<s>
In	O
information	O
theory	O
,	O
a	O
polar	B-Error_Name
code	I-Error_Name
is	O
a	O
linear	O
block	O
error-correcting	B-Error_Name
code	I-Error_Name
.	O
</s>
<s>
Notably	O
,	O
polar	B-Error_Name
codes	I-Error_Name
have	O
modest	O
encoding	O
and	O
decoding	O
complexity	O
,	O
which	O
renders	O
them	O
attractive	O
for	O
many	O
applications	O
.	O
</s>
<s>
Moreover	O
,	O
the	O
encoding	O
and	O
decoding	O
energy	O
complexity	O
of	O
generalized	O
polar	B-Error_Name
codes	I-Error_Name
can	O
reach	O
the	O
fundamental	O
lower	O
bounds	O
for	O
energy	O
consumption	O
of	O
two	O
dimensional	O
circuitry	O
to	O
within	O
an	O
factor	O
for	O
any	O
.	O
</s>
<s>
Polar	B-Error_Name
codes	I-Error_Name
have	O
some	O
limitations	O
when	O
used	O
in	O
industrial	O
applications	O
.	O
</s>
<s>
Primarily	O
,	O
the	O
original	O
design	O
of	O
the	O
polar	B-Error_Name
codes	I-Error_Name
achieves	O
capacity	O
when	O
block	O
sizes	O
are	O
asymptotically	O
large	O
with	O
a	O
successive	O
cancellation	O
decoder	O
.	O
</s>
<s>
However	O
,	O
with	O
the	O
block	O
sizes	O
used	O
in	O
industry	O
,	O
the	O
performance	O
of	O
the	O
successive	O
cancellation	O
is	O
poor	O
compared	O
to	O
well-defined	O
and	O
implemented	O
coding	O
schemes	O
such	O
as	O
low-density	B-Error_Name
parity-check	I-Error_Name
code	I-Error_Name
(	O
LDPC	B-Error_Name
)	O
and	O
turbo	B-Error_Name
code	I-Error_Name
.	O
</s>
<s>
In	O
October	O
2016	O
,	O
Huawei	O
announced	O
that	O
it	O
had	O
achieved	O
27	O
Gbit/s	O
in	O
5G	O
field	O
trial	O
tests	O
using	O
polar	B-Error_Name
codes	I-Error_Name
for	O
channel	O
coding	O
.	O
</s>
<s>
In	O
November	O
2016	O
,	O
3GPP	O
agreed	O
to	O
adopt	O
polar	B-Error_Name
codes	I-Error_Name
for	O
the	O
eMBB	O
(	O
Enhanced	O
Mobile	O
Broadband	O
)	O
control	O
channels	O
for	O
the	O
5G	O
NR	O
(	O
New	O
Radio	O
)	O
interface	O
.	O
</s>
<s>
At	O
the	O
same	O
meeting	O
,	O
3GPP	O
agreed	O
to	O
use	O
LDPC	B-Error_Name
for	O
the	O
corresponding	O
data	O
channel	O
.	O
</s>
<s>
At	O
short	O
blocklengths	O
,	O
such	O
codes	O
outperform	O
both	O
convolutional	O
codes	O
and	O
CRC-aided	O
list	O
decoding	O
of	O
conventional	O
polar	B-Error_Name
codes	I-Error_Name
.	O
</s>
