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fembms: FeMBMS (eNB) Top-level routines for generating the PDSCH physical channel from 36-211 V14.1

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Signed-off-by: Javier Morgade <javier.morgade@ieee.org>
This commit is contained in:
Javier Morgade
2020-07-20 10:51:51 +02:00
parent 4923ba301a
commit 3d11b3d65d
1 changed files with 259 additions and 2 deletions
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openair1/PHY/LTE_TRANSPORT/dlsch_modulation.c
+259 -2
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@@ -20,12 +20,12 @@
*/
/*! \file PHY/LTE_TRANSPORT/dlsch_modulation.c
* \brief Top-level routines for generating the PDSCH physical channel from 36-211, V8.6 2009-03
* \brief Top-level routines for generating the PDSCH physical channel from 36-211, V8.6 2009-03, V14.1 2017 (FeMBMS)
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr
* \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr, javier.morgade@ieee.irg
* \note
* \warning
*/
@@ -2910,3 +2910,260 @@ int mch_modulation(int32_t **txdataF,
return (re_allocated);
}
int allocate_REs_in_RB_MCH_khz_1dot25(int32_t **txdataF,
uint32_t *jj,
uint16_t re_offset,
uint32_t symbol_offset,
uint8_t *x0,
uint8_t subframe,
uint8_t mod_order,
int16_t amp,
int16_t *qam_table_s,
uint32_t *re_allocated,
uint8_t skip_dc,
LTE_DL_FRAME_PARMS *frame_parms)
{
uint32_t tti_offset;
uint8_t re,offset;
uint8_t qam64_table_offset_re = 0;
uint8_t qam64_table_offset_im = 0;
uint8_t qam16_table_offset_re = 0;
uint8_t qam16_table_offset_im = 0;
int16_t gain_lin_QPSK;//,gain_lin_16QAM1,gain_lin_16QAM2;
int16_t re_off=re_offset;
gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
uint8_t first_re,last_re;
int inc;
#ifdef DEBUG_DLSCH_MODULATION
LOG_I(PHY,"allocate_re_MCH khz_1dot25 (mod %d): symbol_offset %d re_offset %d (%d), jj %d -> %d,%d, gain_lin_QPSK %d,txdataF %p\n",mod_order,symbol_offset,re_offset,skip_dc,*jj, x0[*jj], x0[1+*jj],gain_lin_QPSK,&txdataF[0][symbol_offset]);
#endif
/*last_re=12;
first_re=0;
inc=1;
if ((l==2)||(l==10)) {
inc=2;
first_re=1;
} else if (l==6) {
inc=2;
}*/
last_re=144; //12*12
if ((subframe&0x1)==0){ // n_sf mod 2 == 0: even
first_re=1;
offset=0;
}else{
first_re=0;
offset=3;
}
inc=1;
for (re=first_re; re<last_re; re+=inc) {
if( ((re-offset)%6) == 0 )
continue; //pilot
//if ((subframe&0x1)==0) // n_sf mod 2 == 0: even
//k = 6*m;
//else
//k = 6*m + 3;
//if ((skip_dc == 1) && (re==(6+first_re)))
if ((skip_dc == 1) && (re==(72+first_re))){
re_off=re_off - frame_parms->ofdm_symbol_size_khz_1dot25+1;
}
tti_offset = symbol_offset + re_off + re;
//LOG_I(PHY,"re %d (jj %d)\n",re,*jj);
*re_allocated = *re_allocated + 1;
switch (mod_order) {
case 2: //QPSK
LOG_D(PHY,"%d : %d,%d => ",tti_offset,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
((int16_t*)&txdataF[0][tti_offset])[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //I //b_i
*jj = *jj + 1;
((int16_t*)&txdataF[0][tti_offset])[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //Q //b_{i+1}
*jj = *jj + 1;
LOG_D(PHY,"subframe%d alloc[%d][%d][%d](%d,%d)\n",subframe,tti_offset,symbol_offset,tti_offset-symbol_offset,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
break;
case 4: //16QAM
qam16_table_offset_re = 0;
qam16_table_offset_im = 0;
if (x0[*jj] == 1)
qam16_table_offset_re+=2;
*jj=*jj+1;
