mirror of https://github.com/PentHertz/srsLTE.git
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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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 LTEFFT_
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#define LTEFFT_
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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 <stdlib.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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/* This is common for both directions */
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typedef struct SRSLTE_API{
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srslte_dft_plan_t fft_plan;
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uint32_t nof_symbols;
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uint32_t symbol_sz;
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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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srslte_cp_t cp;
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cf_t *tmp; // for removing zero padding
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bool freq_shift;
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cf_t *shift_buffer;
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}srslte_ofdm_t;
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SRSLTE_API int srslte_ofdm_init_(srslte_ofdm_t *q,
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srslte_cp_t cp,
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int symbol_sz,
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int nof_prb,
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srslte_dft_dir_t dir);
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SRSLTE_API int srslte_ofdm_rx_init(srslte_ofdm_t *q,
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srslte_cp_t cp_type,
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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_slot(srslte_ofdm_t *q,
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cf_t *input,
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cf_t *output);
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SRSLTE_API void srslte_ofdm_rx_sf(srslte_ofdm_t *q,
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cf_t *input,
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cf_t *output);
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SRSLTE_API int srslte_ofdm_tx_init(srslte_ofdm_t *q,
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srslte_cp_t cp_type,
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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_slot(srslte_ofdm_t *q,
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cf_t *input,
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cf_t *output);
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SRSLTE_API void srslte_ofdm_tx_sf(srslte_ofdm_t *q,
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cf_t *input,
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cf_t *output);
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SRSLTE_API int srslte_ofdm_set_freq_shift(srslte_ofdm_t *q,
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float freq_shift);
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SRSLTE_API void srslte_ofdm_set_normalize(srslte_ofdm_t *q,
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bool normalize_enable);
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#endif
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