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Now showing items 61-70 of 72
Reliability-based Detection of Variable-rate Space-time Block Codes
(2008-09-27)
We present a new sub-optimal near-maximum-likelihood (ML) detection
method for the family of variable-rate space-time block codes
(VRSTBC). The proposed detection method is based on the concept of
symbol reliability and ...
A new efficient CSI signalling strategy for MMR Systems with optimal detection
(2008-08-14)
We present a new Channel State Information (CSI) signalling strategy for single-
branch Mobile Multihop Relay (MMR) systems. This novel signalling strategy reduces the signalling overhead at each relay by at least 50%, ...
Using Complexity, Coupling, and Cohesion Metrics as Early Indicators of Vulnerabilities
(2009-09-28)
Software security failures are common and the problem is growing. A vulnerability is a weakness in the software that, when exploited, causes a security failure. It is difficult to detect vulnerabilities until they manifest ...
MOSFET Current Source Gate Drivers and Topologies for High Efficiency and High Frequency Voltage Regulator Modules
(2009-04-23)
With fast development of semiconductor industry, the transistors in microprocessors increase dramatically, which follows the Moore’s law. As a result, the operating voltages of the future microprocessors follow the trend ...
High Performance Digital Control Techniques for Powering Microprocessors
(2009-04-14)
Increasing power consumption and heat dissipation are becoming urgent challenges for processors today and in the future. Digital power control architectures in which processors closely interact with voltage regulators are ...
A New Power Signal Processor for Converter-Interfaced Distributed Generation Systems
(2009-01-27)
Environmentally friendly renewable energy technologies such as wind and solar energy systems are among the fleet of new generating technologies driving the demand for distributed generation of electricity. Power Electronics ...
MOSFET Current Source Gate Drivers, Switching Loss Modeling and Frequency Dithering Control for MHz Switching Frequency DC-DC Converters
(2008-02-29)
The power density of a switching converter is dependent on the size of the power circuit components. Converters are operated in the hundreds of kHz to achieve high power density since the size of the converter reactive ...
Single Stage Power Factor Corrected Three-Level Resonant Converters
(2008-02-01)
In this thesis, a new approach for single-stage power factor correction converters is proposed to increase their power ratings to be in the multiple kilowatts levels. The proposed techniques are based on the utilization ...
A Series-Parallel Resonant Topology and New Gate Drive Circuits for Low Voltage DC to DC Converter
(2008-01-31)
With rapid progress in microelectronics technology, high-performance Integrated Circuits (ICs) bring huge challenge to design the power supplies. Fast loop response is required to handle the high transient current of ...
Impact Study of Multimode Fibre Taper in Modal Noise Under Restricted Offset Launch Conditions
(2007-11-15)
Delivering high bandwidth to the individual household or small business is currently a major bottleneck in the high speed network, a problem referred to as the last mile issue. Multimode fibre is widely deployed in the ...