
205
Power amPlifier linearization
where
−
can be given by
Srnm crnm[( )]
m
k
k
K
)
1
∑
−= −
−
=
(6.19)
and,
yn rn mS rn mrnS rn
() ()[( )] () [()]
m
m
2
=0
0
2
2
∑
=− −=
(6.20)
From the preceding equations it can be shown that the power
amplifier model shown by the memory polynomial is not the only
way to represent the memory of the power amplifier, and in fact the
other way to model the memory effects according to Equation (6.20)
is based on the complex gain coefficient modeling. Here, it is shown
that the proposed scheme represents more memory content, and in
addition, the complexity to extract the coefficients of the memory ...