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International Symposium on Telecommunications

作者： Ronaldo de Freitas Zampolo Jaume Rius I Riu Elmar Trojer Boris Dortschy Signal Processing Laboratory LaPS at Federal University of Pará Belem Para Brazil ASP Laboratory EAB Alvsjo Sweden

ISBN: (纸本)9781424436446;8589748049

In this paper the spectral features of impulse noise in DSL systems are mapped from the waveform domain onto the symbol domain, considering a QAM receiver. This work can be viewed as part of a full symbol domain model for impulse noise, which should include the amplitude and spectral aspects. Since the available models of impulse noise in DSL are generally waveform-based, this kind of mapping is justified when symbol-based simulations are intended, in order to avoid computational overhead due to demodulating noise samples generated on waveform domain. The analytical development of such mapping is provided as well as some simulation results.

关键词： DSL Noise level Noise generators Quadrature amplitude modulation Computational modeling Analytical models Noise measurement Pulse measurements performance evaluation Statistics

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performance of Downlink Spatial-Multiplexing in Urban Macrocellular Multi-User MIMO Scenarios

Performance of Downlink Spatial-Multiplexing in Urban Macroc...

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

作者： Thomas Fugen Malgorzata Porebska Werner Wiesbeck Institut für Höchstfrequenztechnik und Elektronik Universität Karlsruhe Germany

The aim of this paper is to compare the performance of different smart antenna algorithms to the performance of a conventional SISO reference system in an urban multi-user MIMO scenario. A single cell with three 120 deg sectors and several moving users is used for evaluation. The scenario as well as the channel information is generated by means of a realistic urban channel model that consists of a model of the city of Karlsruhe, a mobility model and an accurate ray-tracing based wave propagation model. The smart antenna algorithms under test are two single-user MIMO algorithms (user specific beamforming, waterfilling) and two multi-user MIMO algorithms (block diagonalization, successive optimization). simulation results show clearly the potential of downlink spatial-multiplexing to improve the system capacity, to reduce the exposure, the transmit power and therefore also the operating costs in future cellular mobile radio systems

关键词： Downlink MIMO Cities and towns Ray tracing Power system modeling Antennas and propagation Testing Array signal processing Costs Land mobile radio

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Experimental evaluation of DWT-Based Current Spike Comparator for Line Protection

Experimental Evaluation of DWT-Based Current Spike Comparato...

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IEEE PES Power systems Conference and Exposition, PSCE

作者： Hatem A. Darwish Abdel-maksoud I. Taalab A. H. Osman Naema M. Mansour O.P. Malik Electrical Engineering Department Faculty of Engineering Menoufia University Egypt Electrical and Computer Engineering Department University of Calgary Calgary AB Canada

The current spike comparator for line protection is based on the comparison of the sign of fault spikes extracted using discrete wavelet transform (DWT) at both line ends. In this paper, experimental investigation of the current spike comparator is presented. The scheme has been experimentally tested for various fault types covering wide range of fault location, fault resistance, fault inception angle, power swing and switching operations. A digital signal processing (DSP)-based setup is employed in the experimental phase of the study and results are compared with the simulation records. The results showed that, there is some constraints that affect the spike size especially in real-time such as inception angle, high impedance faults, mother wavelet, line model, and channel noise. This scheme is suitable for short transmission lines (R-L mutually coupled model). However, performance is further reduced for long transmission lines (distributed parameter model)

关键词： Discrete wavelet transforms Power system protection Global Positioning System Power system modeling Power transmission lines Mutual coupling Virtual reality Power system transients Frequency synchronization Fault currents

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Measurement-based performance evaluation of advanced MIMO transceiver designs

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EURASIP JOURNAL ON APPLIED signal processing 2005年第11期2005卷 1712-1724页

作者： Trautwein, U Schneider, C Thomä, R MEDAV GmbH D-91080 Uttenreuth Germany TeWiSoft GmbH D-98693 Ilmenau Germany Ilmenau Univ Technol Inst Commun & Measurement Engn D-98684 Ilmenau Germany

