Evaluation of mixed permutation codes in PLC channels, using hamming distance profile
- Ogunyanda, Kehinde, Familua, Ayokunle D., Swart, Theo G., Ferreira, Hendrik C., Cheng, Ling
- Authors: Ogunyanda, Kehinde , Familua, Ayokunle D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, Ling
- Date: 2017
- Subjects: Channel coding , Digital modulation , G3-PLC
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/385833 , http://hdl.handle.net/10210/225993 , uj:22839 , Citation: Ogunyanda, K. et al. 2017. Evaluation of mixed permutation codes in PLC channels, using hamming distance profile.
- Description: Abstract: We report a new concept involving an adaptive mixture of different sets of permutation codes (PC) in a single DPSK-OFDM modulation scheme. Since this scheme is robust and the algorithms involved are simple, it is a good candidate for implementation for OFDM-based power line communication (PLC) systems. By using a special and easy concept called Hamming distance profile, as a comparison tool, we are able to showcase the strength of the new PC scheme over other schemes reported in literature, in handling the incessant noise types associated with PLC channels. This prediction tool is also useful for selecting an efficient PC codebook out of a number of ! similar ones.
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- Authors: Ogunyanda, Kehinde , Familua, Ayokunle D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, Ling
- Date: 2017
- Subjects: Channel coding , Digital modulation , G3-PLC
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/385833 , http://hdl.handle.net/10210/225993 , uj:22839 , Citation: Ogunyanda, K. et al. 2017. Evaluation of mixed permutation codes in PLC channels, using hamming distance profile.
- Description: Abstract: We report a new concept involving an adaptive mixture of different sets of permutation codes (PC) in a single DPSK-OFDM modulation scheme. Since this scheme is robust and the algorithms involved are simple, it is a good candidate for implementation for OFDM-based power line communication (PLC) systems. By using a special and easy concept called Hamming distance profile, as a comparison tool, we are able to showcase the strength of the new PC scheme over other schemes reported in literature, in handling the incessant noise types associated with PLC channels. This prediction tool is also useful for selecting an efficient PC codebook out of a number of ! similar ones.
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Evaluation and implementation of cyclic permutation coding for power line communications
- Ogunyanda, K., Familua, A. D., Swart, Theo G., Ferreira, Hendrik C., Cheng, L., Shongwe, T.
- Authors: Ogunyanda, K. , Familua, A. D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, L. , Shongwe, T.
- Date: 2015
- Subjects: Channel coding , Permutation coding , Power line communications
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/85285 , uj:19324 , Citation: Ogunyanda, K. et al. 2015. Evaluation and implementation of cyclic permutation coding for power line communications.
- Description: Abstract: Noise and attenuation, in the form of frequency disturbance, impulsive noise, additive white Gaussian noise (AWGN) and frequency selective fading, are the major setbacks in power line communications (PLC). In order to effectively combat this challenge, we thus report the development and implementation of a specially coded M-ary differential phase shift keying modulation scheme on narrowband PLC channel. The coding aspect involves the concatenation of conventional Reed Solomon (RS) code with cyclic permutation coding (CPC), resulting in what is termed RS-CPC scheme. The CPC employed in this work maps the output bits of a binary RS code onto non-binary CPC symbols, in a cyclic manner, with a view to improving the distance between two different sets of mapped symbols. For implementation over 230 V AC power line, software defined radio hardware, called the universal software radio peripherals (USRPs), were used, together with narrowband coupling circuits, to couple the signal to and receive it from the power line. Both by simulation and implementation, our scheme outperforms the conventional Reed Solomon-convolutional coding (RS-CC) specified in the G3-PLC standard. An added advantage is that our scheme is easier to implement.
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- Authors: Ogunyanda, K. , Familua, A. D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, L. , Shongwe, T.
- Date: 2015
- Subjects: Channel coding , Permutation coding , Power line communications
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/85285 , uj:19324 , Citation: Ogunyanda, K. et al. 2015. Evaluation and implementation of cyclic permutation coding for power line communications.
