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openairinterface5g/openair1/PHY/MODULATION/slot_fep.c
T
Lionel Gauthier c60dc45b2b Changed uX, uX_t sX, sX_t to uinX_t 
Cleaned some PDCP/driver code

types parameters and vars

Please see openair2/COMMON/platform_types.h for simple coding rules.

please declare prototypes of functions in .h and include .h files in where the function is used and where it is implemented.



git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5096 818b1a75-f10b-46b9-bf7c-635c3b92a50f
2014-02-28 13:03:10 +00:00

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#include "PHY/defs.h"
#include "MAC_INTERFACE/extern.h"
#include "defs.h"
//#define DEBUG_FEP
#define SOFFSET 0
int slot_fep(PHY_VARS_UE *phy_vars_ue,
unsigned char l,
unsigned char Ns,
int sample_offset,
int no_prefix) {
LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_ue->lte_frame_parms;
LTE_UE_COMMON *ue_common_vars = &phy_vars_ue->lte_ue_common_vars;
uint8_t eNB_id = 0;//ue_common_vars->eNb_id;
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;//,subframe_offset_F;
unsigned int slot_offset;
int i;
unsigned int frame_length_samples = frame_parms->samples_per_tti * 10;
unsigned int rx_offset;
void (*dft)(int16_t *,int16_t *, int);
switch (frame_parms->log2_symbol_size) {
case 7:
dft = dft128;
break;
case 8:
dft = dft256;
break;
case 9:
dft = dft512;
break;
case 10:
dft = dft1024;
break;
case 11:
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);
}
// subframe_offset_F = frame_parms->ofdm_symbol_size * frame_parms->symbols_per_tti * (Ns>>1);
if (l<0 || l>=7-frame_parms->Ncp) {
msg("slot_fep: l must be between 0 and %d\n",7-frame_parms->Ncp);
return(-1);
}
if (Ns<0 || Ns>=20) {
msg("slot_fep: Ns must be between 0 and 19\n");
return(-1);
}
#ifdef DEBUG_FEP
// if (phy_vars_ue->frame <100)
msg("slot_fep: frame %d: slot %d, symbol %d, nb_prefix_samples %d, nb_prefix_samples0 %d, slot_offset %d, subframe_offset %d, sample_offset %d\n", phy_vars_ue->frame,Ns, symbol, nb_prefix_samples,nb_prefix_samples0,slot_offset,subframe_offset,sample_offset);
#endif
for (aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
#ifdef NEW_FFT
memset(&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],0,frame_parms->ofdm_symbol_size*sizeof(int));
#else
memset(&ue_common_vars->rxdataF[aa][2*frame_parms->ofdm_symbol_size*symbol],0,2*frame_parms->ofdm_symbol_size*sizeof(int));
#endif
if (l==0) {
rx_offset = sample_offset + slot_offset + nb_prefix_samples0 + subframe_offset - SOFFSET;
// Align with 128 bit
rx_offset = rx_offset - rx_offset % 4;
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((short *)&ue_common_vars->rxdata[aa][frame_length_samples],
(short *)&ue_common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
#ifndef NEW_FFT
fft((short *)&ue_common_vars->rxdata[aa][(sample_offset +
slot_offset +
nb_prefix_samples0 +
subframe_offset -
SOFFSET) % frame_length_samples],
(short*)&ue_common_vars->rxdataF[aa][2*frame_parms->ofdm_symbol_size*symbol],
frame_parms->twiddle_fft,
frame_parms->rev,
frame_parms->log2_symbol_size,
frame_parms->log2_symbol_size>>1,
0);
#else
start_meas(&phy_vars_ue->rx_dft_stats);
dft((int16_t *)&ue_common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
stop_meas(&phy_vars_ue->rx_dft_stats);
#endif
}
else {
rx_offset = sample_offset + slot_offset +
(frame_parms->ofdm_symbol_size+nb_prefix_samples0+nb_prefix_samples) +
(frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1) + subframe_offset - SOFFSET;
rx_offset = rx_offset - (rx_offset % 4);
if (rx_offset > (frame_length_samples - frame_parms->ofdm_symbol_size))
memcpy((short *)&ue_common_vars->rxdata[aa][frame_length_samples],
(short *)&ue_common_vars->rxdata[aa][0],
frame_parms->ofdm_symbol_size*sizeof(int));
#ifndef NEW_FFT
fft((short *)&ue_common_vars->rxdata[aa][(sample_offset +
slot_offset +
(frame_parms->ofdm_symbol_size+nb_prefix_samples0+nb_prefix_samples) +
(frame_parms->ofdm_symbol_size+nb_prefix_samples)*(l-1) +
subframe_offset-
SOFFSET) % frame_length_samples],
(short*)&ue_common_vars->rxdataF[aa][2*frame_parms->ofdm_symbol_size*symbol],
frame_parms->twiddle_fft,
frame_parms->rev,
frame_parms->log2_symbol_size,
frame_parms->log2_symbol_size>>1,
0);
#else
start_meas(&phy_vars_ue->rx_dft_stats);
dft((int16_t *)&ue_common_vars->rxdata[aa][(rx_offset) % frame_length_samples],
(int16_t *)&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],1);
stop_meas(&phy_vars_ue->rx_dft_stats);
#endif
}
/*
#ifndef NEW_FFT
memcpy(&ue_common_vars->rxdataF2[aa][2*subframe_offset_F+2*frame_parms->ofdm_symbol_size*symbol],
&ue_common_vars->rxdataF[aa][2*frame_parms->ofdm_symbol_size*symbol],
2*frame_parms->ofdm_symbol_size*sizeof(int));
#else
memcpy(&ue_common_vars->rxdataF2[aa][subframe_offset_F+frame_parms->ofdm_symbol_size*symbol],
&ue_common_vars->rxdataF[aa][frame_parms->ofdm_symbol_size*symbol],
frame_parms->ofdm_symbol_size*sizeof(int));
#endif
*/
}
#ifndef PERFECT_CE
if ((l==0) || (l==(4-frame_parms->Ncp))) {
for (aa=0;aa<frame_parms->nb_antennas_tx_eNB;aa++) {
#ifdef DEBUG_FEP
msg("Channel estimation eNB %d, aatx %d, slot %d, symbol %d\n",eNB_id,aa,Ns,l);
#endif
start_meas(&phy_vars_ue->dlsch_channel_estimation_stats);
lte_dl_channel_estimation(phy_vars_ue,eNB_id,0,
Ns,
aa,
l,
symbol);
stop_meas(&phy_vars_ue->dlsch_channel_estimation_stats);
for (i=0;i<phy_vars_ue->PHY_measurements.n_adj_cells;i++) {
lte_dl_channel_estimation(phy_vars_ue,eNB_id,i+1,
Ns,
aa,
l,
symbol);
}
}
// do frequency offset estimation here!
// use channel estimates from current symbol (=ch_t) and last symbol (ch_{t-1})
#ifdef DEBUG_FEP
msg("Frequency offset estimation\n");
#endif
if ((l == 0) || (l==(4-frame_parms->Ncp))) {
start_meas(&phy_vars_ue->dlsch_freq_offset_estimation_stats);
lte_est_freq_offset(ue_common_vars->dl_ch_estimates[0],
frame_parms,
l,
&ue_common_vars->freq_offset);
stop_meas(&phy_vars_ue->dlsch_freq_offset_estimation_stats);
}
}
#endif
#ifdef DEBUG_FEP
msg("slot_fep: done\n");
#endif
return(0);
}
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