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A Theoretical Framework For Quality Estimation And Optimization Of DSP Applications Using Low-power Approximate Adders

A THEORETICAL FRAMEWORK FOR QUALITY ESTIMATION AND OPTIMIZATION OF DSP APPLICATIONS USING LOW-POWER APPROXIMATE ADDERS

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  • TVMAFE23
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A THEORETICAL FRAMEWORK FOR QUALITY ESTIMATION AND OPTIMIZATION OF DSP APPLICATIONS USING LOW-POWER APPROXIMATE ADDERS

In this paper, we present a framework for analytically estimating the output quality of common digital signal processing (DSP) blocks that utilize approximate adders. The framework is based on considering the error of approximate adders as an additive noise (approximation noise) that disturbs the output of the DSP block in question. A signal processing theoretical modeling approach for describing the power of the approximation noise which is the integral of error spectral density over the bandwidth, is developed. The output qualities of DSP blocks, such as finite impulse response filter, discrete cosine transform, and fast Fourier transform, which utilize approximate adders, are thus estimated. The accuracy of the proposed framework is evaluated by comparing mathematical model predictions to simulation results by using the signal-to-noise ratio (SNR) metric. The inaccuracy of the SNRs predicted by the framework was, on average, less than 2.5dB compared with that obtained from simulations. Therefore, a mathematical optimization approach based on Lagrange Multipliers for optimizing
design parameters is also presented. The optimization is realized by choosing a proper configuration of the target block, such as determining the data width of the inexact computation part for each approximate adder in the design.

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