Abstract: Smart antennas systems (SAS’s) have gained a lot of interest due to the explosive growth in demand for mobile communications in the last few years to overcome practical challenges in providing the service. The main benefit of the SAS technology lies in its ability to exploit the spatial domain, on top of the temporal and frequency domains, to improve the transceiver performance. Uniform Circular Arrays (UCA’s) are of interest because of their natural ability to provide a full azimuth (i.e.
Abstract: Optical code division multiple access (OCDMA) is used recently as access method in optical fiber networks without the need for traffic management or system synchronization. It takes advantage of the sporadic use of channels by allowing many users to be simultaneously connected to the network. Among OCDMA systems, frequency-encoded optical code division multiple access (FE-OCDMA) deserves close attention because it solves many obstacles which appear in conventional OCDMA systems such as multiple access interference (MAI). In this work, an incoherent FE-OCDMA systems are modeled.
Abstract: In this thesis, the various aspects related to controlling induction motors are investigated. Different control strategies are explored. The direct torque control (DTC) strategy is studied in details and its relation to space vector modulation (SVM) is emphasized. A SVM-based DTC strategy is suggested and a controller design which is based on the strategy is presented. A Simulink model representing the controller is developed and verified through this of MATLAB work.
Abstract: The introduction of GPS (Global Positioning System) in modern guidance system has revolutionized the world of navigation in land, sea, air and even in space. This work deals with one of the most familiar implementations of GPS which is determining the direction of a moving object with respect to a reference point, determining the distance between this object and that point, with the ability of displaying the motion on a corresponding map. This project is done by making an interaction between the hardware and software parts.
Abstract: In this thesis, an overview of traditional multiple access techniques were presented. Advantages and disadvantages of each system were outlined. A classification of CDMA systems was given. The DS-CDMA was analyzed and a formula for evaluation the BER performance of the system was given. Three modern CDMA system were discussed, namely, Directsequnce-CDMA (DS-CDMA), Multicode CDMA (MC-CDMA) and Multicode-Multicarrier-CDMA (MC-MC-CDMA). The three systems were analyzed and formulas for evaluating the BER performance of the three systems were given.
Abstract: This thesis presents an FIR digital filter design, simulation and FPGA based implementation. Due to the importance of FIR filter in DSP, FIR filters can create transfer functions that have no equivalent in linear circuit technology. They can offer shape factor accuracy and stability equivalent to very high-order linear active filters that cannot be achieved in the analog domain.
Abstract: This thesis presents the design methodology for the analog circuits using the genetic algorithm. Matlab is used as a tool to implement the GA (Genetic Algorithm) to analog circuits design problems as it is considered to be easy and robust with powerful features. Several analog circuits like operational amplifier circuits (inverting and non-inverting amplifiers), active filters and multistage amplifier circuits have been designed using the proposed genetic algorithm.
Abstract: As electrical power industry enters the new century, Computer-based Supervisory Control and Data Acquisition (SCADA) systems have been evolved from standalone, traditional compartmental operations into networked architectures that communicate through computer networks across large distances.
Abstract: A major challenge in broadband MIMO-OFDM system is how to obtain the Channel State Information (CSI) accurately and promptly for coherent detection of information symbols and channel tracking. This thesis formulates the channel estimation problems for MIMO-OFDM systems and proposes a pilot-tone based estimation algorithms. The complex equivalent baseband MIMO-OFDM signal model is derived using matrix representation.
Abstract: During the last decade, smart cards have become a widespread digital device. Advantages of smart cards are, for instance, low development costs and thepossibility to obtain a high degree of stability and security. They are frequently used for sensitive applications like money withdrawal or identification systems. The secured identification mechanism of smart cards depends on protocol which can be built in optimized hardware by using a Hash function whereas the heart core for any Hash function is an encryption cipher.