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检索条件"主题词=error control coding"

共 217 条记录，以下是111-120 订阅

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Multiprocessor Silicon Photonic Interconnects: A Systems Perspective

Multiprocessor Silicon Photonic Interconnects: A Systems Per...

引用

Conference on Optoelectronic Integrated Circuits XIV

作者： Koka, Pranay McCracken, Michael O. Schwetman, Herb Zheng, Xuezhe Ho, Ron Yao, Jin Mitchell, James G. Raj, Kannan Krishnamoorthy, Ashok V. Oracle (United States)

ISBN: (纸本)9780819489081

The high bandwidth density and low power consumption characteristics of silicon photonics devices can provide a high performance interconnect solution for multiprocessor systems. At the same time this technology also poses a new set of constraints and challenges in architecting, designing, and integrating such systems. The "macrochip" multiprocessor architecture leverages a photonically interconnected array of processor and/or memory chips to provide a flexible platform to build heterogeneous systems. The design considerations for such a system are influenced largely by the system architecture, the programming model and devices needed for their implementation. This talk will first describe the macrochip platform, technology constraints and potential interconnect solutions with the various device building blocks. Then it will present some topology choices that range from a WDM point-to-point interconnect to more complex switched data channel networks. It will close with a detailed analysis of these design choices and show the impact of the device constraints on performance and power consumption along with some recent ultra-low power device implementation results.

关键词： error control coding Silicon photonics error analysis Silicon Computer programming Optical interconnects Telecommunications Holmium Waveguides Wavelength division multiplexing

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error CODES APPLIED TO OPTICAL ALGEBRAIC PROCESSORS 3

ERROR CODES APPLIED TO OPTICAL ALGEBRAIC PROCESSORS

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CONF ON OPTICAL INFORMATION PROCESSING SYSTEMS AND ARCHITECTURES 3

作者： ELLETT, SA WALKUP, JF KRILE, TF Texas Tech Univ. (United States)

ISBN: (纸本)0819406929

Optical algebraic processors can perform complex calculations in parallel and at high speeds. However, they commonly suffer from a low analog accuracy which hinders their widespread application. error detection and correction codes provide one technique for improving the accuracy of optical algebraic processors. The use of these codes would allow some of the errors that may occur during a computation to be detected and possibly corrected. This paper describes the results of various computer simulations of optical matrix-vector multipliers employing error-correction codes. It discusses the application of convolutional codes to optical matrix-vector multipliers along with several block codes. Both binary and nonbinary codes are considered. The results indicate that a significant improvement in performance can be obtained when compared with processors not employing error-correction codes. Also, the type of noise, whether signal-independent or signal-dependent noise, has a significant effect on the performance of a matrix-vector multiplier employing an error code. The encoding and decoding operations required for the error codes can be performed optically.

关键词： Forward error correction Binary data Interference (communication) Computer programming Computer simulations error control coding Optical signal processing Signal detection Data storage error analysis

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MULTIPARTICLE SUPERSONIC IMPACT TEST PROGRAM

MULTIPARTICLE SUPERSONIC IMPACT TEST PROGRAM

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CONF ON WINDOW AND DOME TECHNOLOGIES AND MATERIALS 2

作者： ADLER, WF BOLAND, PL General Research Corp. (United States) Raytheon Co. (United States)

ISBN: (纸本)0819403873

A review of the existing rain erosion test capabilities has shown that it is difficult to obtain multiple waterdrop impacts on materials over an extended range of supersonic velocities which are both well-documented and at moderate cost. Recognition of this deficiency motivated the development of a facility located at General Research Corporation (GRC) in Santa Barbara, CA to provide controlled multiple1 simulated waterdrop impact conditions for impact velocities from 300 to 1700 ms (up to Mach 5). A collection of particles, selected for their capacity to simulate waterdrop impact damage, are propelled at the target using a 50 mm powder gun. The development and anticipated capability of this facility is described. A discussion is then presented of the planned test program designed to formulate and validate damage models for electromagnetic (EM) window materials in the supersonic flight regime.

