fixes in how sync for two frames is handled in pss functions, it works

openair1/PHY/NR_REFSIG/pss_nr.h

@@ -138,7 +138,7 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change);
 int pss_search_time_nr(int **rxdata, ///rx data in time domain
                        NR_DL_FRAME_PARMS *frame_parms,
 		       int fo_flag,
-                       int corr_samples,
+                       int is,
                        int *eNB_id,
 		       int *f_off);
 

openair1/PHY/NR_UE_TRANSPORT/pss_nr.c

@@ -608,14 +608,10 @@ void restore_frame_context_pss_nr(NR_DL_FRAME_PARMS *frame_parms_ue, int rate_ch
 *
 ********************************************************************/
 
-void decimation_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int rate_change, int is, int **rxdata)
+void decimation_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int rate_change, int **rxdata)
 {
-  int samples_for_frame;
   NR_DL_FRAME_PARMS *frame_parms = &(PHY_vars_UE->frame_parms);
-  if (is==0)
-    samples_for_frame = frame_parms->samples_per_frame + frame_parms->ofdm_symbol_size;
-  else
-    samples_for_frame = frame_parms->samples_per_frame;
+  int samples_for_frame = 2*frame_parms->samples_per_frame;
 
   AssertFatal(frame_parms->samples_per_tti > 3839,"Illegal samples_per_tti %d\n",frame_parms->samples_per_tti);
 
@@ -630,11 +626,11 @@ void decimation_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int rate_change, int is,
 /* build with cic filter does not work properly. Performances are significantly deteriorated */
 #ifdef CIC_DECIMATOR
 
-  cic_decimator((int16_t *)&(PHY_vars_UE->common_vars.rxdata[0][is*frame_parms->samples_per_frame]), (int16_t *)&(rxdata[0][0]),
+  cic_decimator((int16_t *)&(PHY_vars_UE->common_vars.rxdata_is[0][0]), (int16_t *)&(rxdata[0][0]),
                             samples_for_frame, rate_change, CIC_FILTER_STAGE_NUMBER, 0, FIR_RATE_CHANGE);
 #else
 
-  fir_decimator((int16_t *)&(PHY_vars_UE->common_vars.rxdata[0][frame_parms->samples_per_frame]), (int16_t *)&(rxdata[0][0]),
+  fir_decimator((int16_t *)&(PHY_vars_UE->common_vars.rxdata_is[0][0]), (int16_t *)&(rxdata[0][0]),
                             samples_for_frame, rate_change, 0);
 
 #endif
@@ -666,44 +662,36 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
 {
   NR_DL_FRAME_PARMS *frame_parms = &(PHY_vars_UE->frame_parms);
   int synchro_position;
-  int **rxdata;
+  int **rxdata = NULL;
   int fo_flag = PHY_vars_UE->UE_fo_compensation;  // flag to enable freq offset estimation and compensation
-  int samples_for_frame;
-
-  // to take into account the possibility of PSS to be found between the two frames 
-  // the analysis of the first of two frames is extended by one symbol (duration of PSS)
-  if (is==0)
-    samples_for_frame = frame_parms->samples_per_frame + frame_parms->ofdm_symbol_size;
-  else
-    samples_for_frame = frame_parms->samples_per_frame;
 
 #ifdef DBG_PSS_NR
-  LOG_M("rxdata0_rand.m","rxd0_rand", &PHY_vars_UE->common_vars.rxdata[0][0], 2*frame_parms->samples_per_frame, 1, 1);
-#endif
 
-  rxdata = (int32_t**)malloc16(frame_parms->nb_antennas_rx*sizeof(int32_t*));
-  for (int aa=0; aa < frame_parms->nb_antennas_rx; aa++)
-      rxdata[aa] = (int32_t*) malloc16_clear( (samples_for_frame+8192)*sizeof(int32_t));
+  LOG_M("rxdata0_rand.m","rxd0_rand", &PHY_vars_UE->common_vars.rxdata_is[0][0], frame_parms->samples_per_frame, 1, 1);
+
+#endif
 
   if (rate_change != 1) {
 
+    rxdata = (int32_t**)malloc16(frame_parms->nb_antennas_rx*sizeof(int32_t*));
+
+    for (int aa=0; aa < frame_parms->nb_antennas_rx; aa++) {
+      rxdata[aa] = (int32_t*) malloc16_clear( (frame_parms->samples_per_frame+8192)*sizeof(int32_t));
+    }
 #ifdef SYNCHRO_DECIMAT
 
-    decimation_synchro_nr(PHY_vars_UE, rate_change, is, rxdata);
+    decimation_synchro_nr(PHY_vars_UE, rate_change, rxdata);
 
 #endif
   }
   else {
-    for (int aa=0; aa < frame_parms->nb_antennas_rx; aa++)
-      memcpy(&(rxdata[aa][0]),
-             &(PHY_vars_UE->common_vars.rxdata[aa][is*frame_parms->samples_per_frame]),
-             samples_for_frame*sizeof(int32_t));
 
+    rxdata = PHY_vars_UE->common_vars.rxdata_is;
   }
 
 #ifdef DBG_PSS_NR
 
-  LOG_M("rxdata0_des.m","rxd0_des", &rxdata[0][0], samples_for_frame,1,1);
+  LOG_M("rxdata0_des.m","rxd0_des", &rxdata[0][0], frame_parms->samples_per_frame,1,1);
 
 #endif
 
@@ -718,7 +706,7 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
   synchro_position = pss_search_time_nr(rxdata,
                                         frame_parms,
 					fo_flag,
-                                        samples_for_frame,
+                                        is,
                                         (int *)&PHY_vars_UE->common_vars.eNb_id,
 					(int *)&PHY_vars_UE->common_vars.freq_offset);
 
