Combating impulsive noise and narrowband interference as a mixture in a power line communications channel
- Authors: Bolaji, Abiola
- Date: 2018
- Subjects: Electric lines - Carrier transmission , Modulation (Electronics) , Digital communications , Coding theory , Error-correcting codes (Information theory)
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/280109 , uj:30093
- Description: M.Ing. (Electrical Engineering) , Abstract: Please refer to full text to view abstract.
- Full Text:
- Authors: Bolaji, Abiola
- Date: 2018
- Subjects: Electric lines - Carrier transmission , Modulation (Electronics) , Digital communications , Coding theory , Error-correcting codes (Information theory)
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/280109 , uj:30093
- Description: M.Ing. (Electrical Engineering) , Abstract: Please refer to full text to view abstract.
- Full Text:
Improvement of indoor environment signal reception using PLC-RF diversity techniques
- Authors: Igboamalu, Frank Nonso
- Date: 2019
- Subjects: Broadband communication systems , Signal processing , Electric lines - Carrier transmission , Radio frequency , Skyscrapers , Apartment houses
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/424703 , uj:36331
- Description: D.Ing. (Electrical and Electronic Engineering) , Abstract: Please refer to full text to view abstract.
- Full Text:
- Authors: Igboamalu, Frank Nonso
- Date: 2019
- Subjects: Broadband communication systems , Signal processing , Electric lines - Carrier transmission , Radio frequency , Skyscrapers , Apartment houses
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/424703 , uj:36331
- Description: D.Ing. (Electrical and Electronic Engineering) , Abstract: Please refer to full text to view abstract.
- Full Text:
Performance of asymmetrically clipped optical OFDM and DC-biased optical OFDM based on fast Fourier transform/discrete Hartley transform for powerline communication-visible light communication systems under impulsive noise
- Authors: Mapfumo, Irvine
- Date: 2020
- Subjects: Electric lines - Carrier transmission , Signal processing - Digital techniques , Wireless communication systems , Computer networks
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/480256 , uj:43468
- Description: Abstract: Hybrid PLC-VLC systems have generated a lot of research attention lately due to high data speeds and low implementation costs they offer. Owing to the increased number of devices connected to the internet, there has been an abrupt rise of data congestion in the RF spectrum, hence there is need to relieve it to allow high speed data communication access. Research output has provided evidence that PLC and VLC technologies can be integrated successfully to provide an alternate and cost-effective solution to relieve the RF spectrum... , M.Ing. (Electrical and Electronic Engineering Science)
- Full Text:
- Authors: Mapfumo, Irvine
- Date: 2020
- Subjects: Electric lines - Carrier transmission , Signal processing - Digital techniques , Wireless communication systems , Computer networks
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/480256 , uj:43468
- Description: Abstract: Hybrid PLC-VLC systems have generated a lot of research attention lately due to high data speeds and low implementation costs they offer. Owing to the increased number of devices connected to the internet, there has been an abrupt rise of data congestion in the RF spectrum, hence there is need to relieve it to allow high speed data communication access. Research output has provided evidence that PLC and VLC technologies can be integrated successfully to provide an alternate and cost-effective solution to relieve the RF spectrum... , M.Ing. (Electrical and Electronic Engineering Science)
- Full Text:
Performance ranking and implementation of permutation coded orthogonal frequency division multiplexing for power-line communications
- Authors: Ogunyanda, Kehinde
- Date: 2017
- Subjects: Orthogonal frequency division multiplexing , Telecommunication lines , Electric lines - Carrier transmission , Coding theory
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/263056 , uj:27802
- Description: D.Phil. , Abstract: Please refer to full text to view abstract
- Full Text:
- Authors: Ogunyanda, Kehinde
- Date: 2017
- Subjects: Orthogonal frequency division multiplexing , Telecommunication lines , Electric lines - Carrier transmission , Coding theory
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/263056 , uj:27802
- Description: D.Phil. , Abstract: Please refer to full text to view abstract
- Full Text:
The effect of coupling circuits in power line communications on impulsive noise
- Authors: Samakande, Tendai
- Date: 2019
- Subjects: Electric lines - Carrier transmission , Directional couplers , Electronic circuits - Noise , Digital communications
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/394351 , uj:32655
