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CN105450333A - Ldpc码字的交织映射方法及解交织解映射方法 - Google Patents

Ldpc码字的交织映射方法及解交织解映射方法 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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Prior art keywords
bit
ldpc code
time
code word
value data
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Inventor
张文军
赵杰
史毅俊
徐胤
徐洪亮
何大治
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Priority to CN201410409149.5A priority Critical patent/CN105450333A/zh
Priority to CN201710408189.1A priority patent/CN107204828A/zh
Publication of CN105450333A publication Critical patent/CN105450333A/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Error Detection And Correction (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

一种LDPC码字的交织映射方法及解交织解映射方法，包括将LDPC码字中的校验部分进行第一次比特交织得到校验比特流；将LDPC码字中的信息比特部分与校验比特流拼接成第一次比特交织后的LDPC码字；将第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块按相应的比特交换图案变换比特子块的排列顺序形成第二次比特交织后的LDPC码字；将第二次比特交织后的LDPC码字按列顺序写入并按行顺序读出得到第三次比特交织后的LDPC码字；对第三次比特交织后的LDPC码字依照星座图进行星座映射以得到符号流。针对不同的LDPC码表选择交织映射和解交织解映射方法使系统性能得到更好的提升。

Description

LDPC码字的交织映射方法及解交织解映射方法
技术领域
本发明涉及数字电视技术领域，特别涉及一种LDPC码字的交织和映射方法及解交织解映射方法。
背景技术
在现有的广播通信标准中，LDPC编码、比特交织和星座映射是最为常见的编码调制方式。在不同的发射系统中，LDPC编码、比特交织和星座映射都需要单独设计，并且联合调试，以取得最好的信道性能。因此，如何针对特定的LDPC码字和星座映射方式形成针对性的比特交织，是本领域的一个技术难题。
发明内容
本发明解决的问题是现有技术中无法针对特定的LDPC码字和星座映射方式形成针对性的比特交织。
为解决上述问题，本发明实施例提供了一种LDPC码字的交织和映射方法，包括如下步骤：将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流；将所述LDPC码字中的信息比特部分与所述校验比特流拼接成第一次比特交织后的LDPC码字；将所述第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块，并按照相应的比特交换图案变换所述比特子块的排列顺序以形成第二次比特交织后的LDPC码字；将所述第二次比特交织后的LDPC码字按列顺序写入存储空间并按行顺序从该存储空间内读出以得到第三次比特交织后的LDPC码字；对所述第三次比特交织后的LDPC码字依照相应的星座图进行星座映射以得到符号流。
本发明实施例还提供了一种LDPC码字的解交织解映射方法，包括如下步骤：对符号流软值数据依照相应的星座图进行软解映射处理以得到比特软值数据；其中所述符号流软值数据是接收端接收到如上述的LDPC码字的交织映射方法得到的符号流；将所述比特软值数据按行顺序写入存储空间并按列顺序从该存储空间内读出以得到第一次比特解交织后的比特软值数据；将所述第一次比特解交织后的比特软值数据按预定长度分成连续的多个比特软值数据子块，并按照相应的比特交换图案变换所述比特软值数据子块的排列顺序以形成第二次比特解交织后的比特软值数据；将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据进行第三次比特解交织以得到第三次比特解交织后的比特软值数据；将所述第二次比特解交织后的比特软值数据中与所述第三次比特解交织后的比特软值数据拼接成比特软值数据流；对所述比特软值数据流进行LDPC译码处理以得到解码后的比特流数据。
与现有技术相比，本发明技术方案具有以下优点：
针对特定的LDPC码表选择相应的交织映射以及解交织解映射方法以使系统性能得到更好的提升。
附图说明
图1是本发明的一种LDPC码字的交织映射方法的具体实施方式的流程示意图；
图2是本发明的一种LDPC码字的解交织解映射方法的具体实施方式的流程示意图；
图3是本发明的一种LDPC码字的交织映射方法中对LDPC码字中的校验部分进行第一次比特交织以得到校验比特流的示意图；
图4是本发明的一种LDPC码字的交织映射方法中按照比特交换图案变换所述比特子块的排列顺序的示意图。
具体实施方式
发明人发现现有技术中，无法针对特定的LDPC码字和星座映射方式形成针对性的比特交织。
针对上述问题，发明人经过研究，提供了一种LDPC码字的交织映射方法及解交织解映射方法，针对不同的LDPC码表选择相应的交织映射以及解交织解映射方法以使系统性能得到更好的提升。
为使本发明的上述目的、特征和优点能够更为明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。
