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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Mohammed Affan Zidan Jurgen Kosel Khaled N. Salama Electrical Engineering Program King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

In this paper, we present an electrostatic MEMS switch with liquids as dielectric to reduce the actuation voltage. The concept is verified by simulating a lateral dual gate switch, where the required pull-in voltage is reduced by more than 8 times after using water as a dielectric, to become as low as 5.36V. The proposed switch is simulated using COMSOL multiphysics using various liquid volumes to study their effect on the switching performance. Finally, we propose the usage of the lateral switch as a single switch XOR logic gate.

关键词： Logic gates Microswitches Dielectric liquids Dielectrics Liquids Capacitance

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Transfer-less flexible and transparent high-к/metal gate Germanium devices on bulk silicon (100)

Transfer-less flexible and transparent high-к/metal gate Ge...

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IEEE Conference on Nanotechnology

作者： Joanna M. Nassar Aftab M. Hussain Jhonathan P. Rojas Muhammad M. Hussain Electrical Engineering Program King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

Flexible wearable electronics have been of great interest lately for the development of innovative future technology for various interactive applications in the field of consumer electronics and advanced healthcare, offering the promise of low-cost, lightweight, and multifunctionality. In the pursuit of this trend, high mobility channel materials need to be investigated on a flexible platform, for the development of flexible high performance devices. Germanium (Ge) is one of the most attractive alternatives for silicon (Si) for high-speed computational applications, due its higher hole and electron mobility. Thus, in this work we show a cost effective CMOS compatible process for transforming conventional rigid Ge metal oxide semiconductor capacitors (MOSCAPS) into a mechanically flexible and semi-transparent platform. Devices exhibit outstanding bendability with a bending radius of 0.24 cm, and semi-transparency up to 30 %, varying with respect to the diameter size of the release holes array.

关键词： Silicon Germanium Films Substrates Logic gates

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A Coalition Formation Game for Transmitter Cooperation in OFDMA Uplink Communications

A Coalition Formation Game for Transmitter Cooperation in OF...

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IEEE Global Communications Conference

作者： Ali Chelli Hamidou Tembine Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479935130

The SC-FDMA (single-carrier frequency division multiple access) is the access scheme that has been adopted by 3GPP (3rd generation partnership project) for the LTE (long term evolution) uplink. The SC-FDMA is an attractive alternative to OFDMA (orthogonal frequency-division multiple access) especially on the uplink owing to its low peak-to-average power ratio. This fact increases the power efficiency and reduces the cost of the power amplifiers at the mobile terminals. The use of SC-FDMA on the uplink implies that for highly loaded cells the base station allocates a single subcarrier to each user. This results in the limitation of the achievable rate on the uplink. In this work, we propose a coalition game between mobile terminals that allows them to improve their performance by sharing their subcarriers without creating any interference to each other. The proposed scheme allows a fair use of the subcarriers and leads to a significant capacity gain for each user. The cooperation between the nodes is modelled using coalitional game theory. In this game, each coalition tries to maximize its utility in terms of rate. In the absence of cooperation cost, it can be shown that the grand coalition is sum-rate optimal and stable, i.e., the mobile terminals have no incentive to leave the grand coalition.

关键词： Games Mobile communication Uplink Transmitters Approximation methods Signal to noise ratio Wireless communication

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Decode and Zero-forcing Forward Relaying with Relay Selection in Cognitive Radio Systems

Decode and Zero-forcing Forward Relaying with Relay Selectio...

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IEEE Vehicular technology Conference

作者： Ki-Hong Park Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479944811

In this paper, we investigate a cognitive radio (CR) relay network with multiple relay nodes that help forwarding the signal of CR users. Best relay selection is considered to take advantage of its low complexity of implementation. When the primary user (PU) is located close to the relay nodes, the performance of the secondary network is severely degraded due to the interference power constraint during the transmission in the second hop. We propose a decode and zero-forcing forward scheme to suppress the interference power at the relay nodes and analyze the statistics of the end-to-end signal-to-noise ratio when the relay nodes are located arbitrarily and experience therefore non-identical Rayleigh fading channels. Numerical results validate our theoretical results and show that our proposed scheme improves the performance of the CR network when the PU is close to the relay nodes.

关键词： Rayleigh channels cognitive radio decode and forward communication interference suppression relay networks (telecommunication) cognitive radio relay network decode and zero-forcing forward scheme end-to-end signal-to-noise ratio interference power constraint interference power suppression nonidentical Rayleigh fading channels primary user relay selection Cognitive radio Fading Gain Interference Relay networks (telecommunications) Signal to noise ratio Cognitive radio signal to noise ratios interference power Raleigh fading channels Trunk Node DECODING relay suppression of interference fading color Gain Radio systems Ganglia

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electrical thermal networks for direct contact membrane distillation modeling

Electrical thermal networks for direct contact membrane dist...

