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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

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155 Mbit/s data transmission at 60 GHz using a 1/spl times/4 patch array antenna with variable optical delay lines

155 Mbit/s data transmission at 60 GHz using a 1/spl times/4...

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Microwave, MTT-S international symposium

作者： G. Grosskopf R. Eggemann d. Rohde M.S. Choi Heinrich-Hertz-Institut für Nachrichtentechnik Berlin GmbH Berlin Germany

155 Mbit/s data transmission at 60 GHz was carried out successfully with bit error rates below 10/sup -9/. The experimental transmission system included a 1/spl times/4 patch array antenna. It was fed by optically generated RF-signals and its beam was steered by tunable optical delay lines. Bit error rates below 10/sup -3/ could be maintained for azimutal angles over a range of 120 degrees. The antenna is part of an experimental radio-over-fiber system for proof-of-concept of optical beamforming to be applied in broadband mobile communication systems.

关键词： data communication Bit error rate Optical beams Broadband antennas Antenna arrays Transmitting antennas delay lines Mobile antennas Antenna accessories Array signal processing

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Multicarrier Modulation in Advanced Wireless Communication Systems

Multicarrier Modulation in Advanced Wireless Communication S...

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international symposium on Electronics in Marine (ELMAR)

作者： d. Nogulic M. Gadze A. Jankovic Mobile Networks Ericsson Nikola Tesla d.d. Zagreb Croatia

The selection of appropriate multiple access technology is the main issue in design and development of beyond 3G (B3G) wireless systems. This article considers orthogonal frequency-division multiplexing (OFdM) scheme as a key technique to implement in next-generation mobile systems. The introduction of OFdM multicarrier technique in new hybrid multiple access technologies should provide a solution for problems limiting current mobile systems, such as sensitivity to multipath conditions, poor bandwidth efficiency, interference and capacity issues, high signal processing complexity and inadequate performance of high-speed data transmission. The theoretical background, characteristics and practical applications of some of the most important multiple access combinations will be reviewed. Finally, the implementation of OFdM in existing single carrier 3G systems and coexistence will be shortly addressed in conclusion

关键词： Wireless communication OFdM modulation Appropriate technology Wireless sensor networks Frequency division multiplexing Limiting Bandwidth Interference Signal processing data communication

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Enhanced KLM Model for Single-Fibre Piezocomposite Transducers

Enhanced KLM Model for Single-Fibre Piezocomposite Transduce...

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IEEE symposium (IUS) Ultrasonics

作者： Martin Angerer Michael Zapf Sylvia Gebhardt Holger Neubert Nicole V. Ruiter Institute for Data Processing and Electronics Karlsruhe Institute of Technology (KIT) Eggenstein-Leopoldshafen Germany Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) Dresden Germany

ISBN: (数字)9781728154480

ISBN: (纸本)9781728154497

The requirements of our third generation 3d ultrasound computer tomography system (USCT) led to a transducer array design based on single-fibre piezocomposites. The used piezoelectric ceramic fibres exhibit a thickness to diameter ratio of 4/3. This ratio results in a proximity of the dominant axial and lateral vibration resonances. The standard Krimholtz-Leedom-Matthaei (KLM) model considers only one spatial dimension. This limits the validity of the modelled predictions for our application. By adding a coupled transmission line in series to the axial resonator, the standard model can be extended to take additional spatial dimensions into account. Using model parameters from literature resulted in a low model-to-measurement fit. To enhance the prediction accuracy, a brute-force optimisation over four model parameters was conducted. With the optimal parameter set, a fit of 90.3% could finally be achieved. The necessary model parameter changes were found reasonable for the piezocomposite design. With the presented model enhancement it is now possible to consider both dominant vibration modes of our transducers.

关键词： Vibrations Ultrasonic imaging Computational modeling Ultrasonic transducer arrays Tomography Predictive models Standards

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The GOMOS processing chain and products

The GOMOS processing chain and products

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： A. Popescu O. Fanton d'Andon J.L. Bertaux E. Kyrola A. Hauchecorne A. Mangin F. dalaudier G. Leppelmeier d. Fussen J. Langen ESA-ESTEC-ENVISAT Noordwijk Netherlands ACRI-ST Biot France Service d'Aeronomie Verrieres le Buisson France FMI Inc. Helsinki Finland IASB Brussels Belgium

ESA's ENVISAT in year 2000 and will measure ozone with unprecedented long term accuracy and vertical resolution. GOMOS observes stellar occultations, and determines ozone, NO/sub 2/, NO/sub 3/, aerosol, O/sub 2/, H/sub 2/O and possibly OClO concentrations from the ratio of two stellar spectra, one outside the atmosphere, one through the atmosphere. The first step of the processing, Level 1b, consists of various instrumental corrections to obtain the measured atmospheric spectral transmission as a function of altitude/geolocation. The second step (Level 2) consists of one spectral inversion for each line of sight (retrieval of integrated line densities of various constituents) and one vertical inversion for the whole occultation. The analysis of two fast photometers (1 kHz) data will produce a high resolution profile for the temperature profile. Higher data products will be constructed with the sequential assimilation of GOMOS data into a CTM model.