在本发明实施例中，发射机端为：首先将信源编码、BCH编码后的比特流输入到LDPC编码器进行特定码率码长的LDPC码字的编码，之后输入比特交织器，按照某种特定的比特交织图案方法进行交织处理，随后将比特交织处理后的数据进行对应码率的1024QAM星座映射，之后进行调制，发射，经历信道。接收机端为：将经过信道后的数据进行解调，然后解调后的数据输入解映射模块，进行1024QAM解映射。之后将解映射模块输出的比特软值信息输入到解交织模块进行解交织，之后输出到LDPC译码器，对其进行基于特定的LDPC码字的译码，最后解码输出比特流。
如图1所示的是本发明的一种LDPC码字的交织映射方法的具体实施方式的流程示意图。参考图1，LDPC码字的交织映射方法包括如下步骤：
步骤S11：将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流；
步骤S12：将所述LDPC码字中的信息比特部分与所述校验比特流拼接成第一次比特交织后的LDPC码字；
步骤S13：将所述第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块，并按照相应的比特交换图案变换所述比特子块的排列顺序以形成第二次比特交织后的LDPC码字；
步骤S14：将所述第二次比特交织后的LDPC码字按列顺序写入存储空间并按行顺序从该存储空间内读出以得到第三次比特交织后的LDPC码字；
步骤S15：对所述第三次比特交织后的LDPC码字依照相应的星座图进行星座映射以得到符号流。
在本实施例中，所述步骤S11具体包括如下步骤：将所述LDPC码字中的校验部分按列顺序写入存储空间并按行顺序从该存储空间内读出以得到校验比特流。
具体地，对生成LDPC码字的检验部分进行比特交织：LDPC码字的校验部分共M个比特，按列写到一个存储空间内，每列Q个比特，共L列，也就是说M=Q*L，接着按行顺序读出。其具体实施过程参考图3所示。
在所述步骤S13中，将所述第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块，其中所述预定长度为320。进一步地，按照相应的比特交换图案变换所述比特子块的排列顺序以形成第二次比特交织后的LDPC码字。其具体过程详见图4所示，在图4中，(m0,m1,...,mN/320-1)是320长度比特子块的比特交换图案。
具体地，LDPC码表中的LDPC码字的码长为57600,相应的比特交换图案为：3418819172781915310162146357127736517112670611699317650741118111101431741313137842615122127431171514031561642116765110232298746179981503349152159891386711440165164610810483717892120139281601281156814117481211241672496907930721331736910501182055103135991071129197311701291255255794251688516339122381326080146356158123106664195153177824417511954621131574714277145451541301001372147588144109101641348614713614936148155161235821259166
需要说明的是，在本实施例中，所述比特交换图案中的各个数值是指未经过比特交换前所述比特子块的位置。例如，上述比特交换图案中的第二个数值18含义是指原来未经过比特交换前第19个比特子块的如今经过比特交换后变成了第二个比特子块。
相应的星座图为：
星座点 复数符号
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
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[0040]
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[0041]
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[0042]
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[0043]
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[0044]
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[0045]
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[0046]
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[0048]
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[0049]
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[0050]
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[0051]
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[0052]
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[0053]
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[0054]
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[0055]
