maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Revert "adding detection of multiple PSS."

Browse Source 
This partially reverts commit 449da9ac17.
This commit is contained in:
Florian Kaltenberger
2019-02-20 10:08:14 +01:00
parent 1a27089fc9
commit a0473b4dd1
1 changed files with 27 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/PHY/NR_UE_TRANSPORT/pss_nr.c
+27 -62
View File
@@ -803,47 +803,25 @@ static inline int64_t abs64(int64_t x)
#define DOT_PRODUCT_SCALING_SHIFT (17)
int max3(int64_t a, int64_t b, int64_t c) {
if (a>b) {
if (a>c) {
return(0);
}
else {
return(2);
}
}
else {
if (b>c) {
return(1);
}
else {
return(2);
}
}
}
int pss_search_time_nr(int **rxdata, ///rx data in time domain
NR_DL_FRAME_PARMS *frame_parms,
int *eNB_id)
{
uint8_t L_max = 4;
unsigned int m, n, ar, n_peaks=0;
unsigned int peak_position[3*L_max], pss_source[3*L_max];
int64_t peak_value, threshold;
unsigned int n, ar, peak_position, pss_source;
int64_t peak_value;
int64_t result;
int64_t avg[NUMBER_PSS_SEQUENCE];
uint8_t found_peak=0;
unsigned int length = (NR_NUMBER_OF_SUBFRAMES_PER_FRAME*frame_parms->samples_per_subframe); /* 1 frame for now, it should be 2 TODO_NR */
AssertFatal(length>0,"illegal length %d\n",length);
for (int i = 0; i < NUMBER_PSS_SEQUENCE; i++) AssertFatal(pss_corr_ue[i] != NULL,"pss_corr_ue[%d] not yet allocated! Exiting.\n", i);
for (int i=0;i<4;i++) {
peak_position[i] = length; //max possible value
pss_source[i] = 0;
}
peak_value = 0;
peak_position = 0;
pss_source = 0;
int maxval=0;
for (int i=0;i<2*(frame_parms->ofdm_symbol_size);i++) {
@@ -866,9 +844,9 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
memset(pss_corr_ue[pss_index],0,length*sizeof(int64_t));
}
for (int pss_index = 0; pss_index < NUMBER_PSS_SEQUENCE; pss_index++) {
for (n=0; n < length; n+=4) { //
for (n=0; n < length; n+=4) { //
for (int pss_index = 0; pss_index < NUMBER_PSS_SEQUENCE; pss_index++) {
if ( n < (length - frame_parms->ofdm_symbol_size)) {
@@ -892,40 +870,27 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
/* calculate the absolute value of sync_corr[n] */
avg[pss_index]+=pss_corr_ue[pss_index][n];
}
avg[pss_index]/=(length/4);
}
threshold = 10*avg[max3(avg[0],avg[1],avg[2])];
peak_value = threshold;
for (n=0; n < length; n+=4) {
m = max3(pss_corr_ue[0][n],pss_corr_ue[1][n],pss_corr_ue[2][n]);
if (pss_corr_ue[m][n] > peak_value) {
peak_value = pss_corr_ue[m][n];
peak_position[n_peaks] = n;
pss_source[n_peaks] = m;
found_peak = 1;
}
if ((peak_position[n_peaks]+4*(frame_parms->ofdm_symbol_size+frame_parms->nb_prefix_samples)<n) &&
(found_peak==1)) {
//#ifdef DEBUG_PSS_NR
printf("peak %d found at pss_index %d, n %6d, peak_value %15llu\n", n_peaks, pss_source[n_peaks], peak_position[n_peaks], (unsigned long long)pss_corr_ue[ pss_source[n_peaks]][peak_position[n_peaks]]);
//#endif
peak_value = threshold;
found_peak = 0;
n_peaks++;
//if (n_peaks==L_max) break;
if (pss_corr_ue[pss_index][n] > peak_value) {
peak_value = pss_corr_ue[pss_index][n];
peak_position = n;
pss_source = pss_index;
#ifdef DEBUG_PSS_NR
printf("pss_index %d: n %6d peak_value %15llu\n", pss_index, n, (unsigned long long)pss_corr_ue[pss_index][n]);
#endif
}
}
}
*eNB_id = pss_source[0];
for (int pss_index = 0; pss_index < NUMBER_PSS_SEQUENCE; pss_index++) avg[pss_index]/=(length/4);
*eNB_id = pss_source;
LOG_I(PHY,"[UE] nr_synchro_time: Sync source = %d, Peak found at pos %d, val = %llu (%d dB) avg %d dB\n", pss_source, peak_position, (unsigned long long)peak_value, dB_fixed64(peak_value),dB_fixed64(avg[pss_source]));
if (peak_value < 5*avg[pss_source])
return(-1);
//LOG_I(PHY,"[UE] nr_synchro_time: Sync source = %d, Peak found at pos %d, val = %llu (%d dB) avg %d dB\n", pss_source, peak_position, (unsigned long long)peak_value, dB_fixed64(peak_value),dB_fixed64(avg[pss_source]));
#ifdef DBG_PSS_NR
@@ -942,6 +907,6 @@ int pss_search_time_nr(int **rxdata, ///rx data in time domain
#endif
return(peak_position[0]);
return(peak_position);
}