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