CN104935399A - 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 PDFInfo
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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
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;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。
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经过快速傅里叶变换后得到;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。
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:首先将信源编码后比特流输入到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1024NUC星座映射,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QPSK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码字都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;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。
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q列,也就是说M=Q*q,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360。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/360-1)是360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64800。针对不同码率的LDPC码字,提供不同的比特交换图案。
在本实施例中,针对码率6/15Nldpc=64800q×q=360×360,Q=108。码表为:
相应的比特交换图案为:
94341205122669239119170581672595307811299215106153
1218159139466974548861211148113379146271714080110
4379410402137131536908616831116708915410514433152
16362161311266313313577531601581914338124601554911169142
102412911832552610841761652967177127136859317910713891
7516617465103176175173100644782128157151164162717110187141
17828961614245203351721501307112314981109595213213461
727340122489711028414798117238344148115156145650145
1255711168
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一个数值94含义是指原来未经过比特交换前第95个比特子块的如今经过比特交换后变成了第一个比特子块。
相应的星座图为:
星座点 | 星座符号 |
0 | 1.5031+1.5031i |
1 | 1.5031+1.2286i |
2 | 1.2286+1.5031i |
3 | 1.2286+1.2286i |
4 | 1.5031+0.9418i |
5 | 1.5031+1.0048i |
6 | 1.2286+0.9418i |
7 | 1.2286+1.0048i |
8 | 0.9418+1.5031i |
9 | 0.9418+1.2286i |
10 | 1.0048+1.5031i |
11 | 1.0048+1.2286i |
12 | 0.9418+0.9418i |
13 | 0.9418+1.0048i |
14 | 1.0048+0.9418i |
15 | 1.0048+1.0048i |
16 | 1.5031+0.6097i |
17 | 1.5031+0.6072i |
18 | 1.2286+0.6097i |
19 | 1.2286+0.6072i |
20 | 1.5031+0.7196i |
21 | 1.5031+0.7113i |
22 | 1.2286+0.7196i |
23 | 1.2286+0.7113i |
24 | 0.9418+0.6097i |
25 | 0.9418+0.6072i |
26 | 1.0048+0.6097i |
27 | 1.0048+0.6072i |
28 | 0.9418+0.7196i |
29 | 0.9418+0.7113i |
30 | 1.0048+0.7196i |
31 | 1.0048+0.7113i |
32 | 0.6097+1.5031i |
33 | 0.6097+1.2286i |
34 | 0.6072+1.5031i |
35 | 0.6072+1.2286i |
36 | 0.6097+0.9418i |
37 | 0.6097+1.0048i |
38 | 0.6072+0.9418i |
39 | 0.6072+1.0048i |
40 | 0.7196+1.5031i |
41 | 0.7196+1.2286i |
42 | 0.7113+1.5031i |
43 | 0.7113+1.2286i |
44 | 0.7196+0.9418i |
45 | 0.7196+1.0048i |
46 | 0.7113+0.9418i |
47 | 0.7113+1.0048i |
48 | 0.6097+0.6097i |
49 | 0.6097+0.6072i |
50 | 0.6072+0.6097i |
51 | 0.6072+0.6072i |
52 | 0.6097+0.7196i |
53 | 0.6097+0.7113i |
54 | 0.6072+0.7196i |
55 | 0.6072+0.7113i |
56 | 0.7196+0.6097i |
57 | 0.7196+0.6072i |
58 | 0.7113+0.6097i |
59 | 0.7113+0.6072i |
60 | 0.7196+0.7196i |
