Radio: fix frame overlap at start-of-burst

lib/src/radio/radio.cc

@@ -486,8 +486,6 @@ bool radio::tx_dev(const uint32_t& device_idx, rf_buffer_interface& buffer, cons
     srslte_timestamp_add(&tx_time, 0, tx_adv_sec);
   }
 
-  // Calculate transmission overlap/gap if it is not start of the burst
-  if (not is_start_of_burst) {
   // Calculates transmission time overlap with previous transmission
   srslte_timestamp_t ts_overlap = end_of_burst_time[device_idx];
   srslte_timestamp_sub(&ts_overlap, tx_time.full_secs, tx_time.frac_secs);
@@ -509,11 +507,19 @@ bool radio::tx_dev(const uint32_t& device_idx, rf_buffer_interface& buffer, cons
     tx_time       = end_of_burst_time[device_idx]; // Keeps same transmission time
     nof_samples   = nof_samples - past_nsamples;   // Subtracts the number of trimmed samples
 
-    } else if (past_nsamples < 0) {
+    // Prints discarded samples
+    log_h->debug("Detected RF overlap of %.1f us. Discarding %d samples. Power=%+.1f dBfs\n",
+                 srslte_timestamp_real(&ts_overlap) * 1.0e6,
+                 past_nsamples,
+                 srslte_convert_power_to_dB(srslte_vec_avg_power_cf(&buffer.get(0)[nof_samples], past_nsamples)));
+
+  } else if (past_nsamples < 0 and not is_start_of_burst) {
     // if the gap is bigger than TX_MAX_GAP_ZEROS, stop burst
     if (fabs(srslte_timestamp_real(&ts_overlap)) > tx_max_gap_zeros) {
+      log_h->info("Detected RF gap of %.1f us. Sending end-of-burst.\n", srslte_timestamp_real(&ts_overlap) * 1.0e6);
       tx_end();
     } else {
+      log_h->debug("Detected RF gap of %.1f us. Tx'ing zeroes.\n", srslte_timestamp_real(&ts_overlap) * 1.0e6);
       // Otherwise, transmit zeros
       uint32_t gap_nsamples = abs(past_nsamples);
       while (gap_nsamples > 0) {
@@ -540,7 +546,6 @@ bool radio::tx_dev(const uint32_t& device_idx, rf_buffer_interface& buffer, cons
       }
     }
   }
-  }
 
   // Save possible end of burst time
   srslte_timestamp_copy(&end_of_burst_time[device_idx], &tx_time);