<s>
Spectrum	B-Algorithm
pooling	I-Algorithm
is	O
a	O
spectrum	B-Algorithm
management	I-Algorithm
strategy	O
in	O
which	O
multiple	O
radio	O
spectrum	O
users	O
can	O
coexist	O
within	O
a	O
single	O
allocation	O
of	O
radio	O
spectrum	O
space	O
.	O
</s>
<s>
Spectrum	B-Algorithm
pooling	I-Algorithm
schemes	O
generally	O
require	O
cognitive	B-Protocol
radio	I-Protocol
techniques	O
to	O
implement	O
them	O
.	O
</s>
