/**
* @ingroup gen_hard_demod
*
* Main DSP function
*
* Calls the appropriate function for demodulating all recevied symbols.
*
* \param inp Input interface buffers. The value inp[i] points to the buffer received
* from the i-th interface. The function get_input_samples(i) returns the number of received
* samples (the sample size is by default sizeof(input_t))
*
* \param out Output interface buffers. The value out[i] points to the buffer where the samples
* to be sent through the i-th interfaces must be stored.
*
* @return On success, returns a non-negative number indicating the output
* samples that should be transmitted through all output interface. To specify a different length
* for certain interface, use the function set_output_samples(int idx, int len)
* On error returns -1.
*
*
*/
int work(void **inp, void **out) {
int rcv_samples, snd_samples;
int modulation;
int bits_per_symbol;
input_t *input;
output_t *output;
float *inreal;
if (!get_input_samples(0)) {
return 0;
}
/* Dynamically obtain modulation type */
if (param_get_int(modulation_id, &modulation) != 1) {
moderror("Error getting 'modulation' parameter. Assuming BPSK.\n");
modulation = BPSK;
}
/* Verify parameters */
if ((modulation != BPSK) && (modulation != QPSK) && (modulation != QAM16) && (modulation != QAM64)) {
moderror_msg("Invalid modulation %d. Specify 1 for BPSK, 2 for QPSK,"
"4 for 16QAM, or 6 for 64QAM\n", modulation);
return -1;
}
input = inp[0];
output = out[0];
rcv_samples = get_input_samples(0); /* number of input samples */
bits_per_symbol = get_bits_per_symbol(modulation);
if (in_real) {
inreal = inp[0];
hard_demod_real(inreal, output, rcv_samples, modulation);
} else {
hard_demod(input, output, rcv_samples, modulation);
}
snd_samples = rcv_samples*bits_per_symbol;
return snd_samples;
}
/**
* @ingroup gen_hard_demod
*
* Main DSP function
*
* Calls the appropriate function for demodulating all recevied symbols.
*
* \param inp Input interface buffers. The value inp[i] points to the buffer received
* from the i-th interface. The function get_input_samples(i) returns the number of received
* samples (the sample size is by default sizeof(input_t))
*
* \param out Output interface buffers. The value out[i] points to the buffer where the samples
* to be sent through the i-th interfaces must be stored.
*
* @return On success, returns a non-negative number indicating the output
* samples that should be transmitted through all output interface. To specify a different length
* for certain interface, use the function set_output_samples(int idx, int len)
* On error returns -1.
*
*
*/
int work(void **inp, void **out) {
int i;
int rcv_samples, snd_samples;
int modulation;
float sigma2;
int bits_per_symbol;
input_t *input;
output_t *output;
/* Dynamically obtain modulation type */
if (param_get_int(modulation_id, &modulation) != 1) {
moderror("Error getting 'modulation' parameter. Assuming QPSK.\n");
modulation = QPSK;
}
/* Verify parameters */
if (modulation > 3 || modulation < 0) {
moderror_msg("Invalid modulation %d. Specify 0 for BPSK, 1 for QPSK,"
"2 for 16QAM, or 3 for 64QAM\n", modulation);
return -1;
} else {
modinfo_msg("Modulation type is %d (0:BPSK; 1:QPSK; 2:16QAM;"
"3:64QAM)\n",modulation);
}
input = inp[0];
output = out[0];
rcv_samples = get_input_samples(0); /* number of input samples */
bits_per_symbol = get_bits_per_symbol(modulation);
hard_demod(input, output, rcv_samples, modulation);
snd_samples = rcv_samples*bits_per_symbol;
/* printf("\n\n");
for (i=0; i<snd_samples; i++) {
printf("%d",output[i]);
}
*/
return snd_samples;
}
