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