mirror of https://github.com/PentHertz/srsLTE.git
Fix PRACH detection sequence generation for NR
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@ -753,11 +753,16 @@ int srsran_prach_gen(srsran_prach_t* p, uint32_t seq_index, uint32_t freq_offset
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DEBUG(
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"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);
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// Map dft-precoded sequence to ifft bins
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memset(p->ifft_in, 0, begin * sizeof(cf_t));
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memcpy(&p->ifft_in[begin], get_precoded_dft(p, seq_index), p->N_zc * sizeof(cf_t));
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memset(&p->ifft_in[begin + p->N_zc], 0, (p->N_ifft_prach - begin - p->N_zc) * sizeof(cf_t));
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// Fill bottom guard frequency domain with zeros
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srsran_vec_cf_zero(p->ifft_in, begin);
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// Map dft-precoded sequence to ifft bins
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srsran_vec_cf_copy(&p->ifft_in[begin], get_precoded_dft(p, seq_index), p->N_zc);
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// Fill top guard frequency domain with zeros
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srsran_vec_cf_zero(&p->ifft_in[begin + p->N_zc], p->N_ifft_prach - begin - p->N_zc);
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// Generate frequency domain signal
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srsran_dft_run(&p->ifft, p->ifft_in, p->ifft_out);
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// Copy CP into buffer
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@ -977,7 +982,7 @@ int srsran_prach_detect_offset(srsran_prach_t* p,
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uint32_t N_rb_ul = srsran_nof_prb(p->N_ifft_ul);
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uint32_t k_0 = freq_offset * N_RB_SC - N_rb_ul * N_RB_SC / 2 + p->N_ifft_ul / 2;
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uint32_t K = DELTA_F / DELTA_F_RA;
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uint32_t begin = PHI + (K * k_0) + (K / 2);
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uint32_t begin = PHI + (K * k_0) + (p->is_nr ? 1 : (K / 2));
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memcpy(p->prach_bins, &p->signal_fft[begin], p->N_zc * sizeof(cf_t));
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int loops = (p->successive_cancellation) ? SUCCESSIVE_CANCELLATION_ITS : 1;
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