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[0056]
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[0057]
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[0058]
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[0059]
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[0060]
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[0061]
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[0062]
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[0063]
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[0064]
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[0065]
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在所述步骤S14中，例如，对于码长为57600比特的LDPC码字(经第二次比特交织后的LDPC码字)，将其按列顺序写入存储空间并按行顺序从该存储空间内读出，其中每列5760比特，共10列。
之后对上述比特交织后的比特流数据(b0,b1,...,bN-1)，根据1024QAM星座图，每十个二进制比特序列所对应的十进制数映射到某一个星座点，得到符号流(每个复数符号对应一个星座点)。例如，输入的十个比特‘0000001101’对应十进制数为13，则对应到1024QAM星座图中的1.0579+0.9302i的星座点，该星座点在实数轴和虚数轴上的显示为，实数轴1.0579、虚数轴0.9302。然后在调制模块利用符号流进行生成OFDM符号，最后发射。
在本实施例中，所述LDPC码字是对信源编码后的比特流经特定的LDPC编码后得到，其中所述特定的LDPC编码可以采用现有技术来实现。
具体地，该LDPC的码字以L×L(L通常为320)为子块大小，码表如下：
表1码率2/3Nldpc＝57600,L×L＝320×320,Q＝60,M＝19200
其编码方法如下：
将信源编码后的比特流，拆分为一个个信息块，每个信息块由K个信息比特组成，表示为S＝(s0,s1,...,sK-1)。按图1中的特定LDPC编码，是要根据S＝(s0,s1,...,sK-1)生成M个校验比特P＝(p0,p1,...,pM-1)。即得到N个比特的码字Λ＝(λ0,λ1,...,λN-1)，其中N＝K+M。Λ又可以表示为，Λ＝(s0,s1,...,sK-1,p0,p1,...,pM-1)。
编码的步骤为：
1)初始化λi＝si，i＝0,1,...,K-1。pj＝0，j＝0,1,...,M-1
2)对信息比特λ0，对以码表中的第一行数字为地址的校验比
特进行累加，举表1码率2/3，码长57600的码表为例：
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)对于接下来的L-1个信息比特，(通常L＝320)，λm,m＝1,2,....,L-1，将每个信息比特分别与按照如下y为地址的校验比特进行累加：
y＝{x+(mmod320)×Q}modM
其中，x是指与λ0相关的校验位地址，举表1为例，x即码表中第一行的数字：
494269651357186145294580509852105713577560596325681869347032722381918534869787569791105881103411102123531303914661148011513015652157421628717708182281851618796
而其中M是校验比特的数量，也是校验矩阵行的数量，L是校验矩阵中子块的大小，通常为320.
举表1的码字为例子，
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)对于第L个信息比特λL，按照码表中的第二行数字地址对校验比特进行累加。同样的对于第L个信息比特λL接下来的L-1个信息比特，继续按照步骤3)中的公式对校验比特进行累加，这时候步骤三种的公式的x即码表中第二行的数字。
5)同理，对于第2L、3L、4L…iL…个信息比特，按照码表中分别第3、4、5、…、(i+1)L....行的地址对校验比特进行累加，而其信息比特之后的L-1个信息比特则分别按照步骤3)中的公式对校验比特进行累加，注意这时候步骤三种的公式的x对应的是当前第iL个信息比特所对应的码表中的行，比如第iL个信息比特之后的L-1个比特，其应用步骤3)中的公式的时候对应的x的地址为码表中的第(i+1)行。
6)做完步骤5)之后，做如下操作：
其中i＝1,2,3,……，M-1。
本发明实施例还提供了一种LDPC码字的解交织解映射方法。如图2所示的是本发明的一种LDPC码字的解交织解映射方法的具体实施方式的流程示意图。参考图2，LDPC码字的解交织解映射方法包括如下步骤：
步骤S21：对符号流软值数据依照相应的星座图进行软解映射处理以得到比特软值数据；
步骤S22：将所述比特软值数据按行顺序写入存储空间并按列顺序从该存储空间内读出以得到第一次比特解交织后的比特软值数据；
步骤S23：将所述第一次比特解交织后的比特软值数据按预定长度分成连续的多个比特软值数据子块，并按照相应的比特交换图案变换所述比特软值数据子块的排列顺序以形成第二次比特解交织后的比特软值数据；
步骤S24：将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据进行第三次比特解交织以得到第三次比特解交织后的比特软值数据；
