enb,ue: add cmdline arg to enable usage of default LTE sample rate

some RF boards might have issues with the sharp filters that are needed
for the reduced sample rate operation that we use by default.

This switch allows to use the default LTE sampling rates and
configure this at run-time, not compile time.

srsenb/hdr/phy/phy_interfaces.h

@@ -47,7 +47,6 @@ struct phy_args_t {
   std::string            type;
   srslte::phy_log_args_t log;
 
-  float       sampling_rate_hz    = 0.0f;
   float       max_prach_offset_us = 10;
   int         pusch_max_its       = 10;
   bool        pusch_8bit_decoder  = false;

srsenb/src/main.cc

@@ -58,6 +58,7 @@ void parse_args(all_args_t* args, int argc, char* argv[])
   string mcc;
   string mnc;
   string enb_id;
+  bool   use_standard_lte_rates = false;
 
   // Command line only options
   bpo::options_description general("General options");
@@ -198,6 +199,7 @@ void parse_args(all_args_t* args, int argc, char* argv[])
     ("expert.max_prach_offset_us", bpo::value<float>(&args->phy.max_prach_offset_us)->default_value(30), "Maximum allowed RACH offset (in us)")
     ("expert.equalizer_mode", bpo::value<string>(&args->phy.equalizer_mode)->default_value("mmse"), "Equalizer mode")
     ("expert.estimator_fil_w", bpo::value<float>(&args->phy.estimator_fil_w)->default_value(0.1), "Chooses the coefficients for the 3-tap channel estimator centered filter.")
+    ("expert.lte_sample_rates", bpo::value<bool>(&use_standard_lte_rates)->default_value(false), "Whether to use default LTE sample rates instead of shorter variants.")
     ("expert.rrc_inactivity_timer", bpo::value<uint32_t>(&args->general.rrc_inactivity_timer)->default_value(30000), "Inactivity timer in ms.")
     ("expert.print_buffer_state", bpo::value<bool>(&args->general.print_buffer_state)->default_value(false), "Prints on the console the buffer state every 10 seconds")
     ("expert.eea_pref_list", bpo::value<string>(&args->general.eea_pref_list)->default_value("EEA0, EEA2, EEA1"), "Ordered preference list for the selection of encryption algorithm (EEA) (default: EEA0, EEA2, EEA1).")
@@ -396,6 +398,8 @@ void parse_args(all_args_t* args, int argc, char* argv[])
     cout << "Failed to read DRB configuration file " << args->enb_files.drb_config << " - exiting" << endl;
     exit(1);
   }
+
+  srslte_use_standard_symbol_size(use_standard_lte_rates);
 }
 
 static bool do_metrics = false;

srsue/src/main.cc

@@ -61,6 +61,8 @@ string config_file;
 
 static int parse_args(all_args_t* args, int argc, char* argv[])
 {
+  bool use_standard_lte_rates = false;
+
   // Command line only options
   bpo::options_description general("General options");
 
@@ -391,6 +393,10 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
      bpo::value<uint32_t>(&args->phy.nof_out_of_sync_events)->default_value(20),
      "Number of PHY out-sync events before sending an out-sync event to RRC")
 
+    ("expert.lte_sample_rates",
+     bpo::value<bool>(&use_standard_lte_rates)->default_value(false),
+     "Whether to use default LTE sample rates instead of shorter variants.")
+
     // UE simulation args
     ("sim.airplane_t_on_ms",
      bpo::value<int>(&args->stack.nas.sim.airplane_t_on_ms)->default_value(-1),
@@ -576,6 +582,8 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
     args->stack.sync_queue_size = MULTIQUEUE_DEFAULT_CAPACITY;
   }
 
+  srslte_use_standard_symbol_size(use_standard_lte_rates);
+
   return SRSLTE_SUCCESS;
 }