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openairinterface5g/openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.0 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include <string.h>
#include "SCHED_NR_UE/defs.h"
#include "nr_estimation.h"
#include "PHY/NR_REFSIG/refsig_defs_ue.h"
#include "PHY/NR_REFSIG/nr_refsig.h"
#include "PHY/NR_REFSIG/dmrs_nr.h"
#include "PHY/NR_REFSIG/ptrs_nr.h"
#include "PHY/NR_TRANSPORT/nr_sch_dmrs.h"
#include "filt16a_32.h"
#include <openair1/PHY/TOOLS/phy_scope_interface.h>
//#define DEBUG_PDSCH
//#define DEBUG_PDCCH
int nr_pbch_dmrs_correlation(PHY_VARS_NR_UE *ue,
UE_nr_rxtx_proc_t *proc,
uint8_t gNB_id,
unsigned char Ns,
unsigned char symbol,
int dmrss,
NR_UE_SSB *current_ssb)
{
int pilot[200] __attribute__((aligned(16)));
unsigned short k;
unsigned int pilot_cnt;
int16_t ch[2],*pil,*rxF;
int symbol_offset;
uint8_t nushift;
uint8_t ssb_index=current_ssb->i_ssb;
uint8_t n_hf=current_ssb->n_hf;
int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[proc->thread_id].rxdataF;
nushift = ue->frame_parms.Nid_cell%4;
ue->frame_parms.nushift = nushift;
unsigned int ssb_offset = ue->frame_parms.first_carrier_offset + ue->frame_parms.ssb_start_subcarrier;
if (ssb_offset>= ue->frame_parms.ofdm_symbol_size) ssb_offset-=ue->frame_parms.ofdm_symbol_size;
AssertFatal(dmrss >= 0 && dmrss < 3,
"symbol %d is illegal for PBCH DM-RS \n",
dmrss);
symbol_offset = ue->frame_parms.ofdm_symbol_size*symbol;
k = nushift;
#ifdef DEBUG_CH
printf("PBCH DMRS Correlation : ThreadId %d, gNB_id %d , OFDM size %d, Ncp=%d, Ns=%d, k=%d symbol %d\n",proc->thread_id, gNB_id,ue->frame_parms.ofdm_symbol_size,
ue->frame_parms.Ncp,Ns,k, symbol);
#endif
// generate pilot
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++) {
int re_offset = ssb_offset;
pil = (int16_t *)&pilot[0];
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
#ifdef DEBUG_CH
printf("pbch ch est pilot addr %p RB_DL %d\n",&pilot[0], ue->frame_parms.N_RB_DL);
printf("k %d, first_carrier %d\n",k,ue->frame_parms.first_carrier_offset);
printf("rxF addr %p\n", rxF);
#endif
//if ((ue->frame_parms.N_RB_DL&1)==0) {
// Treat first 2 pilots specially (left edge)
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("pilot 1 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("pilot 2 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
for (pilot_cnt=3; pilot_cnt<(3*20); pilot_cnt += 3) {
// if (pilot_cnt == 30)
// rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k)];
// in 2nd symbol, skip middle REs (48 with DMRS, 144 for SSS, and another 48 with DMRS)
if (dmrss == 1 && pilot_cnt == 12) {
pilot_cnt=48;
re_offset = (re_offset+144) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
current_ssb->c_re += ch[0];
current_ssb->c_im += ch[1];
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+2,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
}
//}
}
return(0);
}
int nr_pbch_channel_estimation(PHY_VARS_NR_UE *ue,
int estimateSz,
struct complex16 dl_ch_estimates [][estimateSz],
struct complex16 dl_ch_estimates_time [][ue->frame_parms.ofdm_symbol_size],
UE_nr_rxtx_proc_t *proc,
uint8_t gNB_id,
unsigned char Ns,
unsigned char symbol,
int dmrss,
uint8_t ssb_index,
uint8_t n_hf)
{
int pilot[200] __attribute__((aligned(16)));
unsigned short k;
unsigned int pilot_cnt;
int16_t *pil,*rxF,*dl_ch,*fl,*fm,*fr;
int ch_offset,symbol_offset;
//int slot_pbch;
uint8_t nushift;
int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[proc->thread_id].rxdataF;
nushift = ue->frame_parms.Nid_cell%4;
ue->frame_parms.nushift = nushift;
unsigned int ssb_offset = ue->frame_parms.first_carrier_offset + ue->frame_parms.ssb_start_subcarrier;
if (ssb_offset>= ue->frame_parms.ofdm_symbol_size) ssb_offset-=ue->frame_parms.ofdm_symbol_size;
ch_offset = ue->frame_parms.ofdm_symbol_size*symbol;
AssertFatal(dmrss >= 0 && dmrss < 3,
"symbol %d is illegal for PBCH DM-RS \n",
dmrss);
symbol_offset = ue->frame_parms.ofdm_symbol_size*symbol;
