259 lines
7.9 KiB
C
259 lines
7.9 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface 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, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface 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 for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
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Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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*******************************************************************************/
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/*! \file PHY/LTE_TRANSPORT/pilots.c
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* \brief Top-level routines for generating DL cell-specific reference signals V8.6 2009-03
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* \author R. Knopp, F. Kaltenberger
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* \date 2011
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* \version 0.1
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* \company Eurecom
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* \email: knopp@eurecom.fr,florian.kaltenberger.fr
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* \note
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* \warning
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*/
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//#include "defs.h"
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#include "PHY/defs.h"
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void generate_pilots(PHY_VARS_eNB *eNB,
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int32_t **txdataF,
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int16_t amp,
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uint16_t Ntti)
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{
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LTE_DL_FRAME_PARMS *frame_parms = &eNB->frame_parms;
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uint32_t tti,tti_offset,slot_offset,Nsymb,samples_per_symbol;
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uint8_t second_pilot;
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Nsymb = (frame_parms->Ncp==0)?14:12;
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second_pilot = (frame_parms->Ncp==0)?4:3;
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// printf("Doing TX pilots Nsymb %d, second_pilot %d\n",Nsymb,second_pilot);
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for (tti=0; tti<Ntti; tti++) {
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tti_offset = tti*frame_parms->ofdm_symbol_size*Nsymb;
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samples_per_symbol = frame_parms->ofdm_symbol_size;
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slot_offset = (tti*2)%20;
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// printf("tti %d : offset %d (slot %d)\n",tti,tti_offset,slot_offset);
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//Generate Pilots
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//antenna 0 symbol 0 slot 0
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lte_dl_cell_spec(eNB,&txdataF[0][tti_offset],
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amp,
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slot_offset,
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0,
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0);
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// printf("tti %d : second_pilot offset %d \n",tti,tti_offset+(second_pilot*samples_per_symbol));
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//antenna 0 symbol 3/4 slot 0
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lte_dl_cell_spec(eNB,&txdataF[0][tti_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot_offset,
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1,
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0);
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// printf("tti %d : third_pilot offset %d \n",tti,tti_offset+((Nsymb>>1)*samples_per_symbol));
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//antenna 0 symbol 0 slot 1
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lte_dl_cell_spec(eNB,&txdataF[0][tti_offset+((Nsymb>>1)*samples_per_symbol)],
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amp,
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1+slot_offset,
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0,
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0);
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// printf("tti %d : third_pilot offset %d \n",tti,tti_offset+(((Nsymb>>1)+second_pilot)*samples_per_symbol));
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//antenna 0 symbol 3/4 slot 1
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lte_dl_cell_spec(eNB,&txdataF[0][tti_offset+(((Nsymb>>1)+second_pilot)*samples_per_symbol)],
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amp,
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1+slot_offset,
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1,
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0);
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if (frame_parms->nb_antennas_tx > 1) {
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if (frame_parms->mode1_flag) {
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// antenna 1 symbol 0 slot 0
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset],
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amp,
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slot_offset,
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0,
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0);
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// antenna 1 symbol 3 slot 0
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot_offset,
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1,
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0);
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//antenna 1 symbol 0 slot 1
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(Nsymb>>1)*samples_per_symbol],
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amp,
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1+slot_offset,
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0,
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0);
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// antenna 1 symbol 3 slot 1
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(((Nsymb>>1)+second_pilot)*samples_per_symbol)],
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amp,
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1+slot_offset,
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1,
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0);
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} else {
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// antenna 1 symbol 0 slot 0
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset],
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amp,
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slot_offset,
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0,
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1);
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// antenna 1 symbol 3 slot 0
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot_offset,
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1,
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1);
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//antenna 1 symbol 0 slot 1
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(Nsymb>>1)*samples_per_symbol],
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amp,
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1+slot_offset,
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0,
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1);
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// antenna 1 symbol 3 slot 1
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lte_dl_cell_spec(eNB,&txdataF[1][tti_offset+(((Nsymb>>1)+second_pilot)*samples_per_symbol)],
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amp,
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1+slot_offset,
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1,
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1);
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}
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}
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}
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}
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int generate_pilots_slot(PHY_VARS_eNB *eNB,
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int32_t **txdataF,
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int16_t amp,
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uint16_t slot,
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int first_pilot_only)
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{
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LTE_DL_FRAME_PARMS *frame_parms = &eNB->frame_parms;
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uint32_t slot_offset,Nsymb,samples_per_symbol;
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uint8_t second_pilot;
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if (slot<0 || slot>= 20) {
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msg("generate_pilots_slot: slot not in range (%d)\n",slot);
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return(-1);
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}
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Nsymb = (frame_parms->Ncp==0)?7:6;
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second_pilot = (frame_parms->Ncp==0)?4:3;
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slot_offset = slot*frame_parms->ofdm_symbol_size*Nsymb;
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samples_per_symbol = frame_parms->ofdm_symbol_size;
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// printf("tti %d : offset %d (slot %d)\n",tti,tti_offset,slot_offset);
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//Generate Pilots
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//antenna 0 symbol 0 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[0][slot_offset],
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amp,
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slot,
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0,
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0);
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if (first_pilot_only==0) {
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//antenna 0 symbol 3 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[0][slot_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot,
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1,
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0);
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}
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if (frame_parms->nb_antennas_tx > 1) {
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if (frame_parms->mode1_flag) {
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// antenna 1 symbol 0 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[1][slot_offset],
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amp,
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slot,
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0,
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0);
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if (first_pilot_only==0) {
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// antenna 1 symbol 3 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[1][slot_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot,
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1,
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0);
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}
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} else {
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// antenna 1 symbol 0 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[1][slot_offset],
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amp,
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slot,
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0,
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1);
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if (first_pilot_only == 0) {
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// antenna 1 symbol 3 slot 0
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lte_dl_cell_spec(eNB,
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&txdataF[1][slot_offset+(second_pilot*samples_per_symbol)],
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amp,
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slot,
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1,
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1);
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}
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}
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}
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return(0);
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}
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