Motorola DSP96002 - Manual (Page 545)

B-26 DSP96002 USER’S MANUAL MOTOROLA
On the delayed LMS algorithm, the coefficients are updated with the error from the previous iteration while
the FIR filter is being computed for the current iteration. In the following implementation, two coefficients
are updated with each pass of the loop.
Delayed LMS Algorithm
iter equ 50 ;Number of LMS iterations
conv_fact equ 0.01 ;Convergence factor
org x:$0
state ds 11 ;State of lms fir
org y:$0
coef ds 10 ;LMS coefficients
e dc 0.0 ;Signal error
xin ds 1 ;Input to system
dsig ds 1 ;Desired signal
org p:$100
lmstest
move #state,r0 ;Set up address generators
move #10,m0
move #xstate,r1
move #9,m1
move #coef,r4
move #9,m4
move #coef,r5
move #9,m5
move #xcoef,r6
move #9,m6
move #iter,d0.l
do d0.l,lms
; LMS algorithm setup
move y:e,d0.s
move #conv_fact,d1.s
fmpy.s d0,d1,d0 y:xin,d6.s
move d0.s,d9.s
move d6.s,x:(r0)
; LMS algorithm loop