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2008 IEEE International Symposium on Circuits and systems (ISCAS 2008), vol.7

作者： Jacob N. Allen Safa B. Hasan Hoda S. Abdel-Aty-Zohdy Robert L. Ewing Microelectronics System Design Lab Department of Elect. and Computer Engineering Oakland University MI USA Information Directorate Air Force Research Laboratories Wright Patterson Air Force Base OH USA

A simulation model for polymer film chemical sensors is developed based on a 1 dimensional diffusion equation. Using this model, electronic nose smell prints produced by the 32 sensor array of a Cyranose 320 are simulated to test pattern classification. A Haar wavelet filter reduces noise and captures information about the diffusion rate of the analyte in each sensor. Inputs are encoded into a binary Hamming pattern and fed into a binary spiking neural network for pattern classification. The preprocessing circuit for the spiking neural network, including the wavelet filter, is designed using standard cells for an 180nm process. Real and simulated results from the spiking neural network classification algorithm are favorably compared to Bayes, Canonical, and PCA-PNN classifiers.

关键词： Neural networks Circuit simulation Sensor arrays Chemical sensors Pattern classification Polymer films Equations Electronic noses Electronic equipment testing Circuit testing

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Fractional-Order Signal Processing using a Polymer-Electrolyte Transistor

Fractional-Order Signal Processing using a Polymer-Electroly...

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51st Midwest Symposium on Circuits and systems (MWSCAS 2008), vol.2

作者： Robert L. Ewing Hoda S. Abdel-Aty-Zohdy Michael C. Hollenbeck Kenneth S. Stevens Information Directorate US Air Force Research Laboratory OH USA Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester MI USA Department of Electrical and Computer Engineering University of Utah Salt Lake UT USA

Fractional-order systems have applications in the areas of Flight Control, Robotics, Missile Guidance, Control of Structural Vibrations of Space Platforms and Sensor Technology. Fractional-order transfer functions can characterize complex nonlinear dynamics with many fewer parameters than integer-order functions. This paper addresses the use of a polymer-electrolyte transistor (PET) for use in implementating fractional-order algorithms for signal processing. The PET's advantage over the conventional RC and RL circuits is that it can be both functionally scaled and varied for dynamic fractional-order parameter controllability.

关键词： Fractional-Order Signal Processing Polymer-electrolyte transistor Acid/base chemistry Diffusion Electrokinetic flow

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Impacts of CFO, IQ Imbalance and Phase Noise on the system performance in OFDM systems

Impacts of CFO, IQ Imbalance and Phase Noise on the system p...

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The 11th IEEE International Conference on Communications systems(第11届电子和电气工程师协会国际通信系统会议)(IEEE ICCS 2008)

作者： Rong Zhang Edward K.S.Au Roger S.Cheng Wireless IC System Design Center HKUST Fok Ying Tung Graduate SchoolNanshaChina Modulation and Coding Department Institute for Infocomm ResearchA*STARSingapore Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

OFDM systems are sensitive to front-end imperfections including CFO, IQ imbalance and phase noise. In practice, these imperfections are inevitable and would lead to significant performance degradation. In this paper, a general closed-form expression on average signal-to-interference-and-noise ratio (SINR) over multipath fading channels is derived for performance evaluation. When additive white Gaussian noise channels and flat fading channels are considered, the expression reduces to an exact expression and a tight upper bound, respectively. Our results show that the average SINR is inversely proportional to these front-end non-idealities.

关键词： Phase noise system performance OFDM modulation Signal to noise ratio Fading AWGN Modulation coding Degradation Closed-form solution Additive white noise

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Time-of-arrival estimation for IR-UWB systems in dense multipath environment

Time-of-arrival estimation for IR-UWB systems in dense multi...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Yizhi Xu Edward K. S. Au Albert K. Wong Qin Wang Wireless IC System Design Center HKUST Fok Ying Tung Graduate School Nansha China Modulation and Coding Department Institute for Infocomm Research Agency for Science Technology and Research Singapore Department ofElectronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China School ofInformation Engineering University of Science and Technology of Beijing Beijing China

In this paper, a novel time-of-arrival estimation algorithm is proposed for impulse radio-based UWB systems in dense multipath environment. In particular, a dedicated ranging sequence with good cross-correlation property is proposed and a threshold-based search-back unit is introduced, with the purpose of supporting high-precision ranging even at low signal-to-noise ratio. An approximate closed-form expression on the optimal threshold is derived based on the Rayleigh statistical analysis, and its accuracy and tightness are verified by simulations. Results show that the proposed ranging scheme achieves an excellent mean absolute error performance in the order of nanoseconds without introducing too much latency.

关键词： Time of arrival estimation Matched filters design engineering Signal to noise ratio Statistical analysis Ultra wideband technology Bandwidth Mathematical model Closed-form solution Analytical models

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Hybrid splitting criteria based on purity measures

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WSEAS Transactions on computers 2007年第5期6卷 843-850页

作者： Povalej, Petra Kokol, P. Laboratory for System Design Faculty for Electrical Engineering and Computer Science University of Maribor Smetanova ulica 17 2000 Maribor Slovenia

Decision trees are one of the most transparent methods probably most often used for solving classification, tasks. In the process of decision tree induction a lot of input parameters have to be fine-tuned in order to obtain good results. However the most important and probably most influential parameter in top-down induction method is a splitting criterion, which can vary from one classification task to another. In this paper we empirically tested four of them, based on well known purity measures, on 54 UCI databases. Although none of the proposed splitting criterion in the literature has proved to be universally better than the rest, they are not always suitable for solving any classification task. Therefore we propose two new splitting criteria: hybrid linear combination of purity measures and voting of purity measures, which obtain at least comparable results to other well-known criteria used in greedy decision tree induction method, while their structure makes them ideal for non-expert users. Boosting was also applied as one of the most successful ensemble methods, which once again proved the ability to significantly improve the classification accuracy on many databases.

