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/*******************************************************************************
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@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
#include "PHY/defs.h"
#include "MAC_INTERFACE/extern.h"
#include "defs.h"
//#define DEBUG_FEP
#define SOFFSET 0
int slot_fep_mbsfn(PHY_VARS_UE *phy_vars_ue,
unsigned char l,
int subframe,
int sample_offset,
int no_prefix)
{
LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_ue->lte_frame_parms;
LTE_UE_COMMON *ue_common_vars = &phy_vars_ue->lte_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;
void (*dft)(int16_t *,int16_t *, int);
switch (frame_parms->log2_symbol_size) {
case 7:
dft = dft128;
break;
case 8:
dft = dft256;
break;
case 9:
dft = dft512;
break;
case 10:
dft = dft1024;
break;
case 11:
dft = dft2048;
break;
default:
dft = dft512;
break;
}
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) {
msg("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
msg("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
msg("slot_fep_mbsfn: Subframe must be 3,4,7,8,9 for TDD, Got %d \n",subframe);
return(-1);
}
#ifdef DEBUG_FEP
msg("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(&ue_common_vars->rxdataF[aa][2*frame_parms->ofdm_symbol_size*l],0,2*frame_parms->ofdm_symbol_size*sizeof(int));
if (l==0) {
start_meas(&phy_vars_ue->rx_dft_stats);
dft((int16_t *)&ue_common_vars->rxdata[aa][(sample_offset +
nb_prefix_samples0 +
subframe_offset -
SOFFSET) % frame_length_samples],
(int16_t *)&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*l],1);
stop_meas(&phy_vars_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 *)&ue_common_vars->rxdata[aa][frame_length_samples],
(short *)&ue_common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
start_meas(&phy_vars_ue->rx_dft_stats);
dft((int16_t *)&ue_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 *)&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*l],1);
stop_meas(&phy_vars_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 (phy_vars_ue->perfect_ce == 0) {
#ifdef DEBUG_FEP
msg("Channel estimation eNB %d, aatx %d, subframe %d, symbol %d\n",eNB_id,aa,subframe,l);
#endif
lte_dl_mbsfn_channel_estimation(phy_vars_ue,
eNB_id,
0,
subframe,
l);
/* for (i=0;i<phy_vars_ue->PHY_measurements.n_adj_cells;i++) {
lte_dl_mbsfn_channel_estimation(phy_vars_ue,
eNB_id,
i+1,
subframe,
l);
lte_dl_channel_estimation(phy_vars_ue,eNB_id,0,
Ns,
aa,
l,
symbol);
for (i=0;i<phy_vars_ue->PHY_measurements.n_adj_cells;i++) {
lte_dl_channel_estimation(phy_vars_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
msg("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(ue_common_vars->dl_ch_estimates[0],
frame_parms,
l,
&ue_common_vars->freq_offset); */
}
}
}
#ifdef DEBUG_FEP
msg("slot_fep_mbsfn: done\n");
#endif
return(0);
}