mirror of https://github.com/PentHertz/srsLTE.git
109 lines
4.0 KiB
C
109 lines
4.0 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: agc.h
|
|
*
|
|
* Description: Automatic gain control
|
|
* This module is not currently used
|
|
*
|
|
* Reference:
|
|
*********************************************************************************************/
|
|
|
|
#ifndef SRSRAN_AGC_H
|
|
#define SRSRAN_AGC_H
|
|
|
|
#include <complex.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#include "srsran/config.h"
|
|
|
|
#define SRSRAN_AGC_CALLBACK(NAME) void(NAME)(void* h, float gain_db)
|
|
#define SRSRAN_AGC_DEFAULT_TARGET (0.3f) /* Average RMS target or maximum peak target*/
|
|
#define SRSRAN_AGC_DEFAULT_BW (0.3f) /* Moving average coefficient */
|
|
#define SRSRAN_AGC_HOLD_COUNT (20) /* Number of frames to wait after setting the gain before start measuring */
|
|
#define SRSRAN_AGC_MIN_MEASUREMENTS (10) /* Minimum number of measurements */
|
|
#define SRSRAN_AGC_MIN_GAIN_OFFSET (2.0f) /* Mimum of gain offset to set the radio gain */
|
|
|
|
typedef enum SRSRAN_API { SRSRAN_AGC_MODE_ENERGY = 0, SRSRAN_AGC_MODE_PEAK_AMPLITUDE } srsran_agc_mode_t;
|
|
|
|
/*
|
|
* The AGC has been implemented using 3 states:
|
|
* - init: it simply starts the process of measuring
|
|
* - measure: performs a minimum of SRSRAN_AGC_MIN_MEASUREMENTS and does not set the gain until it needs
|
|
* SRSRAN_AGC_MIN_GAIN_OFFSET dB more of gain. The gain is set in the enter hold transition.
|
|
* - hold: waits for SRSRAN_AGC_HOLD_COUNT frames as a Rx gain transition period. After this period, it enters measure
|
|
* state.
|
|
*
|
|
* FSM abstraction:
|
|
*
|
|
* +------+ Enter measure +---------+ Enter hold +------+
|
|
* | init | ---------------->| Measure |--------------->| Hold |
|
|
* +------+ +---------+ +------+
|
|
* ^ Enter measure |
|
|
* +-------------------------+
|
|
*/
|
|
|
|
typedef enum { SRSRAN_AGC_STATE_INIT = 0, SRSRAN_AGC_STATE_MEASURE, SRSRAN_AGC_STATE_HOLD } srsran_agc_state_t;
|
|
|
|
typedef struct SRSRAN_API {
|
|
float bandwidth;
|
|
float gain_db;
|
|
float gain_offset_db;
|
|
float min_gain_db;
|
|
float max_gain_db;
|
|
float default_gain_db;
|
|
float y_out;
|
|
bool isfirst;
|
|
void* uhd_handler;
|
|
SRSRAN_AGC_CALLBACK(*set_gain_callback);
|
|
srsran_agc_mode_t mode;
|
|
float target;
|
|
uint32_t nof_frames;
|
|
uint32_t frame_cnt;
|
|
uint32_t hold_cnt;
|
|
float* y_tmp;
|
|
srsran_agc_state_t state;
|
|
} srsran_agc_t;
|
|
|
|
SRSRAN_API int srsran_agc_init_acc(srsran_agc_t* q, srsran_agc_mode_t mode, uint32_t nof_frames);
|
|
|
|
SRSRAN_API int srsran_agc_init_uhd(srsran_agc_t* q,
|
|
srsran_agc_mode_t mode,
|
|
uint32_t nof_frames,
|
|
SRSRAN_AGC_CALLBACK(set_gain_callback),
|
|
void* uhd_handler);
|
|
|
|
SRSRAN_API void srsran_agc_free(srsran_agc_t* q);
|
|
|
|
SRSRAN_API void srsran_agc_reset(srsran_agc_t* q);
|
|
|
|
SRSRAN_API void srsran_agc_set_gain_range(srsran_agc_t* q, float min_gain_db, float max_gain_db);
|
|
|
|
SRSRAN_API float srsran_agc_get_gain(srsran_agc_t* q);
|
|
|
|
SRSRAN_API void srsran_agc_set_gain(srsran_agc_t* q, float init_gain_value_db);
|
|
|
|
SRSRAN_API void srsran_agc_process(srsran_agc_t* q, cf_t* signal, uint32_t len);
|
|
|
|
#endif // SRSRAN_AGC_H
|