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LS channel estimation at UE based on CSI-RS

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This commit is contained in:
rmagueta
2022-03-09 15:07:23 +00:00
parent db0ce84aa5
commit 51a72b8479
4 changed files with 81 additions and 2 deletions
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openair1/PHY/INIT/nr_init_ue.c
+25
View File
@@ -364,11 +364,16 @@ int init_nr_ue_signal(PHY_VARS_NR_UE *ue, int nb_connected_gNB)
AssertFatal(ue->nr_csi_rs_info->nr_gold_csi_rs[slot][symb]!=NULL, "NR init: csi reference signal for slot %d symbol %d - malloc failed\n", slot, symb);
}
}
ue->nr_csi_rs_info->noise_power = (uint32_t*)malloc16_clear(sizeof(uint32_t));
ue->nr_csi_rs_info->csi_rs_generated_signal = (int32_t **)malloc16(fp->nb_antennas_rx * sizeof(int32_t *) );
ue->nr_csi_rs_info->csi_rs_received_signal = (int32_t **)malloc16(fp->nb_antennas_rx * sizeof(int32_t *) );
ue->nr_csi_rs_info->csi_rs_ls_estimated_channel = (int32_t **)malloc16(fp->nb_antennas_rx * sizeof(int32_t *) );
ue->nr_csi_rs_info->csi_rs_estimated_channel_freq = (int32_t **)malloc16(fp->nb_antennas_rx * sizeof(int32_t *) );
for (i=0; i<fp->nb_antennas_rx; i++) {
ue->nr_csi_rs_info->csi_rs_generated_signal[i] = (int32_t *) malloc16_clear(fp->samples_per_frame_wCP * sizeof(int32_t));
ue->nr_csi_rs_info->csi_rs_received_signal[i] = (int32_t *) malloc16_clear(fp->samples_per_frame_wCP * sizeof(int32_t));
ue->nr_csi_rs_info->csi_rs_ls_estimated_channel[i] = (int32_t *) malloc16_clear(fp->samples_per_frame_wCP * sizeof(int32_t));
ue->nr_csi_rs_info->csi_rs_estimated_channel_freq[i] = (int32_t *) malloc16_clear(fp->samples_per_frame_wCP * sizeof(int32_t));
}
ue->nr_srs_info = (nr_srs_info_t *)malloc16_clear(sizeof(nr_srs_info_t));
@@ -647,6 +652,26 @@ void term_nr_ue_signal(PHY_VARS_NR_UE *ue, int nb_connected_gNB)
free_and_zero(ue->pdcch_vars[th_id][gNB_id]);
}
for (int i = 0; i < fp->nb_antennas_rx; i++) {
free_and_zero(ue->nr_csi_rs_info->csi_rs_generated_signal[i]);
free_and_zero(ue->nr_csi_rs_info->csi_rs_received_signal[i]);
free_and_zero(ue->nr_csi_rs_info->csi_rs_ls_estimated_channel[i]);
free_and_zero(ue->nr_csi_rs_info->csi_rs_estimated_channel_freq[i]);
}
for (int slot=0; slot<fp->slots_per_frame; slot++) {
for (int symb=0; symb<fp->symbols_per_slot; symb++) {
free_and_zero(ue->nr_csi_rs_info->nr_gold_csi_rs[slot][symb]);
}
free_and_zero(ue->nr_csi_rs_info->nr_gold_csi_rs[slot]);
}
free_and_zero(ue->nr_csi_rs_info->noise_power);
free_and_zero(ue->nr_csi_rs_info->nr_gold_csi_rs);
free_and_zero(ue->nr_csi_rs_info->csi_rs_generated_signal);
free_and_zero(ue->nr_csi_rs_info->csi_rs_received_signal);
free_and_zero(ue->nr_csi_rs_info->csi_rs_ls_estimated_channel);
free_and_zero(ue->nr_csi_rs_info->csi_rs_estimated_channel_freq);
free_and_zero(ue->nr_csi_rs_info);
for (int i = 0; i < fp->nb_antennas_rx; i++) {
free_and_zero(ue->nr_srs_info->srs_received_signal[i]);
free_and_zero(ue->nr_srs_info->srs_ls_estimated_channel[i]);
openair1/PHY/NR_TRANSPORT/nr_csi_rs.c
+2 -1
View File
@@ -79,6 +79,7 @@ void nr_generate_csi_rs(NR_DL_FRAME_PARMS frame_parms,
uint8_t fi = 0;
double rho, alpha;
uint32_t beta = amp;
nr_csi_rs_info->csi_rs_generated_signal_bits = log2_approx(amp);
AssertFatal(b!=0, "Invalid CSI frequency domain mapping: no bit selected in bitmap\n");
@@ -639,7 +640,7 @@ void nr_generate_csi_rs(NR_DL_FRAME_PARMS frame_parms,
((int16_t*)dataF[p])[((l*frame_parms.ofdm_symbol_size + k)<<1)+1+(2*dataF_offset)] = (beta*wt*wf*mod_csi[l][(mprime<<1) + 1]) >> 15;
}
#ifdef NR_CSIRS_DEBUG
