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Consider PDSCH EPRE to DMRS EPRE in NR UE

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This commit is contained in:
Bartosz Podrygajlo
2025-08-22 15:59:52 +02:00
parent 207aac94d1
commit 598fbb5a24
9 changed files with 21 additions and 13 deletions
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common/utils/nr/nr_common.c
+2 -2
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@@ -1465,13 +1465,13 @@ frequency_range_t get_freq_range_from_band(uint16_t band)
return band <= 256 ? FR1 : FR2;
}
float get_beta_dmrs_pusch(int num_cdm_groups_no_data, pusch_dmrs_type_t dmrs_type)
float get_beta_dmrs(int num_cdm_groups_no_data, bool is_type2)
{
float beta_dmrs_pusch = 1.0;
if (num_cdm_groups_no_data == 2) {
beta_dmrs_pusch = powf(10.0, 3.0 / 20.0);
} else if (num_cdm_groups_no_data == 3) {
if (dmrs_type == pusch_dmrs_type2)
if (is_type2)
beta_dmrs_pusch = powf(10.0, 4.77 / 20.0);
}
return beta_dmrs_pusch;
common/utils/nr/nr_common.h
+5 -5
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@@ -320,15 +320,15 @@ frequency_range_t get_freq_range_from_arfcn(uint32_t arfcn);
frequency_range_t get_freq_range_from_band(uint16_t band);
/**
* @brief Calculates the scaling factor for the ratio of PUSCH EPRE to DMRS EPRE.
* @brief Calculates the scaling factor for the ratio of PUSCH/PDSCH EPRE to DMRS EPRE.
*
* @param num_cdm_groups_no_data The number of CDM groups without data.
* @param dmrs_type The DMRS type.
* @return The calculated beta scaling factor for the ratio of PUSCH EPRE to DMRS EPRE.
* @param is_type2 true if calculating for DMRS configuration type 2
* @return The calculated beta scaling factor for the ratio of PUSCH/PDSCH EPRE to DMRS EPRE.
*
* @note The values are derived from TS 38.214 Table 6.2.2-1.
* @note The values are the same for PUSCH and PDSCH and are derived from TS 38.214 Table 6.2.2-1./4.1-1
*/
float get_beta_dmrs_pusch(int num_cdm_groups_no_data, pusch_dmrs_type_t dmrs_type);
float get_beta_dmrs(int num_cdm_groups_no_data, bool is_type2);
#define CEILIDIV(a,b) ((a+b-1)/b)
#define ROUNDIDIV(a,b) (((a<<1)+b)/(b<<1))
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+1 -2
View File
@@ -499,8 +499,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
pusch_pdu->scid,
Ns,
symbol);
pusch_dmrs_type_t dmrs_type = pusch_pdu->dmrs_config_type == NFAPI_NR_DMRS_TYPE1 ? pusch_dmrs_type1 : pusch_dmrs_type2;
float beta_dmrs_pusch = get_beta_dmrs_pusch(pusch_pdu->num_dmrs_cdm_grps_no_data, dmrs_type);
float beta_dmrs_pusch = get_beta_dmrs(pusch_pdu->num_dmrs_cdm_grps_no_data, pusch_pdu->dmrs_config_type == pusch_dmrs_type2);
int16_t dmrs_scaling = (1 / beta_dmrs_pusch) * (1 << 14);
nr_pusch_dmrs_rx(gNB,
Ns,
openair1/PHY/NR_REFSIG/nr_dmrs_rx.c
+3 -1
View File
@@ -117,7 +117,8 @@ int nr_pdsch_dmrs_rx(const PHY_VARS_NR_UE *ue,
unsigned short p,
unsigned char lp,
unsigned short nb_pdsch_rb,
uint8_t config_type)
uint8_t config_type,
int16_t dmrs_scaling)
{
typedef int array_of_w[2];
const array_of_w *wf = (config_type == NFAPI_NR_DMRS_TYPE1) ? wf1 : wf2;
@@ -131,6 +132,7 @@ int nr_pdsch_dmrs_rx(const PHY_VARS_NR_UE *ue,
for (int i = 0; i < nb_pdsch_rb * ((config_type == NFAPI_NR_DMRS_TYPE1) ? 6 : 4); i++) {
int w = (wf[p - 1000][i & 1]) * (wt[p - 1000][lp]);
output[i] = get_modulated(nr_gold_pdsch, i, w == 1);
