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CALF: a CORDIC adaptive lattice filter

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2 Author(s)
Y. H. Hu ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; H. E. Liao

CALF is a CORDIC processor implementation of the adaptive lattice filter. Unlike previously reported results which simply use the CORDIC processor to implement the lattice algorithm formulated for conventional multiply-and-accumulate type arithmetic units, a novel adaptive normalized lattice algorithm which directly updates the rotation angles rather than the reflection coefficients is reported. Thus, this angle updating lattice algorithm is derived specifically for implementation with a VLSI CORDIC processor. Moreover, this algorithm was further modified to a sign-sign algorithm to take advantage of the fact that the CORDIC processors only rotate a finite number of distinct rotation angles. Computer simulation results showed good converging properties even at rather coarsely quantized angles

Published in:

IEEE Transactions on Signal Processing  (Volume:40 ,  Issue: 4 )