Commit 2c75720d authored by Francesco Mani's avatar Francesco Mani
Browse files

multiple ssb detection via pbch dmrs (ordered list)

parent 3fc4c6a4
......@@ -54,15 +54,61 @@ int cnt=0;
#define DEBUG_INITIAL_SYNCH
// create a new node of SSB structure
NR_UE_SSB* create_ssb_node(uint8_t i, uint8_t h) {
NR_UE_SSB *new_node = (NR_UE_SSB*)malloc(sizeof(NR_UE_SSB));
new_node->i_ssb = i;
new_node->n_hf = h;
new_node->c_re = 0;
new_node->c_im = 0;
new_node->metric = 0;
new_node->next_ssb = NULL;
return new_node;
}
// insertion of the structure in the ordered list (highest metric first)
NR_UE_SSB* insert_into_list(NR_UE_SSB *head, NR_UE_SSB *node) {
if (node->metric > head->metric) {
node->next_ssb = head;
head = node;
return head;
}
NR_UE_SSB *current = head;
while (current->next_ssb !=NULL) {
NR_UE_SSB *temp=current->next_ssb;
if(node->metric > current->metric) {
node->next_ssb = temp;
current->next_ssb = node;
return head;
}
else
current = temp;
}
current->next_ssb = node;
return head;
}
void free_list(NR_UE_SSB *node) {
if (node->next_ssb != NULL)
free_list(node->next_ssb);
free(node);
}
int nr_pbch_detection(PHY_VARS_NR_UE *ue, int pbch_initial_symbol, runmode_t mode)
{
NR_DL_FRAME_PARMS *frame_parms=&ue->frame_parms;
int ret =-1;
uint8_t best_ssb =0;
uint8_t n_hf =0;
uint32_t best_metric =0;
NR_UE_SSB *current_ssb = malloc(sizeof(NR_UE_SSB));
NR_UE_SSB *best_ssb = NULL;
NR_UE_SSB *current_ssb;
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync: starting PBCH detection (rx_offset %d)\n",ue->Mod_id,
......@@ -76,11 +122,8 @@ int nr_pbch_detection(PHY_VARS_NR_UE *ue, int pbch_initial_symbol, runmode_t mod
for (int hf = 0; hf < N_hf; hf++) {
for (int l = 0; l < N_L ; l++) {
// initialization of structure parameters
current_ssb->n_hf = hf;
current_ssb->i_ssb = l;
current_ssb->c_re = 0;
current_ssb->c_im = 0;
// initialization of structure
current_ssb = create_ssb_node(l,hf);
#if UE_TIMING_TRACE
start_meas(&ue->dlsch_channel_estimation_stats);
......@@ -94,34 +137,42 @@ int nr_pbch_detection(PHY_VARS_NR_UE *ue, int pbch_initial_symbol, runmode_t mod
current_ssb->metric = current_ssb->c_re*current_ssb->c_re + current_ssb->c_im+current_ssb->c_re;
if(current_ssb->metric > best_metric) { // if metric of current structure is higher than the best one
best_metric = current_ssb->metric;
best_ssb = l;
n_hf = hf;
}
// generate a list of SSB structures
if (best_ssb == NULL)
best_ssb = current_ssb;
else
best_ssb = insert_into_list(best_ssb,current_ssb);
}
}
NR_UE_SSB *temp_ptr=best_ssb;
while (ret!=0 && temp_ptr != NULL) {
#if UE_TIMING_TRACE
start_meas(&ue->dlsch_channel_estimation_stats);
start_meas(&ue->dlsch_channel_estimation_stats);
#endif
// computing channel estimation for selected best ssb
for(int i=pbch_initial_symbol; i<pbch_initial_symbol+3;i++)
nr_pbch_channel_estimation(ue,0,0,i,i-pbch_initial_symbol,best_ssb,n_hf);
for(int i=pbch_initial_symbol; i<pbch_initial_symbol+3;i++)
nr_pbch_channel_estimation(ue,0,0,i,i-pbch_initial_symbol,best_ssb->i_ssb,best_ssb->n_hf);
#if UE_TIMING_TRACE
stop_meas(&ue->dlsch_channel_estimation_stats);
stop_meas(&ue->dlsch_channel_estimation_stats);
#endif
ret = nr_rx_pbch(ue,
&ue->proc.proc_rxtx[0],
ue->pbch_vars[0],
frame_parms,
0,
best_ssb,
SISO,
ue->high_speed_flag);
ret = nr_rx_pbch(ue,
&ue->proc.proc_rxtx[0],
ue->pbch_vars[0],
frame_parms,
0,
temp_ptr->i_ssb,
SISO,
ue->high_speed_flag);
temp_ptr=temp_ptr->next_ssb;
}
free_list(best_ssb);
if (ret==0) {
frame_parms->nb_antenna_ports_eNB = 1; //pbch_tx_ant;
......@@ -144,7 +195,6 @@ int nr_pbch_detection(PHY_VARS_NR_UE *ue, int pbch_initial_symbol, runmode_t mod
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync: pbch decoded sucessfully\n",ue->Mod_id);
#endif
return(0);
} else {
return(-1);
......
......@@ -957,6 +957,7 @@ typedef struct NR_UE_SSB {
uint32_t metric; // metric to order SSB hypothesis
uint32_t c_re;
uint32_t c_im;
struct NR_UE_SSB *next_ssb;
} NR_UE_SSB;
/*typedef enum {
......@@ -1088,7 +1089,7 @@ typedef struct {
uint32_t nr_gold_pbch[2][64][NR_PBCH_DMRS_LENGTH_DWORD];
/// PDSCH DMRS
uint32_t nr_gold_pdsch[2][20][2][21];
uint32_t nr_gold_pdsch[2][20][2][52];
/// PDCCH DMRS
uint32_t nr_gold_pdcch[7][20][3][52];
......
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