int main()
{
char input[] = "Hello, World!";
int length = strlen(input);
char output[length];
char reverse[length];
int i;
output[length] = '\0';
reverse[length] = '\0';
printf("Input is: \"%s\".\n", input);
printf("Input contains %i bytes.\n", length);
for (i = 0; i < length; i++) {
output[i] = gray_encode(input[i]);
}
printf("Output is: \"%s\".\n", output);
printf("Now back the other way!\n");
for (i = 0; i < length; i++) {
reverse[i] = gray_decode(output[i]);
}
printf("Reversed output is: \"%s\".\n", reverse);
char c;
printf("\nSTDIN: ");
while ((c = fgetc(stdin)) != EOF) {
printf("%c", c);
}
return 0;
}
q->modulate_using_map = 1;
// initialize soft-demodulation look-up table
if (q->m >= 3)
MODEM(_demodsoft_gentab)(q, 2);
return q;
}
// modulate PSK
void MODEM(_modulate_psk)(MODEM() _q,
unsigned int _sym_in,
TC * _y)
{
// 'encode' input symbol (actually gray decoding)
_sym_in = gray_decode(_sym_in);
// compute output sample
*_y = liquid_cexpjf(_sym_in * 2 * _q->data.psk.alpha );
}
// demodulate PSK
void MODEM(_demodulate_psk)(MODEM() _q,
TC _x,
unsigned int * _sym_out)
{
// compute angle and subtract phase offset, ensuring phase is in [-pi,pi)
T theta = cargf(_x);
theta -= _q->data.psk.d_phi;
if (theta < -M_PI)
theta += 2*M_PI;