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codec2/unittest/tofdm.c

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/*---------------------------------------------------------------------------*\
FILE........: tofdm.c
AUTHORS.....: David Rowe & Steve Sampson
DATE CREATED: June 2017
Tests for the C version of the OFDM modem. This program outputs a
file of Octave vectors that are loaded and automatically tested
against the Octave version of the modem by the Octave script tofdm.m
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2017 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2, as
published by the Free Software Foundation. This program 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 General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <complex.h>
#include <getopt.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "HRA_112_112.h" /* generated by ldpc_fsk_lib.m:ldpc_decode() */
#include "codec2_ofdm.h"
#include "comp_prim.h"
#include "mpdecode_core.h"
#include "octave.h"
#include "ofdm_internal.h"
#include "test_bits_ofdm.h"
#define NFRAMES 10
#define SAMPLE_CLOCK_OFFSET_PPM 100
#define FOFF_HZ 0.5f
#define ASCALE (2E5f * 1.1491f / 2.0f) /* scale from shorts back to floats */
#define CODED_BITSPERFRAME 224 /* number of LDPC codeword bits/frame */
/* QPSK constellation for symbol likelihood calculations */
static COMP S_matrix[] = {
{1.0f, 0.0f}, {0.0f, 1.0f}, {0.0f, -1.0f}, {-1.0f, 0.0f}};
/* constants we use a lot and don't want to have to deference all the time */
static float ofdm_tx_centre; /* TX Center frequency */
static float ofdm_rx_centre; /* RX Center frequency */
static float ofdm_fs; /* Sample rate */
static float ofdm_ts; /* Symbol cycle time */
static float ofdm_rs; /* Symbol rate */
static float ofdm_tcp; /* Cyclic prefix duration */
static float
ofdm_timing_mx_thresh; /* See 700D Part 4 Acquisition blog post and
ofdm_dev.m routines for how this was set */
static int ofdm_nc; /* NS-1 data symbols between pilots */
static int ofdm_ns;
static int ofdm_bps; /* Bits per symbol */
static int ofdm_m; /* duration of each symbol in samples */
static int ofdm_ncp; /* duration of CP in samples */
static int ofdm_ftwindowwidth;
static int ofdm_bitsperframe;
static int ofdm_rowsperframe;
static int ofdm_samplesperframe;
static int ofdm_samplespersymbol;
static int ofdm_max_samplesperframe;
static int ofdm_nrxbuf;
static int
ofdm_ntxtbits; /* reserve bits/frame for auxiliary text information */
static int ofdm_nuwbits; /* Unique word, used for positive indication of lock */
/*---------------------------------------------------------------------------*\
FUNCTION....: fs_offset()
AUTHOR......: David Rowe
DATE CREATED: May 2015
Simulates small Fs offset between mod and demod.
(Note: Won't work with float, works OK with double)
\*---------------------------------------------------------------------------*/
static int fs_offset(COMP out[], COMP in[], int n, float sample_rate_ppm) {
double f;
double tin = 0.0;
double step = 1.0 + sample_rate_ppm / 1E6;
int t1, t2;
int tout = 0;
while (tin < (double)(n - 1)) {
t1 = (int)floor(tin);
t2 = (int)ceil(tin);
assert(t2 < n);
f = tin - (double)t1;
out[tout].real =
((double)1.0 - f) * (double)in[t1].real + f * (double)in[t2].real;
out[tout].imag =
((double)1.0 - f) * (double)in[t1].imag + f * (double)in[t2].imag;
tin += step;
tout++;
// printf("tin: %f tout: %d f: %f\n", tin, tout, f);
}
return tout;
}
/*---------------------------------------------------------------------------*\
FUNCTION....: freq_shift()
AUTHOR......: David Rowe
DATE CREATED: 26/4/2012
Frequency shift modem signal. The use of complex input and output allows
single sided frequency shifting (no images).
