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Fix in RI computation

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This commit is contained in:
Roberto Louro Magueta
2022-05-20 20:51:22 +01:00
parent 7018b7c841
commit 4eac17e1c8
1 changed files with 31 additions and 2 deletions
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openair1/PHY/NR_UE_TRANSPORT/csi_rx.c
+31 -2
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@@ -340,7 +340,7 @@ int nr_csi_rs_ri_estimation(PHY_VARS_NR_UE *ue,
uint8_t *rank_indicator) {
NR_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
int16_t cond_dB_threshold = 0;
int16_t cond_dB_threshold = 5;
int count = 0;
*rank_indicator = 0;
@@ -357,6 +357,8 @@ int nr_csi_rs_ri_estimation(PHY_VARS_NR_UE *ue,
* | conjch01 conjch11 | | ch10 ch11 | | conjch01*ch00+conjch11*ch10 conjch01*ch01+conjch11*ch11 |
*/
uint8_t sum_shift = 1; // log2(2x2) = 2, which is a shift of 1 bit
for(uint16_t port_tx_conjch = 0; port_tx_conjch < nr_csi_rs_info->N_ports; port_tx_conjch++) {
for(uint16_t port_tx_ch = 0; port_tx_ch < nr_csi_rs_info->N_ports; port_tx_ch++) {
memset(nr_csi_rs_info->csi_rs_estimated_A_MF[port_tx_conjch][port_tx_ch],0,NR_MAX_OFDM_SYMBOL_SIZE*sizeof(int32_t));
@@ -413,11 +415,33 @@ int nr_csi_rs_ri_estimation(PHY_VARS_NR_UE *ue,
&nr_csi_rs_info->csi_rs_estimated_numer_fin[k],
1);
#ifdef NR_CSIRS_DEBUG
for(uint16_t port_tx_conjch = 0; port_tx_conjch < nr_csi_rs_info->N_ports; port_tx_conjch++) {
for(uint16_t port_tx_ch = 0; port_tx_ch < nr_csi_rs_info->N_ports; port_tx_ch++) {
int16_t *csi_rs_estimated_A_MF = (int16_t *) &nr_csi_rs_info->csi_rs_estimated_A_MF[port_tx_conjch][port_tx_ch][k];
LOG_I(NR_PHY, "(%i) csi_rs_estimated_A_MF[%i][%i] = (%i, %i)\n",
k, port_tx_conjch, port_tx_ch, csi_rs_estimated_A_MF[0], csi_rs_estimated_A_MF[1]);
int16_t *csi_rs_estimated_A_MF_sq = (int16_t *) &nr_csi_rs_info->csi_rs_estimated_A_MF_sq[port_tx_conjch][port_tx_ch][k];
LOG_I(NR_PHY, "(%i) csi_rs_estimated_A_MF_sq[%i][%i] = (%i, %i)\n",
k, port_tx_conjch, port_tx_ch, csi_rs_estimated_A_MF_sq[0], csi_rs_estimated_A_MF_sq[1]);
}
}
LOG_I(NR_PHY, "(%i) csi_rs_estimated_determ_fin = %i\n", k, nr_csi_rs_info->csi_rs_estimated_determ_fin[k]);
LOG_I(NR_PHY, "(%i) csi_rs_estimated_numer_fin = %i\n", k, nr_csi_rs_info->csi_rs_estimated_numer_fin[k]>>sum_shift);
#endif
// compute the conditional number
for (int sc_idx=0; sc_idx < NR_NB_SC_PER_RB; sc_idx++) {
int8_t csi_rs_estimated_denum_db = dB_fixed(nr_csi_rs_info->csi_rs_estimated_determ_fin[k + sc_idx]);
int8_t csi_rs_estimated_numer_db = dB_fixed(nr_csi_rs_info->csi_rs_estimated_numer_fin[k + sc_idx]);
int8_t csi_rs_estimated_numer_db = dB_fixed(nr_csi_rs_info->csi_rs_estimated_numer_fin[k + sc_idx]>>sum_shift);
int8_t cond_db = csi_rs_estimated_numer_db - csi_rs_estimated_denum_db;
#ifdef NR_CSIRS_DEBUG
LOG_I(NR_PHY, "csi_rs_estimated_denum_db = %i\n", csi_rs_estimated_denum_db);
LOG_I(NR_PHY, "csi_rs_estimated_numer_db = %i\n", csi_rs_estimated_numer_db);
LOG_I(NR_PHY, "cond_db = %i\n", cond_db);
#endif
if (cond_db < cond_dB_threshold) {
count++;
} else {
@@ -431,6 +455,11 @@ int nr_csi_rs_ri_estimation(PHY_VARS_NR_UE *ue,
*rank_indicator = 1;
}
#ifdef NR_CSIRS_DEBUG
LOG_I(NR_PHY, "count = %i\n", count);
LOG_I(NR_PHY, "rank = %i\n", (*rank_indicator)+1);
#endif
return 0;
}