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Michael Black
OpenXG UE
Commits
460c2e7a
Commit
460c2e7a
authored
Jun 08, 2017
by
Florian Kaltenberger
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alternative version of dlsch_channel_level not needing floating point
parent
9b0cbb30
Changes
3
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3 changed files
with
27 additions
and
7 deletions
+27
-7
openair1/PHY/LTE_TRANSPORT/dlsch_demodulation.c
openair1/PHY/LTE_TRANSPORT/dlsch_demodulation.c
+4
-7
openair1/PHY/TOOLS/defs.h
openair1/PHY/TOOLS/defs.h
+3
-0
openair1/PHY/TOOLS/log2_approx.c
openair1/PHY/TOOLS/log2_approx.c
+20
-0
No files found.
openair1/PHY/LTE_TRANSPORT/dlsch_demodulation.c
View file @
460c2e7a
...
...
@@ -3389,11 +3389,9 @@ void dlsch_channel_level(int **dl_ch_estimates_ext,
nre
=
12
;
//nb_rb*nre = y * 2^x
int16_t
x
=
log2_approx
(
nb_rb
*
nre
)
-
1
;
//int16_t one_over_y_q15 = (int16_t)((1<<((int32_t)x+15))/((int32_t)nb_rb*(int32_t)nre));
float
y
=
(
float
)(
nb_rb
*
nre
)
/
(
float
)(
1
<<
x
);
//printf("1/(nb_rb*nre) = 1/%d = %d*2^(-15) * 2^(-%d)\n",nb_rb*nre,one_over_y_q15,x);
printf
(
"nb_rb*nre = %d = %f * 2^(%d)
\n
"
,
nb_rb
*
nre
,
y
,
x
);
int16_t
x
=
factor2
(
nb_rb
*
nre
);
int16_t
y
=
(
nb_rb
*
nre
)
/
(
1
<<
x
);
printf
(
"nb_rb*nre = %d = %d * 2^(%d)
\n
"
,
nb_rb
*
nre
,
y
,
x
);
for
(
aatx
=
0
;
aatx
<
frame_parms
->
nb_antenna_ports_eNB
;
aatx
++
)
for
(
aarx
=
0
;
aarx
<
frame_parms
->
nb_antennas_rx
;
aarx
++
)
{
...
...
@@ -3432,8 +3430,7 @@ void dlsch_channel_level(int **dl_ch_estimates_ext,
avg
[(
aatx
<<
1
)
+
aarx
]
=
(((
int32_t
*
)
&
avg128D
)[
0
]
+
((
int32_t
*
)
&
avg128D
)[
1
]
+
((
int32_t
*
)
&
avg128D
)[
2
]
+
((
int32_t
*
)
&
avg128D
)[
3
]);
avg
[(
aatx
<<
1
)
+
aarx
]
=
(
int32_t
)
((
float
)
avg
[(
aatx
<<
1
)
+
aarx
]
/
y
);
((
int32_t
*
)
&
avg128D
)[
3
])
/
y
;
printf
(
"Channel level : %d
\n
"
,
avg
[(
aatx
<<
1
)
+
aarx
]);
}
...
...
openair1/PHY/TOOLS/defs.h
View file @
460c2e7a
...
...
@@ -338,6 +338,9 @@ uint8_t log2_approx64(unsigned long long int x);
int16_t
invSqrt
(
int16_t
x
);
uint32_t
angle
(
struct
complex16
perrror
);
/// computes the number of factors 2 in x
unsigned
char
factor2
(
unsigned
int
x
);
/*!\fn int32_t phy_phase_compensation_top (uint32_t pilot_type, uint32_t initial_pilot,
uint32_t last_pilot, int32_t ignore_prefix);
Compensate the phase rotation of the RF. WARNING: This function is currently unused. It has not been tested!
...
...
openair1/PHY/TOOLS/log2_approx.c
View file @
460c2e7a
...
...
@@ -37,6 +37,26 @@ unsigned char log2_approx(unsigned int x)
return
(
l2
);
}
unsigned
char
factor2
(
unsigned
int
x
)
{
int
i
;
unsigned
char
l2
;
l2
=
0
;
for
(
i
=
0
;
i
<
31
;
i
++
)
if
((
x
&
(
1
<<
i
))
!=
0
)
break
;
l2
=
i
;
//printf("factor2(%d) = %d\n",x,l2);
return
(
l2
);
}
unsigned
char
log2_approx64
(
unsigned
long
long
int
x
)
{
...
...
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