\*---------------------------------------------------------------------------*/
static void freq_shift(COMP rx_fdm_fcorr[], COMP rx_fdm[], float foff,
COMP *foff_phase_rect, int nin) {
float temp = (TAU * foff / ofdm_fs);
COMP foff_rect = {cosf(temp), sinf(temp)};
int i;
for (i = 0; i < nin; i++) {
*foff_phase_rect = cmult(*foff_phase_rect, foff_rect);
rx_fdm_fcorr[i] = cmult(rx_fdm[i], *foff_phase_rect);
}
/* normalise digital oscillator as the magnitude can drift over time */
float mag = cabsolute(*foff_phase_rect);
foff_phase_rect->real /= mag;
foff_phase_rect->imag /= mag;
}
int main(int argc, char *argv[]) {
int opt_Nc = 0;
int ldpc_enable = 1;
struct OFDM *ofdm;
struct OFDM_CONFIG *ofdm_config;
static struct option long_options[] = {{"nc", required_argument, 0, 'n'},
{"noldpc", no_argument, 0, 'l'},
{0, 0, 0, 0}};
int opt_index = 0;
char c;
while ((c = getopt_long(argc, argv, "n:l", long_options, &opt_index)) != -1) {
switch (c) {
case 'n':
opt_Nc = atoi(optarg);
fprintf(stderr, "Nc = %d\n", opt_Nc);
break;
case 'l':
ldpc_enable = 0;
fprintf(stderr, "LDPC disabled\n");
break;
default:
fprintf(stderr,
"usage: %s [Options]:\n [-l --noldpc]\n [-n --nc "
"NumberoFCarriers]\n",
argv[0]);
exit(1);
}
}
// init once to get a copy of default config params
ofdm = ofdm_create(NULL);
assert(ofdm != NULL);
struct OFDM_CONFIG ofdm_config_default;
memcpy(&ofdm_config_default, ofdm_get_config_param(ofdm),
sizeof(struct OFDM_CONFIG));
ofdm_destroy(ofdm);
// now do a little customisation on default config, and re-create modem
// instance
if (opt_Nc) ofdm_config_default.nc = opt_Nc;
// printf("ofdm_create() 2\n");
ofdm = ofdm_create(&ofdm_config_default);
assert(ofdm != NULL);
ofdm_config = ofdm_get_config_param(ofdm);
ofdm_set_tx_bpf(ofdm, false);
// same levels as Octave sim
ofdm->amp_scale = 1.0;
// make local copies for convenience
ofdm_tx_centre = ofdm_config->tx_centre;
ofdm_rx_centre = ofdm_config->rx_centre;
ofdm_fs = ofdm_config->fs;
ofdm_ts = ofdm_config->ts;
ofdm_rs = ofdm_config->rs;
ofdm_tcp = ofdm_config->tcp;
ofdm_timing_mx_thresh = ofdm_config->timing_mx_thresh;
ofdm_nc = ofdm_config->nc;
ofdm_ns = ofdm_config->ns;
ofdm_bps = ofdm_config->bps;
ofdm_m = (int)(ofdm_config->fs / ofdm_config->rs);
ofdm_ncp = (int)(ofdm_config->tcp * ofdm_config->fs);
ofdm_ftwindowwidth = ofdm_config->ftwindowwidth;
ofdm_bitsperframe = ofdm_get_bits_per_frame(ofdm);
ofdm_rowsperframe = ofdm_bitsperframe / (ofdm_config->nc * ofdm_config->bps);
ofdm_samplesperframe = ofdm_get_samples_per_frame(ofdm);
ofdm_samplespersymbol = (ofdm->m + ofdm->ncp);
ofdm_max_samplesperframe = ofdm_get_max_samples_per_frame(ofdm);
ofdm_nrxbuf = ofdm->nrxbuf;
ofdm_ntxtbits = ofdm_config->txtbits;
ofdm_nuwbits = ofdm_config->nuwbits;
int tx_bits[ofdm_samplesperframe];
COMP tx[ofdm_samplesperframe]; /* one frame of tx samples */
int rx_bits[ofdm_bitsperframe]; /* one frame of rx bits */
printf("Nc = %d ofdm_bitsperframe: %d\n", ofdm_nc, ofdm_bitsperframe);
/* log arrays */
