Optimization for unused symbols in NR UE

After processing TX frequency domain data skip IFFT call for symbols that aren't
used, the time domain buffer is memset instead.

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -1091,11 +1091,16 @@ printf("%d\n", slot);
                          frame_parms->nb_prefix_samples,
                          CYCLIC_PREFIX);
           } else {
+            bool was_symbol_used[NR_NUMBER_OF_SYMBOLS_PER_SLOT];
+            for (int i = 0; i < 14; i++) {
+              was_symbol_used[i] = true;
+            }
             nr_normal_prefix_mod(&gNB->common_vars.txdataF[0][aa][txdataF_offset],
                                  &txdata[aa][slot_offset],
                                  14,
                                  frame_parms,
-                                 slot);
+                                 slot,
+                                 was_symbol_used);
           }
         }
         if (n_trials==1) {

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -1525,7 +1525,7 @@ int main(int argc, char *argv[])
       printStatIndent(&gNB->ulsch_decoding_stats,"ULSCH total decoding time");
 
       printf("\nUE TX\n");
-      for (int i = PHY_PROC_TX; i <= ULSCH_ENCODING_STATS; i++) {
+      for (int i = PHY_PROC_TX; i <= OFDM_MOD_STATS; i++) {
         printStatIndent(&UE->phy_cpu_stats.cpu_time_stats[i], UE->phy_cpu_stats.cpu_time_stats[i].meas_name);
       }
       printStatIndent(&gNB->rx_srs_stats,"RX SRS time");