k = nushift;
#ifdef DEBUG_CH
printf("PBCH Channel Estimation : ThreadId %d, gNB_id %d ch_offset %d, OFDM size %d, Ncp=%d, Ns=%d, k=%d symbol %d\n",proc->thread_id, gNB_id,ch_offset,ue->frame_parms.ofdm_symbol_size,
ue->frame_parms.Ncp,Ns,k, symbol);
#endif
switch (k) {
case 0:
fl = filt16a_l0;
fm = filt16a_m0;
fr = filt16a_r0;
break;
case 1:
fl = filt16a_l1;
fm = filt16a_m1;
fr = filt16a_r1;
break;
case 2:
fl = filt16a_l2;
fm = filt16a_m2;
fr = filt16a_r2;
break;
case 3:
fl = filt16a_l3;
fm = filt16a_m3;
fr = filt16a_r3;
break;
default:
msg("pbch_channel_estimation: k=%d -> ERROR\n",k);
return(-1);
break;
}
idft_size_idx_t idftsizeidx;
switch (ue->frame_parms.ofdm_symbol_size) {
case 128:
idftsizeidx = IDFT_128;
break;
case 256:
idftsizeidx = IDFT_256;
break;
case 512:
idftsizeidx = IDFT_512;
break;
case 1024:
idftsizeidx = IDFT_1024;
break;
case 1536:
idftsizeidx = IDFT_1536;
break;
case 2048:
idftsizeidx = IDFT_2048;
break;
case 3072:
idftsizeidx = IDFT_3072;
break;
case 4096:
idftsizeidx = IDFT_4096;
break;
default:
printf("unsupported ofdm symbol size \n");
assert(0);
}
// generate pilot
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++) {
int re_offset = ssb_offset;
pil = (int16_t *)&pilot[0];
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
dl_ch = (int16_t *)&dl_ch_estimates[aarx][ch_offset];
memset(dl_ch,0,sizeof(struct complex16)*(ue->frame_parms.ofdm_symbol_size));
#ifdef DEBUG_CH
printf("pbch ch est pilot addr %p RB_DL %d\n",&pilot[0], ue->frame_parms.N_RB_DL);
printf("k %d, first_carrier %d\n",k,ue->frame_parms.first_carrier_offset);
printf("rxF addr %p\n", rxF);
printf("dl_ch addr %p\n",dl_ch);
#endif
// Treat first 2 pilots specially (left edge)
int16_t ch[2];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
16);
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
//for (int i= 0; i<8; i++)
//printf("dl_ch addr %p %d\n", dl_ch+i, *(dl_ch+i));
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("pilot 1 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
16);
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("pilot 2 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
16);
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
dl_ch += 24;
for (pilot_cnt=3; pilot_cnt<(3*20); pilot_cnt += 3) {
// if (pilot_cnt == 30)
// rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k)];
// in 2nd symbol, skip middle REs (48 with DMRS, 144 for SSS, and another 48 with DMRS)
if (dmrss == 1 && pilot_cnt == 12) {
pilot_cnt=48;
re_offset = (re_offset+144) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
dl_ch += 288;
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
16);
//for (int i= 0; i<8; i++)
// printf("pilot_cnt %d dl_ch %d %d\n", pilot_cnt, dl_ch+i, *(dl_ch+i));
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
16);
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_CH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+2,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
16);
pil += 2;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+re_offset)];
dl_ch += 24;
}
if( dmrss == 2) // update time statistics for last PBCH symbol
{
// do ifft of channel estimate
LOG_D(PHY,"Channel Impulse Computation Slot %d Symbol %d ch_offset %d\n", Ns, symbol, ch_offset);
idft(idftsizeidx,
(int16_t*) &dl_ch_estimates[aarx][ch_offset],
(int16_t*) dl_ch_estimates_time[aarx],
1);
}
}
if (dmrss == 2)
UEscopeCopy(ue, pbchDlChEstimateTime, (void*)dl_ch_estimates_time, sizeof(struct complex16), ue->frame_parms.nb_antennas_rx, idftsizeidx);
return(0);
}
int nr_pdcch_channel_estimation(PHY_VARS_NR_UE *ue,
UE_nr_rxtx_proc_t *proc,
uint8_t gNB_id,
unsigned char Ns,
unsigned char symbol,
unsigned short scrambling_id,
unsigned short coreset_start_subcarrier,
unsigned short nb_rb_coreset,
int32_t pdcch_est_size,
int32_t pdcch_dl_ch_estimates[][pdcch_est_size])
{
unsigned char aarx;
unsigned short k;
unsigned int pilot_cnt;
int16_t ch[2],*pil,*rxF,*dl_ch,*fl,*fm,*fr;