关键词： Atmospheric measurements Extraterrestrial measurements Instruments Atmosphere Absorption Photometry Wavelength measurement Atmospheric waves Space vehicles Motion measurement

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Enhancing Urban Mobile Communications with dynamic 3d Beam Tracking: A 2-Bit Phase-Quantized Adaptive RIS Approach

Enhancing Urban Mobile Communications with Dynamic 3D Beam T...

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IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Yufei Zhao Xiaoyan Ma Ziyue Wang Yile Liu Chau Yuen Yong Liang Guan School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (数字)9798350362244

ISBN: (纸本)9798350362251

The imperative to secure stable data transmission for mobile users within the heart of urban zones stands as a pivotal element in the evolution of future communication infrastructures. Utilizing the adaptable beamforming prowess of Reconfigurable Intelligent Surfaces (RISs) presents a viable strategy to aid mobile users in sustaining consistent beam tracking amidst the complex urban milieu. This study delves into the dynamic beamforming potential of RIS to facilitate real-time tracking and communication across convoluted wireless landscapes. In pursuit of refined spot beamforming capabilities under near-field scenarios, this work unveils an innovative 2bit RIS unit design approach, engineered to establish stable and adjustable phase shifts whilst minimizing amplitude loss. A tangible RIS experimental framework is devised, drawing from numerical analyses and comprehensive wave simulations. This framework enables each RIS unit to autonomously toggle between states, thereby not only governing cone beams but also materializing sophisticated structured beams, such as 3d spot beams, thus augmenting the versatility of communication designs. To augment the RIS’s beam tracking efficiency, an effective RIS management protocol alongside a spot beam scanning algorithm tailored for mobile users is introduced. Subsequent extensive simulations and empirical investigations, corroborate the prompt and adaptable beamforming proficiency of the proposed RIS prototype within demanding wireless contexts. The outcomes of this research significantly enrich the comprehension and application of RIS technology in the realm of forthcoming communication frameworks.

关键词： Wireless communication Adaptation models Solid modeling Three-dimensional displays Target tracking Array signal processing Heuristic algorithms Reconfigurable intelligent surfaces Real-time systems Communication system security

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On the role of raw data oversampling in signum coded SAR imaging

On the role of raw data oversampling in signum coded SAR ima...

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： V. Pascazio G. Schirinzi Istituto Universitario Navale I. T. T. O. E. M. Naples Italy IRECE-CNR Naples Italy DAEIIMI Universita di Cassino Cassino Frosinone Italy

Synthetic aperture radar (SAR) image formation requires a proper processing of the raw data, that consists essentially of a 2d space-variant convolution between the received signal (raw data) and the system point spread signal (PSS). due to the large amount of data to be processed, the received signal is quantized using 3-8 bits, properly coded and transmitted to the ground, where the image formation process is performed. An alternative processing technique is based on coding at only one bit the involved signals, so that only the information about the sign of the signals is preserved. This processing technique is based on the result that the image obtained by considering only the signum of the signals to be processed is approximately equal, but for a scaling factor, to the image obtained starting from the conventionally quantized signals. Also the image phase exhibits acceptable quality. The main advantages of this processing method are the drastic transmission data rate reduction. The discrepancies between the images obtained by processing conventionally quantized data and one bit coded data are mainly due to the aliasing effects between higher order harmonics generated by the SC operation, that is inherently nonlinear and generates harmonics of the input signal. By increasing the sampling frequency this effect can be reduced, so that the quality of obtained images can be further improved. This is coherent with theoretical results regarding the reconstruction of a band limited signal by its zero crossing: high quality reconstruction is possible as long as the phase is highly random and the sampling rate sufficiently high.

关键词： Radar polarimetry Signal processing Power harmonic filters Signal to noise ratio Synthetic aperture radar Signal generators Image sampling Frequency Image reconstruction Signal analysis

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Computational Electromagnetics for Mobile devices on Multiple Platforms

Computational Electromagnetics for Mobile Devices on Multipl...

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IEEE international symposium on Antennas and Propagation

作者： d. R. Browne S. C. Pomeroy J. A. Flint Sch. of Electron. Loughborough Univ. Loughborough UK

ISBN: (纸本)9781467353168

Mobile computing devices are ubiquitous and can now carry out computationally-intensive tasks in a timely fashion. This paper presents multi-platform, computational electromagnetics educational software for modern mobile platforms. Performance of the transmission Line Matrix (TLM) solver has been increased using a Single Instruction, Multiple data (SIMd) processing strategy applicable to the majority of available platforms. Included is discussion of the SIMd strategy, performance benchmarking results and user uptake statistics.

关键词： Performance evaluation Tablet computers Registers Smart phones Clocks Hardware Benchmark testing

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Time-domain techniques for reconstructing lossy layered media from one-sided scattering

Time-domain techniques for reconstructing lossy layered medi...

