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.
145 lines
5.5 KiB
C
145 lines
5.5 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/.
|
|
*
|
|
*/
|
|
|
|
#ifndef SRSRAN_OFDM_H
|
|
#define SRSRAN_OFDM_H
|
|
|
|
/**********************************************************************************************
|
|
* File: ofdm.h
|
|
*
|
|
* Description: OFDM modulation object.
|
|
* Used in generation of downlink OFDM signals.
|
|
*
|
|
* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6
|
|
*********************************************************************************************/
|
|
|
|
#include <strings.h>
|
|
|
|
#include "srsran/config.h"
|
|
#include "srsran/phy/common/phy_common.h"
|
|
#include "srsran/phy/dft/dft.h"
|
|
|
|
/**
|
|
* @struct srsran_ofdm_cfg_t
|
|
* Contains the generic OFDM modulator configuration. The structure must be initialised to all zeros before being
|
|
* filled. Only compulsory parameters need to be filled prior initialization.
|
|
*
|
|
* This structure must be used with init functions srsran_ofdm_rx_init_cfg and srsran_ofdm_tx_init_cfg. These provide
|
|
* more flexible options.
|
|
*/
|
|
typedef struct SRSRAN_API {
|
|
// Compulsory parameters
|
|
uint32_t nof_prb; ///< Number of Resource Block
|
|
cf_t* in_buffer; ///< Input bnuffer pointer
|
|
cf_t* out_buffer; ///< Output buffer pointer
|
|
srsran_cp_t cp; ///< Cyclic prefix type
|
|
|
|
// Optional parameters
|
|
srsran_sf_t sf_type; ///< Subframe type, normal or MBSFN
|
|
bool normalize; ///< Normalization flag, it divides the output by square root of the symbol size
|
|
float freq_shift_f; ///< Frequency shift, normalised by sampling rate (used in UL)
|
|
float rx_window_offset; ///< DFT Window offset in CP portion (0-1), RX only
|
|
uint32_t symbol_sz; ///< Symbol size, forces a given symbol size for the number of PRB
|
|
bool keep_dc; ///< If true, it does not remove the DC
|
|
} srsran_ofdm_cfg_t;
|
|
|
|
/**
|
|
* @struct srsran_ofdm_t
|
|
* OFDM object, common for Tx and Rx
|
|
*/
|
|
typedef struct SRSRAN_API {
|
|
srsran_ofdm_cfg_t cfg;
|
|
srsran_dft_plan_t fft_plan;
|
|
srsran_dft_plan_t fft_plan_sf[2];
|
|
uint32_t max_prb;
|
|
uint32_t nof_symbols;
|
|
uint32_t nof_guards;
|
|
uint32_t nof_re;
|
|
uint32_t slot_sz;
|
|
uint32_t sf_sz;
|
|
cf_t* tmp; // for removing zero padding
|
|
bool mbsfn_subframe;
|
|
uint32_t mbsfn_guard_len;
|
|
uint32_t nof_symbols_mbsfn;
|
|
uint8_t non_mbsfn_region;
|
|
uint32_t window_offset_n;
|
|
cf_t* shift_buffer;
|
|
cf_t* window_offset_buffer;
|
|
} srsran_ofdm_t;
|
|
|
|
/**
|
|
* @brief Initialises or reconfigures OFDM receiver
|
|
*
|
|
* @note The reconfiguration of the OFDM object considers only CP, number of PRB and optionally the FFT size
|
|
* @attention The OFDM object must be zeroed externally prior calling the initialization for first time
|
|
*
|
|
* @param q OFDM object
|
|
* @param cfg OFDM configuration
|
|
* @return SRSRAN_SUCCESS if the initialization/reconfiguration is successful, SRSRAN_ERROR code otherwise
|
|
*/
|
|
SRSRAN_API int srsran_ofdm_rx_init_cfg(srsran_ofdm_t* q, srsran_ofdm_cfg_t* cfg);
|
|
|
|
/**
|
|
* @brief Initialises or reconfigures OFDM transmitter
|
|
*
|
|
* @note The reconfiguration of the OFDM object considers only CP, number of PRB and optionally the FFT size
|
|
* @attention The OFDM object must be zeroed externally prior calling the initialization for first time
|
|
*
|
|
* @param q OFDM object
|
|
* @param cfg OFDM configuration
|
|
* @return SRSRAN_SUCCESS if the initialization/reconfiguration is successful, SRSRAN_ERROR code otherwise
|
|
*/
|
|
SRSRAN_API int srsran_ofdm_tx_init_cfg(srsran_ofdm_t* q, srsran_ofdm_cfg_t* cfg);
|
|
|
|
SRSRAN_API int
|
|
srsran_ofdm_rx_init_mbsfn(srsran_ofdm_t* q, srsran_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);
|
|
|
|
SRSRAN_API int
|
|
srsran_ofdm_rx_init(srsran_ofdm_t* q, srsran_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);
|
|
|
|
SRSRAN_API int srsran_ofdm_tx_set_prb(srsran_ofdm_t* q, srsran_cp_t cp, uint32_t nof_prb);
|
|
|
|
SRSRAN_API int srsran_ofdm_rx_set_prb(srsran_ofdm_t* q, srsran_cp_t cp, uint32_t nof_prb);
|
|
|
|
SRSRAN_API void srsran_ofdm_rx_free(srsran_ofdm_t* q);
|
|
|
|
SRSRAN_API void srsran_ofdm_rx_sf(srsran_ofdm_t* q);
|
|
|
|
SRSRAN_API void srsran_ofdm_rx_sf_ng(srsran_ofdm_t* q, cf_t* input, cf_t* output);
|
|
|
|
SRSRAN_API int
|
|
srsran_ofdm_tx_init(srsran_ofdm_t* q, srsran_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);
|
|
|
|
SRSRAN_API int
|
|
srsran_ofdm_tx_init_mbsfn(srsran_ofdm_t* q, srsran_cp_t cp, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);
|
|
|
|
SRSRAN_API void srsran_ofdm_tx_free(srsran_ofdm_t* q);
|
|
|
|
SRSRAN_API void srsran_ofdm_tx_sf(srsran_ofdm_t* q);
|
|
|
|
SRSRAN_API int srsran_ofdm_set_freq_shift(srsran_ofdm_t* q, float freq_shift);
|
|
|
|
SRSRAN_API void srsran_ofdm_set_normalize(srsran_ofdm_t* q, bool normalize_enable);
|
|
|
|
SRSRAN_API void srsran_ofdm_set_non_mbsfn_region(srsran_ofdm_t* q, uint8_t non_mbsfn_region);
|
|
|
|
#endif // SRSRAN_OFDM_H
|