int init_sequence(sequence_t *seq, char *name) {
if (!strcmp(name, "PBCH")) {
return sequence_pbch(seq, cp, cell_id);
} else {
fprintf(stderr, "Unsupported sequence name %s\n", name);
return -1;
}
}
int compute_sequences(scrambling_hl* h) {
switch (h->init.channel) {
case PBCH:
return sequence_pbch(&h->obj.seq[0], h->init.nof_symbols == CPNORM_NSYMB,
h->init.cell_id);
case PDSCH:
case PCFICH:
case PDCCH:
case PMCH:
case PUCCH:
fprintf(stderr, "Not implemented\n");
return -1;
default:
fprintf(stderr, "Invalid channel %d\n", h->init.channel);
return -1;
}
}
/** Initializes the PBCH transmitter and receiver.
* At the receiver, the field nof_ports in the cell structure indicates the
* maximum number of BS transmitter ports to look for.
*/
int pbch_init(pbch_t *q, lte_cell_t cell) {
int ret = LIBLTE_ERROR_INVALID_INPUTS;
if (q != NULL &&
lte_cell_isvalid(&cell))
{
ret = LIBLTE_ERROR;
bzero(q, sizeof(pbch_t));
q->cell = cell;
if (modem_table_lte(&q->mod, LTE_QPSK, true)) {
goto clean;
}
demod_soft_init(&q->demod);
demod_soft_table_set(&q->demod, &q->mod);
demod_soft_alg_set(&q->demod, APPROX);
if (sequence_pbch(&q->seq_pbch, q->cell.cp, q->cell.id)) {
goto clean;
}
uint32_t poly[3] = { 0x6D, 0x4F, 0x57 };
if (viterbi_init(&q->decoder, viterbi_37, poly, 40, true)) {
goto clean;
}
if (crc_init(&q->crc, LTE_CRC16, 16)) {
goto clean;
}
q->encoder.K = 7;
q->encoder.R = 3;
q->encoder.tail_biting = true;
memcpy(q->encoder.poly, poly, 3 * sizeof(int));
q->nof_symbols = (CP_ISNORM(q->cell.cp)) ? PBCH_RE_CPNORM : PBCH_RE_CPEXT;
q->pbch_d = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_d) {
goto clean;
}
int i;
for (i = 0; i < q->cell.nof_ports; i++) {
q->ce[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->ce[i]) {
goto clean;
}
q->pbch_x[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_x[i]) {
goto clean;
}
q->pbch_symbols[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_symbols[i]) {
goto clean;
}
}
q->pbch_llr = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->pbch_llr) {
goto clean;
}
q->temp = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->temp) {
goto clean;
}
q->pbch_rm_f = malloc(sizeof(float) * 120);
if (!q->pbch_rm_f) {
goto clean;
}
q->pbch_rm_b = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->pbch_rm_b) {
goto clean;
}
q->data = malloc(sizeof(char) * 40);
if (!q->data) {
goto clean;
}
q->data_enc = malloc(sizeof(char) * 120);
if (!q->data_enc) {
goto clean;
}
ret = LIBLTE_SUCCESS;
}
clean:
if (ret == LIBLTE_ERROR) {
pbch_free(q);
}
return ret;
}
/** Initializes the PBCH transmitter and receiver */
int pbch_init(pbch_t *q, int nof_prb, int cell_id, lte_cp_t cp) {
int ret = -1;
if (cell_id < 0) {
return -1;
}
bzero(q, sizeof(pbch_t));
q->cell_id = cell_id;
q->cp = cp;
q->nof_prb = nof_prb;
if (modem_table_std(&q->mod, LTE_QPSK, true)) {
goto clean;
}
demod_soft_init(&q->demod);
demod_soft_table_set(&q->demod, &q->mod);
demod_soft_alg_set(&q->demod, APPROX);
if (sequence_pbch(&q->seq_pbch, q->cp, q->cell_id)) {
goto clean;
}
int poly[3] = { 0x6D, 0x4F, 0x57 };
if (viterbi_init(&q->decoder, viterbi_37, poly, 40, true)) {
goto clean;
}
if (crc_init(&q->crc, LTE_CRC16, 16)) {
goto clean;
}
q->encoder.K = 7;
q->encoder.R = 3;
q->encoder.tail_biting = true;
memcpy(q->encoder.poly, poly, 3 * sizeof(int));
q->nof_symbols = (CP_ISNORM(q->cp)) ? PBCH_RE_CPNORM : PBCH_RE_CPEXT;
q->pbch_d = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_d) {
goto clean;
}
int i;
for (i = 0; i < MAX_PORTS_CTRL; i++) {
q->ce[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->ce[i]) {
goto clean;
}
q->pbch_x[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_x[i]) {
goto clean;
}
q->pbch_symbols[i] = malloc(sizeof(cf_t) * q->nof_symbols);
if (!q->pbch_symbols[i]) {
goto clean;
}
}
q->pbch_llr = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->pbch_llr) {
goto clean;
}
q->temp = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->temp) {
goto clean;
}
q->pbch_rm_f = malloc(sizeof(float) * 120);
if (!q->pbch_rm_f) {
goto clean;
}
q->pbch_rm_b = malloc(sizeof(float) * q->nof_symbols * 4 * 2);
if (!q->pbch_rm_b) {
goto clean;
}
q->data = malloc(sizeof(char) * 40);
if (!q->data) {
goto clean;
}
q->data_enc = malloc(sizeof(char) * 120);
if (!q->data_enc) {
goto clean;
}
ret = 0;
clean: if (ret == -1) {
pbch_free(q);
}
return ret;
}
