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A High-speed/Low-power CSD Linear Phase FIR Filter Structure Using Vertical Common Sub-expression  

장영범 (이화여자대학교 정보통신학과)
양세정 (이화여자대학교 정보통신학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.27, no.4A, 2002 , pp. 324-329 More about this Journal
Abstract
In the high-speed/low-power digital filter applications like wireless communication systems, canonical signed digit(CSD) linear phase finite impulse response(FIR) filter structures are widely investigated. In this paper, we propose a high-speed/low-power CSD linear phase FIR filter structure using vertical common sub-expression. In the conventional linear phase CSD filter, horizontal common sub-expressions are utilized due to the inherent horizontal common sub-expression of symmetrical filter coefficients. We use the fact that their MSBs are also equal since adjacent filter coefficients have similar values in the linear phase filter Through the examples, it is shown that our proposed structure is more efficient in case that precision of implementation is lower, and tap length are longer.
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