Customization of Session Initiation Protocol Express Router for the University of Khartoum

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Characteristics of Radio Wave Propagation Through Trees at 2.1 GHz for UMTS System

This is the final thesis report of M.Sc. research project to study the characteristics of radio wave propagation though vegetation medium at 3G-UMTS frequencies for Middle East type of tress. The excess signal attenuation at 2.1 GHz through Phoenix Date Palm, Conocarpu erectue and Ziziphus Spina Christi trees is investigated though intensive measurement experiments carried out during May-June...

Communication in Distributed Systems

The past 1980’s witnessed two advances in technology. The first was the development of powerful microprocessors. The second invention was the high speed local area networks or LANs. These two developments permitted putting together computing systems composed of large numbers of CPUs connected by a high-speed network, thus allowing transfer of information between machines in milliseconds. Such...

Design of MultiProtocol Label Switching Virtual Private Network

The common ways to connect Virtual Private Networks (VPNs) have been through the use of Asynchronous Transfer Mode (ATM) or Frame Relay (FR) or leased link supplied by a service provider. This is increasingly becoming less than ideal solution. The ideal solution is to use A MultiProtocol Label Switching (MPLS). The implementation of VPN using MPLS has several advantages like making routes...

Designing Spreading/Despreading Signals to Enhance Interference Rejection Capability in Direct Sequence Spread Spectrum System

The process gain advantage of a DS system may be compromised when operating in a hostile environment. A determined enemy may render the system inoperative through the use of single tone, multiple tones or swept (chirp) jamming, particularly if the interference frequency is close to the DS carrier frequency. Therefore, some measures should be taken to enhance the inherent interference resistance...

An Investigation of Stability Analyses of the Variable-Frequency Inverter-Fed Induction Motor Drive

This thesis is concerned with an investigation of the results of two important works that have dealt with the steady-state stability of the inverter-fed induction motor drive aiming at the development of user-friendly Matlab programs that will enable a comparative study of the conclusions drawn by the two works. Whereas the first which has been developed in reference [1] is centered on the...

Real-Time Scheduling In Multiprocessor Systems

As a result of the development of computing, especially in automotive market and other fields, the standard uniprocessor microcontroller architecture will not be able to support the needed computing power even taking into account the IC technology advances. To increase computational power, multiprocessor real-time systems introduced. Scheduling algorithm used in some applications like UNIX...

A Power Electronics Labrotary Manual

Power electronics is very important field. Electronic equipments require switch mode dc power supplies, and uninterruptible power supplies. Electric trains and electric vehicles used to reduce smog and pollution. Adjustable speed motor drive, the transmission of power over high voltage dc lines, and the interconnection of photovoltaic and wind-electric systems to the utility grid are...

Assessment of Spectrum Utilization in Dynamic Spectrum Access systems

The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. This new networking paradigm is referred to as Dynamic Spectrum Access (DSA). The current thesis concerned with the dynamic spectrum access, where useful multiple access techniques (CDMA) with spreading spectrum...

A Proposed E-learning System

Remarkable advances in communications and computer networking and the development and availability of the Internet everywhere and anytime have led to new approaches and techniques in learning which are given the term E-Learning. This thesis is based on huge information now available through the internet and the international libraries and media concerning the topic from which it tries to...