162 lines
6.1 KiB
C
162 lines
6.1 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file PHY/NR_TRANSPORT/srs_rx.c
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* \brief Top-level routines for getting the SRS physical channel
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* \date 2021
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* \version 1.0
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "PHY/INIT/nr_phy_init.h"
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#include "PHY/impl_defs_nr.h"
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#include "PHY/defs_nr_common.h"
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#include "PHY/defs_gNB.h"
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#include "PHY/defs_RU.h"
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#include "PHY/CODING/nrSmallBlock/nr_small_block_defs.h"
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#include "PHY/NR_UE_TRANSPORT/srs_modulation_nr.h"
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#include "common/utils/LOG/log.h"
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#include "SCHED_NR/sched_nr.h"
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#include "nfapi/oai_integration/vendor_ext.h"
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#include "T.h"
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//#define SRS_DEBUG
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void nr_fill_srs(PHY_VARS_gNB *gNB, frame_t frame, slot_t slot, nfapi_nr_srs_pdu_t *srs_pdu)
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{
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bool found = false;
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for (int i = 0; i < gNB->max_nb_srs; i++) {
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NR_gNB_SRS_t *srs = &gNB->srs[i];
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if (srs->active == false) {
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found = true;
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srs->frame = frame;
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srs->slot = slot;
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srs->active = true;
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srs->beam_nb = 0;
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if (gNB->common_vars.beam_id) {
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int bitmap = SL_to_bitmap(srs_pdu->time_start_position, 1 << srs_pdu->num_symbols);
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int fapi_beam_idx = srs_pdu->beamforming.prgs_list[0].dig_bf_interface_list[0].beam_idx;
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srs->beam_nb = beam_index_allocation(gNB->enable_analog_das,
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fapi_beam_idx,
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&gNB->gNB_config.analog_beamforming_ve,
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&gNB->common_vars,
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slot,
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NR_NUMBER_OF_SYMBOLS_PER_SLOT,
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bitmap);
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}
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memcpy((void *)&srs->srs_pdu, (void *)srs_pdu, sizeof(nfapi_nr_srs_pdu_t));
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break;
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}
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}
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AssertFatal(found, "SRS list is full\n");
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}
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int nr_get_srs_signal(PHY_VARS_gNB *gNB,
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c16_t **rxdataF,
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frame_t frame,
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slot_t slot,
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nfapi_nr_srs_pdu_t *srs_pdu,
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nr_srs_info_t *nr_srs_info,
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c16_t srs_received_signal[][gNB->frame_parms.ofdm_symbol_size * (1 << srs_pdu->num_symbols)])
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{
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const NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
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const uint16_t n_symbols = (slot % RU_RX_SLOT_DEPTH) * frame_parms->symbols_per_slot; // number of symbols until this slot
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const uint8_t l0 = srs_pdu->time_start_position; // starting symbol in this slot
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const uint64_t symbol_offset = (n_symbols + l0) * frame_parms->ofdm_symbol_size;
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const uint64_t subcarrier_offset = frame_parms->first_carrier_offset + srs_pdu->bwp_start*NR_NB_SC_PER_RB;
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const uint8_t N_ap = 1<<srs_pdu->num_ant_ports;
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const uint8_t N_symb_SRS = 1 << srs_pdu->num_symbols;
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const uint8_t K_TC = 2 << srs_pdu->comb_size;
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const uint16_t M_sc_b_SRS = get_m_srs(srs_pdu->config_index, srs_pdu->bandwidth_index) * NR_NB_SC_PER_RB / K_TC;
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c16_t *rx_signal;
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bool no_srs_signal = true;
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for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++) {
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memset(srs_received_signal[ant], 0, frame_parms->ofdm_symbol_size * sizeof(c16_t));
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rx_signal = &rxdataF[ant][symbol_offset];
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for (int p_index = 0; p_index < N_ap; p_index++) {
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"===== UE port %d --> gNB Rx antenna %i =====\n", p_index, ant);
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#endif
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for (int l_line = 0; l_line < N_symb_SRS; l_line++) {
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,":::::::: OFDM symbol %d ::::::::\n", l0+l_line);
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#endif
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uint16_t subcarrier = subcarrier_offset + nr_srs_info->k_0_p[p_index][l_line];
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if (subcarrier>frame_parms->ofdm_symbol_size) {
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subcarrier -= frame_parms->ofdm_symbol_size;
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}
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uint16_t l_line_offset = l_line*frame_parms->ofdm_symbol_size;
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for (int k = 0; k < M_sc_b_SRS; k++) {
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srs_received_signal[ant][l_line_offset+subcarrier] = rx_signal[l_line_offset+subcarrier];
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if (rx_signal[l_line_offset + subcarrier].r || rx_signal[l_line_offset + subcarrier].i) {
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no_srs_signal = false;
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}
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#ifdef SRS_DEBUG
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int subcarrier_log = subcarrier-subcarrier_offset;
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if(subcarrier_log < 0) {
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subcarrier_log = subcarrier_log + frame_parms->ofdm_symbol_size;
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}
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if(subcarrier_log%12 == 0) {
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LOG_I(NR_PHY,"------------ %d ------------\n", subcarrier_log/12);
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}
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LOG_I(NR_PHY,
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"(%i) \t%i\t%i\n",
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subcarrier_log,
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srs_received_signal[ant][l_line_offset + subcarrier].r,
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srs_received_signal[ant][l_line_offset + subcarrier].i);
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#endif
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// Subcarrier increment
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subcarrier += K_TC;
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if (subcarrier >= frame_parms->ofdm_symbol_size) {
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subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
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}
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} // for (int k = 0; k < M_sc_b_SRS; k++)
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} // for (int l_line = 0; l_line < N_symb_SRS; l_line++)
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} // for (int p_index = 0; p_index < N_ap; p_index++)
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} // for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++)
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if (no_srs_signal) {
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LOG_W(NR_PHY, "No SRS signal\n");
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return -1;
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} else {
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return 0;
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}
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}
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