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srsLTE
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Offset FFT window for UE DL NR

This commit is contained in:
Xavier Arteaga 2021-04-09 18:21:28 +02:00 committed by Andre Puschmann
parent f799ab6f94
commit c84e73541d
1 changed files with 9 additions and 0 deletions
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9
lib/src/phy/ue/ue_dl_nr.c
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@ -16,6 +16,13 @@
#define UE_DL_NR_PDCCH_CORR_DEFAULT_THR 0.5f
#define UE_DL_NR_PDCCH_EPRE_DEFAULT_THR -80.0f
/**
* @brief Shifts FFT window a fraction of the cyclic prefix. Set to 0.0f for disabling.
* @note Increases protection against inter-symbol interference in case of synchronization error in expense of computing
* performance
*/
#define UE_DL_NR_FFT_WINDOW_OFFSET 0.5f
static int ue_dl_nr_alloc_prb(srsran_ue_dl_nr_t* q, uint32_t new_nof_prb)
{
if (q->max_prb < new_nof_prb) {
@ -82,6 +89,7 @@ int srsran_ue_dl_nr_init(srsran_ue_dl_nr_t* q, cf_t* input[SRSRAN_MAX_PORTS], co
fft_cfg.nof_prb = args->nof_max_prb;
fft_cfg.symbol_sz = srsran_symbol_sz(args->nof_max_prb);
fft_cfg.keep_dc = true;
fft_cfg.rx_window_offset = UE_DL_NR_FFT_WINDOW_OFFSET;
for (uint32_t i = 0; i < q->nof_rx_antennas; i++) {
fft_cfg.in_buffer = input[i];
@ -156,6 +164,7 @@ int srsran_ue_dl_nr_set_carrier(srsran_ue_dl_nr_t* q, const srsran_carrier_nr_t*
cfg.symbol_sz = srsran_min_symbol_sz_rb(carrier->nof_prb);
cfg.cp = SRSRAN_CP_NORM;
cfg.keep_dc = true;
cfg.rx_window_offset = UE_DL_NR_FFT_WINDOW_OFFSET;
srsran_ofdm_rx_init_cfg(&q->fft[i], &cfg);
}
}