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Articles 1 - 8 of 8
Full-Text Articles in Engineering
Modulation Classification Of Digital Communication Signals, Visalakshi S. Ramakonar
Modulation Classification Of Digital Communication Signals, Visalakshi S. Ramakonar
Theses: Doctorates and Masters
Modulation classification of digital communications signals plays an important role in both military and civilian sectors. It has the potential of replacing several receivers with one universal receiver. An automatic modulation classifier can be defined as a system that automatically identifies the modulation type of the received signal given that the signal exists and its parameters lie in a known range. This thesis addresses the need for a universal modulation classifier capable of classifying a comprehensive list of digital modulation schemes. Two classification approaches are presented: a decision-theoretic (DT) approach and a neural network (NN) approach. First classifiers are introduced …
A Cmos Imager With Pfm/Pwm Based Analog-To-Digital Converter, Amine Bermak
A Cmos Imager With Pfm/Pwm Based Analog-To-Digital Converter, Amine Bermak
Research outputs pre 2011
An on-pixel analog-to-digital converter based on both PFM and PWM schemes is reported. The proposed architecture uses a limited number of transistors that can be implemented in a small silicon area resulting in a 23% fill-factor. The digital sensor can be externally configured in order to operate under either the PFM or PWM scheme. At high light intensities, the PFM scheme is replaced by the PWM scheme which proves to be much more efficient in terms of power consumption and clock frequency requirements. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to …
Image Capture Using Integrated 3d Softchip Technology, Stefan Lachowicz, Alexander Rassau, Geoffrey Alagoda, Kamran Eshraghian, Myung-Ok Lee, Seung-Min Lee
Image Capture Using Integrated 3d Softchip Technology, Stefan Lachowicz, Alexander Rassau, Geoffrey Alagoda, Kamran Eshraghian, Myung-Ok Lee, Seung-Min Lee
Research outputs pre 2011
Mobile multimedia communication has rapidly become a significant area of research and development. The processing requirements for the capture, conversion, compression, decompression, enhancement, display, etc. of high quality multimedia content places heavy demands even on current ULSI (ultra large scale integration) systems, particularly for mobile applications where area and power are primary considerations. The system presented is designed as a vertically integrated (3D) system comprising two distinct layers bonded together using indium bump technology. The top layer is a CMOS imaging array containing analog-to-digital converters, and a buffer memory. The bottom layer takes the form of a configurable array processor …
Applications Of Liquid Crystal Spatial Light Modulators In Optical Communications, Selam Ahderom, Mherdad Raisi, Kungmang Lo, Kamal E. Alameh, Rafie Mavaddat
Applications Of Liquid Crystal Spatial Light Modulators In Optical Communications, Selam Ahderom, Mherdad Raisi, Kungmang Lo, Kamal E. Alameh, Rafie Mavaddat
Research outputs pre 2011
Advances in liquid crystal (LC) materials and VLSI technology have enabled the development of multi-phase spatial light modulators (SLM) that can perform high-resolution, dynamic optical beam positioning as well as temporal and spatial beam shaping in the 1550 nm optical communication window. These attractive features can effectively be used to achieve optical switching, optical spectral equalization, tunable optical filtering and many other functions that are important for future reconfigurable optical telecommunication networks. We review potential optical telecommunication applications based on LC-SLMs.
Mobile Home Security With Gprs, Duy Nguyen
Mobile Home Security With Gprs, Duy Nguyen
Theses : Honours
This thesis presents the results of an honours project on the development of a security system for use on mobile devices. Mobile Home Security (MHS) is a prototype system that aimed to fully investigate a potential use of the wireless high-speed technology General Packet Radio Service (GPRS) in transmitting video from a static location. This thesis Mobile Home Security with GPRS describes in detail the design and developmental stages for the system. The research focused on the sending of video from a security capture device over a high speed radio network. The first stage of the research involved the design …
Growth Dependant Properties Of Undoped And In-Situ Doped Chemically Deposited Cds Thin Films, Aaron John Reynolds
Growth Dependant Properties Of Undoped And In-Situ Doped Chemically Deposited Cds Thin Films, Aaron John Reynolds
Theses : Honours
This research project examines the growth dependant properties and composition of Cadmium Sulfide thin films produced by the Chemical Bath Deposition Method. The specific areas investigated are the effect of deposition temperature, the effect of an Indium dopant on the films structure and properties, and the effects of post deposition processing such as annealing in air on the film composition. The chemical bath deposition apparatus used has been refined and tested to ensure that the films were grown in a more efficient manner than previously, with more control of the influencing deposition parameters such as temperature. Films grown by the …
Design And Analysis Of Optical Layouts For Free Space Optical Switching, Kung-Meng Lo
Design And Analysis Of Optical Layouts For Free Space Optical Switching, Kung-Meng Lo
Theses: Doctorates and Masters
The Intelligent Reconfigurable Optical Switch (IROS) is an N x N optical switch that uses two reflective Liquid Crystal (LC) Spatial Light Modulators (SLM} in a "Z" configuration to steer the incoming beams from the input ports to the designated output ports. Currently, the maximum steering capacity of practical SLM is limited to few degrees. For a dense optical switch, this makes the optical path between the input and output fiber ports relatively long. When a Gaussian beam is switched from an input fiber port to an output fiber port in a long free space interconnection topology, the beam's illumination …
Factors Affecting The Bit Error Rate Performance Of The Indoor Radio Propagation Channel For 2.3-2.5 Ghz Frequency Band, Edward A. Walker
Factors Affecting The Bit Error Rate Performance Of The Indoor Radio Propagation Channel For 2.3-2.5 Ghz Frequency Band, Edward A. Walker
Theses: Doctorates and Masters
The use of wireless in buildings based on microwave radio technology has recently become a viable alternative to the traditional wired transmission media. Because of the portable nature of radio transceivers, the need for extensive cabling of buildings with either twisted pair, coaxial, or optical fibre cable is eliminated. This is particularly desirable where high user mobility occurs and existing wiring is not in place, or buildings are heritage in nature and extensive cabling is seen as intrusive. Economic analysis bas also shown that significant labour cost savings can result by using a radio system or a hybrid mix of …