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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 1.1 (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
*/
/*! \file PHY/NR_TRANSPORT/srs_rx.c
* \brief Top-level routines for getting the SRS physical channel
* \date 2021
* \version 1.0
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "PHY/INIT/nr_phy_init.h"
#include "PHY/impl_defs_nr.h"
#include "PHY/defs_nr_common.h"
#include "PHY/defs_gNB.h"
#include "PHY/CODING/nrSmallBlock/nr_small_block_defs.h"
#include "PHY/NR_UE_TRANSPORT/srs_modulation_nr.h"
#include "common/utils/LOG/log.h"
#include "nfapi/oai_integration/vendor_ext.h"
#include "T.h"
//#define SRS_DEBUG
void nr_fill_srs(PHY_VARS_gNB *gNB, frame_t frame, slot_t slot, nfapi_nr_srs_pdu_t *srs_pdu)
{
bool found = false;
for (int i = 0; i < gNB->max_nb_srs; i++) {
NR_gNB_SRS_t *srs = &gNB->srs[i];
if (srs->active == 0) {
found = true;
srs->frame = frame;
srs->slot = slot;
srs->active = 1;
memcpy((void *)&srs->srs_pdu, (void *)srs_pdu, sizeof(nfapi_nr_srs_pdu_t));
break;
}
}
AssertFatal(found, "SRS list is full\n");
}
int nr_get_srs_signal(PHY_VARS_gNB *gNB,
frame_t frame,
slot_t slot,
nfapi_nr_srs_pdu_t *srs_pdu,
nr_srs_info_t *nr_srs_info,
int32_t srs_received_signal[][gNB->frame_parms.ofdm_symbol_size*(1<<srs_pdu->num_symbols)]) {
#ifdef SRS_DEBUG
LOG_I(NR_PHY,"Calling %s function\n", __FUNCTION__);
#endif
c16_t **rxdataF = gNB->common_vars.rxdataF;
const NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
const uint16_t n_symbols = (slot&3)*frame_parms->symbols_per_slot; // number of symbols until this slot
const uint8_t l0 = frame_parms->symbols_per_slot - 1 - srs_pdu->time_start_position; // starting symbol in this slot
const uint64_t symbol_offset = (n_symbols+l0)*frame_parms->ofdm_symbol_size;
const uint64_t subcarrier_offset = frame_parms->first_carrier_offset + srs_pdu->bwp_start*NR_NB_SC_PER_RB;
const uint8_t N_ap = 1<<srs_pdu->num_ant_ports;
const uint8_t N_symb_SRS = 1<<srs_pdu->num_symbols;
const uint8_t K_TC = 2<<srs_pdu->comb_size;
const uint16_t M_sc_b_SRS = srs_bandwidth_config[srs_pdu->config_index][srs_pdu->bandwidth_index][0] * NR_NB_SC_PER_RB/K_TC;
int32_t *rx_signal;
bool no_srs_signal = true;
for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++) {
memset(srs_received_signal[ant], 0, frame_parms->ofdm_symbol_size*sizeof(int32_t));
rx_signal = (int32_t *)&rxdataF[ant][symbol_offset];
for (int p_index = 0; p_index < N_ap; p_index++) {
#ifdef SRS_DEBUG
LOG_I(NR_PHY,"===== UE port %d --> gNB Rx antenna %i =====\n", p_index, ant);
#endif
for (int l_line = 0; l_line < N_symb_SRS; l_line++) {
#ifdef SRS_DEBUG
LOG_I(NR_PHY,":::::::: OFDM symbol %d ::::::::\n", l0+l_line);
#endif
uint16_t subcarrier = subcarrier_offset + nr_srs_info->k_0_p[p_index][l_line];
if (subcarrier>frame_parms->ofdm_symbol_size) {
subcarrier -= frame_parms->ofdm_symbol_size;
}
uint16_t l_line_offset = l_line*frame_parms->ofdm_symbol_size;
for (int k = 0; k < M_sc_b_SRS; k++) {
srs_received_signal[ant][l_line_offset+subcarrier] = rx_signal[l_line_offset+subcarrier];
if (rx_signal[l_line_offset+subcarrier] != 0) {
no_srs_signal = false;
}
#ifdef SRS_DEBUG
int subcarrier_log = subcarrier-subcarrier_offset;
if(subcarrier_log < 0) {
subcarrier_log = subcarrier_log + frame_parms->ofdm_symbol_size;
}
if(subcarrier_log%12 == 0) {
LOG_I(NR_PHY,"------------ %d ------------\n", subcarrier_log/12);
}
LOG_I(NR_PHY,"(%i) \t%i\t%i\n",
subcarrier_log,
(int16_t)(srs_received_signal[ant][l_line_offset+subcarrier]&0xFFFF),
(int16_t)((srs_received_signal[ant][l_line_offset+subcarrier]>>16)&0xFFFF));
#endif
// Subcarrier increment
subcarrier += K_TC;
if (subcarrier >= frame_parms->ofdm_symbol_size) {
subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
}
} // for (int k = 0; k < M_sc_b_SRS; k++)
} // for (int l_line = 0; l_line < N_symb_SRS; l_line++)
} // for (int p_index = 0; p_index < N_ap; p_index++)
} // for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++)
if (no_srs_signal) {
LOG_W(NR_PHY, "No SRS signal\n");
return -1;
} else {
return 0;
}
}