if (x0[*jj] == 1)
qam16_table_offset_im+=2;
*jj=*jj+1;
if (x0[*jj] == 1)
qam16_table_offset_re+=1;
*jj=*jj+1;
if (x0[*jj] == 1)
qam16_table_offset_im+=1;
*jj=*jj+1;
((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s[qam16_table_offset_re];//(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s[qam16_table_offset_im];//(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
break;
case 6: //64QAM
qam64_table_offset_re = 0;
qam64_table_offset_im = 0;
if (x0[*jj] == 1)
qam64_table_offset_re+=4;
*jj=*jj+1;
if (x0[*jj] == 1)
qam64_table_offset_im+=4;
*jj=*jj+1;
if (x0[*jj] == 1)
qam64_table_offset_re+=2;
*jj=*jj+1;
if (x0[*jj] == 1)
qam64_table_offset_im+=2;
*jj=*jj+1;
if (x0[*jj] == 1)
qam64_table_offset_re+=1;
*jj=*jj+1;
if (x0[*jj] == 1)
qam64_table_offset_im+=1;
*jj=*jj+1;
((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s[qam64_table_offset_re];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s[qam64_table_offset_im];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
break;
}
}
return(0);
}
int mch_modulation_khz_1dot25(int32_t **txdataF,
int16_t amp,
uint32_t subframe_offset,
LTE_DL_FRAME_PARMS *frame_parms,
LTE_eNB_DLSCH_t *dlsch)
{
uint8_t nsymb,nsymb_pmch;
uint32_t i,jj,re_allocated,symbol_offset;
uint16_t l,rb,re_offset;
uint8_t skip_dc=0;
uint8_t mod_order = dlsch->harq_processes[0]->Qm;
int16_t qam16_table_a[4],qam64_table_a[8];//,qam16_table_b[4],qam64_table_b[8];
int16_t *qam_table_s;
nsymb_pmch = 1;
nsymb = (frame_parms->Ncp == NORMAL) ? 14 : 12;
if (mod_order == 4)
for (i=0; i<4; i++) {
qam16_table_a[i] = (int16_t)(((int32_t)qam16_table[i]*amp)>>15);
}
else if (mod_order == 6)
for (i=0; i<8; i++) {
qam64_table_a[i] = (int16_t)(((int32_t)qam64_table[i]*amp)>>15);
}
jj=0;
re_allocated=0;
// LOG_I(PHY,"num_pdcch_symbols %d, nsymb %d\n",num_pdcch_symbols,nsymb);
for (l=0; l<nsymb_pmch; l++) {
#ifdef DEBUG_DLSCH_MODULATION
LOG_I(PHY,"Generating khz_1dot25 MCH (mod %d) in subframe %d for symbol %d\n",mod_order, subframe_offset,l);
#endif
re_offset = frame_parms->first_carrier_offset_khz_1dot25;
symbol_offset = (uint32_t)frame_parms->ofdm_symbol_size*(l+(subframe_offset*nsymb));
for (rb=0; rb<frame_parms->N_RB_DL; rb++) {
if ((frame_parms->N_RB_DL&1) == 1) { // ODD N_RB_DL
if (rb==(frame_parms->N_RB_DL>>1))
skip_dc = 1;
else
skip_dc = 0;
}
if (mod_order == 4)
qam_table_s = qam16_table_a;
else if (mod_order == 6)
qam_table_s = qam64_table_a;
else
qam_table_s = NULL;
//LOG_I(PHY,"Allocated rb %d, subframe_offset %d,amp %d\n",rb,subframe_offset,amp);
allocate_REs_in_RB_MCH_khz_1dot25(txdataF,
&jj,
re_offset,
symbol_offset,
dlsch->harq_processes[0]->eDL,
subframe_offset,
mod_order,
amp,
qam_table_s,
&re_allocated,
skip_dc,
frame_parms);
re_offset+=144; // go to next RB 12*12
// check if we crossed the symbol boundary and skip DC
if (re_offset >= frame_parms->ofdm_symbol_size_khz_1dot25) {
if (skip_dc == 0) //even number of RBs (doesn't straddle DC)
re_offset=1;
else
re_offset=73; // odd number of RBs
}
}
}
#ifdef DEBUG_DLSCH_MODULATION
LOG_I(PHY,"generate_dlsch(MCH) : jj = %d,re_allocated = %d (G %d)\n",jj,re_allocated,get_G(frame_parms,dlsch->harq_processes[0]->nb_rb,dlsch->harq_processes[0]->rb_alloc,mod_order,1,2,0,subframe_offset,1/*transmission mode*/));
LOG_I(PHY,"generate_dlsch(MCH) : jj = %d,re_allocated = %d\n",jj,re_allocated);
#endif
return (re_allocated);
}