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srsLTE
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Added UE UL NR frequency offset option

This commit is contained in:
Xavier Arteaga 2021-08-24 10:00:36 +02:00 committed by Xavier Arteaga
parent cfe2b305a1
commit 7da2d20447
2 changed files with 34 additions and 0 deletions
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4
lib/include/srsran/phy/ue/ue_ul_nr.h
View File

@ -48,12 +48,16 @@ typedef struct SRSRAN_API {
srsran_pusch_nr_t pusch;
srsran_pucch_nr_t pucch;
srsran_dmrs_sch_t dmrs;
float freq_offset_hz;
} srsran_ue_ul_nr_t;
SRSRAN_API int srsran_ue_ul_nr_init(srsran_ue_ul_nr_t* q, cf_t* output, const srsran_ue_ul_nr_args_t* args);
SRSRAN_API int srsran_ue_ul_nr_set_carrier(srsran_ue_ul_nr_t* q, const srsran_carrier_nr_t* carrier);
SRSRAN_API void srsran_ue_ul_nr_set_freq_offset(srsran_ue_ul_nr_t* q, float freq_offset_hz);
SRSRAN_API int srsran_ue_ul_nr_encode_pusch(srsran_ue_ul_nr_t* q,
const srsran_slot_cfg_t* slot_cfg,
const srsran_sch_cfg_nr_t* pusch_cfg,

30
lib/src/phy/ue/ue_ul_nr.c
View File

@ -95,6 +95,15 @@ int srsran_ue_ul_nr_set_carrier(srsran_ue_ul_nr_t* q, const srsran_carrier_nr_t*
return SRSRAN_SUCCESS;
}
void srsran_ue_ul_nr_set_freq_offset(srsran_ue_ul_nr_t* q, float freq_offset_hz)
{
if (q == NULL) {
return;
}
q->freq_offset_hz = freq_offset_hz;
}
int srsran_ue_ul_nr_encode_pusch(srsran_ue_ul_nr_t* q,
const srsran_slot_cfg_t* slot_cfg,
const srsran_sch_cfg_nr_t* pusch_cfg,
@ -130,6 +139,12 @@ int srsran_ue_ul_nr_encode_pusch(srsran_ue_ul_nr_t* q,
srsran_vec_sc_prod_cfc(q->ifft.cfg.out_buffer, 0.99f / max_peak, q->ifft.cfg.out_buffer, q->ifft.sf_sz);
}
// Apply frequency offset
if (isnormal(q->freq_offset_hz)) {
srsran_vec_apply_cfo(
q->ifft.cfg.out_buffer, -q->freq_offset_hz / (1000.0f * q->ifft.sf_sz), q->ifft.cfg.out_buffer, q->ifft.sf_sz);
}
return SRSRAN_SUCCESS;
}
@ -219,6 +234,19 @@ int srsran_ue_ul_nr_encode_pucch(srsran_ue_ul_nr_t* q,
// Generate signal
srsran_ofdm_tx_sf(&q->ifft);
// Normalise to peak
uint32_t max_idx = srsran_vec_max_abs_ci(q->ifft.cfg.out_buffer, q->ifft.sf_sz);
float max_peak = cabsf(q->ifft.cfg.out_buffer[max_idx]);
if (isnormal(max_peak)) {
srsran_vec_sc_prod_cfc(q->ifft.cfg.out_buffer, 0.99f / max_peak, q->ifft.cfg.out_buffer, q->ifft.sf_sz);
}
// Apply frequency offset
if (isnormal(q->freq_offset_hz)) {
srsran_vec_apply_cfo(
q->ifft.cfg.out_buffer, -q->freq_offset_hz / (1000.0f * q->ifft.sf_sz), q->ifft.cfg.out_buffer, q->ifft.sf_sz);
}
return SRSRAN_SUCCESS;
}
@ -249,6 +277,8 @@ int srsran_ue_ul_nr_pusch_info(const srsran_ue_ul_nr_t* q,
// Append PDSCH info
len += srsran_pusch_nr_tx_info(&q->pusch, cfg, &cfg->grant, uci_value, &str[len], str_len - len);
len = srsran_print_check(str, str_len, len, " cfo=%.0f", q->freq_offset_hz);
return len;
}