<s>
Self-interference	B-Protocol
cancellation	I-Protocol
(	O
SIC	O
)	O
is	O
a	O
signal	O
processing	O
technique	O
that	O
enables	O
a	O
radio	O
transceiver	O
to	O
simultaneously	O
transmit	O
and	O
receive	O
on	O
a	O
single	O
channel	O
,	O
a	O
pair	O
of	O
partially-overlapping	O
channels	O
,	O
or	O
any	O
pair	O
of	O
channels	O
in	O
the	O
same	O
frequency	O
band	O
.	O
</s>
<s>
When	O
used	O
to	O
allow	O
simultaneous	O
transmission	O
and	O
reception	O
on	O
the	O
same	O
frequency	O
,	O
sometimes	O
referred	O
to	O
as	O
“	O
in-band	O
full-duplex	O
”	O
or	O
“	O
simultaneous	O
transmit	O
and	O
receive	O
,	O
”	O
SIC	O
effectively	O
doubles	O
spectral	B-Protocol
efficiency	I-Protocol
.	O
</s>
<s>
Self-interference	B-Protocol
cancellation	I-Protocol
has	O
applications	O
in	O
mobile	O
networks	O
,	O
the	O
unlicensed	O
bands	O
,	O
cable	O
TV	O
,	O
mesh	B-Architecture
networks	I-Architecture
,	O
the	O
military	O
,	O
and	O
public	O
safety	O
.	O
</s>
<s>
Finally	O
,	O
the	O
self-interference	B-Protocol
cancellation	I-Protocol
solution	O
must	O
detect	O
and	O
compensate	O
for	O
real-time	O
changes	O
caused	O
by	O
temperature	O
variations	O
,	O
mechanical	O
vibrations	O
,	O
and	O
the	O
motion	O
of	O
things	O
in	O
the	O
environment	O
.	O
</s>
<s>
In-band	O
full	O
duplex	O
can	O
potentially	O
double	O
spectral	B-Protocol
efficiency	I-Protocol
.	O
</s>
<s>
And	O
it	O
enables	O
“	O
listen	O
while	O
talking	O
”	O
operation	O
(	O
see	O
cognitive	B-Protocol
radio	I-Protocol
,	O
below	O
)	O
.	O
</s>
<s>
Cable	O
Labs	O
developed	O
the	O
Full	O
Duplex	O
DOCSIS	B-Protocol
3.1	I-Protocol
standard	O
to	O
enable	O
symmetrical	O
service	O
at	O
speeds	O
up	O
to	O
10	O
Gbit/s	O
in	O
each	O
direction	O
.	O
</s>
<s>
In	O
DOCSIS	B-Protocol
3.1	I-Protocol
,	O
different	O
frequencies	O
are	O
allocated	O
for	O
upstream	O
and	O
downstream	O
transmissions	O
,	O
separated	O
by	O
a	O
guard	O
band	O
.	O
</s>
<s>
Full	O
Duplex	O
DOCSIS	B-Protocol
establishes	O
a	O
new	O
band	O
allowing	O
a	O
mix	O
of	O
upstream	O
and	O
downstream	O
channels	O
on	O
adjacent	O
channels	O
.	O
</s>
<s>
Mesh	B-Architecture
networks	I-Architecture
are	O
used	O
to	O
extend	O
coverage	O
(	O
to	O
cover	O
entire	O
homes	O
)	O
and	O
for	O
ad-hoc	O
networking	O
(	O
emergency	O
communication	O
)	O
.	O
</s>
<s>
Wireless	O
mesh	B-Architecture
networks	I-Architecture
use	O
a	O
mesh	B-Architecture
topology	I-Architecture
to	O
provide	O
the	O
desired	O
coverage	O
.	O
</s>
<s>
In	O
mesh	B-Architecture
networks	I-Architecture
using	O
a	O
single	O
frequency	O
,	O
the	O
data	O
is	O
typically	O
store-and-forwarded	O
,	O
with	O
each	O
hop	O
adding	O
a	O
delay	O
.	O
</s>
<s>
SIC	O
can	O
enable	O
wireless	O
mesh	B-Architecture
nodes	I-Architecture
to	O
reuse	O
frequencies	O
so	O
that	O
the	O
data	O
is	O
retransmitted	O
(	O
relayed	O
)	O
as	O
it	O
is	O
received	O
.	O
</s>
<s>
In	O
mesh	B-Architecture
networks	I-Architecture
using	O
multiple	O
frequencies	O
,	O
such	O
as	O
whole-home	O
Wi-Fi	O
networks	O
using	O
“	O
tri-band	O
”	O
routers	O
,	O
SIC	O
can	O
enable	O
greater	O
flexibility	O
in	O
channel	O
selection	O
.	O
</s>
<s>
Tri-band	O
routers	O
have	O
one	O
2.4GHz	B-Algorithm
and	O
one	O
5GHz	O
radio	O
to	O
communicate	O
with	O
client	O
devices	O
,	O
and	O
a	O
second	O
5GHz	O
radio	O
that	O
is	O
used	O
exclusively	O
for	O
internode	O
communication	O
.	O
</s>
<s>
For	O
instance	O
,	O
billions	O
of	O
Wi-Fi	O
and	O
Bluetooth	B-Protocol
devices	O
compete	O
for	O
access	O
to	O
the	O
ISM	B-Algorithm
bands	I-Algorithm
.	O
</s>
<s>
Smartphones	O
,	O
Wi-Fi	O
routers	O
,	O
and	O
smart	O
home	O
hubs	O
frequently	O
support	O
Wi-Fi	O
,	O
Bluetooth	B-Protocol
,	O
and	O
other	O
wireless	O
technologies	O
in	O
the	O
same	O
device	O
.	O
</s>
