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Random number generation based on digital differential chaos

Random number generation based on digital differential chaos

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： M. Affan Zidan A. G. Radwan K. N. Salama Electrical Engineering Program King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia Department of Engineering Mathematics Cairo University Egypt

In this paper, we present a fully digital differential chaos based random number generator. The output of the digital circuit is proved to be chaotic by calculating the output time series maximum Lyapunov exponent. We introduce a new post processing technique to improve the distribution and statistical properties of the generated data. The post-processed output passes the NIST Sp. 800-22 statistical tests. The system is written in Verilog VHDL and realized on Xilinx Virtex ® FPGA. The generator can fit into a very small area and have a maximum throughput of 2.1 Gb/s.

关键词： Chaos Logic gates World Wide Web Cryptography Table lookup

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Combining ambiguous chemical shift mapping with structure-based backbone and NOE assignment from 15N-NOESY 11

Combining ambiguous chemical shift mapping with structure-ba...

引用

2011 ACM Conference on Bioinformatics, Computational Biology and Biomedicine, ACM-BCB 2011

作者： Jang, Richard Gao, Xin Li, Ming David R. Cheriton School of Computer Science University of Waterloo 200 University Avenue West Waterloo ON N2L 3G1 Canada Division of Mathematical and Computer Sciences and Engineering King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia

ISBN: (纸本)9781450307963

Chemical shift mapping is an important technique in NMRbased drug screening for identifying the atoms of a target protein that potentially bind to a drug molecule upon the molecule's introduction in increasing concentrations. The goal is to obtain a mapping of peaks with known residue assignment from the reference spectrum of the unbound protein to peaks with unknown assignment in the target spectrum of the bound protein. Although a series of perturbed spectra help to trace a path from reference peaks to target peaks, a one-to-one mapping generally is not possible, especially for large proteins, due to errors, such as noise peaks, missing peaks, missing but then reappearing, overlapped, and new peaks not associated with any peaks in the reference. Due to these difficulties, the mapping is typically done manually or semi-automatically. However, automated methods are necessary for high-throughput drug screening. We present PeakWalker, a novel peak walking algorithm for fast-exchange systems that models the errors explicitly and performs many-to-one mapping. On the proteins: hBclXL, UbcH5B, and histone H1, it achieves an average accuracy of over 95% with less than 1.5 residues predicted per target peak. Given these mappings as input, we present PeakAssigner, a novel combined structure-based backbone resonance and NOE assignment algorithm that uses just 15N-NOESY, while avoiding TOCSY experiments and 13C- labeling, to resolve the ambiguities for a one-toone mapping. On the three proteins, it achieves an average accuracy of 94% or better. Copyright © 2011 ACM.

关键词： Mapping

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Bio-inspired nano-photodiode for Low Light, High Resolution and crosstalk-free CMOS image sensing

Bio-inspired nano-photodiode for Low Light, High Resolution ...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Fayçal Saffih Nathaniel N. Fitzpatrick Mohammad A. Mohammad Stephane Evoy Bo Cui Physical Science and Engineering King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Electrical and Computer Engineering Department University of Waterloo Waterloo ONT Canada

Previous attempts have been devoted to mimic biological vision intelligence at the architectural system level. In this paper, a novel imitation of biological visual system intelligence is suggested, at the device level with the introduction of novel photodiode morphology. The proposed bio-inspired nanorod photodiode puts the depletion region length on the path of the incident photon instead of on its width, as the case is with the planar photodiodes. The depletion region has a revolving volume to increase the photodiode responsivity, and thus its photosensitivity. In addition, it can virtually boost the pixel fill factor (FF) above the 100% classical limit due to decoupling of its vertical sensing area from its limited planar circuitry area. Furthermore, the suggested nanorod photodiode photosensitivity is analytically proven to be higher than that of the planar photodiode. We also show semi-empirically that the responsivity of the suggested device varies linearly with its height; this important feature has been confirmed using Sentaurus simulation. The proposed nano-photorod is believed to meet the increasingly stringent High-Resolution-Low-Light (HRLL) detection requirements of the camera-phone and biomedical imaging markets.

关键词： Photodiodes Sensitivity CMOS integrated circuits Pixel Nanobioscience Anodes Photonics

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ZnO nanorods for simultaneous light trapping and transparent electrode application in solar cells

ZnO nanorods for simultaneous light trapping and transparent...

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IEEE Photonics Conference (IPC)

作者： Y. Khan Y. Zhang M. Amin A. Bayraktaroglu T. K. Ng H. Bağcı J. Phillips B. S. Ooi Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

Efficacy of using vertically grown ZnO nanorod array in enhancing electromagnetic field intensity and serving as the top contact layer (transparent electrodes) for solar cells was investigated.

关键词： Zinc oxide Photovoltaic cells Indium tin oxide Electrodes Glass Charge carrier processes Optical variables control

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Optical and micro-structural characterizations of MBE grown indium gallium nitride polar quantum dots

Optical and micro-structural characterizations of MBE grown ...

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International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Rami T. ElAfandy Tien Khee Ng Yang Yang Dongkyu Cha Bei Zhang Lan Zhao Meng Zhang Pallab Bhattacharya Boon S. Ooi Division of Physical Sciences and Engineering King Abdullah University of Science & Technology (KAUST) Thuwal Saudi Arabia Advanced Nanofabrication King Abdullah University of Science & Technology (KAUST) Thuwal Saudi Arabia Department of Electrical Engineering and Computer Science University of Michigan Michigan United States of America

Comparison between indium rich (27%) InGaN/GaN quantum dots (QDs) and their underlying wetting layer (WL) is performed by means of optical and structural characterizations. With increasing temperature, micro-photoluminescence (μPL) study reveals the superior ability of QDs to prevent carrier thermalization to nearby traps compared to the two dimensional WL. Thus, explaining the higher internal quantum efficiency of the QD nanostructure compared to the higher dimensional WL. Structural characterization (X-ray diffraction (XRD)) and transmission electron microscopy (TEM)) reveal an increase in the QD indium content over the WL indium content which is due to strain induced drifts.