int ch_offset,symbol_offset;
int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[proc->thread_id].rxdataF;
ch_offset = ue->frame_parms.ofdm_symbol_size*symbol;
symbol_offset = ue->frame_parms.ofdm_symbol_size*symbol;
#ifdef DEBUG_PDCCH
printf("PDCCH Channel Estimation : ThreadId %d, gNB_id %d ch_offset %d, OFDM size %d, Ncp=%d, Ns=%d, symbol %d\n",
proc->thread_id, gNB_id,ch_offset,ue->frame_parms.ofdm_symbol_size,ue->frame_parms.Ncp,Ns,symbol);
#endif
fl = filt16a_l1;
fm = filt16a_m1;
fr = filt16a_r1;
// checking if re-initialization of scrambling IDs is needed (should be done here but scrambling ID for PDCCH is not taken from RRC)
if (scrambling_id != ue->scramblingID_pdcch){
ue->scramblingID_pdcch = scrambling_id;
nr_gold_pdcch(ue,ue->scramblingID_pdcch);
}
// generate pilot
int pilot[nb_rb_coreset * 3] __attribute__((aligned(16)));
nr_pdcch_dmrs_rx(ue,gNB_id,Ns,ue->nr_gold_pdcch[gNB_id][Ns][symbol], &pilot[0],2000,nb_rb_coreset);
for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
k = coreset_start_subcarrier;
pil = (int16_t *)&pilot[0];
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
dl_ch = (int16_t *)&pdcch_dl_ch_estimates[aarx][ch_offset];
memset(dl_ch,0,4*(ue->frame_parms.ofdm_symbol_size));
#ifdef DEBUG_PDCCH
printf("pdcch ch est pilot addr %p RB_DL %d\n",&pilot[0], ue->frame_parms.N_RB_DL);
printf("k %d, first_carrier %d\n",k,ue->frame_parms.first_carrier_offset);
printf("rxF addr %p\n", rxF);
printf("dl_ch addr %p\n",dl_ch);
#endif
// if ((ue->frame_parms.N_RB_DL&1)==0) {
// Treat first 2 pilots specially (left edge)
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
16);
pil += 2;
rxF += 8;
k += 4;
if (k >= ue->frame_parms.ofdm_symbol_size) {
k -= ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("pilot 1 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
16);
pil += 2;
rxF += 8;
k += 4;
if (k >= ue->frame_parms.ofdm_symbol_size) {
k -= ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("pilot 2 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
16);
#ifdef DEBUG_PDCCH
for (int m =0; m<12; m++)
printf("data : dl_ch -> (%d,%d)\n",dl_ch[0+2*m],dl_ch[1+2*m]);
#endif
dl_ch += 24;
pil += 2;
rxF += 8;
k += 4;
for (pilot_cnt=3; pilot_cnt<(3*nb_rb_coreset); pilot_cnt += 3) {
if (k >= ue->frame_parms.ofdm_symbol_size) {
k -= ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
16);
//for (int i= 0; i<8; i++)
// printf("pilot_cnt %d dl_ch %d %d\n", pilot_cnt, dl_ch+i, *(dl_ch+i));
pil += 2;
rxF += 8;
k += 4;
if (k >= ue->frame_parms.ofdm_symbol_size) {
k -= ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
16);
pil += 2;
rxF += 8;
k += 4;
if (k >= ue->frame_parms.ofdm_symbol_size) {
k -= ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+k+1)];
}
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDCCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+2,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
16);
#ifdef DEBUG_PDCCH
for (int m =0; m<12; m++)
printf("data : dl_ch -> (%d,%d)\n",dl_ch[0+2*m],dl_ch[1+2*m]);
#endif
dl_ch += 24;
pil += 2;
rxF += 8;
k += 4;
}
//}
}
return(0);
}
int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
UE_nr_rxtx_proc_t *proc,
uint8_t gNB_id,
bool is_SI,
unsigned char Ns,
unsigned short p,
unsigned char symbol,
unsigned char nscid,
unsigned short scrambling_id,
unsigned short BWPStart,
uint8_t config_type,
unsigned short bwp_start_subcarrier,
unsigned short nb_rb_pdsch)
{
int pilot[3280] __attribute__((aligned(16)));
unsigned char aarx;
unsigned short k;
unsigned int pilot_cnt;
int16_t ch_l[2],ch_r[2],ch[2],*pil,*rxF,*dl_ch;
int16_t *fl=NULL,*fm=NULL,*fr=NULL,*fml=NULL,*fmr=NULL,*fmm=NULL,*fdcl=NULL,*fdcr=NULL,*fdclh=NULL,*fdcrh=NULL, *frl=NULL, *frr=NULL;
int ch_offset,symbol_offset;
uint8_t nushift;
int **dl_ch_estimates =ue->pdsch_vars[proc->thread_id][gNB_id]->dl_ch_estimates;
int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[proc->thread_id].rxdataF;
ch_offset = ue->frame_parms.ofdm_symbol_size*symbol;