61 | 0.7196+0.7113i |
62 | 0.7113+0.7196i |
63 | 0.7113+0.7113i |
64 | 1.5031+0.1275i |
65 | 1.5031+0.1276i |
66 | 1.2286+0.1275i |
67 | 1.2286+0.1276i |
68 | 1.5031+0.1295i |
69 | 1.5031+0.1294i |
70 | 1.2286+0.1295i |
71 | 1.2286+0.1294i |
72 | 0.9418+0.1275i |
73 | 0.9418+0.1276i |
74 | 1.0048+0.1275i |
75 | 1.0048+0.1276i |
76 | 0.9418+0.1295i |
77 | 0.9418+0.1294i |
78 | 1.0048+0.1295i |
79 | 1.0048+0.1294i |
80 | 1.5031+0.3666i |
81 | 1.5031+0.3675i |
82 | 1.2286+0.3666i |
83 | 1.2286+0.3675i |
84 | 1.5031+0.3424i |
85 | 1.5031+0.3431i |
86 | 1.2286+0.3424i |
87 | 1.2286+0.3431i |
88 | 0.9418+0.3666i |
89 | 0.9418+0.3675i |
90 | 1.0048+0.3666i |
91 | 1.0048+0.3675i |
92 | 0.9418+0.3424i |
93 | 0.9418+0.3431i |
94 | 1.0048+0.3424i |
95 | 1.0048+0.3431i |
96 | 0.6097+0.1275i |
97 | 0.6097+0.1276i |
98 | 0.6072+0.1275i |
99 | 0.6072+0.1276i |
100 | 0.6097+0.1295i |
101 | 0.6097+0.1294i |
102 | 0.6072+0.1295i |
103 | 0.6072+0.1294i |
104 | 0.7196+0.1275i |
105 | 0.7196+0.1276i |
106 | 0.7113+0.1275i |
107 | 0.7113+0.1276i |
108 | 0.7196+0.1295i |
109 | 0.7196+0.1294i |
110 | 0.7113+0.1295i |
111 | 0.7113+0.1294i |
112 | 0.6097+0.3666i |
113 | 0.6097+0.3675i |
114 | 0.6072+0.3666i |
115 | 0.6072+0.3675i |
116 | 0.6097+0.3424i |
117 | 0.6097+0.3431i |
118 | 0.6072+0.3424i |
119 | 0.6072+0.3431i |
120 | 0.7196+0.3666i |
121 | 0.7196+0.3675i |
122 | 0.7113+0.3666i |
123 | 0.7113+0.3675i |
124 | 0.7196+0.3424i |
125 | 0.7196+0.3431i |
126 | 0.7113+0.3424i |
127 | 0.7113+0.3431i |
128 | 0.1275+1.5031i |
129 | 0.1275+1.2286i |
130 | 0.1276+1.5031i |
131 | 0.1276+1.2286i |
132 | 0.1275+0.9418i |
133 | 0.1275+1.0048i |
134 | 0.1276+0.9418i |
135 | 0.1276+1.0048i |
136 | 0.1295+1.5031i |
137 | 0.1295+1.2286i |
138 | 0.1294+1.5031i |
139 | 0.1294+1.2286i |
140 | 0.1295+0.9418i |
141 | 0.1295+1.0048i |
142 | 0.1294+0.9418i |
143 | 0.1294+1.0048i |
144 | 0.1275+0.6097i |
145 | 0.1275+0.6072i |
146 | 0.1276+0.6097i |
147 | 0.1276+0.6072i |
148 | 0.1275+0.7196i |
149 | 0.1275+0.7113i |
150 | 0.1276+0.7196i |
151 | 0.1276+0.7113i |
152 | 0.1295+0.6097i |
153 | 0.1295+0.6072i |
154 | 0.1294+0.6097i |
155 | 0.1294+0.6072i |
156 | 0.1295+0.7196i |
157 | 0.1295+0.7113i |
158 | 0.1294+0.7196i |
159 | 0.1294+0.7113i |
160 | 0.3666+1.5031i |
161 | 0.3666+1.2286i |
162 | 0.3675+1.5031i |
163 | 0.3675+1.2286i |
164 | 0.3666+0.9418i |
165 | 0.3666+1.0048i |
166 | 0.3675+0.9418i |
167 | 0.3675+1.0048i |
168 | 0.3424+1.5031i |
169 | 0.3424+1.2286i |
170 | 0.3431+1.5031i |
171 | 0.3431+1.2286i |
172 | 0.3424+0.9418i |
173 | 0.3424+1.0048i |
174 | 0.3431+0.9418i |
175 | 0.3431+1.0048i |
176 | 0.3666+0.6097i |
177 | 0.3666+0.6072i |
178 | 0.3675+0.6097i |
179 | 0.3675+0.6072i |
180 | 0.3666+0.7196i |
181 | 0.3666+0.7113i |
182 | 0.3675+0.7196i |
183 | 0.3675+0.7113i |
184 | 0.3424+0.6097i |
185 | 0.3424+0.6072i |
186 | 0.3431+0.6097i |
187 | 0.3431+0.6072i |
188 | 0.3424+0.7196i |
189 | 0.3424+0.7113i |
190 | 0.3431+0.7196i |
191 | 0.3431+0.7113i |
192 | 0.1275+0.1275i |
