146 lines
4.6 KiB
C
146 lines
4.6 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 1.0 (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/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&1);
|
|
} else {
|
|
// subframe_offset = frame_parms->samples_per_tti * (Ns>>1);
|
|
slot_offset = (frame_parms->samples_per_tti>>1) * (Ns&1);
|
|
}
|
|
|
|
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;
|
|
/* should never happen for eNB
|
|
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));
|
|
}
|
|
*/
|
|
|
|
// check for 256-bit alignment of input buffer and do DFT directly, else do via intermediate buffer
|
|
if( (rx_offset & 15) != 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);
|
|
}
|