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Commit 12f4c55f authored by Guy De Souza's avatar Guy De Souza
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PBCH RE mapping

parent 2ef63f24
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Showing with 67 additions and 33 deletions
openair1/PHY/NR_TRANSPORT/nr_pbch.c
View file @ 12f4c55f
......@@ -37,6 +37,7 @@
//#define DEBUG_PBCH
//#define DEBUG_PBCH_ENCODING
//#define DEBUG_PBCH_DMRS
extern short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT];
......@@ -58,7 +59,7 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
for (int m=0; m<NR_PBCH_DMRS_LENGTH; m++) {
mod_dmrs[m<<1] = nr_mod_table[((NR_MOD_TABLE_BPSK_OFFSET + ((gold_pbch_dmrs[m>>5]&(1<<(m&0x1f)))>>(m&0x1f)))<<1)];
mod_dmrs[(m<<1)+1] = nr_mod_table[((NR_MOD_TABLE_BPSK_OFFSET + ((gold_pbch_dmrs[m>>5]&(1<<(m&0x1f)))>>(m&0x1f)))<<1) + 1];
#ifdef DEBUG_PBCH
#ifdef DEBUG_PBCH_DMRS
printf("m %d mod_dmrs %d %d\n", m, mod_dmrs[2*m], mod_dmrs[2*m+1]);
#endif
}
......@@ -75,7 +76,7 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
l = ssb_start_symbol + 1;
for (int m = 0; m < 60; m++) {
#ifdef DEBUG_PBCH
#ifdef DEBUG_PBCH_DMRS
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
......@@ -91,7 +92,7 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
l++;
for (int m = 60; m < 84; m++) {
#ifdef DEBUG_PBCH
#ifdef DEBUG_PBCH_DMRS
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
......@@ -107,7 +108,7 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
l++;
for (int m = 84; m < NR_PBCH_DMRS_LENGTH; m++) {
#ifdef DEBUG_PBCH
#ifdef DEBUG_PBCH_DMRS
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
......@@ -121,8 +122,8 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
}
#ifdef DEBUG_PBCH
write_output("txdataF.m", "txdataF", txdataF[0], frame_parms->samples_per_frame_wCP>>1, 1, 1);
#ifdef DEBUG_PBCH_DMRS
write_output("txdataF_pbch_dmrs.m", "txdataF_pbch_dmrs", txdataF[0], frame_parms->samples_per_frame_wCP>>1, 1, 1);
#endif
return 0;
}
......@@ -161,7 +162,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
NR_DL_FRAME_PARMS *frame_parms)
{
int m,k,l;
int k,l,ssb_sc_idx;
int16_t a;
int16_t mod_pbch_e[NR_POLAR_PBCH_E<<1];
uint8_t sfn_4lsb, idx=0;
......@@ -182,18 +183,27 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
pbch->pbch_a[NR_PBCH_PDU_BITS+4] = n_hf; // half frame index bit
pbch->pbch_a[NR_PBCH_PDU_BITS+5] = (config->sch_config.ssb_subcarrier_offset.value>>5)&1; //MSB of k0 -- Note the case Lssb=64 is not supported (FR2)
#ifdef DEBUG_PBCH_ENCODING
#endif
// Scrambling
nr_pbch_scrambling((uint32_t)config->sch_config.physical_cell_id.value, pbch->pbch_a, NR_POLAR_PBCH_PAYLOAD_BITS);
#ifdef DEBUG_PBCH_ENCODING
#endif
/// CRC, coding and rate matching
polar_encoder (pbch->pbch_a, pbch->pbch_e, &frame_parms->pbch_polar_params);
#ifdef DEBUG_PBCH_ENCODING
#endif
/// QPSK modulation
for (int i=0; i<NR_POLAR_PBCH_E>>2; i++){
idx = (pbch->pbch_e[i<<2]&1) ^ ((pbch->pbch_e[(i<<2)+1]&1)<<1);
mod_pbch_e[i<<2] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
mod_pbch_e[(i<<2)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1)+1];
for (int i=0; i<NR_POLAR_PBCH_E>>1; i++){
idx = (pbch->pbch_e[i<<1]&1) ^ ((pbch->pbch_e[(i<<1)+1]&1)<<1);
mod_pbch_e[i<<1] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
mod_pbch_e[(i<<1)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1)+1];
#ifdef DEBUG_PBCH
