139 lines
4.7 KiB
C
139 lines
4.7 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/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 <openair1/PHY/CODING/nrSmallBlock/nr_small_block_defs.h>
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#include "common/utils/LOG/log.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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NR_gNB_SRS_t *new_gNB_srs(void){
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NR_gNB_SRS_t *srs;
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srs = (NR_gNB_SRS_t *)malloc16(sizeof(NR_gNB_SRS_t));
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srs->active = 0;
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return (srs);
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}
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int nr_find_srs(uint16_t rnti,
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int frame,
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int slot,
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PHY_VARS_gNB *gNB) {
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AssertFatal(gNB!=NULL,"gNB is null\n");
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int index = -1;
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for (int i=0; i<NUMBER_OF_NR_SRS_MAX; i++) {
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AssertFatal(gNB->srs[i]!=NULL,"gNB->srs[%d] is null\n",i);
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if ((gNB->srs[i]->active>0) &&
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(gNB->srs[i]->srs_pdu.rnti==rnti) &&
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(gNB->srs[i]->frame==frame) &&
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(gNB->srs[i]->slot==slot)) return(i);
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else if ((gNB->srs[i]->active == 0) && (index==-1)) index=i;
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}
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if (index==-1)
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LOG_E(MAC,"SRS list is full\n");
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return(index);
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}
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void nr_fill_srs(PHY_VARS_gNB *gNB,
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int frame,
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int slot,
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nfapi_nr_srs_pdu_t *srs_pdu) {
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int id = nr_find_srs(srs_pdu->rnti,frame,slot,gNB);
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AssertFatal( (id>=0) && (id<NUMBER_OF_NR_SRS_MAX),
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"invalid id found for srs !!! rnti %04x id %d\n",srs_pdu->rnti,id);
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NR_gNB_SRS_t *srs = gNB->srs[id];
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srs->frame = frame;
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srs->slot = slot;
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srs->active = 1;
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memcpy((void*)&srs->srs_pdu, (void*)srs_pdu, sizeof(nfapi_nr_srs_pdu_t));
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}
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int nr_get_srs_signal(PHY_VARS_gNB *gNB,
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int frame,
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int 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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int32_t **srs_received_signal) {
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if(nr_srs_info->sc_list_length == 0) {
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LOG_E(NR_PHY, "(%d.%d) nr_srs_info was not generated yet!\n", frame, slot);
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return -1;
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}
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int32_t **rxdataF = gNB->common_vars.rxdataF;
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NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
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uint16_t n_symbols = (slot&3)*frame_parms->symbols_per_slot; // number of symbols until this slot
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uint8_t l0 = frame_parms->symbols_per_slot - 1 - srs_pdu->time_start_position; // starting symbol in this slot
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uint64_t symbol_offset = (n_symbols+l0)*frame_parms->ofdm_symbol_size;
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int32_t *rx_signal;
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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(int32_t));
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rx_signal = &rxdataF[ant][symbol_offset];
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for(int sc_idx = 0; sc_idx < nr_srs_info->sc_list_length; sc_idx++) {
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srs_received_signal[ant][nr_srs_info->sc_list[sc_idx]] = rx_signal[nr_srs_info->sc_list[sc_idx]];
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#ifdef SRS_DEBUG
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uint64_t subcarrier_offset = frame_parms->first_carrier_offset + srs_pdu->bwp_start*12;
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int subcarrier_log = nr_srs_info->sc_list[sc_idx]-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(sc_idx == 0) {
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LOG_I(NR_PHY,"________ Rx antenna %i ________\n", ant);
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}
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if(subcarrier_log%12 == 0) {
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LOG_I(NR_PHY,"::::::::::::: %i :::::::::::::\n", subcarrier_log/12);
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}
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LOG_I(NR_PHY,"(%i) \t%i\t%i\n",
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subcarrier_log,
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(int16_t)(srs_received_signal[ant][nr_srs_info->sc_list[sc_idx]]&0xFFFF),
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(int16_t)((srs_received_signal[ant][nr_srs_info->sc_list[sc_idx]]>>16)&0xFFFF));
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#endif
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}
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}
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return 0;
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} |