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Implemented FeMBMS Channel Estimation (1.25 KHz @ 25 RB)

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This commit is contained in:
Javier Morgade
2019-04-11 21:39:33 +02:00
parent 42db242189
commit bffa7ca056
1 changed files with 184 additions and 0 deletions
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openair1/PHY/LTE_ESTIMATION/lte_dl_mbsfn_channel_estimation.c
+184
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@@ -24,6 +24,8 @@
#include "lte_estimation.h"
#include "PHY/LTE_REFSIG/lte_refsig.h"
#include "filt96_32_khz_1dot25.h"
//#define DEBUG_CH
int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *ue,
module_id_t eNB_id,
@@ -769,3 +771,185 @@ int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *ue,
return(0);
}
#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
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;
unsigned int rb;
int16_t ch[2];
short *pil,*rxF,*dl_ch,*ch0,*ch1,*ch11,*chp,*ch_prev;
int ch_offset,symbol_offset;
int pilot_cnt;
int16_t *f,*f2,*fl,*f2l2,*fr,*f2r2,*f2_dc,*f_dc;
unsigned int ofdm_symbol_size;
unsigned int m,s;
unsigned int k;
// unsigned int n;
// int i;
int **dl_ch_estimates=ue->common_vars.common_vars_rx_data_per_thread[ue->current_thread_id[subframe]].dl_ch_estimates[0];
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 %d\n",ue->frame_parms.N_RB_DL);
if( (subframe&0x1) == 0){
f=filt24_0_khz_1dot25;
f2=filt24_2_khz_1dot25;
fl=filt24_0_khz_1dot25;
f2l2=filt24_2_khz_1dot25;
fr=filt24_0r2_khz_1dot25;
f2r2=filt24_2r_khz_1dot25;
f_dc=filt24_0_dcr_khz_1dot25;
f2_dc=filt24_2_dcl_khz_1dot25;
}else{
f=filt24_0_khz_1dot25;
f2=filt24_2_khz_1dot25;
fl=filt24_0_khz_1dot25;
f2l2=filt24_2_khz_1dot25;
fr=filt24_0r2_khz_1dot25;
f2r2=filt24_2r_khz_1dot25;
f_dc=filt24_0_dcr_khz_1dot25;
f2_dc=filt24_2_dcl_khz_1dot25;
}
for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
// generate pilot
lte_dl_mbsfn_khz_1dot25_rx(ue,
&pilot_khz_1dot25[0],
subframe);
pil = (short *)&pilot_khz_1dot25[0];
rxF = (short *)&rxdataF[aarx][((ue->frame_parms.first_carrier_offset_khz_1dot25))];
dl_ch = (short *)&dl_ch_estimates[aarx][ch_offset];
memset(dl_ch,0,4*(ue->frame_parms.ofdm_symbol_size_khz_1dot25));
int shift;
if( (subframe&0x1) == 0){
rxF+=0;
shift=0;
k=0;
}else{
rxF+=6;//2*3;
k=3;
}
if(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,
ch,
dl_ch,
24);
pil+=2; // Re Im
rxF+=12;
dl_ch+=8;
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(f2l2,
ch,
dl_ch,
24);
pil+=2; // Re Im
rxF+=12;
dl_ch+=16;
for(pilot_cnt=2;pilot_cnt<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,
ch,
dl_ch,
24);
pil+=2; // Re Im
rxF+=12;
dl_ch+=8;
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(f2,
ch,
dl_ch,
24);
pil+=2;
rxF+=12;
dl_ch+=16;
}
rxF = (int16_t *)&rxdataF[aarx][((symbol_offset+1+k))]; //Skip DC offset
for(pilot_cnt=0; pilot_cnt<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,
ch,
dl_ch,
24);
pil+=2;
rxF+=12;
dl_ch+=8;
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(f2,
ch,
dl_ch,
24);
pil+=2;
rxF+=12;
dl_ch+=16;
}
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(fr,
ch,
dl_ch,
24);
pil+=2; // Re Im
rxF+=12;
dl_ch+=8;
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(f2r2,
ch,
dl_ch,
24);
}
}
return(0);
}
#endif