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srsRAN_4G
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Added SSS disable option to sync

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master
ismagom 11 years ago
parent b78c8bde4f
commit e1334ff028
2 changed files with 57 additions and 44 deletions
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4
lte/include/lte/sync/sync.h
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@ -61,6 +61,7 @@ typedef struct {
float cfo; float cfo;
lte_cp_t cp; lte_cp_t cp;
bool detect_cp; bool detect_cp;
bool sss_en;
}sync_t; }sync_t;
@ -81,6 +82,9 @@ void sync_pss_det_peak_to_avg(sync_t *q);
void sync_force_N_id_2(sync_t *q, int force_N_id_2); void sync_force_N_id_2(sync_t *q, int force_N_id_2);
/* Forces the synchronizer to skip CP detection (useful for tracking mode) */ /* Forces the synchronizer to skip CP detection (useful for tracking mode) */
void sync_force_cp(sync_t *q, lte_cp_t cp); void sync_force_cp(sync_t *q, lte_cp_t cp);
/* Enables/Disables SSS detection (useful for tracking mode) */
void sync_sss_en(sync_t *q, bool enabled);
/* Gets the slot id (0 or 10) */ /* Gets the slot id (0 or 10) */
int sync_get_slot_id(sync_t *q); int sync_get_slot_id(sync_t *q);

97
lte/lib/sync/src/sync.c
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@ -94,6 +94,10 @@ void sync_force_cp(sync_t *q, lte_cp_t cp) {
q->detect_cp = false; q->detect_cp = false;
} }
void sync_sss_en(sync_t *q, bool enabled) {
q->sss_en = enabled;
}
int sync_get_cell_id(sync_t *q) { int sync_get_cell_id(sync_t *q) {
if (q->N_id_1 >=0 && q->N_id_2 >= 0) { if (q->N_id_1 >=0 && q->N_id_2 >= 0) {
return q->N_id_1*3 + q->N_id_2; return q->N_id_1*3 + q->N_id_2;
@ -179,62 +183,67 @@ int sync_run(sync_t *q, cf_t *input) {
INFO("PSS peak detected N_id_2=%d, pos=%d peak=%.2f par=%.2f th=%.2f cfo=%.4f\n", N_id_2, INFO("PSS peak detected N_id_2=%d, pos=%d peak=%.2f par=%.2f th=%.2f cfo=%.4f\n", N_id_2,
peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->threshold, q->cfo); peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->threshold, q->cfo);
/* Make sure we have enough room to find SSS sequence */ if (q->sss_en) {
sss_idx_n = peak_pos[N_id_2]-2*(128+CP(128,CPNORM_LEN));
sss_idx_e = peak_pos[N_id_2]-2*(128+CP(128,CPEXT_LEN));
if (q->detect_cp) { /* Make sure we have enough room to find SSS sequence */
if (sss_idx_n < 0 || sss_idx_e < 0) { sss_idx_n = peak_pos[N_id_2]-2*(128+CP(128,CPNORM_LEN));
INFO("Not enough room to decode SSS (%d, %d)\n", sss_idx_n, sss_idx_e); sss_idx_e = peak_pos[N_id_2]-2*(128+CP(128,CPEXT_LEN));
return -1;
} if (q->detect_cp) {
} else { if (sss_idx_n < 0 || sss_idx_e < 0) {
if (CP_ISNORM(q->cp)) { INFO("Not enough room to decode SSS (%d, %d)\n", sss_idx_n, sss_idx_e);
if (sss_idx_n < 0) {
INFO("Not enough room to decode SSS (%d)\n", sss_idx_n);
return -1; return -1;
} }
} else { } else {
if (sss_idx_e < 0) { if (CP_ISNORM(q->cp)) {
INFO("Not enough room to decode SSS (%d)\n", sss_idx_e); if (sss_idx_n < 0) {
return -1; INFO("Not enough room to decode SSS (%d)\n", sss_idx_n);
return -1;
}
} else {
if (sss_idx_e < 0) {
INFO("Not enough room to decode SSS (%d)\n", sss_idx_e);
return -1;
}
} }
} }
}
/* try Normal CP length */ /* try Normal CP length */
if (q->detect_cp || CP_ISNORM(q->cp)) { if (q->detect_cp || CP_ISNORM(q->cp)) {
sss_synch_m0m1(&q->sss[N_id_2], &input[sss_idx_n], sss_synch_m0m1(&q->sss[N_id_2], &input[sss_idx_n],
&m0, &m0_value_n, &m1, &m1_value_n); &m0, &m0_value_n, &m1, &m1_value_n);
slot_id_n = 2 * sss_synch_subframe(m0, m1); slot_id_n = 2 * sss_synch_subframe(m0, m1);
N_id_1_n = sss_synch_N_id_1(&q->sss[N_id_2], m0, m1); N_id_1_n = sss_synch_N_id_1(&q->sss[N_id_2], m0, m1);
} }
if (q->detect_cp || CP_ISEXT(q->cp)) { if (q->detect_cp || CP_ISEXT(q->cp)) {
/* Now try Extended CP length */ /* Now try Extended CP length */
sss_synch_m0m1(&q->sss[N_id_2], &input[sss_idx_e], sss_synch_m0m1(&q->sss[N_id_2], &input[sss_idx_e],
&m0, &m0_value_e, &m1, &m1_value_e); &m0, &m0_value_e, &m1, &m1_value_e);
slot_id_e = 2 * sss_synch_subframe(m0, m1); slot_id_e = 2 * sss_synch_subframe(m0, m1);
N_id_1_e = sss_synch_N_id_1(&q->sss[N_id_2], m0, m1); N_id_1_e = sss_synch_N_id_1(&q->sss[N_id_2], m0, m1);
} }
/* Correlation with extended CP hypoteshis is greater than with normal? */ /* Correlation with extended CP hypoteshis is greater than with normal? */
if ((q->detect_cp && m0_value_e * m1_value_e > m0_value_n * m1_value_n) if ((q->detect_cp && m0_value_e * m1_value_e > m0_value_n * m1_value_n)
|| CP_ISEXT(q->cp)) { || CP_ISEXT(q->cp)) {
q->cp = CPEXT; q->cp = CPEXT;
q->slot_id = slot_id_e; q->slot_id = slot_id_e;
q->N_id_1 = N_id_1_e; q->N_id_1 = N_id_1_e;
/* then is normal CP */ /* then is normal CP */
} else { } else {
q->cp = CPNORM; q->cp = CPNORM;
q->slot_id = slot_id_n; q->slot_id = slot_id_n;
q->N_id_1 = N_id_1_n; q->N_id_1 = N_id_1_n;
}
q->N_id_2 = N_id_2;
INFO("SSS detected N_id_1=%d, slot_idx=%d, %s CP\n",
q->N_id_1, q->slot_id, CP_ISNORM(q->cp)?"Normal":"Extended");
} }
q->N_id_2 = N_id_2;
INFO("SSS detected N_id_1=%d, slot_idx=%d, %s CP\n",
q->N_id_1, q->slot_id, CP_ISNORM(q->cp)?"Normal":"Extended");
return peak_pos[N_id_2]; return peak_pos[N_id_2];
} else { } else {

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