/******************************************************************************* OpenAirInterface Copyright(c) 1999 - 2014 Eurecom OpenAirInterface 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 of the License, or (at your option) any later version. OpenAirInterface 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 OpenAirInterface.The full GNU General Public License is included in this distribution in the file called "COPYING". If not, see <http://www.gnu.org/licenses/>. Contact Information OpenAirInterface Admin: openair_admin@eurecom.fr OpenAirInterface Tech : openair_tech@eurecom.fr OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE *******************************************************************************/ /*! \file PHY/LTE_TRANSPORT/prach.c * \brief Top-level routines for generating and decoding the PRACH physical channel V8.6 2009-03 * \author R. Knopp * \date 2011 * \version 0.1 * \company Eurecom * \email: knopp@eurecom.fr * \note * \warning */ #include "PHY/sse_intrin.h" #include "PHY/defs.h" #include "PHY/extern.h" //#include "prach.h" #include "SCHED/defs.h" #include "SCHED/extern.h" #include "UTIL/LOG/vcd_signal_dumper.h" //#define PRACH_DEBUG 1 uint16_t NCS_unrestricted[16] = {0,13,15,18,22,26,32,38,46,59,76,93,119,167,279,419}; uint16_t NCS_restricted[15] = {15,18,22,26,32,38,46,55,68,82,100,128,158,202,237}; // high-speed case uint16_t NCS_4[7] = {2,4,6,8,10,12,15}; int16_t ru[2*839]; // quantized roots of unity uint32_t ZC_inv[839]; // multiplicative inverse for roots u uint16_t du[838]; typedef struct { uint8_t f_ra; uint8_t t0_ra; uint8_t t1_ra; uint8_t t2_ra; } PRACH_TDD_PREAMBLE_MAP_elem; typedef struct { uint8_t num_prach; PRACH_TDD_PREAMBLE_MAP_elem map[6]; } PRACH_TDD_PREAMBLE_MAP; // This is table 5.7.1-4 from 36.211 PRACH_TDD_PREAMBLE_MAP tdd_preamble_map[64][7] = { // TDD Configuration Index 0 { {1,{{0,1,0,2}}},{1,{{0,1,0,1}}}, {1,{{0,1,0,0}}}, {1,{{0,1,0,2}}}, {1,{{0,1,0,1}}}, {1,{{0,1,0,0}}}, {1,{{0,1,0,2}}}}, // TDD Configuration Index 1 { {1,{{0,2,0,2}}},{1,{{0,2,0,1}}}, {1,{{0,2,0,0}}}, {1,{{0,2,0,2}}}, {1,{{0,2,0,1}}}, {1,{{0,2,0,0}}}, {1,{{0,2,0,2}}}}, // TDD Configuration Index 2 { {1,{{0,1,1,2}}},{1,{{0,1,1,1}}}, {1,{{0,1,1,0}}}, {1,{{0,1,0,1}}}, {1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,1,1}}}}, // TDD Configuration Index 3 { {1,{{0,0,0,2}}},{1,{{0,0,0,1}}}, {1,{{0,0,0,0}}}, {1,{{0,0,0,2}}}, {1,{{0,0,0,1}}}, {1,{{0,0,0,0}}}, {1,{{0,0,0,2}}}}, // TDD Configuration Index 4 { {1,{{0,0,1,2}}},{1,{{0,0,1,1}}}, {1,{{0,0,1,0}}}, {1,{{0,0,0,1}}}, {1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,1,1}}}}, // TDD Configuration Index 5 { {1,{{0,0,0,1}}},{1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,1}}}}, // TDD Configuration Index 6 { {2,{{0,0,0,2},{0,0,1,2}}}, {2,{{0,0,0,1},{0,0,1,1}}}, {2,{{0,0,0,0},{0,0,1,0}}}, {2,{{0,0,0,1},{0,0,0,2}}}, {2,{{0,0,0,0},{0,0,0,1}}}, {2,{{0,0,0,0},{1,0,0,0}}}, {2,{{0,0,0,2},{0,0,1,1}}}}, // TDD Configuration Index 7 { {2,{{0,0,0,1},{0,0,1,1}}}, {2,{{0,0,0,0},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,0},{0,0,0,2}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,1},{0,0,1,0}}}}, // TDD Configuration Index 8 { {2,{{0,0,0,0},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,0},{0,0,0,1}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,0},{0,0,1,1}}}}, // TDD Configuration Index 9 { {3,{{0,0,0,1},{0,0,0,2},{0,0,1,2}}}, {3,{{0,0,0,0},{0,0,0,1},{0,0,1,1}}}, {3,{{0,0,0,0},{0,0,1,0},{1,0,0,0}}}, {3,{{0,0,0,0},{0,0,0,1},{0,0,0,2}}}, {3,{{0,0,0,0},{0,0,0,1},{1,0,0,1}}}, {3,{{0,0,0,0},{1,0,0,0},{2,0,0,0}}}, {3,{{0,0,0,1},{0,0,0,2},{0,0,1,1}}}}, // TDD Configuration Index 10 { {3,{{0,0,0,0},{0,0,1,0},{0,0,1,1}}}, {3,{{0,0,0,1},{0,0,1,0},{0,0,1,1}}}, {3,{{0,0,0,0},{0,0,1,0},{1,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,0},{0,0,0,1},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,0},{0,0,0,2},{0,0,1,0}}}}, // TDD Configuration Index 11 { {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,0},{0,0,0,1},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,1},{0,0,1,0},{0,0,1,1}}}}, // TDD Configuration Index 12 { {4,{{0,0,0,1},{0,0,0,2},{0,0,1,1},{0,0,1,2}}}, {4,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1}}}, {4,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0}}}, {4,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,2}}}, {4,{{0,0,0,0},{0,0,0,1},{1,0,0,0},{1,0,0,1}}}, {4,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0}}}, {4,{{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1}}} }, // TDD Configuration Index 13 { {4,{{0,0,0,0},{0,0,0,2},{0,0,1,0},{0,0,1,2}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,1}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,1}}} }, // TDD Configuration Index 14 { {4,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{0,0,0,2},{0,0,1,0},{0,0,1,1}}} }, // TDD Configuration Index 15 { {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,1},{0,0,1,2}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1},{1,0,0,1}}}, {5,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,1},{1,0,0,2}}}, {5,{{0,0,0,0},{0,0,0,1},{1,0,0,0},{1,0,0,1},{2,0,0,1}}}, {5,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1}}} }, // TDD Configuration Index 16 { {5,{{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1},{0,0,1,2}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1},{1,0,1,1}}}, {5,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,1,0}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,0},{1,0,0,2}}}, {5,{{0,0,0,0},{0,0,0,1},{1,0,0,0},{1,0,0,1},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}} }, // TDD Configuration Index 17 { {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,2}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {5,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,0},{1,0,0,1}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}} }, // TDD Configuration Index 18 { {6,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1},{0,0,1,2}}}, {6,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1},{1,0,0,1},{1,0,1,1}}}, {6,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0},{2,0,1,0}}}, {6,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{1,0,0,0},{1,0,0,1},{1,0,0,2}}}, {6,{{0,0,0,0},{0,0,0,1},{1,0,0,0},{1,0,0,1},{2,0,0,0},{2,0,0,1}}}, {6,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0},{5,0,0,0}}}, {6,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1},{1,0,0,2}}} }, // TDD Configuration Index 19 { {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,0},{0,0,0,1},{0,0,1,0},{0,0,1,1},{1,0,0,0},{1,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,0},{0,0,0,1},{0,0,0,2},{0,0,1,0},{0,0,1,1},{1,0,1,1}}} }, // TDD Configuration Index 20 { {1,{{0,1,0,1}}},{1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,1}}}, {1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,1}}}}, // TDD Configuration Index 21 { {1,{{0,2,0,1}}},{1,{{0,2,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,1}}}, {1,{{0,2,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,1}}}}, // TDD Configuration Index 22 { {1,{{0,1,1,1}}},{1,{{0,1,1,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,1,0}}}}, // TDD Configuration Index 23 { {1,{{0,0,0,1}}},{1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,1}}}, {1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,1}}}}, // TDD Configuration Index 24 { {1,{{0,0,1,1}}},{1,{{0,0,1,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,1,0}}}}, // TDD Configuration Index 25 { {2,{{0,0,0,1},{0,0,1,1}}}, {2,{{0,0,0,0},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,1},{1,0,0,1}}}, {2,{{0,0,0,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,1},{0,0,1,0}}}}, // TDD Configuration Index 26 { {3,{{0,0,0,1},{0,0,1,1},{1,0,0,1}}}, {3,{{0,0,0,0},{0,0,1,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,1},{1,0,0,1},{2,0,0,1}}}, {3,{{0,0,0,0},{1,0,0,0},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,1},{0,0,1,0},{1,0,0,1}}}}, // TDD Configuration Index 27 { {4,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1}}}, {4,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1}}}, {4,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0}}} }, // TDD Configuration Index 28 { {5,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1},{2,0,0,1}}}, {5,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {5,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1},{4,0,0,1}}}, {5,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {5,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0},{2,0,0,1}}} }, // TDD Configuration Index 29 { {6,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1},{2,0,0,1},{2,0,1,1}}}, {6,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0},{2,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1},{4,0,0,1},{5,0,0,1}}}, {6,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0},{5,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0},{2,0,0,1},{2,0,1,0}}} }, // TDD Configuration Index 30 { {1,{{0,1,0,1}}},{1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,1}}}, {1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,1}}}}, // TDD Configuration Index 31 { {1,{{0,2,0,1}}},{1,{{0,2,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,1}}}, {1,{{0,2,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,1}}}}, // TDD Configuration Index 32 { {1,{{0,1,1,1}}},{1,{{0,1,1,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,1,0}}}}, // TDD Configuration Index 33 { {1,{{0,0,0,1}}},{1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,1}}}, {1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,1}}}}, // TDD Configuration Index 34 { {1,{{0,0,1,1}}},{1,{{0,0,1,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,1,0}}}}, // TDD Configuration Index 35 { {2,{{0,0,0,1},{0,0,1,1}}}, {2,{{0,0,0,0},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,1},{1,0,0,1}}}, {2,{{0,0,0,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,1},{0,0,1,0}}}}, // TDD Configuration Index 36 { {3,{{0,0,0,1},{0,0,1,1},{1,0,0,1}}}, {3,{{0,0,0,0},{0,0,1,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,1},{1,0,0,1},{2,0,0,1}}}, {3,{{0,0,0,0},{1,0,0,0},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,1},{0,0,1,0},{1,0,0,1}}}}, // TDD Configuration Index 37 { {4,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1}}}, {4,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1}}}, {4,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0}}} }, // TDD Configuration Index 38 { {5,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1},{2,0,0,1}}}, {5,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {5,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1},{4,0,0,1}}}, {5,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {5,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0},{2,0,0,1}}} }, // TDD Configuration Index 39 { {6,{{0,0,0,1},{0,0,1,1},{1,0,0,1},{1,0,1,1},{2,0,0,1},{2,0,1,1}}}, {6,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0},{2,0,0,0},{2,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,1},{1,0,0,1},{2,0,0,1},{3,0,0,1},{4,0,0,1},{5,0,0,1}}}, {6,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0},{4,0,0,0},{5,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {6,{{0,0,0,1},{0,0,1,0},{1,0,0,1},{1,0,1,0},{2,0,0,1},{2,0,1,0}}} }, // TDD Configuration Index 40 { {1,{{0,1,0,0}}},{0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,1,0,0}}}}, // TDD Configuration Index 41 { {1,{{0,2,0,0}}},{0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,2,0,0}}}}, // TDD Configuration Index 42 { {1,{{0,1,1,0}}},{0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}}, // TDD Configuration Index 43 { {1,{{0,0,0,0}}},{0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {1,{{0,0,0,0}}}}, // TDD Configuration Index 44 { {1,{{0,0,1,0}}},{0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}, {0,{{0,0,0,0}}}}, // TDD Configuration Index 45 { {2,{{0,0,0,0},{0,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0}}}, {2,{{0,0,0,0},{1,0,0,0}}}}, // TDD Configuration Index 46 { {3,{{0,0,0,0},{0,0,1,0},{1,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,0},{1,0,0,0},{2,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {3,{{0,0,0,0},{1,0,0,0},{2,0,0,0}}}}, // TDD Configuration Index 47 { {4,{{0,0,0,0},{0,0,1,0},{1,0,0,0},{1,0,1,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}}}, {4,{{0,0,0,0},{1,0,0,0},{2,0,0,0},{3,0,0,0}}} } }; uint16_t prach_root_sequence_map0_3[838] = { 129, 710, 140, 699, 120, 719, 210, 629, 168, 671, 84, 755, 105, 734, 93, 746, 70, 769, 60, 779, 2, 837, 1, 838, 56, 783, 112, 727, 148, 691, 80, 759, 42, 797, 40, 799, 35, 804, 73, 766, 146, 693, 31, 808, 28, 811, 30, 809, 27, 812, 29, 810, 24, 815, 48, 791, 68, 771, 74, 765, 178, 661, 136, 703, 86, 753, 78, 761, 43, 796, 39, 800, 20, 819, 21, 818, 95, 744, 202, 637, 190, 649, 181, 658, 137, 702, 125, 714, 151, 688, 217, 622, 128, 711, 142, 697, 122, 717, 203, 636, 118, 721, 110, 729, 89, 750, 103, 736, 61, 778, 55, 784, 15, 824, 14, 825, 12, 827, 23, 816, 34, 805, 37, 802, 46, 793, 207, 632, 179, 660, 145, 694, 