int sss_synch_init(sss_synch_t *q, uint32_t fft_size) {
if (q != NULL &&
fft_size < 2048)
{
uint32_t N_id_2;
struct sss_tables sss_tables;
bzero(q, sizeof(sss_synch_t));
if (dft_plan(&q->dftp_input, fft_size, FORWARD, COMPLEX)) {
sss_synch_free(q);
return LIBLTE_ERROR;
}
q->fft_size = fft_size;
generate_N_id_1_table(q->N_id_1_table);
dft_plan_set_mirror(&q->dftp_input, true);
dft_plan_set_dc(&q->dftp_input, true);
for (N_id_2=0;N_id_2<3;N_id_2++) {
generate_sss_all_tables(&sss_tables, N_id_2);
convert_tables(&q->fc_tables[N_id_2], &sss_tables);
}
q->N_id_2 = 0;
return LIBLTE_SUCCESS;
}
return LIBLTE_ERROR_INVALID_INPUTS;
}
int pss_synch_init_N_id_2(cf_t *pss_signal_freq, uint32_t N_id_2, uint32_t fft_size) {
dft_plan_t plan;
cf_t pss_signal_pad[2048];
cf_t pss_signal_time[PSS_LEN];
int ret = LIBLTE_ERROR_INVALID_INPUTS;
if (lte_N_id_2_isvalid(N_id_2) &&
fft_size <= 2048)
{
pss_generate(pss_signal_time, N_id_2);
bzero(pss_signal_pad, fft_size * sizeof(cf_t));
bzero(pss_signal_freq, fft_size * sizeof(cf_t));
memcpy(&pss_signal_pad[(fft_size-PSS_LEN)/2], pss_signal_time, PSS_LEN * sizeof(cf_t));
if (dft_plan(&plan, fft_size, BACKWARD, COMPLEX)) {
return LIBLTE_ERROR;
}
dft_plan_set_mirror(&plan, true);
dft_plan_set_dc(&plan, true);
dft_plan_set_norm(&plan, true);
dft_run_c(&plan, pss_signal_pad, pss_signal_freq);
vec_conj_cc(pss_signal_freq, pss_signal_freq, fft_size);
vec_sc_prod_cfc(pss_signal_freq, 1.0/62.0, pss_signal_freq, fft_size);
dft_plan_free(&plan);
ret = LIBLTE_SUCCESS;
}
return ret;
}
int sss_synch_realloc(sss_synch_t *q, uint32_t fft_size) {
if (q != NULL &&
fft_size < 2048)
{
dft_plan_free(&q->dftp_input);
if (dft_plan(&q->dftp_input, fft_size, FORWARD, COMPLEX)) {
sss_synch_free(q);
return LIBLTE_ERROR;
}
dft_plan_set_mirror(&q->dftp_input, true);
dft_plan_set_dc(&q->dftp_input, true);
q->fft_size = fft_size;
return LIBLTE_SUCCESS;
}
return LIBLTE_ERROR_INVALID_INPUTS;
}