步骤S25：将所述第二次比特解交织后的比特软值数据中与所述第三次比特解交织后的比特软值数据拼接成比特软值数据流；
步骤S26：对所述比特软值数据流进行LDPC译码处理以得到解码后的比特流数据。
在本实施例中，所述步骤S24具体包括：将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据按行顺序写入存储空间并按列顺序从该存储空间内读出以得到第三次比特解交织后的比特软值数据。
通过上述的LDPC的编码、交织及调制方式，可以使系统在AWGN信道下的门限达到21.54，在瑞利衰落信道下的门限达到24.54，可以有效地增加覆盖率。
本发明虽然已以较佳实施例公开如上，但其并不是用来限定本发明，任何本领域技术人员在不脱离本发明的精神和范围内，都可以利用上述揭示的方法和技术内容对本发明技术方案做出可能的变动和修改，因此，凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化及修饰，均属于本发明技术方案的保护范围。

Claims (7)

1.一种LDPC码字的交织映射方法，其特征在于，包括如下步骤：
将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流；
将所述LDPC码字中的信息比特部分与所述校验比特流拼接成第一次比特交织后的LDPC码字；
将所述第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块，并按照相应的比特交换图案变换所述比特子块的排列顺序以形成第二次比特交织后的LDPC码字；
将所述第二次比特交织后的LDPC码字按列顺序写入存储空间并按行顺序从该存储空间内读出，得到第三次比特交织后的LDPC码字；
对所述第三次比特交织后的LDPC码字依照相应的星座图进行星座映射以得到符号流；其中，所述比特交换图案和所述星座图都与不同码率的LDPC码表相对应。
2.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流包括：
将所述LDPC码字中的校验部分按列顺序写入存储空间并按行顺序从该存储空间内读出以得到校验比特流。
3.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，所述预定长度为320比特。
4.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，
所述LDPC码表中LDPC码字的码长为57600比特、码率为2/3；
码表为：
相应的比特交换图案为：3418819172781915310162146357127736517112670611699317650741118111101431741313137842615122127431171514031561642116765110232298746179981503349152159891386711440165164610810483717892120139281601281156814117481211241672496907930721331736910501182055103135991071129197311701291255255794251688516339122381326080146356158123106664195153177824417511954621131574714277145451541301001372147588144109101641348614713614936148155161235821259166
相应的星座图为：
星座点 复数符号 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
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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
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5.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，所述按列顺序的数目为10列。
6.一种LDPC码字的解交织解映射方法，其特征在于，包括如下步骤：
对符号流软值数据依照相应的星座图进行软解映射处理以得到比特软值数据；其中所述符号流软值数据是接收端接收到如权利要求1所述的LDPC码字的交织映射方法得到的符号流；
将所述比特软值数据按行顺序写入存储空间并按列顺序从该存储空间内读出以得到第一次比特解交织后的比特软值数据；
将所述第一次比特解交织后的比特软值数据按预定长度分成连续的多个比特软值数据子块，并按照相应的比特交换图案变换所述比特软值数据子块的排列顺序以形成第二次比特解交织后的比特软值数据；
将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据进行第三次比特解交织以得到第三次比特解交织后的比特软值数据；
将所述第二次比特解交织后的比特软值数据中与所述第三次比特解交织后的比特软值数据拼接成比特软值数据流；
对所述比特软值数据流进行LDPC译码处理以得到解码后的比特流数据。
7.如权利要求6所述的LDPC码字的解交织解映射方法，其特征在于，所述将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据进行第三次比特解交织以得到第三次比特解交织后的比特软值数据包括：
将所述第二次比特解交织后的比特软值数据中对应于LDPC码字中的校验部分的比特软值数据按行顺序写入存储空间并按列顺序从该存储空间内读出，所述按行写入并按列顺序读出的列数为10列，得到第三次比特解交织后的比特软值数据。
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