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ADAPTIVE EQUALIZATION TECHNIQUES FOR ACOUSTIC TELEMETRY CHANNELS

IEEE JOURNAL OF OCEANIC engineering 1991年第1期16卷 21-31页

作者： PROAKIS, JG Communications and Digital Signal Processing Research Center Department of Electrical and Computer Engineering Northeastern University Boston MA USA

A tutorial review of adaptive equalization techniques for combating intersymbol interference in high-speed digital communications over time-dispersive channels is given. Various equalizer structures and the associated adaptive algorithms, including both fractionally spaced and symbol-spaced equalizers, are presented. Also considered is the application of adaptive equalization techniques to underwater acoustic telemetry channels.

关键词： Adaptive equalizers Telemetry Resonance light scattering signal processing algorithms Intersymbol interference Least squares approximation Finite impulse response filter Adaptive algorithm Underwater acoustics Transversal filters

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CODED MODULATION FOR DIGITAL-communications OVER RAYLEIGH FADING CHANNELS

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IEEE JOURNAL OF OCEANIC engineering 1991年第1期16卷 66-73页

作者： PROAKIS, JG Communications and Digital Signal Processing (CDSP) Department of Electrical and Computer Engineering Northeastern University Boston MA USA

A signal-design method based on the integration of coding and modulation, noncoherent demodulation, and soft-decision decoding is described. The integrated coding/modulation approach provides robust signal designs for digital communications over rapidly fading channels that may be encountered in medium- and long-range, horizontal-path acoustic telemetry. The structure of the corresponding demodulator/decoder is described and the error rate performance of the resulting system is evaluated for Rayleigh fading signal statistics. Of special interest is the use of concatenated coding for forming codes of large distance, and an example is given using dual-k codes. The performance gains that are achieved by the integrated coded modulation approach relative to conventional uncoded signal designs are also illustrated.

关键词： Digital modulation Modulation coding Digital communication Rayleigh channels Demodulation Decoding signal design Error analysis Robustness Fading

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NONPARAMETRIC DOMINANT POINT DETECTION

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PATTERN RECOGNITION 1991年第9期24卷 849-862页

作者： ANSARI, N HUANG, KW Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights Newark NJ 07102 U.S.A.

A new method for detecting dominant points is presented. It does not require any input parameter, and the dominant points obtained by this method remain relatively the same even when the object curve is scaled or rotated. In this method, for each boundary point, a support region is assigned to the point based on its local properties. Each point is then smoothed by a Gaussian filter with a width proportional to its determined support region. A significance measure for each point is then computed. Dominant points are finally obtained through nonmaximum suppression. Unlike other dominant point detection algorithms which are sensitive to scaling and rotation of the object curve, the new method will overcome this difficulty. Furthermore, it is robust in the presence of noise. The proposed new method is compared to the Teh-Chin algorithm (see C. Teh and R. T. Chin, IEEE Trans. Pattern Anal. Mach. Intell. 11, 859-872 (1989)) in terms of the computational complexity, the approximation errors and the number of detected dominant points of an object curve.

关键词： DOMINANT POINTS GAUSSIAN SMOOTHING SUPPORT REGION CURVATURE

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CONSTRAINED NOTCH FILTERING OF NONUNIFORMLY SPACED SAMPLES FOR ENHANCEMENT OF AN ARBITRARY signal CORRUPTED BY A STRONG FM INTERFERENCE

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IEEE TRANSACTIONS ON signal processing 1991年第10期39卷 2359-2363页

作者： WULICH, D PLOTKIN, EI SWAMY, MNS Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beersheba Israel

The novelty of the proposed method is based on exploring the concept of constrained notch filtering (CNF) as applied to any given arbitrary signal with time varying parameters. First, it is shown that any signal with a constant envelope such as FM may be transformed to a discrete sinusoidal one by applying nonuniform sampling strategy. Second, a signal buried under a strong FM interference is retrieved by applying CNF in the transformed time domain. The main assumption made is that there exists an auxiliary input which provides information about the instantaneous frequency of the interference.

关键词： Filtering Interference constraints Frequency Equations Adaptive filters signal processing Digital signal processing Transform coding Discrete transforms Image coding

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BOUNDARY IMPLICATIONS FOR FREQUENCY-RESPONSE OF INTERVAL FIR AND IIR FILTERS

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IEEE TRANSACTIONS ON signal processing 1991年第10期39卷 2167-2173页

作者： BOSE, NK KIM, KD Department of Electrical and Computer Engineering Spatial and Temporal Signal Processing Center Pennsylvania State University University Park PA USA

It is shown that vertex implication results in parameter space apply to interval trigonometric polynomials. Subsequently, it is shown that the frequency responses of both interval FIR and IIR filters are bounded by the frequency responses of certain extreme filters. The results apply directly in the evaluation of properties of designed filters, especially because it is more realistic to bound the filter coefficients from above and below instead of determining those with infinite precision because of finite arithemetic effects. Illustrative examples are provided to show how the extreme filters might be easily derived in any specific interval FIR or IIR filter design problem.

