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zzha zzha
OpenXG-RAN
Commits
3a983dbf
Commit
3a983dbf
authored
Nov 30, 2021
by
rmagueta
Browse files
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Plain Diff
LS channel estimation based on SRS at gNB
parent
0ae0c9ac
Changes
7
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7 changed files
with
93 additions
and
0 deletions
+93
-0
openair1/PHY/INIT/nr_init.c
openair1/PHY/INIT/nr_init.c
+5
-0
openair1/PHY/INIT/nr_init_ue.c
openair1/PHY/INIT/nr_init_ue.c
+5
-0
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+60
-0
openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h
openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h
+10
-0
openair1/PHY/NR_UE_TRANSPORT/srs_modulation_nr.c
openair1/PHY/NR_UE_TRANSPORT/srs_modulation_nr.c
+1
-0
openair1/PHY/defs_nr_common.h
openair1/PHY/defs_nr_common.h
+4
-0
openair1/SCHED_NR/phy_procedures_nr_gNB.c
openair1/SCHED_NR/phy_procedures_nr_gNB.c
+8
-0
No files found.
openair1/PHY/INIT/nr_init.c
View file @
3a983dbf
...
...
@@ -198,9 +198,14 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
for
(
int
id
=
0
;
id
<
NUMBER_OF_NR_SRS_MAX
;
id
++
)
{
gNB
->
nr_srs_info
[
id
]
=
(
nr_srs_info_t
*
)
malloc16_clear
(
sizeof
(
nr_srs_info_t
));
gNB
->
nr_srs_info
[
id
]
->
srs_generated_signal
=
(
int32_t
*
)
malloc16_clear
(
fp
->
samples_per_frame
*
sizeof
(
int32_t
));
gNB
->
nr_srs_info
[
id
]
->
noise_power
=
(
double
*
)
malloc16_clear
(
sizeof
(
double
));
gNB
->
nr_srs_info
[
id
]
->
srs_received_signal
=
(
int32_t
**
)
malloc16
(
Prx
*
sizeof
(
int32_t
*
));
gNB
->
nr_srs_info
[
id
]
->
srs_ls_estimated_channel
=
(
int32_t
**
)
malloc16
(
Prx
*
sizeof
(
int32_t
*
));
gNB
->
nr_srs_info
[
id
]
->
srs_estimated_channel
=
(
int32_t
**
)
malloc16
(
Prx
*
sizeof
(
int32_t
*
));
for
(
i
=
0
;
i
<
Prx
;
i
++
){
gNB
->
nr_srs_info
[
id
]
->
srs_received_signal
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
fp
->
samples_per_frame
*
sizeof
(
int32_t
));
gNB
->
nr_srs_info
[
id
]
->
srs_ls_estimated_channel
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
fp
->
samples_per_frame
*
sizeof
(
int32_t
));
gNB
->
nr_srs_info
[
id
]
->
srs_estimated_channel
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
fp
->
samples_per_frame
*
sizeof
(
int32_t
));
}
}
...
...
openair1/PHY/INIT/nr_init_ue.c
View file @
3a983dbf
...
...
@@ -325,9 +325,14 @@ int init_nr_ue_signal(PHY_VARS_NR_UE *ue,
srs_vars
[
gNB_id
]
->
active
=
false
;
ue
->
nr_srs_info
=
(
nr_srs_info_t
*
)
malloc16_clear
(
sizeof
(
nr_srs_info_t
));
ue
->
nr_srs_info
->
srs_generated_signal
=
(
int32_t
*
)
malloc16_clear
(
(
2
*
(
fp
->
samples_per_frame
)
+
2048
)
*
sizeof
(
int32_t
)
);
ue
->
nr_srs_info
->
noise_power
=
(
double
*
)
malloc16_clear
(
sizeof
(
double
));
ue
->
nr_srs_info
->
srs_received_signal
=
(
int32_t
**
)
malloc16
(
fp
->
nb_antennas_rx
*
sizeof
(
int32_t
*
)
);
ue
->
nr_srs_info
->
srs_ls_estimated_channel
=
(
int32_t
**
)
malloc16
(
fp
->
nb_antennas_rx
*
sizeof
(
int32_t
*
)
);
ue
->
nr_srs_info
->
srs_estimated_channel
=
(
int32_t
**
)
malloc16
(
fp
->
nb_antennas_rx
*
sizeof
(
int32_t
*
)
);
for
(
i
=
0
;
i
<
fp
->
nb_antennas_rx
;
i
++
)
{
ue
->
nr_srs_info
->
srs_received_signal
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
(
2
*
(
fp
->
samples_per_frame
)
+
2048
)
*
sizeof
(
int32_t
)
);
ue
->
nr_srs_info
->
srs_ls_estimated_channel
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
(
2
*
(
fp
->
samples_per_frame
)
+
2048
)
*
sizeof
(
int32_t
)
);
ue
->
nr_srs_info
->
srs_estimated_channel
[
i
]
=
(
int32_t
*
)
malloc16_clear
(
(
2
*
(
fp
->
samples_per_frame
)
+
2048
)
*
sizeof
(
int32_t
)
);
}
if
(
abstraction_flag
==
0
)
{
...
