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openairinterface5g/openair1/PHY/MODULATION/slot_fep.c
T
Robert Schmidt 8107939f08 Change OAI license to CSSL v1.0 (and others) 
- all RAN code, CI code, configuration files, dockerfiles, in CSSL v1.0
- all deployment code (openshift, charts, ancillary files like shell
  scripts), in MIT
- documentation in CC-BY-4.0
- exceptions might apply and are listed in NOTICE
- there is a new LICENSES folder with all licenses
- CONTRIBUTIONS.md has been updated accordingly

For automated changes based on OAI PL v1.1:

    perl -i~ -0pe 's/\/\*.*Licensed to the OpenAirInterface.*openairinterface.org\n#?/\/*\n * SPDX-License-Identifier: LicenseRef-CSSL-1.0\n/s' **/*.{c,h,cpp}
    perl -i~ -0pe 's/\/\*.*Licensed to the OpenAirInterface.*openairinterface.org\n#?/\/*\n * SPDX-License-Identifier: LicenseRef-CSSL-1.0\n/s' **/*.ts
    perl -i~ -0pe 's/<!--.*Licensed to the OpenAirInterface.*openairinterface.org\n.*-->/<!-- SPDX-License-Identifier: LicenseRef-CSSL-1.0 -->/s' **/*.xml

The rest (cmake, files with missing license, cmake) manually.
2026-03-27 16:36:37 +01:00

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/*
* SPDX-License-Identifier: LicenseRef-CSSL-1.0
*/
#include "PHY/defs_UE.h"
#include "modulation_UE.h"
#include "PHY/LTE_ESTIMATION/lte_estimation.h"
//#define DEBUG_FEP
#define SOFFSET 0
int slot_fep(PHY_VARS_UE *ue,
unsigned char l,
unsigned char Ns,
int sample_offset,
int no_prefix,
int reset_freq_est) {
LTE_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
LTE_UE_COMMON *common_vars = &ue->common_vars;
uint8_t eNB_id = 0;//ue_common_vars->eNb_id;
unsigned char aa;
unsigned char symbol = l+((7-frame_parms->Ncp)*(Ns&1)); ///symbol within sub-frame
unsigned int nb_prefix_samples = (no_prefix ? 0 : frame_parms->nb_prefix_samples);
unsigned int nb_prefix_samples0 = (no_prefix ? 0 : frame_parms->nb_prefix_samples0);
unsigned int subframe_offset;//,subframe_offset_F;
unsigned int slot_offset;
int i;
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
unsigned int rx_offset;
/*LTE_UE_DLSCH_t **dlsch_ue = phy_vars_ue->dlsch_ue[eNB_id];
unsigned char harq_pid = dlsch_ue[0]->current_harq_pid;
LTE_DL_UE_HARQ_t *dlsch0_harq = dlsch_ue[0]->harq_processes[harq_pid];
int uespec_pilot[9][1200];*/
int tmp_dft_in[2048] __attribute__ ((aligned (32))); // This is for misalignment issues for 6 and 15 PRBs
int s = frame_parms->ofdm_symbol_size;
if (s != 128 && s != 256 && s != 512 && s != 1024 && s != 1536 && s != 2048)
s = 512;
const dft_size_idx_t dftsizeidx = get_dft(s);
if (no_prefix) {
subframe_offset = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
slot_offset = frame_parms->ofdm_symbol_size * (frame_parms->symbols_per_tti>>1) * (Ns%2);
} else {
subframe_offset = frame_parms->samples_per_tti * (Ns>>1);
slot_offset = (frame_parms->samples_per_tti>>1) * (Ns%2);
}
// subframe_offset_F = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
if (l<0 || l>=7-frame_parms->Ncp) {
printf("slot_fep: l must be between 0 and %d\n",7-frame_parms->Ncp);
return(-1);
}
if (Ns<0 || Ns>=20) {
printf("slot_fep: Ns must be between 0 and 19\n");
return(-1);
}
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
memset(&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],0,frame_parms->ofdm_symbol_size*sizeof(int));
rx_offset = sample_offset + slot_offset + nb_prefix_samples0 + subframe_offset - SOFFSET;
// Align with 256 bit
// rx_offset = rx_offset&0xfffffff8;
if (l==0) {
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((short *)&common_vars->rxdata[aa][frame_length_samples],
(short *)&common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
if ((rx_offset&7)!=0) { // if input to dft is not 256-bit aligned, issue for size 6,15 and 25 PRBs
memcpy((void *)tmp_dft_in,
(void *)&common_vars->rxdata[aa][rx_offset % frame_length_samples],
frame_parms->ofdm_symbol_size*sizeof(int));
dft(dftsizeidx,(int16_t *)tmp_dft_in,
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
} else { // use dft input from RX buffer directly
start_UE_TIMING(ue->rx_dft_stats);
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
stop_UE_TIMING(ue->rx_dft_stats);
}
} else {
rx_offset += (frame_parms->ofdm_symbol_size+nb_prefix_samples)*l;// +
// (frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1);
