72 lines
2.3 KiB
C
72 lines
2.3 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_ESTIMATION/nr_adjust_sync_gNB.c
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* \brief TA estimation for TA updates
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* \author Ahmed Hussein
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* \date 2019
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* \version 0.1
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* \company Fraunhofer IIS
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* \email: ahmed.hussein@iis.fraunhofer.de
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* \note
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* \warning
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*/
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#include "PHY/types.h"
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#include "PHY/defs_gNB.h"
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#include "PHY/phy_extern.h"
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#include "nr_ul_estimation.h"
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int nr_est_timing_advance_pusch(PHY_VARS_gNB* gNB, int UE_id)
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{
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int temp, i, aa, max_pos = 0, max_val = 0;
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short Re, Im;
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uint8_t cyclic_shift = 0;
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NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
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NR_gNB_PUSCH *gNB_pusch_vars = gNB->pusch_vars[UE_id];
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int32_t **ul_ch_estimates_time = gNB_pusch_vars->ul_ch_estimates_time;
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int sync_pos = (frame_parms->ofdm_symbol_size - cyclic_shift*frame_parms->ofdm_symbol_size/12) % (frame_parms->ofdm_symbol_size);
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for (i = 0; i < frame_parms->ofdm_symbol_size; i++) {
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temp = 0;
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for (aa = 0; aa < frame_parms->nb_antennas_rx; aa++) {
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Re = ((int16_t*)ul_ch_estimates_time[aa])[(i<<1)];
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Im = ((int16_t*)ul_ch_estimates_time[aa])[1+(i<<1)];
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temp += (Re*Re/2) + (Im*Im/2);
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}
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if (temp > max_val) {
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max_pos = i;
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max_val = temp;
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}
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}
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if (max_pos > frame_parms->ofdm_symbol_size/2)
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max_pos = max_pos - frame_parms->ofdm_symbol_size;
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return max_pos - sync_pos;
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}
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