...
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
View file @
3a983dbf
...
...
@@ -36,6 +36,7 @@
//#define DEBUG_CH
//#define DEBUG_PUSCH
//#define SRS_DEBUG
#define NO_INTERP 1
#define dBc(x,y) (dB_fixed(((int32_t)(x))*(x) + ((int32_t)(y))*(y)))
...
...
@@ -1091,3 +1092,62 @@ void nr_pusch_ptrs_processing(PHY_VARS_gNB *gNB,
}
// last symbol check
}
//Antenna loop
}
int
nr_srs_channel_estimation
(
PHY_VARS_gNB
*
gNB
,
int
frame
,
int
slot
,
nfapi_nr_srs_pdu_t
*
srs_pdu
,
nr_srs_info_t
*
nr_srs_info
,
int32_t
*
srs_generated_signal
,
int32_t
**
srs_received_signal
,
int32_t
**
srs_estimated_channel
,
double
*
noise_power
)
{
if
(
nr_srs_info
->
n_symbs
==
0
)
{
LOG_E
(
NR_PHY
,
"(%d.%d) nr_srs_info was not generated yet!
\n
"
,
frame
,
slot
);
return
-
1
;
}
NR_DL_FRAME_PARMS
*
frame_parms
=
&
gNB
->
frame_parms
;
int32_t
**
srs_ls_estimated_channel
=
nr_srs_info
->
srs_ls_estimated_channel
;
uint64_t
subcarrier_offset
=
frame_parms
->
first_carrier_offset
+
srs_pdu
->
bwp_start
*
12
;
for
(
int
ant
=
0
;
ant
<
frame_parms
->
nb_antennas_rx
;
ant
++
)
{
memset
(
srs_ls_estimated_channel
[
ant
],
0
,
frame_parms
->
samples_per_frame
*
sizeof
(
int32_t
));
memset
(
srs_estimated_channel
[
ant
],
0
,
frame_parms
->
samples_per_frame
*
sizeof
(
int32_t
));
for
(
int
sc_idx
=
0
;
sc_idx
<
nr_srs_info
->
n_symbs
;
sc_idx
++
)
{
int16_t
generated_real
=
srs_generated_signal
[
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
+
subcarrier_offset
]
&
0xFFFF
;
int16_t
generated_imag
=
(
srs_generated_signal
[
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
+
subcarrier_offset
]
>>
16
)
&
0xFFFF
;
int16_t
received_real
=
srs_received_signal
[
ant
][
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
+
subcarrier_offset
]
&
0xFFFF
;
int16_t
received_imag
=
(
srs_received_signal
[
ant
][
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
+
subcarrier_offset
]
>>
16
)
&
0xFFFF
;
// We know that nr_srs_info->srs_generated_signal_bits bits are enough to represent the generated_real and generated_imag.
