178 lines
5.8 KiB
C
178 lines
5.8 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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/******************************************************************************
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* File: prach.h
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*
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* Description: Physical random access channel.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 5.7
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*****************************************************************************/
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#ifndef PRACH_
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#define PRACH_
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#include <stdint.h>
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#include <stdlib.h>
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#include <complex.h>
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#include <stdbool.h>
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#include "srslte/config.h"
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#include "srslte/phy/dft/dft.h"
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#include "srslte/phy/common/phy_common.h"
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#define SRSLTE_PRACH_MAX_LEN (2*24576+21024) // Maximum Tcp + Tseq
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/** Generation and detection of RACH signals for uplink.
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* Currently only supports preamble formats 0-3.
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* Does not currently support high speed flag.
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* Based on 3GPP TS 36.211 version 10.7.0 Release 10.
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*/
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typedef struct SRSLTE_API {
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// Parameters from higher layers (extracted from SIB2)
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uint32_t config_idx;
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uint32_t f; // preamble format
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uint32_t rsi; // rootSequenceIndex
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bool hs; // highSpeedFlag
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uint32_t zczc; // zeroCorrelationZoneConfig
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uint32_t N_ifft_ul; // IFFT size for uplink
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uint32_t N_ifft_prach; // IFFT size for PRACH generation
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uint32_t max_N_ifft_ul;
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// Working parameters
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uint32_t N_zc; // PRACH sequence length
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uint32_t N_cs; // Cyclic shift size
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uint32_t N_seq; // Preamble length
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float T_seq; // Preamble length in seconds
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float T_tot; // Total sequence length in seconds
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uint32_t N_cp; // Cyclic prefix length
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// Generated tables
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cf_t seqs[64][839]; // Our set of 64 preamble sequences
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cf_t dft_seqs[64][839]; // DFT-precoded seqs
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uint32_t root_seqs_idx[64]; // Indices of root seqs in seqs table
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uint32_t N_roots; // Number of root sequences used in this configuration
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// Containers
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cf_t *ifft_in;
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cf_t *ifft_out;
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cf_t *prach_bins;
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cf_t *corr_spec;
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float *corr;
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// PRACH IFFT
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srslte_dft_plan_t fft;
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srslte_dft_plan_t ifft;
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// ZC-sequence FFT and IFFT
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srslte_dft_plan_t zc_fft;
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srslte_dft_plan_t zc_ifft;
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cf_t *signal_fft;
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float detect_factor;
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uint32_t deadzone;
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float peak_values[65];
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uint32_t peak_offsets[65];
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} srslte_prach_t;
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typedef struct SRSLTE_API {
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int nof_sf;
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uint32_t sf[5];
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} srslte_prach_sf_config_t;
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typedef enum SRSLTE_API {
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SRSLTE_PRACH_SFN_EVEN = 0,
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SRSLTE_PRACH_SFN_ANY,
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} srslte_prach_sfn_t;
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typedef struct {
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uint32_t config_idx;
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uint32_t root_seq_idx;
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uint32_t zero_corr_zone;
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uint32_t freq_offset;
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bool hs_flag;
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} srslte_prach_cfg_t;
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SRSLTE_API uint32_t srslte_prach_get_preamble_format(uint32_t config_idx);
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SRSLTE_API srslte_prach_sfn_t srslte_prach_get_sfn(uint32_t config_idx);
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SRSLTE_API bool srslte_prach_tti_opportunity(srslte_prach_t *p,
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uint32_t current_tti,
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int allowed_subframe);
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SRSLTE_API void srslte_prach_sf_config(uint32_t config_idx,
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srslte_prach_sf_config_t *sf_config);
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SRSLTE_API int srslte_prach_init(srslte_prach_t *p,
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uint32_t max_N_ifft_ul);
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SRSLTE_API int srslte_prach_set_cell(srslte_prach_t *p,
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uint32_t N_ifft_ul,
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uint32_t config_idx,
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uint32_t root_seq_index,
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bool high_speed_flag,
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uint32_t zero_corr_zone_config);
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SRSLTE_API int srslte_prach_init_cfg(srslte_prach_t* p,
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srslte_prach_cfg_t* cfg,
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uint32_t nof_prb);
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SRSLTE_API int srslte_prach_gen(srslte_prach_t *p,
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uint32_t seq_index,
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uint32_t freq_offset,
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cf_t *signal);
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SRSLTE_API int srslte_prach_detect(srslte_prach_t *p,
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uint32_t freq_offset,
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cf_t *signal,
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uint32_t sig_len,
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uint32_t *indices,
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uint32_t *ind_len);
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SRSLTE_API int srslte_prach_detect_offset(srslte_prach_t *p,
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uint32_t freq_offset,
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cf_t *signal,
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uint32_t sig_len,
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uint32_t *indices,
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float *t_offsets,
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float *peak_to_avg,
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uint32_t *ind_len);
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SRSLTE_API void srslte_prach_set_detect_factor(srslte_prach_t *p,
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float factor);
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SRSLTE_API int srslte_prach_free(srslte_prach_t *p);
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SRSLTE_API int srslte_prach_print_seqs(srslte_prach_t *p);
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#endif // PRACH_
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