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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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/******************************************************************************
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* File: cfo.h
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*
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* Description: Carrier frequency offset correction using complex exponentials.
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*
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* Reference:
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*****************************************************************************/
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#ifndef SRSLTE_CFO_H
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#define SRSLTE_CFO_H
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#include <complex.h>
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#include "srslte/config.h"
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#include "srslte/phy/utils/cexptab.h"
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#include "srslte/phy/common/phy_common.h"
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#define SRSLTE_CFO_CEXPTAB_SIZE 4096
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typedef struct SRSLTE_API {
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float last_freq;
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float tol;
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int nsamples;
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int max_samples;
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srslte_cexptab_t tab;
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cf_t* cur_cexp;
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} srslte_cfo_t;
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SRSLTE_API int srslte_cfo_init(srslte_cfo_t* h, uint32_t nsamples);
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SRSLTE_API void srslte_cfo_free(srslte_cfo_t* h);
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SRSLTE_API int srslte_cfo_resize(srslte_cfo_t* h, uint32_t samples);
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SRSLTE_API void srslte_cfo_set_tol(srslte_cfo_t* h, float tol);
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SRSLTE_API void srslte_cfo_correct(srslte_cfo_t* h, const cf_t* input, cf_t* output, float freq);
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SRSLTE_API void
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srslte_cfo_correct_offset(srslte_cfo_t* h, const cf_t* input, cf_t* output, float freq, int cexp_offset, int nsamples);
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SRSLTE_API float srslte_cfo_est_corr_cp(cf_t* input_buffer, uint32_t nof_prb);
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#endif // SRSLTE_CFO_H
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