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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...

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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...

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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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Cooperative Spectrum Sensing over Non-Identical Nakagami Fading Channels

Cooperative Spectrum Sensing over Non-Identical Nakagami Fad...

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IEEE Conference on Vehicular Technology (VTC)

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

Previous works in cooperative spectrum sensing assumed that the channels for sensing and reporting are independent identically distributed (i.i.d). A more practical and appropriate assumption, however, should be that the sensing channels and reporting channels are independent but not necessarily identically distributed (i.n.i.d). In this paper, we derive the false-alarm probability and the detection probability of cooperative spectrum sensing with energy fusion over i.n.i.d Nakagami fading channels. Selected numerical results show that cooperative spectrum sensing still gives considerably better performance results even over i.n.i.d fading channels.

关键词： Nakagami distribution Manganese Sensors Rayleigh channels Signal to noise ratio Cognitive radio

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A fire alarm vision system based on IR image processing

A fire alarm vision system based on IR image processing

引用

5th International Conference on New Trends in Information science and Service science, NISS 2011

作者： Kim, Won-Ho Kim, Seung-Kyeom Lee, Jong-Ho Hyun, Chang-Ho Division of Electrical Electronic and Control Engineering College of Engineering Kongju National University Cheonan Korea Republic of Grant of the Korean Ministry of Education Science and Technology Regional Core Research Program Zero Energy Green Village Technology Center Korea Republic of Research-year Program of Kongju National University Korea Republic of

ISBN: (纸本)9788988678626

This paper presents a fire alarm vision system based on flame detection algorithm of infrared image. The presented flame detection algorithm measures the luminance variation of candidate flame blocks of the IR image and it determines existence of the fire according to the amount of variation of luminance. By using the test images, the simulation of flame detection algorithm was performed and implemented fire alarm vision system was tested. As a result, the evaluated correct detection ratio was 85.7%. © 2011 AICIT.

关键词： Luminance

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