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Reduced power consumption in the FPGA-based Universal Link for LVDS communications 7

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Reduced power consumption in the FPGA-based Universal Link f...

7th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2016

作者： Sanchez, Luis Patino, Giancarlo Murray, Victor Lyke, James Department of Electrical Engineering Universidad de Ingenieria y Tecnologia Lima Peru Department of Electrical and Computer Engineering University of New Mexico AlbuquerqueNM United States U.S. Air Force Research Laboratory AlbuquerqueNM United States

ISBN: (纸本)9781467378352

We present a novel version of the FPGA-based Universal Link for LVDS (low-voltage differential signaling) communications that reduces the power consumption by sending the information only when a new data is input. In the a regular LVDS protocol, 4 wires are required for a full duplex communication. The aim of the Universal Link is to reduce the amount of wires in the network by sending data from N signal through a single connection. These new approach reduces the number of bits transmitted to 84% of the original system, when N = 2, and up to 23% for N > 130. Also, the sampling frequency is considerable reduced. © 2016 IEEE.

关键词： Field programmable gate arrays (FPGA)

Bounds on the dynamics of periodic quantum walks and emergence of the gapless and gapped Dirac equation

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Physical Review A 2018年第1期97卷 012116-012116页

作者： N. Pradeep Kumar Radhakrishnan Balu Raymond Laflamme C. M. Chandrashekar The Institute of Mathematical Sciences C. I. T Campus Taramani Chennai 600113 India U.S. Army Research Laboratory Computational and Information Sciences Directorate Adelphi Maryland 20783 USA Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore Maryland 21250 USA Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo Waterloo N2L 3G1 Ontario Canada Perimeter Institute for Theoretical Physics Waterloo N2L 2Y5 Ontario Canada Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai 400094 India

We study the dynamics of discrete-time quantum walk using quantum coin operations, Ĉ(θ1) and Ĉ(θ2), in time-dependent periodic sequence. For the two-period quantum walk with the parameters θ1 and θ2 in the coin operations we show that the standard deviation [σθ1,θ2(t)] is the same as the minimum of standard deviation obtained from one of the one-period quantum walks with coin operations θ1 or θ2, σθ1,θ2(t)=min{σθ1(t),σθ2(t)}. Our numerical result is analytically corroborated using the dispersion relation obtained from the continuum limit of the dynamics. Using the dispersion relation for one- and two-period quantum walks, we present the bounds on the dynamics of three- and higher-period quantum walks. We also show that the bounds for the two-period quantum walk will hold good for the split-step quantum walk which is also defined using two coin operators using θ1 and θ2. Unlike the previous known connection of discrete-time quantum walks with the massless Dirac equation where coin parameter θ=0, here we show the recovery of the massless Dirac equation with nonzero θ parameters contributing to the intriguing interference in the dynamics in a totally nonrelativistic situation. We also present the effect of periodic sequence on the entanglement between coin and position space.

关键词： Quantum algorithms Quantum entanglement Quantum simulation Quantum walks

Symmetry and reduction in collectives: Low-dimensional cyclic pursuit

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Symmetry and reduction in collectives: Low-dimensional cycli...

作者： Galloway, Kevin S. Justh, Eric W. Krishnaprasad, P.S. Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering Us Naval Academy AnnapolisMD21402 United States Naval Research Laboratory WashingtonDC20375 United States

We investigate low-dimensional examples of cyclic pursuit in a collective, wherein each agent employs a constant bearing (CB) steering law relative to exactly one other agent. For the case of three agents in the plane, we characterize relative equilibria and pure shape equilibria of associated closed-loop dynamics. Re-scaling time yields a reduction of phase space to two dimensions and effective tools for stability analysis. Study of bifurcation of a family of collinear equilibria dependent on a single CB control parameter reveals the presence of a rich collection of trajectories that are periodic in shape and undergo precession in physical space. For collectives in three dimensions, with an appropriate notion of CB pursuit strategy and corresponding steering law, the two-agent case proves to be explicitly integrable. These results suggest control schemes for small teams of mobile robotic agents engaged in area coverage tasks such as search and rescue, and raise interesting possibilities for behaviour in biological contexts. © 2016 The Author(s).