130, 709, 223, 616, 228, 611, 227, 612, 132, 707, 133, 706, 143, 696, 135, 704, 161, 678, 201, 638, 173, 666, 106, 733, 83, 756, 91, 748, 66, 773, 53, 786, 10, 829, 9, 830, 7, 832, 8, 831, 16, 823, 47, 792, 64, 775, 57, 782, 104, 735, 101, 738, 108, 731, 208, 631, 184, 655, 197, 642, 191, 648, 121, 718, 141, 698, 149, 690, 216, 623, 218, 621, 152, 687, 144, 695, 134, 705, 138, 701, 199, 640, 162, 677, 176, 663, 119, 720, 158, 681, 164, 675, 174, 665, 171, 668, 170, 669, 87, 752, 169, 670, 88, 751, 107, 732, 81, 758, 82, 757, 100, 739, 98, 741, 71, 768, 59, 780, 65, 774, 50, 789, 49, 790, 26, 813, 17, 822, 13, 826, 6, 833, 5, 834, 33, 806, 51, 788, 75, 764, 99, 740, 96, 743, 97, 742, 166, 673, 172, 667, 175, 664, 187, 652, 163, 676, 185, 654, 200, 639, 114, 725, 189, 650, 115, 724, 194, 645, 195, 644, 192, 647, 182, 657, 157, 682, 156, 683, 211, 628, 154, 685, 123, 716, 139, 700, 212, 627, 153, 686, 213, 626, 215, 624, 150, 689, 225, 614, 224, 615, 221, 618, 220, 619, 127, 712, 147, 692, 124, 715, 193, 646, 205, 634, 206, 633, 116, 723, 160, 679, 186, 653, 167, 672, 79, 760, 85, 754, 77, 762, 92, 747, 58, 781, 62, 777, 69, 770, 54, 785, 36, 803, 32, 807, 25, 814, 18, 821, 11, 828, 4, 835, 3, 836, 19, 820, 22, 817, 41, 798, 38, 801, 44, 795, 52, 787, 45, 794, 63, 776, 67, 772, 72, 767, 76, 763, 94, 745, 102, 737, 90, 749, 109, 730, 165, 674, 111, 728, 209, 630, 204, 635, 117, 722, 188, 651, 159, 680, 198, 641, 113, 726, 183, 656, 180, 659, 177, 662, 196, 643, 155, 684, 214, 625, 126, 713, 131, 708, 219, 620, 222, 617, 226, 613, 230, 609, 232, 607, 262, 577, 252, 587, 418, 421, 416, 423, 413, 426, 411, 428, 376, 463, 395, 444, 283, 556, 285, 554, 379, 460, 390, 449, 363, 476, 384, 455, 388, 451, 386, 453, 361, 478, 387, 452, 360, 479, 310, 529, 354, 485, 328, 511, 315, 524, 337, 502, 349, 490, 335, 504, 324, 515, 323, 516, 320, 519, 334, 505, 359, 480, 295, 544, 385, 454, 292, 547, 291, 548, 381, 458, 399, 440, 380, 459, 397, 442, 369, 470, 377, 462, 410, 429, 407, 432, 281, 558, 414, 425, 247, 592, 277, 562, 271, 568, 272, 567, 264, 575, 259, 580, 237, 602, 239, 600, 244, 595, 243, 596, 275, 564, 278, 561, 250, 589, 246, 593, 417, 422, 248, 591, 394, 445, 393, 446, 370, 469, 365, 474, 300, 539, 299, 540, 364, 475, 362, 477, 298, 541, 312, 527, 313, 526, 314, 525, 353, 486, 352, 487, 343, 496, 327, 512, 350, 489, 326, 513, 319, 520, 332, 507, 333, 506, 348, 491, 347, 492, 322, 517, 330, 509, 338, 501, 341, 498, 340, 499, 342, 497, 301, 538, 366, 473, 401, 438, 371, 468, 408, 431, 375, 464, 249, 590, 269, 570, 238, 601, 234, 605, 257, 582, 273, 566, 255, 584, 254, 585, 245, 594, 251, 588, 412, 427, 372, 467, 282, 557, 403, 436, 396, 443, 392, 447, 391, 448, 382, 457, 389, 450, 294, 545, 297, 542, 311, 528, 344, 495, 345, 494, 318, 521, 331, 508, 325, 514, 321, 518, 346, 493, 339, 500, 351, 488, 306, 533, 289, 550, 400, 439, 378, 461, 374, 465, 415, 424, 270, 569, 241, 598, 231, 608, 260, 579, 268, 571, 276, 563, 409, 430, 398, 441, 290, 549, 304, 535, 308, 531, 358, 481, 316, 523, 293, 546, 288, 551, 284, 555, 368, 471, 253, 586, 256, 583, 263, 576, 242, 597, 274, 565, 402, 437, 383, 456, 357, 482, 329, 510, 317, 522, 307, 532, 286, 553, 287, 552, 266, 573, 261, 578, 236, 603, 303, 536, 356, 483, 355, 484, 405, 434, 404, 435, 406, 433, 235, 604, 267, 572, 302, 537, 309, 530, 265, 574, 233, 606, 367, 472, 296, 543, 336, 503, 305, 534, 373, 466, 280, 559, 279, 560, 419, 420, 240, 599, 258, 581, 229, 610 }; uint16_t prach_root_sequence_map4[138] = { 1,138,2,137,3,136,4,135,5,134,6,133,7,132,8,131,9,130,10,129, 11,128,12,127,13,126,14,125,15,124,16,123,17,122,18,121,19,120,20,119, 21,118,22,117,23,116,24,115,25,114,26,113,27,112,28,111,29,110,30,109, 31,108,32,107,33,106,34,105,35,104,36,103,37,102,38,101,39,100,40,99, 41,98,42,97,43,96,44,95,45,94,46,93,47,92,48,91,49,90,50,89, 51,88,52,87,53,86,54,85,55,84,56,83,57,82,58,81,59,80,60,79, 61,78,62,77,63,76,64,75,65,74,66,73,67,72,68,71,69,70 }; #ifdef USER_MODE void dump_prach_config(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe) { FILE *fd; fd = fopen("prach_config.txt","w"); fprintf(fd,"prach_config: subframe = %d\n",subframe); fprintf(fd,"prach_config: N_RB_UL = %d\n",frame_parms->N_RB_UL); fprintf(fd,"prach_config: frame_type = %s\n",(frame_parms->frame_type==1) ? "TDD":"FDD"); if(frame_parms->frame_type==1) fprintf(fd,"prach_config: tdd_config = %d\n",frame_parms->tdd_config); fprintf(fd,"prach_config: rootSequenceIndex = %d\n",frame_parms->prach_config_common.rootSequenceIndex); fprintf(fd,"prach_config: prach_ConfigIndex = %d\n",frame_parms->prach_config_common.prach_ConfigInfo.prach_ConfigIndex); fprintf(fd,"prach_config: Ncs_config = %d\n",frame_parms->prach_config_common.prach_ConfigInfo.zeroCorrelationZoneConfig); fprintf(fd,"prach_config: highSpeedFlag = %d\n",frame_parms->prach_config_common.prach_ConfigInfo.highSpeedFlag); fprintf(fd,"prach_config: n_ra_prboffset = %d\n",frame_parms->prach_config_common.prach_ConfigInfo.prach_FreqOffset); fclose(fd); } #endif // This function computes the du void fill_du(uint8_t prach_fmt) { uint16_t iu,u,p; uint16_t N_ZC; uint16_t *prach_root_sequence_map; if (prach_fmt<4) { N_ZC = 839; prach_root_sequence_map = prach_root_sequence_map0_3; } else { N_ZC = 139; prach_root_sequence_map = prach_root_sequence_map4; } for (iu=0; iu<(N_ZC-1); iu++) { u=prach_root_sequence_map[iu]; p=1; while (((u*p)%N_ZC)!=1) p++; du[u] = ((p<(N_ZC>>1)) ? p : (N_ZC-p)); } } uint8_t get_num_prach_tdd(LTE_DL_FRAME_PARMS *frame_parms) { return(tdd_preamble_map[frame_parms->prach_config_common.prach_ConfigInfo.prach_ConfigIndex][frame_parms->tdd_config].num_prach); } uint8_t get_fid_prach_tdd(LTE_DL_FRAME_PARMS *frame_parms,uint8_t tdd_map_index) { return(tdd_preamble_map[frame_parms->prach_config_common.prach_ConfigInfo.prach_ConfigIndex][frame_parms->tdd_config].map[tdd_map_index].f_ra); } uint8_t get_prach_fmt(uint8_t prach_ConfigIndex,lte_frame_type_t frame_type) { if (frame_type == FDD) // FDD return(prach_ConfigIndex>>4); else { if (prach_ConfigIndex < 20) return (0); if (prach_ConfigIndex < 30) return (1); if (prach_ConfigIndex < 40) return (2); if (prach_ConfigIndex < 48) return (3); else return (4); } } uint8_t get_prach_prb_offset(LTE_DL_FRAME_PARMS *frame_parms, uint8_t tdd_mapindex, uint16_t Nf) { lte_frame_type_t frame_type = frame_parms->frame_type; uint8_t tdd_config = frame_parms->tdd_config; uint8_t prach_ConfigIndex = frame_parms->prach_config_common.prach_ConfigInfo.prach_ConfigIndex; uint8_t n_ra_prboffset = frame_parms->prach_config_common.prach_ConfigInfo.prach_FreqOffset; uint8_t n_ra_prb; uint8_t f_ra,t1_ra; uint8_t prach_fmt = get_prach_fmt(prach_ConfigIndex,frame_type); uint8_t Nsp=2; if (frame_type == TDD) { // TDD if (tdd_preamble_map[prach_ConfigIndex][tdd_config].num_prach==0) { LOG_E(PHY, "Illegal prach_ConfigIndex %"PRIu8"", prach_ConfigIndex); return(-1); } // adjust n_ra_prboffset for frequency multiplexing (p.36 36.211) f_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[tdd_mapindex].f_ra; if (prach_fmt < 4) { if ((f_ra&1) == 0) { n_ra_prb = n_ra_prboffset + 6*(f_ra>>1); } else { n_ra_prb = frame_parms->N_RB_UL - 6 - n_ra_prboffset + 6*(f_ra>>1); } } else { if ((tdd_config >2) && (tdd_config<6)) Nsp = 2; t1_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[0].t1_ra; if ((((Nf&1)*(2-Nsp)+t1_ra)&1) == 0) { n_ra_prb = 6*f_ra; } else { n_ra_prb = frame_parms->N_RB_UL - 6*(f_ra+1); } } } else { //FDD n_ra_prb = n_ra_prboffset; } return(n_ra_prb); } int is_prach_subframe(LTE_DL_FRAME_PARMS *frame_parms,uint32_t frame, uint8_t subframe) { uint8_t prach_ConfigIndex = frame_parms->prach_config_common.prach_ConfigInfo.prach_ConfigIndex; uint8_t tdd_config = frame_parms->tdd_config; uint8_t t0_ra; uint8_t t1_ra; uint8_t t2_ra; if (frame_parms->frame_type == FDD) { //FDD //implement Table 5.7.1-2 from 36.211 (Rel-10, p.41) if ((((frame&1) == 1) && (subframe < 9)) || (((frame&1) == 0) && (subframe == 9))) // This is an odd frame, ignore even-only PRACH frames if (((prach_ConfigIndex&0xf)<3) || // 0,1,2,16,17,18,32,33,34,48,49,50 ((prach_ConfigIndex&0x1f)==18) || // 18,50 ((prach_ConfigIndex&0xf)==15)) // 15,47 return(0); switch (prach_ConfigIndex&0x1f) { case 0: case 3: return(subframe==1); break; case 1: case 4: return(subframe==4); break; case 2: case 5: return(subframe==7); break; case 6: return((subframe==1) || (subframe==6)); break; case 7: return((subframe==2) || (subframe==7)); break; case 8: return((subframe==3) || (subframe==8)); break; case 9: return((subframe==1) || (subframe==4) || (subframe==7)); break; case 10: return((subframe==2) || (subframe==5) || (subframe==8)); break; case 11: return((subframe==3) || (subframe==6) || (subframe==9)); break; case 12: return((subframe&1)==0); break; case 13: return((subframe&1)==1); break; case 14: return(1==1); break; case 15: return(subframe==9); break; } } else { // TDD if (prach_ConfigIndex>=64) { LOG_E(PHY,"[PHY] Illegal prach_ConfigIndex %d for ",prach_ConfigIndex); return(0); } if (tdd_preamble_map[prach_ConfigIndex][tdd_config].num_prach==0) { LOG_E(PHY,"[PHY] Illegal prach_ConfigIndex %d for ",prach_ConfigIndex); return(0); } t0_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[0].t0_ra; t1_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[0].t1_ra; t2_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[0].t2_ra; #ifdef PRACH_DEBUG LOG_D(PHY,"[PRACH] Checking for PRACH format (ConfigIndex %d) in TDD subframe %d (%d,%d,%d)\n", prach_ConfigIndex, subframe, t0_ra,t1_ra,t2_ra); #endif if ((((t0_ra == 1) && ((frame &1)==0))|| // frame is even and PRACH is in even frames ((t0_ra == 2) && ((frame &1)==1))|| // frame is odd and PRACH is in odd frames (t0_ra == 0)) && // PRACH is in all frames (((subframe<5)&&(t1_ra==0)) || // PRACH is in 1st half-frame (((subframe>4)&&(t1_ra==1))))) { // PRACH is in 2nd half-frame if (prach_ConfigIndex<48) // PRACH only in normal UL subframe return((((subframe%5)-2)==t2_ra)); else // PRACH can be in UpPTS return((((subframe%5)-1)==t2_ra)); } else return(1==2); } // shouldn't get here! return(2==1); } int32_t generate_prach( PHY_VARS_UE *phy_vars_ue, uint8_t eNB_id, uint8_t subframe, uint16_t Nf ) { lte_frame_type_t frame_type = phy_vars_ue->lte_frame_parms.frame_type; //uint8_t tdd_config = phy_vars_ue->lte_frame_parms.tdd_config; uint16_t rootSequenceIndex = phy_vars_ue->lte_frame_parms.prach_config_common.rootSequenceIndex; uint8_t prach_ConfigIndex = phy_vars_ue->lte_frame_parms.prach_config_common.prach_ConfigInfo.prach_ConfigIndex; uint8_t Ncs_config = phy_vars_ue->lte_frame_parms.prach_config_common.prach_ConfigInfo.zeroCorrelationZoneConfig; uint8_t restricted_set = phy_vars_ue->lte_frame_parms.prach_config_common.prach_ConfigInfo.highSpeedFlag; //uint8_t n_ra_prboffset = phy_vars_ue->lte_frame_parms.prach_config_common.prach_ConfigInfo.prach_FreqOffset; uint8_t preamble_index = phy_vars_ue->prach_resources[eNB_id]->ra_PreambleIndex; uint8_t tdd_mapindex = phy_vars_ue->prach_resources[eNB_id]->ra_TDD_map_index; int16_t *prachF = phy_vars_ue->lte_ue_prach_vars[eNB_id]->prachF; static int16_t prach_tmp[45600*2] __attribute__((aligned(32))); int16_t *prach = prach_tmp; int16_t *prach2; int16_t amp = phy_vars_ue->lte_ue_prach_vars[eNB_id]->amp; int16_t Ncp; uint8_t n_ra_prb; uint16_t NCS; uint16_t *prach_root_sequence_map; uint16_t preamble_offset,preamble_shift; uint16_t preamble_index0,n_shift_ra,n_shift_ra_bar; uint16_t d_start,numshift; uint8_t prach_fmt = get_prach_fmt(prach_ConfigIndex,frame_type); //uint8_t Nsp=2; //uint8_t f_ra,t1_ra; uint16_t N_ZC = (prach_fmt<4)?839:139; uint8_t not_found; int k; int16_t *Xu; uint16_t u; int32_t Xu_re,Xu_im; uint16_t offset,offset2; int prach_start; int i, prach_len; uint16_t first_nonzero_root_idx=0; #ifdef BIT8_TX prach_start = ((subframe*phy_vars_ue->lte_frame_parms.samples_per_tti)<<1)-phy_vars_ue->N_TA_offset; #else #if defined(EXMIMO) || defined(OAI_USRP) prach_start = (phy_vars_ue->rx_offset+subframe*phy_vars_ue->lte_frame_parms.samples_per_tti-openair_daq_vars.timing_advance-phy_vars_ue->N_TA_offset); if (prach_start<0) prach_start+=(phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME); if (prach_start>=(phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME)) prach_start-=(phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME); #else //normal case (simulation) prach_start = subframe*phy_vars_ue->lte_frame_parms.samples_per_tti-phy_vars_ue->N_TA_offset; #endif #endif // First compute physical root sequence if (restricted_set == 0) { if (Ncs_config > 15) { LOG_E( PHY, "[PHY] FATAL, Illegal Ncs_config for unrestricted format %"PRIu8"\n", Ncs_config ); mac_xface->macphy_exit("PRACH: Illegal Ncs_config for unrestricted format"); return 0; // not reached } NCS = NCS_unrestricted[Ncs_config]; } else { if (Ncs_config > 14) { LOG_E( PHY, "[PHY] FATAL, Illegal Ncs_config for restricted format %"PRIu8"\n", Ncs_config ); mac_xface->macphy_exit("PRACH: Illegal Ncs_config for restricted format"); return 0; // not reached } NCS = NCS_restricted[Ncs_config]; } n_ra_prb = get_prach_prb_offset(&(phy_vars_ue->lte_frame_parms), tdd_mapindex, Nf); prach_root_sequence_map = (prach_fmt<4) ? prach_root_sequence_map0_3 : prach_root_sequence_map4; /* // this code is not part of get_prach_prb_offset if (frame_type == TDD) { // TDD if (tdd_preamble_map[prach_ConfigIndex][tdd_config].num_prach==0) { LOG_E( PHY, "[PHY][UE %"PRIu8"] Illegal prach_ConfigIndex %"PRIu8" for ", phy_vars_ue->Mod_id, prach_ConfigIndex ); } // adjust n_ra_prboffset for frequency multiplexing (p.36 36.211) f_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[tdd_mapindex].f_ra; if (prach_fmt < 4) { if ((f_ra&1) == 0) { n_ra_prb = n_ra_prboffset + 6*(f_ra>>1); } else { n_ra_prb = phy_vars_ue->lte_frame_parms.N_RB_UL - 6 - n_ra_prboffset + 6*(f_ra>>1); } } else { if ((tdd_config >2) && (tdd_config<6)) Nsp = 2; t1_ra = tdd_preamble_map[prach_ConfigIndex][tdd_config].map[0].t1_ra; if ((((Nf&1)*(2-Nsp)+t1_ra)&1) == 0) { n_ra_prb = 6*f_ra; } else { n_ra_prb = phy_vars_ue->lte_frame_parms.N_RB_UL - 6*(f_ra+1); } } } */ // This is the relative offset (for unrestricted case) in the root sequence table (5.7.2-4 from 36.211) for the given preamble index preamble_offset = ((NCS==0)? preamble_index : (preamble_index/(N_ZC/NCS))); if (restricted_set == 0) { // This is the \nu corresponding to the preamble index preamble_shift = (NCS==0)? 0 : (preamble_index % (N_ZC/NCS)); preamble_shift *= NCS; } else { // This is the high-speed case #ifdef PRACH_DEBUG LOG_D(PHY,"[UE %d] High-speed mode, NCS_config %d\n",phy_vars_ue->Mod_id,Ncs_config); #endif not_found = 1; preamble_index0 = preamble_index; // set preamble_offset to initial rootSequenceIndex and look if we need more root sequences for this // preamble index and find the corresponding cyclic shift preamble_offset = 0; // relative rootSequenceIndex; while (not_found == 1) { // current root depending on rootSequenceIndex and preamble_offset int index = (rootSequenceIndex + preamble_offset) % N_ZC; if (prach_fmt<4) { // prach_root_sequence_map points to prach_root_sequence_map0_3 DevAssert( index < sizeof(prach_root_sequence_map0_3) / sizeof(prach_root_sequence_map0_3[0]) ); } else { // prach_root_sequence_map points to prach_root_sequence_map4 DevAssert( index < sizeof(prach_root_sequence_map4) / sizeof(prach_root_sequence_map4[0]) ); } u = prach_root_sequence_map[index]; uint16_t n_group_ra = 0; if ( (du[u]<(N_ZC/3)) && (du[u]>=NCS) ) { n_shift_ra = du[u]/NCS; d_start = (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = N_ZC/d_start; n_shift_ra_bar = max(0,(N_ZC-(du[u]<<1)-(n_group_ra*d_start))/N_ZC); } else if ( (du[u]>=(N_ZC/3)) && (du[u]<=((N_ZC - NCS)>>1)) ) { n_shift_ra = (N_ZC - (du[u]<<1))/NCS; d_start = N_ZC - (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = du[u]/d_start; n_shift_ra_bar = min(n_shift_ra,max(0,(du[u]- (n_group_ra*d_start))/NCS)); } else { n_shift_ra = 0; n_shift_ra_bar = 0; } // This is the number of cyclic shifts for the current root u numshift = (n_shift_ra*n_group_ra) + n_shift_ra_bar; if (numshift>0 && preamble_index0==preamble_index) first_nonzero_root_idx = preamble_offset; if (preamble_index0 < numshift) { not_found = 0; preamble_shift = (d_start * (preamble_index0/n_shift_ra)) + ((preamble_index0%n_shift_ra)*NCS); } else { // skip to next rootSequenceIndex and recompute parameters preamble_offset++; preamble_index0 -= numshift; } } } // now generate PRACH signal #ifdef PRACH_DEBUG if (NCS>0) LOG_D(PHY,"Generate PRACH for RootSeqIndex %d, Preamble Index %d, NCS %d (NCS_config %d, N_ZC/NCS %d) n_ra_prb %d: Preamble_offset %d, Preamble_shift %d\n", rootSequenceIndex,preamble_index,NCS,Ncs_config,N_ZC/NCS,n_ra_prb, preamble_offset,preamble_shift); #endif // nsymb = (frame_parms->Ncp==0) ? 14:12; // subframe_offset = (unsigned int)frame_parms->ofdm_symbol_size*subframe*nsymb; k = (12*n_ra_prb) - 6*phy_vars_ue->lte_frame_parms.N_RB_UL; if (k<0) k+=phy_vars_ue->lte_frame_parms.ofdm_symbol_size; k*=12; k+=13; Xu = (int16_t*)phy_vars_ue->X_u[preamble_offset-first_nonzero_root_idx]; /* k+=(12*phy_vars_ue->lte_frame_parms.first_carrier_offset); if (k>(12*phy_vars_ue->lte_frame_parms.ofdm_symbol_size)) k-=(12*phy_vars_ue->lte_frame_parms.ofdm_symbol_size); */ k*=2; switch (phy_vars_ue->lte_frame_parms.N_RB_UL) { case 6: memset((void*)prachF,0,4*1536); break; case 15: memset((void*)prachF,0,4*3072); break; case 25: memset((void*)prachF,0,4*6144); break; case 50: memset((void*)prachF,0,4*12288); break; case 75: memset((void*)prachF,0,4*19432); break; case 100: memset((void*)prachF,0,4*24576); break; } for (offset=0,offset2=0; offset<N_ZC; offset++,offset2+=preamble_shift) { if (offset2 >= N_ZC) offset2 -= N_ZC; Xu_re = (((int32_t)Xu[offset<<1]*amp)>>15); Xu_im = (((int32_t)Xu[1+(offset<<1)]*amp)>>15); prachF[k++]= ((Xu_re*ru[offset2<<1]) - (Xu_im*ru[1+(offset2<<1)]))>>15; prachF[k++]= ((Xu_im*ru[offset2<<1]) + (Xu_re*ru[1+(offset2<<1)]))>>15; if (k==(12*2*phy_vars_ue->lte_frame_parms.ofdm_symbol_size)) k=0; } switch (prach_fmt) { case 0: Ncp = 3168; break; case 1: case 3: Ncp = 21024; break; case 2: Ncp = 6240; break; case 4: Ncp = 448; break; default: Ncp = 3168; break; } switch (phy_vars_ue->lte_frame_parms.N_RB_UL) { case 6: Ncp>>=4; prach+=4; // makes prach2 aligned to 128-bit break; case 15: Ncp>>=3; break; case 25: Ncp>>=2; break; case 50: Ncp>>=1; break; case 75: Ncp=(Ncp*3)>>2; break; } prach2 = prach+(Ncp<<1); // do IDFT switch (phy_vars_ue->lte_frame_parms.N_RB_UL) { case 6: if (prach_fmt == 4) { idft256(prachF,prach2,1); memmove( prach, prach+512, Ncp<<2 ); prach_len = 256+Ncp; } else { idft1536(prachF,prach2,1); memmove( prach, prach+3072, Ncp<<2 ); prach_len = 1536+Ncp; if (prach_fmt>1) { memmove( prach2+3072, prach2, 6144 ); prach_len = 2*1536+Ncp; } } break; case 15: if (prach_fmt == 4) { idft512(prachF,prach2,1); //TODO: account for repeated format in dft output memmove( prach, prach+1024, Ncp<<2 ); prach_len = 512+Ncp; } else { idft3072(prachF,prach2); memmove( prach, prach+6144, Ncp<<2 ); prach_len = 3072+Ncp; if (prach_fmt>1) { memmove( prach2+6144, prach2, 12288 ); prach_len = 2*3072+Ncp; } } break; case 25: default: if (prach_fmt == 4) { idft1024(prachF,prach2,1); memmove( prach, prach+2048, Ncp<<2 ); prach_len = 1024+Ncp; } else { idft6144(prachF,prach2); /*for (i=0;i<6144*2;i++) prach2[i]<<=1;*/ memmove( prach, prach+12288, Ncp<<2 ); prach_len = 6144+Ncp; if (prach_fmt>1) { memmove( prach2+12288, prach2, 24576 ); prach_len = 2*6144+Ncp; } } break; case 50: if (prach_fmt == 4) { idft2048(prachF,prach2,1); memmove( prach, prach+4096, Ncp<<2 ); prach_len = 2048+Ncp; } else { idft12288(prachF,prach2); memmove( prach, prach+24576, Ncp<<2 ); prach_len = 12288+Ncp; if (prach_fmt>1) { memmove( prach2+24576, prach2, 49152 ); prach_len = 2*12288+Ncp; } } break; case 75: if (prach_fmt == 4) { idft3072(prachF,prach2); //TODO: account for repeated format in dft output memmove( prach, prach+6144, Ncp<<2 ); prach_len = 3072+Ncp; } else { idft18432(prachF,prach2); memmove( prach, prach+36864, Ncp<<2 ); prach_len = 18432+Ncp; if (prach_fmt>1) { memmove( prach2+36834, prach2, 73728 ); prach_len = 2*18432+Ncp; } } break; case 100: if (prach_fmt == 4) { idft4096(prachF,prach2,1); memmove( prach, prach+8192, Ncp<<2 ); prach_len = 4096+Ncp; } else { idft24576(prachF,prach2); memmove( prach, prach+49152, Ncp<<2 ); prach_len = 24576+Ncp; if (prach_fmt>1) { memmove( prach2+49152, prach2, 98304 ); prach_len = 2* 24576+Ncp; } } break; } //LOG_D(PHY,"prach_len=%d\n",prach_len); if (prach_fmt==4) { LOG_E( PHY, "prach_fmt4 not fully implemented" ); mac_xface->macphy_exit("prach_fmt4 not fully implemented"); return 0; // not reached } else { #if defined(EXMIMO) || defined(OAI_USRP) int j; int overflow = prach_start + prach_len - LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_ue->lte_frame_parms.samples_per_tti; LOG_D( PHY, "prach_start=%d, overflow=%d\n", prach_start, overflow ); for (i=prach_start,j=0; i<min(phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME,prach_start+prach_len); i++,j++) { ((int16_t*)phy_vars_ue->lte_ue_common_vars.txdata[0])[2*i] = prach[2*j]<<4; ((int16_t*)phy_vars_ue->lte_ue_common_vars.txdata[0])[2*i+1] = prach[2*j+1]<<4; } for (i=0; i<overflow; i++,j++) { ((int16_t*)phy_vars_ue->lte_ue_common_vars.txdata[0])[2*i] = prach[2*j]<<4; ((int16_t*)phy_vars_ue->lte_ue_common_vars.txdata[0])[2*i+1] = prach[2*j+1]<<4; } #if defined(EXMIMO) // handle switch before 1st TX subframe, guarantee that the slot prior to transmission is switch on for (k=prach_start - (phy_vars_ue->lte_frame_parms.samples_per_tti>>1) ; k<prach_start ; k++) { if (k<0) phy_vars_ue->lte_ue_common_vars.txdata[0][k+phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME] &= 0xFFFEFFFE; else if (k>(phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME)) phy_vars_ue->lte_ue_common_vars.txdata[0][k-phy_vars_ue->lte_frame_parms.samples_per_tti*LTE_NUMBER_OF_SUBFRAMES_PER_FRAME] &= 0xFFFEFFFE; else phy_vars_ue->lte_ue_common_vars.txdata[0][k] &= 0xFFFEFFFE; } #endif #else for (i=0; i<prach_len; i++) { ((int16_t*)(&phy_vars_ue->lte_ue_common_vars.txdata[0][prach_start]))[2*i] = prach[2*i]; ((int16_t*)(&phy_vars_ue->lte_ue_common_vars.txdata[0][prach_start]))[2*i+1] = prach[2*i+1]; } #endif } #ifdef PRACH_DEBUG write_output("prach_txF0.m","prachtxF0",prachF,prach_len-Ncp,1,1); write_output("prach_tx0.m","prachtx0",prach+(Ncp<<1),prach_len-Ncp,1,1); #endif return signal_energy( (int*)prach, 256 ); } //__m128i mmtmpX0,mmtmpX1,mmtmpX2,mmtmpX3; void rx_prach(PHY_VARS_eNB *phy_vars_eNB, uint8_t subframe, uint16_t *preamble_energy_list, uint16_t *preamble_delay_list, uint16_t Nf, uint8_t tdd_mapindex) { int i; lte_frame_type_t frame_type = phy_vars_eNB->lte_frame_parms.frame_type; uint16_t rootSequenceIndex = phy_vars_eNB->lte_frame_parms.prach_config_common.rootSequenceIndex; uint8_t prach_ConfigIndex = phy_vars_eNB->lte_frame_parms.prach_config_common.prach_ConfigInfo.prach_ConfigIndex; uint8_t Ncs_config = phy_vars_eNB->lte_frame_parms.prach_config_common.prach_ConfigInfo.zeroCorrelationZoneConfig; uint8_t restricted_set = phy_vars_eNB->lte_frame_parms.prach_config_common.prach_ConfigInfo.highSpeedFlag; int16_t *prachF = phy_vars_eNB->lte_eNB_prach_vars.prachF; int16_t **rxsigF = phy_vars_eNB->lte_eNB_prach_vars.rxsigF; int16_t **prach_ifft = phy_vars_eNB->lte_eNB_prach_vars.prach_ifft; int16_t *prach[4]; int16_t *prach2; uint8_t n_ra_prb; uint8_t preamble_index; uint16_t NCS,NCS2; uint16_t preamble_offset=0,preamble_offset_old; int16_t preamble_shift=0; uint32_t preamble_shift2; uint16_t preamble_index0=0,n_shift_ra=0,n_shift_ra_bar; uint16_t d_start=0; uint16_t numshift=0; uint16_t *prach_root_sequence_map; uint8_t prach_fmt = get_prach_fmt(prach_ConfigIndex,frame_type); uint16_t N_ZC = (prach_fmt <4)?839:139; uint8_t not_found; int k; uint16_t u; int16_t *Xu; uint16_t offset; int16_t Ncp; uint16_t first_nonzero_root_idx=0; uint8_t new_dft=0; uint8_t aa; int32_t lev; int16_t levdB; int fft_size,log2_ifft_size; uint8_t nb_ant_rx = 1; //phy_vars_eNB->lte_frame_parms.nb_antennas_rx; for (aa=0; aa<nb_ant_rx; aa++) { prach[aa] = (int16_t*)&phy_vars_eNB->lte_eNB_common_vars.rxdata[0][aa][subframe*phy_vars_eNB->lte_frame_parms.samples_per_tti-phy_vars_eNB->N_TA_offset]; } // First compute physical root sequence if (restricted_set == 0) { if (Ncs_config>15) { LOG_E(PHY,"FATAL, Illegal Ncs_config for unrestricted format %d\n",Ncs_config); mac_xface->macphy_exit("PRACH Illegal Ncs_config for unrestricted format"); return; // not reached } NCS = NCS_unrestricted[Ncs_config]; } else { if (Ncs_config>14) { LOG_E(PHY,"FATAL, Illegal Ncs_config for restricted format %d\n",Ncs_config); mac_xface->macphy_exit("PRACH Illegal Ncs_config for restricted format"); return; // not reached } NCS = NCS_restricted[Ncs_config]; } start_meas(&phy_vars_eNB->rx_prach); n_ra_prb = get_prach_prb_offset(&(phy_vars_eNB->lte_frame_parms),tdd_mapindex,Nf); prach_root_sequence_map = (prach_fmt < 4) ? prach_root_sequence_map0_3 : prach_root_sequence_map4; // PDP is oversampled, e.g. 1024 sample instead of 839 // Adapt the NCS (zero-correlation zones) with oversampling factor e.g. 1024/839 NCS2 = (N_ZC==839) ? ((NCS<<10)/839) : ((NCS<<8)/139); if (NCS2==0) NCS2 = N_ZC; switch (prach_fmt) { case 0: Ncp = 3168; break; case 1: case 3: Ncp = 21024; break; case 2: Ncp = 6240; break; case 4: Ncp = 448; break; default: Ncp = 3168; break; } switch (phy_vars_eNB->lte_frame_parms.N_RB_UL) { case 6: Ncp>>=4; break; case 15: Ncp>>=3; break; case 25: Ncp>>=2; break; case 50: Ncp>>=1; break; case 75: Ncp=(Ncp*3)>>2; break; } preamble_offset_old = 99; for (preamble_index=0 ; preamble_index<64 ; preamble_index++) { if (restricted_set == 0) { // This is the relative offset in the root sequence table (5.7.2-4 from 36.211) for the given preamble index preamble_offset = ((NCS==0)? preamble_index : (preamble_index/(N_ZC/NCS))); if (preamble_offset != preamble_offset_old) { preamble_offset_old = preamble_offset; new_dft = 1; // This is the \nu corresponding to the preamble index preamble_shift = 0; } else { preamble_shift -= NCS; if (preamble_shift < 0) preamble_shift+=N_ZC; } } else { // This is the high-speed case new_dft = 0; // set preamble_offset to initial rootSequenceIndex and look if we need more root sequences for this // preamble index and find the corresponding cyclic shift // Check if all shifts for that root have been processed if (preamble_index0 == numshift) { not_found = 1; new_dft = 1; preamble_index0 -= numshift; (preamble_offset==0 && numshift==0) ? (preamble_offset) : (preamble_offset++); while (not_found == 1) { // current root depending on rootSequenceIndex int index = (rootSequenceIndex + preamble_offset) % N_ZC; if (prach_fmt<4) { // prach_root_sequence_map points to prach_root_sequence_map0_3 DevAssert( index < sizeof(prach_root_sequence_map0_3) / sizeof(prach_root_sequence_map0_3[0]) ); } else { // prach_root_sequence_map points to prach_root_sequence_map4 DevAssert( index < sizeof(prach_root_sequence_map4) / sizeof(prach_root_sequence_map4[0]) ); } u = prach_root_sequence_map[index]; uint16_t n_group_ra = 0; if ( (du[u]<(N_ZC/3)) && (du[u]>=NCS) ) { n_shift_ra = du[u]/NCS; d_start = (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = N_ZC/d_start; n_shift_ra_bar = max(0,(N_ZC-(du[u]<<1)-(n_group_ra*d_start))/N_ZC); } else if ( (du[u]>=(N_ZC/3)) && (du[u]<=((N_ZC - NCS)>>1)) ) { n_shift_ra = (N_ZC - (du[u]<<1))/NCS; d_start = N_ZC - (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = du[u]/d_start; n_shift_ra_bar = min(n_shift_ra,max(0,(du[u]- (n_group_ra*d_start))/NCS)); } else { n_shift_ra = 0; n_shift_ra_bar = 0; } // This is the number of cyclic shifts for the current root u numshift = (n_shift_ra*n_group_ra) + n_shift_ra_bar; // skip to next root and recompute parameters if numshift==0 (numshift>0) ? (not_found = 0) : (preamble_offset++); } } if (n_shift_ra>0) preamble_shift = -((d_start * (preamble_index0/n_shift_ra)) + ((preamble_index0%n_shift_ra)*NCS)); // minus because the channel is h(t -\tau + Cv) else preamble_shift = 0; if (preamble_shift < 0) preamble_shift+=N_ZC; preamble_index0++; if (preamble_index == 0) first_nonzero_root_idx = preamble_offset; } // Compute DFT of RX signal (conjugate input, results in conjugate output) for each new rootSequenceIndex #ifdef PRACH_DEBUG LOG_I(PHY,"preamble index %d: offset %d, preamble shift %d\n",preamble_index,preamble_offset,preamble_shift); #endif log2_ifft_size = 10; fft_size = 6144; if (new_dft == 1) { new_dft = 0; Xu=(int16_t*)phy_vars_eNB->X_u[preamble_offset-first_nonzero_root_idx]; for (aa=0; aa<nb_ant_rx; aa++) { prach2 = prach[aa] + (Ncp<<1); k = (12*n_ra_prb) - 6*phy_vars_eNB->lte_frame_parms.N_RB_UL; if (k<0) k+=(phy_vars_eNB->lte_frame_parms.ofdm_symbol_size); k*=12; k+=13; // phi + K/2 // k+=(12*phy_vars_eNB->lte_frame_parms.first_carrier_offset); // if (k>(12*phy_vars_eNB->lte_frame_parms.ofdm_symbol_size)) // k-=(12*phy_vars_eNB->lte_frame_parms.ofdm_symbol_size); // printf("First prach carrier : k %d\n",k); k*=2; // do DFT switch (phy_vars_eNB->lte_frame_parms.N_RB_UL) { case 6: if (prach_fmt == 4) { dft256(prach2,rxsigF[aa],1); } else { dft1536(prach2,rxsigF[aa],1); if (prach_fmt>1) dft1536(prach2+3072,rxsigF[aa]+3072,1); } break; case 15: if (prach_fmt == 4) { dft256(prach2,rxsigF[aa],1); } else { dft3072(prach2,rxsigF[aa]); if (prach_fmt>1) dft3072(prach2+6144,rxsigF[aa]+6144); } break; case 25: default: if (prach_fmt == 4) { dft1024(prach2,rxsigF[aa],1); fft_size = 1024; } else { dft6144(prach2,rxsigF[aa]); if (prach_fmt>1) dft6144(prach2+12288,rxsigF[aa]+12288); fft_size = 6144; } break; case 50: if (prach_fmt == 4) { dft2048(prach2,rxsigF[aa],1); } else { dft12288(prach2,rxsigF[aa]); if (prach_fmt>1) dft12288(prach2+24576,rxsigF[aa]+24576); } break; case 75: if (prach_fmt == 4) { dft3072(prach2,rxsigF[aa]); } else { dft18432(prach2,rxsigF[aa]); if (prach_fmt>1) dft18432(prach2+36864,rxsigF[aa]+36864); } break; case 100: if (prach_fmt == 4) { dft4096(prach2,rxsigF[aa],1); } else { dft24576(prach2,rxsigF[aa]); if (prach_fmt>1) dft24576(prach2+49152,rxsigF[aa]+49152); } break; } memset( prachF, 0, sizeof(int16_t)*2*1024 ); #ifdef PRACH_DEBUG write_output("prach_rx0.m","prach_rx0",prach[0],6144+792,1,1); #endif // write_output("prach_rx1.m","prach_rx1",prach[1],6144+792,1,1); // write_output("prach_rxF0.m","prach_rxF0",rxsigF[0],24576,1,1); // write_output("prach_rxF1.m","prach_rxF1",rxsigF[1],6144,1,1); // Do componentwise product with Xu* for (offset=0; offset<(N_ZC<<1); offset+=2) { prachF[offset] = (int16_t)(((int32_t)Xu[offset]*rxsigF[aa][k] + (int32_t)Xu[offset+1]*rxsigF[aa][k+1])>>15); prachF[offset+1] = (int16_t)(((int32_t)Xu[offset]*rxsigF[aa][k+1] - (int32_t)Xu[offset+1]*rxsigF[aa][k])>>15); /* if (offset<16) printf("Xu[%d] %d %d, rxsigF[%d][%d] %d %d\n",offset,Xu[offset],Xu[offset+1],aa,k,rxsigF[aa][k],rxsigF[aa][k+1]); */ /* mmtmpX0 = _mm_madd_epi16(*(__m128i*)&Xu[offset],*(__m128i*)&rxsigF[aa][k<<1]); mmtmpX1 = _mm_shufflelo_epi16(*(__m128i*)&Xu[offset],_MM_SHUFFLE(2,3,0,1)); mmtmpX1 = _mm_shufflehi_epi16(mmtmpX1,_MM_SHUFFLE(2,3,0,1)); mmtmpX1 = _mm_sign_epi16(mmtmpX1,*(__m128i*)&conjugate[0]); mmtmpX1 = _mm_madd_epi16(mmtmpX1,*(__m128i*)&rxsigF[aa][k<<1]); mmtmpX0 = _mm_srai_epi32(mmtmpX0,15); mmtmpX1 = _mm_srai_epi32(mmtmpX1,15); mmtmpX2 = _mm_unpacklo_epi32(mmtmpX0,mmtmpX1); mmtmpX3 = _mm_unpackhi_epi32(mmtmpX0,mmtmpX1); *(__m128i*)&prachF[offset] = _mm_packs_epi32(mmtmpX2,mmtmpX3); */ k+=2; if (k==(12*2*phy_vars_eNB->lte_frame_parms.ofdm_symbol_size)) k=0; } // Now do IFFT of size 1024 (N_ZC=839) or 256 (N_ZC=139) if (N_ZC == 839) { log2_ifft_size = 10; idft1024(prachF,prach_ifft[aa],1); } else { idft256(prachF,prach_ifft[aa],1); log2_ifft_size = 8; } #ifdef PRACH_DEBUG write_output("prach_rxF_comp0.m","prach_rxF_comp0",prachF,1024,1,1); #endif // write_output("prach_rxF_comp1.m","prach_rxF_comp1",prachF,1024,1,1); }// antennas_rx #ifdef PRACH_DEBUG write_output("prach_ifft0.m","prach_t0",prach_ifft[0],2048,1,1); #endif // write_output("prach_ifft1.m","prach_t1",prach_ifft[1],2048,1,1); } // new dft // check energy in nth time shift preamble_shift2 = ((preamble_shift==0) ? 