154 lines
4.8 KiB
C
154 lines
4.8 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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#include "PHY/types.h"
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#include "PHY/defs_eNB.h"
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#include "PHY/phy_extern.h"
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#include "UTIL/LOG/vcd_signal_dumper.h"
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#define DEBUG_PHY
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int lte_est_timing_advance(LTE_DL_FRAME_PARMS *frame_parms,
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LTE_eNB_SRS *lte_eNB_srs,
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unsigned int *eNB_id,
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unsigned char clear,
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unsigned char number_of_cards,
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short coef)
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{
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static int max_pos_fil2 = 0;
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int temp, i, aa, max_pos = 0,ind;
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int max_val=0;
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short Re,Im,ncoef;
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#ifdef DEBUG_PHY
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char fname[100],vname[100];
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#endif
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ncoef = 32768 - coef;
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for (ind=0; ind<number_of_cards; ind++) {
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if (ind==0)
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max_val=0;
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for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
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// do ifft of channel estimate
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switch(frame_parms->N_RB_DL) {
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case 6:
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dft128((int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
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(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
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1);
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break;
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case 25:
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dft512((int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
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(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
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1);
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break;
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case 50:
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dft1024((int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
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(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
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1);
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break;
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case 100:
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dft2048((int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
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(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
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1);
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break;
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}
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#ifdef DEBUG_PHY
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sprintf(fname,"srs_ch_estimates_time_%d%d.m",ind,aa);
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sprintf(vname,"srs_time_%d%d",ind,aa);
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LOG_M(fname,vname,lte_eNB_srs->srs_ch_estimates_time[aa],frame_parms->ofdm_symbol_size*2,2,1);
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#endif
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}
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// we only use channel estimates from tx antenna 0 here
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// remember we fixed the SRS to use only every second subcarriers
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for (i = 0; i < frame_parms->ofdm_symbol_size/2; 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*)lte_eNB_srs->srs_ch_estimates_time[aa])[(i<<1)];
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Im = ((int16_t*)lte_eNB_srs->srs_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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*eNB_id = ind;
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}
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}
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}
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// filter position to reduce jitter
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if (clear == 1)
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max_pos_fil2 = max_pos;
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else
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max_pos_fil2 = ((max_pos_fil2 * coef) + (max_pos * ncoef)) >> 15;
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return(max_pos_fil2);
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}
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int lte_est_timing_advance_pusch(PHY_VARS_eNB* eNB,module_id_t 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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LTE_DL_FRAME_PARMS *frame_parms = &eNB->frame_parms;
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LTE_eNB_PUSCH *eNB_pusch_vars = eNB->pusch_vars[UE_id];
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int32_t **ul_ch_estimates_time= eNB_pusch_vars->drs_ch_estimates_time;
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uint8_t cyclic_shift = 0;
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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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AssertFatal(frame_parms->ofdm_symbol_size > 127,"frame_parms->ofdm_symbol_size %d<128\n",frame_parms->ofdm_symbol_size);
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AssertFatal(frame_parms->nb_antennas_rx >0 && frame_parms->nb_antennas_rx<3,"frame_parms->nb_antennas_rx %d not in [0,1]\n",
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frame_parms->nb_antennas_rx);
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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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//#ifdef DEBUG_PHY
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LOG_D(PHY,"frame %d: max_pos = %d, sync_pos=%d\n",eNB->proc.frame_rx,max_pos,sync_pos);
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//#endif //DEBUG_PHY
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return max_pos - sync_pos;
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}
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