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Optimization for unused symbols in NR UE

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After processing TX frequency domain data skip IFFT call for symbols that aren't
used, the time domain buffer is memset instead.
This commit is contained in:
Bartosz Podrygajlo
2025-04-04 11:12:48 +02:00
parent 23c909e28e
commit 0161a1c4fd
13 changed files with 129 additions and 52 deletions
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openair1/PHY/MODULATION/ofdm_mod.c
+43 -19
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@@ -67,31 +67,55 @@ void normal_prefix_mod(int32_t *txdataF,int32_t *txdata,uint8_t nsymb,LTE_DL_FRA
}
void nr_normal_prefix_mod(c16_t *txdataF, c16_t *txdata, uint8_t nsymb, const NR_DL_FRAME_PARMS *frame_parms, uint32_t slot)
void nr_normal_prefix_mod(c16_t *txdataF,
c16_t *txdata,
uint8_t nsymb,
const NR_DL_FRAME_PARMS *frame_parms,
uint32_t slot,
bool was_symbol_used[NR_NUMBER_OF_SYMBOLS_PER_SLOT])
{
// This function works only slot wise. For more generic symbol generation refer nr_feptx0()
if (frame_parms->numerology_index != 0) { // case where numerology != 0
if (!(slot%(frame_parms->slots_per_subframe/2))) {
PHY_ofdm_mod((int *)txdataF,
(int *)txdata,
frame_parms->ofdm_symbol_size,
1,
frame_parms->nb_prefix_samples0,
CYCLIC_PREFIX);
PHY_ofdm_mod((int *)txdataF + frame_parms->ofdm_symbol_size,
(int *)txdata + frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0,
frame_parms->ofdm_symbol_size,
nsymb - 1,
frame_parms->nb_prefix_samples,
CYCLIC_PREFIX);
if (was_symbol_used[0]) {
PHY_ofdm_mod((int *)txdataF,
(int *)txdata,
frame_parms->ofdm_symbol_size,
1,
frame_parms->nb_prefix_samples0,
CYCLIC_PREFIX);
} else {
memset(txdata, 0, (frame_parms->nb_prefix_samples0 + frame_parms->ofdm_symbol_size) * sizeof(c16_t));
}
for (int i = 1; i < nsymb; i++) {
c16_t* tx_data_ptr = txdata + (i - 1) * (frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples) +
frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0;
if (was_symbol_used[i]) {
PHY_ofdm_mod((int *)txdataF + frame_parms->ofdm_symbol_size * i,
(int *)tx_data_ptr,
frame_parms->ofdm_symbol_size,
1,
frame_parms->nb_prefix_samples,
CYCLIC_PREFIX);
} else {
memset(tx_data_ptr, 0, (frame_parms->nb_prefix_samples + frame_parms->ofdm_symbol_size) * sizeof(c16_t));
}
}
}
else {
PHY_ofdm_mod((int *)txdataF,
(int *)txdata,
frame_parms->ofdm_symbol_size,
nsymb,
frame_parms->nb_prefix_samples,
CYCLIC_PREFIX);
for (int i = 0; i < nsymb; i++) {
c16_t* tx_data_ptr = txdata + i * (frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples);
if (was_symbol_used[i]) {
PHY_ofdm_mod((int *)txdataF + frame_parms->ofdm_symbol_size * i,
(int *)tx_data_ptr,
frame_parms->ofdm_symbol_size,
1,
frame_parms->nb_prefix_samples,
CYCLIC_PREFIX);
} else {
memset(tx_data_ptr, 0, (frame_parms->nb_prefix_samples + frame_parms->ofdm_symbol_size) * sizeof(c16_t));
}
}
}
}
else { // numerology = 0, longer CP for every 7th symbol