On design of a multiplierless very sharp Hilbert transformer by using identical subfilters

This paper presents an efficient and simple method for designing multiplierless very sharp Hilbert transformers. We use identical low-order Hilbert transformers as subfilters and the tapped cascaded interconnection of the subfilters is provided by a simple prototype filter. In order to obtain an overall multiplierless design, the rounding is applied to the coefficients of prototype filter and all subfilters. Additionally, we propose to employ the Pipelining/Interleaving (P/I) technique and the Common Subexpression Elimination (CSE) method for savings in the number of adders.