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openairinterface5g/openair1/PHY/MODULATION/slot_fep_mbsfn.c
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include "PHY/defs_UE.h"
#include "modulation_UE.h"
#include "PHY/LTE_ESTIMATION/lte_estimation.h"
//#define DEBUG_FEP
#define SOFFSET 0
int slot_fep_mbsfn(PHY_VARS_UE *ue,
unsigned char l,
int subframe,
int sample_offset,
int no_prefix) {
LTE_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
LTE_UE_COMMON *common_vars = &ue->common_vars;
uint8_t eNB_id = 0;//ue_common_vars->eNb_id;
unsigned char aa;
unsigned char frame_type = frame_parms->frame_type; // Frame Type: 0 - FDD, 1 - TDD;
unsigned int nb_prefix_samples = frame_parms->ofdm_symbol_size>>2;//(no_prefix ? 0 : frame_parms->nb_prefix_samples);
unsigned int nb_prefix_samples0 = frame_parms->ofdm_symbol_size>>2;//(no_prefix ? 0 : frame_parms->nb_prefix_samples0);
unsigned int subframe_offset;
// int i;
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
int s = frame_parms->ofdm_symbol_size;
if (s != 128 && s != 256 && s != 512 && s != 1024 && s != 1536 && s != 2048)
s = 512;
dft_size_idx_t dftsizeidx = get_dft(s);
if (no_prefix) {
subframe_offset = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * subframe;
} else {
subframe_offset = frame_parms->samples_per_tti * subframe;
}
if (l<0 || l>=12) {
LOG_E(PHY,"slot_fep_mbsfn: l must be between 0 and 11\n");
return(-1);
}
if (((subframe == 0) || (subframe == 5) || // SFn 0,4,5,9;
(subframe == 4) || (subframe == 9))
&& (frame_type==FDD) ) { //check for valid MBSFN subframe
LOG_E(PHY,"slot_fep_mbsfn: Subframe must be 1,2,3,6,7,8 for FDD, Got %d \n",subframe);
return(-1);
} else if (((subframe == 0) || (subframe == 1) || (subframe==2) || // SFn 0,4,5,9;
(subframe == 5) || (subframe == 6))
&& (frame_type==TDD) ) { //check for valid MBSFN subframe
LOG_E(PHY,"slot_fep_mbsfn: Subframe must be 3,4,7,8,9 for TDD, Got %d \n",subframe);
return(-1);
}
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep_mbsfn: subframe %d, symbol %d, nb_prefix_samples %d, nb_prefix_samples0 %d, subframe_offset %d, sample_offset %d\n", subframe, l, nb_prefix_samples,nb_prefix_samples0,
subframe_offset,
sample_offset);
#endif
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
memset(&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF[aa][frame_parms->ofdm_symbol_size*l],0,frame_parms->ofdm_symbol_size*sizeof(int));
if (l==0) {
start_UE_TIMING(ue->rx_dft_stats);
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(sample_offset +
nb_prefix_samples0 +
subframe_offset -
SOFFSET) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF[aa][frame_parms->ofdm_symbol_size*l],1);
stop_UE_TIMING(ue->rx_dft_stats);
} else {
if ((sample_offset +
(frame_parms->ofdm_symbol_size+nb_prefix_samples0+nb_prefix_samples) +
(frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1) +
subframe_offset-
SOFFSET) > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((short *)&common_vars->rxdata[aa][frame_length_samples],
(short *)&common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
start_UE_TIMING(ue->rx_dft_stats);
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(sample_offset +
(frame_parms->ofdm_symbol_size+nb_prefix_samples0+nb_prefix_samples) +
(frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1) +
subframe_offset-
SOFFSET) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF[aa][frame_parms->ofdm_symbol_size*l],1);
stop_UE_TIMING(ue->rx_dft_stats);
}
}
//if ((l==0) || (l==(4-frame_parms->Ncp))) {
// changed to invoke MBSFN channel estimation in symbols 2,6,10
if ((l==2)||(l==6)||(l==10)) {
for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
if (ue->perfect_ce == 0) {
#ifdef DEBUG_FEP
LOG_D(PHY,"Channel estimation eNB %d, aatx %d, subframe %d, symbol %d\n",eNB_id,aa,subframe,l);
#endif
lte_dl_mbsfn_channel_estimation(ue,
eNB_id,
0,
subframe,
l);
/* for (i=0;i<ue->PHY_measurements.n_adj_cells;i++) {
lte_dl_mbsfn_channel_estimation(ue,
eNB_id,
i+1,
subframe,
l);
lte_dl_channel_estimation(ue,eNB_id,0,
Ns,
aa,
l,
symbol);
for (i=0;i<ue->PHY_measurements.n_adj_cells;i++) {
lte_dl_channel_estimation(ue,eNB_id,i+1,
Ns,
aa,
l,
symbol); */
// }
// do frequency offset estimation here!
