<s>
Blind	B-Algorithm
equalization	I-Algorithm
is	O
a	O
digital	B-General_Concept
signal	I-General_Concept
processing	I-General_Concept
technique	O
in	O
which	O
the	O
transmitted	O
signal	O
is	O
inferred	O
(	O
equalized	B-Algorithm
)	O
from	O
the	O
received	O
signal	O
,	O
while	O
making	O
use	O
only	O
of	O
the	O
transmitted	O
signal	O
statistics	O
.	O
</s>
<s>
Blind	B-Algorithm
equalization	I-Algorithm
is	O
essentially	O
blind	B-Algorithm
deconvolution	I-Algorithm
applied	O
to	O
digital	O
communications	O
.	O
</s>
<s>
Nonetheless	O
,	O
the	O
emphasis	O
in	O
blind	B-Algorithm
equalization	I-Algorithm
is	O
on	O
online	B-Algorithm
estimation	O
of	O
the	O
equalization	B-Algorithm
filter	I-Algorithm
,	O
which	O
is	O
the	O
inverse	O
of	O
the	O
channel	O
impulse	O
response	O
,	O
rather	O
than	O
the	O
estimation	O
of	O
the	O
channel	O
impulse	O
response	O
itself	O
.	O
</s>
<s>
This	O
is	O
due	O
to	O
blind	B-Algorithm
deconvolution	I-Algorithm
common	O
mode	O
of	O
usage	O
in	O
digital	O
communications	O
systems	O
,	O
as	O
a	O
means	O
to	O
extract	O
the	O
continuously	O
transmitted	O
signal	O
from	O
the	O
received	O
signal	O
,	O
with	O
the	O
channel	O
impulse	O
response	O
being	O
of	O
secondary	O
intrinsic	O
importance	O
.	O
</s>
<s>
The	O
estimated	O
equalizer	B-Algorithm
is	O
then	O
convolved	B-Language
with	O
the	O
received	O
signal	O
to	O
yield	O
an	O
estimation	O
of	O
the	O
transmitted	O
signal	O
.	O
</s>
<s>
The	O
solution	O
to	O
the	O
blind	B-Algorithm
equalization	I-Algorithm
problem	O
is	O
not	O
unique	O
.	O
</s>
<s>
Many	O
algorithms	O
for	O
the	O
solution	O
of	O
the	O
blind	B-Algorithm
equalization	I-Algorithm
problem	O
have	O
been	O
suggested	O
over	O
the	O
years	O
.	O
</s>
<s>
However	O
,	O
as	O
one	O
usually	O
has	O
access	O
to	O
only	O
a	O
finite	O
number	O
of	O
samples	O
from	O
the	O
received	O
signal	O
,	O
further	O
restrictions	O
must	O
be	O
imposed	O
over	O
the	O
above	O
models	O
to	O
render	O
the	O
blind	B-Algorithm
equalization	I-Algorithm
problem	O
tractable	O
.	O
</s>
<s>
Polyspectra	O
techniques	O
utilize	O
higher	O
order	O
statistics	O
in	O
order	O
to	O
compute	O
the	O
equalizer	B-Algorithm
.	O
</s>