#ifdef DEBUG_FEP
// if (ue->frame <100)
LOG_I(PHY,"slot_fep: frame %d: slot %d, symbol %d, nb_prefix_samples %d, nb_prefix_samples0 %d, slot_offset %d, subframe_offset %d, sample_offset %d,rx_offset %d, frame_length_samples %d\n",
ue->proc.proc_rxtx[(Ns>>1)&1].frame_rx,Ns, symbol,
nb_prefix_samples,nb_prefix_samples0,slot_offset,subframe_offset,sample_offset,rx_offset,frame_length_samples);
#endif
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((void *)&common_vars->rxdata[aa][frame_length_samples],
(void *)&common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
start_UE_TIMING(ue->rx_dft_stats);
if ((rx_offset&7)!=0) { // if input to dft is not 128-bit aligned, issue for size 6 and 15 PRBs
memcpy((void *)tmp_dft_in,
(void *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
frame_parms->ofdm_symbol_size*sizeof(int));
dft(dftsizeidx,(int16_t *)tmp_dft_in,
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
} else { // use dft input from RX buffer directly
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
}
stop_UE_TIMING(ue->rx_dft_stats);
}
#ifdef DEBUG_FEP
// if (ue->frame <100)
printf("slot_fep: frame %d: symbol %d rx_offset %u\n", ue->proc.proc_rxtx[(Ns>>1)&1].frame_rx, symbol,rx_offset);
#endif
}
if (ue->perfect_ce == 0) {
if ((l==0) || (l==(4-frame_parms->Ncp))) {
for (aa=0; aa<frame_parms->nb_antenna_ports_eNB; aa++) {
#ifdef DEBUG_FEP
printf("Channel estimation eNB %d, aatx %d, slot %d, symbol %d\n",eNB_id,aa,Ns,l);
#endif
start_UE_TIMING(ue->dlsch_channel_estimation_stats);
lte_dl_channel_estimation(ue,eNB_id,0,
Ns,
aa,
l,
symbol);
stop_UE_TIMING(ue->dlsch_channel_estimation_stats);
for (i=0; i<ue->measurements.n_adj_cells; i++) {
lte_dl_channel_estimation(ue,eNB_id,i+1,
Ns,
aa,
l,
symbol);
}
}
// do frequency offset estimation here!
// use channel estimates from current symbol (=ch_t) and last symbol (ch_{t-1})
#ifdef DEBUG_FEP
printf("Frequency offset estimation\n");
#endif
if (l==(4-frame_parms->Ncp)) {
start_UE_TIMING(ue->dlsch_freq_offset_estimation_stats);
lte_est_freq_offset(common_vars->common_vars_rx_data_per_thread[ue->current_thread_id[Ns>>1]].dl_ch_estimates[0],
frame_parms,
l,
&common_vars->freq_offset,
reset_freq_est);
stop_UE_TIMING(ue->dlsch_freq_offset_estimation_stats);
}
}
}
#ifdef DEBUG_FEP
printf("slot_fep: done\n");
#endif
return(0);
}
int front_end_fft(PHY_VARS_UE *ue,
unsigned char l,
unsigned char Ns,
int sample_offset,
int no_prefix) {
LTE_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
LTE_UE_COMMON *common_vars = &ue->common_vars;
unsigned char aa;
unsigned char symbol = l+((7-frame_parms->Ncp)*(Ns&1)); ///symbol within sub-frame
unsigned int nb_prefix_samples = (no_prefix ? 0 : frame_parms->nb_prefix_samples);
unsigned int nb_prefix_samples0 = (no_prefix ? 0 : frame_parms->nb_prefix_samples0);
unsigned int subframe_offset;//,subframe_offset_F;
unsigned int slot_offset;
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
unsigned int rx_offset;
uint8_t threadId;
/*LTE_UE_DLSCH_t **dlsch_ue = phy_vars_ue->dlsch_ue[eNB_id];
unsigned char harq_pid = dlsch_ue[0]->current_harq_pid;
LTE_DL_UE_HARQ_t *dlsch0_harq = dlsch_ue[0]->harq_processes[harq_pid];
int uespec_pilot[9][1200];*/
int tmp_dft_in[2048] __attribute__ ((aligned (32))); // This is for misalignment issues for 6 and 15 PRBs
int s = frame_parms->ofdm_symbol_size;
if (s != 128 && s != 256 && s != 512 && s != 1024 && s != 1536 && s != 2048)
s = 512;
dft_size_idx_t dftsizeidx = get_dft(s);
if (no_prefix) {
subframe_offset = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
slot_offset = frame_parms->ofdm_symbol_size * (frame_parms->symbols_per_tti>>1) * (Ns%2);
} else {
subframe_offset = frame_parms->samples_per_tti * (Ns>>1);
slot_offset = (frame_parms->samples_per_tti>>1) * (Ns%2);
}
// subframe_offset_F = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
if (l<0 || l>=7-frame_parms->Ncp) {
printf("slot_fep: l must be between 0 and %d\n",7-frame_parms->Ncp);
return(-1);
}
if (Ns<0 || Ns>=20) {
printf("slot_fep: Ns must be between 0 and 19\n");
return(-1);
}
threadId = ue->current_thread_id[Ns>>1];
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
// change thread index
memset(&common_vars->common_vars_rx_data_per_thread[threadId].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],0,frame_parms->ofdm_symbol_size*sizeof(int));
