Interfacing power line communications and visible light communications based on phase shift keying and colour shift keying
- Authors: Ndjiongue, Alain Richard
- Date: 2017
- Subjects: Telecommunication systems , Digital communications , Signal theory (Telecommunication) , Wireless communication systems
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/233107 , uj:23794
- Description: D.Ing. , Abstract: Please refer to full text to view abstract
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- Authors: Ndjiongue, Alain Richard
- Date: 2017
- Subjects: Telecommunication systems , Digital communications , Signal theory (Telecommunication) , Wireless communication systems
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/233107 , uj:23794
- Description: D.Ing. , Abstract: Please refer to full text to view abstract
- Full Text:
Error control coded data transmision over FM supplementary signal transmission radio channels
- Authors: Steyn, Pieter
- Date: 2015-10-13
- Subjects: Radio frequency modulation - Transmitters and transmission , Data transmission systems , Signal theory (Telecommunication) , Electronic noise , Signal processing - Digital techniques , Error-correcting codes (Information theory)
- Type: Thesis
- Identifier: uj:14289 , http://hdl.handle.net/10210/14748
- Description: M.Ing. (Electrical and Electronic Engineering) , With all the talk about the Information Highway and its construction, there is also a channel which is highly underestimated and thus almost ignored. On normal FM radio transmissions extra bandwidth exists, suitable for the transmission of audio and data. In this thesis the effects of interference on data transmission over the Supplementary Signal Transmission (SST) channel are analysed. The channel is characterized in terms of the Bit Error Rate (BER) versus field strength and distance from a transmitter ...
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- Authors: Steyn, Pieter
- Date: 2015-10-13
- Subjects: Radio frequency modulation - Transmitters and transmission , Data transmission systems , Signal theory (Telecommunication) , Electronic noise , Signal processing - Digital techniques , Error-correcting codes (Information theory)
- Type: Thesis
- Identifier: uj:14289 , http://hdl.handle.net/10210/14748
- Description: M.Ing. (Electrical and Electronic Engineering) , With all the talk about the Information Highway and its construction, there is also a channel which is highly underestimated and thus almost ignored. On normal FM radio transmissions extra bandwidth exists, suitable for the transmission of audio and data. In this thesis the effects of interference on data transmission over the Supplementary Signal Transmission (SST) channel are analysed. The channel is characterized in terms of the Bit Error Rate (BER) versus field strength and distance from a transmitter ...
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'n Objek-georiënteerde benadering in die daarstelling van 'n uitsaainetwerk-beplanningsmodel vir die SAUK : seindistribusie
- Authors: Van Aswegen, Wouter
- Date: 2014-04-14
- Subjects: Telecommunication systems - Technological innovations , Signal theory (Telecommunication) , Broadcasting - South Africa
- Type: Thesis
- Identifier: uj:10625 , http://hdl.handle.net/10210/10146
- Description: M.Tech. (Computer Science) , The Signal Distribution department of the SABC does planning regarding the signal distribution or broadcasting network of the SABC. In order to do effective planning a tool had to be developed to assist in the planning of the broadcasting network. The Rand Afrikaans University was asked to supply a student to analyze the problems surrounding the development of such a tool and supply the SABC with a solution to the problems. The problems surrounding the development of a broadcast network planning model were the availability and accuracy of the information needed for planning. The data needed was spread throughout the country with only manual means to transport the data. The solution to the problem would be to develop a system to cope with the decentralized database and to gather the data in order to supply valuable planning information. To provide a framework for the solution of the planning problem, a broadcasting network was compared with a computer network. The comparison revealed a number of parallels between a broadcasting and a computer network. As a result of the resemblance between the two types of networks, a foundation for the development of a planning model for a broadcasting network could be identified. The ISO IS OSI approach was used as a foundation for the development of the model. The principles of the seven layers along with the three network management models The broadcasting network model was developed using the principles of the OSI approach, object orientation, geographical information systems and graphical user interfaces. A "package" was defined to assist in the logical data flow of the model. The package contains the specific data used in a calculation. A package containing information can be split or combined according to strict rules. The effective management of the package is a central issue in the development of the planning model. A prototype system was developed on PC-Arc/Info, a PC based GIS. The prototype's aim was to prove that the principles used in the model could be implemented successfully. As the developed system was intended to serve as a prototype, it did not implement the full functionality of the model, but only the functions necessary to prove the viability of the model.
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- Authors: Van Aswegen, Wouter
- Date: 2014-04-14
- Subjects: Telecommunication systems - Technological innovations , Signal theory (Telecommunication) , Broadcasting - South Africa
- Type: Thesis
- Identifier: uj:10625 , http://hdl.handle.net/10210/10146
- Description: M.Tech. (Computer Science) , The Signal Distribution department of the SABC does planning regarding the signal distribution or broadcasting network of the SABC. In order to do effective planning a tool had to be developed to assist in the planning of the broadcasting network. The Rand Afrikaans University was asked to supply a student to analyze the problems surrounding the development of such a tool and supply the SABC with a solution to the problems. The problems surrounding the development of a broadcast network planning model were the availability and accuracy of the information needed for planning. The data needed was spread throughout the country with only manual means to transport the data. The solution to the problem would be to develop a system to cope with the decentralized database and to gather the data in order to supply valuable planning information. To provide a framework for the solution of the planning problem, a broadcasting network was compared with a computer network. The comparison revealed a number of parallels between a broadcasting and a computer network. As a result of the resemblance between the two types of networks, a foundation for the development of a planning model for a broadcasting network could be identified. The ISO IS OSI approach was used as a foundation for the development of the model. The principles of the seven layers along with the three network management models The broadcasting network model was developed using the principles of the OSI approach, object orientation, geographical information systems and graphical user interfaces. A "package" was defined to assist in the logical data flow of the model. The package contains the specific data used in a calculation. A package containing information can be split or combined according to strict rules. The effective management of the package is a central issue in the development of the planning model. A prototype system was developed on PC-Arc/Info, a PC based GIS. The prototype's aim was to prove that the principles used in the model could be implemented successfully. As the developed system was intended to serve as a prototype, it did not implement the full functionality of the model, but only the functions necessary to prove the viability of the model.
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M-ary frequency mapping techniques for power-line communications
- Authors: Lukusa, Tedy Mpoyi
- Date: 2013-05-27
- Subjects: Signal theory (Telecommunication) , Frequency mapping , Signal processing - Digital techniques , Wireless communication systems
- Type: Thesis
- Identifier: uj:7536 , http://hdl.handle.net/10210/8394
- Description: 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.
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- Authors: Lukusa, Tedy Mpoyi
- Date: 2013-05-27
- Subjects: Signal theory (Telecommunication) , Frequency mapping , Signal processing - Digital techniques , Wireless communication systems
- Type: Thesis
- Identifier: uj:7536 , http://hdl.handle.net/10210/8394
- Description: 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.
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