0 : ((preamble_shift<<log2_ifft_size)/N_ZC)); preamble_energy_list[preamble_index] = 0; for (i=0; i<NCS2; i++) { lev = 0; for (aa=0; aa<nb_ant_rx; aa++) { lev += (int32_t)prach_ifft[aa][(preamble_shift2+i)<<1]*prach_ifft[aa][(preamble_shift2+i)<<1] + (int32_t)prach_ifft[aa][1+((preamble_shift2+i)<<1)]*prach_ifft[aa][1+((preamble_shift2+i)<<1)]; } levdB = dB_fixed_times10(lev); if (levdB>preamble_energy_list[preamble_index] ) { preamble_energy_list[preamble_index] = levdB; preamble_delay_list[preamble_index] = (i*fft_size)>>log2_ifft_size; } } #ifdef PRACH_DEBUG LOG_D(PHY,"[RAPROC] Preamble %d => %d dB, %d (shift %d (%d), NCS2 %d(%d), Ncp %d)\n",preamble_index,preamble_energy_list[preamble_index],preamble_delay_list[preamble_index],preamble_shift2, preamble_shift, NCS2,NCS,Ncp); #endif // exit(-1); }// preamble_index stop_meas(&phy_vars_eNB->rx_prach); } void init_prach_tables(int N_ZC) { int i,m; // Compute the modular multiplicative inverse 'iu' of u s.t. iu*u = 1 mod N_ZC ZC_inv[0] = 0; ZC_inv[1] = 1; for (i=2; i<N_ZC; i++) { for (m=2; m<N_ZC; m++) if (((i*m)%N_ZC) == 1) { ZC_inv[i] = m; break; } #ifdef PRACH_DEBUG if (i<16) printf("i %d : inv %d\n",i,ZC_inv[i]); #endif } // Compute quantized roots of unity for (i=0; i<N_ZC; i++) { ru[i<<1] = (int16_t)(floor(32767.0*cos(2*M_PI*(double)i/N_ZC))); ru[1+(i<<1)] = (int16_t)(floor(32767.0*sin(2*M_PI*(double)i/N_ZC))); #ifdef PRACH_DEBUG if (i<16) printf("i %d : runity %d,%d\n",i,ru[i<<1],ru[1+(i<<1)]); #endif } } void compute_prach_seq(PRACH_CONFIG_COMMON *prach_config_common, lte_frame_type_t frame_type, uint32_t X_u[64][839]) { // Compute DFT of x_u => X_u[k] = x_u(inv(u)*k)^* X_u[k] = exp(j\pi u*inv(u)*k*(inv(u)*k+1)/N_ZC) unsigned int k,inv_u,i,NCS=0,num_preambles; int N_ZC; uint8_t prach_fmt = get_prach_fmt(prach_config_common->prach_ConfigInfo.prach_ConfigIndex,frame_type); uint16_t *prach_root_sequence_map; uint16_t u, preamble_offset; uint16_t n_shift_ra,n_shift_ra_bar, d_start,numshift; uint8_t not_found; VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_UE_COMPUTE_PRACH, VCD_FUNCTION_IN); #ifdef PRACH_DEBUG LOG_I(PHY,"compute_prach_seq: NCS_config %d, prach_fmt %d\n",prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig, prach_fmt); #endif if (prach_fmt>=4) { LOG_E( PHY, "PRACH sequence is only precomputed for prach_fmt<4 (have %"PRIu8")\n", prach_fmt ); mac_xface->macphy_exit("PRACH sequence is only precomputed for prach_fmt<4"); return; // not reached } N_ZC = (prach_fmt < 4) ? 839 : 139; //init_prach_tables(N_ZC); //moved to phy_init_lte_ue/eNB, since it takes to long in real-time if (prach_fmt < 4) { prach_root_sequence_map = prach_root_sequence_map0_3; } else { // FIXME cannot be reached prach_root_sequence_map = prach_root_sequence_map4; } #ifdef PRACH_DEBUG LOG_I( PHY, "compute_prach_seq: done init prach_tables\n" ); #endif if (prach_config_common->prach_ConfigInfo.highSpeedFlag== 0) { #ifdef PRACH_DEBUG LOG_I(PHY,"Low speed prach : NCS_config %d\n",prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig); #endif if (prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig>15) { LOG_E( PHY, "FATAL, Illegal Ncs_config for unrestricted format %"PRIu8"\n", prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig ); mac_xface->macphy_exit("PRACH Illegal Ncs_config for unrestricted format"); return; // not reached } else { NCS = NCS_unrestricted[prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig]; } num_preambles = (NCS==0) ? 64 : ((64*NCS)/N_ZC); if (NCS>0) num_preambles++; preamble_offset = 0; } else { #ifdef PRACH_DEBUG LOG_I( PHY, "high speed prach : NCS_config %"PRIu8"\n", prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig ); #endif if (prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig>14) { LOG_E( PHY, "FATAL, Illegal Ncs_config for restricted format %"PRIu8"\n", prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig ); mac_xface->macphy_exit("PRACH Illegal Ncs_config for restricted format"); return; // not reached } else { NCS = NCS_restricted[prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig]; fill_du(prach_fmt); } num_preambles = 64; // compute ZC sequence for 64 possible roots // find first non-zero shift root (stored in preamble_offset) not_found = 1; preamble_offset = 0; while (not_found == 1) { // current root depending on rootSequenceIndex int index = (prach_config_common->rootSequenceIndex + preamble_offset) % N_ZC; if (prach_fmt<4) { // prach_root_sequence_map points to prach_root_sequence_map0_3 DevAssert( index < sizeof(prach_root_sequence_map0_3) / sizeof(prach_root_sequence_map0_3[0]) ); } else { // prach_root_sequence_map points to prach_root_sequence_map4 DevAssert( index < sizeof(prach_root_sequence_map4) / sizeof(prach_root_sequence_map4[0]) ); } u = prach_root_sequence_map[index]; uint16_t n_group_ra = 0; if ( (du[u]<(N_ZC/3)) && (du[u]>=NCS) ) { n_shift_ra = du[u]/NCS; d_start = (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = N_ZC/d_start; n_shift_ra_bar = max(0,(N_ZC-(du[u]<<1)-(n_group_ra*d_start))/N_ZC); } else if ( (du[u]>=(N_ZC/3)) && (du[u]<=((N_ZC - NCS)>>1)) ) { n_shift_ra = (N_ZC - (du[u]<<1))/NCS; d_start = N_ZC - (du[u]<<1) + (n_shift_ra * NCS); n_group_ra = du[u]/d_start; n_shift_ra_bar = min(n_shift_ra,max(0,(du[u]- (n_group_ra*d_start))/NCS)); } else { n_shift_ra = 0; n_shift_ra_bar = 0; } // This is the number of cyclic shifts for the current root u numshift = (n_shift_ra*n_group_ra) + n_shift_ra_bar; // skip to next root and recompute parameters if numshift==0 if (numshift>0) not_found = 0; else preamble_offset++; } } #ifdef PRACH_DEBUG if (NCS>0) LOG_I( PHY, "Initializing %u preambles for PRACH (NCS_config %"PRIu8", NCS %u, N_ZC/NCS %u)\n", num_preambles, prach_config_common->prach_ConfigInfo.zeroCorrelationZoneConfig, NCS, N_ZC/NCS ); #endif for (i=0; i<num_preambles; i++) { int index = (prach_config_common->rootSequenceIndex+i+preamble_offset) % N_ZC; if (prach_fmt<4) { // prach_root_sequence_map points to prach_root_sequence_map0_3 DevAssert( index < sizeof(prach_root_sequence_map0_3) / sizeof(prach_root_sequence_map0_3[0]) ); } else { // prach_root_sequence_map points to prach_root_sequence_map4 DevAssert( index < sizeof(prach_root_sequence_map4) / sizeof(prach_root_sequence_map4[0]) ); } u = prach_root_sequence_map[index]; inv_u = ZC_inv[u]; // multiplicative inverse of u // X_u[0] stores the first ZC sequence where the root u has a non-zero number of shifts // for the unrestricted case X_u[0] is the first root indicated by the rootSequenceIndex for (k=0; k<N_ZC; k++) { // 420 is the multiplicative inverse of 2 (required since ru is exp[j 2\pi n]) X_u[i][k] = ((uint32_t*)ru)[(((k*(1+(inv_u*k)))%N_ZC)*420)%N_ZC]; // printf("X_u[%d][%d] (%d)(%d)(%d) : %d,%d\n",i,k,u*inv_u*k*(1+(inv_u*k)),u*inv_u*k*(1+(inv_u*k))/2,(u*inv_u*k*(1+(inv_u*k))/2)%N_ZC,((int16_t*)&X_u[i][k])[0],((int16_t*)&X_u[i][k])[1]); } } VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_UE_COMPUTE_PRACH, VCD_FUNCTION_OUT); }