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