srsLTE/lib/include/srslte/phy/channel/ch_awgn.h

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/*
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* Copyright 2013-2020 Software Radio Systems Limited
*
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* This file is part of srsLTE.
*
* 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
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE 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
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* GNU Affero General Public License for more details.
*
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* 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: ch_awgn.h
*
* Description: Additive white gaussian noise channel object
*
* Reference:
*********************************************************************************************/
#include <stdint.h>
#include "srslte/config.h"
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#ifndef SRSLTE_CH_AWGN_H
#define SRSLTE_CH_AWGN_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* The srsLTE channel AWGN implements an efficient Box-Muller Method accelerated with SIMD.
*/
typedef struct {
cf_t* table_exp;
float* table_log;
uint32_t rand_state;
float std_dev;
} srslte_channel_awgn_t;
/**
* Initialization function of the channel AWGN object
*
* @param q AWGN channel object
* @param seed random generator seed
*/
SRSLTE_API int srslte_channel_awgn_init(srslte_channel_awgn_t* q, uint32_t seed);
/**
* Sets the noise level N0 in decibels full scale (dBfs)
*
* @param q AWGN channel object
* @param n0_dBfs noise level
*/
SRSLTE_API int srslte_channel_awgn_set_n0(srslte_channel_awgn_t* q, float n0_dBfs);
/**
* Runs the complex AWGN channel
*
* @param q AWGN channel object
* @param in complex input array
* @param out complex output array
* @param length number of samples
*/
SRSLTE_API void srslte_channel_awgn_run_c(srslte_channel_awgn_t* q, const cf_t* in, cf_t* out, uint32_t length);
/**
* Runs the real AWGN channel
*
* @param q AWGN channel object
* @param in real input array
* @param out real output array
* @param length number of samples
*/
SRSLTE_API void srslte_channel_awgn_run_f(srslte_channel_awgn_t* q, const float* in, float* out, uint32_t length);
/**
* Free AWGN channel generator data
*
* @param q AWGN channel object
*/
SRSLTE_API void srslte_channel_awgn_free(srslte_channel_awgn_t* q);
SRSLTE_API void srslte_ch_awgn_c(const cf_t* input, cf_t* output, float variance, uint32_t len);
SRSLTE_API void srslte_ch_awgn_f(const float* x, float* y, float variance, uint32_t len);
SRSLTE_API float srslte_ch_awgn_get_variance(float ebno_db, float rate);
#ifdef __cplusplus
}
#endif
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#endif // SRSLTE_CH_AWGN_H