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104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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* Copyright 2013-2020 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: ch_awgn.h
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*
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* Description: Additive white gaussian noise channel object
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*
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* Reference:
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*********************************************************************************************/
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#include <stdint.h>
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#include "srslte/config.h"
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#ifndef SRSLTE_CH_AWGN_H
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#define SRSLTE_CH_AWGN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* The srsLTE channel AWGN implements an efficient Box-Muller Method accelerated with SIMD.
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*/
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typedef struct {
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float* table_cos;
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float* table_log;
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uint32_t rand_state;
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float std_dev;
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} srslte_channel_awgn_t;
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/**
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* Initialization function of the channel AWGN object
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*
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* @param q AWGN channel object
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* @param seed random generator seed
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*/
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SRSLTE_API int srslte_channel_awgn_init(srslte_channel_awgn_t* q, uint32_t seed);
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/**
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* Sets the noise level N0 in decibels full scale (dBfs)
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*
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* @param q AWGN channel object
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* @param n0_dBfs noise level
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*/
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SRSLTE_API int srslte_channel_awgn_set_n0(srslte_channel_awgn_t* q, float n0_dBfs);
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/**
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* Runs the complex AWGN channel
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*
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* @param q AWGN channel object
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* @param in complex input array
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* @param out complex output array
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* @param length number of samples
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*/
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SRSLTE_API void srslte_channel_awgn_run_c(srslte_channel_awgn_t* q, const cf_t* in, cf_t* out, uint32_t length);
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/**
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* Runs the real AWGN channel
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*
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* @param q AWGN channel object
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* @param in real input array
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* @param out real output array
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* @param length number of samples
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*/
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SRSLTE_API void srslte_channel_awgn_run_f(srslte_channel_awgn_t* q, const float* in, float* out, uint32_t length);
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/**
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* Free AWGN channel generator data
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*
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* @param q AWGN channel object
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*/
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SRSLTE_API void srslte_channel_awgn_free(srslte_channel_awgn_t* q);
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SRSLTE_API void srslte_ch_awgn_c(const cf_t* input, cf_t* output, float variance, uint32_t len);
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SRSLTE_API void srslte_ch_awgn_f(const float* x, float* y, float variance, uint32_t len);
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SRSLTE_API float srslte_ch_awgn_get_variance(float ebno_db, float rate);
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#ifdef __cplusplus
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}
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#endif
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#endif // SRSLTE_CH_AWGN_H
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