Data processing apparatus and data processing method

A method for use by a receiving device in an environment where a signal-to-noise power ratio per symbol for a selected bit error rate of a terrestrial digital television broadcast signal can be reduced and/or a reception range of a terrestrial digital television broadcast signal can be expanded, the method comprising:

• receiving, by a tuner, a terrestrial digital television broadcast signal including a mapped LDPC (low density parity check) code word;
• demapping the mapped LDPC code word to produce an LDPC code word, wherein each unit of 4 bits of the LDPC code word is mapped to one of 16 signal points of a 16APSK modulation scheme;
• decoding the LDPC code word;
• and
• processing the decoded LDPC code word for presentation to a user, wherein
• input bits of data to be transmitted in the terrestrial digital television broadcast signal are LDPC encoded according to a parity check matrix of an LDPC code having a code length of 16200 bits and a code rate of 7/15 to generate the LDPC code word, the LDPC code enabling error correction processing to correct errors generated in a transmission path of the terrestrial digital television broadcast signal,
• the LDPC code word includes information bits and parity bits, the parity bits being processed by the receiving device to recover information bits corrupted by transmission path errors,
• a parity check matrix initial value table of the LDPC code according to which the input bits are LDPC encoded is as follows,
• 3 137 314 327 983 1597 2028 3043 3217 4109 6020 6178 6535 6560 7146 7180 7408 7790 7893 8123 8313 8526 8616 8638
• 356 1197 1208 1839 1903 2712 3088 3537 4091 4301 4919 5068 6025 6195 6324 6378 6686 6829 7558 7745 8042 8382 8587 8602
• 18 187 1115 1417 1463 2300 2328 3502 3805 4677 4827 5551 5968 6394 6412 6753 7169 7524 7695 7976 8069 8118 8522 8582
• 714 2713 2726 2964 3055 3220 3334 3459 5557 5765 5841 6290 6419 6573 6856 7786 7937 8156 8286 8327 8384 8448 8539 8559
• 3452 7935 8092 8623
• 56 1955 3000 8242
• 1809 4094 7991 8489
• 2220 6455 7849 8548
• 1006 2576 3247 6976
• 2177 6048 7795 8295
• 1413 2595 7446 8594
• 2101 3714 7541 8531
• 10 5961 7484
• 3144 4636 5282
• 5708 5875 8390
• 3322 5223 7975
• 197 4653 8283
• 598 5393 8624
• 906 7249 7542
• 1223 2148 8195
• 976 2001 5005,
• the LDPC code word is mapped to one of the 16 signal points in the 16APSK modulation scheme in units of 4 bits,
• the 16 signal points in the 16APSK modulation scheme are 4 signal points on an inner circle and 12 signal points on an outer circle, and
• a radius ratio of the inner circle and the outer circle is 3.32.

A receiving device for use in an environment where a signal-to-noise power ratio per symbol for a selected bit error rate of the received terrestrial digital television broadcast signal can be reduced and/or a reception range of a terrestrial digital television broadcast signal can be expanded, the receiving device comprising:

