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Efficient stochastic EMC/EMI analysis using HDMR-generated surrogate models

Efficient stochastic EMC/EMI analysis using HDMR-generated s...

引用

2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011

作者： Yücel, Abdulkadir C. Baǧci, Hakan Michielssen, Eric Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 United States Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia

ISBN: (纸本)9781424451173

Stochastic methods have been used extensively to quantify effects due to uncertainty in system parameters (e.g. material, geometrical, and electrical constants) and/or excitation on observables pertinent to electromagnetic compatibility and interference (EMC/EMI) analysis (e.g. voltages across mission-critical circuit elements) [1]. In recent years, stochastic collocation (SC) methods, especially those leveraging generalized polynomial chaos (gPC) expansions, have received significant attention [2, 3]. SC-gPC methods probe surrogate models (i.e. compact polynomial input-output representations) to statistically characterize observables. They are nonintrusive, that is they use existing deterministic simulators, and often cost only a fraction of direct Monte-Carlo (MC) methods. Unfortunately, SC-gPC-generated surrogate models often lack accuracy (i) when the number of uncertain/random system variables is large and/or (ii) when the observables exhibit rapid variations. © 2011 IEEE.

关键词： Monte Carlo methods

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Advanced Wheeler cap method for measuring the antenna efficiency

Advanced Wheeler cap method for measuring the antenna effici...

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International Symposium on Antennas and Propagation

作者： Chihyun Cho Hosung Choo No-Weon Kang Jin-Seob Kang Communication R&D Center Samsung Thales 188 Gumi-dong Bundang-gu Seongnam-si 463-870 Korea School of Electronic and Electrical Engineering Hongik University 72-1 Sangsu-dong Mapo-gu Seoul 121-791 Korea Division of Physical Metrology Korea Research Institute of Standards and Science 267 Gajeong-ro Yuseong-gu Daejeon 305-340 Korea

ISBN: (纸本)9781467310017

In 1959, Wheeler published the theory of the radiansphere, which is the boundary between the far and near field with a distance of λ/2π from an antenna. The inside field of the radiansphere is mainly involved in the loss power and stored energy, while the outside field is concerned with the radiation power. Wheeler's theory is that the radiation power can be removed from the antenna without disturbing the loss power and stored energy when it is shielded by placing the conducting shell on the radiansphere [1]. The conventional Wheeler cap method predicts radiation efficiency by comparing the input resistances (or conductances) in free-space and in the cap [2]. This involves the assumption that the antenna under test (AUT) operates as a simple RLC circuit at the operating frequency. However, efficiency cannot be measured accurately by simply comparing input resistance (or conductances) when the AUT has a more complicated operating principle. To solve this problem, we applied the cascade parallel circuit [3] to the Wheeler cap method. This approach is superior to the conventional Wheeler cap, but it can be only applied to a microstrip patch with a probe feeding structure.

关键词： power loss antenna efficiency Hats Capricornus CAPS Cap ANTENNA antennae input resistance RLC CIRCUITS radiation efficiency energy storage Stored energy Conductance

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Development of a passive and remote magnetic microsensor with thin-film giant magnetoimpedance element and surface acoustic wave transponder

Development of a passive and remote magnetic microsensor wit...

引用

作者： Al Rowais, H. Li, B. Liang, C. Green, S. Gianchandani, Y. Kosel, J. Physical Sciences and Engineering Division King Abdullah University of Science and Technology 4700 KAUST Thuwal 23955 Saudi Arabia Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 United States

This paper presents the development of a wireless magnetic field sensor consisting of a three-layer thin-film giant magnetoimpedance sensor and a surface acoustic wave device on one substrate. The goal of this integration is a passive and remotely interrogated sensor that can be easily mass fabricated using standard microfabrication tools. The design parameters, fabrication process, and a model of the integrated sensor are presented together with experimental results of the sensor. © 2011 American Institute of Physics.

关键词： Thin films

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On the Finite-SNR Diversity-Multiplexing Tradeoff of Zero-Forcing Transmit Scheme under Secrecy Constraint

On the Finite-SNR Diversity-Multiplexing Tradeoff of Zero-Fo...

引用

IEEE International Conference on Communications Workshops, ICC

作者： Zouheir Rezki Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering (PSE) Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

In this paper, we address the finite Signal-to-Noise Ratio (SNR) Diversity-Multiplexing Tradeoff (DMT) of the Multiple Input Multiple Output (MIMO) wiretap channel, where a Zero-Forcing (ZF) transmit scheme, that intends to send the secret information in the orthogonal space of the eavesdropper channel, is used. First, we introduce the secret multiplexing gain at finite-SNR that generalizes the definition at high-SNR. Then, we provide upper and lower bounds on the outage probability under secrecy constraint, from which secret diversity gain estimates of ZF are derived. Through asymptotic analysis, we show that the upper bound underestimates the secret diversity gain, whereas the lower bound is tight with respect to secure DMT at high-SNR.

关键词： Diversity methods Signal to noise ratio Multiplexing Upper bound MIMO Gain Helium

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On the Average Capacity and Bit Error Probability of Wireless Communication Systems

On the Average Capacity and Bit Error Probability of Wireles...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Ferkan Yilmaz Mohamed-Slim Alouini Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

Analysis of the average binary error probabilities and average capacity of wireless communications systems over generalized fading channels have been considered separately in the past. This paper introduces a novel moment generating function-based unified expression for both average binary error probabilities and average capacity of single and multiple link communication with maximal ratio combining. It is a matter to note that the generic unified expression offered in this paper can be easily calculated and that is applicable to a wide variety of fading scenarios, and the mathematical formalism is illustrated with the generalized Gamma fading distribution in order to validate the correctness of our newly derived results.

