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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
View File
@@ -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));
openair1/PHY/NR_REFSIG/nr_dmrs_rx.c
+9 -11
View File
@@ -195,9 +195,7 @@ int nr_pdcch_dmrs_rx(PHY_VARS_NR_UE *ue,
}
int nr_pbch_dmrs_rx(int symbol,
unsigned int *nr_gold_pbch,
int32_t *output)
int nr_pbch_dmrs_rx(int symbol, unsigned int *nr_gold_pbch, int32_t *output)
{
int m,m0,m1;
uint8_t idx=0;
@@ -257,14 +255,14 @@ void nr_gen_ref_conj_symbols(uint32_t *in, uint32_t length, int16_t *output, uin
}
int nr_pusch_lowpaprtype1_dmrs_rx(PHY_VARS_gNB *gNB,
unsigned int Ns,
int16_t *dmrs_seq,
int32_t *output,
unsigned short p,
unsigned char lp,
unsigned short nb_pusch_rb,
uint32_t re_offset,
uint8_t dmrs_type)
unsigned int Ns,
int16_t *dmrs_seq,
int32_t *output,
unsigned short p,
unsigned char lp,
unsigned short nb_pusch_rb,
uint32_t re_offset,
uint8_t dmrs_type)
{
int8_t w, nb_dmrs;
int k;
openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
+15 -4
View File
@@ -658,7 +658,8 @@ int nr_pbch_dmrs_correlation(PHY_VARS_NR_UE *ue,
#endif
// generate pilot
nr_pbch_dmrs_rx(dmrss,ue->nr_gold_pbch[n_hf][ssb_index], &pilot[0]);
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
nr_pbch_dmrs_rx(dmrss, ue->nr_gold_pbch[n_hf][ssb_index], &pilot[0]);
for (int aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
@@ -898,7 +899,8 @@ int nr_pbch_channel_estimation(PHY_VARS_NR_UE *ue,
}
// generate pilot
nr_pbch_dmrs_rx(dmrss,ue->nr_gold_pbch[n_hf][ssb_index], &pilot[0]);
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
nr_pbch_dmrs_rx(dmrss, ue->nr_gold_pbch[n_hf][ssb_index], &pilot[0]);
for (int aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
@@ -1111,7 +1113,8 @@ void nr_pdcch_channel_estimation(PHY_VARS_NR_UE *ue,
dmrs_ref = BWPStart;
// generate pilot
int pilot[(nb_rb_coreset + dmrs_ref) * 3] __attribute__((aligned(16)));
nr_pdcch_dmrs_rx(ue,Ns,ue->nr_gold_pdcch[gNB_id][Ns][symbol], &pilot[0],2000,(nb_rb_coreset+dmrs_ref));
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
nr_pdcch_dmrs_rx(ue, Ns, ue->nr_gold_pdcch[gNB_id][Ns][symbol], &pilot[0], 2000, (nb_rb_coreset + dmrs_ref));
for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
@@ -1648,7 +1651,15 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
}
c16_t pilot[3280] __attribute__((aligned(16)));
nr_pdsch_dmrs_rx(ue, Ns, ue->nr_gold_pdsch[gNB_id][Ns][symbol][nscid], (int32_t *)pilot, 1000 + p, 0, nb_rb_pdsch + rb_offset, config_type);
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
nr_pdsch_dmrs_rx(ue,
Ns,
ue->nr_gold_pdsch[gNB_id][Ns][symbol][nscid],
(int32_t *)pilot,
1000 + p,
0,
nb_rb_pdsch + rb_offset,
config_type);
uint8_t nushift = 0;
if (config_type == NFAPI_NR_DMRS_TYPE1) {