193 | 0.1275+0.1276i |
194 | 0.1276+0.1275i |
195 | 0.1276+0.1276i |
196 | 0.1275+0.1295i |
197 | 0.1275+0.1294i |
198 | 0.1276+0.1295i |
199 | 0.1276+0.1294i |
200 | 0.1295+0.1275i |
201 | 0.1295+0.1276i |
202 | 0.1294+0.1275i |
203 | 0.1294+0.1276i |
204 | 0.1295+0.1295i |
205 | 0.1295+0.1294i |
206 | 0.1294+0.1295i |
207 | 0.1294+0.1294i |
208 | 0.1275+0.3666i |
209 | 0.1275+0.3675i |
210 | 0.1276+0.3666i |
211 | 0.1276+0.3675i |
212 | 0.1275+0.3424i |
213 | 0.1275+0.3431i |
214 | 0.1276+0.3424i |
215 | 0.1276+0.3431i |
216 | 0.1295+0.3666i |
217 | 0.1295+0.3675i |
218 | 0.1294+0.3666i |
219 | 0.1294+0.3675i |
220 | 0.1295+0.3424i |
221 | 0.1295+0.3431i |
222 | 0.1294+0.3424i |
223 | 0.1294+0.3431i |
224 | 0.3666+0.1275i |
225 | 0.3666+0.1276i |
226 | 0.3675+0.1275i |
227 | 0.3675+0.1276i |
228 | 0.3666+0.1295i |
229 | 0.3666+0.1294i |
230 | 0.3675+0.1295i |
231 | 0.3675+0.1294i |
232 | 0.3424+0.1275i |
233 | 0.3424+0.1276i |
234 | 0.3431+0.1275i |
235 | 0.3431+0.1276i |
236 | 0.3424+0.1295i |
237 | 0.3424+0.1294i |
238 | 0.3431+0.1295i |
239 | 0.3431+0.1294i |
240 | 0.3666+0.3666i |
241 | 0.3666+0.3675i |
242 | 0.3675+0.3666i |
243 | 0.3675+0.3675i |
244 | 0.3666+0.3424i |
245 | 0.3666+0.3431i |
246 | 0.3675+0.3424i |
247 | 0.3675+0.3431i |
248 | 0.3424+0.3666i |
249 | 0.3424+0.3675i |
250 | 0.3431+0.3666i |
251 | 0.3431+0.3675i |
252 | 0.3424+0.3424i |
253 | 0.3424+0.3431i |
254 | 0.3431+0.3424i |
255 | 0.3431+0.3431i |
256 | 1.5031-1.5031i |
257 | 1.5031-1.2286i |
258 | 1.2286-1.5031i |
259 | 1.2286-1.2286i |
260 | 1.5031-0.9418i |
261 | 1.5031-1.0048i |
262 | 1.2286-0.9418i |
263 | 1.2286-1.0048i |
264 | 0.9418-1.5031i |
265 | 0.9418-1.2286i |
266 | 1.0048-1.5031i |
267 | 1.0048-1.2286i |
268 | 0.9418-0.9418i |
269 | 0.9418-1.0048i |
270 | 1.0048-0.9418i |
271 | 1.0048-1.0048i |
272 | 1.5031-0.6097i |
273 | 1.5031-0.6072i |
274 | 1.2286-0.6097i |
275 | 1.2286-0.6072i |
276 | 1.5031-0.7196i |
277 | 1.5031-0.7113i |
278 | 1.2286-0.7196i |
279 | 1.2286-0.7113i |
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1021 | -0.3424-0.3431i |
1022 | -0.3431-0.3424i |
1023 | -0.3431-0.3431i |
LDPC码字的码长为64800比特、码率为8/15、Q=84码表为:
相应的比特交换图案为:
411376759949516716412532491405215686327753492141
431751183399544161051706621501369010457178108145110
53931133039692640135160117201278314712321095848127
1211810077129551259835111179741734270101118107453747
64132124621341151080761481241308417616310312012687151139
511461291381579115451692217161651667911673177461617277
2816210215611913361603115286114130361591221311531285644
381552397143112168658314215891069617485891917214815082
1498817144
相应的星座图为:
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0 | 1.4800+1.4800i |
1 | 1.4800+1.2281i |
2 | 1.2281+1.4800i |
3 | 1.2281+1.2281i |
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5 | 1.4800+1.0349i |
6 | 1.2281+0.9212i |
7 | 1.2281+1.0349i |
8 | 0.9212+1.4800i |
9 | 0.9212+1.2281i |
10 | 1.0349+1.4800i |
11 | 1.0349+1.2281i |
12 | 0.9212+0.9212i |
13 | 0.9212+1.0349i |
