2010 Third International Conference on Communication Theory, Reliability, and Quality of Service, 2010
ABSTRACT Convergence of fixed and mobile offers advantages for both consumers and service provide... more ABSTRACT Convergence of fixed and mobile offers advantages for both consumers and service providers and is gaining momentum in the marketplace as operators are realizing the market opportunities for creating new revenue-generating services. As communication services are evolving, users are increasingly faced with a confusion of devices, subscriptions and numbers. Consumers are growing to expect ubiquitous, constant connectivity and access to all manner of information applications. Service providers, large and small, must simultaneously find ways to offset the declines in traditional revenue sources while continuing to drive top-line growth. The race within the telecommunications industry to achieve convergence is likely the catalyst for Unlicensed Mobile Access (UMA) fast-track development. The UMA standard brings wireless cellular telephony and 802.11 wireless networking together for seamless voice, data and multimedia services using one dual-mode handset (DMH). This article addresses the future path of telecommunication networks to a fixed-mobile convergence environment that meets the requirements of both consumers and providers. The article will address elements of UMA including access, benefits and architecture, along with competitive and technological issues involved with this prominent concept to fixed mobile-convergence.
Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513)
An extended overview on the orthogonal frequency division multiple access (OFDMA) technique and i... more An extended overview on the orthogonal frequency division multiple access (OFDMA) technique and its applications in 4/sup th/ generation cellular mobile networks is presented. After introducing the main idea, a comparison between the performance of OFDMA and other multiple access systems is carried out. Moreover, some practical notes for system deployment are discussed. Finally, two standardized telecommunication systems that use OFDMA as air interface are introduced and their basic parameters are compared.
... Both variants use Privacy Key Management (PKM) for authentication between base station and ..... more ... Both variants use Privacy Key Management (PKM) for authentication between base station and ... categories range from the urban to the rural customers, while the categories ... Adaptive modulation and coding (AMC) ▪ HARQ ▪ Fast downlink scheduling ▪ Soft handoff is replaced by ...
2008 Canadian Conference on Electrical and Computer Engineering, 2008
AbstractThis paper presents an extended overview of the Worldwide Interoperability for Microwave... more AbstractThis paper presents an extended overview of the Worldwide Interoperability for Microwave Access (WiMAX) and its applications in higher generation wireless networks as a cost effective solution to address both fixed broadband services and broadband wireless access ...
The telecommunication industry has been through disruptive times, but data networking service rev... more The telecommunication industry has been through disruptive times, but data networking service revenue has continued to rise. The telecom industry is expected to continue to grow as demand increases for cable and high-speed Internet in previously unserviced locations and as local telephone companies upgrade their lines in response to increasing competition. This paper presents an extended overview of the Worldwide Interoperability for Microwave Access (WiMAX) and its applications in higher generation wireless networks as a cost effective solution to answering the challenges posed by the digital divide. It looks at the technology behind WiMAX and networks design and deployment factors that impact WiMAX coverage. A cell site coverage simulation at different frequency bands using Wireless simulation tool is presented. Also the paper makes a comparison of WiMAX with two enhanced third generation (3G) technologies that are potential competitors to WiMAX. It then goes on describe the business models in WiMAX and states some of the benefits and drawbacks of a mobile WiMAX network.
Integration of information and communication technologies with the traditional of electric power ... more Integration of information and communication technologies with the traditional of electric power infrastructures and creation of an interoperable, scalable, and flexible smart grid will require numerous technological innovations and advancements. The purpose of this paper is to take a detailed look at the various technologies which may be utilized in the data transmission for the smart grid and the problems or difficulties that must be overcome to effectively use them. A variety of wireless systems are analyzed and we discuss the security of these mediums as privacy remains a major obstacle for implementing smart grid technology.
Load research data is used to develop kwh-to-peak-kW conversion Wors, diversity factors, and aver... more Load research data is used to develop kwh-to-peak-kW conversion Wors, diversity factors, and average timevarying load data as a function of customer class, month, and type of day. A new method, Nonlinear Load Research based Estimation (NL,RE), is used to derive monthly load shapes by customer class for estimating the peak MW load on substations as a function of total MWh usage by customer class, type of day, and month. Four substations at Hot Springs, Arkansas are used for estimation of monthly peak and the results are compared with measured values from a SCADA system. The results show improved accuracy of the NLRE estimated substation peaks in comparison with the previous method.
an extended overview on the Orthogonal Frequency Division Multiple Access (OFDMA) technique and i... more an extended overview on the Orthogonal Frequency Division Multiple Access (OFDMA) technique and its applications in the 4 th generation cellular mobile networks is presented in this paper. After introducing the main idea, a comparison between the performance of OFDMA and other multiple access systems is carried out. Moreover, some practical notes for the system deployment are discussed. Finally, two standardized telecommunication systems-that use OFDMA as air interface-are introduced and their basic parameters are compared.