- Description: Abstract : Most researchers in the Power Line Communications field have adopted the practice of using idealized impulse noise models (Middleton class A) directly at the input of the demodulator, as is widely done in simulations. The effect of the coupling circuit on the impulse noise tends to be ignored. However, coupling circuits produce transients. This work focuses on investigating the effect of the coupling circuit on the impulse noise. This was achieved through a series of measurements conducted using different coupling circuits. An experimental set-up was developed which separates the generated impulse noise and the measured impulse noise after the coupling circuit. It was observed that the coupling circuit produces transients which must not be ignored. The transients produced by the coupling circuit introduces ringing to the impulse noise signal affecting its time domain parameters which have the most adverse effects to data transmission on power lines. To further understand the effects of the coupling circuit, an equivalent circuit of the coupling circuit was developed and simulations were conducted. These confirmed the occurrence of resonance in the coupling circuit introducing ringing to the impulsive noise signal. i , M.Ing. (Electrical and Electronic Engineering)
- Full Text:
- Authors: Samakande, Tendai
- Date: 2019
- Subjects: Electric lines - Carrier transmission , Directional couplers , Electronic circuits - Noise , Digital communications
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/394351 , uj:32655
- Description: Abstract : Most researchers in the Power Line Communications field have adopted the practice of using idealized impulse noise models (Middleton class A) directly at the input of the demodulator, as is widely done in simulations. The effect of the coupling circuit on the impulse noise tends to be ignored. However, coupling circuits produce transients. This work focuses on investigating the effect of the coupling circuit on the impulse noise. This was achieved through a series of measurements conducted using different coupling circuits. An experimental set-up was developed which separates the generated impulse noise and the measured impulse noise after the coupling circuit. It was observed that the coupling circuit produces transients which must not be ignored. The transients produced by the coupling circuit introduces ringing to the impulse noise signal affecting its time domain parameters which have the most adverse effects to data transmission on power lines. To further understand the effects of the coupling circuit, an equivalent circuit of the coupling circuit was developed and simulations were conducted. These confirmed the occurrence of resonance in the coupling circuit introducing ringing to the impulsive noise signal. i , M.Ing. (Electrical and Electronic Engineering)
- Full Text:
Implementation issues for M-ARY FSK on narrowband power line communications
- Authors: Sanya, Timothy Oluwatobi
- Date: 2012-08-01
- Subjects: Digital communications , Telecommunication systems , Electric lines - Carrier transmission
- Type: Thesis
- Identifier: uj:8921 , http://hdl.handle.net/10210/5391
- Description: M.Phil. , The advantages offered by power line communications (hereon after called PLC) cannot be over-emphasized neither can the inherent problems affecting its commercial takeover be underestimated. This research work creates a background study for experimental measurement and eventual implementations on power lines. It explains those salient aspects of commercially available communication modules that are rather not straight forward to understand from reading the Comblocks user manual. Especially, addressing those shortcomings of Comblocks that were not indicated in the documentation, we o er solutions to those we could nd our way around. M-ary frequency shift keying was implemented. This implementation tested the ro- bustness of the scheme against noises, attenuation and other power line channel char- acteristics as encountered practically. Based on our results, we nally recommend an optimal set of frequencies; we believe to be good for use in most PLC application pur- poses. Pseudo random bits of information were generated, encoded and modulated; the signals were transmitted over power line channels. The impact of noise sources, impulse noise especially was observed at di erent distances along the channel. Coupling and decoupling circuits used for this research, with associated issues sur- rounding the use of coupling circuitry are also presented. The CENELEC norm for PLC communication was adhered to, hence only frequencies that fall within the CENELEC speci cation for low voltage power distribution network were considered for MFSK use. Signal-to-noise ratio and other factors that a ect signal transmission over PLC was also measured. A complete communication system comprises of the transmitter, the channel and the receiver. This work however did not cover the receiver part of the system. Future work can now be done on this aspect which amongst others can take care of synchronization issues, in which a coding system as well as bit error rates can be determined.