14 | 1.0349+0.9212i |
15 | 1.0349+1.0349i |
16 | 1.4800+0.5810i |
17 | 1.4800+0.5872i |
18 | 1.2281+0.5810i |
19 | 1.2281+0.5872i |
20 | 1.4800+0.7604i |
21 | 1.4800+0.7213i |
22 | 1.2281+0.7604i |
23 | 1.2281+0.7213i |
24 | 0.9212+0.5810i |
25 | 0.9212+0.5872i |
26 | 1.0349+0.5810i |
27 | 1.0349+0.5872i |
28 | 0.9212+0.7604i |
29 | 0.9212+0.7213i |
30 | 1.0349+0.7604i |
31 | 1.0349+0.7213i |
32 | 0.5810+1.4800i |
33 | 0.5810+1.2281i |
34 | 0.5872+1.4800i |
35 | 0.5872+1.2281i |
36 | 0.5810+0.9212i |
37 | 0.5810+1.0349i |
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42 | 0.7213+1.4800i |
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64 | 1.4800+0.0773i |
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128 | 0.0773+1.4800i |
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133 | 0.0773+1.0349i |
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143 | 0.1614+1.0349i |
144 | 0.0773+0.5810i |
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147 | 0.0773+0.5872i |
148 | 0.0773+0.7604i |
149 | 0.0773+0.7213i |
150 | 0.0773+0.7604i |
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152 | 0.1614+0.5810i |
153 | 0.1614+0.5872i |
154 | 0.1614+0.5810i |
155 | 0.1614+0.5872i |
156 | 0.1614+0.7604i |
157 | 0.1614+0.7213i |
158 | 0.1614+0.7604i |
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171 | 0.3085+1.2281i |
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186 | 0.3085+0.5810i |
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188 | 0.3086+0.7604i |
189 | 0.3086+0.7213i |
190 | 0.3085+0.7604i |
191 | 0.3085+0.7213i |
192 | 0.0773+0.0773i |
193 | 0.0773+0.0773i |
194 | 0.0773+0.0773i |
195 | 0.0773+0.0773i |
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197 | 0.0773+0.1614i |
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227 | 0.4159+0.0773i |
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253 | 0.3086+0.3085i |
254 | 0.3085+0.3086i |
255 | 0.3085+0.3085i |
256 | 1.4800-1.4800i |
257 | 1.4800-1.2281i |
258 | 1.2281-1.4800i |
259 | 1.2281-1.2281i |
260 | 1.4800-0.9212i |
261 | 1.4800-1.0349i |
262 | 1.2281-0.9212i |
263 | 1.2281-1.0349i |
264 | 0.9212-1.4800i |
265 | 0.9212-1.2281i |
266 | 1.0349-1.4800i |
267 | 1.0349-1.2281i |
268 | 0.9212-0.9212i |
269 | 0.9212-1.0349i |
270 | 1.0349-0.9212i |
271 | 1.0349-1.0349i |
272 | 1.4800-0.5810i |
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274 | 1.2281-0.5810i |
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276 | 1.4800-0.7604i |
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279 | 1.2281-0.7213i |
280 | 0.9212-0.5810i |
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999 | -0.4159-0.1614i |
1000 | -0.3086-0.0773i |
1001 | -0.3086-0.0773i |
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1003 | -0.3085-0.0773i |
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1005 | -0.3086-0.1614i |
1006 | -0.3085-0.1614i |
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1009 | -0.4163-0.4159i |
