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NR_UE: fix bug in timing adjustment

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This commit is contained in:
Thomas Schlichter
2021-10-27 17:30:05 +02:00
parent 107f20ad29
commit 2c2ba26553
2 changed files with 7 additions and 7 deletions
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executables/nr-ue.c
+2
View File
@@ -464,12 +464,14 @@ int computeSamplesShift(PHY_VARS_NR_UE *UE) {
if ( UE->rx_offset < UE->frame_parms.samples_per_frame/2 && if ( UE->rx_offset < UE->frame_parms.samples_per_frame/2 &&
UE->rx_offset > 0 ) { UE->rx_offset > 0 ) {
//LOG_I(PHY,"!!!adjusting -1 samples!!!\n"); //LOG_I(PHY,"!!!adjusting -1 samples!!!\n");
UE->rx_offset = 0; // reset so that it is not applied falsely in case of SSB being only in every second frame
return -1 ; return -1 ;
} }
if ( UE->rx_offset > UE->frame_parms.samples_per_frame/2 && if ( UE->rx_offset > UE->frame_parms.samples_per_frame/2 &&
UE->rx_offset < UE->frame_parms.samples_per_frame ) { UE->rx_offset < UE->frame_parms.samples_per_frame ) {
//LOG_I(PHY,"!!!adjusting +1 samples!!!\n"); //LOG_I(PHY,"!!!adjusting +1 samples!!!\n");
UE->rx_offset = 0; // reset so that it is not applied falsely in case of SSB being only in every second frame
return 1; return 1;
} }
openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c
+5 -7
View File
@@ -55,13 +55,14 @@ void nr_adjust_synch_ue(NR_DL_FRAME_PARMS *frame_parms,
LOG_D(PHY,"AbsSubframe %d: rx_offset (before) = %d\n",subframe,ue->rx_offset); LOG_D(PHY,"AbsSubframe %d: rx_offset (before) = %d\n",subframe,ue->rx_offset);
// we only use channel estimates from tx antenna 0 here // search for maximum position within the cyclic prefix
for (int i = 0; i < frame_parms->nb_prefix_samples; i++) { for (int i = -frame_parms->nb_prefix_samples/2; i < frame_parms->nb_prefix_samples/2; i++) {
int temp = 0; int temp = 0;
int j = (i < 0) ? (i + frame_parms->ofdm_symbol_size) : i;
for (int aa = 0; aa < frame_parms->nb_antennas_rx; aa++) { for (int aa = 0; aa < frame_parms->nb_antennas_rx; aa++) {
int Re = ((int16_t*)ue->pbch_vars[gNB_id]->dl_ch_estimates_time[aa])[(i<<1)]; int Re = ((int16_t*)ue->pbch_vars[gNB_id]->dl_ch_estimates_time[aa])[(j<<1)];
int Im = ((int16_t*)ue->pbch_vars[gNB_id]->dl_ch_estimates_time[aa])[1+(i<<1)]; int Im = ((int16_t*)ue->pbch_vars[gNB_id]->dl_ch_estimates_time[aa])[1+(j<<1)];
temp += (Re*Re/2) + (Im*Im/2); temp += (Re*Re/2) + (Im*Im/2);
} }
@@ -71,9 +72,6 @@ void nr_adjust_synch_ue(NR_DL_FRAME_PARMS *frame_parms,
} }
} }
if (max_pos > frame_parms->ofdm_symbol_size/2)
max_pos = max_pos - frame_parms->ofdm_symbol_size;
// filter position to reduce jitter // filter position to reduce jitter
if (clear == 1) if (clear == 1)
max_pos_fil = max_pos; max_pos_fil = max_pos;