Some efficient digital prefilter structures

A new approach to the design of low complexity FIR digital filters was presented in [1]. The essence of the method is to separate the design problem into two parts: the realization of an efficient prefilter and the design of the corresponding equalizer. This separation allows the filter designer to focus on the computational complexity issue within the simplified context of the prefilter network. In this paper, we consider the use of various digital prefilter structures. The number of possibilities for digital prefilters is unlimited, so that our treatment cannot be exhaustive. However, our study does provide a quantitative sense of the level of reduction in computational complexity that can be achieved by the use of an appropriately designed prefilter.