关键词： Mobile agents

Physical realization of topological quantum walks on IBM-Q and beyond

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arXiv 2017年

作者： Balu, Radhakrishnan Castillo, Daniel Siopsis, George Computer and Information Sciences Directorate Army Research Laboratory AdelphiMD21005-5069 Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996-1200 United States

We discuss an efficient physical realization of topological quantum walks on a finite lattice. The N-point lattice is realized with log2N qubits, and the quantum circuit utilizes a number of quantum gates which is polynomial in the number of qubits. In a certain scaling limit, we show that a large number of steps is implemented with a number of quantum gates which is independent of the number of steps. We ran the quantum algorithm on the IBM-Q five-qubit quantum computer, thus experimentally demonstrating topological features, such as boundary bound states, on a lattice with N = 4 points. Copyright © 2017, The Authors. All rights reserved.

关键词： Logic gates

Information vs. Uncertainty as the foundation for a science of environmental modeling

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arXiv 2017年

作者： Nearing, Grey S. Gupta, Hoshin V. NASA Goddard Space Flight Center Hydrological Sciences Laboratory GreenbeltMD United States National Center for Atmospheric Research Research Applications Laboratory BoulderCO United States University of Maryland Baltimore County Department of Computer Science and Electrical Engineering CatonsvilleMD United States University of Arizona Department of Hydrology and Atmospheric Sciences TucsonAZ United States

Information accounting provides a better foundation for hypothesis testing than does uncertainty quantification. A quantitative account of science is derived under this perspective that alleviates the need for epistemic bridge principles, solves the problem of ad hoc falsification criteria, and deals with verisimilitude by facilitating a general approach to process-level diagnostics. Our argument is that the well-known inconsistencies of both Bayesian and classical statistical hypothesis tests are due to the fact that probability theory is an insufficient logic of science. Information theory, as an extension of probability theory, is required to provide a complete logic on which to base quantitative theories of empirical learning. The organizing question in this case becomes not whether our theories or models are more or less true, or about how much uncertainty is associated with a particular model, but instead whether there is any information available from experimental data that might allow us to improve the model. This becomes a formal hypothesis test, provides a theory of model diagnostics, and suggests a new approach to building dynamical systems models. Copyright © 2017, The Authors. All rights reserved.

关键词： Information theory

Design of Low-cost Position Differential Positioning System Based on STM32

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Design of Low-cost Position Differential Positioning System ...

Chinese Automation Congress

作者： Haijun Fu Ming Qiu Xisong Dong Gang Xiong Haonan Xiong Xiang Su Shichao Chen Zhen Shen Xiujiang Guo School of Artificial Intelligence Beijing Union University Beijing China The Cloud Computing Center Chinese Academy of Sciences Dongguan China The Qingdao Academy of Intelligent Industries Macau University of Science and Technology Qingdao China Beijing Union University Beijing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China The State Key Laboratory for Management and Control of Complex Systems Chinese Academy of Sciences Beijing China The Beijing Engineering Research Center of Intelligent Systems and Technology Chinese Academy of Sciences Beijing China Department of Computer Science University of Helsinki Fin Finland Measurement Center Station PetroChina Huabei Oilfield Company Renqiu China

There exist some obstacles to realize high-precision positioning with using the position differential technique due to the limiting factors. However, with the advancement of chip performance and the establishment of multiple satellite navigation systems, position differential positioning can be realized to meet the civilian high-precision positioning demand while significantly reducing costs. This paper is to explore the engineering application and propose a new method. Through the experiments and data analysis, we have found the error correlation between two receivers in a small area and designed a set of positioning system, and programmed in the Keil μVision5 in C language. The system consists of the current mainstream low-cost STM32, UBLOX NEO 6M chip, NRF24L01 chip, GPS antenna and power supply module. Each two receivers can form a differential positioning system. At present, the system in the low-speed status is, in the urban environment, basically reaching within 0.5 - 3 m of the positioning error.

关键词： Position differential positioning Low cost Error correlation GPS STM32

MDS code constructions with small sub-packetization and near-optimal repair bandwidth

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arXiv 2017年

作者： Rawat, Ankit Singh Tamo, Itzhak Guruswami, Venkatesan Efremenko, Klim Research Laboratory of Electronics MIT CambridgeMA02139 United States Computer Science Department Carnegie Mellon University PittsburghPA15213 United States Department of Electrical Engineering - Systems Tel Aviv University Ramat Aviv69978 Israel Computer Science Department Carnegie Mellon University PittsburghPA15213 United States Department of Computer Science Tel Aviv University Ramat Aviv69978 Israel

