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124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
/*
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* Copyright 2013-2020 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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#ifndef SRSLTE_OFDM_H
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#define SRSLTE_OFDM_H
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/**********************************************************************************************
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* File: ofdm.h
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*
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* Description: OFDM modulation object.
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* Used in generation of downlink OFDM signals.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6
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*********************************************************************************************/
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#include <strings.h>
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/dft/dft.h"
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/**
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* @struct srslte_ofdm_cfg_t
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* Contains the generic OFDM modulator configuration. The structure must be initialised to all zeros before being
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* filled. Only compulsory parameters need to be filled prior initialization.
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*
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* This structure must be used with init functions srslte_ofdm_rx_init_cfg and srslte_ofdm_tx_init_cfg. These provide
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* more flexible options.
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*/
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typedef struct SRSLTE_API {
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// Compulsory parameters
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uint32_t nof_prb; //< Number of Resource Block
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cf_t* in_buffer; //< Input bnuffer pointer
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cf_t* out_buffer; //< Output buffer pointer
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srslte_cp_t cp; //< Cyclic prefix type
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// Optional parameters
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srslte_sf_t sf_type; //< Subframe type, normal or MBSFN
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bool normalize; //< Normalization flag, it divides the output by square root of the symbol size
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float freq_shift_f; //< Frequency shift, normalised by sampling rate (used in UL)
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float rx_window_offset; //< DFT Window offset in CP portion (0-1), RX only
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uint32_t symbol_sz; //< Symbol size, forces a given symbol size for the number of PRB
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} srslte_ofdm_cfg_t;
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/**
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* @struct srslte_ofdm_t
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* OFDM object, common for Tx and Rx
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*/
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typedef struct SRSLTE_API {
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srslte_ofdm_cfg_t cfg;
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srslte_dft_plan_t fft_plan;
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srslte_dft_plan_t fft_plan_sf[2];
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uint32_t max_prb;
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uint32_t nof_symbols;
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uint32_t nof_guards;
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uint32_t nof_re;
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uint32_t slot_sz;
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uint32_t sf_sz;
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cf_t* tmp; // for removing zero padding
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bool mbsfn_subframe;
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uint32_t mbsfn_guard_len;
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uint32_t nof_symbols_mbsfn;
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uint8_t non_mbsfn_region;
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uint32_t window_offset_n;
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cf_t* shift_buffer;
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cf_t* window_offset_buffer;
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} srslte_ofdm_t;
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SRSLTE_API int srslte_ofdm_rx_init_cfg(srslte_ofdm_t* q, srslte_ofdm_cfg_t* cfg);
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SRSLTE_API int srslte_ofdm_tx_init_cfg(srslte_ofdm_t* q, srslte_ofdm_cfg_t* cfg);
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SRSLTE_API int
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srslte_ofdm_rx_init_mbsfn(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);
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SRSLTE_API int
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srslte_ofdm_rx_init(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);
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SRSLTE_API int srslte_ofdm_tx_set_prb(srslte_ofdm_t* q, srslte_cp_t cp, uint32_t nof_prb);
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SRSLTE_API int srslte_ofdm_rx_set_prb(srslte_ofdm_t* q, srslte_cp_t cp, uint32_t nof_prb);
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SRSLTE_API void srslte_ofdm_rx_free(srslte_ofdm_t* q);
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SRSLTE_API void srslte_ofdm_rx_sf(srslte_ofdm_t* q);
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SRSLTE_API void srslte_ofdm_rx_sf_ng(srslte_ofdm_t* q, cf_t* input, cf_t* output);
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SRSLTE_API int
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srslte_ofdm_tx_init(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);
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SRSLTE_API int
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srslte_ofdm_tx_init_mbsfn(srslte_ofdm_t* q, srslte_cp_t cp, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);
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SRSLTE_API void srslte_ofdm_tx_free(srslte_ofdm_t* q);
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SRSLTE_API void srslte_ofdm_tx_sf(srslte_ofdm_t* q);
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SRSLTE_API int srslte_ofdm_set_freq_shift(srslte_ofdm_t* q, float freq_shift);
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SRSLTE_API void srslte_ofdm_set_normalize(srslte_ofdm_t* q, bool normalize_enable);
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SRSLTE_API void srslte_ofdm_set_non_mbsfn_region(srslte_ofdm_t* q, uint8_t non_mbsfn_region);
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#endif // SRSLTE_OFDM_H
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