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modifications to eMBMS-related L1 processing. mbmssim now works again (performance to be checked for 10/20 MHz), but error rates decay as they should with SNR.

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This commit is contained in:
Raymond Knopp
2016-04-04 16:29:06 -07:00
parent 4ff17e2b03
commit 68fb9ef07f
3 changed files with 29 additions and 12 deletions
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openair1/PHY/LTE_ESTIMATION/lte_dl_mbsfn_channel_estimation.c
+7 -6
View File
@@ -711,7 +711,7 @@ int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *phy_vars_ue,
//------------------------Temporal Interpolation ------------------------------
if (l==6) {
ch = (short *)&dl_ch_estimates[aarx][ch_offset];
// printf("Interpolating ch 2,6 => %d\n",ch_offset);
// printf("Interpolating ch 2,6 => %d\n",ch_offset);
ch_prev = (short *)&dl_ch_estimates[aarx][2*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)];
ch0 = (short *)&dl_ch_estimates[aarx][0*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)];
memcpy(ch0,ch_prev,4*phy_vars_ue->lte_frame_parms.ofdm_symbol_size);
@@ -722,6 +722,7 @@ int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *phy_vars_ue,
// 3/4 ch2 + 1/4 ch6 => ch3
multadd_complex_vector_real_scalar(ch_prev,24576,ch_prev+(2*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)),1,phy_vars_ue->lte_frame_parms.ofdm_symbol_size);
multadd_complex_vector_real_scalar(ch,8192,ch_prev+(2*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)),0,phy_vars_ue->lte_frame_parms.ofdm_symbol_size);
// 1/2 ch2 + 1/2 ch6 => ch4
multadd_complex_vector_real_scalar(ch_prev,16384,ch_prev+(4*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)),1,phy_vars_ue->lte_frame_parms.ofdm_symbol_size);
multadd_complex_vector_real_scalar(ch,16384,ch_prev+(4*(phy_vars_ue->lte_frame_parms.ofdm_symbol_size)),0,phy_vars_ue->lte_frame_parms.ofdm_symbol_size);
@@ -755,26 +756,26 @@ int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *phy_vars_ue,
if (phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa]) {
switch (phy_vars_ue->lte_frame_parms.N_RB_DL) {
case 6:
idft128((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][LTE_CE_OFFSET],
idft128((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][8],
(int16_t*) phy_vars_ue->lte_ue_common_vars.dl_ch_estimates_time[eNB_offset][aa],
1);
break;
case 25:
idft512((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][LTE_CE_OFFSET],
idft512((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][8],
(int16_t*) phy_vars_ue->lte_ue_common_vars.dl_ch_estimates_time[eNB_offset][aa],
1);
break;
case 50:
idft1024((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][LTE_CE_OFFSET],
idft1024((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][8],
(int16_t*) phy_vars_ue->lte_ue_common_vars.dl_ch_estimates_time[eNB_offset][aa],
1);
break;
case 75:
idft1536((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][LTE_CE_OFFSET],
idft1536((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][8],
(int16_t*) phy_vars_ue->lte_ue_common_vars.dl_ch_estimates_time[eNB_offset][aa]);
break;
case 100:
idft2048((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][LTE_CE_OFFSET],
idft2048((int16_t*) &phy_vars_ue->lte_ue_common_vars.dl_ch_estimates[eNB_offset][aa][8],
(int16_t*) phy_vars_ue->lte_ue_common_vars.dl_ch_estimates_time[eNB_offset][aa],
1);
break;
openair1/PHY/LTE_TRANSPORT/pmch.c
+2
View File
@@ -379,6 +379,7 @@ void mch_extract_rbs(int **rxdataF,
dl_ch_estimates_ext[aarx][(frame_parms->N_RB_DL*3)+j+symbol*(frame_parms->N_RB_DL*12)] = dl_ch_estimates[aarx][i+(frame_parms->N_RB_DL*6)+(symbol*frame_parms->ofdm_symbol_size)];
}
} else {
memcpy((void*)&rxdataF_ext[aarx][symbol*(frame_parms->N_RB_DL*12)],
(void*)&rxdataF[aarx][frame_parms->first_carrier_offset + (symbol*frame_parms->ofdm_symbol_size)],
frame_parms->N_RB_DL*24);
@@ -388,6 +389,7 @@ void mch_extract_rbs(int **rxdataF,
memcpy((void*)&dl_ch_estimates_ext[aarx][symbol*(frame_parms->N_RB_DL*12)],
(void*)&dl_ch_estimates[aarx][(symbol*frame_parms->ofdm_symbol_size)],
frame_parms->N_RB_DL*48);
}
}
openair1/SIMULATION/LTE_PHY/mbmssim.c
+20 -6
View File
@@ -128,7 +128,7 @@ int main(int argc, char **argv)
char c;
int i,l,aa,aarx,k;
int i,l,l2,aa,aarx,k;
double sigma2, sigma2_dB=0,SNR,snr0=-2.0,snr1=0.0;
uint8_t snr1set=0;
double snr_step=1,input_snr_step=1;
@@ -538,11 +538,25 @@ int main(int argc, char **argv)
}
}
}
rx_pmch(PHY_vars_UE,
0,
subframe%10,
l);
if (l==6)
for (l2=2;l2<7;l2++)
rx_pmch(PHY_vars_UE,
0,
subframe%10,
l2);
if (l==6)
for (l2=2;l2<7;l2++)
rx_pmch(PHY_vars_UE,
0,
subframe%10,
l2);
if (l==11)
for (l2=7;l2<12;l2++)
rx_pmch(PHY_vars_UE,
0,
subframe%10,
l2);
}
PHY_vars_UE->dlsch_ue_MCH[0]->harq_processes[0]->G = get_G(&PHY_vars_UE->lte_frame_parms,