Integration of information and communication technologies with the traditional of electric power ... more Integration of information and communication technologies with the traditional of electric power infrastructures and creation of an interoperable, scalable, and flexible smart grid will require numerous technological innovations and advancements. The purpose of this paper is to take a detailed look at the various technologies which may be utilized in the data transmission for the smart grid and the problems or difficulties that must be overcome to effectively use them. A variety of wireless systems are analyzed and we discuss the security of these mediums as privacy remains a major obstacle for implementing smart grid technology.
Peripheral neurons of most sensory systems increase their response with increasing stimulus inten... more Peripheral neurons of most sensory systems increase their response with increasing stimulus intensity. Behavioural responses, however, can be specific to some intermediate intensity level whose particular value might be innate or associatively learned. Learning such a preference requires an adjustable trans- formation from a monotonic stimulus representation at the sensory periphery to a non-monotonic representation for the motor command. How do neural systems accomplish this task? We tackle this general question focusing on odour-intensity learning in the fruit fly, whose first- and second-order olfactory neurons show monotonic stimulus-response curves. Nevertheless, flies form associative memories specific to particular trained odour intensities. Thus, downstream of the first two olfactory processing layers, odour intensity must be re-coded to enable intensity-specific associative learning. We present a minimal, feed-forward, three-layer circuit, which implements the required tran...
Associative learning relies on event timing. Fruit flies for example, once trained with an odour ... more Associative learning relies on event timing. Fruit flies for example, once trained with an odour that precedes electric shock, subsequently avoid this odour (punishment learning); if, on the other hand the odour follows the shock during training, it is approached later on (relief learning). During training, an odour-induced Ca ++ signal and a shock-induced dopaminergic signal converge in the Kenyon cells, synergistically activating a Ca ++-calmodulin-sensitive adenylate cyclase, which likely leads to the synaptic plasticity underlying the conditioned avoidance of the odour. In Aplysia, the effect of serotonin on the corresponding adenylate cyclase is bi-directionally modulated by Ca ++ , depending on the relative timing of the two inputs. Using a computational approach, we quantitatively explore this biochemical property of the adenylate cyclase and show that it can generate the effect of event timing on associative learning. We overcome the shortage of behavioural data in Aplysia and biochemical data in Drosophila by combining findings from both systems.
ABSTRACT Today’s electrical grid is considered one of the greatest engineering accomplishments of... more ABSTRACT Today’s electrical grid is considered one of the greatest engineering accomplishments of all time. It was recognized in 2003 by the National Academy of Engineering as the preeminent engineering achievement of the twentieth century. Currently, the utility industry is facing a number of challenges that are bringing about the need to make major changes to the grid. These challenges include the need for greater energy security arising from increasing demand for energy worldwide and decreasing supply of fossil fuels to meet the demand, worldwide concern about global climate change, aging infrastructure and inefficiency in the existing grid. Additionally, consumers want to play a role in their own energy management and conservation. To address these challenges, the utility industry is in the early phases of migrating toward a “smart grid.” The goal of the smart grid is to make the existing grid more efficient and less harmful to the environment, while continuing to provide safe, reliable, and affordable electricity to consumers. This paper discusses the current issues in regard to energy consumption, problems with the existing grid and the goals of the smart grid , information and communication technology (ICT) infrastructure, and communication technologies, standards, and protocols that are either already in use or are being considered for the smart grid , micro-grids, plug-in hybrid electric vehicles (PHEVs) and smart homes and the role they will play in the smart grid, existing smart grid deployments and pilot projects , the economic issues related to the smart grid and focuses on sensors for smart grid networks, and green networks.
It is becoming clear that underwater sensor networks are needed to predict natural disasters, pro... more It is becoming clear that underwater sensor networks are needed to predict natural disasters, provide scientist research for marine life exploration, and to advance military capabilities. These underwater sensor networks pose great challenges to our existing technologies used in terrestrial sensor networks, mainly due to the acoustic waves used in water. These waves behave differently than the radio waves on land. The purposes of this research paper is to provide a better understanding of an underwater sensor network architecture, basic characteristic, applications, and examine the propagation limitations of acoustic communication. We also provide an overview of modulations and medium access controls.
