1.一種LDPC碼字的交織映射方法，其特征在于，包括如下步驟：
將所述LDPC碼字中的校驗(yàn)部分進(jìn)行第一次比特交織以得到校 驗(yàn)比特流；
將所述LDPC碼字中的信息比特部分與所述校驗(yàn)比特流拼接成 第一次比特交織后的LDPC碼字；
將所述第一次比特交織后的LDPC碼字按預(yù)定長(zhǎng)度分成連續(xù)的 多個(gè)比特子塊，并按照相應(yīng)的比特交換圖案變換所述比特子塊的排列 順序以形成第二次比特交織后的LDPC碼字；
將所述第二次比特交織后的LDPC碼字按列順序?qū)懭氪鎯?chǔ)空間 并按行順序從該存儲(chǔ)空間內(nèi)讀出，得到第三次比特交織后的LDPC碼 字；
對(duì)所述第三次比特交織后的LDPC碼字依照相應(yīng)的星座圖進(jìn)行 星座映射以得到符號(hào)流；其中，所述比特交換圖案和所述星座圖都與 不同碼率的LDPC碼表相對(duì)應(yīng)。
4.如權(quán)利要求1所述的LDPC碼字的交織映射方法，其特征在于， 所述LDPC碼表中LDPC碼字的碼長(zhǎng)為57600比特、碼率為1/4； 碼表為：
相應(yīng)的比特交換圖案為：
相應(yīng)的星座圖為：
星座點(diǎn) 復(fù)數(shù)符號(hào)
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
