A High-Performance 8-Tap FIR Filter Using Logarithmic Number System

—This paper presents an approach to implement a high-performance 8-tap digital FIR (Finite Impulse Response) filter using the Logarithmic Number System. In the past, FIR filters were implemented by a conventional number system; their speed was limited because of the multiply-accumulate operations. We realize a fast FIR filter by utilizing the Logarithmic Number System, which allows a simple implementation of multiplication using a fixed-point adder. And the serious demerit of Logarithmic Number System’s algorithm, conversions to and from the conventional number representations, is effectively overcome by pipelining to reduce the delay and complexity of the filter. The critical path was reduced from a multiply-accumulate operation

• Type: Journal
• Year: 2011
• Where: ICC
• Authors: Yan Sun, Min Sik Kim
• Keywords: Communications, Finite Impulse Response, ICC 2011, Number Representations, Point Adder