- Full Text:
- Authors: Sanya, Timothy Oluwatobi
- Date: 2012-08-01
- Subjects: Digital communications , Telecommunication systems , Electric lines - Carrier transmission
- Type: Thesis
- Identifier: uj:8921 , http://hdl.handle.net/10210/5391
- Description: M.Phil. , The advantages offered by power line communications (hereon after called PLC) cannot be over-emphasized neither can the inherent problems affecting its commercial takeover be underestimated. This research work creates a background study for experimental measurement and eventual implementations on power lines. It explains those salient aspects of commercially available communication modules that are rather not straight forward to understand from reading the Comblocks user manual. Especially, addressing those shortcomings of Comblocks that were not indicated in the documentation, we o er solutions to those we could nd our way around. M-ary frequency shift keying was implemented. This implementation tested the ro- bustness of the scheme against noises, attenuation and other power line channel char- acteristics as encountered practically. Based on our results, we nally recommend an optimal set of frequencies; we believe to be good for use in most PLC application pur- poses. Pseudo random bits of information were generated, encoded and modulated; the signals were transmitted over power line channels. The impact of noise sources, impulse noise especially was observed at di erent distances along the channel. Coupling and decoupling circuits used for this research, with associated issues sur- rounding the use of coupling circuitry are also presented. The CENELEC norm for PLC communication was adhered to, hence only frequencies that fall within the CENELEC speci cation for low voltage power distribution network were considered for MFSK use. Signal-to-noise ratio and other factors that a ect signal transmission over PLC was also measured. A complete communication system comprises of the transmitter, the channel and the receiver. This work however did not cover the receiver part of the system. Future work can now be done on this aspect which amongst others can take care of synchronization issues, in which a coding system as well as bit error rates can be determined.
- Full Text:
Modelling of power cables for use in estimation of power line communication channel frequency response
- Authors: Sheri, Ashraf
- Date: 2018
- Subjects: Telecommunication lines , Electric lines - Carrier transmission , Telecommunication systems
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/492886 , uj:45033
- Description: Abstract: This study falls within the ambit of power line communication (PLC). PLC is a fundamental element to achieve direct communication on a power line cable. The evolution of PLC applications in the connectivity between electrical and electronic equipment is important for the future of the Internet of things (IoT) and smart grid where wireless communication is impossible. From a kettle to a power meter to a TV, each unit will form a node on a network. PLC aims at utilising electrical power cables to establish communication between these nodes. In such a system, PLC has the advantage of simultaneously supplying power as well as an electronic communication channel. If power and communication are supplied separately, greater complexity and cost may follow. This is especially true if the projection of billions of nodes for future networks becomes a reality. This thesis proposes a model for describing feasible communication and electrical power simultaneously with respect to equipment and energy. The same equipment intended for power supply can be used for communication. A power line cable can also be used for signal transmission, thereby reducing energy consumption. A significant factor relevant to PLC is the determination of the performance of the channel which includes the channel frequency response (CFR). The CFR has an important function in the specification of the power line cable for communications purposes, since it is the output that is obtained from the power line cable over the input as a function of frequency. Low voltage indoor power line cables are investigated and its suitability for communications in terms of an approximate CFR is determined. The investigation utilises Shannon’s theorems to categorise the power cable as narrowband with carrier frequencies from 3 kHz to 500 kHz or broadband with carrier frequencies from 2 MHz to 70 MHz, depending on the bandwidth (CFR). Cable parameters such as resistance, inductance, conductance, capacitance, length and termination are investigated up to 100 MHz. This study shows cable length and load impedance to be the primary factors affecting CFR behaviour. Long cables (several hundred metres in length) and low load impedances - lower than the cable characteristic impedance (few Ω) - can dramatically limit the bandwidth of the CFR. Variances in the geometry, dielectric and resistance of the power line cable are only secondary effects and do not affect CFR as drastically as length and load impedance of the power line cable... , D.Ing. (Electronic and Electronic Engineering Science)
- Full Text:
- Authors: Sheri, Ashraf
- Date: 2018
- Subjects: Telecommunication lines , Electric lines - Carrier transmission , Telecommunication systems
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/492886 , uj:45033