- Description: Abstract: Noise and attenuation, in the form of frequency disturbance, impulsive noise, additive white Gaussian noise (AWGN) and frequency selective fading, are the major setbacks in power line communications (PLC). In order to effectively combat this challenge, we thus report the development and implementation of a specially coded M-ary differential phase shift keying modulation scheme on narrowband PLC channel. The coding aspect involves the concatenation of conventional Reed Solomon (RS) code with cyclic permutation coding (CPC), resulting in what is termed RS-CPC scheme. The CPC employed in this work maps the output bits of a binary RS code onto non-binary CPC symbols, in a cyclic manner, with a view to improving the distance between two different sets of mapped symbols. For implementation over 230 V AC power line, software defined radio hardware, called the universal software radio peripherals (USRPs), were used, together with narrowband coupling circuits, to couple the signal to and receive it from the power line. Both by simulation and implementation, our scheme outperforms the conventional Reed Solomon-convolutional coding (RS-CC) specified in the G3-PLC standard. An added advantage is that our scheme is easier to implement.
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Simulation results for permutation trellis codes using M-ary FSK
- Swart, Theo G., De Beer, I., Ferreira, Hendrik C., Han Vinck, A. J.
- Authors: Swart, Theo G. , De Beer, I. , Ferreira, Hendrik C. , Han Vinck, A. J.
- Date: 2005
- Subjects: Channel coding , Convolutional codes , Interference suppression
- Language: English
- Type: Conference proceedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/368327 , http://hdl.handle.net/10210/18512 , uj:16008 , Citation: Swart, T.G. et al. 2005. Simulation results for permutation trellis codes using M-ary FSK. Proceedings of the IEEE International Symposium on Power Line Communications and its Applications, 6-8 April, 2005, Vancouver, Canada.
- Description: Abstract: It has previously been shown that using the combination of permutation codes and M-ary frequency shift keying has special properties and error correcting capabilities that are suitable for the noise types encountered in power line communications. Furthermore, the permutation codes are used to map onto the outputs of a binary convolutional code to form permutation trellis codes. We investigate and compare the performance of different permutation trellis codes when used with M-FSK for power line communications.
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- Authors: Swart, Theo G. , De Beer, I. , Ferreira, Hendrik C. , Han Vinck, A. J.
- Date: 2005
- Subjects: Channel coding , Convolutional codes , Interference suppression
- Language: English
- Type: Conference proceedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/368327 , http://hdl.handle.net/10210/18512 , uj:16008 , Citation: Swart, T.G. et al. 2005. Simulation results for permutation trellis codes using M-ary FSK. Proceedings of the IEEE International Symposium on Power Line Communications and its Applications, 6-8 April, 2005, Vancouver, Canada.
- Description: Abstract: It has previously been shown that using the combination of permutation codes and M-ary frequency shift keying has special properties and error correcting capabilities that are suitable for the noise types encountered in power line communications. Furthermore, the permutation codes are used to map onto the outputs of a binary convolutional code to form permutation trellis codes. We investigate and compare the performance of different permutation trellis codes when used with M-FSK for power line communications.
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Adaptive permutation coded differential OFDM system for power line communications
- Ogunyanda, K., Familua, A. D., Swart, Theo G., Ferreira, Hendrik C., Cheng, L.
- Authors: Ogunyanda, K. , Familua, A. D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, L.
- Date: 2015
- Subjects: Channel coding , G3-PLC , OFDM Modulation
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/85798 , uj:19389 , Citation: Ogunyanda, K. et al. 2015. Adaptive permutation coded differential OFDM system for power line communications.
- Description: Abstract: With a view to improving the capacity of the differential OFDM modulation scheme, specified in the narrowband power line communications (PLC) standards, in combating PLC channel associated noise, we hereby propose a permutation coded modulation scheme, which employs the hybridization of two kinds of DPSK (differential phase shift keying) modulations in an adaptive manner. The algorithm for deducing the encoded information from the hybridized modulations is described as well. This scheme is simulated and its performance is compared with a recently reported differential quinary PSK-OFDM system in the literature, whose behaviour has been shown to be better than the conventional permutation coded D8PSK-OFDM scheme at lower signal power to noise spectral density. Due to the simplicity in its encoding and decoding algorithms, this scheme is a good candidate for a number of low speed telemetry signaling in smart grids.
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- Authors: Ogunyanda, K. , Familua, A. D. , Swart, Theo G. , Ferreira, Hendrik C. , Cheng, L.
- Date: 2015
- Subjects: Channel coding , G3-PLC , OFDM Modulation
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/85798 , uj:19389 , Citation: Ogunyanda, K. et al. 2015. Adaptive permutation coded differential OFDM system for power line communications.
