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105 lines
4.1 KiB
C
105 lines
4.1 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 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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/******************************************************************************
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* File: interp.h
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*
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* Description: Linear and vector interpolation
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*
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* Reference:
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*****************************************************************************/
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#ifndef SRSLTE_INTERP_H
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#define SRSLTE_INTERP_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "srslte/config.h"
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/************* STATIC LINEAR INTERPOLATION FUNCTIONS */
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SRSLTE_API cf_t srslte_interp_linear_onesample(cf_t input0, cf_t input1);
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SRSLTE_API cf_t srslte_interp_linear_onesample_cabs(cf_t input0, cf_t input1);
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SRSLTE_API void srslte_interp_linear_offset_cabs(cf_t* input,
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cf_t* output,
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uint32_t M,
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uint32_t len,
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uint32_t off_st,
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uint32_t off_end);
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SRSLTE_API void srslte_interp_linear_f(float* input, float* output, uint32_t M, uint32_t len);
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/* Interpolation between vectors */
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typedef struct {
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cf_t* diff_vec;
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uint32_t vector_len;
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uint32_t max_vector_len;
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} srslte_interp_linsrslte_vec_t;
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SRSLTE_API int srslte_interp_linear_vector_init(srslte_interp_linsrslte_vec_t* q, uint32_t vector_len);
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SRSLTE_API void srslte_interp_linear_vector_free(srslte_interp_linsrslte_vec_t* q);
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SRSLTE_API int srslte_interp_linear_vector_resize(srslte_interp_linsrslte_vec_t* q, uint32_t vector_len);
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SRSLTE_API void srslte_interp_linear_vector(srslte_interp_linsrslte_vec_t* q,
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cf_t* in0,
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cf_t* in1,
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cf_t* between,
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uint32_t in1_in0_d,
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uint32_t M);
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SRSLTE_API void srslte_interp_linear_vector2(srslte_interp_linsrslte_vec_t* q,
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cf_t* in0,
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cf_t* in1,
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cf_t* start,
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cf_t* between,
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uint32_t in1_in0_d,
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uint32_t M);
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SRSLTE_API void srslte_interp_linear_vector3(srslte_interp_linsrslte_vec_t* q,
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cf_t* in0,
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cf_t* in1,
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cf_t* start,
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cf_t* between,
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uint32_t in1_in0_d,
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uint32_t M,
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bool to_right,
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uint32_t len);
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/* Interpolation within a vector */
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typedef struct {
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cf_t* diff_vec;
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cf_t* diff_vec2;
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float* ramp;
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uint32_t vector_len;
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uint32_t M;
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uint32_t max_vector_len;
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uint32_t max_M;
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} srslte_interp_lin_t;
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SRSLTE_API int srslte_interp_linear_init(srslte_interp_lin_t* q, uint32_t vector_len, uint32_t M);
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SRSLTE_API void srslte_interp_linear_free(srslte_interp_lin_t* q);
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SRSLTE_API int srslte_interp_linear_resize(srslte_interp_lin_t* q, uint32_t vector_len, uint32_t M);
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SRSLTE_API void
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srslte_interp_linear_offset(srslte_interp_lin_t* q, cf_t* input, cf_t* output, uint32_t off_st, uint32_t off_end);
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#endif // SRSLTE_INTERP_H
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