Design of Frequency Sampling Filters Using Cyclotomic Polynomials
Uwe Meyer-Base, · Frequenz · 1998
Frequency sampling filters (FSFs) are of interest to designers of filter banks due, in part, to their intrinsic low complexity and linear phase behavior. FSF designs rely on exact pole-zero annihilation and are often found in embedded applications. Exact FSF pole-zero annihilation can be guaranteed by using polynomial filters defined over an integer ring in the residue number system (RNS) along with algebraic integers. An FPGA implementation example is presented which offers an 86% complexity reduction compared with standard nonrecursive FIR designs.