• a tuner configured to receive a terrestrial digital television broadcast signal including a mapped low density parity check (LDPC) code word;
• and
• circuitry configured to
• demap the mapped LDPC code word to produce an LDPC code word, wherein each unit of 4 bits of the LDPC code word is mapped to one of 16 signal points of a 16APSK modulation scheme;
• decode the LDPC code word;
• and
• process the decoded LDPC code word for presentation to a user, wherein
• input bits of data to be transmitted in the terrestrial digital television broadcast signal are LDPC encoded according to a parity check matrix of an LDPC code having a code length of 16200 bits and a code rate of 8/15 to generate the LDPC code word, the LDPC code enabling error correction processing to correct errors generated in a transmission path of the terrestrial digital television broadcast signal,
• the LDPC code word includes information bits and parity bits, the parity bits being processed by the receiving device to recover information bits corrupted by transmission path errors,
• a parity check matrix initial value table of the LDPC code according to which the input bits are LDPC encoded is as follows,
• 32 384 430 591 1296 1976 1999 2137 2175 3638 4214 4304 4486 4662 4999 5174 5700 6969 7115 7138 7189
• 1788 1881 1910 2724 4504 4928 4973 5616 5686 5718 5846 6523 6893 6994 7074 7100 7277 7399 7476 7480 7537
• 2791 2824 2927 4196 4298 4800 4948 5361 5401 5688 5818 5862 5969 6029 6244 6645 6962 7203 7302 7454 7534
• 574 1461 1826 2056 2069 2387 2794 3349 3366 4951 5826 5834 5903 6640 6762 6786 6859 7043 7418 7431 7554
• 14 178 675 823 890 930 1209 1311 2898 4339 4600 5203 6485 6549 6970 7208 7218 7298 7454 7457 7462
• 4075 4188 7313 7553
• 5145 6018 7148 7507
• 3198 4858 6983 7033
• 3170 5126 5625 6901
• 2839 6093 7071 7450
• 11 3735 5413
• 2497 5400 7238
• 2067 5172 5714
• 1889 7173 7329
• 1795 2773 3499
• 2695 2944 6735
• 3221 4625 5897
• 1690 6122 6816
• 5013 6839 7358
• 1601 6849 7415
• 2180 7389 7543
• 2121 6838 7054
• 1948 3109 5046
• 272 1015 7464,
• the LDPC code word is mapped to one of the 16 signal points in the 16APSK modulation scheme in units of 4 bits,
• the 16 signal points in the 16APSK modulation scheme are 4 signal points on an inner circle and 12 signal points on an outer circle, and
• a radius ratio of the inner circle and the outer circle is 3.50.

A method for use by a receiving device in an environment where a signal-to-noise power ratio per symbol for a selected bit error rate of a terrestrial digital television broadcast signal can be reduced and/or a reception range of a terrestrial digital television broadcast signal can be expanded, the method comprising:

• receiving, by a tuner, a terrestrial digital television broadcast signal including a mapped low density parity check (LDPC) code word;
• demapping the mapped LDPC code word to produce an LDPC code word, wherein each unit of 4 bits of the LDPC code word is mapped to one of 16 signal points of a 16APSK modulation scheme;
• decoding the LDPC code word;
• and
• process the decoded LDPC code word for presentation to a user, wherein
• input bits of data to be transmitted in the terrestrial digital television broadcast signal are LDPC encoded according to a parity check matrix of an LDPC code having a code length of 16200 bits and a code rate of 8/15 to generate the LDPC code word, the LDPC code enabling error correction processing to correct errors generated in a transmission path of the terrestrial digital television broadcast signal,
• the LDPC code word includes information bits and parity bits, the parity bits being processed by the receiving device to recover information bits corrupted by transmission path errors,
• a parity check matrix initial value table of the LDPC code according to which the input bits are LDPC encoded is as follows,
• 32 384 430 591 1296 1976 1999 2137 2175 3638 4214 4304 4486 4662 4999 5174 5700 6969 7115 7138 7189
• 1788 1881 1910 2724 4504 4928 4973 5616 5686 5718 5846 6523 6893 6994 7074 7100 7277 7399 7476 7480 7537
• 2791 2824 2927 4196 4298 4800 4948 5361 5401 5688 5818 5862 5969 6029 6244 6645 6962 7203 7302 7454 7534
• 574 1461 1826 2056 2069 2387 2794 3349 3366 4951 5826 5834 5903 6640 6762 6786 6859 7043 7418 7431 7554
• 14 178 675 823 890 930 1209 1311 2898 4339 4600 5203 6485 6549 6970 7208 7218 7298 7454 7457 7462
• 4075 4188 7313 7553
• 5145 6018 7148 7507
• 3198 4858 6983 7033
• 3170 5126 5625 6901
• 2839 6093 7071 7450
• 11 3735 5413
• 2497 5400 7238
• 2067 5172 5714
• 1889 7173 7329
• 1795 2773 3499
• 2695 2944 6735
• 3221 4625 5897
• 1690 6122 6816
• 5013 6839 7358
• 1601 6849 7415
• 2180 7389 7543
• 2121 6838 7054
• 1948 3109 5046
• 272 1015 7464,
• the LDPC code word is mapped to one of the 16 signal points in the 16APSK modulation scheme in units of 4 bits,
• the 16 signal points in the 16APSK modulation scheme are 4 signal points on an inner circle and 12 signal points on an outer circle, and
• a radius ratio of the inner circle and the outer circle is 3.50.