1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/*---------------------------------------------------------------------------*\
FILE........: tfsk_llr.c
AUTHOR......: David Rowe
DATE CREATED: July 2020
Simple test program for 4FSK LLR routines.
\*---------------------------------------------------------------------------*/
#include <math.h>
#include <stdio.h>
#include "mpdecode_core.h"
#define M 4
#define BPS 2
#define NSYM 5
#define V_EST 2
#define SNR_EST 10
/* Generated test vectors with:
octave:100> init_cml('~/cml/');
octave:101> rx_filt=[1 0 0 0; 0 1 0 0; 0 0 1 0; 0 0 0 1]
octave:102> symL = DemodFSK(rx_filt,10,1); -Somap(symL)
*/
/* one col per symbol:
0 1 2 3 4 */
float rx_filt[] = {
1.0, 0.0, 0.0, 0.0, 1.0, /* filter 0 */
0.0, 1.0, 0.0, 0.0, 0.0, /* filter 1 */
0.0, 0.0, 1.0, 0.0, 0.0, /* filter 2 */
0.0, 0.0, 0.0, 1.0, 0.0 /* filter 3 */
};
float llrs_target[] = {7.3252, 7.3252, /* bit 0, 1 */
7.3252, -7.3252, /* 2, 3, ... */
-7.3252, 7.3252, -7.3252, -7.3252, 7.3252, 7.3252};
int main(void) {
float llrs[BPS * NSYM] = {0};
fsk_rx_filt_to_llrs(llrs, rx_filt, V_EST, SNR_EST, M, NSYM);
float error = 0.0;
for (int i = 0; i < NSYM * BPS; i++) {
fprintf(stderr, "% f\n", llrs[i]);
error += pow(llrs[i] - llrs_target[i], 2.0);
}
if (error < 1E-3) {
fprintf(stderr, "PASS\n");
return 0;
} else {
fprintf(stderr, "FAIL\n");
return 1;
}
}
|
