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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms"

共 3500 条记录，以下是3261-3270 订阅

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Payload digital processor hardware demonstrator for satellite communications systems

Payload digital processor hardware demonstrator for satellit...

引用

International conference on Communication Technology (ICCT)

作者： C.K. Leong R.P. Mathur A.D. Craig Marconi Space Stevenage UK

Satellite communication payloads for mobile communications systems require advanced digital signal processing and narrowband beamforming techniques to meet the traffic routing flexibility. The paper describes the key functions of a narrowband digital beamforming processor and summarises key aspects of development work performed at Marconi Space to demonstrate the feasibility of such a flight processor. This includes relevant ASIC designs to validate key processing algorithms, multichip modules (MCMs) to demonstrate high density packaging techniques and a flight model demonstrator to demonstrate a representative narrowband processor using the ASICs and MCMs.

关键词： Payloads Hardware Narrowband Array signal processing Satellite communication Mobile communication Digital signal processing Routing Application specific integrated circuits Algorithm design and analysis

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Implementation of a European paging system receiver using CORDIC algorithm

Implementation of a European paging system receiver using CO...

引用

European signal processing conference (EUSIPCO)

作者： Jarkko Vuori Jorma Skyttä Laboratory of Signal Processing and Computer Technology Helsinki University of Technology Otakaari 5A FIN-02150 ESPOO Finland

ERMES is a new European paging standard. The data transmission speed is higher than in older systems, e. g. POCSAG, and advanced new features are implemented including intelligent battery saving operation and country roaming. The higher speed is achieved using the more elaborate modulation method 4-PAM/FM which makes the demodulator implementation much harder than in older 2-FSK based paging systems. The objective of this paper is to propose a novel ERMES signal demodulator structure utilising a complex digital phase-locked loop which is implemented using the CORDIC algorithm. Phase-locked loop demodulators have inherently better performance than the normally used discriminator type detectors. Implementation of those phase-locked loop structures using the CORDIC algorithm makes VLSI realizations very feasible.

关键词： Frequency shift keying Demodulation Receivers Phase locked loops Mathematical model Filtering algorithms Europe

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The impact of lossy image compression on automatic target recognition performance

The impact of lossy image compression on automatic target re...

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OCEANS

作者： F.B. Shin D.H. Kil G.J. Dobeck Advanced Concepts and Development Lockheed Martin-Arizona Litchfield Park AZ USA Coastal Systems Station Dahlgren Division Naval Surface Warfare Center Panama FL USA

In distributed underwater signal processing for area surveillance and sanitization during regional conflicts, it is often necessary to transmit raw imagery data to a remote processing station for detection-report confirmation and more sophisticated automatic target recognition (ATR) processing. Because of the limited bandwidth available for wireless transmission, image compression is of paramount importance. Furthermore, it is equally crucial that image coding algorithms be evaluated according to some meaningful criteria. Instead of assessing the performance of image compression algorithms in terms of peak signal-to-noise ratio (PSNR) or normalized mean-squared error (NMSE), we resort to a more meaningful performance metric that reflects human and operational factors-ATR performance. We develop a novel image compression algorithm that achieves the minimal information state by a combination of subimage-specific transformation, principal component analysis, and vector quantization (VQ). We quantify the performance of image coding by extracting key parameters or features from the original and reconstructed images and by comparing the ATR performances using separate test sets that contain both mines and mine-like clutter. We achieve a compression ratio of up to 57:1 with minimal sacrifice in P/sub D/ and P/sub FA/.

关键词： Image coding signal processing algorithms PSNR signal processing Surveillance Underwater tracking Target recognition Bandwidth Measurement Humans

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Feature-based multisensor fusion and performance quantification using sufficient statistics

Feature-based multisensor fusion and performance quantificat...

