<s>
An	O
extrinsic	O
information	O
transfer	O
chart	O
,	O
commonly	O
called	O
an	O
EXIT	B-Error_Name
chart	I-Error_Name
,	O
is	O
a	O
technique	O
to	O
aid	O
the	O
construction	O
of	O
good	O
iteratively-decoded	O
error-correcting	B-Error_Name
codes	I-Error_Name
(	O
in	O
particular	O
low-density	O
parity-check	O
(	O
LDPC	B-Error_Name
)	O
codes	O
and	O
Turbo	B-Error_Name
codes	I-Error_Name
)	O
.	O
</s>
<s>
EXIT	B-Error_Name
charts	I-Error_Name
were	O
developed	O
by	O
Stephan	O
ten	O
Brink	O
,	O
building	O
on	O
the	O
concept	O
of	O
extrinsic	O
information	O
developed	O
in	O
the	O
Turbo	B-Error_Name
coding	I-Error_Name
community	O
.	O
</s>
<s>
An	O
EXIT	B-Error_Name
chart	I-Error_Name
includes	O
the	O
response	O
of	O
elements	O
of	O
decoder	O
(	O
for	O
example	O
a	O
convolutional	O
decoder	O
of	O
a	O
Turbo	B-Error_Name
code	I-Error_Name
,	O
the	O
LDPC	B-Error_Name
parity-check	O
nodes	O
or	O
the	O
LDPC	B-Error_Name
variable	O
nodes	O
)	O
.	O
</s>