关键词： Classification (of information)

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Bandwidth-reusable CDMA NoC with flexible codeword assignment

Bandwidth-reusable CDMA NoC with flexible codeword assignmen...

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2007 7th International Conference on ASIC, ASICON 2007

作者： Woojoon, Lee Sobelman, Gerald E. VLSI System Design Group Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 United States

ISBN: (纸本)1424411327

In this paper, we propose a novel and flexible codeword assignment technique for a Code Division Multiple Access (CDMA) based Network-on-Chip (NoC). This approach allows bandwidth to be reallocated to ports dynamically on an as-needed basis. In this way, more of the available system bandwidth can be utilized under practical traffic conditions. In addition, wormhole routing is applied to minimize the hardware overhead of the technique. Our switch has been synthesized using 0.13m CMOS high-speed ASIC library. Synthesis results and performance analysis data are provided. © 2007 IEEE.

关键词： Network-on-chip

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Multi-level signaling for energy-efficient on-chip interconnects

Multi-level signaling for energy-efficient on-chip interconn...

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2007 7th International Conference on ASIC, ASICON 2007

作者： Rokhani, Fakhrul Zaman Sobelman, Gerald E. VLSI System Design Group Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 United States

ISBN: (纸本)1424411327

In this paper, we develop multi-level signaling schemes for on-chip interconnects in order to achieve energy-efficient communication. The methodology uses both bus multiplexing and low-swing signaling characteristics, while keeping the total bus area fixed. A physics-based energy model for coupling capacitance is developed which accurately captures the energy consumption of very deep sub-micron (VDSM) on-chip interconnect in the context of multi-level signals. Results show that our proposed bus achieves energy savings for intermediate-layer interconnect lines of as much as 76% compared to binary signaling. In addition, wire bandwidth is improved by up to 16% compared to prior approaches. © 2007 IEEE.

关键词： Energy utilization

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Signal and power integrity co-simulation for multi-layered system on package modules

Signal and power integrity co-simulation for multi-layered s...

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IEEE International Symposium on Electromagnetic Compatibility, EMC 2007

作者： Bharath, Krishna Engin, Ege Swaminathan, Madhavan Uriu, Kazuhide Yamada, Toru School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States EMC Design Group System Engineering Center Matsushita Electric Industrial Co. Ltd.

ISBN: (纸本)1424413508

The coupling of simultaneous switching noise (SSM) in mixed signal system on package modules is a critical signal and power integrity (SI/PI) problem. In the presence of split planes and apertures, SSN coupling occurs both horizontally as well as vertically across layers. Thus, to catch SI and PI problems at an early stage of design requires fast signal and power co-simulation methodologies. In this paper, we outline the multi-layer finite difference method and how the accuracy of the technique can be enhanced with models for fringe and gap effects. We then briefly describe a method for integrating the signal distribution network with the power distribution network to enable co-simulation. The method is then applied to a mixed signal board containing split planes, and numerical results are compared to full-wave simulations. © 2007 IEEE.

关键词： system-on-package

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Distributive high-rate space-frequency codes achieving full cooperative and multipath diversities for asynchronous cooperative communications

Distributive high-rate space-frequency codes achieving full ...

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IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference

作者： Li, Yabo Zhang, Wei Xia, Ng-Gen Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 Department of Electrical and Computer Engineering University of Delaware CDMA System Design Group Nortel Networks Richardson TX 75082 Department of Electric and Electronic Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

ISBN: (纸本)142440357X

Using OFDM and space-time coding to achieve asynchronous cooperative diversity has been proposed by Mei et. al. [13] and Shin et al [14], where orthogonal space-time block codes, Alamouti code in particular, were used at relay nodes. This proposed space-time coding can not achieve the multipath diversity when the channels from nodes to nodes are frequency selective fading. In this paper, we also consider asynchronous cooperative communications where the channels are assumed to be frequency-selective fading. We design high rate distributed space-frequency codes to achieve both full asynchronous cooperative diversity and multipath diversities. © 2006 IEEE.

关键词： Public key cryptography

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Bandwidth-reusable CDMA NoC with flexible codeword assignment

Bandwidth-reusable CDMA NoC with flexible codeword assignmen...

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International Conference on ASIC

作者： Woojoon Lee Gerald E. Sobelman VLSI System Design Group Department of Electrical and Computer Engineering University of Minnesota MN USA

In this paper, we propose a novel and flexible codeword assignment technique for a Code Division Multiple Access (CDMA) based Network-on-Chip (NoC). This approach allows bandwidth to be reallocated to ports dynamically on an as-needed basis. In this way, more of the available system bandwidth can be utilized under practical traffic conditions. In addition, wormhole routing is applied to minimize the hardware overhead of the technique. Our switch has been synthesized using a 0.3 mum CMOS high-speed ASIC library. Synthesis results and performance analysis data are provided.

关键词： Multiaccess communication Network-on-a-chip Bandwidth Switches Telecommunication traffic Routing Hardware Network synthesis Application specific integrated circuits Libraries

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