printf("l,k (%d %d) seq. index %d \t port %d \t (%d,%d)\n",l,k,mprime,p+3000,
printf("l,k (%d,%d) seq. index %d \t port %d \t (%d,%d)\n",l,k,mprime,p+3000,
((int16_t*)dataF[p])[((l*frame_parms.ofdm_symbol_size + k)<<1)+(2*dataF_offset)],
((int16_t*)dataF[p])[((l*frame_parms.ofdm_symbol_size + k)<<1)+1+(2*dataF_offset)]);
#endif
openair1/PHY/NR_UE_TRANSPORT/csi_rx.c
+50 -1
View File
@@ -63,7 +63,7 @@ int nr_get_csi_rs_signal(PHY_VARS_NR_UE *ue,
#ifdef NR_CSIRS_DEBUG
int dataF_offset = proc->nr_slot_rx*ue->frame_parms.samples_per_slot_wCP;
int16_t *tx_csi_rs_signal = (int16_t*)&nr_csi_rs_info->csi_rs_generated_signal[ant][symbol_offset+dataF_offset];
LOG_I(NR_PHY, "l,k (%d %d) \t tx (%d,%d) \t rx (%d,%d)\n",
LOG_I(NR_PHY, "l,k (%2d,%3d) |\ttx (%4d,%4d)\trx (%4d,%4d)\n",
symb,
nr_csi_rs_info->map_list[symb][k_id],
tx_csi_rs_signal[k<<1],
@@ -78,6 +78,48 @@ int nr_get_csi_rs_signal(PHY_VARS_NR_UE *ue,
return 0;
}
int nr_csi_rs_channel_estimation(PHY_VARS_NR_UE *ue,
UE_nr_rxtx_proc_t *proc,
nr_csi_rs_info_t *nr_csi_rs_info,
int32_t **csi_rs_generated_signal,
int32_t **csi_rs_received_signal,
int32_t **csi_rs_estimated_channel_freq,
uint32_t *noise_power) {
NR_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
int dataF_offset = proc->nr_slot_rx*ue->frame_parms.samples_per_slot_wCP;
int16_t ls_estimated[2];
for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++) {
for(int symb = 0; symb < NR_SYMBOLS_PER_SLOT; symb++) {
uint64_t symbol_offset = symb*frame_parms->ofdm_symbol_size;
int16_t *tx_csi_rs_signal = (int16_t*)&nr_csi_rs_info->csi_rs_generated_signal[ant][symbol_offset+dataF_offset];
int16_t *rx_csi_rs_signal = (int16_t*)&csi_rs_received_signal[ant][symbol_offset];
for(int k_id = 0; k_id<nr_csi_rs_info->k_list_length[symb]; k_id++) {
uint16_t k = nr_csi_rs_info->map_list[symb][k_id];
ls_estimated[0] = (int16_t)(((int32_t)tx_csi_rs_signal[k<<1]*rx_csi_rs_signal[k<<1] + (int32_t)tx_csi_rs_signal[(k<<1)+1]*rx_csi_rs_signal[(k<<1)+1])>>nr_csi_rs_info->csi_rs_generated_signal_bits);
ls_estimated[1] = (int16_t)(((int32_t)tx_csi_rs_signal[k<<1]*rx_csi_rs_signal[(k<<1)+1] - (int32_t)tx_csi_rs_signal[(k<<1)+1]*rx_csi_rs_signal[k<<1])>>nr_csi_rs_info->csi_rs_generated_signal_bits);
#ifdef NR_CSIRS_DEBUG
LOG_I(NR_PHY, "l,k (%2d,%3d) |\ttx (%4d,%4d)\trx (%4d,%4d)\tls (%4d,%4d)\n",
symb,
nr_csi_rs_info->map_list[symb][k_id],
tx_csi_rs_signal[k<<1],
tx_csi_rs_signal[(k<<1)+1],
rx_csi_rs_signal[k<<1],
rx_csi_rs_signal[(k<<1)+1],
ls_estimated[0],
ls_estimated[1]);
#endif
}
}
}
return 0;
}
int nr_ue_csi_im_procedures(PHY_VARS_NR_UE *ue, UE_nr_rxtx_proc_t *proc, uint8_t gNB_id) {
return 0;
}
@@ -117,5 +159,12 @@ int nr_ue_csi_rs_procedures(PHY_VARS_NR_UE *ue, UE_nr_rxtx_proc_t *proc, uint8_t
nr_get_csi_rs_signal(ue, proc, ue->nr_csi_rs_info, ue->nr_csi_rs_info->csi_rs_received_signal);
nr_csi_rs_channel_estimation(ue,
proc,
ue->nr_csi_rs_info,
ue->nr_csi_rs_info->csi_rs_generated_signal,
ue->nr_csi_rs_info->csi_rs_received_signal,
ue->nr_csi_rs_info->csi_rs_estimated_channel_freq,
ue->nr_csi_rs_info->noise_power);
return 0;
}
openair1/PHY/defs_nr_common.h
+4
View File
@@ -268,8 +268,12 @@ typedef struct {
uint32_t ***nr_gold_csi_rs;
uint16_t k_list_length[NR_SYMBOLS_PER_SLOT];
uint16_t map_list[NR_SYMBOLS_PER_SLOT][NR_MAX_CSI_RS_LENGTH];
uint8_t csi_rs_generated_signal_bits;
int32_t **csi_rs_generated_signal;
int32_t **csi_rs_received_signal;
int32_t **csi_rs_ls_estimated_channel;
int32_t **csi_rs_estimated_channel_freq;
uint32_t *noise_power;
} nr_csi_rs_info_t;
typedef struct NR_DL_FRAME_PARMS NR_DL_FRAME_PARMS;