The Experts below are selected from a list of 109251 Experts worldwide ranked by ideXlab platform
Klaus Moessner - One of the best experts on this subject based on the ideXlab platform.
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Distributed power control algorithm for cognitive radios with Primary Protection via spectrum sensing under user mobility
Ad Hoc Networks, 2012Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Substantial spectrum gains have been demonstrated with the introduction of cognitive radio however; such gains are usually short lived due to the increased level of interference to licensed users of the spectrum. The interference management problem is herein tackled from the transmitter power control perspective so that transmissions by cognitive radio network does not violate the interference threshold levels at the Primary users as well as maintain the QoS requirements of cognitive radio users. We model the cognitive radio network for mobile and immobile users and propose algorithms exploiting Primary radio environment knowledge (spectrum use), called power control with Primary Protection via spectrum sensing. The algorithm is briefly introduced for time invariant systems and demonstrated that it has the ability to satisfy tight QoS constraints for cognitive radios as well as meet the interference constraints for licensed users. We, however, further show that such assumption of terminal immobility in the power control algorithm would fail in cases where user mobility is considered, resulting in increased levels of interference to the Primary as well as increased outages in cognitive radio network. We model the link gain evolution process as a distance dependent shadow fading process and scale-up the target signal to interference ratio to cope with user mobility. Since mobility driven power control algorithms for cognitive radios have not been investigated before, we therefore, propose a mobility driven power control framework for cognitive radios based on spectrum sensing, which ensures that the interference limit at the Primary receiver is unperturbed at all times, while concurrently maintaining the QoS within the cognitive radio network as compared to static user cases. We also corroborate our algorithms with proof of convergence.
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distributed power control for cognitive radios with Primary Protection via spectrum sensing
Vehicular Technology Conference, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.
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VTC Fall - Distributed Power Control for Cognitive Radios with Primary Protection via Spectrum Sensing
2010 IEEE 72nd Vehicular Technology Conference - Fall, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.
Olasunkanmi Durowoju - One of the best experts on this subject based on the ideXlab platform.
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Distributed power control algorithm for cognitive radios with Primary Protection via spectrum sensing under user mobility
Ad Hoc Networks, 2012Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Substantial spectrum gains have been demonstrated with the introduction of cognitive radio however; such gains are usually short lived due to the increased level of interference to licensed users of the spectrum. The interference management problem is herein tackled from the transmitter power control perspective so that transmissions by cognitive radio network does not violate the interference threshold levels at the Primary users as well as maintain the QoS requirements of cognitive radio users. We model the cognitive radio network for mobile and immobile users and propose algorithms exploiting Primary radio environment knowledge (spectrum use), called power control with Primary Protection via spectrum sensing. The algorithm is briefly introduced for time invariant systems and demonstrated that it has the ability to satisfy tight QoS constraints for cognitive radios as well as meet the interference constraints for licensed users. We, however, further show that such assumption of terminal immobility in the power control algorithm would fail in cases where user mobility is considered, resulting in increased levels of interference to the Primary as well as increased outages in cognitive radio network. We model the link gain evolution process as a distance dependent shadow fading process and scale-up the target signal to interference ratio to cope with user mobility. Since mobility driven power control algorithms for cognitive radios have not been investigated before, we therefore, propose a mobility driven power control framework for cognitive radios based on spectrum sensing, which ensures that the interference limit at the Primary receiver is unperturbed at all times, while concurrently maintaining the QoS within the cognitive radio network as compared to static user cases. We also corroborate our algorithms with proof of convergence.
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distributed power control for cognitive radios with Primary Protection via spectrum sensing
Vehicular Technology Conference, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.
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VTC Fall - Distributed Power Control for Cognitive Radios with Primary Protection via Spectrum Sensing
2010 IEEE 72nd Vehicular Technology Conference - Fall, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.
M.m. Eissa - One of the best experts on this subject based on the ideXlab platform.
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resilient wide area monitoring and Protection scheme with ieee std c37 118 1 2011 criteria for complex smart grid system using phase diagram
IET Smart Grid, 2019Co-Authors: M.m. EissaAbstract:Challenges facing power system Protection in a wide-area system are latency and full coverage of a wide-area disturbance. The complexity of large-scale power system configurations has led to challenges in the design of coordination and operating systems for Protection relays. Local measurements used for Primary and backup Protection cannot consider wide system disturbances. A new wide-area-monitoring-system-based Primary Protection is presented for a complex power system involving double and single lines. It is based on describing the non-linear dynamic operation of the transmission lines during a fault in the form of a set of differential equations that are solved through paths movements in a phase diagram. The fault on the lines can be precisely recognised. The speed of the traditional communication media limits wide-area monitoring as backup Protection. This study presents the Primary Protection scheme for double and single circuits in a wide area for the first time based on fourth-generation technology with low latency. The justification for applying the proposed scheme as Primary Protection in a wide-area-monitoring system is discussed. The number of relays on the studied configuration is reduced from 18 local relays to only 5 phasor measurement units for protecting the lines in the area.
