Add EPRE measurement to PUSCH decoder

lib/include/srslte/phy/phch/pusch.h

@@ -96,6 +96,7 @@ typedef struct SRSLTE_API {
   bool               crc;
   float              avg_iterations_block;
   float              evm;
+  float              epre_dbfs;
 } srslte_pusch_res_t;
 
 SRSLTE_API int srslte_pusch_init_ue(srslte_pusch_t* q, uint32_t max_prb);

lib/include/srslte/phy/phch/pusch_cfg.h

@@ -78,6 +78,7 @@ typedef struct SRSLTE_API {
   bool     meas_time_en;
   uint32_t meas_time_value;
 
+  bool meas_epre_en;
   bool meas_ta_en;
   bool meas_evm_en;
 

lib/src/phy/phch/pusch.c

@@ -489,6 +489,13 @@ int srslte_pusch_decode(srslte_pusch_t*        q,
       return SRSLTE_ERROR;
     }
 
+    // Measure Energy per Resource Element
+    if (cfg->meas_epre_en) {
+      out->epre_dbfs = srslte_convert_power_to_dB(srslte_vec_avg_power_cf(q->d, n));
+    } else {
+      out->epre_dbfs = NAN;
+    }
+
     /* extract channel estimates */
     n = pusch_get(q, &cfg->grant, channel->ce, q->ce, sf->shortened);
     if (n != cfg->grant.nof_re) {
@@ -602,6 +609,11 @@ uint32_t srslte_pusch_rx_info(srslte_pusch_cfg_t*    cfg,
 
   len = srslte_print_check(str, str_len, len, ", snr=%.1f dB", chest_res->snr_db);
 
+  // Append Energy Per Resource Element
+  if (cfg->meas_epre_en) {
+    len = srslte_print_check(str, str_len, len, ", epre=%.1f dBfs", res->epre_dbfs);
+  }
+
   // Append Time Aligment information if available
   if (cfg->meas_ta_en) {
     len = srslte_print_check(str, str_len, len, ", ta=%.1f us", chest_res->ta_us);

srsenb/hdr/phy/phy_interfaces.h

@@ -53,6 +53,7 @@ struct phy_args_t {
   std::string equalizer_mode      = "mmse";
   float       estimator_fil_w     = 1.0f;
   bool        pregenerate_signals = false;
+  bool        pusch_meas_epre     = true;
   bool        pusch_meas_evm      = true;
   bool        pusch_meas_ta       = true;
 

srsenb/src/phy/phy_ue_db.cc

@@ -101,6 +101,7 @@ inline void phy_ue_db::_set_common_config_rnti(uint16_t rnti)
     scell_info.phy_cfg.ul_cfg.pucch.rnti                          = rnti;
     scell_info.phy_cfg.ul_cfg.pusch.rnti                          = rnti;
     scell_info.phy_cfg.ul_cfg.pusch.meas_time_en                  = true;
+    scell_info.phy_cfg.ul_cfg.pusch.meas_epre_en                  = phy_args->pusch_meas_epre;
     scell_info.phy_cfg.ul_cfg.pusch.meas_ta_en                    = phy_args->pusch_meas_ta;
     scell_info.phy_cfg.ul_cfg.pusch.meas_evm_en                   = phy_args->pusch_meas_evm;
     scell_info.phy_cfg.ul_cfg.pucch.threshold_format1             = SRSLTE_PUCCH_DEFAULT_THRESHOLD_FORMAT1;