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srsLTE
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Fix PRACH detection sequence generation for NR

This commit is contained in:
Xavier Arteaga 2021-10-11 15:33:40 +02:00 committed by Andre Puschmann
parent 7ecca61d60
commit 5e1291b0c7
1 changed files with 10 additions and 5 deletions
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15
lib/src/phy/phch/prach.c
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@ -753,11 +753,16 @@ int srsran_prach_gen(srsran_prach_t* p, uint32_t seq_index, uint32_t freq_offset
DEBUG(
"N_zc: %d, N_cp: %d, N_seq: %d, N_ifft_prach=%d begin: %d", p->N_zc, p->N_cp, p->N_seq, p->N_ifft_prach, begin);
// Map dft-precoded sequence to ifft bins
memset(p->ifft_in, 0, begin * sizeof(cf_t));
memcpy(&p->ifft_in[begin], get_precoded_dft(p, seq_index), p->N_zc * sizeof(cf_t));
memset(&p->ifft_in[begin + p->N_zc], 0, (p->N_ifft_prach - begin - p->N_zc) * sizeof(cf_t));
// Fill bottom guard frequency domain with zeros
srsran_vec_cf_zero(p->ifft_in, begin);
// Map dft-precoded sequence to ifft bins
srsran_vec_cf_copy(&p->ifft_in[begin], get_precoded_dft(p, seq_index), p->N_zc);
// Fill top guard frequency domain with zeros
srsran_vec_cf_zero(&p->ifft_in[begin + p->N_zc], p->N_ifft_prach - begin - p->N_zc);
// Generate frequency domain signal
srsran_dft_run(&p->ifft, p->ifft_in, p->ifft_out);
// Copy CP into buffer
@ -977,7 +982,7 @@ int srsran_prach_detect_offset(srsran_prach_t* p,
uint32_t N_rb_ul = srsran_nof_prb(p->N_ifft_ul);
uint32_t k_0 = freq_offset * N_RB_SC - N_rb_ul * N_RB_SC / 2 + p->N_ifft_ul / 2;
uint32_t K = DELTA_F / DELTA_F_RA;
uint32_t begin = PHI + (K * k_0) + (K / 2);
uint32_t begin = PHI + (K * k_0) + (p->is_nr ? 1 : (K / 2));
memcpy(p->prach_bins, &p->signal_fft[begin], p->N_zc * sizeof(cf_t));
int loops = (p->successive_cancellation) ? SUCCESSIVE_CANCELLATION_ITS : 1;