symbol_offset = ue->frame_parms.ofdm_symbol_size*symbol;
k = bwp_start_subcarrier;
int re_offset = k;
#ifdef DEBUG_CH
printf("PDSCH Channel Estimation : ThreadId %d, gNB_id %d ch_offset %d, symbol_offset %d OFDM size %d, Ncp=%d, Ns=%d, k=%d symbol %d\n",proc->thread_id, gNB_id,ch_offset,symbol_offset,ue->frame_parms.ofdm_symbol_size,
ue->frame_parms.Ncp,Ns,k, symbol);
#endif
// generate pilot for gNB port number 1000+p
uint16_t rb_offset = (bwp_start_subcarrier - ue->frame_parms.first_carrier_offset) / 12;
if (is_SI) {
rb_offset -= BWPStart;
}
int8_t delta = get_delta(p, config_type);
// checking if re-initialization of scrambling IDs is needed
if (scrambling_id != ue->scramblingID_dlsch[nscid]){
ue->scramblingID_dlsch[nscid] = scrambling_id;
nr_gold_pdsch(ue, nscid, scrambling_id);
}
nr_pdsch_dmrs_rx(ue, Ns, ue->nr_gold_pdsch[gNB_id][Ns][symbol][0], &pilot[0], 1000+p, 0, nb_rb_pdsch+rb_offset, config_type);
if (config_type == NFAPI_NR_DMRS_TYPE1){
nushift = (p>>1)&1;
if (p<4) ue->frame_parms.nushift = nushift;
switch (delta) {
case 0://port 0,1
fl = filt8_l0;//left interpolation Filter for DMRS config. 1
fm = filt8_m0;//left middle interpolation Filter
fr = filt8_r0;//right interpolation Filter
fmm = filt8_mm0;;//middle middle interpolation Filter
fml = filt8_m0;//left middle interpolation Filter
fmr = filt8_mr0;//middle right interpolation Filter
fdcl = filt8_dcl0;//left DC interpolation Filter (even RB)
fdcr = filt8_dcr0;//right DC interpolation Filter (even RB)
fdclh = filt8_dcl0_h;//left DC interpolation Filter (odd RB)
fdcrh = filt8_dcr0_h;//right DC interpolation Filter (odd RB)
frl = NULL;
frr = NULL;
break;
case 1://port2,3
fl = filt8_l1;
fm = filt8_m1;
fr = filt8_r1;
fmm = filt8_mm1;
fml = filt8_ml1;
fmr = filt8_m1;
fdcl = filt8_dcl1;
fdcr = filt8_dcr1;
fdclh = filt8_dcl1_h;
fdcrh = filt8_dcr1_h;
frl = NULL;
frr = NULL;
break;
default:
LOG_E(PHY,"pdsch_channel_estimation: nushift=%d -> ERROR\n",nushift);
return -1;
break;
}
} else {//NFAPI_NR_DMRS_TYPE2
nushift = delta;
if (p<6) ue->frame_parms.nushift = nushift;
switch (delta) {
case 0://port 0,1
fl = filt8_l2;//left interpolation Filter should be fml
fr = filt8_r2;//right interpolation Filter should be fmr
fm = filt8_l2;
fmm = filt8_r2;
fml = filt8_ml2;
fmr = filt8_mr2;
frl = filt8_rl2;
frr = filt8_rm2;
fdcl = filt8_dcl1;
fdcr = filt8_dcr1;
fdclh = filt8_dcl1_h;
fdcrh = filt8_dcr1_h;
break;
case 2://port2,3
fl = filt8_l3;
fm = filt8_m2;
fr = filt8_r3;
fmm = filt8_mm2;
fml = filt8_l2;
fmr = filt8_r2;
frl = filt8_rl3;
frr = filt8_rr3;
fdcl = NULL;
fdcr = NULL;
fdclh = NULL;
fdcrh = NULL;
break;
default:
LOG_E(PHY,"pdsch_channel_estimation: nushift=%d -> ERROR\n",nushift);
return -1;
break;
}
}
for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
pil = (int16_t *)&pilot[rb_offset*((config_type == NFAPI_NR_DMRS_TYPE1) ? 6:4)];
k = k % ue->frame_parms.ofdm_symbol_size;
re_offset = k;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+re_offset+nushift)];
dl_ch = (int16_t *)&dl_ch_estimates[p*ue->frame_parms.nb_antennas_rx+aarx][ch_offset];
memset(dl_ch,0,4*(ue->frame_parms.ofdm_symbol_size));
#ifdef DEBUG_PDSCH
printf("ch est pilot addr %p RB_DL %d\n",&pilot[0], ue->frame_parms.N_RB_DL);
printf("k %d, first_carrier %d\n",k,ue->frame_parms.first_carrier_offset);
printf("rxF addr %p p %d\n", rxF,p);
printf("dl_ch addr %p nushift %d\n",dl_ch,nushift);
#endif
if (config_type == NFAPI_NR_DMRS_TYPE1 && ue->prb_interpolation == 0) {
// Treat first 2 pilots specially (left edge)
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
printf("data 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[2],rxF[3],&rxF[2],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
//for (int i= 0; i<8; i++)
//printf("dl_ch addr %p %d\n", dl_ch+i, *(dl_ch+i));
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot 1 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fml,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
