| /* -*- c++ -*- */ |
| /* @file |
| * @author Piotr Krysik <ptrkrysik@gmail.com> |
| * @section LICENSE |
| * |
| * Gr-gsm is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 3, or (at your option) |
| * any later version. |
| * |
| * Gr-gsm is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gr-gsm; see the file COPYING. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| //#include "grgsm/misc_utils/freq_hopping_utils.h" |
| #include <cmath> |
| |
| namespace gr { |
| namespace gsm { |
| unsigned char RNTABLE[114] = { |
| 48, 98, 63, 1, 36, 95, 78, 102, 94, 73, \ |
| 0, 64, 25, 81, 76, 59, 124, 23, 104, 100, \ |
| 101, 47, 118, 85, 18, 56, 96, 86, 54, 2, \ |
| 80, 34, 127, 13, 6, 89, 57, 103, 12, 74, \ |
| 55, 111, 75, 38, 109, 71, 112, 29, 11, 88, \ |
| 87, 19, 3, 68, 110, 26, 33, 31, 8, 45, \ |
| 82, 58, 40, 107, 32, 5, 106, 92, 62, 67, \ |
| 77, 108, 122, 37, 60, 66, 121, 42, 51, 126, \ |
| 117, 114, 4, 90, 43, 52, 53, 113, 120, 72, \ |
| 16, 49, 7, 79, 119, 61, 22, 84, 9, 97, \ |
| 91, 15, 21, 24, 46, 39, 93, 105, 65, 70, \ |
| 125, 99, 17, 123 \ |
| }; |
| |
| int calculate_ma_sfh(int maio, int hsn, int n, int fn) |
| { |
| int mai = 0; |
| int s = 0; |
| int nbin = floor(log2(n) + 1); |
| int t1 = fn / 1326; |
| int t2 = fn % 26; |
| int t3 = fn % 51; |
| |
| if (hsn == 0){ |
| mai = (fn + maio) % n; |
| } else { |
| int t1r = t1 % 64; |
| int m = t2 + RNTABLE[(hsn ^ t1r) + t3]; |
| int mprim = m % (1 << nbin); |
| int tprim = t3 % (1 << nbin); |
| |
| if (mprim < n){ |
| s = mprim; |
| } else { |
| s = (mprim + tprim) % n; |
| } |
| mai = (s + maio) % n; |
| } |
| return (mai); |
| } |
| } // namespace gsm |
| } // namespace gr |