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Statistical Signal and Array Processing, 2000. Proceedings of the Tenth IEEE Workshop on

Date 16-16 Aug. 2000

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  • Proceedings Of The Tenth IEEE Workshop On Statistical Signal And Array Processing [front matter]

    Publication Year: 2000, Page(s):0_1 - ix
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    Freely Available from IEEE
  • Author index

    Publication Year: 2000, Page(s):737 - 739
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    Freely Available from IEEE
  • Taylor series adaptive processing

    Publication Year: 2000, Page(s):234 - 238
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Many signal processing applications require estimating and tracking a quantity that is inherently nonstationary. Such quantities may be matrices (e.g., a covariance matrix or an image), vectors (e.g., a weight vector or an eigenvector), or scalars. This paper considers the use of Taylor series expansions to enhance tracking. The potential benefits of this approach include: (1) a reduction in compu... View full abstract»

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  • Channel order and RMS delay spread estimation for AC power line communications

    Publication Year: 2000, Page(s):229 - 233
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    AC power lines have been considered as a convenient and low-cost medium for intra-building automation systems. We investigate the problem of estimating the channel order and root mean squared (RMS) delay spread associated with the power lines, which are channel parameters that provide important information for determining the data transmission rate and designing appropriate equalization techniques... View full abstract»

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  • Consistent estimation of signal parameters in non-stationary noise

    Publication Year: 2000, Page(s):225 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    This paper addresses the problem of estimating the parameters of a deterministic signal in non-stationary, white, Gaussian noise. It is proposed to model the time-varying white Gaussian noise with an unknown deterministic variance sequence that changes every sample. While making relatively few assumptions on the non-stationarity of the noise, this type of modeling gives rise to different difficult... View full abstract»

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  • A novel modulation method for secure digital communications

    Publication Year: 2000, Page(s):650 - 654
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    We present a new digital modulation technique that introduces covertness in digital communications. The basic principle is to transmit realizations of a stochastic process in such a manner that the transmitted waveform appears noise-like. In this paper, we have chosen to express the transmitted waveform in a subspace formalism. This allows for an elegant geometrical interpretation of the waveform,... View full abstract»

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  • An introduction to synthetic aperture sonar

    Publication Year: 2000, Page(s):717 - 721
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    DTI has demonstrated that synthetic aperture sonar (SAS) can provide orders of magnitude improvement in cross-range resolution when compared to conventional sonar beamforming. Like synthetic aperture radar (SAR), SAS processing requires coherence over multiple measurements, but has long been impractical due to the nature of the ocean environment. We have extended SAR processing ideas to accommodat... View full abstract»

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  • An efficient algorithm for Gaussian-based signal decomposition

    Publication Year: 2000, Page(s):221 - 224
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Parameter estimation of each atom in the adaptive Gaussian basis representation (AGR) is a key problem determining signal decomposition results, which requires an effective parameter estimation algorithm. An efficient algorithm is proposed to estimate the time-frequency atoms in AGR. Compared with the algorithm presented in AGR, the parameter estimation is more adaptive, and the estimation accurac... View full abstract»

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  • Harmonic analysis associated with spatio-temporal transformations

    Publication Year: 2000, