Contribution à la conception de systèmes en virgule fixe

Daniel Ménard 1
1 CAIRN - Energy Efficient Computing ArchItectures with Embedded Reconfigurable Resources
Inria Rennes – Bretagne Atlantique , IRISA-D3 - ARCHITECTURE
Abstract : My research activities are in the domain of efficient implementation of image and signal processing applications into embedded systems. Challenged by the increasing complexity of embedded systems and short time to market pressure, new techniques for system design and efficient tools to capture the complexity and help perform design activity are under perennial demand. The process of fixed-point refinement is an important step that occurs soon after application/algorithm design and before any kind of implementation effort. It is a long, tedious and error prone task. Our research objective is to propose efficient methods and to develop a tool for fixed-point refinement of systems. Different techniques for optimizing the implementation of applications in embedded systems have been the object of our study. The study focuses on digital communication applications, energy consumption and optimized fixed-point data representations. Evaluating the effects of finite precision is one of the major and often the most time consuming step while performing fixed-point refinement. An analytical approach based on perturbation theory has been proposed. In this approach, an expression for the quantization noise power at the output of a system composed of smooth operations is determined. For systems comprising of un-smooth operations, a technique that uses both simulation and analytical techniques, a mixed-approach, has been defined. Different contributions for automation of fixed-point conversion have been proposed. A stochastic approach for dynamic range evaluation of fixed-point systems, word-length optimization in the context of high-level synthesis and a divide-and-conquer approach based on hierarchical decomposition for fixed-point refinement of complex systems have been developed. A tool for automatic fixed-point conversion and numerical accuracy evaluation has been developed. Different works have been carried-out on the implementation of digital communication systems and the generation of IP blocks. Moreover, the concept of dynamic precision scaling (DPS) has been proposed and a flexible and reconfigurable architecture, supporting DPS, has been developed.
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  • HAL Id : tel-00719431, version 1

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Daniel Ménard. Contribution à la conception de systèmes en virgule fixe. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 2011. ⟨tel-00719431⟩

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