/** This function can be called in a subframe (1ms) basis */
int rm_conv_work(rm_conv_hl* hl) {
if (hl->init.direction) {
//rm_conv_tx(hl->input, hl->output, hl->in_len, hl->ctrl_in.S);
hl->out_len = hl->ctrl_in.S;
} else {
rm_conv_rx(hl->input, hl->output, hl->in_len, hl->ctrl_in.E);
hl->out_len = hl->ctrl_in.E;
}
return 0;
}
int pbch_decode_frame(pbch_t *q, pbch_mib_t *mib, uint32_t src, uint32_t dst, uint32_t n,
uint32_t nof_bits, uint32_t nof_ports) {
int j;
memcpy(&q->temp[dst * nof_bits], &q->pbch_llr[src * nof_bits],
n * nof_bits * sizeof(float));
/* descramble */
scrambling_f_offset(&q->seq_pbch, &q->temp[dst * nof_bits], dst * nof_bits,
n * nof_bits);
for (j = 0; j < dst * nof_bits; j++) {
q->temp[j] = RX_NULL;
}
for (j = (dst + n) * nof_bits; j < 4 * nof_bits; j++) {
q->temp[j] = RX_NULL;
}
/* unrate matching */
rm_conv_rx(q->temp, 4 * nof_bits, q->pbch_rm_f, 120);
/* FIXME: If channel estimates are zero, received LLR are NaN. Check and return error */
for (j = 0; j < 120; j++) {
if (isnan(q->pbch_rm_f[j]) || isinf(q->pbch_rm_f[j])) {
return 0;
}
}
/* decode */
viterbi_decode_f(&q->decoder, q->pbch_rm_f, q->data, 40);
int c = 0;
for (j = 0; j < 40; j++) {
c += q->data[j];
}
if (!c) {
c = 1;
}
if (!pbch_crc_check(q, q->data, nof_ports)) {
/* unpack MIB */
pbch_mib_unpack(q->data, mib);
mib->nof_ports = nof_ports;
mib->sfn += dst - src;
return 1;
} else {
return 0;
}
}