//printf("dl_ch addr %p\n",dl_ch);
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot 2 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fmm,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
dl_ch += 8;
for (pilot_cnt=3; pilot_cnt<(6*nb_rb_pdsch-3); pilot_cnt += 2) {
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fmm,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
dl_ch += 8;
}
// Treat first 2 pilots specially (right edge)
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
8);
//for (int i= 0; i<8; i++)
//printf("dl_ch addr %p %d\n", dl_ch+i, *(dl_ch+i));
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot %u: rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fmr,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
dl_ch += 8;
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u: rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+2,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
8);
// check if PRB crosses DC and improve estimates around DC
if ((bwp_start_subcarrier < ue->frame_parms.ofdm_symbol_size) && (bwp_start_subcarrier+nb_rb_pdsch*12 >= ue->frame_parms.ofdm_symbol_size)) {
dl_ch = (int16_t *)&dl_ch_estimates[aarx][ch_offset];
uint16_t idxDC = 2*(ue->frame_parms.ofdm_symbol_size - bwp_start_subcarrier);
uint16_t idxPil = idxDC/2;
re_offset = k;
pil = (int16_t *)&pilot[rb_offset*((config_type == NFAPI_NR_DMRS_TYPE1) ? 6:4)];
pil += (idxPil-2);
dl_ch += (idxDC-4);
dl_ch = memset(dl_ch, 0, sizeof(int16_t)*10);
re_offset = (re_offset+idxDC/2-2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
// for proper allignment of SIMD vectors
if((ue->frame_parms.N_RB_DL&1) == 0) {
multadd_real_vector_complex_scalar(fdcl,
ch,
dl_ch-4,
8);
pil += 4;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
multadd_real_vector_complex_scalar(fdcr,
ch,
dl_ch-4,
8);
} else {
multadd_real_vector_complex_scalar(fdclh,
ch,
dl_ch,
8);
pil += 4;
re_offset = (re_offset+4) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
multadd_real_vector_complex_scalar(fdcrh,
ch,
dl_ch,
8);
}
}
} else if (config_type == NFAPI_NR_DMRS_TYPE2 && ue->prb_interpolation == 0){ //pdsch_dmrs_type2 |dmrs_r,dmrs_l,0,0,0,0,dmrs_r,dmrs_l,0,0,0,0|
// Treat first 4 pilots specially (left edge)
ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("ch 0 %d\n",((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1]));
printf("pilot 0 : rxF - > (%d,%d) addr %p ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch_l[0],ch_l[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_r[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_r[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
ch[0] = (ch_l[0]+ch_r[0])>>1;
ch[1] = (ch_l[1]+ch_r[1])>>1;
dl_ch[(0+2*nushift)] = ch[0];
dl_ch[(1+2*nushift)] = ch[1];
dl_ch[2+2*nushift] = ch[0];
dl_ch[3+2*nushift] = ch[1];
multadd_real_vector_complex_scalar(fl,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_r[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_r[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
ch[0] = (ch_l[0]+ch_r[0])>>1;
ch[1] = (ch_l[1]+ch_r[1])>>1;
multadd_real_vector_complex_scalar(fr,
ch,
dl_ch,
8);
dl_ch += 12;
dl_ch[0+2*nushift] = ch[0];
dl_ch[1+2*nushift] = ch[1];
dl_ch[2+2*nushift] = ch[0];
dl_ch[3+2*nushift] = ch[1];
dl_ch += 4;
for (pilot_cnt=4; pilot_cnt<4*nb_rb_pdsch; pilot_cnt += 4) {
multadd_real_vector_complex_scalar(fml,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch_l[0],ch_l[1],pil[0],pil[1]);
#endif
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_r[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_r[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
ch[0] = (ch_l[0]+ch_r[0])>>1;
ch[1] = (ch_l[1]+ch_r[1])>>1;
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch_r[0],ch_r[1],pil[0],pil[1]);
#endif
multadd_real_vector_complex_scalar(fmr,
ch,
dl_ch,
8);
dl_ch += 8;
dl_ch[0+2*nushift] = ch[0];
dl_ch[1+2*nushift] = ch[1];
dl_ch[2+2*nushift] = ch[0];
dl_ch[3+2*nushift] = ch[1];