int tx_bits_log[ofdm_bitsperframe * NFRAMES];
COMP tx_log[ofdm_samplesperframe * NFRAMES];
COMP rx_log[ofdm_samplesperframe * NFRAMES];
COMP rxbuf_in_log[ofdm_max_samplesperframe * NFRAMES];
COMP rxbuf_log[ofdm_nrxbuf * NFRAMES];
COMP rx_sym_log[(ofdm_ns + 3) * NFRAMES][ofdm_nc + 2];
float phase_est_pilot_log[ofdm_rowsperframe * NFRAMES][ofdm_nc];
COMP rx_np_log[ofdm_rowsperframe * ofdm_nc * NFRAMES];
float rx_amp_log[ofdm_rowsperframe * ofdm_nc * NFRAMES];
float foff_hz_log[NFRAMES];
int rx_bits_log[ofdm_bitsperframe * NFRAMES];
int timing_est_log[NFRAMES];
int timing_valid_log[NFRAMES];
float timing_mx_log[NFRAMES];
float coarse_foff_est_hz_log[NFRAMES];
int sample_point_log[NFRAMES];
float symbol_likelihood_log[(CODED_BITSPERFRAME / ofdm_bps) *
(1 << ofdm_bps) * NFRAMES];
float bit_likelihood_log[CODED_BITSPERFRAME * NFRAMES];
int detected_data_log[CODED_BITSPERFRAME * NFRAMES];
float mean_amp_log[NFRAMES];
float snr_log[NFRAMES];
FILE *fout;
int f, i, j;
/* set up LDPC code */
struct LDPC ldpc;
ldpc.max_iter = HRA_112_112_MAX_ITER;
ldpc.dec_type = 0;
ldpc.q_scale_factor = 1;
ldpc.r_scale_factor = 1;
ldpc.CodeLength = HRA_112_112_CODELENGTH;
ldpc.NumberParityBits = HRA_112_112_NUMBERPARITYBITS;
ldpc.NumberRowsHcols = HRA_112_112_NUMBERROWSHCOLS;
ldpc.max_row_weight = HRA_112_112_MAX_ROW_WEIGHT;
ldpc.max_col_weight = HRA_112_112_MAX_COL_WEIGHT;
ldpc.H_rows = (uint16_t *)HRA_112_112_H_rows;
ldpc.H_cols = (uint16_t *)HRA_112_112_H_cols;
/* Main Loop
* ---------------------------------------------------------------------*/
for (f = 0; f < NFRAMES; f++) {
/* --------------------------------------------------------*\
Mod
\*---------------------------------------------------------*/
/* See CML startup code in tofdm.m */
for (i = 0; i < ofdm_nuwbits; i++) {
tx_bits[i] = ofdm->tx_uw[i];
}
for (i = ofdm_nuwbits; i < ofdm_nuwbits + ofdm_ntxtbits; i++) {
tx_bits[i] = 0;
}
if (ldpc_enable) {
unsigned char ibits[HRA_112_112_NUMBERROWSHCOLS];
unsigned char pbits[HRA_112_112_NUMBERPARITYBITS];
assert(HRA_112_112_NUMBERROWSHCOLS == ldpc.CodeLength / 2);
for (i = 0; i < ldpc.CodeLength / 2; i++) {
ibits[i] = payload_data_bits[i];
}
encode(&ldpc, ibits, pbits);
for (j = 0, i = ofdm_nuwbits + ofdm_ntxtbits; j < ldpc.CodeLength / 2;
i++, j++) {
tx_bits[i] = ibits[j];
}
for (j = 0; j < ldpc.CodeLength / 2; i++, j++) {
tx_bits[i] = pbits[j];
}
assert(i == ofdm_bitsperframe);
} else {
int Npayloadbits = ofdm_bitsperframe - (ofdm_nuwbits + ofdm_ntxtbits);
uint16_t r[Npayloadbits];
uint8_t payload_bits[Npayloadbits];
ofdm_rand(r, Npayloadbits);
for (i = 0; i < Npayloadbits; i++) payload_bits[i] = r[i] > 16384;
uint8_t txt_bits[ofdm_ntxtbits];
for (i = 0; i < ofdm_ntxtbits; i++) txt_bits[i] = 0;
uint8_t tx_bits_char[ofdm_bitsperframe];
ofdm_assemble_qpsk_modem_packet(ofdm, tx_bits_char, payload_bits,
txt_bits);
for (i = 0; i < ofdm_bitsperframe; i++) tx_bits[i] = tx_bits_char[i];
}
ofdm_mod(ofdm, (COMP *)tx, tx_bits);
/* tx vector logging */
memcpy(&tx_bits_log[ofdm_bitsperframe * f], tx_bits,
