TA estimate correction factor calibrated for all bandwidths

lib/src/phy/phch/prach.c

@@ -654,7 +654,15 @@ int srslte_prach_detect_offset(srslte_prach_t *p,
               peak_to_avg[*n_indices] = p->peak_values[j] / corr_ave;
             }
             if (t_offsets) {
-              t_offsets[*n_indices] = (float) p->peak_offsets[j] * p->T_seq / p->N_zc;
+              float corr = 1.8;
+              if (p->peak_offsets[j] > 30) {
+                corr = 1.9;
+              }
+              if (p->peak_offsets[j] > 250) {
+                corr = 1.91;
+              }
+
+              t_offsets[*n_indices] = corr*p->peak_offsets[j]/(DELTA_F_RA * p->N_zc);
             }
             (*n_indices)++;
           }

srsenb/src/mac/mac.cc

@@ -489,7 +489,7 @@ int mac::rach_detected(uint32_t tti, uint32_t preamble_idx, uint32_t time_adv)
 
   // Save RA info
   pending_rars[ra_id].preamble_idx = preamble_idx;
-  pending_rars[ra_id].ta_cmd       = 2*time_adv;
+  pending_rars[ra_id].ta_cmd       = time_adv;
   pending_rars[ra_id].temp_crnti   = last_rnti;
 
   // Add new user to the scheduler so that it can RX/TX SRB0

srsue/src/phy/prach.cc

@@ -191,8 +191,8 @@ cf_t *prach::generate(float cfo, uint32_t *nof_sf, float *target_power) {
       *target_power = target_power_dbm;
     }
 
-    Info("PRACH: Transmitted preamble=%d, CFO=%.2f KHz, nof_sf=%d, target_power=%.1f dBm\n",
+    Info("PRACH: Transmitted preamble=%d, tti=%d, CFO=%.2f KHz, nof_sf=%d, target_power=%.1f dBm\n",
-         preamble_idx, cfo*15, nsf, target_power_dbm);
+         preamble_idx, transmitted_tti, cfo*15, nsf, target_power_dbm);
     preamble_idx = -1;
 
     return signal_buffer;