200 lines
6.1 KiB
C
200 lines
6.1 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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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 port 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 port 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 port 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 port 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_antenna_ports_eNB > 1) {
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// antenna port 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 port 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 port 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 port 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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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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LOG_E(PHY,"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 port 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_antenna_ports_eNB > 1) {
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// antenna port 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 port 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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return(0);
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}
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