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300 lines
8.8 KiB
C++
300 lines
8.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This is the code from ft8mon: https://github.com/rtmrtmrtmrtm/ft8mon //
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// reformatted and adapted to Qt and SDRangel context //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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namespace FT8 {
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//
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// this is the LDPC(174,91) parity check matrix.
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// each row describes one parity check.
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// 83 rows.
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// each number is an index into the codeword (1-origin).
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// the codeword bits mentioned in each row must xor to zero.
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// From WSJT-X's ldpc_174_91_c_reordered_parity.f90
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//
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int Nm[][7] = {
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{ 4, 31, 59, 91, 92, 96, 153 },
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{ 5, 32, 60, 93, 115, 146, 0 },
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{ 6, 24, 61, 94, 122, 151, 0 },
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{ 7, 33, 62, 95, 96, 143, 0 },
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{ 8, 25, 63, 83, 93, 96, 148 },
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{ 6, 32, 64, 97, 126, 138, 0 },
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{ 5, 34, 65, 78, 98, 107, 154 },
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{ 9, 35, 66, 99, 139, 146, 0 },
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{ 10, 36, 67, 100, 107, 126, 0 },
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{ 11, 37, 67, 87, 101, 139, 158 },
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{ 12, 38, 68, 102, 105, 155, 0 },
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{ 13, 39, 69, 103, 149, 162, 0 },
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{ 8, 40, 70, 82, 104, 114, 145 },
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{ 14, 41, 71, 88, 102, 123, 156 },
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{ 15, 42, 59, 106, 123, 159, 0 },
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{ 1, 33, 72, 106, 107, 157, 0 },
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{ 16, 43, 73, 108, 141, 160, 0 },
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{ 17, 37, 74, 81, 109, 131, 154 },
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{ 11, 44, 75, 110, 121, 166, 0 },
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{ 45, 55, 64, 111, 130, 161, 173 },
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{ 8, 46, 71, 112, 119, 166, 0 },
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{ 18, 36, 76, 89, 113, 114, 143 },
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{ 19, 38, 77, 104, 116, 163, 0 },
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{ 20, 47, 70, 92, 138, 165, 0 },
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{ 2, 48, 74, 113, 128, 160, 0 },
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{ 21, 45, 78, 83, 117, 121, 151 },
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{ 22, 47, 58, 118, 127, 164, 0 },
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{ 16, 39, 62, 112, 134, 158, 0 },
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{ 23, 43, 79, 120, 131, 145, 0 },
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{ 19, 35, 59, 73, 110, 125, 161 },
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{ 20, 36, 63, 94, 136, 161, 0 },
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{ 14, 31, 79, 98, 132, 164, 0 },
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{ 3, 44, 80, 124, 127, 169, 0 },
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{ 19, 46, 81, 117, 135, 167, 0 },
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{ 7, 49, 58, 90, 100, 105, 168 },
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{ 12, 50, 61, 118, 119, 144, 0 },
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{ 13, 51, 64, 114, 118, 157, 0 },
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{ 24, 52, 76, 129, 148, 149, 0 },
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{ 25, 53, 69, 90, 101, 130, 156 },
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{ 20, 46, 65, 80, 120, 140, 170 },
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{ 21, 54, 77, 100, 140, 171, 0 },
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{ 35, 82, 133, 142, 171, 174, 0 },
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{ 14, 30, 83, 113, 125, 170, 0 },
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{ 4, 29, 68, 120, 134, 173, 0 },
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{ 1, 4, 52, 57, 86, 136, 152 },
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{ 26, 51, 56, 91, 122, 137, 168 },
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{ 52, 84, 110, 115, 145, 168, 0 },
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{ 7, 50, 81, 99, 132, 173, 0 },
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{ 23, 55, 67, 95, 172, 174, 0 },
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{ 26, 41, 77, 109, 141, 148, 0 },
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{ 2, 27, 41, 61, 62, 115, 133 },
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{ 27, 40, 56, 124, 125, 126, 0 },
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{ 18, 49, 55, 124, 141, 167, 0 },
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{ 6, 33, 85, 108, 116, 156, 0 },
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{ 28, 48, 70, 85, 105, 129, 158 },
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{ 9, 54, 63, 131, 147, 155, 0 },
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{ 22, 53, 68, 109, 121, 174, 0 },
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{ 3, 13, 48, 78, 95, 123, 0 },
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{ 31, 69, 133, 150, 155, 169, 0 },
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{ 12, 43, 66, 89, 97, 135, 159 },
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{ 5, 39, 75, 102, 136, 167, 0 },
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{ 2, 54, 86, 101, 135, 164, 0 },
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{ 15, 56, 87, 108, 119, 171, 0 },
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{ 10, 44, 82, 91, 111, 144, 149 },
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{ 23, 34, 71, 94, 127, 153, 0 },
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{ 11, 49, 88, 92, 142, 157, 0 },
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{ 29, 34, 87, 97, 147, 162, 0 },