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Antennas and Propagation Society international symposium

作者： J.L. Frolik Department of Electrical and Computer Engineering Tennessee Technological University Cookeville TN USA

The electromagnetic (EM) inverse scattering problem under consideration is to compute the parameter profile (i.e., permittivity, attenuation constant, thickness) of a layered dielectric from scattering data (i.e., reflection response to an impulsive plane wave). It is well known that EM plane wave propagation through a dielectric varying in only one dimension can be modeled as voltage or current propagation through a 1-d transmission line. Furthermore, a media consisting of a stack of homogeneous but parametrically different dielectric layers can be modeled as a discrete transmission line. Here, we model the lossy layered dielectric as an asymmetric discrete lattice filter and employ digital signal processing (dSP) techniques to the reconstruction of the media. Often, it is not practical or even possible to measure the two-sided scattering of a media (e.g., soils, forest canopies, walls). This is the problem under consideration in this paper. We present a discussion and comparison of two algorithms for reconstructing lossy layered media from one-sided time-domain plane wave impulse reflection responses. Unique features of these algorithms are that they: (1) have their origins in dSP theory; (2) are fast algorithms that have been modified to solve both the forward and inverse scattering problem; (3) solve the scattering problems exactly, including accounting for multiple reflections; and (4) solve the lossy media problem using only one-sided impulse reflection response data. In addition, the algorithm stability and time sampling constraints are introduced.

关键词： Time domain analysis Nonhomogeneous media Electromagnetic scattering Signal processing algorithms digital signal processing Reflection Inverse problems transmission line theory dielectric losses Permittivity

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A Research on Emotion detection System

A Research on Emotion Detection System

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Conference on Modeling of Systems Circuits and devices (MOS-AK India)

作者： d Anitta Boorle Hemanth N Chethan A Nishath Anjum G. Venkata Ravi Teja Anu Joy Department Of ECE MVJ College Of Engineering Bangalore India

ISBN: (数字)9798350395556

ISBN: (纸本)9798350395563

Medical fields rely heavily on signal processing for tasks like audio signal processing from patients, monitoring vital signs, and image analysis (such as MRI or CT scans). When used in the context of your work, SER can be helpful for keeping an eye on patients' emotional states. Comprehending the emotional condition of a patient can be crucial in delivering suitable care and assistance, particularly in domains such as mental health. Signal processing is used in radio transmission and telecommunications to improve overall communication, lower interference, and improve the quality of audio signals. This can directly affect how clear communication is, which makes it crucial for things like mobile phones and radio broadcasts, among other things. Like in many other domains, machine learning is crucial to SER research. Pitch, tone, and speech patterns are examples of emotional cues that can be identified by machine learning models that have been trained to analyze audio signals. Real-time applications of these models can be used to interpret and classify speech-expressed emotions. The goal of the developing field of speech recognition and emotion extraction from speech signals is called SER. As you pointed out, humans can infer emotions from voice modulation intuitively, and ongoing research attempts to enable machines to do the same. Numerous industries, including customer service, healthcare, and even personalized AI systems, may benefit from this technology. For SER to function, realtime audio visualization is essential. It entails converting audio data into visual representations that are useful for speech analysis of emotional cues. Spectrophotomograms and other graphical depictions of audio characteristics that machine learning models can use to categorize emotions may be included in these visualizations. The potential applications in automotive systems are also highlighted in this work. SER has the potential to enhance user experience, safety, and customer interac

关键词： visualization Time-frequency analysis Resonant frequency data visualization Machine learning Medical services Interference

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Ph.d. Project Investigating Chiplet Interfaces for Efficient Near-Sensor Computing in Visual On-device Intelligence

Ph.D. Project Investigating Chiplet Interfaces for Efficient...

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Annual IEEE symposium on Field-Programmable Custom Computing Machines (FCCM)

作者： Peter Mbua Christophe Bobda University of Florida Gainesville Florida

ISBN: (数字)9798350372434

ISBN: (纸本)9798350372441

The ever-growing demand for intelligent devices capable of visual processing in real time at the edge requires a paradigm shift in computing architectures. Near-sensor computing offers a promising solution by bringing computation closer to the data source, enabling faster response times and reduced power consumption. However, traditional monolithic chip design struggles to meet the efficiency and flexibility demands of near- sensor visual intelligence tasks. This Ph.d. project investigates the transformative potential of chiplet interfaces in revolutionizing near-sensor computing for on-device visual intelligence. Chiplet technology offers a modular approach that enables the integration of heterogeneous cores and specialized hardware accelerators into a single package. Using this modularity, the project aims to achieve the following key objectives: (1) design and explore novel chiplet interface architectures, (2) hardware-software co-design for chiplet-based near-sensor processing targeting visual data, (3) power efficiency exploration and finally real-world application validation. The successful completion of this Ph.d. project is expected to yield significant contributions to the field of near- sensor computing. With expectations of proposing some novel chiplet interfaces for efficient visual on-device intelligence, the project has the potential to pave the way for a new generation of intelligent devices capable of real-time visual processing at the edge, with minimal reliance on cloud-based resources.

关键词： visualization Cloud computing Power demand Chiplets Soft sensors Computer architecture Real-time systems

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