- Description: Abstract: This study falls within the ambit of power line communication (PLC). PLC is a fundamental element to achieve direct communication on a power line cable. The evolution of PLC applications in the connectivity between electrical and electronic equipment is important for the future of the Internet of things (IoT) and smart grid where wireless communication is impossible. From a kettle to a power meter to a TV, each unit will form a node on a network. PLC aims at utilising electrical power cables to establish communication between these nodes. In such a system, PLC has the advantage of simultaneously supplying power as well as an electronic communication channel. If power and communication are supplied separately, greater complexity and cost may follow. This is especially true if the projection of billions of nodes for future networks becomes a reality. This thesis proposes a model for describing feasible communication and electrical power simultaneously with respect to equipment and energy. The same equipment intended for power supply can be used for communication. A power line cable can also be used for signal transmission, thereby reducing energy consumption. A significant factor relevant to PLC is the determination of the performance of the channel which includes the channel frequency response (CFR). The CFR has an important function in the specification of the power line cable for communications purposes, since it is the output that is obtained from the power line cable over the input as a function of frequency. Low voltage indoor power line cables are investigated and its suitability for communications in terms of an approximate CFR is determined. The investigation utilises Shannon’s theorems to categorise the power cable as narrowband with carrier frequencies from 3 kHz to 500 kHz or broadband with carrier frequencies from 2 MHz to 70 MHz, depending on the bandwidth (CFR). Cable parameters such as resistance, inductance, conductance, capacitance, length and termination are investigated up to 100 MHz. This study shows cable length and load impedance to be the primary factors affecting CFR behaviour. Long cables (several hundred metres in length) and low load impedances - lower than the cable characteristic impedance (few Ω) - can dramatically limit the bandwidth of the CFR. Variances in the geometry, dielectric and resistance of the power line cable are only secondary effects and do not affect CFR as drastically as length and load impedance of the power line cable... , D.Ing. (Electronic and Electronic Engineering Science)
- Full Text:
Markov modelling and bit error rate analysis of in-vehicle power line communication
- Authors: Wilson, Mark David
- Date: 2014-09-23
- Subjects: Electric lines - Carrier transmission , Automobiles - Dynamics , Propulsion systems
- Type: Thesis
- Identifier: uj:12375 , http://hdl.handle.net/10210/12159
- Description: M.Ing. (Electrical And Electronic Engineering) , In-vehicle Power Line Communication (PLC) is an emerging technology that can easily bene t the automotive industry by reducing the amount of wires (and hence cost, weight and complexity) for vehicle wire harnesses. The reduction in weight would also lead to less fuel consumption. This dissertation aims at taking the research of this technology a step towards fully understanding the vehicle's power line as a communication medium. We investigate the bit error characteristics of a readily available transceiver on the vehicle's power bus. To do so, we develop and perform bit error recording over the medium to get experimental results with the battery line under di ferent operating conditions. Using the rst set of these results, we parametrise di erent kinds of Markov models to see which one simulates the channel best. Using the preferred model, we then model the rest of the sets of results so that we can simulate the channel's bit error characteristics under these di erent conditions. Using these models, we demonstrate how these simulations can be used to evaluate the performance of di erent error detection and correction techniques. In particular, we evaluate the error detection mechanisms used in the popular in-vehicle Local Intercon- nect Network (LIN) protocol, in addition to some simple error correction techniques.
- Full Text:
- Authors: Wilson, Mark David
- Date: 2014-09-23
- Subjects: Electric lines - Carrier transmission , Automobiles - Dynamics , Propulsion systems
- Type: Thesis
- Identifier: uj:12375 , http://hdl.handle.net/10210/12159
- Description: M.Ing. (Electrical And Electronic Engineering) , In-vehicle Power Line Communication (PLC) is an emerging technology that can easily bene t the automotive industry by reducing the amount of wires (and hence cost, weight and complexity) for vehicle wire harnesses. The reduction in weight would also lead to less fuel consumption. This dissertation aims at taking the research of this technology a step towards fully understanding the vehicle's power line as a communication medium. We investigate the bit error characteristics of a readily available transceiver on the vehicle's power bus. To do so, we develop and perform bit error recording over the medium to get experimental results with the battery line under di ferent operating conditions. Using the rst set of these results, we parametrise di erent kinds of Markov models to see which one simulates the channel best. Using the preferred model, we then model the rest of the sets of results so that we can simulate the channel's bit error characteristics under these di erent conditions. Using these models, we demonstrate how these simulations can be used to evaluate the performance of di erent error detection and correction techniques. In particular, we evaluate the error detection mechanisms used in the popular in-vehicle Local Intercon- nect Network (LIN) protocol, in addition to some simple error correction techniques.
- Full Text:
- «
- ‹
- 1
- ›
- »