Highspeed digital filtering Structures and finit

Authors: K S Arun D R Wagner

Publish Date: 1992/11/01

Volume: 4, Issue: 4, Pages: 355-370

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Abstract

This paper is a study of highthroughput filter structures such as block structures and their behavior in finite precision environments Block structures achieve high throughput rates by using a large number of processors working in parallel It has been believed that block structures which are relatively robust to roundoff noise must also be robust to coefficient quantization errors However our research has shown that block structures in fact have high coefficient sensitivity A potential problem that arises as a result of coefficient quantization is a periodically timevarying behavior exhibited by the realized filter We will demonstrate how finite wordlength errors can change a nominally timeinvariant filter into a timevarying system We will identify the block structures that have low coefficient sensitivity and develop highspeed structures that are immune to the timevarying problems caused by coefficient quantization

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