mirror of https://github.com/pvnis/srsRAN_4G.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/**
|
|
* Copyright 2013-2022 Software Radio Systems Limited
|
|
*
|
|
* This file is part of srsRAN.
|
|
*
|
|
* srsRAN is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* srsRAN is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* A copy of the GNU Affero General Public License can be found in
|
|
* the LICENSE file in the top-level directory of this distribution
|
|
* and at http://www.gnu.org/licenses/.
|
|
*
|
|
*/
|
|
|
|
/******************************************************************************
|
|
* File: resample_arb.h
|
|
*
|
|
* Description: Arbitrary rate resampler using a polyphase filter bank
|
|
* implementation.
|
|
*
|
|
* Reference: Multirate Signal Processing for Communication Systems
|
|
* fredric j. harris
|
|
*****************************************************************************/
|
|
|
|
#ifndef SRSRAN_RESAMPLE_ARB_H
|
|
#define SRSRAN_RESAMPLE_ARB_H
|
|
|
|
#include <complex.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#include "srsran/config.h"
|
|
|
|
#define SRSRAN_RESAMPLE_ARB_N_35 35
|
|
#define SRSRAN_RESAMPLE_ARB_N 32 // Polyphase filter rows
|
|
#define SRSRAN_RESAMPLE_ARB_M 8 // Polyphase filter columns
|
|
|
|
typedef struct SRSRAN_API {
|
|
float rate; // Resample rate
|
|
float step; // Step increment through filter
|
|
float acc; // Index into filter
|
|
bool interpolate;
|
|
cf_t reg[SRSRAN_RESAMPLE_ARB_M]; // Our window of samples
|
|
|
|
} srsran_resample_arb_t;
|
|
|
|
SRSRAN_API void srsran_resample_arb_init(srsran_resample_arb_t* q, float rate, bool interpolate);
|
|
|
|
SRSRAN_API int srsran_resample_arb_compute(srsran_resample_arb_t* q, cf_t* input, cf_t* output, int n_in);
|
|
|
|
#endif // SRSRAN_RESAMPLE_ARB_
|