Digital filtering using the multidimensional logarithmic number system

Vassil S. Dimitrov; Graham A. Jullien; Konrad Walus

doi:10.1117/12.452047

6 December 2002 Digital filtering using the multidimensional logarithmic number system

Vassil S. Dimitrov, Graham A. Jullien, Konrad Walus

Proceedings Volume 4791, Advanced Signal Processing Algorithms, Architectures, and Implementations XII; (2002) https://doi.org/10.1117/12.452047
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We introduce the use of multidimensional logarithmic number system (MDLNS) as a generalization of the classical 1-D logarithmic number system (LNS) and analyze its use in DSP applications. The major drawback of the LNS is the requirement to use very large ROM arrays in implementing the additions and subtraction and it limits its use to low-precision applications. MDLNS allows exponential reduction of the size of the ROMs used without affecting the speed of the computational process; moreover, the calculations over different bases and digits are completely independent, which makes this particular representation perfectly suitable for massively parallel DSP architectures. The use of more than one base has at least two extra advantages. Firstly, the proposed architecture allows us to obtain the final result straightforwardly in binary form, thus, there is no need of the exponential amplifier, used in the known LNS architectures. Secondly, the second base can be optimized in accordance to the specific digital filter characteristics. This leads to dramatic reduction of the exponents used and, consequently, to large area savings. We offer many examples showing the computational advantages of the proposed approach.

Citation Download Citation

Vassil S. Dimitrov, Graham A. Jullien, and Konrad Walus "Digital filtering using the multidimensional logarithmic number system", Proc. SPIE 4791, Advanced Signal Processing Algorithms, Architectures, and Implementations XII, (6 December 2002); https://doi.org/10.1117/12.452047

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