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OpenXG
OpenXG UE
Commits
b751dc76
Commit
b751dc76
authored
Feb 01, 2019
by
Francesco Mani
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digital compensation of FFO on PBCH symbols (works only for FFO less than 0.5)
parent
179f9203
Changes
1
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1 changed file
with
26 additions
and
2 deletions
+26
-2
openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
+26
-2
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openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
View file @
b751dc76
...
...
@@ -39,6 +39,7 @@
//#include "SCHED/extern.h"
#include "common_lib.h"
#include <math.h>
#include "PHY/NR_REFSIG/pss_nr.h"
#include "PHY/NR_REFSIG/sss_nr.h"
...
...
@@ -55,6 +56,8 @@ int nr_pbch_detection(PHY_VARS_NR_UE *ue, runmode_t mode)
{
NR_DL_FRAME_PARMS
*
frame_parms
=&
ue
->
frame_parms
;
int
ret
=-
1
;
int
ar
,
n
;
double
im
,
re
;
#ifdef DEBUG_INITIAL_SYNCH
LOG_I
(
PHY
,
"[UE%d] Initial sync: starting PBCH detection (rx_offset %d)
\n
"
,
ue
->
Mod_id
,
...
...
@@ -65,6 +68,27 @@ int nr_pbch_detection(PHY_VARS_NR_UE *ue, runmode_t mode)
int
nb_prefix_samples0
=
frame_parms
->
nb_prefix_samples0
;
frame_parms
->
nb_prefix_samples0
=
frame_parms
->
nb_prefix_samples
;
// digital compensation of FFO for PBCH symbols
if
(
abs
(
2
*
ue
->
common_vars
.
freq_offset
)
<
frame_parms
->
subcarrier_spacing
){
// this FFO compensation seems to work only for FFO between -0.5 and 0.5
int
size_wp
=
(
frame_parms
->
ofdm_symbol_size
+
frame_parms
->
nb_prefix_samples0
);
// symbol size including prefix
double
s_time
=
1
/
(
1.0e3
*
frame_parms
->
samples_per_subframe
);
// sampling time
double
off_angle
=
-
2
*
M_PI
*
s_time
*
(
ue
->
common_vars
.
freq_offset
);
// offset rotation angle compensation per sample
int
start
=
ue
->
ssb_offset
+
size_wp
;
// start for offset correction is one symbol after ssb_offset (pss time position), including prefix
int
end
=
start
+
(
3
*
size_wp
);
// loop over samples in 3 symbols, including prefix
for
(
n
=
start
;
n
<
end
;
n
++
){
for
(
ar
=
0
;
ar
<
frame_parms
->
nb_antennas_rx
;
ar
++
)
{
re
=
((
double
)(((
short
*
)
ue
->
common_vars
.
rxdata
[
ar
]))[
2
*
n
]);
im
=
((
double
)(((
short
*
)
ue
->
common_vars
.
rxdata
[
ar
]))[
2
*
n
+
1
]);
((
short
*
)
ue
->
common_vars
.
rxdata
[
ar
])[
2
*
n
]
=
(
short
)(
round
(
re
*
cos
(
n
*
off_angle
)
-
im
*
sin
(
n
*
off_angle
)));
((
short
*
)
ue
->
common_vars
.
rxdata
[
ar
])[
2
*
n
+
1
]
=
(
short
)(
round
(
re
*
sin
(
n
*
off_angle
)
+
im
*
cos
(
n
*
off_angle
)));
}
}
}
//symbol 1
nr_slot_fep
(
ue
,
1
,
...
...
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