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Refactor pss_search_time_nr() with configurable search window

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Add search_start and search_length parameters to pss_search_time_nr()
to support targeted PSS searches within specific time windows.
This commit is contained in:
alexjiao
2026-01-09 11:25:16 +08:00
parent 13933f9db8
commit dfd3ad267e
2 changed files with 53 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/PHY/NR_REFSIG/pss_nr.h
+12
View File
@@ -86,6 +86,18 @@ int pss_synchro_nr(const c16_t **rxdata,
int *f_off,
int *pssPeak,
int *pssAvg);
int pss_search_time_nr(const c16_t **rxdata,
const NR_DL_FRAME_PARMS *frame_parms,
const c16_t pssTime[NUMBER_PSS_SEQUENCE][frame_parms->ofdm_symbol_size],
bool fo_flag,
int is,
int target_Nid_cell,
int *nid2,
int *f_off,
int *pssPeak,
int *pssAvg,
int search_start,
int search_length);
void generate_pss_nr_time(const NR_DL_FRAME_PARMS *fp, const int N_ID_2, int ssbFirstSCS, c16_t pssTime[fp->ofdm_symbol_size]);
int16_t *get_primary_synchro_nr2(const int nid2);
openair1/PHY/NR_UE_TRANSPORT/pss_nr.c
+23 -13
View File
@@ -50,7 +50,7 @@
//#define DBG_PSS_NR
static time_stats_t generic_time[TIME_LAST];
static int pss_search_time_nr(const c16_t **rxdata,
int pss_search_time_nr(const c16_t **rxdata,
const NR_DL_FRAME_PARMS *frame_parms,
const c16_t pssTime[NUMBER_PSS_SEQUENCE][frame_parms->ofdm_symbol_size],
bool fo_flag,
@@ -59,7 +59,9 @@ static int pss_search_time_nr(const c16_t **rxdata,
int *nid2,
int *f_off,
int *pssPeak,
int *pssAvg);
int *pssAvg,
int search_start,
int search_length);
static int16_t primary_synchro_nr2[NUMBER_PSS_SEQUENCE][LENGTH_PSS_NR] = {0};
static c16_t primary_synchro[NUMBER_PSS_SEQUENCE][LENGTH_PSS_NR] = {0};
@@ -407,7 +409,7 @@ int pss_synchro_nr(const c16_t **rxdata,
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PSS_SEARCH_TIME_NR, VCD_FUNCTION_IN);
int synchro_position =
pss_search_time_nr(rxdata, frame_parms, pssTime, fo_flag, is, target_Nid_cell, nid2, f_off, pssPeak, pssAvg);
pss_search_time_nr(rxdata, frame_parms, pssTime, fo_flag, is, target_Nid_cell, nid2, f_off, pssPeak, pssAvg, -1, -1);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PSS_SEARCH_TIME_NR, VCD_FUNCTION_OUT);
@@ -496,7 +498,7 @@ int pss_synchro_nr(const c16_t **rxdata,
*
*********************************************************************/
static int pss_search_time_nr(const c16_t **rxdata,
int pss_search_time_nr(const c16_t **rxdata,
const NR_DL_FRAME_PARMS *frame_parms,
const c16_t pssTime[NUMBER_PSS_SEQUENCE][frame_parms->ofdm_symbol_size],
bool fo_flag,
@@ -505,21 +507,29 @@ static int pss_search_time_nr(const c16_t **rxdata,
int *nid2,
int *f_off,
int *pssPeak,
int *pssAvg)
int *pssAvg,
int search_start,
int search_length)
{
unsigned int n, ar, peak_position, pss_source;
int64_t peak_value;
int64_t avg[NUMBER_PSS_SEQUENCE] = {0};
double ffo_est = 0;
// performing the correlation on a frame length plus one symbol for the first of the two frame
// to take into account the possibility of PSS in between the two frames
unsigned int length;
if (is==0)
length = frame_parms->samples_per_frame + (2*frame_parms->ofdm_symbol_size);
// Determine search window
unsigned int start, length;
if (search_start >= 0 && search_length > 0) {
// Use provided search window for known neighboring cells
start = search_start;
length = search_length;
} else {
// For initial cell search
start = 0;
if (is == 0)
length = frame_parms->samples_per_frame + (2 * frame_parms->ofdm_symbol_size);
else
length = frame_parms->samples_per_frame;
}
AssertFatal(length>0,"illegal length %d\n",length);
peak_value = 0;
@@ -547,7 +557,7 @@ static int pss_search_time_nr(const c16_t **rxdata,
}
for (int pss_index = pss_index_start; pss_index < pss_index_end; pss_index++) {
for (n = 0; n < length; n += 4) { //
for (n = start; n < start + length; n += 4) { //
int64_t pss_corr_ue=0;
/* calculate dot product of primary_synchro_time_nr and rxdata[ar][n]
@@ -627,7 +637,7 @@ static int pss_search_time_nr(const c16_t **rxdata,
dB_fixed64(avg[pss_source]),
ffo_est);
if (peak_value < 5*avg[pss_source])
if ((search_start < 0 || search_length == 0) && peak_value < 5 * avg[pss_source])
return(-1);