Data processing device and data processing method for encoding/decoding information bits
View Patent ↗A data processing device and a data processing method capable of improving the resistance to error of data. An LDPC encoder performs encoding using an LDPC code having a code length of 4320 bits and a coded rate of one of four types including ½, 7/12, ⅔, ¾. A parity check matrix H of the LDPC code is configured by arranging elements of 1's of an information matrix, which are determined based on a parity check matrix initial value table of the parity check matrix H representing positions of elements of 1's of the information matrix corresponding to an information length according to the code length and the coded rate for every 72 columns, in a column direction at a period of 72 columns. The parity check matrix initial value table, for example, is used for digital broadcasting for mobile terminals.
1. A data processing device that performs encoding of information bits, comprising:
circuitry configured to perform encoding of the information bits into LDPC (Low Density Parity Check) code having a code length of 4320 bits in a coded rate of ½ based on a parity check matrix,
wherein the parity check matrix includes an information matrix and a parity matrix,
wherein the information matrix is represented by a parity check matrix initial value table which represent positions of elements of 1's of the information matrix, and
wherein the parity check matrix initial value table includes a following table:
142 150 213 247 507 538 578 828 969 1042 1107 1315 1509 1584
1612 1781 1934 2106 2117
3 17 20 31 97 466 571 580 842 983 1152 1226 1261 1392 1413
1465 1480 2047 2125
49 169 258 548 582 839 873 881 931 995 1145 1209 1639 1654
1776 1826 1865 1906 1956
148 393 396 486 568 806 909 965 1203 1256 1306 1371 1402 1534
1664 1736 1844 1947 2055
185 191 263 290 384 769 981 1071 1202 1357 1554 1723 1769 1815
1842 1880 1910 1926 1991
424 444 923 1679
91 436 535 978
362 677 821 1695
1117 1392 1454 2030
35 840 1477 2152
1061 1202 1836 1879
242 286 1140 1538
111 240 481 760
59 1268 1899 2144
737 1299 1395 2072
34 288 810 1903
232 1013 1365 1729
410 783 1066 1187
113 885 1423 1560
760 909 1475 2048
68 254 420 1867
283 325 334 970
168 321 479 554
378 836 1913 1928
101 238 964 1393
304 460 1497 1588
151 192 1075 1614
297 313 677 1303
329 447 1348 1832
582 831 984 1900.
2. A method of encoding information bits, comprising:
encoding, by circuitry of an data processing device, the information bits into LDPC (Low Density Parity Check) code having a code length of 4320 bits in a coded rate of ½, wherein the parity check matrix includes an information matrix and a parity matrix, wherein the information matrix is represented by a parity check matrix initial value table which represent positions of elements of 1's of the information matrix, and
wherein the parity check matrix initial value table includes a following table:
142 150 213 247 507 538 578 828 969 1042 1107 1315 1509 1584
1612 1781 1934 2106 2117
3 17 20 31 97 466 571 580 842 983 1152 1226 1261 1392 1413
1465 1480 2047 2125
49 169 258 548 582 839 873 881 931 995 1145 1209 1639 1654 1776
1826 1865 1906 1956
148 393 396 486 568 806 909 965 1203 1256 1306 1371 1402 1534
1664 1736 1844 1947 2055
185 191 263 290 384 769 981 1071 1202 1357 1554 1723 1769 1815
1842 1880 1910 1926 1991
424 444 923 1679
91 436 535 978
362 677 821 1695
1117 1392 1454 2030
35 840 1477 2152
1061 1202 1836 1879
242 286 1140 1538
111 240 481 760
59 1268 1899 2144
737 1299 1395 2072
34 288 810 1903
232 1013 1365 1729
410 783 1066 1187
113 885 1423 1560
760 909 1475 2048
68 254 420 1867
283 325 334 970
168 321 479 554
378 836 1913 1928
101 238 964 1393
304 460 1497 1588
151 192 1075 1614
297 313 677 1303
329 447 1348 1832
582 831 984 1900.