sizeof(int) * ofdm_bitsperframe);
memcpy(&tx_log[ofdm_samplesperframe * f], tx,
sizeof(COMP) * ofdm_samplesperframe);
}
/* --------------------------------------------------------*\
Channel
\*---------------------------------------------------------*/
fs_offset(rx_log, tx_log, ofdm_samplesperframe * NFRAMES,
SAMPLE_CLOCK_OFFSET_PPM);
COMP foff_phase_rect = {1.0f, 0.0f};
freq_shift(rx_log, rx_log, FOFF_HZ, &foff_phase_rect,
ofdm_samplesperframe * NFRAMES);
/* --------------------------------------------------------*\
Demod
\*---------------------------------------------------------*/
/* Init/pre-load rx with ideal timing so we can test with timing estimation
* disabled */
int Nsam = ofdm_samplesperframe * NFRAMES;
int prx = 0;
int nin = ofdm_samplesperframe + 2 * ofdm_samplespersymbol;
int lnew;
COMP rxbuf_in[ofdm_max_samplesperframe];
#define FRONT_LOAD
#ifdef FRONT_LOAD
for (i = 0; i < nin; i++, prx++) {
ofdm->rxbuf[ofdm_nrxbuf - nin + i] =
rx_log[prx].real + rx_log[prx].imag * I;
}
#endif
int nin_tot = 0;
/* disable estimators for initial testing */
ofdm_set_verbose(ofdm, false);
ofdm_set_timing_enable(ofdm, true);
ofdm_set_foff_est_enable(ofdm, true);
ofdm_set_phase_est_enable(ofdm, true);
//#define TESTING_FILE
#ifdef TESTING_FILE
FILE *fin = fopen("~/codec2-dev/octave/ofdm_test.raw", "rb");
assert(fin != NULL);
int Nbitsperframe = ofdm_bitsperframe;
int Nmaxsamperframe = ofdm_max_samplesperframe;
short rx_scaled[Nmaxsamperframe];
#endif
/* start this with something sensible otherwise LDPC decode fails in tofdm.m
*/
ofdm->mean_amp = 1.0;
for (f = 0; f < NFRAMES; f++) {
/* For initial testing, timing est is off, so nin is always
fixed. TODO: we need a constant for rxbuf_in[] size that
is the maximum possible nin */
nin = ofdm_get_nin(ofdm);
assert(nin <= ofdm_max_samplesperframe);
/* Insert samples at end of buffer, set to zero if no samples
available to disable phase estimation on future pilots on
last frame of simulation. */
if ((Nsam - prx) < nin) {
lnew = Nsam - prx;
} else {
lnew = nin;
}
// printf("nin: %d prx: %d lnew: %d\n", nin, prx, lnew);
for (i = 0; i < nin; i++) {
rxbuf_in[i].real = 0.0;
rxbuf_in[i].imag = 0.0;
}
if (lnew) {
for (i = 0; i < lnew; i++, prx++) {
rxbuf_in[i] = rx_log[prx];
}
}
assert(prx <= ofdm_max_samplesperframe * NFRAMES);
#ifdef TESTING_FILE
fread(rx_scaled, sizeof(short), nin, fin);
for (i = 0; i < nin; i++) {
rxbuf_in[i].real = (float)rx_scaled[i] / ASCALE;
rxbuf_in[i].imag = 0.0;
}
#endif
/* uncoded OFDM modem ---------------------------------------*/
ofdm_demod(ofdm, rx_bits, rxbuf_in);
#ifdef TESTING_FILE
int Nerrs = 0;
for (i = 0; i < Nbitsperframe; i++) {
if (test_bits_ofdm[i] != rx_bits[i]) {
Nerrs++;
}
}
printf("f: %d Nerr: %d\n", f, Nerrs);
#endif
float symbol_likelihood[(CODED_BITSPERFRAME / ofdm_bps) * (1 << ofdm_bps)];
float bit_likelihood[CODED_BITSPERFRAME];
uint8_t out_char[CODED_BITSPERFRAME];
if (ldpc_enable) {
/* LDPC functions --------------------------------------*/
