<s>
Time	B-Protocol
diversity	I-Protocol
is	O
used	O
in	O
digital	O
communication	O
systems	O
to	O
combat	O
that	O
the	O
transmissions	O
channel	O
may	O
suffer	O
from	O
error	O
bursts	O
due	O
to	O
time-varying	O
channel	O
conditions	O
.	O
</s>
<s>
Time	B-Protocol
diversity	I-Protocol
implies	O
that	O
the	O
same	O
data	O
is	O
transmitted	O
multiple	O
times	O
,	O
or	O
a	O
redundant	O
error	B-Error_Name
correcting	I-Error_Name
code	I-Error_Name
is	O
added	O
.	O
</s>
