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Filters improvement for linear interpolation as UL channel estimation technique

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This commit is contained in:
Roberto Louro Magueta
2022-11-30 14:22:53 +00:00
parent 8773e42363
commit eb41150d01
3 changed files with 28 additions and 25 deletions
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openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+10 -25
View File
@@ -108,7 +108,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
unsigned short bwp_start_subcarrier,
nfapi_nr_pusch_pdu_t *pusch_pdu) {
c16_t pilot[3280] __attribute__((aligned(16)));
int16_t *fl,*fm,*fr,*fml,*fmr,*fmm,*fdcl,*fdcr,*fdclh,*fdcrh;
int16_t *fdcl, *fdcr, *fdclh, *fdcrh;
const int chest_freq = gNB->chest_freq;
@@ -139,12 +139,6 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
switch (nushift) {
case 0:
fl = filt8_l0;
fm = filt8_m0;
fr = filt8_r0;
fmm = filt8_mm0;
fml = filt8_m0;
fmr = filt8_mr0;
fdcl = filt8_dcl0;
fdcr = filt8_dcr0;
fdclh = filt8_dcl0_h;
@@ -152,12 +146,6 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
break;
case 1:
fl = filt8_l1;
fm = filt8_m1;
fr = filt8_r1;
fmm = filt8_mm1;
fml = filt8_ml1;
fmr = filt8_mm1;
fdcl = filt8_dcl1;
fdcr = filt8_dcr1;
fdclh = filt8_dcl1_h;
@@ -256,19 +244,16 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
#endif
if (pilot_cnt == 0) {
c16multaddVectRealComplex(fl, &ch16, ul_ch, 8);
} else if (pilot_cnt == 1) {
c16multaddVectRealComplex(fml, &ch16, ul_ch, 8);
} else if (pilot_cnt == (6*nb_rb_pusch-2)) {
c16multaddVectRealComplex(fmr, &ch16, ul_ch, 8);
ul_ch+=4;
} else if (pilot_cnt == (6*nb_rb_pusch-1)) {
c16multaddVectRealComplex(fr, &ch16, ul_ch, 8);
} else if (pilot_cnt%2 == 0) {
c16multaddVectRealComplex(fmm, &ch16, ul_ch, 8);
ul_ch+=4;
c16multaddVectRealComplex(filt16_ul_p0, &ch16, ul_ch, 16);
} else if (pilot_cnt == 1 || pilot_cnt == 2) {
c16multaddVectRealComplex(filt16_ul_p1p2, &ch16, ul_ch, 16);
} else if (pilot_cnt == (6 * nb_rb_pusch - 1)) {
c16multaddVectRealComplex(filt16_ul_last, &ch16, ul_ch, 16);
} else {
c16multaddVectRealComplex(fm, &ch16, ul_ch, 8);
c16multaddVectRealComplex(filt16_ul_middle, &ch16, ul_ch, 16);
if (pilot_cnt % 2 == 0) {
ul_ch += 4;
}
}
pilot_cnt++;
openair1/PHY/NR_UE_ESTIMATION/filt16a_32.c
+13
View File
@@ -329,3 +329,16 @@ short filt24_end[24] = {
short filt24_middle[24] = {
4096,4779,5461,6144,6827,7509,8192,8875,9557,10240,10923,11605,
12288,11605,10923,10240,9557,8875,8192,7509,6827,6144,5461,4779};
// UL
short filt16_ul_p0[16] = {4096, 4096, 4096, 4096, 4096, 4096, 4096, 4096,
0, 0, 0, 0, 0, 0, 0, 0};
short filt16_ul_p1p2[16] = {4096, 4096, 4096, 4096, 2048, 2048, 2048, 2048,
2048, 2048, 2048, 2048, 0, 0, 0, 0};
short filt16_ul_middle[16] = {2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048,
2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048};
short filt16_ul_last[16] = {4096, 4096, 4096, 4096, 8192, 8192, 8192, 8192,
0, 0, 0, 0, 0, 0, 0, 0};
openair1/PHY/NR_UE_ESTIMATION/filt16a_32.h
+5
View File
@@ -219,4 +219,9 @@ extern short filt24_start[24];
extern short filt24_end[24];
extern short filt24_middle[24];
/*UL*/
extern short filt16_ul_p0[16];
extern short filt16_ul_p1p2[16];
extern short filt16_ul_middle[16];
extern short filt16_ul_last[16];
#endif