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OCEANS

作者： D.H. Kil F.B. Shin Advanced Concepts & Development Lockheed Martin-Arizona Litchfield Park AZ USA

Synergistic use of multiple-sensor data for improved situational awareness has been of great interest in distributed signal processing. The key factor in multisensor fusion (MSF) deals with accountability and information extraction. Accountability refers to the level of performance improvement attributable to each sensor. That is, in order for us to make a judicious decision on the final sensor configuration, performance ambiguity must be minimized. Furthermore, MSF algorithms must be able to extract all the useful information from raw sensor data. In short, we need to develop a meaningful metric that measures the extent to which the MSF performance approaches the theoretical upper limit similar in concept to the Cramer-Rao bounds (CRB) in parameter estimation. In this paper, we develop an interesting MSF algorithm and introduce a meaningful metric to quantify the degree of information loss associated with each sensor as well as the entire suite of sensors. We illustrate the utility of our algorithm with one insightful example.

关键词： Statistics Data mining Sensor phenomena and characterization signal processing algorithms Pattern recognition Robustness Feature extraction signal processing Parameter estimation signal to noise ratio

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A fast frequency domain algorithm for decoding quadrature Doppler signals

A fast frequency domain algorithm for decoding quadrature Do...

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Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： N. Aydin D.H. Evans Faculty of Engineering EE Department Gebze Institute of Advanced Technology Gebze Turkey Division of Medical Physics Faculty of Medicine University of Leicester UK

A fast frequency domain method for quadrature-to-directional format conversion of Doppler ultrasound signals is described. The algorithm requires only one complex FFT and one inverse FFT. Since the technique relies on the manipulation of phase information in the frequency domain after the complex FFT, it is named the Spectral Translocation Method (STM). The theoretical description is verified by simulation and practical implementations. The algorithm has been implemented in real-time using a commercially available digital signal processor board. Results show that more than 50 dB channel separation is achievable and widespread use of DSP chips makes this method attractive.

关键词： Frequency domain analysis Decoding signal processing algorithms Fourier transforms signal processing Ultrasonic imaging Audio tapes Biomedical engineering Physics Digital signal processors

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Influence of the handoff process on the channel holding time distribution for cellular systems

Influence of the handoff process on the channel holding time...

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IEEE International conference on Personal Wireless Communication

作者： D. Lara-Rodriguez Electrical Engineering Department Center for Resenrcli and Advanced Studies Mexicali Mexico

Traffic capacity improvement is a strong necessity of cellular systems. One of the main techniques to increase capacity is the utilization of microcells. However, as cells are reduced, handoff rates are increased. In this paper the influence of the handoff process in the channel holding time is studied. The channel holding time is defined as the time duration between the instant that a channel is occupied by a call and the time it is released by either the completion of the call or a handoff. It is shown by simulation that the channel holding time distribution can be fitted by an exponential distribution for signal strength based handoff algorithms.

关键词： Exponential distribution Traffic control Analytical models signal processing Fading Testing Telephony Computational modeling

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Bi-Directional Object-Based Coding in Video Compression at Very Low Bitrate

Bi-Directional Object-Based Coding in Video Compression at V...

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1996 3rd International conference on signal processing(ICSP’96)

作者： Chung-Tao Chu Dimitris Anastassiou Shih-Fu Chang Image and Advanced Television Laboratory Department of Electrical Engineering Columbia University New York N.Y.10027 USA

In this paper,an algorithmic architecture of video compression at very low bitrate is *** architecture incorporates block-based as well as object-based coding algorithms and manages them in a cooperative way in which different algorithms are applied to different image frames iteratively:I and P frames are coded by block-based algorithm and B frames are coded by bi-directional object-based *** extra degree of freedom in video coding is introduced in order to achieve higher compression ratios while maintaining good visual *** this paper,we emphasize on the details of the object-based algorithm which is based on the source model of rigid 2D-objects with 3-D *** are done for MPEG-4 Class A/B test sequences which contain low to medium spatial detail and low amount of movement but do not restrict to headndhoulder *** results are encouraging in that the coder provides higher image quality with satisfactory motion effect.

关键词： Object image frame Bi-Directional Object-Based Coding in Video Compression at Very Low Bitrate

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RLS algorithms for adaptive AR spectrum analysis based on multi-band decomposition of the linear prediction error

RLS algorithms for adaptive AR spectrum analysis based on mu...