multadd_real_vector_complex_scalar(fm,
ch,
dl_ch,
8);
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_r[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
ch_r[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
#ifdef DEBUG_PDSCH
printf("pilot %u : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch_r[0],ch_r[1],pil[0],pil[1]);
#endif
ch[0] = (ch_l[0]+ch_r[0])>>1;
ch[1] = (ch_l[1]+ch_r[1])>>1;
multadd_real_vector_complex_scalar(fmm,
ch,
dl_ch,
8);
dl_ch += 12;
dl_ch[0+2*nushift] = ch[0];
dl_ch[1+2*nushift] = ch[1];
dl_ch[2+2*nushift] = ch[0];
dl_ch[3+2*nushift] = ch[1];
dl_ch += 4;
}
// Treat last 2 pilots specially (right edge)
// dl_ch-2+nushift<<1
multadd_real_vector_complex_scalar(frl,
dl_ch-2+2*nushift,
dl_ch,
8);
multadd_real_vector_complex_scalar(frr,
dl_ch-14+2*nushift,/*14*/
dl_ch,
8);
// check if PRB crosses DC and improve estimates around DC
if ((bwp_start_subcarrier < ue->frame_parms.ofdm_symbol_size) && (bwp_start_subcarrier+nb_rb_pdsch*12 >= ue->frame_parms.ofdm_symbol_size) && (p<2)) {
dl_ch = (int16_t *)&dl_ch_estimates[p*ue->frame_parms.nb_antennas_rx+aarx][ch_offset];
uint16_t idxDC = 2*(ue->frame_parms.ofdm_symbol_size - bwp_start_subcarrier);
dl_ch += (idxDC-8);
dl_ch = memset(dl_ch, 0, sizeof(int16_t)*20);
dl_ch -= 2;
ch_r[0] = dl_ch[0];
ch_r[1]= dl_ch[1] ;
dl_ch += 22;
ch_l[0] = dl_ch[0];
ch_l[1]= dl_ch[1] ;
// for proper allignment of SIMD vectors
if((ue->frame_parms.N_RB_DL&1) == 0) {
dl_ch -= 20;
//Interpolate fdcrl1 with ch_r
multadd_real_vector_complex_scalar(filt8_dcrl1,
ch_r,
dl_ch,
8);
//Interpolate fdclh1 with ch_l
multadd_real_vector_complex_scalar(filt8_dclh1,
ch_l,
dl_ch,
8);
dl_ch += 16;
//Interpolate fdcrh1 with ch_r
multadd_real_vector_complex_scalar(filt8_dcrh1,
ch_r,
dl_ch,
8);
//Interpolate fdcll1 with ch_l
multadd_real_vector_complex_scalar(filt8_dcll1,
ch_l,
dl_ch,
8);
} else {
dl_ch -= 28;
//Interpolate fdcrl1 with ch_r
multadd_real_vector_complex_scalar(filt8_dcrl2,
ch_r,
dl_ch,
8);
//Interpolate fdclh1 with ch_l
multadd_real_vector_complex_scalar(filt8_dclh2,
ch_l,
dl_ch,
8);
dl_ch += 16;
//Interpolate fdcrh1 with ch_r
multadd_real_vector_complex_scalar(filt8_dcrh2,
ch_r,
dl_ch,
8);
//Interpolate fdcll1 with ch_l
multadd_real_vector_complex_scalar(filt8_dcll2,
ch_l,
dl_ch,
8);
}
}
}
else if (config_type == NFAPI_NR_DMRS_TYPE1) { // this is case without frequency-domain linear interpolation, just take average of LS channel estimates of 6 DMRS REs and use a common value for the whole PRB
int32_t ch_0, ch_1;
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 6;
ch[1] = ch_1 / 6;
multadd_real_vector_complex_scalar(filt8_avlip0,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip1,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip2,
ch,
dl_ch,
8);
dl_ch -= 24;
for (pilot_cnt=6; pilot_cnt<6*(nb_rb_pdsch-1); pilot_cnt += 6) {
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 6;
ch[1] = ch_1 / 6;
dl_ch[6] += (ch[0] * 1365)>>15; // 1/12*16384
dl_ch[7] += (ch[1] * 1365)>>15; // 1/12*16384
dl_ch += 8;
multadd_real_vector_complex_scalar(filt8_avlip3,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip4,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip5,
ch,
dl_ch,
8);
dl_ch -= 16;
}
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+2) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 6;
ch[1] = ch_1 / 6;
dl_ch[6] += (ch[0] * 1365)>>15; // 1/12*16384
dl_ch[7] += (ch[1] * 1365)>>15; // 1/12*16384
dl_ch += 8;
multadd_real_vector_complex_scalar(filt8_avlip3,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip6,
ch,
dl_ch,
8);
}
else { // this is case without frequency-domain linear interpolation, just take average of LS channel estimates of 4 DMRS REs and use a common value for the whole PRB
int32_t ch_0, ch_1;
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 4;
ch[1] = ch_1 / 4;
multadd_real_vector_complex_scalar(filt8_avlip0,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip1,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip2,
