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/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "defs.h"
//#define DEBUG_FEP
int slot_fep_ul(LTE_DL_FRAME_PARMS *frame_parms,
LTE_eNB_COMMON *eNB_common_vars,
unsigned char l,
unsigned char Ns,
unsigned char eNB_id,
int no_prefix)
{
#ifdef DEBUG_FEP
char fname[40], vname[40];
#endif
unsigned char aa;
unsigned char symbol = l+((7-frame_parms->Ncp)*(Ns&1)); ///symbol within sub-frame
unsigned int nb_prefix_samples = (no_prefix ? 0 : frame_parms->nb_prefix_samples);
unsigned int nb_prefix_samples0 = (no_prefix ? 0 : frame_parms->nb_prefix_samples0);
// unsigned int subframe_offset;
unsigned int slot_offset;
void (*dft)(int16_t *,int16_t *, int);
int tmp_dft_in[2048] __attribute__ ((aligned (32))); // This is for misalignment issues for 6 and 15 PRBs
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
unsigned int rx_offset;
switch (frame_parms->ofdm_symbol_size) {
case 128:
dft = dft128;
break;
case 256:
dft = dft256;
break;
case 512:
dft = dft512;
break;
case 1024:
dft = dft1024;
break;
case 1536:
dft = dft1536;
break;
case 2048:
dft = dft2048;
break;
default:
dft = dft512;
break;
}
if (no_prefix) {
// subframe_offset = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
slot_offset = frame_parms->ofdm_symbol_size * (frame_parms->symbols_per_tti>>1) * (Ns%2);
} else {
// subframe_offset = frame_parms->samples_per_tti * (Ns>>1);
slot_offset = (frame_parms->samples_per_tti>>1) * (Ns%2);
}
if (l<0 || l>=7-frame_parms->Ncp) {
LOG_E(PHY,"slot_fep: l must be between 0 and %d\n",7-frame_parms->Ncp);
return(-1);
}
if (Ns<0 || Ns>=20) {
LOG_E(PHY,"slot_fep: Ns must be between 0 and 19\n");
return(-1);
}
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep: Ns %d offset %d, symbol %d, nb_prefix_samples %d\n",Ns,slot_offset,symbol, nb_prefix_samples);
#endif
for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
rx_offset = slot_offset +nb_prefix_samples0;
if (l==0) {
dft( (int16_t *)&eNB_common_vars->rxdata_7_5kHz[eNB_id][aa][rx_offset],
(int16_t *)&eNB_common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],
1
);
} else {
rx_offset += (frame_parms->ofdm_symbol_size+nb_prefix_samples)*l;
if(rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
{
memcpy((void *)&eNB_common_vars->rxdata_7_5kHz[eNB_id][aa][frame_length_samples],
(void *)&eNB_common_vars->rxdata_7_5kHz[eNB_id][aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
}
if( (rx_offset & 7) != 0){
memcpy((void *)&tmp_dft_in,
(void *)&eNB_common_vars->rxdata_7_5kHz[eNB_id][aa][(rx_offset % frame_length_samples)],
frame_parms->ofdm_symbol_size*sizeof(int));
dft( (short *) tmp_dft_in,
(short*) &eNB_common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],
1
);
}
else{
dft( (short *)&eNB_common_vars->rxdata_7_5kHz[eNB_id][aa][rx_offset],
(short*)&eNB_common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],
1
);
}
}
}
#ifdef DEBUG_FEP
LOG_D(PHY,"slot_fep: done\n");
#endif
return(0);
}