International Journal of Interdisciplinary Telecommunications and Networking, 2013
Fading is the most observed and frustrating problem in transmitting and receiving radio signals. ... more Fading is the most observed and frustrating problem in transmitting and receiving radio signals. A Study in correlation properties of fading helps to design proper communication systems that are robust to it. In this work, received power signal was obtained by drive-test technique. The analysis was determined using distribution fitting tool in Matlab software 7.5.0 (R2007b). The following fading distributions were used, Rayleigh, Rician, Nakagami-m, Lognormal and Weibull. Weibull fading distribution was found to give the best description of fading experienced in Ghana.On the other hand, Rician distribution, Nakagami-m distribution and lognormal distribution have less agreement with the measured data while Rayleigh fading distribution has much less agreement with measured data. The obtained mean scale parameter and the mean shape parameter in the Weibull distribution for the environment considered were 133.76 and 15.93, respectively. Furthermore, the path loss exponents in the near a...
Electrical distribution networks are prone to power quality disturbances originating from the com... more Electrical distribution networks are prone to power quality disturbances originating from the complexity of the distribution network, mode of distribution (overhead or underground) and types of loads used by customers. Data on the types of disturbances present and frequency of occurrence is needed for economic evaluation and hence finding solution to the problem. Utility companies have resorted to using secondary power quality devices such as smart meters to help gather the required data. Even though this approach is easier to adopt, data gathered from these devices may not serve the required purpose, since the installation of these devices in the electrical network usually does not conform to available PQM placement methods. This paper presents a design of a PQM that is capable of integrating into an existing DAS infrastructure to take advantage of available placement methodologies. The monitoring component of the design is implemented and installed to monitor an existing LV networ...
A lot of attention has been drawn to ensuring a secure communication in an ad hoc network environ... more A lot of attention has been drawn to ensuring a secure communication in an ad hoc network environment. It is important to anonymously send and receive sensitive data from secure sources. Digital signature is one of the powerful ways of ensuring integrity, privacy, confidentiality and nonrepudiation in terms of signing messages. A technique from RSA is employed to propose a new digital signature to be used in wireless networks. This concept also ensures both source and location anonymity. Adversaries will find it difficult to identify the source of a message and exactly where the message is being sent to. With regard to a zone, it will not be possible to identify who sends a message and also who receives it within the group in the zone. It is believed that the signature is light weight and can easily be generated by any of the nodes in the zone. In the context of using the scheme without wireless network, individual uses alternative steps for signing sensitive documents by classifyin...
Proceedings of the Future Technologies Conference (FTC) 2018, 2018
Television White Spaces (TVWS) are unused and unassigned channels called Vacant Channels (VCs) in... more Television White Spaces (TVWS) are unused and unassigned channels called Vacant Channels (VCs) in the licensed broadband wireless spectrum allocated to TV broadcasters also called Primary Users (PUs). One of the major objectives for implementing TVWS technology in delivering broadband internet is to ensure the efficient utilization of VCs in wireless spectrum. To this end, the Geolocation Database (GLDB) has been widely accepted by regulators as the main technique for detecting VCs for use by unlicensed Secondary Users (SUs), because it offers better prospects in preventing harmful interference to licensed PUs. However, in the open literature, little attention has been given to its capacity to ensure that VCs assigned to SUs for data transmissions are fully utilized. There is the tendency for SUs to misuse VCs assigned to them, by staying idle for long periods without transmitting since there are no proper monitoring mechanisms. This denies other SUs the opportunity to access same c...
Abstract Large numbers of test stimuli impact on test application time and cost of test applicati... more Abstract Large numbers of test stimuli impact on test application time and cost of test application. Hence there is the need to keep numbers of test stimuli low while maintaining as high fault coverage as possible. In this paper, static compaction of test stimuli is seen as a ...
Test application time is a major factor of the cost associated with the scan technique. On one ex... more Test application time is a major factor of the cost associated with the scan technique. On one extreme test application time can be drastically reduced by using built-in self-test (BIST). However, the quality of random test pattern used by BIST is low. On the other extreme, automated test equipment based testing using quality automatic test pattern generation is very time-consuming. Research in the area of economics of test application is directed towards finding a good blend of the two extremes to arrive at a workable optimal hybrid. A novel method for achieving this hybrid is presented in this paper. The approach used consists of a modification of the scan architecture and the development of a matching algorithm. The modified scan architecture involves the addition of a multiple-input signature register (MISR) to the scan chain. This way test responses are not captured in the scan chain but, rather, are compressed in the MISR. The proposed algorithm then takes advantage of repeate...
2012 IEEE 4th International Conference on Adaptive Science & Technology (ICAST), 2012
ABSTRACT One of the main challenges of Securing effective computation in network devices tends to... more ABSTRACT One of the main challenges of Securing effective computation in network devices tends to be a limitation of their computation power. They all tend to have a feature in common: limited computational capabilities and equally limited power (as most operate on batteries). Server assisted signature (SAS) scheme was recently presented as non-repudiation service for mobile and constrained devices. The scheme however made use of traditional protocols such as those based on RSA. Such protocols are computationally intensive and time consuming. In this paper we propose a scheme that is based on a modification of the RSA algorithm, ne modified algorithm has less complexity than the traditional RSA. Additionally, the proposed scheme shares the computational load between the mobile device and a server we call security mediator (SEM). Thus the mobile device effectively plays a part in the generation of public key signatures. The scheme has been evaluated against the standard RSA-based scheme and we present a result that shows that the proposed scheme leads to much faster operation.