关键词： Optical variables measurement Optical saturation Optical imaging Size measurement Gallium nitride Temperature dependence

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Transmit Antenna Selection Based on Shadowing Side Information

Transmit Antenna Selection Based on Shadowing Side Informati...

引用

IEEE Conference on Vehicular technology (VTC)

作者： Ferkan Yilmaz Ahmet Yilmaz Mohamed-Slim Alouini Oguz Kucur Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electronics Engineering Department Gebze Institute of Technology (GYTE) Gebze Kocaeli Turkey

In this paper, we propose a new transmit antenna selection scheme based on shadowing side information. In the proposed scheme, single transmit antenna which has the highest shadowing coefficient is selected. By the proposed technique, usage of the feedback channel and channel estimation complexity at the receiver can be reduced. We consider independent but not identically distributed Generalized-K composite fading model, which is a general composite fading & shadowing channel model for wireless environments. Exact closed-form outage probability, moment generating function and symbol error probability expressions are derived. In addition, theoretical performance results are validated by Monte Carlo simulations.

关键词： Transmitting antennas Fading Receiving antennas Shadow mapping Wireless communication

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On the statistics of uplink inter-cell interference with greedy resource allocation

On the statistics of uplink inter-cell interference with gre...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Hina Tabassum Ferkan Yilmaz Zaher Dawy Mohamed Slim Alouini Physical Sciences and Engineering Division King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

In this paper, we introduce a new methodology to model the uplink inter-cell interference (ICI) in wireless cellular networks. The model takes into account both the effect of channel statistics (i.e., path loss, shadowing, fading) and the resource allocation scheme in the interfering cells. Firstly, we derive a semi-analytical expression for the distribution of the locations of the allocated user in a given cell considering greedy resource allocation with maximum signal-to-noise ratio (SNR) criterion. Based on this, we derive the distribution of the uplink ICI from one neighboring cell. Next, we compute the moment generating function (MGF) of the cumulative ICI observed from all neighboring cells and discuss some examples. Finally, we utilize the derived expressions to evaluate the outage probability in the network. In order to validate the accuracy of the developed semi-analytical expressions, we present comparison results with Monte Carlo simulations. The major benefit of the proposed mechanism is that it helps in estimating the distribution of ICI without the knowledge of instantaneous resource allocations in the neighbor cells. The proposed methodology applies to any shadowing and fading distributions. Moreover, it can be used to evaluate important network performance metrics numerically without the need for time-consuming Monte Carlo simulations.

关键词： Interference Fading Resource management Signal to noise ratio Shadow mapping Probability density function Downlink

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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

General Assembly and Scientific Symposium, URSI

作者： Abdulkadir C. Yücel Hakan Bağci Eric Michielssen Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia

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). In recent years, stochastic collocation (SC) methods, especially those leveraging generalized polynomial chaos (gPC) expansions, have received significant attention. 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.

关键词： Stochastic processes Random variables Computational modeling Electromagnetic compatibility Electromagnetic interference Iterative methods Adaptation models

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Sum rate maximization in the uplink of multi-cell OFDMA networks

Sum rate maximization in the uplink of multi-cell OFDMA netw...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Hina Tabassum Zaher Dawy Mohamed Slim Alouini Physical Sciences and Engineering Division King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

Resource allocation in orthogonal frequency division multiple access (OFDMA) networks plays an imperative role to guarantee the system performance. However, most of the known resource allocation schemes are focused on maximizing the local throughput of each cell, while ignoring the significant effect of inter-cell interference. This paper investigates the problem of resource allocation (i.e., subcarriers and powers) in the uplink of a multi-cell OFDMA network. The problem has a non-convex combinatorial structure and is known to be NP hard. Firstly, we investigate the upper and lower bounds to the average network throughput due to the inherent complexity of implementing the optimal solution. Later, a centralized sub-optimal resource allocation scheme is developed. We further develop less complex centralized and distributed schemes that are well-suited for practical scenarios. The computational complexity of all schemes has been analyzed and the performance is compared through numerical simulations. Simulation results demonstrate that the distributed scheme achieves comparable performance to the centralized resource allocation scheme in various scenarios.

关键词： Resource management Throughput Complexity theory Interference Signal to noise ratio Upper bound Fading

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Non-Coherent Capacity of Secret-Key Agreement with Public Discussion

Non-Coherent Capacity of Secret-Key Agreement with Public Di...

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IEEE International Conference on Communications Workshops, ICC

作者： Anurag Agrawal Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai India King Abdullah University for Science and Technology Thuwal Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada

We study the Rayleigh fading non-coherent capacity of secret-key agreement with public discussion, where neither the sender nor the receivers have access to instantaneous channel state information (CSI) of any channel. We present two results. At high Signal-to-Noise Ratio (SNR), the secret-key capacity is bounded in SNR, regardless of the number of antennas at each terminal. Second, for a system with a single antenna at both the legitimate and the eavesdropper terminals and an arbitrary number of transmit antennas, the secret-key capacity-achieving input distribution is discrete, with a finite number of mass points. Numerically we observe that at low-SNR, the capacity achieving distribution has two mass points with one of them at the origin.

关键词： Signal to noise ratio Receivers Channel models Rayleigh channels Cryptography Random variables

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