FIR Filter Design Based on CSD and MSD Concepts for Fixed Applications

In some applications the coefficients of FIR filters are remain fixed. This paper describes the design of FIR filter for fixed applications. The FIR filter design using transpose form structure is usually a pipelined architecture and it holds MCM (multiple constant multiplications) technique. This MCM technique results in large computation saving. In this paper, the speed of FIR filter is increased by combining CSD (canonic signed digit) and MSD (minimal signed digit) representation of numbers. The MSD representation is suitable for common sub expression elimination method. It significantly reduces the number of adders needed for in the filter design process. The proposed structure significantly reduces the area delay product (ADP) and energy per sample (EPS) than the existing FIR structure.