ch,
dl_ch,
8);
dl_ch -= 24;
for (pilot_cnt=4; pilot_cnt<4*(nb_rb_pdsch-1); pilot_cnt += 4) {
int32_t ch_0, ch_1;
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 4;
ch[1] = ch_1 / 4;
dl_ch[6] += (ch[0] * 1365)>>15; // 1/12*16384
dl_ch[7] += (ch[1] * 1365)>>15; // 1/12*16384
dl_ch += 8;
multadd_real_vector_complex_scalar(filt8_avlip3,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip4,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip5,
ch,
dl_ch,
8);
dl_ch -= 16;
}
ch_0 = ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 = ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+1) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch_0 += ((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15;
ch_1 += ((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15;
pil += 2;
re_offset = (re_offset+5) % ue->frame_parms.ofdm_symbol_size;
rxF = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
ch[0] = ch_0 / 4;
ch[1] = ch_1 / 4;
dl_ch[6] += (ch[0] * 1365)>>15; // 1/12*16384
dl_ch[7] += (ch[1] * 1365)>>15; // 1/12*16384
dl_ch += 8;
multadd_real_vector_complex_scalar(filt8_avlip3,
ch,
dl_ch,
8);
dl_ch += 16;
multadd_real_vector_complex_scalar(filt8_avlip6,
ch,
dl_ch,
8);
}
#ifdef DEBUG_PDSCH
dl_ch = (int16_t *)&dl_ch_estimates[p*ue->frame_parms.nb_antennas_rx+aarx][ch_offset];
for(uint16_t idxP=0; idxP<ceil((float)nb_rb_pdsch*12/8); idxP++) {
for(uint8_t idxI=0; idxI<16; idxI += 2) {
printf("%d\t%d\t",dl_ch[idxP*16+idxI],dl_ch[idxP*16+idxI+1]);
}
printf("%d\n",idxP);
}
#endif
}
return(0);
}
/*******************************************************************
*
* NAME : nr_pdsch_ptrs_processing
*
* PARAMETERS : PHY_VARS_NR_UE : ue data structure
* NR_UE_PDSCH : pdsch_vars pointer
* NR_DL_FRAME_PARMS : frame_parms pointer
* NR_DL_UE_HARQ_t : dlsch0_harq pointer
* NR_DL_UE_HARQ_t : dlsch1_harq pointer
* uint8_t : gNB_id,
* uint8_t : nr_slot_rx,
* unsigned char : symbol,
* uint32_t : nb_re_pdsch,
* uint16_t : rnti
* RX_type_t : rx_type
* RETURN : Nothing
*
* DESCRIPTION :
* If ptrs is enabled process the symbol accordingly
* 1) Estimate common phase error per PTRS symbol
* 2) Interpolate PTRS estimated value in TD after all PTRS symbols
* 3) Compensate signal with PTRS estimation for slot
*********************************************************************/
void nr_pdsch_ptrs_processing(PHY_VARS_NR_UE *ue,
NR_UE_PDSCH **pdsch_vars,
NR_DL_FRAME_PARMS *frame_parms,
NR_DL_UE_HARQ_t *dlsch0_harq,
NR_DL_UE_HARQ_t *dlsch1_harq,
uint8_t gNB_id,
uint8_t nr_slot_rx,
unsigned char symbol,
uint32_t nb_re_pdsch,
uint16_t rnti,
RX_type_t rx_type)
{
//#define DEBUG_DL_PTRS 1
int16_t *phase_per_symbol = NULL;
int32_t *ptrs_re_symbol = NULL;
int8_t ret = 0;
/* harq specific variables */
uint8_t symbInSlot = 0;
uint16_t *startSymbIndex = NULL;
uint16_t *nbSymb = NULL;
uint8_t *L_ptrs = NULL;
uint8_t *K_ptrs = NULL;
uint16_t *dmrsSymbPos = NULL;
uint16_t *ptrsSymbPos = NULL;
uint8_t *ptrsSymbIdx = NULL;
uint8_t *ptrsReOffset = NULL;
uint8_t *dmrsConfigType = NULL;
uint16_t *nb_rb = NULL;
if(dlsch0_harq->status == ACTIVE) {
symbInSlot = dlsch0_harq->start_symbol + dlsch0_harq->nb_symbols;
startSymbIndex = &dlsch0_harq->start_symbol;
nbSymb = &dlsch0_harq->nb_symbols;
L_ptrs = &dlsch0_harq->PTRSTimeDensity;
K_ptrs = &dlsch0_harq->PTRSFreqDensity;
dmrsSymbPos = &dlsch0_harq->dlDmrsSymbPos;
ptrsSymbPos = &dlsch0_harq->ptrs_symbols;
ptrsSymbIdx = &dlsch0_harq->ptrs_symbol_index;
ptrsReOffset = &dlsch0_harq->PTRSReOffset;
dmrsConfigType = &dlsch0_harq->dmrsConfigType;
nb_rb = &dlsch0_harq->nb_rb;
}
if(dlsch1_harq) {
symbInSlot = dlsch1_harq->start_symbol + dlsch0_harq->nb_symbols;
startSymbIndex = &dlsch1_harq->start_symbol;
nbSymb = &dlsch1_harq->nb_symbols;
L_ptrs = &dlsch1_harq->PTRSTimeDensity;
K_ptrs = &dlsch1_harq->PTRSFreqDensity;
dmrsSymbPos = &dlsch1_harq->dlDmrsSymbPos;
ptrsSymbPos = &dlsch1_harq->ptrs_symbols;
ptrsSymbIdx = &dlsch1_harq->ptrs_symbol_index;
