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fembms: Added support for FeMBMS UE Channel Estimation Procedures for 10 and 20 MHz BWs @ FeMBMS 1.25KHz Carrier Spacing

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Signed-off-by: Javier Morgade <javier.morgade@ieee.org>
This commit is contained in:
Javier Morgade
2020-07-21 15:07:05 +02:00
parent 58bd55b9b3
commit 8eac27b83b
1 changed files with 33 additions and 7 deletions
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openair1/PHY/LTE_ESTIMATION/lte_dl_mbsfn_channel_estimation.c
+33 -7
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@@ -22,7 +22,7 @@
/*! \file config_ue.c
* \brief This includes FeMBMS UE Channel Estimation Procedures for FeMBMS 1.25KHz Carrier Spacing
* \author Javier Morgade
* \date 2019
* \date 2020
* \version 0.1
* \email: javier.morgade@ieee.org
* @ingroup _phy
@@ -768,8 +768,8 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
module_id_t eNB_id,
uint8_t eNB_offset,
int subframe) {
int pilot_khz_1dot25[600] __attribute__((aligned(16)));
unsigned char aarx/*,aa*/;
int pilot_khz_1dot25[2*2*600] __attribute__((aligned(16)));
unsigned char aarx,aa;
//unsigned int rb;
int16_t ch[2];
short *pil,*rxF,*dl_ch/*,*ch0,*ch1,*ch11,*chp,*ch_prev*/;
@@ -783,7 +783,7 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].rxdataF;
ch_offset = 0;//(l*(ue->frame_parms.ofdm_symbol_size));
symbol_offset = 0;//ch_offset;//phy_vars_ue->lte_frame_parms.ofdm_symbol_size*l;
AssertFatal( ue->frame_parms.N_RB_DL==25,"OFDM symbol size %d not yet supported for FeMBMS\n",ue->frame_parms.N_RB_DL);
//AssertFatal( ue->frame_parms.N_RB_DL==25,"OFDM symbol size %d not yet supported for FeMBMS\n",ue->frame_parms.N_RB_DL);
if( (subframe&0x1) == 0) {
f=filt24_0_khz_1dot25;
@@ -823,7 +823,7 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
k=3;
}
if(ue->frame_parms.N_RB_DL==25) {
if(1/*ue->frame_parms.N_RB_DL==25*/) {
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
multadd_real_vector_complex_scalar(fl,
@@ -843,7 +843,7 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
rxF+=12;
dl_ch+=16;
for(pilot_cnt=2; pilot_cnt<299; pilot_cnt+=2) {
for(pilot_cnt=2; pilot_cnt<ue->frame_parms.N_RB_DL*12-1/*299*/; pilot_cnt+=2) {
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
multadd_real_vector_complex_scalar(f,
@@ -866,7 +866,7 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
rxF = (int16_t *)&rxdataF[aarx][((symbol_offset+1+k))]; //Skip DC offset
for(pilot_cnt=0; pilot_cnt<297; pilot_cnt+=2) {
for(pilot_cnt=0; pilot_cnt<ue->frame_parms.N_RB_DL*12-3/*297*/; pilot_cnt+=2) {
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
multadd_real_vector_complex_scalar(f,
@@ -905,6 +905,32 @@ int lte_dl_mbsfn_khz_1dot25_channel_estimation(PHY_VARS_UE *ue,
}
}
// do ifft of channel estimate
for (aa=0; aa<ue->frame_parms.nb_antennas_rx*ue->frame_parms.nb_antennas_tx; aa++) {
if (ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates[0][aa]) {
switch (ue->frame_parms.N_RB_DL) {
case 25:
idft(IDFT_6144,(int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates[0][aa][8],
(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates_time[0][aa],
1);
break;
case 50:
idft(IDFT_12288,(int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates[0][aa][8],
(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates_time[0][aa],
1);
break;
case 100:
idft(IDFT_24576,(int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates[0][aa][8],
(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates_time[0][aa],
1);
break;
default:
break;
}
}
}
return(0);
}