- Description: Abstract: With a view to improving the capacity of the differential OFDM modulation scheme, specified in the narrowband power line communications (PLC) standards, in combating PLC channel associated noise, we hereby propose a permutation coded modulation scheme, which employs the hybridization of two kinds of DPSK (differential phase shift keying) modulations in an adaptive manner. The algorithm for deducing the encoded information from the hybridized modulations is described as well. This scheme is simulated and its performance is compared with a recently reported differential quinary PSK-OFDM system in the literature, whose behaviour has been shown to be better than the conventional permutation coded D8PSK-OFDM scheme at lower signal power to noise spectral density. Due to the simplicity in its encoding and decoding algorithms, this scheme is a good candidate for a number of low speed telemetry signaling in smart grids.
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A ranking method for rating the performances of permutation codes
- Ogunyanda, K., Swart, Theo G.
- Authors: Ogunyanda, K. , Swart, Theo G.
- Date: 2017
- Subjects: Channel coding , Hamming distance distribution , Permutation coding
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/225986 , uj:22838 , Citation: Ogunyanda, K. & Swart, Theo G. 2017. A ranking method for rating the performances of permutation codes.
- Description: Abstract: Minimum Hamming distance, dm, has been widely used as the yardstick for the performance of permutation codes (PCs). However, a number of PCs with the same dm and cardinality can have different performances, even if they have the same distance optimality. Since PC is a robust channel coding scheme in power line communications applications, we present a simple and fast ranking method that predicts the relative performance of PCs, by using the information extracted from their Hamming distance distributions. This tool is useful for selecting an efficient PC codebook out of a number of similar ones.
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- Authors: Ogunyanda, K. , Swart, Theo G.
- Date: 2017
- Subjects: Channel coding , Hamming distance distribution , Permutation coding
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/225986 , uj:22838 , Citation: Ogunyanda, K. & Swart, Theo G. 2017. A ranking method for rating the performances of permutation codes.
- Description: Abstract: Minimum Hamming distance, dm, has been widely used as the yardstick for the performance of permutation codes (PCs). However, a number of PCs with the same dm and cardinality can have different performances, even if they have the same distance optimality. Since PC is a robust channel coding scheme in power line communications applications, we present a simple and fast ranking method that predicts the relative performance of PCs, by using the information extracted from their Hamming distance distributions. This tool is useful for selecting an efficient PC codebook out of a number of similar ones.
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Convolutional code search for optimum permutation trellis codes using M-ary FSK
- Swart, Theo G., Han Vinck, A. J., Ferreira, Hendrik C.
- Authors: Swart, Theo G. , Han Vinck, A. J. , Ferreira, Hendrik C.
- Date: 2007
- Subjects: Channel coding , Permutation codes , Frequency-shift keying , Interference suppression
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18537 , uj:16011 , Citation: Swart, T.G., Vinck, A.J.H. & Ferreira, H.C. 2007. Convolutional code search for optimum permutation trellis codes using M-ary FSK. Proceedings of the IEEE International Symposium on Power Line Communications and its Applications, 26-28 March, 2007.
- Description: Abstract: Permutation trellis codes combined with M-ary FSK are considered with the aim of combating additive noise, impulse noise and permanent frequency disturbances. New permutation trellis codes are presented that were found by exhaustive computer search, considering the free distance and the distance spectrum of the codes. Until now the best binary convolutional codes were considered to be the best candidates to use in mappings for trellis codes, however the results will show that this is not always the case. Simulation results are also presented, showing that in most cases the new permutation trellis codes are performing better than the previous codes, although the gains attained are small.
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- Authors: Swart, Theo G. , Han Vinck, A. J. , Ferreira, Hendrik C.
- Date: 2007
- Subjects: Channel coding , Permutation codes , Frequency-shift keying , Interference suppression
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18537 , uj:16011 , Citation: Swart, T.G., Vinck, A.J.H. & Ferreira, H.C. 2007. Convolutional code search for optimum permutation trellis codes using M-ary FSK. Proceedings of the IEEE International Symposium on Power Line Communications and its Applications, 26-28 March, 2007.
- Description: Abstract: Permutation trellis codes combined with M-ary FSK are considered with the aim of combating additive noise, impulse noise and permanent frequency disturbances. New permutation trellis codes are presented that were found by exhaustive computer search, considering the free distance and the distance spectrum of the codes. Until now the best binary convolutional codes were considered to be the best candidates to use in mappings for trellis codes, however the results will show that this is not always the case. Simulation results are also presented, showing that in most cases the new permutation trellis codes are performing better than the previous codes, although the gains attained are small.
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