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Delay compensation for pusch_dmrs_type2

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This commit is contained in:
Roberto Louro Magueta
2023-03-06 10:16:01 +00:00
parent a96732e347
commit db1928573f
1 changed files with 14 additions and 3 deletions
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openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+14 -3
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@@ -302,10 +302,21 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
pil++;
c16_t ch = c16addShift(ch0, ch1, 1);
*max_ch = max(*max_ch, max(abs(ch.r), abs(ch.i)));
multadd_real_four_symbols_vector_complex_scalar(filt8_rep4, &ch, &ul_ch[n]);
ul_ch[n + 4] = ch;
ul_ch[n + 5] = ch;
multadd_real_four_symbols_vector_complex_scalar(filt8_rep4, &ch, &ul_ls_est[n]);
ul_ls_est[n + 4] = ch;
ul_ls_est[n + 5] = ch;
}
// Delay compensation
freq2time(symbolSize, (int16_t *)ul_ls_est, (int16_t *)gNB->pusch_vars[ul_id]->ul_ch_estimates_time[aarx]);
nr_est_timing_advance_pusch(&gNB->frame_parms, gNB->pusch_vars[ul_id]->ul_ch_estimates_time[aarx], &gNB->measurements.delay[ul_id]);
int delay = gNB->measurements.delay[ul_id].pusch_est_delay;
int delay_idx = get_delay_idx(-delay);
c16_t *ul_delay_table = gNB->frame_parms.ul_delay_table[delay_idx];
for (int n = 0; n < nb_rb_pusch * NR_NB_SC_PER_RB; n++) {
ul_ch[n] = c16mulShift(ul_ls_est[n], ul_delay_table[n % 6], 8);
}
}
else if (pusch_pdu->dmrs_config_type == pusch_dmrs_type1) { // this is case without frequency-domain linear interpolation, just take average of LS channel estimates of 6 DMRS REs and use a common value for the whole PRB