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18
In the above equation,
P
i
is the power allocated to the
i
th
channel and
λ
is a scaling factor. When
we differentiate the information capacity with respect to
P
i
, we get
P
i
=
υ
– N
i
where
N
i
is the
noise level on
i
th
channel. Also,
υ
is the ‘water level’ that satisfies
.
Now, the algorithm for the singleuser waterfilling technique can be written as follows:
Start
!
=
+
P
total
"
P
temp
N
P
temp
=
(
"
N
i
)
+
#
If
P
total
!
P
temp
"
tolerance
_
level
End
If
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This note was uploaded on 09/27/2009 for the course ECE 399 taught by Professor Prof during the Spring '09 term at University of Texas at Austin.
 Spring '09
 Prof

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