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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
11 years ago
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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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* libLTE 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 Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser 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 "gauss.h"
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#include "lte/channel/ch_awgn.h"
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void ch_awgn_c(const cf_t* x, cf_t* y, float variance, int buff_sz) {
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_Complex float tmp;
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int i;
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for (i=0;i<buff_sz;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 ch_awgn_f(const float* x, float* y, float variance, int buff_sz) {
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int i;
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for (i=0;i<buff_sz;i++) {
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y[i] = x[i] + variance * rand_gauss();
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}
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}
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/* High-level API */
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int ch_awgn_initialize(ch_awgn_hl* hl) {
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return 0;
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}
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int ch_awgn_work(ch_awgn_hl* hl) {
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ch_awgn_c(hl->input,hl->output,hl->ctrl_in.variance,hl->in_len);
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hl->out_len = hl->in_len;
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return 0;
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}
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int ch_awgn_stop(ch_awgn_hl* hl) {
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return 0;
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}
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