International Journal of Interdisciplinary Telecommunications and Networking, 2013
Fading is the most observed and frustrating problem in transmitting and receiving radio signals. ... more Fading is the most observed and frustrating problem in transmitting and receiving radio signals. A Study in correlation properties of fading helps to design proper communication systems that are robust to it. In this work, received power signal was obtained by drive-test technique. The analysis was determined using distribution fitting tool in Matlab software 7.5.0 (R2007b). The following fading distributions were used, Rayleigh, Rician, Nakagami-m, Lognormal and Weibull. Weibull fading distribution was found to give the best description of fading experienced in Ghana.On the other hand, Rician distribution, Nakagami-m distribution and lognormal distribution have less agreement with the measured data while Rayleigh fading distribution has much less agreement with measured data. The obtained mean scale parameter and the mean shape parameter in the Weibull distribution for the environment considered were 133.76 and 15.93, respectively. Furthermore, the path loss exponents in the near a...
Electrical distribution networks are prone to power quality disturbances originating from the com... more Electrical distribution networks are prone to power quality disturbances originating from the complexity of the distribution network, mode of distribution (overhead or underground) and types of loads used by customers. Data on the types of disturbances present and frequency of occurrence is needed for economic evaluation and hence finding solution to the problem. Utility companies have resorted to using secondary power quality devices such as smart meters to help gather the required data. Even though this approach is easier to adopt, data gathered from these devices may not serve the required purpose, since the installation of these devices in the electrical network usually does not conform to available PQM placement methods. This paper presents a design of a PQM that is capable of integrating into an existing DAS infrastructure to take advantage of available placement methodologies. The monitoring component of the design is implemented and installed to monitor an existing LV networ...
A lot of attention has been drawn to ensuring a secure communication in an ad hoc network environ... more A lot of attention has been drawn to ensuring a secure communication in an ad hoc network environment. It is important to anonymously send and receive sensitive data from secure sources. Digital signature is one of the powerful ways of ensuring integrity, privacy, confidentiality and nonrepudiation in terms of signing messages. A technique from RSA is employed to propose a new digital signature to be used in wireless networks. This concept also ensures both source and location anonymity. Adversaries will find it difficult to identify the source of a message and exactly where the message is being sent to. With regard to a zone, it will not be possible to identify who sends a message and also who receives it within the group in the zone. It is believed that the signature is light weight and can easily be generated by any of the nodes in the zone. In the context of using the scheme without wireless network, individual uses alternative steps for signing sensitive documents by classifyin...
Proceedings of the Future Technologies Conference (FTC) 2018, 2018
Television White Spaces (TVWS) are unused and unassigned channels called Vacant Channels (VCs) in... more Television White Spaces (TVWS) are unused and unassigned channels called Vacant Channels (VCs) in the licensed broadband wireless spectrum allocated to TV broadcasters also called Primary Users (PUs). One of the major objectives for implementing TVWS technology in delivering broadband internet is to ensure the efficient utilization of VCs in wireless spectrum. To this end, the Geolocation Database (GLDB) has been widely accepted by regulators as the main technique for detecting VCs for use by unlicensed Secondary Users (SUs), because it offers better prospects in preventing harmful interference to licensed PUs. However, in the open literature, little attention has been given to its capacity to ensure that VCs assigned to SUs for data transmissions are fully utilized. There is the tendency for SUs to misuse VCs assigned to them, by staying idle for long periods without transmitting since there are no proper monitoring mechanisms. This denies other SUs the opportunity to access same c...
Abstract Large numbers of test stimuli impact on test application time and cost of test applicati... more Abstract Large numbers of test stimuli impact on test application time and cost of test application. Hence there is the need to keep numbers of test stimuli low while maintaining as high fault coverage as possible. In this paper, static compaction of test stimuli is seen as a ...
Test application time is a major factor of the cost associated with the scan technique. On one ex... more Test application time is a major factor of the cost associated with the scan technique. On one extreme test application time can be drastically reduced by using built-in self-test (BIST). However, the quality of random test pattern used by BIST is low. On the other extreme, automated test equipment based testing using quality automatic test pattern generation is very time-consuming. Research in the area of economics of test application is directed towards finding a good blend of the two extremes to arrive at a workable optimal hybrid. A novel method for achieving this hybrid is presented in this paper. The approach used consists of a modification of the scan architecture and the development of a matching algorithm. The modified scan architecture involves the addition of a multiple-input signature register (MISR) to the scan chain. This way test responses are not captured in the scan chain but, rather, are compressed in the MISR. The proposed algorithm then takes advantage of repeate...
2012 IEEE 4th International Conference on Adaptive Science & Technology (ICAST), 2012
ABSTRACT One of the main challenges of Securing effective computation in network devices tends to... more ABSTRACT One of the main challenges of Securing effective computation in network devices tends to be a limitation of their computation power. They all tend to have a feature in common: limited computational capabilities and equally limited power (as most operate on batteries). Server assisted signature (SAS) scheme was recently presented as non-repudiation service for mobile and constrained devices. The scheme however made use of traditional protocols such as those based on RSA. Such protocols are computationally intensive and time consuming. In this paper we propose a scheme that is based on a modification of the RSA algorithm, ne modified algorithm has less complexity than the traditional RSA. Additionally, the proposed scheme shares the computational load between the mobile device and a server we call security mediator (SEM). Thus the mobile device effectively plays a part in the generation of public key signatures. The scheme has been evaluated against the standard RSA-based scheme and we present a result that shows that the proposed scheme leads to much faster operation.
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