This paper describes the methodology and the results of performance investigations on a multiple-input multiple-output (MIMO) transceiver scheme for frequency-selective radio channels. The method relies on offline simulations and employs real-time MIMO channel sounder measurement data to ensure a realistic channel modeling. Thus it can be classified in between the performance evaluation using some predefined channel models and the evaluation of a prototype hardware in field experiments. New aspects for the simulation setup are discussed, which are frequently ignored when using simpler model-based evaluations. Example simulations are provided for an iterative ("turbo") MIMO equalizer concept. The dependency of the achievable bit error rate performance on the propagation characteristics and on the variation in some system design parameters is shown, whereas the antenna constellation is of particular concern for MIMO systems. Although in many of the considered constellations turbo MIMO equalization appears feasible in real field scenarios, there exist cases with poor performance as well, indicating that in practical applications link adaptation of the transmitter and receiver processing to the environment is necessary.

关键词： MIMO systems channel modeling channel sounding turbo equalization link-level simulations

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An evaluation of model-based software synthesis from simulink models for embedded video applications

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INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING 2005年第2期15卷 343-348页

作者： Doblander, A Gösseringer, D Rinner, B Graz Univ Technol Inst Tech Informat A-8010 Graz Austria ARC Seibersdorf Res Video & Secur Technol A-2444 Seibersdorf Austria

In next generation video surveillance systems there is a trend towards embedded solutions. Digital signal processors (DSP) are often used to provide the necessary computing power. The limited resources impose significant challenges for software development. Resource constraints must be met while facing increasing application complexity and pressing time-to-market demands. Recent advances in synthesis tools for Simulink suggest a high-level approach to algorithm implementation for embedded DSP systems. The model-based visual development process of Simulink facilitates simulation as well as synthesis of target specific code. In this work the modeling and code generation capabilities of Simulink are evaluated with respect to video analysis algorithms. Different models of a motion detection algorithm are used to synthesize code. The generated code targeted at a Texas Instruments TMS320C6416 DSP is compared to a hand-optimized reference. Experiments show that an ad hoc approach to synthesize complex image processing algorithms hardly yields optimal code for DSPs. However, several optimizations can be applied to improve performance.

关键词： model-based design automatic code generation embedded video surveillance

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A complete compiler approach to auto-parallelizing C programs for Multi-DSP systems

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IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED systems 2005年第3期16卷 234-245页

作者： Franke, B O'Boyle, MFP Univ Edinburgh ICSA Edinburgh EH9 3JZ Midlothian Scotland

Auto-parallelizing compilers for embedded applications have been unsuccessful due to the widespread use of pointer arithmetic and the complex memory model of multiple-address space digital signal processors (DSPs). This paper develops, for the first time, a complete auto-parallelization approach, which overcomes these issues. It first combines a pointer conversion technique with a new modulo elimination transformation for program recovery enabling later parallelization stages. Next, it integrates a novel data transformation technique that exposes the processor location of partitioned data. When this is combined with a new address resolution mechanism, it generates efficient programs that run on multiple address spaces without using message passing. Furthermore, as DSPs do not possess any data cache structure, an optimization is presented which transforms the program to both exploit remote data locality and local memory bandwidth. This parallelization approach is applied to the DSPstone and UTDSP benchmark suites, giving an average speedup of 3.78 on four Analog Devices TigerSHARC TS-101 processors.

关键词： parallel processors interprocessor communications real-time and embedded systems signal processing systems measurement evaluation modeling simulation of multiple-processor systems conversion from sequential to parallel forms restructuring reverse engineering and reengineering performance measures compilers arrays

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evaluation of advanced signal control systems with sensing technology by simulation 1

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3rd Annual Asian simulation Conference

作者： Nazmi, M Hanim, N Takaba, S Tokyo Univ Technol Grad Sch Engn Sch Syst Elect Hachioji Tokyo 1920982 Japan Tokyo Univ Technol Dept Comp Sci Dept Informat Networks Hachioji Tokyo 1920982 Japan

ISBN: (数字)9783540305859

ISBN: (纸本)3540244778

This paper describes a new data collection system for determining individual vehicle routes from images detector sequence. These sensing technologies are installed at the traffic signal to gain a microscopic flow from upstream intersection. From the investigation, the techniques for analyzing the images can be applied for calculation of the traffic information. The image sensors are set for microscopic detection via the direction of vehicles, and for every lane at specified perception range. Two cases study has been carried out to analyze the method. We try to solve the problem of signal control system for the FAST system and complex intersection. Using image sensor for (i) control traffic flow in FAST system, (h) manage the control system in complicated intersection, is highly proposed. Arena simulations are used to analysis the investigation data and monitoring the traffic signal control system performance.

