -0.7158+0.9302i 286 -0.8066+1.0579i 287 -0.7158+1.0579i 288 -1.4377+0.5505i 289 -1.2232+0.5505i 290 -1.4377+0.6150i 291 -1.2232+0.6150i 292 -0.9302+0.5505i 293 -1.0579+0.5505i 294 -0.9302+0.6150i 295 -1.0579+0.6150i 296 -1.4377+0.8066i 297 -1.2232+0.8066i 298 -1.4377+0.7158i 299 -1.2232+0.7158i 300 -0.9302+0.8066i 301 -1.0579+0.8066i 302 -0.9302+0.7158i
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954 -0.5505-0.3091i 955 -0.6150-0.3091i 956 -0.8066-0.2868i 957 -0.7158-0.2868i 958 -0.8066-0.3091i 959 -0.7158-0.3091i 960 -0.0596-0.0596i 961 -0.0642-0.0596i 962 -0.0596-0.0642i 963 -0.0642-0.0642i 964 -0.1766-0.0596i 965 -0.1669-0.0596i 966 -0.1766-0.0642i 967 -0.1669-0.0642i 968 -0.0596-0.1766i 969 -0.0642-0.1766i 970 -0.0596-0.1669i 971 -0.0642-0.1669i 972 -0.1766-0.1766i 973 -0.1669-0.1766i 974 -0.1766-0.1669i
975 -0.1669-0.1669i 976 -0.4471-0.0596i 977 -0.4043-0.0596i 978 -0.4471-0.0642i 979 -0.4043-0.0642i 980 -0.2868-0.0596i 981 -0.3091-0.0596i 982 -0.2868-0.0642i 983 -0.3091-0.0642i 984 -0.4471-0.1766i 985 -0.4043-0.1766i 986 -0.4471-0.1669i 987 -0.4043-0.1669i 988 -0.2868-0.1766i 989 -0.3091-0.1766i 990 -0.2868-0.1669i 991 -0.3091-0.1669i 992 -0.0596-0.4471i 993 -0.0642-0.4471i 994 -0.0596-0.4043i 995 -0.0642-0.4043i
996 -0.1766-0.4471i 997 -0.1669-0.4471i 998 -0.1766-0.4043i 999 -0.1669-0.4043i 1000 -0.0596-0.2868i 1001 -0.0642-0.2868i 1002 -0.0596-0.3091i 1003 -0.0642-0.3091i 1004 -0.1766-0.2868i 1005 -0.1669-0.2868i 1006 -0.1766-0.3091i 1007 -0.1669-0.3091i 1008 -0.4471-0.4471i 1009 -0.4043-0.4471i 1010 -0.4471-0.4043i 1011 -0.4043-0.4043i 1012 -0.2868-0.4471i 1013 -0.3091-0.4471i 1014 -0.2868-0.4043i 1015 -0.3091-0.4043i 1016 -0.4471-0.2868i
1017 -0.4043-0.2868i 1018 -0.4471-0.3091i 1019 -0.4043-0.3091i 1020 -0.2868-0.2868i 1021 -0.3091-0.2868i 1022 -0.2868-0.3091i 1023 -0.3091-0.3091i
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 10 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 10 row, obtains third time than the bit soft value data after deinterleave.
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