DATA PROCESSING APPARATUS AND DATA PROCESSING METHOD AS WELL AS ENCODING APPARATUS AND ENCODING METHOD
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Abstract
A data processing apparatus, a data processing method, an encoding apparatus, and an encoding method which can be applied, for example, to a transmission system for transmitting an LDPC code and so forth, and which can improve tolerance to errors. Of an LDPC code which is prescribed in the DVB-S.2 and has a code length of 64,800 and an encoding rate of 2/3, mb code bits are replaced, and the code bits after the replacement become symbol bits of b symbols. When m is 8 and b is 2, where the i+1th bit from the most significant bit of 8×2 code bits and 8×2 symbol bits of two successive symbols are represented by bi and yi, respectively, replacement of allocating b0 to y15, b1 to y7, b2 to y1, b3 to y5, b4 to y6, b5 to y13, b6 to y11, b7 to y9, b8 to y8, b9 to y14, b10 to y12, b11 to y3, b12 to y0, b13 to y10, b14 to y4 and b15 to y2.
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Citations
6 Claims
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1-4. -4. (canceled)
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5. A data processing apparatus, wherein:
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where code bits of an LDPC (Low Density Parity Check) code having a code length of N bits are written in a column direction of storage means for storing the code bits in a row direction and the column direction and m bits of the code bits of the LDPC code read out in the row direction are set as one symbol, and besides a predetermined positive integer is represented by b, said storage means stores mb bits in the row direction and stores N/(mb) bits in the column direction; the code bits of the LDPC code being written in the column direction of said storage means and read out in the row direction; said data processing apparatus comprising replacement means for replacing, where the mb code bits read out in the row direction of said storage means set as b symbols, the mb code bits such that the code bits after the replacement form the symbol bits representative of the symbols; the LDPC code being an LDPC code which has a code length N of 64,800 and has an encoding rate of 2/3; the m bits being 8 bits while the integer b is 2; the 8 code bits being mapped as one symbol to ones of 256 signal points prescribed in 256QAM; said storage means having 16 columns for storing 8×
2 bits in the row direction and storing 64,800/(8×
2) bits in the column direction;said replacement means carrying out, where the i+1 th bit from the most significant bit of the 8×
2 code bits read out in the row direction of said storage means is represented as bit bi and the i+1 th bit from the most significant bit of the 8×
2 symbol bits of two successive symbols is represented as bit yi,replacement for allocating the bit b0 to the bit y7, the bit b1 to the bit y2, the bit b2 to the bit y9, the bit b3 to the bit y0, the bit b4 to the bit y4, the bit b5 to the bit y6, the bit b6 to the bit y13, the bit b7 to the bit y3, the bit b8 to the bit y14, the bit b9 to the bit y10, the bit b10 to the bit y15, the bit b11 to the bit y5, the bit b12 to the bit y8, the bit b13 to the bit y12, the bit b14 to the bit y11 the bit b15 to the bit y1, a parity check matrix of the LDPC code being configured such that elements of the value 1 of an information matrix, which corresponds to the code length N of the parity check matrix and an information length corresponding to the encoding rate, decided by a parity check matrix initial value table representative of the positions of the elements of the value 1 of the information matrix for every 360 columns are arranged in a period of every 360 columns in the column direction; the parity check matrix initial value table being formed from 317 2255 2324 2723 3538 3576 6194 6700 9101 10057 12739 17407 21039 1958 2007 3294 4394 