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1013 | -0.4163-0.3085i |
1014 | -0.4159-0.3086i |
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1019 | -0.3085-0.4159i |
1020 | -0.3086-0.3086i |
1021 | -0.3086-0.3085i |
1022 | -0.3085-0.3086i |
1023 | -0.3085-0.3085i |
LDPC码字的码长为64800比特、码率为9/15;
码表为:
相应的比特交换图案为:
1779132601081712385164801409561261121387615793304815
14815387114774018791431722916188421141056510713912754
43671662794831581011669881212434241121144507111549
152615273122383798926561595953681711561308981147104
78961351369923666313171692234212914417033146119
10316117821336251111102281791509210616013711901132014519
721731091688617836314516274751671001321541763912064125151
11041633512815514147551185714924970134174701352546142
10158165175
相应的星座图为:
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1 | 1.4645+1.2234i |
2 | 1.2234+1.4645i |
3 | 1.2234+1.2234i |
4 | 1.4645+0.9218i |
5 | 1.4645+1.0366i |
6 | 1.2234+0.9218i |
7 | 1.2234+1.0366i |
8 | 0.9218+1.4645i |
9 | 0.9218+1.2234i |
10 | 1.0366+1.4645i |
11 | 1.0366+1.2234i |
12 | 0.9218+0.9218i |
13 | 0.9218+1.0366i |
14 | 1.0366+0.9218i |
15 | 1.0366+1.0366i |
16 | 1.4645+0.5765i |
17 | 1.4645+0.5863i |
18 | 1.2234+0.5765i |
19 | 1.2234+0.5863i |
20 | 1.4645+0.7706i |
21 | 1.4645+0.7279i |
22 | 1.2234+0.7706i |
23 | 1.2234+0.7279i |
24 | 0.9218+0.5765i |
25 | 0.9218+0.5863i |
26 | 1.0366+0.5765i |
27 | 1.0366+0.5863i |
28 | 0.9218+0.7706i |
29 | 0.9218+0.7279i |
30 | 1.0366+0.7706i |
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37 | 0.5765+1.0366i |
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140 | 0.1752+0.9218i |
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143 | 0.1753+1.0366i |
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146 | 0.0641+0.5765i |
147 | 0.0641+0.5863i |
148 | 0.0640+0.7706i |
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151 | 0.0641+0.7279i |
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154 | 0.1753+0.5765i |
155 | 0.1753+0.5863i |
156 | 0.1752+0.7706i |
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158 | 0.1753+0.7706i |
159 | 0.1753+0.7279i |
160 | 0.4342+1.4645i |
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162 | 0.4332+1.4645i |
163 | 0.4332+1.2234i |
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167 | 0.4332+1.0366i |
168 | 0.3073+1.4645i |
169 | 0.3073+1.2234i |
170 | 0.3069+1.4645i |
171 | 0.3069+1.2234i |
172 | 0.3073+0.9218i |
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183 | 0.4332+0.7279i |
184 | 0.3073+0.5765i |
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203 | 0.1753+0.0641i |
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233 | 0.3073+0.0641i |
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253 | 0.3073+0.3069i |
254 | 0.3069+0.3073i |
255 | 0.3069+0.3069i |
256 | 1.4645-1.4645i |
257 | 1.4645-1.2234i |
258 | 1.2234-1.4645i |
259 | 1.2234-1.2234i |
260 | 1.4645-0.9218i |
261 | 1.4645-1.0366i |
262 | 1.2234-0.9218i |
263 | 1.2234-1.0366i |
264 | 0.9218-1.4645i |
