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Implementation of delay estimation in NFAPI_NR_DMRS_TYPE2_linear_interp() at UE

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This commit is contained in:
rmagueta
2023-09-04 17:09:35 +01:00
parent e0ab96eedc
commit 087f9a0bc2
1 changed files with 29 additions and 17 deletions
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openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
+29 -17
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@@ -1536,35 +1536,46 @@ void NFAPI_NR_DMRS_TYPE2_linear_interp(NR_DL_FRAME_PARMS *frame_parms,
{
int re_offset = bwp_start_subcarrier % frame_parms->ofdm_symbol_size;
c16_t *dl_ch0 = dl_ch;
c16_t ch = {0};
c16_t ch_l = {0};
c16_t ch_r = {0};
c16_t dl_ls_est[frame_parms->ofdm_symbol_size] __attribute__((aligned(32)));
memset(dl_ls_est, 0, sizeof(dl_ls_est));
for (int pilot_cnt = 0; pilot_cnt < 4 * nb_rb_pdsch; pilot_cnt += 2) {
ch_l = c16mulShift(*pil, rxF[re_offset], 15);
c16_t ch_l = c16mulShift(*pil, rxF[re_offset], 15);
#ifdef DEBUG_PDSCH
printf("pilot %3d: pil -> (%6d,%6d), rxF -> (%4d,%4d), ch -> (%4d,%4d) \n", pilot_cnt, pil->r, pil->i, rxF[re_offset].r, rxF[re_offset].i, ch_l.r, ch_l.i);
#endif
pil++;
re_offset = (re_offset + 1) % frame_parms->ofdm_symbol_size;
ch_r = c16mulShift(*pil, rxF[re_offset], 15);
c16_t ch_r = c16mulShift(*pil, rxF[re_offset], 15);
#ifdef DEBUG_PDSCH
printf("pilot %3d: pil -> (%6d,%6d), rxF -> (%4d,%4d), ch -> (%4d,%4d) \n", pilot_cnt, pil->r, pil->i, rxF[re_offset].r, rxF[re_offset].i, ch_r.r, ch_r.i);
#endif
ch = c16addShift(ch_l, ch_r, 1);
if (pilot_cnt == 1) {
multadd_real_vector_complex_scalar(filt16_dl_first_type2, (int16_t *)&ch, (int16_t *)dl_ch, 16);
dl_ch += 3;
} else if (pilot_cnt == (4 * nb_rb_pdsch - 1)) {
multadd_real_vector_complex_scalar(filt16_dl_last_type2, (int16_t *)&ch, (int16_t *)dl_ch, 16);
} else {
multadd_real_vector_complex_scalar(filt16_dl_middle_type2, (int16_t *)&ch, (int16_t *)dl_ch, 16);
dl_ch += 6;
c16_t ch = c16addShift(ch_l, ch_r, 1);
for (int k = 3 * pilot_cnt; k < (3 * pilot_cnt) + 6; k++) {
dl_ls_est[k] = ch;
}
pil++;
re_offset = (re_offset + 5) % frame_parms->ofdm_symbol_size;
}
nr_est_delay_pdsch(frame_parms, dl_ls_est, delay);
int delay_idx = get_delay_idx(delay->est_delay, MAX_DELAY_COMP);
c16_t *dl_delay_table = frame_parms->delay_table[delay_idx];
for (int pilot_cnt = 0; pilot_cnt < 6 * nb_rb_pdsch; pilot_cnt++) {
if (pilot_cnt == 0) { // Treat first pilot
c16multaddVectRealComplex(filt16_dl_first, &dl_ls_est[pilot_cnt << 1], dl_ch, 16);
} else if (pilot_cnt == 6 * nb_rb_pdsch - 1) { // Treat last pilot
c16multaddVectRealComplex(filt16_dl_last, &dl_ls_est[pilot_cnt << 1], dl_ch, 16);
} else { // Treat middle pilots
c16multaddVectRealComplex(filt16_dl_middle, &dl_ls_est[pilot_cnt << 1], dl_ch, 16);
if (pilot_cnt % 2 == 0) {
dl_ch += 4;
}
}
}
// check if PRB crosses DC and improve estimates around DC
if ((bwp_start_subcarrier < frame_parms->ofdm_symbol_size) && (bwp_start_subcarrier + nb_rb_pdsch * 12 >= frame_parms->ofdm_symbol_size) && (p < 2)) {
dl_ch = dl_ch0;
@@ -1573,9 +1584,9 @@ void NFAPI_NR_DMRS_TYPE2_linear_interp(NR_DL_FRAME_PARMS *frame_parms,
dl_ch = memset(dl_ch, 0, sizeof(c16_t) * 10);
dl_ch--;
ch_r = *dl_ch;
c16_t ch_r = *dl_ch;
dl_ch += 11;
ch_l = *dl_ch;
c16_t ch_l = *dl_ch;
// for proper allignment of SIMD vectors
if ((frame_parms->N_RB_DL & 1) == 0) {
@@ -1776,7 +1787,8 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
bwp_start_subcarrier,
nb_rb_pdsch,
delta,
p);
p,
&delay);
} else if (config_type == NFAPI_NR_DMRS_TYPE1) {
NFAPI_NR_DMRS_TYPE1_average_prb(&ue->frame_parms,