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{ 30, 50, 60, 86, 137, 142, 162 },
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{ 10, 53, 66, 84, 112, 128, 165 },
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{ 22, 57, 85, 93, 140, 159, 0 },
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{ 28, 32, 72, 103, 132, 166, 0 },
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{ 28, 29, 84, 88, 117, 143, 150 },
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{ 1, 26, 45, 80, 128, 147, 0 },
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{ 17, 27, 89, 103, 116, 153, 0 },
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{ 51, 57, 98, 163, 165, 172, 0 },
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{ 21, 37, 73, 138, 152, 169, 0 },
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{ 16, 47, 76, 130, 137, 154, 0 },
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{ 3, 24, 30, 72, 104, 139, 0 },
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{ 9, 40, 90, 106, 134, 151, 0 },
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{ 15, 58, 60, 74, 111, 150, 163 },
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{ 18, 42, 79, 144, 146, 152, 0 },
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{ 25, 38, 65, 99, 122, 160, 0 },
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{ 17, 42, 75, 129, 170, 172, 0 },
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};
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// Mn from WSJT-X's ldpc_174_91_c_reordered_parity.f90
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// each of the 174 rows corresponds to a codeword bit.
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// the numbers indicate which three parity
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// checks (rows in Nm) refer to the codeword bit.
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// 1-origin.
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int Mn[][3] = {
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{ 16, 45, 73 },
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{ 25, 51, 62 },
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{ 33, 58, 78 },
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{ 1, 44, 45 },
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{ 2, 7, 61 },
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{ 3, 6, 54 },
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{ 4, 35, 48 },
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{ 5, 13, 21 },
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{ 8, 56, 79 },
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{ 9, 64, 69 },
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{ 10, 19, 66 },
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{ 11, 36, 60 },
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{ 12, 37, 58 },
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{ 14, 32, 43 },
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{ 15, 63, 80 },
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{ 17, 28, 77 },
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{ 18, 74, 83 },
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{ 22, 53, 81 },
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{ 23, 30, 34 },
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{ 24, 31, 40 },
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{ 26, 41, 76 },
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{ 27, 57, 70 },
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{ 29, 49, 65 },
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{ 3, 38, 78 },
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{ 5, 39, 82 },
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{ 46, 50, 73 },
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{ 51, 52, 74 },
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{ 55, 71, 72 },
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{ 44, 67, 72 },
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{ 43, 68, 78 },
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{ 1, 32, 59 },
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{ 2, 6, 71 },
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{ 4, 16, 54 },
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{ 7, 65, 67 },
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{ 8, 30, 42 },
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{ 9, 22, 31 },
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{ 10, 18, 76 },
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{ 11, 23, 82 },
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{ 12, 28, 61 },
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{ 13, 52, 79 },
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{ 14, 50, 51 },
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{ 15, 81, 83 },
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{ 17, 29, 60 },
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{ 19, 33, 64 },
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{ 20, 26, 73 },
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{ 21, 34, 40 },
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{ 24, 27, 77 },
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{ 25, 55, 58 },
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{ 35, 53, 66 },
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{ 36, 48, 68 },
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{ 37, 46, 75 },
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{ 38, 45, 47 },
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{ 39, 57, 69 },
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{ 41, 56, 62 },
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{ 20, 49, 53 },
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{ 46, 52, 63 },
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{ 45, 70, 75 },
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{ 27, 35, 80 },
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{ 1, 15, 30 },
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{ 2, 68, 80 },
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{ 3, 36, 51 },
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{ 4, 28, 51 },
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{ 5, 31, 56 },
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{ 6, 20, 37 },
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{ 7, 40, 82 },
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{ 8, 60, 69 },
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{ 9, 10, 49 },
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{ 11, 44, 57 },
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{ 12, 39, 59 },
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{ 13, 24, 55 },
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{ 14, 21, 65 },
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{ 16, 71, 78 },
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{ 17, 30, 76 },
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{ 18, 25, 80 },