265 | 0.9218-1.2234i |
266 | 1.0366-1.4645i |
267 | 1.0366-1.2234i |
268 | 0.9218-0.9218i |
269 | 0.9218-1.0366i |
270 | 1.0366-0.9218i |
271 | 1.0366-1.0366i |
272 | 1.4645-0.5765i |
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274 | 1.2234-0.5765i |
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280 | 0.9218-0.5765i |
281 | 0.9218-0.5863i |
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1021 | -0.3073-0.3069i |
1022 | -0.3069-0.3073i |
1023 | -0.3069-0.3069i |
LDPC码字的码长为64800比特、码率为10/15、Q=60
码表为:
相应的比特图案为:
2229104855010210176591416714432146128368114716998677
1621716611733121737336390471711301401815111516858175131
2430887015523481410149684210713354261371181542035
1561212866149110755191278016311110864169106172876976170
7746513556123103828314391463816417811255611312931
13514297159151524891007810511292624016111911412212019
39167727115379134139150455360215715717414561155962743
158488411610917714823179012616016544379841949313695125
1321242138
相应的星座图为:
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0 | 1.4377+1.4377i |
1 | 1.4377+1.2232i |
2 | 1.2232+1.4377i |
3 | 1.2232+1.2232i |
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6 | 1.2232+0.9302i |
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9 | 0.9302+1.2232i |
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12 | 0.9302+0.9302i |
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14 | 1.0579+0.9302i |
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17 | 1.4377+0.6150i |
18 | 1.2232+0.5505i |
19 | 1.2232+0.6150i |
20 | 1.4377+0.8066i |
21 | 1.4377+0.7158i |
22 | 1.2232+0.8066i |
23 | 1.2232+0.7158i |
24 | 0.9302+0.5505i |
25 | 0.9302+0.6150i |
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27 | 1.0579+0.6150i |
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255 | 0.3091+0.3091i |
256 | 1.4377-1.4377i |
257 | 1.4377-1.2232i |
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259 | 1.2232-1.2232i |
260 | 1.4377-0.9302i |
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268 | 0.9302-0.9302i |
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272 | 1.4377-0.5505i |
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在所述步骤S14中,例如,对于码长为64800比特的LDPC码字(经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,其中每列6480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1024NUC星座图,每八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,十个比特‘0000001100’对应十进制数为12,则对应到表中0.9218+0.9218i的星座点,该星座点在实数轴和虚数轴上的显示为,实数轴0.9218、虚数轴0.9218。然后在调制模块对符号流进行OFDM操作,加入载波进行发射。
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,特定LDPC的码字是以L×L(L通常为360)为子块大小,码表如下:
表1码率9/15Nldpc=64800q×q=360×360,Q=72
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9/15,码长64800的码表为例:
3)
4)对于接下来的L-1个信息比特,(通常L=360),1L-,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+(mmod360)×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:
11315573316568062411040713404139471404014353155221569816079173631937419543205302283324339。
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360.