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IEEE Conference on Control technology and Applications (CCTA)

作者： Ayman M. Karam Taous Meriem Laleg-Kirati Computer Electrical and Mathematical Science and Engineering division King Abdullah University of Science and Technology (KAUST) KSA

ISBN: (纸本)9781479974108

Membrane distillation (MD) is a thermally driven process where only water vapor is passed through a hydrophobic membrane. Several models have been proposed to study this process, yet most of them assume steady-state conditions. This work presents a new approach to model Direct Contact Membrane Distillation (DCMD) dynamics based on the analogy between electrical and thermal systems. A lumped-capacitance dynamical model accounting for mass, energy, and momentum balance was derived and simulated in Simulink. First, the model was validated by considering three measures: the temperature distribution along the flow direction, the effect of feed linear velocity on the output temperatures, and total mass flux. The simulation results were compared with experimental data reported in the literature and showed very close match to the experimental measurements.

关键词： Feeds Heat transfer Mathematical model Resistance heating Water heating Impedance Thermal analysis

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Threshold based Detection for Amplify-and-Forward Cooperative Communication Systems with Channel Estimation Error

Threshold based Detection for Amplify-and-Forward Cooperativ...

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IEEE Vehicular technology Conference

作者： Abdulrahman Abuzaid Qasim Zeeshan Ahmed Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479944484

Efficient receiver designs for cooperative communication systems are becoming increasingly important. In previous work, cooperative networks communicated with the use of L relays. As the receiver is constrained, it can only process U out of L relays. Channel shortening and reduced-rank techniques were employed to design the preprocessing matrix. In this paper, a receiver structure is proposed which combines the joint iterative optimization (JIO) algorithm and our proposed threshold selection criteria. This receiver structure assists in determining the optimal U_(opt). Furthermore, this receiver provides the freedom to choose U ≤ U_(opt) for each frame depending upon the tolerable difference allowed for mean square error (MSE). Our study and simulation results show that by choosing an appropriate threshold, it is possible to gain in terms of complexity savings without affecting the BER performance of the system. Furthermore, in this paper the effect of channel estimation errors is investigated on the MSE performance of the amplify-and-forward (AF) cooperative relaying system.

关键词： Cooperative communications Reduced-rank Joint iterative optimization Adaptive filtering

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Design strategy for a tunable antenna on a partially magnetized ferrite LTCC substrate

Design strategy for a tunable antenna on a partially magneti...

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Antennas and Propagation Society International Symposium

作者： Farhan A. Ghaffar Atif Shamim Joey R. Bray Electrical Engineering Program King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Electrical and Computer Engineering Royal Military College Kingston Canada

Typical microwave simulators cannot accurately predict the behavior of an antenna on a partially magnetized substrate as they assume the substrate to be in fully saturate state. In this work, a new simulation strategy aided by theoretical analysis, is presented to model a tunable patch antenna on a partially magnetized ferrite substrate through a combination of magnetostatic and microwave simulators. An antenna prototype is fabricated in Ferrite LTCC medium to verify the partially magnetized state simulations. The measured results are in close agreement with the simulations, contrary to the case where the substrate is assumed to be in saturation. The prototype designed for 13 GHz exhibits a tuning range of 10 % making it highly suitable for tunable and reconfigurable wireless applications.

关键词： Saturation magnetization Magnetostatics Substrates Ferrites Magnetic multilayers Microwave antennas Antenna measurements

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Guest editors' foreword

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International Journal of Computational Geometry and Applications 2014年第4期24卷 259-260页

作者： Ahn, Hee-Kap Vigneron, Antoine Department of Computer Science and Engineering Pohang University of Science and Technology (POSTECH) 77 Cheongam-Ro Nam-Gu Pohang Gyeongbuk South Korea Visual Computing Center King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

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Performance Analysis of Switching based Hybrid FSO/RF Transmission

Performance Analysis of Switching based Hybrid FSO/RF Transm...

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IEEE Vehicular technology Conference

作者： Muneer Usman Hong-Chuan Yang Mohamed-Slim Alouini Dept. of Electrical and Computer Engineering University of Victoria Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479944484

Hybrid free space optical (FSO)/radio frequency (RF) systems have emerged as a promising solution for high data rate wireless back haul. We present and analyze a switching based transmission scheme for hybrid FSO/RF system. Specifically, either FSO or RF link will be active at a certain time instance, with FSO link enjoying a higher priority. Analytical expressions have been obtained for the outage probability, average bit error rate and ergodic capacity for the resulting system. Numerical examples are presented to compare the performance of the hybrid scheme with FSO only scenario.

关键词： Hybrid FSO/RF Free-space optical communication Log-normal fading Radio frequency Performance analysis

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Service Time Analysis of Secondary Packet Transmission with Opportunistic Channel Access

Service Time Analysis of Secondary Packet Transmission with ...

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IEEE Vehicular technology Conference

ISBN: (纸本)9781479944484

Cognitive radio transceiver can opportunistically access the underutilized channels of primary systems for new wireless services. The secondary transmission may be interrupted by the primary user's transmission. To facilitate the delay analysis of such secondary packet transmission, we study the resulting extended delivery time for a fixed-size secondary packet that includes both transmission time and waiting time. In particular we derive the exact distribution functions of extended delivery time of secondary transmission for both continuous sensing and periodic sensing cases. Selected numerical results are presented for illustrating the mathematical formulation.

关键词： Cognitive radio Spectrum access Channel sensing Distribution function Markov models

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