IGLOO2 FPGA Adaptive FIR Filter Demo Guide
Revision 2
7
EQ 1
where,
According to
EQ 1
, narrow-band component y(n), is the adaptive filter output
h(n) is the filter coefficients
x(n-
) is the input signal to the adaptive filter
l is the length of the filter (number of taps)
k is the index variable
The error is computed using the following equation:
e(n)= d(n)- y(n)
EQ 2
where,
e(n) is the error signal
d(n) is desired signal
The filter coefficients are updated using the following equation:
h(n+1)=h(n)+µ*e(n)*x(n-
)
EQ 3
where,
h(n+1) is the estimated filter coefficients
h(n) is present filter coefficients
µ is the step size factor
y n
h n
k
0
=
k
l
1
–
=
x n
–
k
–
=
Superseded
