<s>
Diversity	B-Protocol
gain	I-Protocol
is	O
the	O
increase	O
in	O
signal-to-interference	O
ratio	O
due	O
to	O
some	O
diversity	B-Protocol
scheme	I-Protocol
,	O
or	O
how	O
much	O
the	O
transmission	O
power	O
can	O
be	O
reduced	O
when	O
a	O
diversity	B-Protocol
scheme	I-Protocol
is	O
introduced	O
,	O
without	O
a	O
performance	O
loss	O
.	O
</s>
<s>
Diversity	B-Protocol
gain	I-Protocol
is	O
usually	O
expressed	O
in	O
decibels	O
,	O
and	O
sometimes	O
as	O
a	O
power	O
ratio	O
.	O
</s>
<s>
An	O
example	O
is	O
soft	B-Protocol
handoff	I-Protocol
gain	O
.	O
</s>
<s>
For	O
selection	B-Protocol
combining	I-Protocol
N	O
signals	O
are	O
received	O
,	O
and	O
the	O
strongest	O
signal	O
is	O
selected	O
.	O
</s>
<s>
When	O
the	O
N	O
signals	O
are	O
independent	O
and	O
Rayleigh	O
distributed	O
,	O
the	O
expected	O
diversity	B-Protocol
gain	I-Protocol
has	O
been	O
shown	O
to	O
be	O
,	O
expressed	O
as	O
a	O
power	O
ratio	O
.	O
</s>
