<s>
In	O
radio	O
,	O
a	O
guard	B-Algorithm
band	I-Algorithm
is	O
an	O
unused	O
part	O
of	O
the	O
radio	B-Algorithm
spectrum	I-Algorithm
between	O
radio	B-Algorithm
bands	I-Algorithm
,	O
for	O
the	O
purpose	O
of	O
preventing	O
interference	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
frequency-division	B-Protocol
multiplexing	I-Protocol
.	O
</s>