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{ 19, 61, 83 },
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{ 22, 38, 77 },
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{ 23, 41, 50 },
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{ 7, 26, 58 },
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{ 29, 32, 81 },
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{ 33, 40, 73 },
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{ 18, 34, 48 },
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{ 13, 42, 64 },
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{ 5, 26, 43 },
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{ 47, 69, 72 },
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{ 54, 55, 70 },
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{ 45, 62, 68 },
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{ 10, 63, 67 },
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{ 14, 66, 72 },
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{ 22, 60, 74 },
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{ 35, 39, 79 },
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{ 1, 46, 64 },
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{ 1, 24, 66 },
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{ 2, 5, 70 },
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{ 3, 31, 65 },
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{ 4, 49, 58 },
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{ 1, 4, 5 },
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{ 6, 60, 67 },
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{ 7, 32, 75 },
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{ 8, 48, 82 },
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{ 9, 35, 41 },
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{ 10, 39, 62 },
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{ 11, 14, 61 },
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{ 12, 71, 74 },
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{ 13, 23, 78 },
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{ 11, 35, 55 },
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{ 15, 16, 79 },
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{ 7, 9, 16 },
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{ 17, 54, 63 },
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{ 18, 50, 57 },
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{ 19, 30, 47 },
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{ 20, 64, 80 },
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{ 21, 28, 69 },
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{ 22, 25, 43 },
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{ 13, 22, 37 },
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{ 2, 47, 51 },
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{ 23, 54, 74 },
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{ 26, 34, 72 },
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{ 27, 36, 37 },
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{ 21, 36, 63 },
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{ 29, 40, 44 },
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{ 19, 26, 57 },
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{ 3, 46, 82 },
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{ 14, 15, 58 },
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{ 33, 52, 53 },
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{ 30, 43, 52 },
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{ 6, 9, 52 },
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{ 27, 33, 65 },
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{ 25, 69, 73 },
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{ 38, 55, 83 },
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{ 20, 39, 77 },
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{ 18, 29, 56 },
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{ 32, 48, 71 },
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{ 42, 51, 59 },
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{ 28, 44, 79 },
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{ 34, 60, 62 },
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{ 31, 45, 61 },
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{ 46, 68, 77 },
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{ 6, 24, 76 },
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{ 8, 10, 78 },
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{ 40, 41, 70 },
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{ 17, 50, 53 },
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{ 42, 66, 68 },
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{ 4, 22, 72 },
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{ 36, 64, 81 },
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{ 13, 29, 47 },
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{ 2, 8, 81 },
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{ 56, 67, 73 },
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{ 5, 38, 50 },
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{ 12, 38, 64 },
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{ 59, 72, 80 },
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{ 3, 26, 79 },
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{ 45, 76, 81 },
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{ 1, 65, 74 },
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{ 7, 18, 77 },
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{ 11, 56, 59 },
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{ 14, 39, 54 },
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{ 16, 37, 66 },
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{ 10, 28, 55 },
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{ 15, 60, 70 },
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{ 17, 25, 82 },
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{ 20, 30, 31 },
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{ 12, 67, 68 },
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{ 23, 75, 80 },
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{ 27, 32, 62 },
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{ 24, 69, 75 },
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{ 19, 21, 71 },
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{ 34, 53, 61 },
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{ 35, 46, 47 },
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{ 33, 59, 76 },
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{ 40, 43, 83 },
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{ 41, 42, 63 },
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{ 49, 75, 83 },
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{ 20, 44, 48 },
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{ 42, 49, 57 },
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};
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} // namespace FT8
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