diff --git a/openair1/PHY/MODULATION/slot_fep_nr.c b/openair1/PHY/MODULATION/slot_fep_nr.c
index 9c77fd765df13cc1a1592129084fd33fce9ca435..5a6a5ed62573b771c96d3307859b21dc3398b744 100644
--- a/openair1/PHY/MODULATION/slot_fep_nr.c
+++ b/openair1/PHY/MODULATION/slot_fep_nr.c
@@ -107,7 +107,7 @@ int nr_slot_fep(PHY_VARS_NR_UE *ue,
   rx_offset += frame_parms->ofdm_symbol_size * symbol;
 
   // use OFDM symbol from within 1/8th of the CP to avoid ISI
-  //rx_offset -= nb_prefix_samples / 8;
+  rx_offset -= nb_prefix_samples / 8;
 
 #ifdef DEBUG_FEP
   //  if (ue->frame <100)
@@ -296,7 +296,7 @@ int nr_slot_fep_ul(NR_DL_FRAME_PARMS *frame_parms,
   // offset of n-th OFDM symbol
   rxdata_offset += symbol * (frame_parms->ofdm_symbol_size + nb_prefix_samples);
   // use OFDM symbol from within 1/8th of the CP to avoid ISI
-  //rxdata_offset -= nb_prefix_samples / 8;
+  rxdata_offset -= nb_prefix_samples / 8;
 
   int16_t *rxdata_ptr;
 
diff --git a/openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c b/openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c
index 5ac5a5fa35411d3dfe9ec88db1267ef207d7399e..d3e33a91a889e7803186ee0dd27032b0f7dc1398 100644
--- a/openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c
+++ b/openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c
@@ -45,7 +45,7 @@ int nr_est_timing_advance_pusch(PHY_VARS_gNB* gNB, int UE_id)
   NR_gNB_PUSCH *gNB_pusch_vars   = gNB->pusch_vars[UE_id];
   int32_t **ul_ch_estimates_time = gNB_pusch_vars->ul_ch_estimates_time;
   
-  int sync_pos = 0; // frame_parms->nb_prefix_samples / 8;
+  int sync_pos = frame_parms->nb_prefix_samples / 8;
 
   for (i = 0; i < frame_parms->ofdm_symbol_size; i++) {
     int temp = 0;
diff --git a/openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c b/openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c
index 475d4180831e9afc7d43c0c1668f233e1a4b1db7..0318ed6478c6d7972120b506005fd70b361e970b 100644
--- a/openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c
+++ b/openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c
@@ -82,7 +82,7 @@ void nr_adjust_synch_ue(NR_DL_FRAME_PARMS *frame_parms,
   // do not filter to have proactive timing adjustment
   //max_pos_fil = max_pos;
 
-      diff = max_pos_fil; // - (frame_parms->nb_prefix_samples>>3);
+      diff = max_pos_fil - (frame_parms->nb_prefix_samples>>3);
 
       if (frame_parms->freq_range==nr_FR2) 
 		sync_offset = 2;