Objective
A research programme is proposed which has the following aims in its 1st phase.
- To refine the algorithms for LNS arithmetic, to offer better average accuracy than FP.
- To design an ALU cell for its economical implementation, and to show that this cell will perform at higher average speed than FP.
- To verify the superiority of the LNS design by simulated comparison with FP in a variety of general mathematical and DSP applications.
This work during the 1st phase will be aimed at finalising the arithmetic algorithms and proving their superiority over floating-point. Theoretical refinements will be made to the algorithms in order to achieve the targets for speed and accuracy. A software simulation will be made available with which the accuracy of the system can be evaluated against that of floating-point, and proven over a range of larger-scale applications. A software library of DSP applications will be built. A detailed ALU cell design will be done, and from this it will be shown that the device will meet the target speed, and that it can economically be fabricated.
Once the feasibility of the approach has been demonstrated and the objectives of the 1st phase have been achieved the project will enter into a second phase with the following aims:
- To fabricate the design, to produce the world's first LNS-based ALU with significant advantage over FP; and to test and verify this in real-time practical applications.
- To incorporate the ALU in commercial custom DSP devices, to allow independent verification.
- To develop a complete LNS-based microprocessor.
There is a world-wide demand for accurate, high-performance arithmetic devices. These find application in two primary areas : general-purpose computing (e.g. Intel Pentium) and digital signal processing (e.g. Texas Instruments 320C40).
Currently the universal technique for performing real arithmetic is floating-point. Rates of performance for devices using it are about 30 - 40 ns latency for 32-bit add. subtract and multiply. Division takes considerably longer, and all four operations are subject to a maximum half-bit rounding error.
There is, of course, a constant demand for higher speed and accuracy in almost any application area. Examples include the requirement or higher data-rates in FFT. Filtering and general-purpose arithmetic, evident throughout most areas of digital communications. image processing, radar and sonar, and desktop computing. Large specialised application areas are rapidly emerging, e.g. in multimedia and digital television. It is the objective of this project to increase the speed and accuracy at which real arithmetic can be performed by using the Logarithmic Number System (LNS), instead of floating-point.
In the LNS a real value is represented as its fixed-point logarithm. The primary advantage of the LNS is therefore that multiplication and division involve only a fixed-point addition or subtraction, and are thus performed in minimal time and with no rounding error. LNS addition and subtraction, however, have hitherto been considerably slower, less accurate or less precise than their floating-point counterparts, and have therefore nullified the advantages to be gained by using this technique. It is the objective of this project to develop LNS addition and subtraction techniques which are approximately as precise, fast and accurate as floating-point, and which in conjunction with LNS multiplication and division would therefore yield a substantial improvement in average speed and accuracy over floating-point.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences computer and information sciences software
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering computer hardware computer processors
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering signal processing
- engineering and technology electrical engineering, electronic engineering, information engineering information engineering telecommunications radio technology radar
- natural sciences mathematics pure mathematics arithmetics logarithmic functions
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
NE1 7RU NEWCASTLE UPON TYNE
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.