modifications to eMBMS-related L1 processing. mbmssim now works again...

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.

openair1/PHY/LTE_ESTIMATION/lte_dl_mbsfn_channel_estimation.c

@@ -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

@@ -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

@@ -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,