Thesis (M.A.)-University of KwaZulu-Natal, Durban, 2008.

Thesis (M.S.)--Brigham Young University. Dept. of Electrical and Computer Engineering, 2005. / Includes bibliographical references (leaves 105-107).

Thesis (Ph. D.)--University of Missouri-Columbia, 2005. / 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 (July 19, 2006) Vita. Includes bibliographical references.

Thesis (M.E.)--University of Canterbury, 2006. / Typescript (photocopy). "November 2006." Includes bibliographical references (leaves 121-124). Also available via the World Wide Web.

Thesis (MScEng)--Stellenbosch University, 2004. / Full text to be digitised and attached to bibliographic record. / ENGLISH ABSTRACT: The increase in the complexity and functionality of new satellites leads to a growing demand for a digital communication system operating at a much higher bit rate than before. The main purpose of this thesis is to address precisely this problem. The theory as well as a practical high speed system are custom-developed. The goal of this thesis is not to reinvent the wheel, but to use off-the-shelf products as far as possible. This system demonstrates that a very high data rate is not out of reach for a developer with limited funds. The secondary goal is to understand the operation of this communication system. The emphasis is on the inaccuracies in the system. A design tool is created to act as a vehicle for understanding the influence of a single variable on the performance of the entire system. / AFRIKAANSE OPSOMMING: Die toename in die kompleksiteit en funksionaliteit van nuwe satelliete lei tot die groeiende behoefte aan 'n digitale kommunikasiestelsel wat teen "n heelwat hoër bis spoed funksioneer. Die hoofdoel van hierdie tesis is om juis hierdie probleem aan te spreek. Die teorie en 'n praktiese hoëspoed stelsel is ontwikkel. Die doel van die tesis is nie om die wiel te herontdek nie maar om sover moontlik bestaande produkte in die ontwerp van die stelsel te gebruik. Die stelsel demonstreer dat 'n hoëspoed datatempo nie buite die bereik van 'n ontwikkelaar met beperkte fondse is nie. 'n Verdere doelwit is om die funksionering van die kommunikasie stelsel te begryp. Klem is gelê op die onakkuraathede in die kommunikasiestelsel. Ontwikkeling sagteware is geskep as "n metode om die invloed van "n enkele veranderlike op die werkverrigting van die stelsel as geheel te begryp.

Turbo-codes are a popular error correction method for applications requiring bit error rates from 10−3 to 10−6, such as wireless multimedia applications. In order to reduce the complexity of the turbo-decoder, it is advantageous to use the simplest possible constituent codes, such as 4-state recursive systematic convolutional (RSC) codes. However, for such codes, the error floor can be high, thus making them unable to achieve the target bit error range. In this dissertation, two methods of lowering the error floor are investigated. These methods are interleaver selection, and puncturing selective data bits. Through the use of appropriate code design criteria, various types of interleavers, and various puncturing parameters are evaluated. It was found that by careful selection of interleavers and puncturing parameters, a substantial reduction in the error floor can be achieved. From the various interleaver types investigated, the variable s-random type was found to provide the best performance. For the puncturing parameters, puncturing of both the data and parity bits of the turbo-code, as well as puncturing only the parity bits of the turbo-code, were considered. It was found that for applications requiring BERs around 10−3 , it is sufficient to only puncture the parity bits. However, for applications that require the full range of BER values, or for applications where the FER is the important design parameter, puncturing some of the data bits appears to be beneficial. / Graduate

Technological developments, Internet expansion and the ubiquity of smartphones have revolutionized modern communication. Millions of people link to countless desktops or mobile e-platforms, and information transfer has never been faster or simpler. Previous research has consistently found that online reviews can mould consumers' attitudes toward a product, thereby influencing sales (Chevalier and Mayzlin, 2006; Ante, 2009), and highlighting the importance of electronic word-of-mouth (eWOM) communication as a key factor affecting consumer purchasing decisions. Message quality plays a decisive role in eWOM communication effectiveness (Sweeney, Soutar and Mazzarol, 2008; Cheema and Kaikati, 2010). A persuasive message is comprised of two critical components, message valance and argument strength (Fishbein and Ajzen, 1975; Petty and Cacioppo, 1981), but understanding of their characteristics is limited. Until now, most eWOM investigations have ignored the written content of persuasive messages, tending to use quantitative measures, such as product ratings, to study WOM or eWOM communication (Schlosser, 2011). Additionally, the growing role of China in the global economy points to an increasingly important role for Chinese language communication. To-date English has been the primary language used in past eWOM studies, but findings from non-Chinese language studies may not apply to the Chinese language eWOM communications. The current study is intended to fill this gap. Grounded in the Elaboration Likelihood Model (ELM), this study aims to identify the message features of Chinese language eWOM communication and understand the combined effects of valence and argument strength on attitude and purchase intention have varying levels of persuasiveness in eWOM communication. The present study deepens the knowledge of eWOM communication because it integrates message features into the ELM of eWOM influence. It also extends Sweeny, Soutar and Mazzarol's (2012) traditional WOM study to the Chinese language eWOM context. Practically, this study introduces actual themes, languages and presentation approaches to product reviews that significantly or marginally affect a receiver's attitude toward a product and influence purchase intention. It provides an important reference for the eWOM givers on how to strengthen Chinese eWOM message content by understanding the message features of different review types.

Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2005 / With the growth of the personal computer industry, a number of households now contain two or more personal computers. The need to share resources such as printers, scanners and other PC peripherals has become evident. Communication between personal computers and other smart devices in the home is also required. This brings the emergence of home networking together with home automation. Home networking is the collection of elements to enable the connection and integration of multiple computing, control and communication devices. There are various options at this stage for home networking. One of the broadband options is indoor power line communication. The aim of the project was to evaluate a communication system capable of performing efficiently in South African Home Power line environment. In designing a communication system capable of performing in the harsh conditions which are presented in the home environment (noise, attenuation, phase distortion, etc.), a mathematical model that is representative of a typical suburban South African home power line is required. To aid the modeling process, an experimental network was constructed so measurements could be taken in a controlled environment. In conjunction with simulation, the model of the home power line network has aided the design of the data communication system. The project has involved: • Determining optimal specifications for the communication system. • Development of a home power line model representative of a typical South African suburban home environment. • Construction and measurement of an experimental power grid • Development of methods, algorithms and programs for the design of an OFDM PLC modem (in software) to optimal specifications. • Simulation development in MA1LAB of the OFDM Modem. • Comparison of different OFDM sub-modulation schemes for enhancing the communication system performance, In conclusion, the simulation model of the PLC modem correlates well with typical practical systems. Optimising throughput of the communication system and hardware development of the modem will form the basis for further research.

Orientador: José Antonio Siqueira Dias / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-19T07:47:20Z (GMT). No. of bitstreams: 1 Airoldi_Douglas_M.pdf: 6691455 bytes, checksum: c3353281e717bd0415dc9ce4a5762ba6 (MD5) Previous issue date: 2011 / Resumo: Este trabalho é parte de um projeto de pesquisa e desenvolvimento de uma rede de mini-medidores de energia, de baixíssimo custo, que se comunica com uma central, que armazena todas as informações relativas ao consumo de energia elétrica, de cada um dos pontos de consumo de uma residência. Ao fim de um período, fornece ao consumidor condições de analisar a distribuição do seu gasto com energia elétrica por ponto medido. Neste trabalho foi desenvolvido um sistema de comunicação de dados pela rede elétrica, também conhecida como Power Line Communication (PLC)). O hardware, de baixo custo, é composto por microcontrolador e um modem integrado que utiliza o processo Amplitude Shift Keying (ASK), com taxas de comunicação entre 600 e 1200 bps (bits por segundo). O firmware criado é composto de um protocolo que realiza a comunicação half-duplex entre duas estações de medição, permitindo ao transmissor da informação, saber se a mesma foi recebida com integridade / Abstract: This work is part of a research project and develops a network of mini-power meters, very low cost, which communicate with a central, which stores all information relating to the consumption of electricity, each of the points consumption of a residence. At one time, it gives the consumer the ability to analyze the distribution of its spending power by the measured point. We have developed a communication system for data grid, also known as Power Line Communication (PLC). The hardware, low cost, consists of microcontroller and an integrated modem that uses the process Amplitude Shift Keying (ASK), with communication rates between 600 and 1200 bps (bits per second). The firmware is created consisting of a protocol that performs half-duplex communication between two measuring stations, allowing the transmitter of information, whether it was received with integrity / Mestrado / Eletrônica, Microeletrônica e Optoeletrônica / Mestre em Engenharia Elétrica

M.Ing. (Electric and Electrical Engineering) / From the day the first 'apple' was eaten, a species of people existed that wants to misuse other people, This species is normally the first to use new technology to their advantage. It is essential for our own security to restrict the boundaries of their playing-field and to fill the field it self with potholes. This however should be a continuous process, for their dexterity tends to evolveas fast as new techniques are mastered. Firstly this thesis entails the analysis of the boundaries of the playing field of authentication systems without security. The boundaries of authentication systems with security is established with a unique technique. Concluding the first part of the thesis, a new method of code designing for this playing-field is proposed. Reordering the potholes on the playing-field is the subject of the second part of the thesis. Anew public key system is described for this purpose. A novel implementation of insertion/deletion error correcting codes is presented in this new system. To conclude the thesis, a thorough analysis of this public key system is presented.