Finite delay maximum SNR breadth-first equalizer

A finite delay breadth-first equalizer for intersymbol interference (ISI) channels is presented. Based on the maximum signal-to-noise ratio (SNR) criterion, optimal structures for all breadth-first equalizers are found. Recursive algorithms for the Ungerboeck and the Forney structures are developed, which are parallel to the structures of the well-known maximum likelihood sequence detector (MLSD).