output[i] = c16mulRealShift(output[i], dmrs_scaling, 14);
#ifdef DEBUG_PDSCH
printf("nr_pdsch_dmrs_rx dmrs config type %d port %d nb_pdsch_rb %d\n", config_type, p, nb_pdsch_rb);
openair1/PHY/NR_REFSIG/refsig_defs_ue.h
+2 -1
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@@ -49,7 +49,8 @@ int nr_pdsch_dmrs_rx(const PHY_VARS_NR_UE *ue,
unsigned short p,
unsigned char lp,
unsigned short nb_pdsch_rb,
uint8_t config_type);
uint8_t config_type,
int16_t dmrs_scaling);
void sl_generate_pss(SL_NR_UE_INIT_PARAMS_t *sl_init_params, uint8_t n_sl_id2, uint16_t scaling);
void sl_generate_pss_ifft_samples(sl_nr_ue_phy_params_t *sl_ue_params, SL_NR_UE_INIT_PARAMS_t *sl_init_params);
openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
+5 -1
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@@ -19,6 +19,7 @@
* contact@openairinterface.org
*/
#include "nr_common.h"
#include <string.h>
#include "SCHED_NR_UE/defs.h"
#include "nr_estimation.h"
@@ -1258,6 +1259,7 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
unsigned short scrambling_id,
unsigned short BWPStart,
uint8_t config_type,
int n_dmrs_cdm_groups,
uint16_t rb_offset,
unsigned short bwp_start_subcarrier,
unsigned short nb_rb_pdsch,
@@ -1291,8 +1293,10 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
c16_t pilot[3280] __attribute__((aligned(16)));
// Note: pilot returned by the following function is already the complex conjugate of the transmitted DMRS
float beta_dmrs_pdsch = get_beta_dmrs(n_dmrs_cdm_groups, config_type == NFAPI_NR_DMRS_TYPE2);
int16_t dmrs_scaling = (int16_t)((1 / beta_dmrs_pdsch) * (1 << 14));
const uint32_t *gold = nr_gold_pdsch(fp->N_RB_DL, fp->symbols_per_slot, scrambling_id, nscid, slot, symbol);
nr_pdsch_dmrs_rx(ue, slot, gold, pilot, 1000 + p, 0, nb_rb_pdsch + rb_offset, config_type);
nr_pdsch_dmrs_rx(ue, slot, gold, pilot, 1000 + p, 0, nb_rb_pdsch + rb_offset, config_type, dmrs_scaling);
delay_t delay = {0};
openair1/PHY/NR_UE_ESTIMATION/nr_estimation.h
+1
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@@ -87,6 +87,7 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
unsigned short scrambling_id,
unsigned short BWPStart,
uint8_t config_type,
int n_dmrs_cdm_groups,
uint16_t rb_offset,
unsigned short bwp_start_subcarrier,
unsigned short nb_rb_pdsch,
openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
+1 -1
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@@ -396,7 +396,7 @@ static void dmrs_amp_mult(const uint32_t dmrs_port,
const pusch_dmrs_type_t dmrs_type,
const unsigned int num_cdm_groups_no_data)
{
float beta_dmrs_pusch = get_beta_dmrs_pusch(num_cdm_groups_no_data, dmrs_type);
float beta_dmrs_pusch = get_beta_dmrs(num_cdm_groups_no_data, dmrs_type == pusch_dmrs_type2);
/* short array that hold amplitude for k_prime = 0 and k_prime = 1 */
int32_t alpha_dmrs[2] __attribute((aligned(16)));
for (int_fast8_t i = 0; i < sizeofArray(alpha_dmrs); i++) {
openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
+1
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@@ -553,6 +553,7 @@ static int nr_ue_pdsch_procedures(PHY_VARS_NR_UE *ue,
dlschCfg->dlDmrsScramblingId,
dlschCfg->BWPStart,
dlschCfg->dmrsConfigType,
dlschCfg->n_dmrs_cdm_groups,
dlschCfg->rb_offset,
ue->frame_parms.first_carrier_offset + (dlschCfg->BWPStart + dlschCfg->start_rb) * 12,
dlschCfg->number_rbs,