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/*---------------------------------------------------------------------------*\
FILE........: ofdm_put_test_bits.c
AUTHOR......: David Rowe
DATE CREATED: Mar 2018
Slurps up a stream of test bits generated by ofdm_get_test_bits, useful for
testing ofdm_mod and ofdm_demod.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2018 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 2.1, 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include "codec2_ofdm.h"
#include "ofdm_internal.h"
#include "test_bits_ofdm.h"
#define LOG_FRAMES 100
#define NDISCARD 20
static struct OFDM *ofdm;
int opt_exists(char *argv[], int argc, char opt[]) {
int i;
for (i=0; i<argc; i++) {
if (strcmp(argv[i], opt) == 0) {
return i;
}
}
return 0;
}
int main(int argc, char *argv[])
{
FILE *fin;
int i, f, Nerrs, Terrs, Tbits, Terrs2, Tbits2, verbose;
float aber;
if (argc < 2) {
fprintf(stderr, "\n");
fprintf(stderr, "usage: %s InputOneCharPerBitFile [-v]\n", argv[0]);
fprintf(stderr, "\n");
exit(1);
}
if (strcmp(argv[1], "-") == 0)
fin = stdin;
else if ( (fin = fopen(argv[1],"rb")) == NULL ) {
fprintf(stderr, "Error opening input file: %s: %s.\n",
argv[1], strerror(errno));
exit(1);
}
verbose = 0;
if (opt_exists(argv, argc, "-v")) {
verbose = 1;
}
ofdm = ofdm_create(NULL);
assert(ofdm != NULL);
int Nbitsperframe = ofdm_get_bits_per_frame(ofdm);
char rx_bits[Nbitsperframe];
f = Terrs = Tbits = Terrs2 = Tbits2 = 0;
while (fread(rx_bits, sizeof(char), Nbitsperframe, fin) == Nbitsperframe) {
f++;
Nerrs = 0;
for(i=0; i<Nbitsperframe; i++) {
if (test_bits_ofdm[i] != rx_bits[i]) {
Nerrs++;
}
}
aber = (float)Nerrs/Nbitsperframe;
Terrs += Nerrs;
Tbits += Nbitsperframe;
if (f >= NDISCARD) {
Terrs2 += Nerrs;
Tbits2 += Nbitsperframe;
}
if (verbose) {
printf("f: %d Nerrs: %d aber: %3.2f\n", f, Nerrs, aber);
}
}
fclose(fin);
fprintf(stderr, "BER..: %5.4f Tbits: %5d Terrs: %5d\n", (float)Terrs/Tbits, Tbits, Terrs);
if (Tbits2 != 0) {
fprintf(stderr, "BER2.: %5.4f Tbits: %5d Terrs: %5d\n", (float)Terrs2/Tbits2, Tbits2, Terrs2);
}
ofdm_destroy(ofdm);
return 0;
}
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