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.
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/**
|
|
* Copyright 2013-2021 Software Radio Systems Limited
|
|
*
|
|
* This file is part of srsRAN.
|
|
*
|
|
* srsRAN 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.
|
|
*
|
|
* srsRAN 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: cfo.h
|
|
*
|
|
* Description: Carrier frequency offset correction using complex exponentials.
|
|
*
|
|
* Reference:
|
|
*****************************************************************************/
|
|
|
|
#ifndef SRSRAN_CFO_H
|
|
#define SRSRAN_CFO_H
|
|
|
|
#include <complex.h>
|
|
|
|
#include "srsran/config.h"
|
|
#include "srsran/phy/common/phy_common.h"
|
|
#include "srsran/phy/utils/cexptab.h"
|
|
|
|
#define SRSRAN_CFO_CEXPTAB_SIZE 4096
|
|
|
|
typedef struct SRSRAN_API {
|
|
float last_freq;
|
|
float tol;
|
|
int nsamples;
|
|
int max_samples;
|
|
srsran_cexptab_t tab;
|
|
cf_t* cur_cexp;
|
|
} srsran_cfo_t;
|
|
|
|
SRSRAN_API int srsran_cfo_init(srsran_cfo_t* h, uint32_t nsamples);
|
|
|
|
SRSRAN_API void srsran_cfo_free(srsran_cfo_t* h);
|
|
|
|
SRSRAN_API int srsran_cfo_resize(srsran_cfo_t* h, uint32_t samples);
|
|
|
|
SRSRAN_API void srsran_cfo_set_tol(srsran_cfo_t* h, float tol);
|
|
|
|
SRSRAN_API void srsran_cfo_correct(srsran_cfo_t* h, const cf_t* input, cf_t* output, float freq);
|
|
|
|
SRSRAN_API void
|
|
srsran_cfo_correct_offset(srsran_cfo_t* h, const cf_t* input, cf_t* output, float freq, int cexp_offset, int nsamples);
|
|
|
|
SRSRAN_API float srsran_cfo_est_corr_cp(cf_t* input_buffer, uint32_t nof_prb);
|
|
|
|
#endif // SRSRAN_CFO_H
|