ptrsReOffset = &dlsch1_harq->PTRSReOffset;
dmrsConfigType = &dlsch1_harq->dmrsConfigType;
nb_rb = &dlsch1_harq->nb_rb;
}
/* loop over antennas */
for (int aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
phase_per_symbol = (int16_t*)pdsch_vars[gNB_id]->ptrs_phase_per_slot[aarx];
ptrs_re_symbol = (int32_t*)pdsch_vars[gNB_id]->ptrs_re_per_slot[aarx];
ptrs_re_symbol[symbol] = 0;
phase_per_symbol[(2*symbol)+1] = 0; // Imag
/* set DMRS estimates to 0 angle with magnitude 1 */
if(is_dmrs_symbol(symbol,*dmrsSymbPos)) {
/* set DMRS real estimation to 32767 */
phase_per_symbol[2*symbol]=(int16_t)((1<<15)-1); // 32767
#ifdef DEBUG_DL_PTRS
printf("[PHY][PTRS]: DMRS Symbol %d -> %4d + j*%4d\n", symbol, phase_per_symbol[2*symbol],phase_per_symbol[(2*symbol)+1]);
#endif
}
else { // real ptrs value is set to 0
phase_per_symbol[2*symbol] = 0; // Real
}
if(dlsch0_harq->status == ACTIVE) {
if(symbol == *startSymbIndex) {
*ptrsSymbPos = 0;
set_ptrs_symb_idx(ptrsSymbPos,
*nbSymb,
*startSymbIndex,
1<< *L_ptrs,
*dmrsSymbPos);
}
/* if not PTRS symbol set current ptrs symbol index to zero*/
*ptrsSymbIdx = 0;
/* Check if current symbol contains PTRS */
if(is_ptrs_symbol(symbol, *ptrsSymbPos)) {
*ptrsSymbIdx = symbol;
/*------------------------------------------------------------------------------------------------------- */
/* 1) Estimate common phase error per PTRS symbol */
/*------------------------------------------------------------------------------------------------------- */
nr_ptrs_cpe_estimation(*K_ptrs,*ptrsReOffset,*dmrsConfigType,*nb_rb,
rnti,
(int16_t *)&pdsch_vars[gNB_id]->dl_ch_ptrs_estimates_ext[aarx][symbol*nb_re_pdsch],
nr_slot_rx,
symbol,frame_parms->ofdm_symbol_size,
(int16_t*)&pdsch_vars[gNB_id]->rxdataF_comp0[aarx][(symbol * nb_re_pdsch)],
ue->nr_gold_pdsch[gNB_id][nr_slot_rx][symbol][0],
&phase_per_symbol[2* symbol],
&ptrs_re_symbol[symbol]);
}
}// HARQ 0
/* For last OFDM symbol at each antenna perform interpolation and compensation for the slot*/
if(symbol == (symbInSlot -1)) {
/*------------------------------------------------------------------------------------------------------- */
/* 2) Interpolate PTRS estimated value in TD */
/*------------------------------------------------------------------------------------------------------- */
/* If L-PTRS is > 0 then we need interpolation */
if(*L_ptrs > 0) {
ret = nr_ptrs_process_slot(*dmrsSymbPos, *ptrsSymbPos, phase_per_symbol, *startSymbIndex, *nbSymb);
if(ret != 0) {
LOG_W(PHY,"[PTRS] Compensation is skipped due to error in PTRS slot processing !!\n");
}
}
#ifdef DEBUG_DL_PTRS
LOG_M("ptrsEst.m","est",pdsch_vars[gNB_id]->ptrs_phase_per_slot[aarx],frame_parms->symbols_per_slot,1,1 );
LOG_M("rxdataF_bf_ptrs_comp.m","bf_ptrs_cmp",
&pdsch_vars[gNB_id]->rxdataF_comp0[aarx][(*startSymbIndex) * NR_NB_SC_PER_RB * (*nb_rb) ],
(*nb_rb) * NR_NB_SC_PER_RB * (*nbSymb),1,1);
#endif
/*------------------------------------------------------------------------------------------------------- */
/* 3) Compensated DMRS based estimated signal with PTRS estimation */
/*--------------------------------------------------------------------------------------------------------*/
for(uint8_t i = *startSymbIndex; i< symbInSlot ;i++) {
/* DMRS Symbol has 0 phase so no need to rotate the respective symbol */
/* Skip rotation if the slot processing is wrong */
if((!is_dmrs_symbol(i,*dmrsSymbPos)) && (ret == 0)) {
#ifdef DEBUG_DL_PTRS
printf("[PHY][DL][PTRS]: Rotate Symbol %2d with %d + j* %d\n", i, phase_per_symbol[2* i],phase_per_symbol[(2* i) +1]);
#endif
rotate_cpx_vector((int16_t*)&pdsch_vars[gNB_id]->rxdataF_comp0[aarx][(i * (*nb_rb) * NR_NB_SC_PER_RB)],
&phase_per_symbol[2* i],
(int16_t*)&pdsch_vars[gNB_id]->rxdataF_comp0[aarx][(i * (*nb_rb) * NR_NB_SC_PER_RB)],
((*nb_rb) * NR_NB_SC_PER_RB), 15);
}// if not DMRS Symbol
}// symbol loop
}// last symbol check
}//Antenna loop
}//main function
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