关键词： Frequency response Finite impulse response filter IIR filters Array signal processing Sensor arrays Robust stability Quantization Sampling methods Polynomials Arithmetic

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PARALLEL processing FOR BIO-MEDICAL signal-processing - HIGHER-ORDER SPECTRAL-ANALYSIS - AN APPLICATION

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computer 1991年第3期24卷 33-43页

作者： MANOLAKOS, ES STELLAKIS, HM BROOKS, DH Communications and DigitalSignal Processing Center for Research and Graduate Studies Electrical and Computer Engineering Department Northeastern University Boston MA USA

The transition from uniprocessor to multiprocessor architectures is mandated to achieve real-time performance in computer-based medical systems for biomedical signal and image processing.

关键词： Parallel processing Biomedical signal processing signal processing Biomedical computing Biomedical imaging Spectral analysis signal analysis Digital signal processing signal processing algorithms High performance computing

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EFFICIENT REALIZATION STRUCTURE OF THE A-PRIORI LATTICE-LADDER RECURSIVE LEAST-SQUARES ALGORITHM

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IEEE TRANSACTIONS ON signal processing 1991年第4期39卷 992-996页

作者： PETROPULU, AP NIKIAS, CL PROAKIS, JG Communication and Digital Signal Processing Center for Research and Graduate Studies Department of Electrical and Computer Engineering Northeastern University Boston MA USA

This correspondence introduces an efficient pipelined realization structure of the a priori lattice-ladder least squares multi-channel algorithm. The structure is shown to exihibit great modularity and high parallelism. The new architecture is evaluated for cost and data throughput delay assuming pipelined operations. It is demonstrated that the throughput rate of the structure is O(1) and the cost O(l2N) where l is the number of channels and N the order of the filter.

关键词： Least squares methods signal processing algorithms Costs Throughput Delay Parallel processing Filters Array signal processing Roundoff errors Very large scale integration

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Priority-based dynamic access policies to WAN from LAN/MAN 16

Priority-based dynamic access policies to WAN from LAN/MAN

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16th Conference on Local computer Networks, LCN 1991

作者： Jeon, Yong-Hee Viniotis, Ioannis Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695 United States

ISBN: (纸本)0818623705

We consider the integration problem of LAN/MAN traffic to WAN by ATM/SONET multiplexing. We propose separate buffers for voice and data to efficiently control the throughput of each traffic type. Transmission bandwidth is dynamically and adaptively shared between voice and data to guarantee Grade of Service (GOS) requirements for each traffic type. We propose two algorithms for access policies;the (N1, N2) scheme and its adaptive variation. Our algorithms do not require the knowledge of arrival statistics. In the first scheme, we can play with the tradeoff between delay and cell loss probability of each traffic type. In the second scheme, for most of the time and under normal network conditions, voice traffic has higher priority. Data traffic has higher priority when the number of data cells queued reaches a certain threshold. We show how the network performance is affected by several system parameters. © 1991 IEEE.

关键词： Local area networks

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USE OF BLIND EQUALIZATION FOR TELETEXT BROADCAST SYSTEMS

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IEEE TRANSACTIONS ON BROADCASTING 1991年第2期37卷 44-54页

作者： KARAOGUZ, J ARDALAN, SH Dept. of Electr. & Comput. Eng. North Carolina State Univ. Raleigh NC USA Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Severe inter-symbol-interference (ISI) due to multipath fading broadcast channels requires the equalization of digital teletext signals for reliable operation. Until now, the equalization of the teletext signals has been achieved by conventional adaptive equalization. However, these equalizers need a training signal which is sent during the potential data transmission time. Also, conventional adaptive equalizers are very poor in tracking changing channel characteristics which are often encountered in fading multipath environments. This paper suggests the use of blind adaptive equalization, which removes the mentioned drawbacks of the conventional adaptive equalization. The paper also deals with the compatibility of the proposed blind equalizer with the existing teletext system standards and cost-effectiveness issues. computer simulations demonstrate substantial improvements in the bit-error-rates for the received teletext data in a multipath transmission medium.

关键词： Blind equalizers Teletext Quadrature phase shift keying TV broadcasting Delay Phase modulation Data communication Bandwidth Circuit simulation Phase shift keying

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Cascade implementation of CANFs in spectral analysis of short data auditory evoked brainstem responses

Cascade implementation of CANFs in spectral analysis of shor...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： R. Agarwal E.I. Plotkin M.N.S. Swamy Center of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Auditory evoked brainstem response (ABR) can be modeled as two closely spaced sinusoids immersed in noise. Conventional methods on the FFT are often not useful in the spectral estimation of short-duration ABRs. The authors propose the use of constrained adaptive notch filters (CANFs) implemented as a cascade of second-order sections, and discuss two special configurations based on CANF combined with a constrained notch filter (CNF) with fixed parameters. The problem associated with the convergence of the direct-form implementation of higher-order CANFs to a local minimum is also addressed. The methods proposed are shown to provide reliable spectral estimation and enhancement of the real data ABRs.< >

关键词： Spectral analysis Frequency Narrowband signal processing Convergence Brain modeling Adaptive filters Electroencephalography Deafness Loss measurement

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