3. A data processing device for decoding an LDPC (Low Density Parity Check) code, the data processing device comprising:
circuitry configured to decode the LDPC code having a code length of 4320 bits in a coded rate of ½ based on a parity check matrix into information bits,
wherein the parity check matrix includes an information matrix and a parity matrix,
wherein the information matrix is represented by a parity check matrix initial value table which represent positions of elements of 1's of the information matrix, and
wherein the parity check matrix initial value table includes a following table:
142 150 213 247 507 538 578 828 969 1042 1107 1315 1509 1584
1612 1781 1934 2106 2117
3 17 20 31 97 466 571 580 842 983 1152 1226 1261 1392 1413
1465 1480 2047 2125
49 169 258 548 582 839 873 881 931 995 1145 1209 1639 1654 1776
1826 1865 1906 1956
148 393 396 486 568 806 909 965 1203 1256 1306 1371 1402 1534
1664 1736 1844 1947 2055
185 191 263 290 384 769 981 1071 1202 1357 1554 1723 1769 1815
1842 1880 1910 1926 1991
424 444 923 1679
91 436 535 978
362 677 821 1695
1117 1392 1454 2030
35 840 1477 2152
1061 1202 1836 1879
242 286 1140 1538
111 240 481 760
59 1268 1899 2144
737 1299 1395 2072
34 288 810 1903
232 1013 1365 1729
410 783 1066 1187
113 885 1423 1560
760 909 1475 2048
68 254 420 1867
283 325 334 970
168 321 479 554
378 836 1913 1928
101 238 964 1393
304 460 1497 1588
151 192 1075 1614
297 313 677 1303
329 447 1348 1832
582 831 984 1900.
4. The data processing device according to claim 3 , wherein the circuitry is further configured to:
deinterleave only parity bits of the LDPC code.
5. The data processing device according to claim 3 , further comprising:
a memory configured to store the LDPC code in a plurality of columns, wherein the circuitry is further configured to
deinterleave the stored data in the plurality of columns in the column direction.
6. The data processing device according to claim 3 , wherein a 2+360×(i−1) column of the parity check matrix is a cyclically shifted 1+360×(i−1) column by M/360(=q) (i is the number of column in the parity check matrix M is parity length).
7. A data processing method for decoding an LDPC (Low Density Parity Check) code, comprising:
decoding, by circuitry of a data processing device, the LDPC code having a code length of 4320 bits in a coded rate of ½ based on a parity check matrix,
wherein the parity check matrix includes an information matrix and a parity matrix,
wherein the information matrix is represented by a parity check matrix initial value table which represent positions of elements of 1's of the information matrix, and
wherein the parity check matrix initial value table includes a following table:
142 150 213 247 507 538 578 828 969 1042 1107 1315 1509 1584
1612 1781 1934 2106 2117
3 17 20 31 97 466 571 580 842 983 1152 1226 1261 1392 1413
1465 1480 2047 2125
49 169 258 548 582 839 873 881 931 995 1145 1209 1639 1654 1776
1826 1865 1906 1956
148 393 396 486 568 806 909 965 1203 1256 1306 1371 1402 1534
1664 1736 1844 1947 2055
185 191 263 290 384 769 981 1071 1202 1357 1554 1723 1769 1815
1842 1880 1910 1926 1991
424 444 923 1679
91 436 535 978
362 677 821 1695
1117 1392 1454 2030
35 840 1477 2152
1061 1202 1836 1879
242 286 1140 1538
111 240 481 760
59 1268 1899 2144
737 1299 1395 2072
34 288 810 1903
232 1013 1365 1729
410 783 1066 1187
113 885 1423 1560
760 909 1475 2048
68 254 420 1867
283 325 334 970
168 321 479 554
378 836 1913 1928
101 238 964 1393
304 460 1497 1588
151 192 1075 1614
297 313 677 1303
329 447 1348 1832
582 831 984 1900.
8. The data processing method according to claim 7 , further comprising:
deinterleaving, by the circuitry, only parity bits of the LDPC code.
9. The data processing method according to claim 7 , further comprising:
deinterleaving, by the circuitry, the LDPC data, which is stored by a memory in a plurality of columns, in the column direction.
10. The data processing method according to claim 7 ,
wherein a 2+360×(i−1) column of the parity check matrix is a cyclically shifted 1+360×(i−1) column by M/360(=q) (i is the number of column in the parity check matrix M is parity length).