srsRAN_4G/lib/include/srsran/phy/ch_estimation/chest_common.h

/**
 * 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/.
 *
 */

#ifndef SRSRAN_CHEST_COMMON_H
#define SRSRAN_CHEST_COMMON_H

#include "srsran/config.h"
#include <stdint.h>

#define SRSRAN_CHEST_MAX_SMOOTH_FIL_LEN 64

typedef enum SRSRAN_API {
  SRSRAN_CHEST_FILTER_GAUSS = 0,
  SRSRAN_CHEST_FILTER_TRIANGLE,
  SRSRAN_CHEST_FILTER_NONE
} srsran_chest_filter_t;

SRSRAN_API void srsran_chest_average_pilots(cf_t*    input,
                                            cf_t*    output,
                                            float*   filter,
                                            uint32_t nof_ref,
                                            uint32_t nof_symbols,
                                            uint32_t filter_len);

SRSRAN_API uint32_t srsran_chest_set_smooth_filter3_coeff(float* smooth_filter, float w);

SRSRAN_API float srsran_chest_estimate_noise_pilots(cf_t* noisy, cf_t* noiseless, cf_t* noise_vec, uint32_t nof_pilots);

SRSRAN_API uint32_t srsran_chest_set_triangle_filter(float* fil, int filter_len);

SRSRAN_API uint32_t srsran_chest_set_smooth_filter_gauss(float* filter, uint32_t order, float std_dev);

#endif // SRSRAN_CHEST_COMMON_H