关键词： Particles Silicon Polymethylmethacrylate Sapphire Zinc error control coding Gases Infrared materials Optical spheres Polymers

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An Analysis of the ATCS Generator Polynomial 67

An Analysis of the ATCS Generator Polynomial

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67th Annual Reliability and Maintainability Symposium (RAMS)

作者： DeLong, Todd Reutzel, Joseph Univ Virginia Dept Elect & Comp Engn 351 McCormick RdThornton Hall E208 Charlottesville VA 22904 USA Hitachi STS Inc 1000 Technol Dr Pittsburgh PA 15219 USA

ISBN: (纸本)9781728180175

The Advanced Train control Systems (ATCS) specification provides a generator polynomial for calculating a vital Cyclic Redundancy Checksum (CRC) for computer-based communication and control. Unfortunately, very little if any published information exists concerning its design and performance. This paper presents an analysis of a code that uses the generator polynomial, providing what the authors believe is the first evidence of the minimum Hamming distance, thus supporting the use of the generator polynomial to provide vital serial communication in safety-critical railway systems.

关键词： error analysis error control coding software and system safety

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Integrated extension board for on-board computer (OBDH) of SSETI ESEO satellite - art. no. 69370A

Integrated extension board for on-board computer (OBDH) of S...

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Conference on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2007

作者： Cichockia, Andrzej Graczyk, Rafal Warsaw Univ Technol Inst Elect Syst PL-00661 Warsaw Poland

ISBN: (纸本)9780819471246

This paper holds an information about an extension module for Single Board Computer (MIP405), which is the heart of On-board Data Handling Module (OBDH) of student Earth's microsatellite - SSETI ESEO. OBDH is a PC104 stack of four boards electrically connected and mechanically fixed. On-Board Computer is a key subsystem to the mission success - it is responsible for distribution of control signals to each module of the spacecraft. It is also expected to gather critical data for an appropriate mission progress, implementation of a part of algorithms used for satellite stabilization and orbit control and, at last, processing telecommands. Since whole system should meet spaceborne application requirements, it must be exceptionally reliable.

关键词： Field programmable gate arrays error control coding Satellites Computer programming Temperature metrology Clocks Commercial off the shelf technology Data acquisition Manufacturing Reliability

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Iterative detection for imaging page-oriented optical data storage systems

Iterative detection for imaging page-oriented optical data s...

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20th Congress of the International-Commission-for-Optics

作者： Intharasombat, N Ho, TW Sawchuk, AA Univ So Calif Signal & Image Proc Inst 3740 McClintock Ave Los Angeles CA 90089 USA

ISBN: (纸本)0819460583

Imaging page-oriented optical data storage, with its high bit packing density and many parallel readout channels, offers a solution for high capacity data storage with fast data transfer rate. As in any data storage system, increasing the packing density increases the effect of inter-symbol interference (ISI) and inter-page interference (IPI). We describe a combination of modulation encoding/decoding and error correction that overcomes this interference allowing high packing density in the presence of noise while maintaining acceptable bit error rate (BER). We also describe an extension of the algorithm to multi-level (grayscale) encoding.

关键词： Imaging systems Data storage Detection and tracking algorithms Computer programming Optical imaging Modulation Optical storage Binary data Systems modeling error control coding

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Improved Thermoelectric Cooling Based on the Thomson Effect

Improved Thermoelectric Cooling Based on the Thomson Effect

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Conference on Tri-Technology Device Refrigeration (TTDR)

作者： Snyder, G. Jeffrey Khanna, Raghav Toberer, Eric S. Heinz, Nicholas A. Seifert, Wolfgang CALTECH Mat Sci 1200 E Calif Blvd Pasadena CA 91125 USA Colorado Sch Mines Dept Phys Golden CO 80401 USA Univ Halle Wittenberg Inst Phys D-06099 Halle Germany

ISBN: (纸本)9781510600621

Traditional thermoelectric cooling relies on the Peltier effect which produces a temperature drop limited by the figure of merit, zT. This cooling limit is not required from classical thermodynamics but can be traced to problems of thermoelectric compatibility. Alternatively, if a thermoelectric cooler can be designed to achieve full thermoelectric compatibility, lower temperature can be achieved even if the zT is low. In such a device the Thomson effect plays an important role. We present the theoretical concept of a "Thomson cooler," for cryogenic cooling which is designed to maintain thermoelectric compatibility and we derive the requirements for the Seebeck coefficient.