A code C Fn is a collection of M codewords where n elements (from the finite field F) in each of the codewords are referred to as code blocks. Assuming that F is a degree ` extension of a smaller field B, the code blocks are treated as `-length vectors over the base field B. Equivalently, the code is said to have the sub-packetization level `. This paper addresses the problem of constructing MDS codes that enable exact reconstruction (repair) of each code block by downloading small amount of information from the remaining code blocks. The total amount of information flow from the remaining code blocks during this reconstruction process is referred to as repair-bandwidth of the underlying code. The problem of enabling exact reconstruction of a code block with small repair bandwidth naturally arises in the context of distributed storage systems as the node repair problem [7]. The constructions of exact-repairable MDS codes with optimal repair-bandwidth require working with large sub-packetization levels, which restricts their employment in practice. This paper presents constructions for MDS codes that simultaneously provide both small repair bandwidth and small sub-packetization level. In particular, this paper presents two general approaches to construct exact-repairable MDS codes that aim at significantly reducing the required sub-packetization level at the cost of slightly sub-optimal repair bandwidth. The first approach provides MDS codes that have repair bandwidth at most twice the optimal repair-bandwidth. Additionally, these codes also have the smallest possible sub-packetization level ` = O(r), where r denotes the number of parity blocks. This approach is then generalized to design codes that have their repair bandwidth approaching the optimal repair-bandwidth at the cost of graceful increment in the required sub-packetization level. The second approach provides ways to transform an MDS code with optimal repair-bandwidth and large sub-packetization level into

关键词： Repair

Jamming statistics-dependent frequency hopping 35

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Jamming statistics-dependent frequency hopping

35th IEEE Military Communications Conference, MILCOM 2016

作者： Hannon, Matthew Feng, Shaung Kwon, Hyuck Pham, Khanh Department of Electrical Engineering and Computer Science Wichita State University Kansas United States Air Force Research Laboratory Kirtland Air Force BaseNM United States

ISBN: (纸本)9781509037810

This paper studies a jamming statistics-dependent frequency-hopping (FH) pattern generation scheme. Most existing FH patterns are determined by two encryption keys: (a) one for FH in the frequency domain, and (b) the other for time permutation in the time domain. These keys are independent of channel conditions. Hence, an FH signal generated by these two keys occupies the entire spectrum in both frequency and time domains, and the probability of detection by a jammer is low. However, the probability of a hit (or jamming) on the desired user's frequency channels by partial-band noise jamming (PBNJ) can be high because it is inversely proportional to the total number of available frequency positions. Can an FH system with jamming-dependent adaptive FH patterns safeguard the communications systems more effectively? If the answer is yes, then how can an efficient jamming-dependent adaptive FH pattern be found, and can it be implemented cost-effectively for future communications systems against jamming? The aim of this paper is to study answers to the questions posed here. © 2016 IEEE.

关键词： Frequency hopping

Accurate Multi-physics Numerical Analysis of Particle Preconcentration Based on Ion Concentration Polarization

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arXiv 2017年

作者： Li, Zirui Liu, Wei Zhu, Yudan Lu, Xiaohua Gu, Yuantong Han, Jongyoon College of Mechanical and Electrical Engineering Wenzhou University Wenzhou China College of Chemical Engineering State Key Laboratory of Materials-oriented Chemical Engineering Nanjing Tech University Nanjing China School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Australia Department of Biological Engineering Massachusetts Institute of Technology CambridgeMA United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA United States Singapore-MIT Alliance for Research and Technology Singapore Singapore

This paper studies mechanism of preconcentration of charged particles in a straight microchannel embedded with permselective membranes, by numerically solving coupled transport equations of ions, charged particles and solvent fluid without any simplifying assumptions. It is demonstrated that trapping and preconcentration of charged particles are determined by the interplay between drag force from the electroosmotic fluid flow and the electrophoretic force applied trough the electric field. Several insightful characteristics are revealed, including the diverse dynamics of co-ions and counter ions, replacement of co-ions by focused particles, lowered ion concentrations in particle enriched zone, and enhanced electroosmotic pumping effect etc. Conditions for particles that may be concentrated are identified in terms of charges, sizes and electrophoretic mobilities of particles and co-ions. Dependences of enrichment factor on cross-membrane voltage, initial particle concentration and buffer ion concentrations are analyzed and the underlying reasons are elaborated. Finally, post priori a condition for validity of decoupled simulation model is given based on charges carried by focused charge particles and that by buffer co-ions. These results provide important guidance in the design and optimization of nanofluidic preconcentration and other related devices. Copyright © 2017, The Authors. All rights reserved.

关键词： Ions