举表1的码字为例子,
5)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。
6)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。
7)做完步骤5)之后,做如下操作:
其中i=1,2,...,M1-1
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;其中所述符号流软值数据是接收端接收到上述的LDPC码字的交织映射方法得到的符号流经过快速傅里叶变换后得到;
步骤S22:将所述比特软值数据分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。
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 (12)
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;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360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64800比特、码率为8/15;码表为:
相应的比特交换图案为:
411376759949516716412532491405215686327753492141
431751183399544161051706621501369010457178108145110
53931133039692640135160117201278314712321095848127
1211810077129551259835111179741734270101118107453747
64132124621341151080761481241308417616310312012687151139
511461291381579115451692217161651667911673177461617277
2816210215611913361603115286114130361591221311531285644
381552397143112168658314215891069617485891917214815082
1498817144
相应的星座图为:
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LDPC码表中LDPC码字的码长为64800比特、码率为9/15;码表为:
相应的比特交换图案为:
1779132601081712385164801409561261121387615793304815
14815387114774018791431722916188421141056510713912754
43671662794831581011669881212434241121144507111549
152615273122383798926561595953681711561308981147104
78961351369923666313171692234212914417033146119
10316117821336251111102281791509210616013711901132014519
721731091688617836314516274751671001321541763912064125151
11041633512815514147551185714924970134174701352546142
10158165175
相应的星座图为:
6.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64800比特、码率为10/15;码表为:
相应的比特图案为:
2229104855010210176591416714432146128368114716998677
1621716611733121737336390471711301401815111516858175131
2430887015523481410149684210713354261371181542035
1561212866149110755191278016311110864169106172876976170
7746513556123103828314391463816417811255611312931
13514297159151524891007810511292624016111911412212019
39167727115379134139150455360215715717414561155962743
158488411610917714823179012616016544379841949313695125
1321242138
相应的星座图为:
7.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64800比特、码率为6/15;码表为:
相应的比特交换图案为:
1314866761765136103151255461171381489725321391784172
28881344414126211716250631746513731671161709118122130
106901071531041561688595413414138311693684781151401206
1523752764127603096145100626751994371124160115875
1231262980231101294770591089137144164187135165125593
2027374799498248369118150191467756112928211335121
11442161011794586155133681051085317310214712849143142228
10916614915803981911917214017715115917533157577246132
154111163161
相应的星座图为:
8.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64800比特、码率为12/15;
表为:
相应的比特交换图案为:
418873142128157130654878203311641541356147941049240
1095427284147524101291143942601161031111261101431546
124145147281081151014480173174178124381663585164120016
133221391271551238355191121323762125493812215814425162
793134216717591137100138323615995131721467756386166
168191637069508923591497615211507521699813610790179
15653141119742616016112149971296361511675814016517293
131484517111710610530971761779617170134153855871868102
8211811357
相应的星座图为:
9.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64800比特、码率为6/15;码表为:
相应的比特交换图案为:
2713992159150529913219941292010336248782806784116
102517268348146147836611271015031111165164162108143127
1555546213417491903101061235710728471281494664170113
7713311811013914042172431363058716312611941601532213749
1241488656811446791227041744014100391581248953261
78156179154155130117157261761141384416896112025591052337
1733381712885369151601098945173181751661041421781610
11565167125857697141177152211451613529931633512175985
7311169131
相应的星座图为:
10.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64800比特、码率为6/15;码表为:
相应的比特交换图案为:
94341205122669239119170581672595307811299215106153
1218159139466974548861211148113379146271714080110
4379410402137131536908616831116708915410514433152
16362161311266313313577531601581914338124601554911169142
102412911832552610841761652967177127136859317910713891
7516617465103176175173100644782128157151164162717110187141
17828961614245203351721501307112314981109595213213461
727340122489711028414798117238344148115156145650145
1255711168
相应的星座图为:
11.一种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经过快速傅里叶变换后得到;
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。
12.如权利要求11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以得到第三次比特解交织后的比特软值数据。
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