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adding comments to clarify that DMRS samples generated for channel estimation at reception already takes into account complex conjugate needed for said estimation

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This commit is contained in:
francescomani
2024-02-29 18:59:48 +01:00
parent c99db698ce
commit c464c27f63
3 changed files with 34 additions and 17 deletions
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openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+10 -2
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@@ -110,8 +110,16 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
}
if (pusch_pdu->transform_precoding == transformPrecoder_disabled) {
nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol], (int32_t *)pilot, (1000+p), 0, nb_rb_pusch,
(pusch_pdu->bwp_start + pusch_pdu->rb_start)*NR_NB_SC_PER_RB, pusch_pdu->dmrs_config_type);
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
nr_pusch_dmrs_rx(gNB,
Ns,
gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol],
(int32_t *)pilot,
(1000 + p),
0,
nb_rb_pusch,
(pusch_pdu->bwp_start + pusch_pdu->rb_start) * NR_NB_SC_PER_RB,
pusch_pdu->dmrs_config_type);
} else { // if transform precoding or SC-FDMA is enabled in Uplink
// NR_SC_FDMA supports type1 DMRS so only 6 DMRS REs per RB possible
const uint16_t index = get_index_for_dmrs_lowpapr_seq(nb_rb_pusch * (NR_NB_SC_PER_RB/2));