2010 Third International Conference on Communication Theory, Reliability, and Quality of Service, 2010
ABSTRACT Convergence of fixed and mobile offers advantages for both consumers and service provide... more ABSTRACT Convergence of fixed and mobile offers advantages for both consumers and service providers and is gaining momentum in the marketplace as operators are realizing the market opportunities for creating new revenue-generating services. As communication services are evolving, users are increasingly faced with a confusion of devices, subscriptions and numbers. Consumers are growing to expect ubiquitous, constant connectivity and access to all manner of information applications. Service providers, large and small, must simultaneously find ways to offset the declines in traditional revenue sources while continuing to drive top-line growth. The race within the telecommunications industry to achieve convergence is likely the catalyst for Unlicensed Mobile Access (UMA) fast-track development. The UMA standard brings wireless cellular telephony and 802.11 wireless networking together for seamless voice, data and multimedia services using one dual-mode handset (DMH). This article addresses the future path of telecommunication networks to a fixed-mobile convergence environment that meets the requirements of both consumers and providers. The article will address elements of UMA including access, benefits and architecture, along with competitive and technological issues involved with this prominent concept to fixed mobile-convergence.
Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513)
An extended overview on the orthogonal frequency division multiple access (OFDMA) technique and i... more An extended overview on the orthogonal frequency division multiple access (OFDMA) technique and its applications in 4/sup th/ generation cellular mobile networks is presented. After introducing the main idea, a comparison between the performance of OFDMA and other multiple access systems is carried out. Moreover, some practical notes for system deployment are discussed. Finally, two standardized telecommunication systems that use OFDMA as air interface are introduced and their basic parameters are compared.
... Both variants use Privacy Key Management (PKM) for authentication between base station and ..... more ... Both variants use Privacy Key Management (PKM) for authentication between base station and ... categories range from the urban to the rural customers, while the categories ... Adaptive modulation and coding (AMC) ▪ HARQ ▪ Fast downlink scheduling ▪ Soft handoff is replaced by ...
2008 Canadian Conference on Electrical and Computer Engineering, 2008
AbstractThis paper presents an extended overview of the Worldwide Interoperability for Microwave... more AbstractThis paper presents an extended overview of the Worldwide Interoperability for Microwave Access (WiMAX) and its applications in higher generation wireless networks as a cost effective solution to address both fixed broadband services and broadband wireless access ...
The telecommunication industry has been through disruptive times, but data networking service rev... more The telecommunication industry has been through disruptive times, but data networking service revenue has continued to rise. The telecom industry is expected to continue to grow as demand increases for cable and high-speed Internet in previously unserviced locations and as local telephone companies upgrade their lines in response to increasing competition. This paper presents an extended overview of the Worldwide Interoperability for Microwave Access (WiMAX) and its applications in higher generation wireless networks as a cost effective solution to answering the challenges posed by the digital divide. It looks at the technology behind WiMAX and networks design and deployment factors that impact WiMAX coverage. A cell site coverage simulation at different frequency bands using Wireless simulation tool is presented. Also the paper makes a comparison of WiMAX with two enhanced third generation (3G) technologies that are potential competitors to WiMAX. It then goes on describe the business models in WiMAX and states some of the benefits and drawbacks of a mobile WiMAX network.
Integration of information and communication technologies with the traditional of electric power ... more Integration of information and communication technologies with the traditional of electric power infrastructures and creation of an interoperable, scalable, and flexible smart grid will require numerous technological innovations and advancements. The purpose of this paper is to take a detailed look at the various technologies which may be utilized in the data transmission for the smart grid and the problems or difficulties that must be overcome to effectively use them. A variety of wireless systems are analyzed and we discuss the security of these mediums as privacy remains a major obstacle for implementing smart grid technology.
Load research data is used to develop kwh-to-peak-kW conversion Wors, diversity factors, and aver... more Load research data is used to develop kwh-to-peak-kW conversion Wors, diversity factors, and average timevarying load data as a function of customer class, month, and type of day. A new method, Nonlinear Load Research based Estimation (NL,RE), is used to derive monthly load shapes by customer class for estimating the peak MW load on substations as a function of total MWh usage by customer class, type of day, and month. Four substations at Hot Springs, Arkansas are used for estimation of monthly peak and the results are compared with measured values from a SCADA system. The results show improved accuracy of the NLRE estimated substation peaks in comparison with the previous method.
an extended overview on the Orthogonal Frequency Division Multiple Access (OFDMA) technique and i... more an extended overview on the Orthogonal Frequency Division Multiple Access (OFDMA) technique and its applications in the 4 th generation cellular mobile networks is presented in this paper. After introducing the main idea, a comparison between the performance of OFDMA and other multiple access systems is carried out. Moreover, some practical notes for the system deployment are discussed. Finally, two standardized telecommunication systems-that use OFDMA as air interface-are introduced and their basic parameters are compared.
