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zzha zzha
OpenXG-RAN
Commits
087f9a0b
Commit
087f9a0b
authored
Jun 19, 2023
by
rmagueta
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Implementation of delay estimation in NFAPI_NR_DMRS_TYPE2_linear_interp() at UE
parent
e0ab96ee
Changes
1
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1 changed file
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29 additions
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17 deletions
+29
-17
openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
+29
-17
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openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
View file @
087f9a0b
...
...
@@ -1536,35 +1536,46 @@ void NFAPI_NR_DMRS_TYPE2_linear_interp(NR_DL_FRAME_PARMS *frame_parms,
{
int
re_offset
=
bwp_start_subcarrier
%
frame_parms
->
ofdm_symbol_size
;
c16_t
*
dl_ch0
=
dl_ch
;
c16_t
ch
=
{
0
};
c16_t
ch_l
=
{
0
}
;
c16_t
ch_r
=
{
0
}
;
c16_t
dl_ls_est
[
frame_parms
->
ofdm_symbol_size
]
__attribute__
((
aligned
(
32
)))
;
memset
(
dl_ls_est
,
0
,
sizeof
(
dl_ls_est
))
;
for
(
int
pilot_cnt
=
0
;
pilot_cnt
<
4
*
nb_rb_pdsch
;
pilot_cnt
+=
2
)
{
ch_l
=
c16mulShift
(
*
pil
,
rxF
[
re_offset
],
15
);
c
16_t
c
h_l
=
c16mulShift
(
*
pil
,
rxF
[
re_offset
],
15
);
#ifdef DEBUG_PDSCH
printf
(
"pilot %3d: pil -> (%6d,%6d), rxF -> (%4d,%4d), ch -> (%4d,%4d)
\n
"
,
pilot_cnt
,
pil
->
r
,
pil
->
i
,
rxF
[
re_offset
].
r
,
rxF
[
re_offset
].
i
,
ch_l
.
r
,
ch_l
.
i
);
#endif
pil
++
;
re_offset
=
(
re_offset
+
1
)
%
frame_parms
->
ofdm_symbol_size
;
ch_r
=
c16mulShift
(
*
pil
,
rxF
[
re_offset
],
15
);
c
16_t
c
h_r
=
c16mulShift
(
*
pil
,
rxF
[
re_offset
],
15
);
#ifdef DEBUG_PDSCH
printf
(
"pilot %3d: pil -> (%6d,%6d), rxF -> (%4d,%4d), ch -> (%4d,%4d)
\n
"
,
pilot_cnt
,
pil
->
r
,
pil
->
i
,
rxF
[
re_offset
].
r
,
rxF
[
re_offset
].
i
,
ch_r
.
r
,
ch_r
.
i
);
#endif
ch
=
c16addShift
(
ch_l
,
ch_r
,
1
);
if
(
pilot_cnt
==
1
)
{
multadd_real_vector_complex_scalar
(
filt16_dl_first_type2
,
(
int16_t
*
)
&
ch
,
(
int16_t
*
)
dl_ch
,
16
);
dl_ch
+=
3
;
}
else
if
(
pilot_cnt
==
(
4
*
nb_rb_pdsch
-
1
))
{
multadd_real_vector_complex_scalar
(
filt16_dl_last_type2
,
(
int16_t
*
)
&
ch
,
(
int16_t
*
)
dl_ch
,
16
);
}
else
{
multadd_real_vector_complex_scalar
(
filt16_dl_middle_type2
,
(
int16_t
*
)
&
ch
,
(
int16_t
*
)
dl_ch
,
16
);
dl_ch
+=
6
;
c16_t
ch
=
c16addShift
(
ch_l
,
ch_r
,
1
);
for
(
int
k
=
3
*
pilot_cnt
;
k
<
(
3
*
pilot_cnt
)
+
6
;
k
++
)
{
dl_ls_est
[
k
]
=
ch
;
}
pil
++
;
re_offset
=
(
re_offset
+
5
)
%
frame_parms
->
ofdm_symbol_size
;
}
nr_est_delay_pdsch
(
frame_parms
,
dl_ls_est
,
delay
);
int
delay_idx
=
get_delay_idx
(
delay
->
est_delay
,
MAX_DELAY_COMP
);
c16_t
*
dl_delay_table
=
frame_parms
->
delay_table
[
delay_idx
];
for
(
int
pilot_cnt
=
0
;
pilot_cnt
<
6
*
nb_rb_pdsch
;
pilot_cnt
++
)
{
if
(
pilot_cnt
==
0
)
{
// Treat first pilot
c16multaddVectRealComplex
(
filt16_dl_first
,
&
dl_ls_est
[
pilot_cnt
<<
1
],
dl_ch
,
16
);
}
else
if
(
pilot_cnt
==
6
*
nb_rb_pdsch
-
1
)
{
// Treat last pilot
c16multaddVectRealComplex
(
filt16_dl_last
,
&
dl_ls_est
[
pilot_cnt
<<
1
],
dl_ch
,
16
);
}
else
{
// Treat middle pilots
c16multaddVectRealComplex
(
filt16_dl_middle
,
&
dl_ls_est
[
pilot_cnt
<<
1
],
dl_ch
,
16
);
if
(
pilot_cnt
%
2
==
0
)
{
dl_ch
+=
4
;
}
}
}
// check if PRB crosses DC and improve estimates around DC
if
((
bwp_start_subcarrier
<
frame_parms
->
ofdm_symbol_size
)
&&
(
bwp_start_subcarrier
+
nb_rb_pdsch
*
12
>=
frame_parms
->
ofdm_symbol_size
)
&&
(
p
<
2
))
{
dl_ch
=
dl_ch0
;
...
...
@@ -1573,9 +1584,9 @@ void NFAPI_NR_DMRS_TYPE2_linear_interp(NR_DL_FRAME_PARMS *frame_parms,
dl_ch
=
memset
(
dl_ch
,
0
,
sizeof
(
c16_t
)
*
10
);
dl_ch
--
;
ch_r
=
*
dl_ch
;
c
16_t
c
h_r
=
*
dl_ch
;
dl_ch
+=
11
;
ch_l
=
*
dl_ch
;
c
16_t
c
h_l
=
*
dl_ch
;
// for proper allignment of SIMD vectors
if
((
frame_parms
->
N_RB_DL
&
1
)
==
0
)
{
...
...
@@ -1776,7 +1787,8 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
bwp_start_subcarrier
,
nb_rb_pdsch
,
delta
,
p
);
p
,
&
delay
);
}
else
if
(
config_type
==
NFAPI_NR_DMRS_TYPE1
)
{
NFAPI_NR_DMRS_TYPE1_average_prb
(
&
ue
->
frame_parms
,
...
...
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