FPGA implementation of affine projection adaptive filter using coordinate descent iterations

In this paper, we present an FPGA implementation of a low complexity affine projection (AP) adaptive filtering algorithm based on a novel low complexity recursive filtering technique and filter update that is incorporated in dichotomous coordinate descent iterations. This adaptive algorithm is simple for finite precision implementation, requires small chip resources, and exhibits numerical stability. For the projection order 8 and filter lengths 16 to 512 the design occupies an area smaller than 2900 FPGA slices.