5G NR performance improvements for low SNR conditions

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -474,7 +474,7 @@ int main(int argc, char **argv)
     case 'q':
       mcs_table = atoi(optarg);
       break;
-      
+
     case 'r':
       nb_rb = atoi(optarg);
       break;
@@ -601,7 +601,7 @@ int main(int argc, char **argv)
 
     default:
     case 'h':
-      printf("%s -h(elp) -p(extended_prefix) -N cell_id -f output_filename -F input_filename -g channel_model -n n_frames -s snr0 -S snr1 -x transmission_mode -y TXant -z RXant -i Intefrence0 -j Interference1 -A interpolation_file -C(alibration offset dB) -N CellId -Z Enable SC-FDMA in Uplink \n", argv[0]);
+      printf("%s -h(elp) -p(extended_prefix) -N cell_id -f output_filename -F input_filename -g channel_model -i Intefrence0 -j Interference1 -n n_frames -s snr0 -S snr1 -t Delayspread -x transmission_mode -y TXant -z RXant -A interpolation_file -C(alibration offset dB) -N CellId -Z Enable SC-FDMA in Uplink \n", argv[0]);
       //printf("-d Use TDD\n");
       printf("-d Introduce delay in terms of number of samples\n");
       printf("-f Number of frames to simulate\n");
@@ -624,7 +624,7 @@ int main(int argc, char **argv)
       //printf("-C Generate Calibration information for Abstraction (effective SNR adjustment to remove Pe bias w.r.t. AWGN)\n");
       printf("-F Input filename (.txt format) for RX conformance testing\n");
       printf("-G Offset of samples to read from file (0 default)\n");
-      printf("-L <log level, 0(errors), 1(warning), 2(info) 3(debug) 4 (trace)>\n"); 
+      printf("-L <log level, 0(errors), 1(warning), 2(info) 3(debug) 4 (trace)>\n");
       printf("-I Maximum LDPC decoder iterations\n");
       printf("-M Multiple SSB positions in burst\n");
       printf("-N Nid_cell\n");
@@ -730,6 +730,7 @@ int main(int argc, char **argv)
   gNB->UL_INFO.rx_ind.number_of_pdus = 0;
   gNB->UL_INFO.crc_ind.number_crcs = 0;
   gNB->max_ldpc_iterations = max_ldpc_iterations;
+  gNB->pusch_thres = -20;
   frame_parms = &gNB->frame_parms; //to be initialized I suppose (maybe not necessary for PBCH)
 
   frame_parms->N_RB_DL = N_RB_DL;