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59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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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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#include <complex.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <math.h>
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#include "gauss.h"
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#include "srslte/channel/ch_awgn.h"
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float srslte_ch_awgn_get_variance(float ebno_db, float rate) {
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float esno_db = ebno_db + 10 * log10f(rate);
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return sqrtf(1 / (powf(10, esno_db / 10)));
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}
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void srslte_ch_awgn_c(const cf_t* x, cf_t* y, float variance, uint32_t len) {
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cf_t tmp;
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uint32_t i;
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for (i=0;i<len;i++) {
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__real__ tmp = rand_gauss();
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__imag__ tmp = rand_gauss();
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tmp *= variance;
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y[i] = tmp + x[i];
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}
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}
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void srslte_ch_awgn_f(const float* x, float* y, float variance, uint32_t len) {
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uint32_t i;
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for (i=0;i<len;i++) {
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y[i] = x[i] + variance * rand_gauss();
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}
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}
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