printf("i %d mod_pbch %d %d\n", i, mod_pbch_e[2*i], mod_pbch_e[2*i+1]);
......@@ -201,55 +211,79 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
}
/// Resource mapping
/* a = (config->rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
a = (config->rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
for (int aa = 0; aa < config->rf_config.tx_antenna_ports.value; aa++)
{
// PBCH DMRS are mapped within the SSB block on every fourth subcarrier starting from nushift of symbols 1, 2, 3
///symbol 1 [0+nushift:4:236+nushift] -- 60 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier + nushift;
// PBCH modulated symbols are mapped within the SSB block on symbols 1, 2, 3 excluding the subcarriers used for the PBCH DMRS
///symbol 1 [0:239] -- 180 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier;
l = ssb_start_symbol + 1;
ssb_sc_idx = 0;
for (int m = 0; m < 60; m++) {
for (int m = 0; m < 180; m++) {
#ifdef DEBUG_PBCH
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_dmrs[(m<<1) + 1]) >> 15;
k+=4;
if ((ssb_sc_idx&3) == nushift) { //skip DMRS
k++;
ssb_sc_idx++;
}
else {
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_pbch_e[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_pbch_e[(m<<1) + 1]) >> 15;
k++;
ssb_sc_idx++;
}
if (k >= frame_parms->ofdm_symbol_size)
k-=frame_parms->ofdm_symbol_size;
}
///symbol 2 [0+u:4:44+nushift ; 192+nu:4:236+nushift] -- 24 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier + nushift;
///symbol 2 [0:47 ; 192:239] -- 72 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier;
l++;
ssb_sc_idx = 0;
for (int m = 60; m < 84; m++) {
for (int m = 180; m < 252; m++) {
#ifdef DEBUG_PBCH
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_dmrs[(m<<1) + 1]) >> 15;
k+=(m==71)?148:4; // Jump from 44+nu to 192+nu
if ((ssb_sc_idx&3) == nushift) {
k+=(m==47)?145:1;
ssb_sc_idx+=(m==47)?145:1;
}
else {
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_pbch_e[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_pbch_e[(m<<1) + 1]) >> 15;
k+=(m==47)?145:1;
ssb_sc_idx+=(m==47)?145:1;
}
if (k >= frame_parms->ofdm_symbol_size)
k-=frame_parms->ofdm_symbol_size;
}
///symbol 3 [0+nushift:4:236+nushift] -- 60 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier + nushift;
///symbol 3 [0:239] -- 180 mod symbols
k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier;
l++;
ssb_sc_idx = 0;
for (int m = 84; m < NR_PBCH_DMRS_LENGTH; m++) {
for (int m = 252; m < NR_POLAR_PBCH_E>>1; m++) {
#ifdef DEBUG_PBCH
printf("m %d at k %d of l %d\n", m, k, l);
#endif
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_dmrs[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_dmrs[(m<<1) + 1]) >> 15;
k+=4;
if ((ssb_sc_idx&3) == nushift) {
k++;
ssb_sc_idx++;
}
else {
((int16_t*)txdataF[aa])[(l*frame_parms->ofdm_symbol_size + k)<<1] = (a * mod_pbch_e[m<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1] = (a * mod_pbch_e[(m<<1) + 1]) >> 15;
k++;
ssb_sc_idx++;
}
if (k >= frame_parms->ofdm_symbol_size)
k-=frame_parms->ofdm_symbol_size;
......@@ -259,9 +293,9 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
#ifdef DEBUG_PBCH
write_output("txdataF.m", "txdataF", txdataF[0], frame_parms->samples_per_frame_wCP>>1, 1, 1);
write_output("txdataF_pbch.m", "txdataF_pbch", txdataF[0], frame_parms->samples_per_frame_wCP>>1, 1, 1);
#endif
*/
return 0;
}
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