Integration of information and communication technologies with the traditional of electric power ... more Integration of information and communication technologies with the traditional of electric power infrastructures and creation of an interoperable, scalable, and flexible smart grid will require numerous technological innovations and advancements. The purpose of this paper is to take a detailed look at the various technologies which may be utilized in the data transmission for the smart grid and the problems or difficulties that must be overcome to effectively use them. A variety of wireless systems are analyzed and we discuss the security of these mediums as privacy remains a major obstacle for implementing smart grid technology.
Peripheral neurons of most sensory systems increase their response with increasing stimulus inten... more Peripheral neurons of most sensory systems increase their response with increasing stimulus intensity. Behavioural responses, however, can be specific to some intermediate intensity level whose particular value might be innate or associatively learned. Learning such a preference requires an adjustable trans- formation from a monotonic stimulus representation at the sensory periphery to a non-monotonic representation for the motor command. How do neural systems accomplish this task? We tackle this general question focusing on odour-intensity learning in the fruit fly, whose first- and second-order olfactory neurons show monotonic stimulus-response curves. Nevertheless, flies form associative memories specific to particular trained odour intensities. Thus, downstream of the first two olfactory processing layers, odour intensity must be re-coded to enable intensity-specific associative learning. We present a minimal, feed-forward, three-layer circuit, which implements the required tran...
Associative learning relies on event timing. Fruit flies for example, once trained with an odour ... more Associative learning relies on event timing. Fruit flies for example, once trained with an odour that precedes electric shock, subsequently avoid this odour (punishment learning); if, on the other hand the odour follows the shock during training, it is approached later on (relief learning). During training, an odour-induced Ca ++ signal and a shock-induced dopaminergic signal converge in the Kenyon cells, synergistically activating a Ca ++-calmodulin-sensitive adenylate cyclase, which likely leads to the synaptic plasticity underlying the conditioned avoidance of the odour. In Aplysia, the effect of serotonin on the corresponding adenylate cyclase is bi-directionally modulated by Ca ++ , depending on the relative timing of the two inputs. Using a computational approach, we quantitatively explore this biochemical property of the adenylate cyclase and show that it can generate the effect of event timing on associative learning. We overcome the shortage of behavioural data in Aplysia and biochemical data in Drosophila by combining findings from both systems.
ABSTRACT Today’s electrical grid is considered one of the greatest engineering accomplishments of... more ABSTRACT Today’s electrical grid is considered one of the greatest engineering accomplishments of all time. It was recognized in 2003 by the National Academy of Engineering as the preeminent engineering achievement of the twentieth century. Currently, the utility industry is facing a number of challenges that are bringing about the need to make major changes to the grid. These challenges include the need for greater energy security arising from increasing demand for energy worldwide and decreasing supply of fossil fuels to meet the demand, worldwide concern about global climate change, aging infrastructure and inefficiency in the existing grid. Additionally, consumers want to play a role in their own energy management and conservation. To address these challenges, the utility industry is in the early phases of migrating toward a “smart grid.” The goal of the smart grid is to make the existing grid more efficient and less harmful to the environment, while continuing to provide safe, reliable, and affordable electricity to consumers. This paper discusses the current issues in regard to energy consumption, problems with the existing grid and the goals of the smart grid , information and communication technology (ICT) infrastructure, and communication technologies, standards, and protocols that are either already in use or are being considered for the smart grid , micro-grids, plug-in hybrid electric vehicles (PHEVs) and smart homes and the role they will play in the smart grid, existing smart grid deployments and pilot projects , the economic issues related to the smart grid and focuses on sensors for smart grid networks, and green networks.
It is becoming clear that underwater sensor networks are needed to predict natural disasters, pro... more It is becoming clear that underwater sensor networks are needed to predict natural disasters, provide scientist research for marine life exploration, and to advance military capabilities. These underwater sensor networks pose great challenges to our existing technologies used in terrestrial sensor networks, mainly due to the acoustic waves used in water. These waves behave differently than the radio waves on land. The purposes of this research paper is to provide a better understanding of an underwater sensor network architecture, basic characteristic, applications, and examine the propagation limitations of acoustic communication. We also provide an overview of modulations and medium access controls.
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Papers by Abdulrahman Yarali