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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
11 years ago
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/*
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* Copyright (c) 2013, Ismael Gomez-Miguelez <gomezi@tcd.ie>.
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* This file is part of OSLD-lib (http://https://github.com/ismagom/osld-lib)
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*
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* OSLD-lib 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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OSLD-lib 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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* You should have received a copy of the GNU Lesser General Public License
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* along with OSLD-lib. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DEMOD_SOFT_
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#define DEMOD_SOFT_
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#include <complex.h>
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#include <stdint.h>
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#include "modem_table.h"
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enum alg { EXACT, APPROX };
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typedef struct {
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float sigma; // noise power
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enum alg alg_type; // soft demapping algorithm (EXACT or APPROX)
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modem_table_t *table; // symbol mapping table (see modem_table.h)
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}demod_soft_t;
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void demod_soft_init(demod_soft_t *q);
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void demod_soft_table_set(demod_soft_t *q, modem_table_t *table);
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void demod_soft_alg_set(demod_soft_t *q, enum alg alg_type);
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void demod_soft_sigma_set(demod_soft_t *q, float sigma);
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int demod_soft_demodulate(demod_soft_t *q, const cf* symbols, float* llr, int nsymbols);
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/* High-level API */
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typedef struct {
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demod_soft_t obj;
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modem_table_t table;
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struct demod_soft_init {
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enum modem_std std; // symbol mapping standard (see modem_table.h)
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} init;
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const cf* input;
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int in_len;
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struct demod_soft_ctrl_in {
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float sigma; // Estimated noise variance
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enum alg alg_type; // soft demapping algorithm (EXACT or APPROX)
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}ctrl_in;
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float* output;
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int *out_len;
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}demod_soft_hl;
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int demod_soft_initialize(demod_soft_hl* hl);
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int demod_soft_work(demod_soft_hl* hl);
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int demod_soft_stop(demod_soft_hl* hl);
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#endif
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