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OTA synchronization for TDD. Added PSS position computation for testing on EURECOM CRAN.

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This commit is contained in:
Raymond Knopp
2018-02-04 02:18:24 -08:00
parent 9e69e729c5
commit f9aba7ac0f
1 changed files with 13 additions and 10 deletions
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targets/RT/USER/lte-ru.c
+12 -9
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@@ -1869,20 +1869,23 @@ void *ru_thread_synch(void *arg) {
sync_pos2 = sync_pos - fp->nb_prefix_samples; sync_pos2 = sync_pos - fp->nb_prefix_samples;
else else
sync_pos2 = sync_pos + (fp->samples_per_tti*10) - fp->nb_prefix_samples; sync_pos2 = sync_pos + (fp->samples_per_tti*10) - fp->nb_prefix_samples;
int sync_pos_slot;
if (fp->frame_type == FDD) { if (fp->frame_type == FDD) {
// PSS is hypothesized in last symbol of first slot in Frame // PSS is hypothesized in last symbol of first slot in Frame
int sync_pos_slot = (fp->samples_per_tti>>1) - fp->ofdm_symbol_size - fp->nb_prefix_samples; sync_pos_slot = (fp->samples_per_tti>>1) - fp->ofdm_symbol_size - fp->nb_prefix_samples;
if (sync_pos2 >= sync_pos_slot)
ru->rx_offset = sync_pos2 - sync_pos_slot;
else
ru->rx_offset = (fp->samples_per_tti*10) + sync_pos2 - sync_pos_slot;
} }
else { else {
// PSS is hypothesized in 2nd symbol of third slot in Frame (S-subframe)
sync_pos_slot = fp->samples_per_tti +
(fp->ofdm_symbol_size<<1) +
fp->nb_prefix_samples0 +
(fp->nb_prefix_samples);
} }
if (sync_pos2 >= sync_pos_slot)
ru->rx_offset = sync_pos2 - sync_pos_slot;
else
ru->rx_offset = (fp->samples_per_tti*10) + sync_pos2 - sync_pos_slot;
LOG_I(PHY,"Estimated sync_pos %d, peak_val %d => timing offset %d\n",sync_pos,peak_val,ru->rx_offset); LOG_I(PHY,"Estimated sync_pos %d, peak_val %d => timing offset %d\n",sync_pos,peak_val,ru->rx_offset);