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FeMBMS 1.25KHz Carrier Spacing OFDM demodulation and Channel Estimation Procedures

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This commit is contained in:
Javier Morgade
2019-04-11 21:50:21 +02:00
parent e58b56548d
commit 0a4dd14009
1 changed files with 109 additions and 0 deletions
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openair1/PHY/MODULATION/slot_fep_mbsfn.c
+109
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@@ -204,3 +204,112 @@ int slot_fep_mbsfn(PHY_VARS_UE *ue,
#endif #endif
return(0); return(0);
} }
#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 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;
void (*dft)(int16_t *,int16_t *, int);
AssertFatal(frame_parms->frame_type == FDD, "Frame is TDD!\n");
switch (frame_parms->ofdm_symbol_size) {
case 128:
dft = dft1536;
ofdm_symbol_size=1536;
nb_prefix_samples=384;
break;
case 256:
AssertFatal(1==0,"FeMBMS dft3072 not implemented\n");
dft = dft3072;
ofdm_symbol_size=3072;
nb_prefix_samples=768;
break;
case 512:
dft = dft6144;
nb_prefix_samples=1536;
ofdm_symbol_size=6144;
break;
case 1024:
dft = dft12288;
nb_prefix_samples=3072;
ofdm_symbol_size=12288;
break;
case 1536:
dft = dft18432;
nb_prefix_samples=4608;
ofdm_symbol_size=18432;
break;
case 2048:
dft = dft24576;
nb_prefix_samples=6144;
ofdm_symbol_size=24576;
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));
#if UE_TIMING_TRACE
start_meas(&ue->rx_dft_stats);
#endif
dft((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);
#if UE_TIMING_TRACE
stop_meas(&ue->rx_dft_stats);
#endif
}
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);
}
#endif