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Stefan Westerfeld
audiowmark
Commits
584d4a3f
Commit
584d4a3f
authored
Dec 19, 2018
by
Stefan Westerfeld
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Add randomized error test for convolution encode/decode.
Signed-off-by:
Stefan Westerfeld
<
stefan@space.twc.de
>
parent
4ece7494
Changes
1
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-21
convcode.cc
src/convcode.cc
+76
-21
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src/convcode.cc
View file @
584d4a3f
...
...
@@ -4,6 +4,7 @@
#include <assert.h>
using
std
::
vector
;
using
std
::
string
;
int
parity
(
unsigned
int
v
)
...
...
@@ -88,9 +89,27 @@ conv_decode (const vector<int>& coded_bits)
return
decoded_bits
;
}
vector
<
int
>
generate_error_vector
(
size_t
n
,
int
errors
)
{
vector
<
int
>
ev
(
n
);
while
(
errors
)
{
size_t
pos
=
rand
()
%
ev
.
size
();
if
(
ev
[
pos
]
!=
1
)
{
ev
[
pos
]
=
1
;
errors
--
;
}
}
return
ev
;
}
int
main
(
)
main
(
int
argc
,
char
**
argv
)
{
if
(
argc
==
1
)
{
vector
<
int
>
in_bits
=
bit_str_to_vec
(
"80f12381"
);
printf
(
"input vector (k=%zd): "
,
in_bits
.
size
());
...
...
@@ -111,4 +130,40 @@ main()
for
(
auto
b
:
decoded_bits
)
printf
(
"%d"
,
b
);
printf
(
"
\n
"
);
}
if
(
argc
==
2
&&
string
(
argv
[
1
])
==
"error"
)
{
for
(
size_t
bit_errors
=
0
;
bit_errors
<
100
;
bit_errors
++
)
{
size_t
coded_bit_count
=
0
;
int
bad_decode
=
0
;
constexpr
int
test_size
=
1000
;
for
(
int
i
=
0
;
i
<
test_size
;
i
++
)
{
vector
<
int
>
in_bits
;
while
(
in_bits
.
size
()
!=
128
)
in_bits
.
push_back
(
rand
()
&
1
);
vector
<
int
>
coded_bits
=
conv_encode
(
in_bits
);
coded_bit_count
=
coded_bits
.
size
();
vector
<
int
>
error_bits
=
generate_error_vector
(
coded_bits
.
size
(),
bit_errors
);
for
(
size_t
pos
=
0
;
pos
<
coded_bits
.
size
();
pos
++
)
coded_bits
[
pos
]
^=
error_bits
[
pos
];
vector
<
int
>
decoded_bits
=
conv_decode
(
coded_bits
);
assert
(
decoded_bits
.
size
()
==
128
);
int
errors
=
0
;
for
(
size_t
i
=
0
;
i
<
128
;
i
++
)
if
(
decoded_bits
[
i
]
!=
in_bits
[
i
])
errors
++
;
if
(
errors
>
0
)
bad_decode
++
;
}
printf
(
"%f %f
\n
"
,
(
100.0
*
bit_errors
)
/
coded_bit_count
,
(
100.0
*
bad_decode
)
/
test_size
);
}
}
}
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