mirror of https://github.com/PentHertz/srsLTE.git
103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_ZC_SEQUENCE_H
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#define SRSRAN_ZC_SEQUENCE_H
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#include "srsran/config.h"
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#include <stdbool.h>
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#include <stdint.h>
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/**
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* @brief Defines the maximum number of ZC sequence groups (u)
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*/
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#define SRSRAN_ZC_SEQUENCE_NOF_GROUPS 30
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/**
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* @brief Defines the maximum number of base sequences (v)
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*/
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#define SRSRAN_ZC_SEQUENCE_NOF_BASE 2
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/**
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* @brief Generates ZC sequences given the required parameters used in the TS 36 series (LTE)
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*
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* @remark Implemented as defined in TS 36.211 section 5.5.1 Generation of the reference signal sequence
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*
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* @param[in] u Group number {0,1,...29}
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* @param[in] v Base sequence
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* @param[in] alpha Phase shift
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* @param[in] nof_prb Number of PRB
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* @param[out] sequence Output sequence
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* @return SRSRAN_SUCCESS if the generation is successful, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_zc_sequence_generate_lte(uint32_t u, uint32_t v, float alpha, uint32_t nof_prb, cf_t* sequence);
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/**
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* @brief Generates ZC sequences given the required parameters used in the TS 38 series (NR)
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*
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* @remark Implemented as defined in TS 38.211 section 5.2.2 Low-PAPR sequence generation
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*
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* @param u Group number {0,1,...29}
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* @param v base sequence
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* @param alpha Phase shift
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* @param m Number of PRB
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* @param delta Delta parameter described in specification
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* @param sequence Output sequence
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* @return SRSRAN_SUCCESS if the generation is successful, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int
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srsran_zc_sequence_generate_nr(uint32_t u, uint32_t v, float alpha, uint32_t m, uint32_t delta, cf_t* sequence);
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/**
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* @brief Low-PAPR ZC sequence look-up-table
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*/
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typedef struct SRSRAN_API {
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uint32_t M_zc;
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uint32_t nof_alphas;
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cf_t* sequence[SRSRAN_ZC_SEQUENCE_NOF_GROUPS][SRSRAN_ZC_SEQUENCE_NOF_BASE];
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} srsran_zc_sequence_lut_t;
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/**
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* @brief Initialises a Low-PAPR sequence look-up-table object using NR tables
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*
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* @param q Object pointer
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* @param m Number of PRB
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* @param delta Delta parameter described in specification
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* @param alphas Vector with the alpha shift parameters
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* @param nof_alphas Number alpha shifts to generate
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* @return SRSRAN_SUCCESS if the initialization is successful, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_zc_sequence_lut_init_nr(srsran_zc_sequence_lut_t* q,
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uint32_t m,
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uint32_t delta,
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float* alphas,
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uint32_t nof_alphas);
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/**
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* @brief Deallocates a Low-PAPR sequence look-up-table object
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* @param q Object pointer
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*/
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SRSRAN_API void srsran_zc_sequence_lut_free(srsran_zc_sequence_lut_t* q);
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/**
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* @brief Get a Low-PAPR sequence from the LUT
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* @param q Object pointer
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* @param u Group number {0,1,...29}
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* @param v base sequence
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* @param alpha_idx Phase shift index
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* @return SRSRAN_SUCCESS if the generation is successful, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API const cf_t*
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srsran_zc_sequence_lut_get(const srsran_zc_sequence_lut_t* q, uint32_t u, uint32_t v, uint32_t alpha_idx);
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#endif // SRSRAN_ZC_SEQUENCE_H
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