// use channel estimates from current symbol (=ch_t) and last symbol (ch_{t-1})
#ifdef DEBUG_FEP
LOG_D(PHY,"Frequency offset estimation\n");
#endif
// if ((l == 0) || (l==(4-frame_parms->Ncp)))
/* if ((l==2)||(l==6)||(l==10))
lte_mbsfn_est_freq_offset(common_vars->dl_ch_estimates[0],
frame_parms,
l,
&common_vars->freq_offset); */
}
}
}
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep_mbsfn: done\n");
#endif
return(0);
}
int slot_fep_mbsfn_khz_1dot25(PHY_VARS_UE *ue,
int subframe,
int sample_offset) {
LTE_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
LTE_UE_COMMON *common_vars = &ue->common_vars;
uint8_t eNB_id = 0;//ue_common_vars->eNb_id;
unsigned char aa;
//unsigned char frame_type = frame_parms->frame_type; // Frame Type: 0 - FDD, 1 - TDD;
unsigned int nb_prefix_samples;
int ofdm_symbol_size;
unsigned int subframe_offset;
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
AssertFatal(frame_parms->frame_type == FDD, "Frame is TDD!\n");
switch (frame_parms->ofdm_symbol_size) {
case 128:
ofdm_symbol_size=1536;
nb_prefix_samples=384;
break;
case 256:
AssertFatal(1 == 0, "FeMBMS dft3072 not implemented\n");
ofdm_symbol_size=3072;
nb_prefix_samples=768;
break;
case 512:
ofdm_symbol_size=6144;
nb_prefix_samples = 1536;
break;
case 1024:
ofdm_symbol_size=12288;
nb_prefix_samples = 3072;
break;
case 1536:
ofdm_symbol_size=18432;
nb_prefix_samples = 4608;
break;
case 2048:
ofdm_symbol_size=24576;
nb_prefix_samples = 6144;
break;
default:
AssertFatal(1==0,"Illegal ofdm symbol size %d\n",frame_parms->ofdm_symbol_size);
break;
}
subframe_offset = frame_parms->samples_per_tti * subframe;
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep_mbsfn125: subframe %d, nb_prefix_samples %d, subframe_offset %d, sample_offset %d\n", subframe, nb_prefix_samples,subframe_offset,
sample_offset);
#endif
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
memset(&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF[aa][0],0,ofdm_symbol_size*sizeof(int));
start_UE_TIMING(ue->rx_dft_stats);
dft(get_dft(ofdm_symbol_size),(int16_t *)&common_vars->rxdata[aa][(sample_offset +
nb_prefix_samples +
subframe_offset -
SOFFSET) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF[aa][0],1);
stop_UE_TIMING(ue->rx_dft_stats);
}
for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
if (ue->perfect_ce == 0) {
#ifdef DEBUG_FEP
LOG_D(PHY,"Channel estimation eNB %d, aatx %d, subframe %d\n",eNB_id,aa,subframe);
#endif
lte_dl_mbsfn_khz_1dot25_channel_estimation(ue,
eNB_id,
0,
subframe);
}
}
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep_mbsfn: done\n");
#endif
return(0);
}
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