Low-complexity SOCPBFSK-OOK interface between PLC and VLC channels for low data rate transmission applications
- Ndjiongue, A. R., Ferreira, Hendrik C., Ouahada, K., Han Vinck, A. J.
- Authors: Ndjiongue, A. R. , Ferreira, Hendrik C. , Ouahada, K. , Han Vinck, A. J.
- Date: 2014
- Subjects: Frequency shift keying , Power line communications , Visible light communications
- Type: Book
- Identifier: uj:4747 , http://hdl.handle.net/10210/11733
- Description: This paper studies and proposes a low cost low complexity interface between power line communications (PLC) and visible light communications (VLC) for low data rate transmission applications. The discussion presents the performance of a spread orthogonal continuous phase binary frequency shift keying (SOCPBFSK) receiver combined with an on-off keying (OOK) modulator to relay low data transmission between PLC and VLC channels. The characteristics of the interface are presented. The results of an experimental test using the proposed interface over the European Committee for Electrotechnical Standardization (CENELEC) bands C and D are presented. The eye diagrams of the combined error are presented as well.
- Full Text:
- Authors: Ndjiongue, A. R. , Ferreira, Hendrik C. , Ouahada, K. , Han Vinck, A. J.
- Date: 2014
- Subjects: Frequency shift keying , Power line communications , Visible light communications
- Type: Book
- Identifier: uj:4747 , http://hdl.handle.net/10210/11733
- Description: This paper studies and proposes a low cost low complexity interface between power line communications (PLC) and visible light communications (VLC) for low data rate transmission applications. The discussion presents the performance of a spread orthogonal continuous phase binary frequency shift keying (SOCPBFSK) receiver combined with an on-off keying (OOK) modulator to relay low data transmission between PLC and VLC channels. The characteristics of the interface are presented. The results of an experimental test using the proposed interface over the European Committee for Electrotechnical Standardization (CENELEC) bands C and D are presented. The eye diagrams of the combined error are presented as well.
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Good synchronization sequences for permutation codes
- Ferreira, Hendrik C., Van Trung, Tran, Shongwe, T., Swart, Theo G.
- Authors: Ferreira, Hendrik C. , Van Trung, Tran , Shongwe, T. , Swart, Theo G.
- Date: 2012
- Subjects: Frequency shift keying , Frequency synchronization , Noise measurement , Synchronization
- Type: Article
- Identifier: uj:4737 , ISSN 0090-6778 , http://hdl.handle.net/10210/11723
- Description: For communication schemes employing Frequency Hopping/Multiple Frequency Shift Keying modulation, we present an algorithm for finding good non-binary synchronization sequences, which are permutations, to be used with permutation codes to synchronize/resynchronize data in channels with background noise and interference(frequency jamming/fading). For the synchronization sequences, new analytical expressions for the probability of false acquisition are also given. Using simulation results, we show that our synchronization sequences perform better than some conventional non-binary synchronization sequences, in the presence of background noise and interference.
- Full Text:
- Authors: Ferreira, Hendrik C. , Van Trung, Tran , Shongwe, T. , Swart, Theo G.
- Date: 2012
- Subjects: Frequency shift keying , Frequency synchronization , Noise measurement , Synchronization
- Type: Article
- Identifier: uj:4737 , ISSN 0090-6778 , http://hdl.handle.net/10210/11723
- Description: For communication schemes employing Frequency Hopping/Multiple Frequency Shift Keying modulation, we present an algorithm for finding good non-binary synchronization sequences, which are permutations, to be used with permutation codes to synchronize/resynchronize data in channels with background noise and interference(frequency jamming/fading). For the synchronization sequences, new analytical expressions for the probability of false acquisition are also given. Using simulation results, we show that our synchronization sequences perform better than some conventional non-binary synchronization sequences, in the presence of background noise and interference.
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Nonbinary convolutional codes and modified M-FSK detectors for power-line communications channel
- Authors: Ouahada, Khmaies
- Date: 2014
- Subjects: Convolutional codes , Detectors , Frequency shift keying , Noise measurement , Power transmission lines , Viterbi algorithm , Viterbi decoders
- Type: Article
- Identifier: uj:4791 , ISSN 1229-2370 , http://hdl.handle.net/10210/12043
- Description: The Viterbi decoding algorithm, which provides maximum - likelihood decoding, is currently considered the most widely used technique for the decoding of codes having a state description, including the class of linear error-correcting convolutional codes. Two classes of nonbinary convolutional codes are presented. Distance preserving mapping convolutional codes and M-ary convolutional codes are designed, respectively, from the distancepreserving mappings technique and the implementation of the conventional convolutional codes in Galois fields of order higher than two. We also investigated the performance of these codes when combined with a multiple frequency-shift keying (M-FSK) modulation scheme to correct narrowband interference (NBI) in powerline communications channel. Themodification of certain detectors of the M-FSK demodulator to refine the selection and the detection at the decoder is also presented. M-FSK detectors used in our simulations are discussed, and their chosen values are justified. Interesting and promising obtained results have shown a very strong link between the designed codes and the selected detector for MFSK modulation. An important improvement in gain for certain values of the modified detectors was also observed. The paper also shows that the newly designed codes outperform the conventional convolutional codes in a NBI environment.