float EsNo = 10;
/* first few symbols are used for UW and txt bits, find start of (224,112)
* LDPC codeword */
assert((ofdm_nuwbits + ofdm_ntxtbits + CODED_BITSPERFRAME) ==
ofdm_bitsperframe);
COMP ldpc_codeword_symbols[(CODED_BITSPERFRAME / ofdm_bps)];
for (i = 0, j = (ofdm_nuwbits + ofdm_ntxtbits) / ofdm_bps;
i < (CODED_BITSPERFRAME / ofdm_bps); i++, j++) {
ldpc_codeword_symbols[i].real = crealf(ofdm->rx_np[j]);
ldpc_codeword_symbols[i].imag = cimagf(ofdm->rx_np[j]);
}
float *ldpc_codeword_symbol_amps =
&ofdm->rx_amp[(ofdm_nuwbits + ofdm_ntxtbits) / ofdm_bps];
Demod2D(symbol_likelihood, ldpc_codeword_symbols, S_matrix, EsNo,
ldpc_codeword_symbol_amps, ofdm->mean_amp,
CODED_BITSPERFRAME / ofdm_bps);
Somap(bit_likelihood, symbol_likelihood, 1 << ofdm_bps, ofdm_bps,
CODED_BITSPERFRAME / ofdm_bps);
float llr[CODED_BITSPERFRAME];
int parityCheckCount;
// fprintf(stderr, "\n");
for (i = 0; i < CODED_BITSPERFRAME; i++) {
llr[i] = -bit_likelihood[i];
// fprintf(stderr, "%f ", llr[i]);
}
// fprintf(stderr, "\n");
run_ldpc_decoder(&ldpc, out_char, llr, &parityCheckCount);
/*
fprintf(stderr, "iter: %d parityCheckCount: %d\n", iter,
parityCheckCount); for(i=0; i<CODED_BITSPERFRAME; i++) { fprintf(stderr,
"%d ", out_char[i]);
}
*/
}
/* rx vector logging -----------------------------------*/
assert(nin_tot < ofdm_samplesperframe * NFRAMES);
memcpy(&rxbuf_in_log[nin_tot], rxbuf_in, sizeof(COMP) * nin);
nin_tot += nin;
for (i = 0; i < ofdm_nrxbuf; i++) {
rxbuf_log[ofdm_nrxbuf * f + i].real = crealf(ofdm->rxbuf[i]);
rxbuf_log[ofdm_nrxbuf * f + i].imag = cimagf(ofdm->rxbuf[i]);
}
for (i = 0; i < (ofdm_ns + 3); i++) {
for (j = 0; j < (ofdm_nc + 2); j++) {
rx_sym_log[(ofdm_ns + 3) * f + i][j].real = crealf(ofdm->rx_sym[i][j]);
rx_sym_log[(ofdm_ns + 3) * f + i][j].imag = cimagf(ofdm->rx_sym[i][j]);
}
}
/* note corrected phase (rx no phase) is one big linear array for frame */
for (i = 0; i < ofdm_rowsperframe * ofdm_nc; i++) {
rx_np_log[ofdm_rowsperframe * ofdm_nc * f + i].real =
crealf(ofdm->rx_np[i]);
rx_np_log[ofdm_rowsperframe * ofdm_nc * f + i].imag =
cimagf(ofdm->rx_np[i]);
}
/* note phase/amp ests the same for each col, but check them all anyway */
for (i = 0; i < ofdm_rowsperframe; i++) {
for (j = 0; j < ofdm_nc; j++) {
phase_est_pilot_log[ofdm_rowsperframe * f + i][j] =
ofdm->aphase_est_pilot_log[ofdm_nc * i + j];
rx_amp_log[ofdm_rowsperframe * ofdm_nc * f + ofdm_nc * i + j] =
ofdm->rx_amp[ofdm_nc * i + j];
}
}
foff_hz_log[f] = ofdm->foff_est_hz;
timing_est_log[f] = ofdm->timing_est + 1; /* offset by 1 to match Octave */
timing_valid_log[f] = ofdm->timing_valid;
timing_mx_log[f] = ofdm->timing_mx;
coarse_foff_est_hz_log[f] = ofdm->coarse_foff_est_hz;
sample_point_log[f] =
ofdm->sample_point + 1; /* offset by 1 to match Octave */
float EsNodB = ofdm_esno_est_calc(ofdm->rx_np, ofdm_rowsperframe * ofdm_nc);
snr_log[f] = ofdm_snr_from_esno(ofdm, EsNodB);
mean_amp_log[f] = ofdm->mean_amp;
memcpy(&rx_bits_log[ofdm_bitsperframe * f], rx_bits, sizeof(rx_bits));