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Developing wide area phase plane Primary Protection scheme “WA4PS” for complex smart grid system
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: M.m. EissaAbstract:Abstract The paper presents a new wide area phase plane Primary Protection scheme “ WA 4 PS ” for interconnected electric bulk power system Protection. The main purpose is to get a decision based on data sharing instead of the traditional Primary stand alone relays. The principle of Protection depends on getting autonomous plane solution for the differential equations of the transmission line with constant coefficients. The differential equations that describe the transmission line contain complex eigen values and the paths of the phase plane should be ellipse. The phase paths of solving this autonomous plane system depend on the eigen values changes according to the different types of faults on the transmission line. The fault pattern of a particular solution in the phaseplane called the trajectory of the solution. The trajectory of the solution can easily identify the faulted line based on the equilibrium solution as tincreases . The new idea depends on data collected from different phasor measurement units “ PMUs ” deployed on a real interconnected 500 / 200 kV grid . The faults on the transmission line can be accurately identified in a time estimated by 5 msec and with a latency in the communication by 50 msec based on 4 G technology. This reason refers to consider the WA 4 PS as a Primary Protection.
Qiu Qin - One of the best experts on this subject based on the ideXlab platform.
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Secondary protective control for mitigation of Protection misoperations in electric power systems
Journal of Modern Power Systems and Clean Energy, 2016Co-Authors: N. Eva Wu, Qiu QinAbstract:This paper investigates the feasibility of a selective secondary protective control strategy proposed to maximize the likelihood of recovery from misoperations of the existing (Primary) Protection in a power system. A scalable stochastic discrete-state model is established, taking into consideration of the processes of Protection misoperations and their mitigations. Such misoperations have been a main culprit of cascading failures in modern power systems. The likelihood of recovery from Protection misoperations is quantified by a set of security indices that formally incorporate the uncertain knowledge of the continuous-state of rotor angles/speed deviations of synchronous generators and that of the discrete-state of equipment faults and Primary Protection misoperations. The proposed secondary Protection leverages on the ever more available time-synchronized samples of networked sensors for diagnosis and fault-tolerant control to cost effectively improving power system reliability without altering the existing Protection system. The technology readiness for implementing the secondary protective control is examined through a three-area test system.
Kamran Arshad - One of the best experts on this subject based on the ideXlab platform.
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Distributed power control algorithm for cognitive radios with Primary Protection via spectrum sensing under user mobility
Ad Hoc Networks, 2012Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Substantial spectrum gains have been demonstrated with the introduction of cognitive radio however; such gains are usually short lived due to the increased level of interference to licensed users of the spectrum. The interference management problem is herein tackled from the transmitter power control perspective so that transmissions by cognitive radio network does not violate the interference threshold levels at the Primary users as well as maintain the QoS requirements of cognitive radio users. We model the cognitive radio network for mobile and immobile users and propose algorithms exploiting Primary radio environment knowledge (spectrum use), called power control with Primary Protection via spectrum sensing. The algorithm is briefly introduced for time invariant systems and demonstrated that it has the ability to satisfy tight QoS constraints for cognitive radios as well as meet the interference constraints for licensed users. We, however, further show that such assumption of terminal immobility in the power control algorithm would fail in cases where user mobility is considered, resulting in increased levels of interference to the Primary as well as increased outages in cognitive radio network. We model the link gain evolution process as a distance dependent shadow fading process and scale-up the target signal to interference ratio to cope with user mobility. Since mobility driven power control algorithms for cognitive radios have not been investigated before, we therefore, propose a mobility driven power control framework for cognitive radios based on spectrum sensing, which ensures that the interference limit at the Primary receiver is unperturbed at all times, while concurrently maintaining the QoS within the cognitive radio network as compared to static user cases. We also corroborate our algorithms with proof of convergence.
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distributed power control for cognitive radios with Primary Protection via spectrum sensing
Vehicular Technology Conference, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.
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VTC Fall - Distributed Power Control for Cognitive Radios with Primary Protection via Spectrum Sensing
2010 IEEE 72nd Vehicular Technology Conference - Fall, 2010Co-Authors: Olasunkanmi Durowoju, Kamran Arshad, Klaus MoessnerAbstract:Cognitive radios have been proposed as a solution to the spectrum underutilisation problem and have been proven to increase spectrum efficiency whilst providing opportunities for futuristic technologies. However, increased levels of interference are expected with the introduction of secondary spectrum access, therefore, proper interference management within the cognitive framework is imperative. The interference management problem is herein tackled from the transmitter power control perspective so that transmission by cognitive radio network does not violate the interference level thresholds at the Primary receiver. We propose a fully distributed power control framework for cognitive radio network exploiting spectrum use and radio environment knowledge. The proposed algorithm called Distributed Power Control with Primary Protection via Spectrum Sensing has the ability to satisfy tight QoS constraints for cognitive radios as well as to meet interference constraints for Primary users.