Design of Pipelined Lattice IIR Digital Filters

Lattice structures exhibit good finite word length properties. In some real-time applications, high speed is very crucial to the system performance along with finite word length effects. Although lattice filters can be pipelined but cut-set localization procedure, no sample rate increase can be achieved by that method. In this paper, a pipelining method in lattice digital filters is introduced. This pipelining method is based upon constrained IIR digital filter design method by which pipelined direct-form filters are designed. These direct-form filters are transformed to pipelined lattice digital filters. It is shown that the roundoff error and the number of multiplyadd operations of the resulting pipelined lattice filters are smaller than those of the pipelined lattice filters obtained by applying look-ahead on direct-form nonpipelined digital filters.