rx_offset = sample_offset + slot_offset + nb_prefix_samples0 + subframe_offset - SOFFSET;
// Align with 256 bit
// rx_offset = rx_offset&0xfffffff8;
if (l==0) {
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((short *)&common_vars->rxdata[aa][frame_length_samples],
(short *)&common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
if ((rx_offset&7)!=0) { // if input to dft is not 256-bit aligned, issue for size 6,15 and 25 PRBs
memcpy((void *)tmp_dft_in,
(void *)&common_vars->rxdata[aa][rx_offset % frame_length_samples],
frame_parms->ofdm_symbol_size*sizeof(int));
dft(dftsizeidx,(int16_t *)tmp_dft_in,
(int16_t *)&common_vars->common_vars_rx_data_per_thread[threadId].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
} else { // use dft input from RX buffer directly
start_meas(&ue->rx_dft_stats);
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[threadId].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
stop_meas(&ue->rx_dft_stats);
}
} else {
rx_offset += (frame_parms->ofdm_symbol_size+nb_prefix_samples)*l;// +
// (frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1);
#ifdef DEBUG_FEP
// if (ue->frame <100)
LOG_I(PHY,
"slot_fep: frame %d: slot %d, threadId %d, symbol %d, nb_prefix_samples %d, nb_prefix_samples0 %d, slot_offset %d, subframe_offset %d, sample_offset %d,rx_offset %d, frame_length_samples %d\n",
ue->proc.proc_rxtx[threadId].frame_rx,Ns, threadId,symbol,
nb_prefix_samples,nb_prefix_samples0,slot_offset,subframe_offset,sample_offset,rx_offset,frame_length_samples);
#endif
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((void *)&common_vars->rxdata[aa][frame_length_samples],
(void *)&common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
start_meas(&ue->rx_dft_stats);
if ((rx_offset&7)!=0) { // if input to dft is not 128-bit aligned, issue for size 6 and 15 PRBs
memcpy((void *)tmp_dft_in,
(void *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
frame_parms->ofdm_symbol_size*sizeof(int));
dft(dftsizeidx,(int16_t *)tmp_dft_in,
(int16_t *)&common_vars->common_vars_rx_data_per_thread[threadId].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
} else { // use dft input from RX buffer directly
dft(dftsizeidx,(int16_t *)&common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&common_vars->common_vars_rx_data_per_thread[threadId].rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
}
stop_meas(&ue->rx_dft_stats);
}
#ifdef DEBUG_FEP
// if (ue->frame <100)
printf("slot_fep: frame %d: symbol %d rx_offset %u\n", ue->proc.proc_rxtx[threadId].frame_rx, symbol,rx_offset);
#endif
}
return(0);
}
int front_end_chanEst(PHY_VARS_UE *ue,
unsigned char l,
unsigned char Ns,
int reset_freq_est) {
LTE_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
LTE_UE_COMMON *common_vars = &ue->common_vars;
uint8_t eNB_id = 0;//ue_common_vars->eNb_id;
unsigned char aa;
unsigned char symbol = l+((7-frame_parms->Ncp)*(Ns&1)); ///symbol within sub-frame
int i;
/*LTE_UE_DLSCH_t **dlsch_ue = phy_vars_ue->dlsch_ue[eNB_id];
unsigned char harq_pid = dlsch_ue[0]->current_harq_pid;
LTE_DL_UE_HARQ_t *dlsch0_harq = dlsch_ue[0]->harq_processes[harq_pid];
int uespec_pilot[9][1200];*/
if (ue->perfect_ce == 0) {
if ((l==0) || (l==(4-frame_parms->Ncp))) {
for (aa=0; aa<frame_parms->nb_antenna_ports_eNB; aa++) {
#ifdef DEBUG_FEP
printf("Channel estimation eNB %d, aatx %d, slot %d, symbol %d\n",eNB_id,aa,Ns,l);
#endif
start_meas(&ue->dlsch_channel_estimation_stats);
lte_dl_channel_estimation(ue,eNB_id,0,
Ns,
aa,
l,
symbol);
stop_meas(&ue->dlsch_channel_estimation_stats);
for (i=0; i<ue->measurements.n_adj_cells; i++) {
lte_dl_channel_estimation(ue,eNB_id,i+1,
Ns,
aa,
l,
symbol);
}
}
// do frequency offset estimation here!
// use channel estimates from current symbol (=ch_t) and last symbol (ch_{t-1})
#ifdef DEBUG_FEP
printf("Frequency offset estimation\n");
#endif
if (l==(4-frame_parms->Ncp)) {
start_meas(&ue->dlsch_freq_offset_estimation_stats);
lte_est_freq_offset(common_vars->common_vars_rx_data_per_thread[(Ns>>1)&0x1].dl_ch_estimates[0],
frame_parms,
l,
&common_vars->freq_offset,
reset_freq_est);
stop_meas(&ue->dlsch_freq_offset_estimation_stats);
}
}
}
return(0);
}
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