// So we only need a nr_srs_info->srs_generated_signal_bits shift to ensure that the result fits into 16 bits.
int16_t
ls_estimated_real
=
(
int16_t
)(((
int32_t
)
generated_real
*
received_real
+
(
int32_t
)
generated_imag
*
received_imag
)
>>
nr_srs_info
->
srs_generated_signal_bits
);
int16_t
ls_estimated_imag
=
(
int16_t
)(((
int32_t
)
generated_real
*
received_imag
-
(
int32_t
)
generated_imag
*
received_real
)
>>
nr_srs_info
->
srs_generated_signal_bits
);
srs_ls_estimated_channel
[
ant
][
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
+
subcarrier_offset
]
=
ls_estimated_real
+
(((
int32_t
)
ls_estimated_imag
<<
16
)
&
0xFFFF0000
);
#ifdef SRS_DEBUG
if
(
sc_idx
==
0
)
{
LOG_I
(
NR_PHY
,
"______________________________ Rx antenna %i _______________________________
\n
"
,
ant
);
}
if
(
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
%
12
==
0
)
{
LOG_I
(
NR_PHY
,
":::::::::::::::::::::::::::::::::::: %i ::::::::::::::::::::::::::::::::::::
\n
"
,
nr_srs_info
->
subcarrier_idx
[
sc_idx
]
/
12
);
LOG_I
(
NR_PHY
,
"
\t
__genRe________genIm__|____rxRe_________rxIm__|____lsRe________lsIm_
\n
"
);
}
LOG_I
(
NR_PHY
,
"(%4i) %6i
\t
%6i | %6i
\t
%6i | %6i
\t
%6i
\n
"
,
nr_srs_info
->
subcarrier_idx
[
sc_idx
],
generated_real
,
generated_imag
,
received_real
,
received_imag
,
ls_estimated_real
,
ls_estimated_imag
);
#endif
}
}
return
0
;
}
\ No newline at end of file
openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h
View file @
3a983dbf
...
...
@@ -62,4 +62,14 @@ void nr_pusch_ptrs_processing(PHY_VARS_gNB *gNB,
uint8_t
nr_tti_rx
,
unsigned
char
symbol
,
uint32_t
nb_re_pusch
);
int
nr_srs_channel_estimation
(
PHY_VARS_gNB
*
gNB
,
int
frame
,
int
slot
,
nfapi_nr_srs_pdu_t
*
srs_pdu
,
nr_srs_info_t
*
nr_srs_info
,
int32_t
*
srs_generated_signal
,
int32_t
**
srs_received_signal
,
int32_t
**
srs_estimated_channel
,
double
*
noise_power
);
#endif
openair1/PHY/NR_UE_TRANSPORT/srs_modulation_nr.c
View file @
3a983dbf
...
...
@@ -120,6 +120,7 @@ int generate_srs_nr(nfapi_nr_srs_pdu_t *srs_config_pdu,
if
(
nr_srs_info
)
{
nr_srs_info
->
n_symbs
=
0
;
nr_srs_info
->
srs_generated_signal_bits
=
log2_approx
(
amp
);
}
#ifdef SRS_DEBUG
...
...
openair1/PHY/defs_nr_common.h
View file @
3a983dbf
...
...
@@ -243,8 +243,12 @@ typedef struct {
typedef
struct
{
uint16_t
n_symbs
;
uint16_t
subcarrier_idx
[
6
*
NR_MAX_NB_RB
];
uint8_t
srs_generated_signal_bits
;
int32_t
*
srs_generated_signal
;
int32_t
**
srs_received_signal
;
int32_t
**
srs_ls_estimated_channel
;
int32_t
**
srs_estimated_channel
;
double
*
noise_power
;
}
nr_srs_info_t
;
typedef
struct
NR_DL_FRAME_PARMS
NR_DL_FRAME_PARMS
;
...
...
openair1/SCHED_NR/phy_procedures_nr_gNB.c
View file @
3a983dbf
...
...
@@ -804,6 +804,14 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx) {
}
nr_get_srs_signal
(
gNB
,
frame_rx
,
slot_rx
,
srs_pdu
,
gNB
->
nr_srs_info
[
i
],
gNB
->
nr_srs_info
[
i
]
->
srs_received_signal
);
nr_srs_channel_estimation
(
gNB
,
frame_rx
,
slot_rx
,
srs_pdu
,
gNB
->
nr_srs_info
[
i
],
gNB
->
nr_srs_info
[
i
]
->
srs_generated_signal
,
gNB
->
nr_srs_info
[
i
]
->
srs_received_signal
,
gNB
->
nr_srs_info
[
i
]
->
srs_estimated_channel
,
gNB
->
nr_srs_info
[
i
]
->
noise_power
);
srs
->
active
=
0
;
}
}
...
...
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