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pelgraine
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*---------------------------------------------------------------------------*\
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FILE........: ofdm_internal.h
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AUTHORS.....: David Rowe & Steve Sampson
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DATE CREATED: June 2017
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OFDM Internal definitions.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2017 David Rowe
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All rights reserved.
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This program 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 version 2, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OFDM_INTERNAL_H
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#define OFDM_INTERNAL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <complex.h>
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#include <stdbool.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846f /* math constant */
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#endif
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#define TAU (2.0f * M_PI) /* mathematical constant */
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#define OFDM_NC 16
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#define OFDM_TS 0.018f
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#define OFDM_RS (1.0f / OFDM_TS)
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#define OFDM_FS 8000.0f
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#define OFDM_BPS 2
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#define OFDM_TCP 0.002f
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#define OFDM_NS 8
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#define OFDM_CENTRE 1500.0f
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/* To prevent C99 warning */
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#define OFDM_M 144
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#define OFDM_NCP 16
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#ifdef OLD_STYLE
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/* This will produce a warning in C99 as (int) makes these variable */
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#define OFDM_M ((int)(OFDM_FS / OFDM_RS))
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#define OFDM_NCP ((int)(OFDM_TCP * OFDM_FS))
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#endif
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#define OFDM_FTWINDOWWIDTH 11
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#define OFDM_BITSPERFRAME ((OFDM_NS - 1) * (OFDM_NC * OFDM_BPS))
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#define OFDM_ROWSPERFRAME (OFDM_BITSPERFRAME / (OFDM_NC * OFDM_BPS))
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#define OFDM_SAMPLESPERFRAME (OFDM_NS * (OFDM_M + OFDM_NCP))
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#define OFDM_MAX_SAMPLESPERFRAME (OFDM_SAMPLESPERFRAME + (OFDM_M + OFDM_NCP)/4)
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#define OFDM_RXBUF (3 * OFDM_SAMPLESPERFRAME + 3 * (OFDM_M + OFDM_NCP))
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struct OFDM {
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float foff_est_gain;
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float foff_est_hz;
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int verbose;
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int sample_point;
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int timing_est;
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int nin;
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bool timing_en;
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bool foff_est_en;
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bool phase_est_en;
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complex float pilot_samples[OFDM_M + OFDM_NCP];
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complex float W[OFDM_NC + 2][OFDM_M];
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complex float rxbuf[OFDM_RXBUF];
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complex float pilots[OFDM_NC + 2];
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float w[OFDM_NC + 2];
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/* Demodulator data */
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complex float rx_sym[OFDM_NS + 3][OFDM_NC + 2];
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complex float rx_np[OFDM_ROWSPERFRAME * OFDM_NC];
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float rx_amp[OFDM_ROWSPERFRAME * OFDM_NC];
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float aphase_est_pilot_log[OFDM_ROWSPERFRAME * OFDM_NC];
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};
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#ifdef __cplusplus
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}
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#endif
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#endif
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