- Full Text:
- Authors: Ouahada, Khmaies
- Date: 2014
- Subjects: Convolutional codes , Detectors , Frequency shift keying , Noise measurement , Power transmission lines , Viterbi algorithm , Viterbi decoders
- Type: Article
- Identifier: uj:4791 , ISSN 1229-2370 , http://hdl.handle.net/10210/12043
- Description: The Viterbi decoding algorithm, which provides maximum - likelihood decoding, is currently considered the most widely used technique for the decoding of codes having a state description, including the class of linear error-correcting convolutional codes. Two classes of nonbinary convolutional codes are presented. Distance preserving mapping convolutional codes and M-ary convolutional codes are designed, respectively, from the distancepreserving mappings technique and the implementation of the conventional convolutional codes in Galois fields of order higher than two. We also investigated the performance of these codes when combined with a multiple frequency-shift keying (M-FSK) modulation scheme to correct narrowband interference (NBI) in powerline communications channel. Themodification of certain detectors of the M-FSK demodulator to refine the selection and the detection at the decoder is also presented. M-FSK detectors used in our simulations are discussed, and their chosen values are justified. Interesting and promising obtained results have shown a very strong link between the designed codes and the selected detector for MFSK modulation. An important improvement in gain for certain values of the modified detectors was also observed. The paper also shows that the newly designed codes outperform the conventional convolutional codes in a NBI environment.
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Monitoring the performance of photovoltaic system DC-DC converter
- Authors: Ali, Ahmed
- Date: 2019
- Subjects: Photovoltaic effects , DC‐DC power converters , Frequency shift keying
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/403645 , uj:33833 , Citation: Ali, A. 2019. Monitoring the performance of photovoltaic system DC-DC converter.
- Description: Abstract: This paper presents a mathematical form for a stand-alone photovoltaic (PV) system that was implemented and tested at three different temperatures (15°C, 20°C and 30°C). Proteus software was used to test the PV system under the different temperatures. This system consists of an array of solar cells, which are the source of the voltage and current, these values will be transmitted to PC in order to show the received values of currents and voltages. The system has been tested under three cases; no sun and load off, sun and all load on and finally sun and load on (Vin=Vout) (Iin=Iout). In three cases studied, the system was able to effectively transmit the voltage and current by using frequency shift keying (FSK). Some negligible losses occurred apparently due to the load effect. This work was undertaken in order to study the influence of temperature as a means of optimizing, the performance of PV systems by determining the highest stand-alone PV maximum power point tracking (MPPT). Implementation results and the generated voltage show that the system achieves the highest MPPT when exposed to a 30°C temperature, while an exposure of 15°C resulted in the lowest MPPT.
- Full Text:
- Authors: Ali, Ahmed
- Date: 2019
- Subjects: Photovoltaic effects , DC‐DC power converters , Frequency shift keying
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/403645 , uj:33833 , Citation: Ali, A. 2019. Monitoring the performance of photovoltaic system DC-DC converter.
- Description: Abstract: This paper presents a mathematical form for a stand-alone photovoltaic (PV) system that was implemented and tested at three different temperatures (15°C, 20°C and 30°C). Proteus software was used to test the PV system under the different temperatures. This system consists of an array of solar cells, which are the source of the voltage and current, these values will be transmitted to PC in order to show the received values of currents and voltages. The system has been tested under three cases; no sun and load off, sun and all load on and finally sun and load on (Vin=Vout) (Iin=Iout). In three cases studied, the system was able to effectively transmit the voltage and current by using frequency shift keying (FSK). Some negligible losses occurred apparently due to the load effect. This work was undertaken in order to study the influence of temperature as a means of optimizing, the performance of PV systems by determining the highest stand-alone PV maximum power point tracking (MPPT). Implementation results and the generated voltage show that the system achieves the highest MPPT when exposed to a 30°C temperature, while an exposure of 15°C resulted in the lowest MPPT.
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