mirror of https://github.com/PentHertz/srsLTE.git
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/**
|
|
*
|
|
* \section COPYRIGHT
|
|
*
|
|
* Copyright 2013-2020 Software Radio Systems Limited
|
|
*
|
|
* By using this file, you agree to the terms and conditions set
|
|
* forth in the LICENSE file which can be found at the top level of
|
|
* the distribution.
|
|
*
|
|
*/
|
|
|
|
/******************************************************************************
|
|
* 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 SRSLTE_RESAMPLE_ARB_H
|
|
#define SRSLTE_RESAMPLE_ARB_H
|
|
|
|
#include <complex.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#include "srslte/config.h"
|
|
|
|
#define SRSLTE_RESAMPLE_ARB_N_35 35
|
|
#define SRSLTE_RESAMPLE_ARB_N 32 // Polyphase filter rows
|
|
#define SRSLTE_RESAMPLE_ARB_M 8 // Polyphase filter columns
|
|
|
|
typedef struct SRSLTE_API {
|
|
float rate; // Resample rate
|
|
float step; // Step increment through filter
|
|
float acc; // Index into filter
|
|
bool interpolate;
|
|
cf_t reg[SRSLTE_RESAMPLE_ARB_M]; // Our window of samples
|
|
|
|
} srslte_resample_arb_t;
|
|
|
|
SRSLTE_API void srslte_resample_arb_init(srslte_resample_arb_t* q, float rate, bool interpolate);
|
|
|
|
SRSLTE_API int srslte_resample_arb_compute(srslte_resample_arb_t* q, cf_t* input, cf_t* output, int n_in);
|
|
|
|
#endif // SRSLTE_RESAMPLE_ARB_
|