mirror of https://github.com/PentHertz/srsLTE.git
50 lines
1.4 KiB
C
50 lines
1.4 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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/******************************************************************************
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* File: resample_arb.h
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*
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* Description: Arbitrary rate resampler using a polyphase filter bank
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* implementation.
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*
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* Reference: Multirate Signal Processing for Communication Systems
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* fredric j. harris
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*****************************************************************************/
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#ifndef SRSRAN_RESAMPLE_ARB_H
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#define SRSRAN_RESAMPLE_ARB_H
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#include <complex.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "srsran/config.h"
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#define SRSRAN_RESAMPLE_ARB_N_35 35
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#define SRSRAN_RESAMPLE_ARB_N 32 // Polyphase filter rows
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#define SRSRAN_RESAMPLE_ARB_M 8 // Polyphase filter columns
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typedef struct SRSRAN_API {
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float rate; // Resample rate
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float step; // Step increment through filter
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float acc; // Index into filter
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bool interpolate;
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cf_t reg[SRSRAN_RESAMPLE_ARB_M]; // Our window of samples
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} srsran_resample_arb_t;
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SRSRAN_API void srsran_resample_arb_init(srsran_resample_arb_t* q, float rate, bool interpolate);
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SRSRAN_API int srsran_resample_arb_compute(srsran_resample_arb_t* q, cf_t* input, cf_t* output, int n_in);
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#endif // SRSRAN_RESAMPLE_ARB_
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