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59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/**
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* Copyright 2013-2021 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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/******************************************************************************
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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 SRSLTE_RESAMPLE_ARB_H
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#define SRSLTE_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 "srslte/config.h"
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#define SRSLTE_RESAMPLE_ARB_N_35 35
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#define SRSLTE_RESAMPLE_ARB_N 32 // Polyphase filter rows
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#define SRSLTE_RESAMPLE_ARB_M 8 // Polyphase filter columns
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typedef struct SRSLTE_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[SRSLTE_RESAMPLE_ARB_M]; // Our window of samples
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} srslte_resample_arb_t;
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SRSLTE_API void srslte_resample_arb_init(srslte_resample_arb_t* q, float rate, bool interpolate);
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SRSLTE_API int srslte_resample_arb_compute(srslte_resample_arb_t* q, cf_t* input, cf_t* output, int n_in);
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#endif // SRSLTE_RESAMPLE_ARB_
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