mirror of https://github.com/pvnis/srsRAN_4G.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
5.4 KiB
C
117 lines
5.4 KiB
C
/**
|
|
* Copyright 2013-2021 Software Radio Systems Limited
|
|
*
|
|
* This file is part of srsLTE.
|
|
*
|
|
* srsLTE is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* srsLTE is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* A copy of the GNU Affero General Public License can be found in
|
|
* the LICENSE file in the top-level directory of this distribution
|
|
* and at http://www.gnu.org/licenses/.
|
|
*
|
|
*/
|
|
|
|
/******************************************************************************
|
|
* File: nsss.h
|
|
*
|
|
* Description: Narrowband secondary synchronization signal (NSSS)
|
|
* generation and detection.
|
|
*
|
|
*
|
|
* Reference: 3GPP TS 36.211 version 13.2.0 Release 13 Sec. 10.2.7.2
|
|
*****************************************************************************/
|
|
|
|
#ifndef SRSLTE_NSSS_H
|
|
#define SRSLTE_NSSS_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "srslte/config.h"
|
|
#include "srslte/phy/common/phy_common.h"
|
|
#include "srslte/phy/dft/dft.h"
|
|
#include "srslte/phy/utils/convolution.h"
|
|
|
|
#define SRSLTE_NSSS_NSYMB 11
|
|
#define SRSLTE_NSSS_NSC 12
|
|
#define SRSLTE_NSSS_LEN (SRSLTE_NSSS_NSYMB * SRSLTE_NSSS_NSC)
|
|
#define SRSLTE_NSSS_NUM_SEQ 4
|
|
#define SRSLTE_NSSS_TOT_LEN (SRSLTE_NSSS_NUM_SEQ * SRSLTE_NSSS_LEN)
|
|
|
|
#define SRSLTE_NSSS_CORR_FILTER_LEN 1508
|
|
#define SRSLTE_NSSS_CORR_OFFSET 412
|
|
|
|
#define SRSLTE_NSSS_PERIOD 2
|
|
#define SRSLTE_NSSS_NUM_SF_DETECT (SRSLTE_NSSS_PERIOD)
|
|
|
|
// b_q_m table from 3GPP TS 36.211 v13.2.0 table 10.2.7.2.1-1
|
|
static const int b_q_m[SRSLTE_NSSS_NUM_SEQ][128] = {
|
|
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
|
|
1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
|
|
1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
|
|
1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1},
|
|
{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1,
|
|
-1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1,
|
|
-1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1,
|
|
-1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1,
|
|
1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1},
|
|
{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1,
|
|
-1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1,
|
|
-1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1,
|
|
1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
|
|
-1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1}};
|
|
|
|
/* Low-level API */
|
|
typedef struct SRSLTE_API {
|
|
uint32_t input_size;
|
|
uint32_t subframe_sz;
|
|
uint32_t fft_size, max_fft_size;
|
|
srslte_conv_fft_cc_t conv_fft;
|
|
|
|
cf_t* nsss_signal_time[SRSLTE_NUM_PCI];
|
|
cf_t* tmp_input;
|
|
cf_t* conv_output;
|
|
float* conv_output_abs;
|
|
float peak_values[SRSLTE_NUM_PCI];
|
|
float corr_peak_threshold;
|
|
} srslte_nsss_synch_t;
|
|
|
|
SRSLTE_API int srslte_nsss_synch_init(srslte_nsss_synch_t* q, uint32_t input_size, uint32_t fft_size);
|
|
|
|
SRSLTE_API void srslte_nsss_synch_free(srslte_nsss_synch_t* q);
|
|
|
|
SRSLTE_API int srslte_nsss_synch_resize(srslte_nsss_synch_t* q, uint32_t fft_size);
|
|
|
|
SRSLTE_API int srslte_nsss_sync_find(srslte_nsss_synch_t* q,
|
|
cf_t* input,
|
|
float* corr_peak_value,
|
|
uint32_t* cell_id,
|
|
uint32_t* sfn_partial);
|
|
|
|
void srslte_nsss_sync_find_pci(srslte_nsss_synch_t* q, cf_t* input, uint32_t cell_id);
|
|
|
|
SRSLTE_API int srslte_nsss_corr_init(srslte_nsss_synch_t* q);
|
|
|
|
SRSLTE_API void srslte_nsss_generate(cf_t* signal, uint32_t cell_id);
|
|
|
|
SRSLTE_API void srslte_nsss_put_subframe(srslte_nsss_synch_t* q,
|
|
cf_t* nsss,
|
|
cf_t* subframe,
|
|
const int nf,
|
|
const uint32_t nof_prb,
|
|
const uint32_t nbiot_prb_offset);
|
|
|
|
#endif // SRSLTE_NSSS_H
|