关键词： Control systems

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Proceedings ELMAR-2005 47th International Symposium ELMAR-2005 focused on Multimedia systems and Applications

Proceedings ELMAR-2005 47th International Symposium ELMAR-20...

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Elmar 2005 - 47th International Symposium Electronics in Marine

The proceedings contain 95 papers. The topics discussed include: combining K-means and Semivariograms-based grid clustering;real-time colour segmentation and autofocus in retinal images;reconstruction of 3-D image from stereo pictures;content-based video recognition technique using a non linear metric;threshold procedures and image segmentation;improved signal reconstruction and return channel suppression in distributed video coding systems;modulus maximum image energy using maximum entropy;telecine calibration and image quality evaluation;digital cinema projectors;wavelet transform in image recognition;wavelet downsampling in image compression;dual detection of watermarks embedded in the DCT domain;remote control and measurement of temperature over the web;data encryption performance based on blowfish;and semantic based video data modeling.

关键词： Multimedia systems

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A simulation and exploration technology for multimedia-application-driven architectures

A simulation and exploration technology for multimedia-appli...

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作者： Barbieri, Ivano Bariani, Massimo Cabitto, Alberto Raggio, Marco Department of Biophysical and Electronic Engineering University of Genova Via Opera Pia 11 A 16146 Genova Italy SME Scalab Srl.

The increasing of computational power requirements for DSP and Multimedia application and the needs of easy-to-program development environment has driven recent programmable devices toward Very Long Instruction Word (VLIW) [1] architectures and Hw-Sw co-design environments [2]. VLIW architecture allows generating optimized machine code from high-level languages exploiting Instruction Level Parallelism (ILP) [3]. Furthermore, applications requirements and time to market constraints are growing dramatically moving functionalities toward System on Chip (SoC) direction. This paper presents VLIW-SIM, an Application-Driven Architecture-design approach based on Instruction Set simulation. VLIW architectures and Instruction Set simulation were chosen to fulfill multimedia domain requirements and to implement an efficient Hw-Sw co-design environment. The VLIW-SIM simulation technology is based on pipeline status modeling, simulation cache and simulation Oriented Hw description. An effective support for Hw-Sw co-design requires high simulation performance (in terms of Simulated Instruction per Second-SIPS), flexibility (the ability to represent a number of different architectures) and cycle accuracy. There is a strong trade-off between these features: cycle accurate or close to cycle accurate simulation have usually low performance [4, 5]. Good simulation performance can be obtained loosing the simulator flexibility. Moreover SoC simulation requires a further degree of flexibility in simulating different components (core, co-processors, memories, buses). The proposed approach is focused on interpretative (not compiled [6]) re-configurable Instruction Set Simulator (ISS) in order to support both application design and architecture exploration. VLIW-SIM main features are: efficient host resource allocation, Instruction Set and Architecture description Flexibility (Instruction Set Dynamic Generation and simulation Oriented Hardware Description), Step by step pipeline status trac

关键词： Multimedia systems

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Active radar seeker receiver signal model

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Xi Tong Gong Cheng Yu Dian Zi Ji Shu/systems Engineering and Electronics 2005年第11期27卷 1889-1892+1906页

作者： Liu, Jian-Cheng Wang, Xue-Song Li, Dun Xiao, Shun-Ping Wang, Guo-Yu School of Electronic Science and Engineering National Univ. of Defense Technology Changsha 410073 China

Radar seeker is a key part of the tactical guided missile of active homing type. It detects a target and guides a missile to fly at it, so its performance affects missile's efficiency greatly. Active radar seeker mostly adopts pulse Doppler monopulse radar system. So it is significant to research on the modeling and simulation of this kind of radar seeker. The classical simulation of radar seeker primarily model guidance control system without considering signal receiving and signal processing. Based on the simulation and evaluation problem of active radar target seeker in the condition of complicated ECM, modeling and dynamic simulation of pulsed Doppler radar seeker is studied. Then simulation is carried out and results verify its efficiency.

关键词： Jamming Missile Radar seeker signal model simulation

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