关键词： Fading Signal to noise ratio Error probability Wireless communication Receivers Capacity planning Modulation

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Partial relay selection based on shadowing side information over generalized composite fading channels

Partial relay selection based on shadowing side information ...

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International Symposium on Wireless Communication Systems (ISWCS)

In this paper, in contrast to the relay selection protocols available in the literature, we propose a partial relay selection protocol utilizing only the shadowing side information of the relays instead of their full channel side information in order to select a relay in a dual-hop relaying system through the available limited feedback channels and power budget. We then presented an exact unified performance expression combining the average bit error probability, ergodic capacity, and moments-generating function of the proposed partial relay selection over generalized fading channels. Referring to the unified performance expression introduced in [1], we explicitly offer a generic unified performance expression that can be easily calculated and that is applicable to a wide variety of fading scenarios. Finally, as an illustration of the mathematical formalism, some numerical and simulation results are generated for an extended generalized-K fading environment, and these numerical and simulation results are shown to be in perfect agreement.

关键词： Relays Fading Shadow mapping Wireless communication Signal to noise ratio Protocols Error probability

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Novel relations between the ergodic capacity and the average bit error rate

Novel relations between the ergodic capacity and the average...

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International Symposium on Wireless Communication Systems (ISWCS)

Ergodic capacity and average bit error rate have been widely used to compare the performance of different wireless communication systems. As such recent scientific research and studies revealed strong impact of designing and implementing wireless technologies based on these two performance indicators. However and to the best of our knowledge, the direct links between these two performance indicators have not been explicitly proposed in the literature so far. In this paper, we propose novel relations between the ergodic capacity and the average bit error rate of an overall communication system using binary modulation schemes for signaling with a limited bandwidth and operating over generalized fading channels. More specifically, we show that these two performance measures can be represented in terms of each other, without the need to know the exact end-to-end statistical characterization of the communication channel. We validate the correctness and accuracy of our newly proposed relations and illustrated their usefulness by considering some classical examples.

关键词： Bit error rate Fading Modulation Signal to noise ratio Communication systems Bandwidth Channel capacity

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Outage Probability of Dual-Hop Partial Relay Selection with Feedback Delay in the Presence of Interference

Outage Probability of Dual-Hop Partial Relay Selection with ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Fawaz S. Al-Qahtani Redha M. Radaydeh Hussein Alnuweiri Electrical & Computer Engineering Program Texas A&M University at Qatar Division of Physical Science and Engineering King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781457713460

In this paper, we investigate the outage performance of a dual-hop relaying systems with partial relay selection and feedback delay. The analysis considers the case of Rayleigh fading channels when the relaying station as well as the destination undergo mutually independent interfering signals. Particularly, we derive the cumulative distribution function (c.d.f.) of a new type of random variable involving sum of multiple independent exponential random variables, based on which, we present closed-form expressions for the exact outage probability of a fixed amplify-and-forward (AF) and decode-and-forward (DF) relaying protocols. Numerical results are provided to illustrate the joint effect of the delayed feedback and co-channel interference on the outage probability.

关键词： Random variable relaying Feedback relay Delayed Feedback Cochannel interference Raleigh fading channels interference destination

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On the ergodic secrecy capacity of the wiretap channel under imperfect main channel estimation

On the ergodic secrecy capacity of the wiretap channel under...

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Asilomar Conference on Signals, Systems & Computers

作者： Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada

ISBN: (纸本)9781467303217

The ergodic secrecy capacity of the wiretap channel is known when the main channel (between the transmitter and the legitimate receiver) state information (CSI) is perfect at the transmitter and the coherence period is sufficiently large to enable random coding arguments in each block. In a fast fading scenario, when the codeword length spans many coherence periods, the secrecy capacity is still not known. In this paper, we present a framework that characterizes this secrecy capacity under imperfect main channel estimation at the transmitter. Inner and outer bounds on the ergodic secrecy capacity are derived for a class of independent identically distributed (i.i.d.) fading channels. The achievable rate is a simple on-off scheme using a Gaussian input. The upper bound is obtained using an appropriate correlation scheme of the main and the eavesdropper channels. The upper and the lower bounds coincide with recently derived ones in the perfect main CSI extreme. Furthermore, the lower bound matches the upper bound in no main CSI extreme, where the secrecy capacity is equal to zero. Numerical results are provided for independent identically distributed (i.i.d.) Rayleigh fading channels.

关键词： Integrated circuits Channel estimation Signal to noise ratio Cryptography Antennas

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Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos

Design, implementation and analysis of fully digital 1-D con...

引用

International Conference on Microelectronics, ICM

作者： A. S. Mansingka A. G. Radwan K. N. Salama Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Engineering Mathematics Faculty of Engineering Cairo University Cairo Egypt

This paper introduces the fully digital implementation of a 1-D multiscroll chaos generator based on a staircase nonlinearity in the 3rd-order jerk system using the Euler approximation. For the first time, digital design is exploited to provide real-time controllability of (i) number of scrolls, (ii) position in 1-D space, (iii) Euler step size and (iv) system parameter. The effect of variations in these fields on the maximum Lyapunov exponent (MLE) is analyzed. The system is implemented using Verilog HDL and synthesized on an Xilinx Virtex 4 FPGA, exhibiting area utilization less than 3.5% and high performance with experimentally verified throughput up to 3.33 Gbits/s. This fully digital system enables applications in modulation schemes and chaos-based cryptosystems without analog to digital conversion.

关键词： Maximum likelihood estimation Chaotic communication Generators Field programmable gate arrays Approximation methods Hardware design languages

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