12762 14505 14593 14692 16522 17737 19245 21272 21379 127 860 5001 5633 8644 9282 12690 14644 17553 19511 19681 20954 21002 2514 2822 5781 6297 8063 9469 9551 11407 11837 12985 15710 20236 20393 1565 3106 4659 4926 6495 6872 7343 8720 15785 16434 16727 19884 21325 706 3220 8568 10896 12486 13663 16398 16599 19475 19781 20625 20961 21335 4257 10449 12406 14561 16049 16522 17214 18029 18033 18802 19062 19526 20748 412 433 558 2614 2978 4157 6584 9320 11683 11819 13024 14486 16860 777 5906 7403 8550 8717 8770 11436 12846 13629 14755 15688 16392 16419 4093 5045 6037 7248 8633 9771 10260 10809 11326 12072 17516 19344 19938 2120 2648 3155 3852 6888 12258 14821 15359 16378 16437 17791 20614 21025 1085 2434 5816 7151 8050 9422 10884 12728 15353 17733 18140 18729 20920 856 1690 12787 6532 7357 9151 4210 16615 18152 11494 14036 17470 2474 10291 10323 1778 6973 10739 4347 9570 18748 2189 11942 20666 3868 7526 17706 8780 14796 18268 160 16232 17399 1285 2003 18922 4658 17331 20361 2765 4862 5875 4565 5521 8759 3484 7305 15829 5024 17730 17879 7031 12346 15024 179 6365 11352 2490 3143 5098 2643 3101 21259 4315 4724 13130 594 17365 18322 5983 8597 9627 10837 15102 20876 10448 20418 21478 3848 12029 15228 708 5652 13146 5998 7534 16117 2098 13201 18317 9186 14548 17776 5246 10398 18597 3083 4944 21021 13726 18495 19921 6736 10811 17545 10084 12411 14432 1064 13555 17033 679 9878 13547 3422 9910 20194 3640 3701 10046 5862 10134 11498 5923 9580 15060 1073 3012 16427 5527 20113 20883 7058 12924 15151 9764 12230 17375 772 7711 12723 555 13816 15376 10574 11268 17932 15442 17266 20482 390 3371 8781 10512 12216 17180 4309 14068 15783 3971 11673 20009 9259 14270 17199 2947 5852 20101 3965 9722 15363 1429 5689 16771 6101 6849 12781 3676 9347 18761 350 11659 18342 5961 14803 16123 2113 9163 13443 2155 9808 12885 2861 7988 11031 7309 9220 20745 6834 8742 11977 2133 12908 14704 10170 13809 18153 13464 14787 14975 799 1107 3789 3571 8176 10165 5433 13446 15481 3351 6767 12840 8950 8974 11650 1430 4250 21332 6283 10628 15050 8632 14404 16916 6509 10702 16278 15900 16395 17995 8031 18420 19733 3747 4634 17087 4453 6297 16262 2792 3513 17031 14846 20893 21563 17220 20436 21337 275 4107 10497 3536 7520 10027 14089 14943 19455 1965 3931 21104 2439 11565 17932 154 15279 21414 10017 11269 16546 7169 10161 16928 10284 16791 20655 36 3175 8475 2605 16269 19290 8947 9178 15420 5687 9156 12408 8096 9738 14711 4935 8093 19266 2667 10062 15972 6389 11318 14417 8800 18137 18434 5824 5927 15314 6056 13168 15179 3284 13138 18919 13115 17259 17332
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6. A data processing method, wherein,
where code bits of an LDPC (Low Density Parity Check) code having a code length of N bits are written in a column direction of storage means for storing the code bits in a row direction and the column direction and m bits of the code bits of the LDPC code read out in the row direction are set as one symbol, and besides a predetermined positive integer is represented by b, the storage means stores mb bits in the row direction and stores N/(mb) bits in the column direction; -
the code bits of the LDPC code being written in the column direction of the storage means and read out in the row direction; the data processing method comprising a replacement step of replacing, where the mb code bits read out in the row direction of the storage means set as b symbols, the mb code bits such that the code bits after the replacement form the symbol bits representative of the symbols; the LDPC code being an LDPC code which has a code length N of 64,800 and has an encoding rate of 2/3; the m bits being 8 bits while the integer b is 2; the 8 code bits being mapped as one symbol to ones of 256 signal points prescribed in 256QAM; the storage means having 16 columns for storing 8×
2 bits in the row direction and storing 64,800/(8×
2) bits in the column direction;at the replacement step, where the i+1 th bit from the most significant bit of the 8×
