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.
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/**
|
|
*
|
|
* \section COPYRIGHT
|
|
*
|
|
* Copyright 2013-2015 Software Radio Systems Limited
|
|
*
|
|
* \section LICENSE
|
|
*
|
|
* This file is part of the srsLTE library.
|
|
*
|
|
* 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: cfo.h
|
|
*
|
|
* Description: Carrier frequency offset correction using complex exponentials.
|
|
*
|
|
* Reference:
|
|
*****************************************************************************/
|
|
|
|
#ifndef CFO_
|
|
#define CFO_
|
|
|
|
#include <complex.h>
|
|
|
|
#include "srslte/config.h"
|
|
#include "srslte/phy/utils/cexptab.h"
|
|
|
|
/** If the frequency is changed more than the tolerance, a new table is generated */
|
|
#define SRSLTE_CFO_TOLERANCE 0.00001
|
|
|
|
#define SRSLTE_CFO_CEXPTAB_SIZE 4096
|
|
|
|
typedef struct SRSLTE_API {
|
|
float last_freq;
|
|
float tol;
|
|
int nsamples;
|
|
srslte_cexptab_t tab;
|
|
cf_t *cur_cexp;
|
|
}srslte_cfo_t;
|
|
|
|
SRSLTE_API int srslte_cfo_init(srslte_cfo_t *h,
|
|
uint32_t nsamples);
|
|
|
|
SRSLTE_API void srslte_cfo_free(srslte_cfo_t *h);
|
|
|
|
SRSLTE_API int srslte_cfo_realloc(srslte_cfo_t *h,
|
|
uint32_t samples);
|
|
|
|
SRSLTE_API void srslte_cfo_set_tol(srslte_cfo_t *h,
|
|
float tol);
|
|
|
|
SRSLTE_API void srslte_cfo_correct(srslte_cfo_t *h,
|
|
cf_t *input,
|
|
cf_t *output,
|
|
float freq);
|
|
|
|
#endif // CFO_
|