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IEEE Region 10 International conference TENCON

作者： F.G.V. Resende K. Tokuda M. Kaneko A. Nishihara Dept. of Phys. Electron. Tokyo Inst. of Technol. Japan Department of Computer Science Nagoya Institute of Technology Japan School of information Science Japan Advanced Institute of Science and Technology Japan Department of physical Electronics Tokyo Institute of Technology Japan

A structure for adaptive AR spectral estimation based on multi-band decomposition of the linear prediction error is analyzed and two RLS algorithms to solve the related adaptive filtering problem are derived. The presented structure gives rise to spectral estimates that represent the true underlying spectrum with better fidelity than conventional LS methods by allowing an arbitrary trade-off between variance of spectral estimates and tracking ability of the estimator along the frequency domain. The linear prediction error is decomposed through a power complementary filter bank and components of each band are analyzed by different window lengths, allowing long windows to track slowly varying signals and short windows to observe fastly varying components. The correlation matrix of the input signal is shown to satisfy both time-update and order-update properties for rectangular windowing functions, and an RLS algorithm based on each property is presented. Also, simulations comparing the performance of conventional and the proposed multi-band LS methods are depicted and discussed.

关键词： Resonance light scattering Algorithm design and analysis Frequency estimation Error analysis Filtering algorithms Adaptive filters Frequency domain analysis Filter bank signal analysis Matrix decomposition

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Fuzzy logic control of a positioning table with DSP real-time implementation

Fuzzy logic control of a positioning table with DSP real-tim...

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IEEE conference on Control Technology and Applications (CCTA)

作者： Mingheng Wang Y. Chen Department of IElectrical Engineering Purdue University Indianapolis Indianapolis IN USA

Recently numerous advanced control techniques have been developed for motion control of electromechanical systems containing unknown parameters and uncertainties such as variations in payloads and unmodeled friction. Due to the limitation of sampling rates in low-cost, general-purpose microprocessors, it is difficult to implement those advanced algorithms in real-time for industrial applications. This is particularly true for high-speed and high precision control of various motion devices. In this paper we develop a rule-based fuzzy logic controller (FLC) for trajectory tracking control of an x-y axis positioning table. Using a DSP-based real-time control testbed, we were able to perform experiments with different sampling frequencies, motion speeds, and payloads. The effects of these parameters on the control performance are examined. The control performance of the FLC system proposed here is compared experimentally with that of a conventional PI control system. The results demonstrate the effectiveness of the proposed control system, especially for high-speed and high precision control of the x-y table with parameter variations.

关键词： Fuzzy logic Digital signal processing Motion control Control systems Payloads Sampling methods Electromechanical systems Uncertainty Friction Microprocessors

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Design and implementation of all-digital receivers for mobile communications

Design and implementation of all-digital receivers for mobil...

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IEEE conference on Vehicular Technology (VTC)

作者： R. Subramanian M. Barberis F. Gerbig B. Ghosh Synopsys Inc. Mountain View CA USA

The ability to turn advanced digital receiver concepts into silicon VLSI is fast becoming the key factor in competing successfully to realize commercial mobile communication systems. Behavioral synthesis is central to the next-generation of high-level VLSI design automation tools that allow designing at the algorithm level and rapid exploration of the VLSI architecture space. We demonstrate how to leverage behavioral synthesis technology in the design of digital transceivers. We propose and demonstrate a new DSP system design methodology where digital communications engineers can interactively explore detection and estimation algorithms, architectures, and their IC implementation. We demonstrate how the designer can explore algorithms and architectures using three examples from portable and mobile communication modem applications: an MFSK receiver for paging applications, a receiver front-end channel filter for a wideband modem, and a Viterbi decoder used for trellis-coded modulation. Using the methodology, we demonstrate how system designers can exercise control over algorithm parameters as well as architectural parameters such as hardware area, speed, and latency. This allows algorithm designers to quickly explore different VLSI architectures that execute the same algorithm.

关键词： Very large scale integration Algorithm design and analysis Mobile communication Space technology Modems Silicon Design automation Transceivers Digital signal processing Digital communication

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