if (ldpc_enable) {
for (i = 0; i < (CODED_BITSPERFRAME / ofdm_bps) * (1 << ofdm_bps); i++) {
symbol_likelihood_log[(CODED_BITSPERFRAME / ofdm_bps) *
(1 << ofdm_bps) * f +
i] = symbol_likelihood[i];
}
for (i = 0; i < CODED_BITSPERFRAME; i++) {
bit_likelihood_log[CODED_BITSPERFRAME * f + i] = bit_likelihood[i];
detected_data_log[CODED_BITSPERFRAME * f + i] = out_char[i];
}
}
}
/*---------------------------------------------------------*\
Dump logs to Octave file for evaluation
by tofdm.m Octave script
\*---------------------------------------------------------*/
fout = fopen("tofdm_out.txt", "wt");
assert(fout != NULL);
fprintf(fout, "# Created by tofdm.c\n");
octave_save_complex(fout, "pilot_samples_c", (COMP *)ofdm->pilot_samples, 1,
ofdm_samplespersymbol, ofdm_samplespersymbol);
octave_save_int(fout, "tx_bits_log_c", tx_bits_log, 1,
ofdm_bitsperframe * NFRAMES);
octave_save_complex(fout, "tx_log_c", (COMP *)tx_log, 1,
ofdm_samplesperframe * NFRAMES,
ofdm_samplesperframe * NFRAMES);
octave_save_complex(fout, "rx_log_c", (COMP *)rx_log, 1,
ofdm_samplesperframe * NFRAMES,
ofdm_samplesperframe * NFRAMES);
octave_save_complex(fout, "rxbuf_in_log_c", (COMP *)rxbuf_in_log, 1, nin_tot,
nin_tot);
octave_save_complex(fout, "rxbuf_log_c", (COMP *)rxbuf_log, 1,
ofdm_nrxbuf * NFRAMES, ofdm_nrxbuf * NFRAMES);
octave_save_complex(fout, "rx_sym_log_c", (COMP *)rx_sym_log,
(ofdm_ns + 3) * NFRAMES, ofdm_nc + 2, ofdm_nc + 2);
octave_save_float(fout, "phase_est_pilot_log_c", (float *)phase_est_pilot_log,
ofdm_rowsperframe * NFRAMES, ofdm_nc, ofdm_nc);
octave_save_float(fout, "rx_amp_log_c", (float *)rx_amp_log, 1,
ofdm_rowsperframe * ofdm_nc * NFRAMES,
ofdm_rowsperframe * ofdm_nc * NFRAMES);
octave_save_float(fout, "foff_hz_log_c", foff_hz_log, NFRAMES, 1, 1);
octave_save_int(fout, "timing_est_log_c", timing_est_log, NFRAMES, 1);
octave_save_int(fout, "timing_valid_log_c", timing_valid_log, NFRAMES, 1);
octave_save_float(fout, "timing_mx_log_c", timing_mx_log, NFRAMES, 1, 1);
octave_save_float(fout, "coarse_foff_est_hz_log_c", coarse_foff_est_hz_log,
NFRAMES, 1, 1);
octave_save_int(fout, "sample_point_log_c", sample_point_log, NFRAMES, 1);
octave_save_complex(fout, "rx_np_log_c", (COMP *)rx_np_log, 1,
ofdm_rowsperframe * ofdm_nc * NFRAMES,
ofdm_rowsperframe * ofdm_nc * NFRAMES);
octave_save_int(fout, "rx_bits_log_c", rx_bits_log, 1,
ofdm_bitsperframe * NFRAMES);
octave_save_float(fout, "symbol_likelihood_log_c", symbol_likelihood_log,
(CODED_BITSPERFRAME / ofdm_bps) * (1 << ofdm_bps) * NFRAMES,
1, 1);
octave_save_float(fout, "bit_likelihood_log_c", bit_likelihood_log,
CODED_BITSPERFRAME * NFRAMES, 1, 1);
octave_save_int(fout, "detected_data_log_c", detected_data_log, 1,
CODED_BITSPERFRAME * NFRAMES);
octave_save_float(fout, "snr_log_c", snr_log, NFRAMES, 1, 1);
octave_save_float(fout, "mean_amp_log_c", mean_amp_log, NFRAMES, 1, 1);
fclose(fout);
#ifdef TESTING_FILE
fclose(fin);
#endif
ofdm_destroy(ofdm);
return 0;
}
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