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109 lines
4.0 KiB
C
109 lines
4.0 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: agc.h
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*
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* Description: Automatic gain control
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* This module is not currently used
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*
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* Reference:
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*********************************************************************************************/
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#ifndef SRSLTE_AGC_H
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#define SRSLTE_AGC_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_AGC_CALLBACK(NAME) void(NAME)(void* h, float gain_db)
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#define SRSLTE_AGC_DEFAULT_TARGET (0.3f) /* Average RMS target or maximum peak target*/
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#define SRSLTE_AGC_DEFAULT_BW (0.3f) /* Moving average coefficient */
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#define SRSLTE_AGC_HOLD_COUNT (20) /* Number of frames to wait after setting the gain before start measuring */
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#define SRSLTE_AGC_MIN_MEASUREMENTS (10) /* Minimum number of measurements */
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#define SRSLTE_AGC_MIN_GAIN_OFFSET (2.0f) /* Mimum of gain offset to set the radio gain */
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typedef enum SRSLTE_API { SRSLTE_AGC_MODE_ENERGY = 0, SRSLTE_AGC_MODE_PEAK_AMPLITUDE } srslte_agc_mode_t;
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/*
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* The AGC has been implemented using 3 states:
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* - init: it simply starts the process of measuring
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* - measure: performs a minimum of SRSLTE_AGC_MIN_MEASUREMENTS and does not set the gain until it needs
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* SRSLTE_AGC_MIN_GAIN_OFFSET dB more of gain. The gain is set in the enter hold transition.
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* - hold: waits for SRSLTE_AGC_HOLD_COUNT frames as a Rx gain transition period. After this period, it enters measure
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* state.
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*
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* FSM abstraction:
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*
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* +------+ Enter measure +---------+ Enter hold +------+
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* | init | ---------------->| Measure |--------------->| Hold |
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* +------+ +---------+ +------+
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* ^ Enter measure |
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* +-------------------------+
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*/
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typedef enum { SRSLTE_AGC_STATE_INIT = 0, SRSLTE_AGC_STATE_MEASURE, SRSLTE_AGC_STATE_HOLD } srslte_agc_state_t;
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typedef struct SRSLTE_API {
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float bandwidth;
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float gain_db;
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float gain_offset_db;
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float min_gain_db;
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float max_gain_db;
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float default_gain_db;
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float y_out;
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bool isfirst;
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void* uhd_handler;
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SRSLTE_AGC_CALLBACK(*set_gain_callback);
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srslte_agc_mode_t mode;
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float target;
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uint32_t nof_frames;
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uint32_t frame_cnt;
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uint32_t hold_cnt;
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float* y_tmp;
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srslte_agc_state_t state;
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} srslte_agc_t;
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SRSLTE_API int srslte_agc_init_acc(srslte_agc_t* q, srslte_agc_mode_t mode, uint32_t nof_frames);
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SRSLTE_API int srslte_agc_init_uhd(srslte_agc_t* q,
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srslte_agc_mode_t mode,
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uint32_t nof_frames,
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SRSLTE_AGC_CALLBACK(set_gain_callback),
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void* uhd_handler);
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SRSLTE_API void srslte_agc_free(srslte_agc_t* q);
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SRSLTE_API void srslte_agc_reset(srslte_agc_t* q);
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SRSLTE_API void srslte_agc_set_gain_range(srslte_agc_t* q, float min_gain_db, float max_gain_db);
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SRSLTE_API float srslte_agc_get_gain(srslte_agc_t* q);
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SRSLTE_API void srslte_agc_set_gain(srslte_agc_t* q, float init_gain_value_db);
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SRSLTE_API void srslte_agc_process(srslte_agc_t* q, cf_t* signal, uint32_t len);
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#endif // SRSLTE_AGC_H
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