Update the time channel statistics "dl_ch_estimates" in nr_pbch_channel_estimation

- it shall be updated at every last PBCH symbol
- this fixes stability issues with the FDD mode

openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c

@@ -445,7 +445,7 @@ int nr_pbch_channel_estimation(PHY_VARS_NR_UE *ue,
       assert(0);
     }
 
-    if( symbol == 3)
+    if( dmrss == 2) // update time statistics for last PBCH symbol
     {
         // do ifft of channel estimate
         for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++)