Increased sync threshold. Fixed some memory issues

lte/examples/pdsch_ue.c

@@ -273,7 +273,7 @@ int main(int argc, char **argv) {
   
     if ((sf_cnt%10)==0) {
       printf("CFO: %+6.2f KHz, SFO: %+6.2f Khz, SNR: %5.1f dB, NOI: %.2f, "
-            "PDCCH-Miss: %d/%d, PDSCH-BLER: %5.2f%% (%d blocks)\n",
+            "PDCCH-Miss: %d/%d, PDSCH-BLER: %5.2f%% (%d blocks)\r",
             ue_sync_get_cfo(&ue_sync)/1000, ue_sync_get_sfo(&ue_sync)/1000, 
             10*log10f(snr), pdsch_average_noi(&ue_dl.pdsch),
             nof_trials-ue_dl.nof_pdcch_detected, nof_trials,

lte/phy/lib/sync/src/pss.c

@@ -255,17 +255,10 @@ int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value)
 
     /* Find maximum of the absolute value of the correlation */
     corr_peak_pos = vec_max_abs_ci(q->conv_output, conv_output_len-1);
-    if (corr_peak_pos <= q->frame_size) {
     if (corr_peak_value) {
       *corr_peak_value = cabsf(q->conv_output[corr_peak_pos]);
     }
     ret = (int) corr_peak_pos;                
-    } else {
-      ret = q->frame_size; 
-      if (corr_peak_value) {
-        *corr_peak_value = 0.0; 
-      }
-    }
   } 
   return ret;
 }

lte/phy/lib/sync/src/sync.c

@@ -195,7 +195,12 @@ int sync_sss(sync_t *q, cf_t *input, uint32_t peak_pos) {
   sss_synch_set_N_id_2(&q->sss, q->N_id_2);
 
   if (q->detect_cp) {
+    if (peak_pos - q->fft_size - CP_EXT(q->fft_size)) {
       q->cp = detect_cp(q, input, peak_pos);
+    } else {
+      INFO("Not enough room to detect CP length. Peak position: %d\n", peak_pos);
+      return LIBLTE_ERROR; 
+    }
   }
   
   /* Make sure we have enough room to find SSS sequence */
@@ -256,6 +261,7 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
       return LIBLTE_ERROR; 
     }
     if (q->normalize_en                         && 
+        peak_pos               <  q->frame_size && 
         peak_pos + find_offset >= q->fft_size ) 
     {
       /* Compute the energy of the received PSS sequence to normalize */
@@ -290,7 +296,9 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
         }
       }
       // Make sure we have enough space to estimate CFO
-      if (find_offset + peak_pos >= q->fft_size + CP_EXT(q->fft_size)) {
+      if (peak_pos               <  q->frame_size && 
+          peak_pos + find_offset >= q->fft_size) 
+      {
         q->cfo = pss_synch_cfo_compute(&q->pss, &input[find_offset+peak_pos-q->fft_size]);
       } else {
         INFO("No space for CFO computation. Frame starts at \n",peak_pos);
@@ -301,7 +309,7 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
       ret = 0;
     }
     
-    printf("SYNC ret=%d N_id_2=%d pos=%d peak=%.2f/%.2f=%.2f threshold=%.2f sf_idx=%d offset=%d\n",
+    INFO("SYNC ret=%d N_id_2=%d pos=%d peak=%.2f/%.2f=%.2f threshold=%.2f sf_idx=%d offset=%d\n",
           ret, q->N_id_2, peak_pos, peak_unnormalized,energy,q->peak_value, q->threshold, q->sf_idx, find_offset);
 
   } else if (lte_N_id_2_isvalid(q->N_id_2)) {

lte/phy/lib/ue/src/ue_sync.c

@@ -46,9 +46,9 @@ cf_t dummy[MAX_TIME_OFFSET];
 #define CURRENT_SLOTLEN_RE SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
 #define CURRENT_SFLEN_RE SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
 
-#define FIND_THRESHOLD          1.0
-#define TRACK_THRESHOLD         0.4
-#define TRACK_MAX_LOST          5
+#define FIND_THRESHOLD          1.4
+#define TRACK_THRESHOLD         0.7
+#define TRACK_MAX_LOST          10
 
 
 int ue_sync_init(ue_sync_t *q, 
@@ -190,7 +190,10 @@ int track_peak_ok(ue_sync_t *q, uint32_t track_idx) {
           q->sf_idx, sync_get_sf_idx(&q->strack), 
          q->strack.m0, q->strack.m0_value, q->strack.m1, q->strack.m1_value);
 
-    /* FIXME: What should we do in this case? */
+    /* FIXME: What should we do in this case? 
+     * If the threshold is high enough, an OK peak means it is likely to be true
+     * Otherwise, maybe we should not trust the new sf_idx. 
+     */
     q->sf_idx = sync_get_sf_idx(&q->strack);
     //q->state = SF_FIND; 
   } else {
@@ -223,7 +226,7 @@ int track_peak_no(ue_sync_t *q) {
   /* if we missed too many PSS go back to FIND */
   q->frame_no_cnt++; 
   if (q->frame_no_cnt >= TRACK_MAX_LOST) {
-    INFO("\n%d frames lost. Going back to FIND\n", (int) q->frame_no_cnt);
+    printf("\n%d frames lost. Going back to FIND\n", (int) q->frame_no_cnt);
     q->state = SF_FIND;
   } else {
     INFO("Tracking peak not found. Peak %.3f, %d lost\n",