int sync_init(sync_t *q, int frame_size) {
int N_id_2;
bzero(q, sizeof(sync_t));
q->force_N_id_2 = -1;
q->threshold = 1.5;
q->pss_mode = PEAK_MEAN;
q->detect_cp = true;
q->sss_en = true;
for (N_id_2=0;N_id_2<3;N_id_2++) {
if (pss_synch_init(&q->pss[N_id_2], frame_size)) {
fprintf(stderr, "Error initializing PSS object\n");
return -1;
}
if (pss_synch_set_N_id_2(&q->pss[N_id_2], N_id_2)) {
fprintf(stderr, "Error initializing N_id_2\n");
return -1;
}
if (sss_synch_init(&q->sss[N_id_2])) {
fprintf(stderr, "Error initializing SSS object\n");
return -1;
}
if (sss_synch_set_N_id_2(&q->sss[N_id_2], N_id_2)) {
fprintf(stderr, "Error initializing N_id_2\n");
return -1;
}
DEBUG("PSS and SSS initiated N_id_2=%d\n", N_id_2);
}
return 0;
}
int sss_synch_initialize(sss_synch_hl* h) {
if (sss_synch_init(&h->obj, 128)) {
return LIBLTE_ERROR;
}
sss_synch_set_N_id_2(&h->obj, h->init.N_id_2);
return LIBLTE_SUCCESS;
}
int sss_synch_initialize(sss_synch_hl* h) {
if (sss_synch_init(&h->obj)) {
return -1;
}
sss_synch_set_N_id_2(&h->obj, h->init.N_id_2);
return 0;
}
/* Returns 1 if the SSS is found, 0 if not and -1 if there is not enough space
* to correlate
*/
int sync_sss(sync_t *q, cf_t *input, uint32_t peak_pos, lte_cp_t cp) {
int sss_idx, ret;
sss_synch_set_N_id_2(&q->sss, q->N_id_2);
/* Make sure we have enough room to find SSS sequence */
sss_idx = (int) peak_pos-2*q->fft_size-CP(q->fft_size, (CP_ISNORM(q->cp)?CPNORM_LEN:CPEXT_LEN));
if (sss_idx < 0) {
INFO("Not enough room to decode CP SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx, peak_pos);
return LIBLTE_ERROR;
}
DEBUG("Searching SSS around sss_idx: %d, peak_pos: %d\n", sss_idx, peak_pos);
switch(q->sss_alg) {
case SSS_DIFF:
sss_synch_m0m1_diff(&q->sss, &input[sss_idx], &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
case SSS_PARTIAL_3:
sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 3, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
case SSS_FULL:
sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 1, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
}
q->sf_idx = sss_synch_subframe(q->m0, q->m1);
ret = sss_synch_N_id_1(&q->sss, q->m0, q->m1);
if (ret >= 0) {
q->N_id_1 = (uint32_t) ret;
DEBUG("SSS detected N_id_1=%d, sf_idx=%d, %s CP\n",
q->N_id_1, q->sf_idx, CP_ISNORM(q->cp)?"Normal":"Extended");
return 1;
} else {
q->N_id_1 = 1000;
return LIBLTE_SUCCESS;
}
}