关键词： Thermoelectric materials Technetium Cryogenics error control coding Performance modeling Physics Thermodynamics Visualization Mining Picture Archiving and Communication System

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Coded spreading with m-sequences

Coded spreading with <i>m</i>-sequences

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61st IEEE Vehicular Technology Conference

作者： Ekici, O Univ Ottawa Sch Informat Technol & Engn Ottawa ON K1N 6N5 Canada

ISBN: (纸本)0780388879

In this paper, maximum length shift register (MLSR) sequences are jointly utilized for channel coding and data spreading. Compared to uncoded spreading, more than 5 dB coding gain is obtained at BER of 10(-3) in Additive White Gaussian Noise (AWGN) channel. The coding gain increases up to 22 dB in Rayleigh fading channel. In the proposed algorithm, information bits are segmented into blocks and coded by cyclic MLSR coding. The code word output of the systematic MLSR encoder (in-sequence) is then used for spreading the uncoded information bits in each data block. At the receiver, autocorrelation property of the in-sequences is used for mutual despreading and decoding of received signal. Optimum soft decision decoder is implemented by a parallel bank of correlators, which are matched to each spreading sequence. Despreading and channel decoding operations are performed concurrently. The ingenuity of the algorithm lies in the fact that all the redundant channel coding bits are carried by spreading sequences, and thus avoids energy per information bit loss due to channel coding. Utilizing the same spreading code for all the data bits in the block provides diversity, which improves the performance substantially in fading channels.

关键词： error control coding CDMA m-sequence

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Spreading strategies for MIMO-CDMA in presence of channel estimation errors and spatial correlation

Spreading strategies for MIMO-CDMA in presence of channel es...

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69th IEEE Vehicular Technology Conference

作者： Dahmane, Adel Omar D'Amours, Claude Univ Quebec Trois Rivieres Dept Elect & Comp Engn Trois Rivieres PQ GA9 5H7 Canada Univ Ottawa Sch Informat Technol & Engn Ottawa ON Canada

ISBN: (纸本)9781424425167

Parity bit selected spreading and permutation spreading have been proposed as alternative techniques for assigning spreading codes to different users in a multiple input multiple output Direct-Sequence Code Division multiple Access (MIMO-CDMA). In frequency selective fading with perfect channel estimates and in the absence of spatial correlation, the two techniques have similar performance in terms of quality of service and capacity. In this paper, channel estimation errors and spatial correlation effects are considered to study the robustness of these two spreading strategies. Simulation results show that both spreading strategies outperform the conventional system. Moreover, permutation spreading system is much more robust when compared to parity bit selected spreading system in the presence of spatial correlation and channel estimation errors.

关键词： CDMA error control coding Frequency selective channels Maximum likelihood detection MIMO

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Optimization of error Pattern Embedding Steganography within error-Correcting Code Frameworks

Optimization of Error Pattern Embedding Steganography within...

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2024 Military Communications Conference

作者： Jang, Yongkyu Zhang, Minglong Kirchner, Andre Jones, Bryan A. Marojevic, Vuk Kim, Taejoon Love, David J. Purdue Univ W Lafayette IN 47907 USA Mississippi State Univ Mississippi State MS USA Arizona State Univ Tempe AZ USA

ISBN: (纸本)9798350374247;9798350374230

The importance of secure wireless communication is increasing as adversaries' eavesdropping capabilities become more advanced. In this paper, we propose a novel steganography method that utilizes error pattern embedding to minimize the likelihood of detection by eavesdroppers. Unlike existing error pattern embedding steganography, we introduce a secret codebook generation algorithm designed to maximize the secret codebook size. Our algorithm is applicable to any coding scheme that possesses a predefined maximum number of correctable errors. In addition, we propose a novel steganalysis scheme for error pattern embedding steganography. Our method is based on comparing two distinct empirical relative entropies: one derived from the empirical probability mass function (pmf) of observed transmitted signals and the other from the empirical pmf of randomly generated signals following a Bernoulli(1/2) distribution. Simulation results indicate that our algorithm enhances security by effectively reducing the detection probability by the eavesdropper while simultaneously increasing the capacity for secret information.

关键词： Steganography Steganalysis error control coding Secret Codeword Secret Codebook

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