2 code bits read out in the row direction of the storage means is represented as bit bi and the i+1 th bit from the most significant bit of the 8×
2 symbol bits of two successive symbols is represented as bit yi,replacement for allocating the bit b0 to the bit y7, the bit b1 to the bit y2, the bit b2 to the bit y9, the bit b3 to the bit y0, the bit b4 to the bit y4, the bit b5 to the bit y6, the bit b6 to the bit y13, the bit b7 to the bit y3, the bit b8 to the bit y14, the bit b9 to the bit y10, the bit b10 to the bit y15, the bit b11 to the bit y5, the bit b12 to the bit y8, the bit b13 to the bit y12, the bit b14 to the bit y11, the bit b15 to the bit y1, being carried out; a parity check matrix of the LDPC code being configured such that elements of the value 1 of an information matrix, which corresponds to the code length N of the parity check matrix and an information length corresponding to the encoding rate, decided by a parity check matrix initial value table representative of the positions of the elements of the value 1 of the information matrix for every 360 columns are arranged in a period of every 360 columns in the column direction; the parity check matrix initial value table being formed from 317 2255 2324 2723 3538 3576 6194 6700 9101 10057 12739 17407 21039 1958 2007 3294 4394 12762 14505 14593 14692 16522 17737 19245 21272 21379 127 860 5001 5633 8644 9282 12690 14644 17553 19511 19681 20954 21002 2514 2822 5781 6297 8063 9469 9551 11407 11837 12985 15710 20236 20393 1565 3106 4659 4926 6495 6872 7343 8720 15785 16434 16727 19884 21325 706 3220 8568 10896 12486 13663 16398 16599 19475 19781 20625 20961 21335 4257 10449 12406 14561 16049 16522 17214 18029 18033 18802 19062 19526 20748 412 433 558 2614 2978 4157 6584 9320 11683 11819 13024 14486 16860 777 5906 7403 8550 8717 8770 11436 12846 13629 14755 15688 16392 16419 4093 5045 6037 7248 8633 9771 10260 10809 11326 12072 17516 19344 19938 2120 2648 3155 3852 6888 12258 14821 15359 16378 16437 17791 20614 21025 1085 2434 5816 7151 8050 9422 10884 12728 15353 17733 18140 18729 20920 856 1690 12787 6532 7357 9151 4210 16615 18152 11494 14036 17470 2474 10291 10323 1778 6973 10739 4347 9570 18748 2189 11942 20666 3868 7526 17706 8780 14796 18268 160 16232 17399 1285 2003 18922 4658 17331 20361 2765 4862 5875 4565 5521 8759 3484 7305 15829 5024 17730 17879 7031 12346 15024 179 6365 11352 2490 3143 5098 2643 3101 21259 4315 4724 13130 594 17365 18322 5983 8597 9627 10837 15102 20876 10448 20418 21478 3848 12029 15228 708 5652 13146 5998 7534 16117 2098 13201 18317 9186 14548 17776 5246 10398 18597 3083 4944 21021 13726 18495 19921 6736 10811 17545 10084 12411 14432 1064 13555 17033 679 9878 13547 3422 9910 20194 3640 3701 10046 5862 10134 11498 5923 9580 15060 1073 3012 16427 5527 20113 20883 7058 12924 15151 9764 12230 17375 772 7711 12723 555 13816 15376 10574 11268 17932 15442 17266 20482 390 3371 8781 10512 12216 17180 4309 14068 15783 3971 11673 20009 9259 14270 17199 2947 5852 20101 3965 9722 15363 1429 5689 16771 6101 6849 12781 3676 9347 18761 350 11659 18342 5961 14803 16123 2113 9163 13443 2155 9808 12885 2861 7988 11031 7309 9220 20745 6834 8742 11977 2133 12908 14704 10170 13809 18153 13464 14787 14975 799 1107 3789 3571 8176 10165 5433 13446 15481 3351 6767 12840 8950 8974 11650 1430 4250 21332 6283 10628 15050 8632 14404 16916 6509 10702 16278 15900 16395 17995 8031 18420 19733 3747 4634 17087 4453 6297 16262 2792 3513 17031 14846 20893 21563 17220 20436 21337 275 4107 10497 3536 7520 10027 14089 14943 19455 1965 3931 21104 2439 11565 17932 154 15279 21414 10017 11269 16546 7169 10161 16928 10284 16791 20655 36 3175 8475 2605 16269 19290 8947 9178 15420 5687 9156 12408 8096 9738 14711 4935 8093 19266 2667 10062 15972 6389 11318 14417 8800 18137 18434 5824 5927 15314 6056 13168 15179 3284 13138 18919 13115 17259 17332
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Specification