Improvement Of The Orthogonal Code Convolution Capabilities Using FPGA Implementation

Improvement of the orthogonal code convolution capabilities using FPGA implementation

Abstarct:

When data is stored, compressed, or communicated through a media such as cable or air, sources of noise and other parameters such as EMI, crosstalk, and distance can considerably affect the reliability of these data. Error detection and correction techniques are therefore required. Orthogonal Code is one of the codes that can detect errors and correct corrupted data. An n-bit orthogonal code has n/2 is and n/2 0s. In a previous work these properties have been exploited to detect and correct errors. In this paper we present a new methodology to enhance error detection capabilities of the orthogonal code. The technique was implemented experimentally using field programmable gate arrays (FPGA). The results show that the proposed technique improves the detection capabilities of the orthogonal code by approximately 50%, resulting in 99.9% error detection, and corrects as predicted up to (n/4-1) bits of error in the received impaired code with bandwidth efficiency.
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Regenerative Braking By Electric Hybrid Vehicles Using Super Capacitor And Power Splitting Generator

Regenerative Braking By Electric Hybrid Vehicles Using Super Capacitor And
Power Splitting Generator

Abstract:
Experimental electric hybrid car drive of the small power was implemented in the laboratory of Josef Bozek Research Center of Engine and Automotive Technology at the Technical University in Prague. The output is 7.5 kW, 0 - 6000 min-' . The super capacitor as a peak energy storage has lOOF, 56V and 400 A. It is able to accept the kinetic energy during breaking the vehicle of the mass 1500kg from the velocity 60km/hour and regenerate it during next speeding up. The laboratory measurements during regeneration are published in the paper.
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Author:Zdenek Cerovsky Pavel Mindl
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A Modeling Methodology for Real-Timemultimedia Operating Systems

A Modeling Methodology for Real-Timemultimedia Operating Systems

Real-time scheduling theory attempts to guarantee that a
real-time task set will always meet its deadlines. Historically,
there has existed a wide gap between real-time scheduling
theory and the reality of applying the theory to task sets
implemented via real-time operating systems (RTOSs). This
paper provides aftamwork to account for implementation
costs in real-time scheduling theory. In addition, an
engineering methodology that allows users and developers
to accurately model and evaluate RTOSs is presented. We
use this methodology to model three dinerent commercial
real-time operating systems that are being used in
multimedia applications. We show how to use the RTOS
scheduling models to evaluate the performance and design
of RTOSs. Subscribe to Complete IEEE Topics and Abstract by Email For more IEEE Topics .

Author :- Kevin A. Kettler, Daniel I. Katcher, anid Jay K. Strosnider'
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