An estimation-based approach to the design of adaptive IIR filters

We present an estimation-based approach to the design of adaptive IIR filters. We also use this approach to design adaptive filters when a feedback signal from the output of the adaptive filter contaminates the reference signal. We use an H/sub /spl infin// criterion to cast the problem as a nonlinear H/sub /spl infin// filtering problem, and present an approximate linear H/sub /spl infin// filtering solution. This linear filtering solution is then used to adapt the adaptive IIR Filter. The presentation of the proposed adaptive algorithm is done in the context of an adaptive active noise cancellation problem. Simulations are used to examine the performance of the proposed estimation-based adaptive algorithm.