Based on a Ph.D. thesis in the Dept. of Electrical Engineering, 1968. / Bibliography: p.125-126.

Simulation and experiments quantify the effect of moving a horizontal dipole antenna close to a metal ground plane. Solutions to the radiation problems are offered.

Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 158-174). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 158-174). Also available on the Internet.

M. Tech. Electronic Engineering. / Monitoring manufacturing plants, military surveillance or enhancing audio signals in a noisy environment are few of the many applications that can benefit from acoustic signal localization. The objective of the project is to design a system that is able to locate an acoustic source using a linear array of omni-directional microphones. The signal outputs of the array are fed into a PC, which processes the data, using a MATLAB-based program. The acoustic source is considered to be unique and stationery. The location of the source will be done by determining the Direction of Arrival (DOA) of the audio signal. This research does not tackle the issue of determining the distance between the source and the array of microphones. "Beamforming" methods are implemented to determine the DOA. The conventional "beamforming" method was compared with higher resolution techniques such as adaptive filtering. Computer simulations of the algorithms were performed, followed by practical experiments. A Field Programmable Gate Array (FPGA) was used to enable a real time acquisition of signals from an array of microphones and the communication interface to the PC was accomplished via the USB interface. The results show that the system can detect the direction of arrival properly and provide the user with lower signal to noise ratio (SNR) reconstructed signals.

Thesis (M.S.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 7, 2008) Includes bibliographical references.

Thesis (M. App. Sc.)--Carleton University, 2001. / Includes bibliographical references (p. 126-131). Also available in electronic format on the Internet.

Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Electrical Engineering, 2008. / Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

M.Ing. (Electrical and Electronic Engineering) / Power line communications have been in use since the early 1900‟s. The early use of this technology was mostly found within utility companies where it was used for intra telephonic service over the electrical distribution network. This technology has evolved remarkably to include not only low voltage medium and high voltage electric network but it has also extended to home automation and network. Literature on power line communications has pointed out major hindrances such as cable characteristics, impedance variations and noise signals from various sources. Most importantly, noisy characteristics of power line channels make it difficult to transmit information data in an effective and reliable way. More often data transmitted through power line channels is corrupted by three main types of noise, the background noise, the impulse noise and the permanent frequency disturbances. Consequently, researchers have focused on the optimum use of power line channel through combining channel coding and modulation schemes. In this study, we have, through simulations and practical experimentations, investigated the performance of a new mapping technique called “frequency mapping” over power line channel. The study material began with reviews of channel coding, modulation and permutation codes schemes. Further we presented through computer simulation, the inherent benefit of using permutation codes obtained through construction technique. Secondly, we detailed the use of Hadamard transform to produce frequency sequences. In reality, sign changes, drawn from observing Hadamard matrix and Walsh functions, were conceptualised as frequencies from which frequency sequences were produced. This technique termed “frequency mapping” showed effectiveness against narrow band noise in simulation environment. The study closed with an experimental verification of this new technique through custom designed communication system on a real power line channel where we observed a net BER performance gain when frequency sequences are ordered through Hadamard transform.