@@ -738,20 +726,26 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
 #endif
 
 #ifdef SYNCHRO_DECIMAT
-  if (rate_change != 1)
-    restore_frame_context_pss_nr(frame_parms, rate_change);  
-#endif
 
-  if (rxdata[0] != NULL) {
-      for (int aa=0;aa<frame_parms->nb_antennas_rx;aa++)
+  if (rate_change != 1) {
+
+    if (rxdata[0] != NULL) {
+
+      for (int aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
         free(rxdata[aa]);
+      }
 
       free(rxdata);
+    }
+
+    restore_frame_context_pss_nr(frame_parms, rate_change);  
   }
+#endif
 
   return synchro_position;
 }
 
+
 static inline int abs32(int x)
 {
   return (((int)((short*)&x)[0])*((int)((short*)&x)[0]) + ((int)((short*)&x)[1])*((int)((short*)&x)[1]));
@@ -777,7 +771,7 @@ static inline double angle64(int64_t x)
 *
 * PARAMETERS :   received buffer
 *                frame parameters
-*
+*https://www.ilpost.it/
 * RETURN :       position of detected pss
 *
 * DESCRIPTION :  Synchronisation on pss sequence is based on a time domain correlation between received samples and pss sequence
@@ -826,7 +820,7 @@ static inline double angle64(int64_t x)
 int pss_search_time_nr(int **rxdata, ///rx data in time domain
                        NR_DL_FRAME_PARMS *frame_parms,
 		       int fo_flag,
-                       int corr_samples,
+                       int is,
                        int *eNB_id,
 		       int *f_off)
 {
@@ -836,13 +830,18 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
   int64_t avg[NUMBER_PSS_SEQUENCE];
   double ffo_est=0;
 
-
-  unsigned int length = corr_samples;
+  // performing the correlation on a frame length plus one symbol for the first of the two frame
+  // to take into account the possibility of PSS in between the two frames 
+  unsigned int length;
+  if (is==0)
+    length = frame_parms->samples_per_frame + (2*frame_parms->ofdm_symbol_size);
+  else
+    length = frame_parms->samples_per_frame;
 
   AssertFatal(length>0,"illegal length %d\n",length);
   for (int i = 0; i < NUMBER_PSS_SEQUENCE; i++) AssertFatal(pss_corr_ue[i] != NULL,"pss_corr_ue[%d] not yet allocated! Exiting.\n", i);
 
-    
+  printf("%d\n\n",length);
   peak_value = 0;
   peak_position = 0;
   pss_source = 0;
@@ -878,7 +877,7 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
 
           /* perform correlation of rx data and pss sequence ie it is a dot product */
           result  = dot_product64((short*)primary_synchro_time_nr[pss_index], 
-				  (short*) &(rxdata[ar][n]), 
+				  (short*) &(rxdata[ar][n])+(is*frame_parms->samples_per_frame), 
 				  frame_parms->ofdm_symbol_size, 
 				  shift);
 	  pss_corr_ue[pss_index][n] += abs64(result);
@@ -912,13 +911,13 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
 	  int64_t result1,result2;
 	  // Computing cross-correlation at peak on half the symbol size for first half of data
 	  result1  = dot_product64((short*)primary_synchro_time_nr[pss_source], 
-				  (short*) &(rxdata[0][peak_position]), 
+				  (short*) &(rxdata[0][peak_position])+(is*frame_parms->samples_per_frame), 
 				  frame_parms->ofdm_symbol_size>>1, 
 				  shift);
 	  // Computing cross-correlation at peak on half the symbol size for data shifted by half symbol size 
 	  // as it is real and complex it is necessary to shift by a value equal to symbol size to obtain such shift
 	  result2  = dot_product64((short*)primary_synchro_time_nr[pss_source]+(frame_parms->ofdm_symbol_size), 
-				  (short*) &(rxdata[0][peak_position])+(frame_parms->ofdm_symbol_size), 
+				  (short*) &(rxdata[0][peak_position])+(frame_parms->ofdm_symbol_size+(is*frame_parms->samples_per_frame)), 
 				  frame_parms->ofdm_symbol_size>>1, 
 				  shift);
 
@@ -957,7 +956,10 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
     LOG_M("pss_corr_ue0.m","pss_corr_ue0",pss_corr_ue[0],length,1,6);
     LOG_M("pss_corr_ue1.m","pss_corr_ue1",pss_corr_ue[1],length,1,6);
     LOG_M("pss_corr_ue2.m","pss_corr_ue2",pss_corr_ue[2],length,1,6);
-    LOG_M("rxdata0.m","rxd0",rxdata[0],length,1,1); 
+    if (is)
+      LOG_M("rxdata1.m","rxd0",rxdata[frame_parms->samples_per_frame],length,1,1); 
+    else
+      LOG_M("rxdata0.m","rxd0",rxdata[0],length,1,1);
   } else {
     debug_cnt++;
   }

targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf

@@ -71,7 +71,7 @@ gNBs =
       UL_timeAlignmentTimerCommon                                   = "infinity";
       ServingCellConfigCommon_n_TimingAdvanceOffset                 = "n0"
       ServingCellConfigCommon_ssb_PositionsInBurst_PR               = 0x01;
-      ServingCellConfigCommon_ssb_periodicityServingCell            = 20;
+      ServingCellConfigCommon_ssb_periodicityServingCell            = 10;
       ServingCellConfigCommon_dmrs_TypeA_Position                   = 2;
       NIA_SubcarrierSpacing                                         = "kHz15"; 
       ServingCellConfigCommon_ss_PBCH_BlockPower                    = -60;