146 lines
4.5 KiB
C
146 lines
4.5 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#include "PHY/types.h"
|
|
#include "PHY/defs_eNB.h"
|
|
|
|
#include "common/utils/LOG/vcd_signal_dumper.h"
|
|
|
|
#define DEBUG_PHY
|
|
|
|
int lte_est_timing_advance(LTE_DL_FRAME_PARMS *frame_parms,
|
|
LTE_eNB_SRS *lte_eNB_srs,
|
|
unsigned int *eNB_id,
|
|
unsigned char clear,
|
|
unsigned char number_of_cards,
|
|
short coef)
|
|
|
|
{
|
|
|
|
static int max_pos_fil2 = 0;
|
|
int temp, i, aa, max_pos = 0,ind;
|
|
int max_val=0;
|
|
short Re,Im,ncoef;
|
|
#ifdef DEBUG_PHY
|
|
char fname[100],vname[100];
|
|
#endif
|
|
|
|
ncoef = 32768 - coef;
|
|
|
|
for (ind=0; ind<number_of_cards; ind++) {
|
|
|
|
if (ind==0)
|
|
max_val=0;
|
|
|
|
|
|
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
|
|
// do ifft of channel estimate
|
|
switch(frame_parms->N_RB_DL) {
|
|
case 6:
|
|
dft(DFT_128,(int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
|
|
(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
|
|
1);
|
|
break;
|
|
case 25:
|
|
dft(DFT_512,(int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
|
|
(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
|
|
1);
|
|
break;
|
|
case 50:
|
|
dft(DFT_1024,(int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
|
|
(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
|
|
1);
|
|
break;
|
|
case 100:
|
|
dft(DFT_2048,(int16_t*) <e_eNB_srs->srs_ch_estimates[aa][0],
|
|
(int16_t*) lte_eNB_srs->srs_ch_estimates_time[aa],
|
|
1);
|
|
break;
|
|
}
|
|
#ifdef DEBUG_PHY
|
|
sprintf(fname,"srs_ch_estimates_time_%d%d.m",ind,aa);
|
|
sprintf(vname,"srs_time_%d%d",ind,aa);
|
|
LOG_M(fname,vname,lte_eNB_srs->srs_ch_estimates_time[aa],frame_parms->ofdm_symbol_size*2,2,1);
|
|
#endif
|
|
}
|
|
|
|
// we only use channel estimates from tx antenna 0 here
|
|
// remember we fixed the SRS to use only every second subcarriers
|
|
for (i = 0; i < frame_parms->ofdm_symbol_size/2; i++) {
|
|
temp = 0;
|
|
|
|
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
|
|
Re = ((int16_t*)lte_eNB_srs->srs_ch_estimates_time[aa])[(i<<1)];
|
|
Im = ((int16_t*)lte_eNB_srs->srs_ch_estimates_time[aa])[1+(i<<1)];
|
|
temp += (Re*Re/2) + (Im*Im/2);
|
|
}
|
|
|
|
if (temp > max_val) {
|
|
max_pos = i;
|
|
max_val = temp;
|
|
*eNB_id = ind;
|
|
}
|
|
}
|
|
}
|
|
|
|
// filter position to reduce jitter
|
|
if (clear == 1)
|
|
max_pos_fil2 = max_pos;
|
|
else
|
|
max_pos_fil2 = ((max_pos_fil2 * coef) + (max_pos * ncoef)) >> 15;
|
|
|
|
return(max_pos_fil2);
|
|
}
|
|
|
|
|
|
int lte_est_timing_advance_pusch(LTE_DL_FRAME_PARMS *frame_parms,
|
|
int32_t **ul_ch_estimates_time)
|
|
{
|
|
int temp, i, aa, max_pos=0, max_val=0;
|
|
short Re,Im;
|
|
|
|
// uint8_t cyclic_shift = 0;
|
|
int sync_pos = 0;//(frame_parms->ofdm_symbol_size-cyclic_shift*frame_parms->ofdm_symbol_size/12)%(frame_parms->ofdm_symbol_size);
|
|
|
|
AssertFatal(frame_parms->ofdm_symbol_size > 127,"frame_parms->ofdm_symbol_size %d<128\n",frame_parms->ofdm_symbol_size);
|
|
AssertFatal(frame_parms->nb_antennas_rx >0 && frame_parms->nb_antennas_rx<3,"frame_parms->nb_antennas_rx %d not in [0,1]\n",
|
|
frame_parms->nb_antennas_rx);
|
|
for (i = 0; i < frame_parms->ofdm_symbol_size; i++) {
|
|
temp = 0;
|
|
|
|
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
|
|
Re = ((int16_t*)ul_ch_estimates_time[aa])[(i<<1)];
|
|
Im = ((int16_t*)ul_ch_estimates_time[aa])[1+(i<<1)];
|
|
temp += (Re*Re/2) + (Im*Im/2);
|
|
}
|
|
|
|
if (temp > max_val) {
|
|
max_pos = i;
|
|
max_val = temp;
|
|
}
|
|
}
|
|
|
|
if (max_pos>frame_parms->ofdm_symbol_size/2)
|
|
max_pos = max_pos-frame_parms->ofdm_symbol_size;
|
|
|
|
return max_pos - sync_pos;
|
|
}
|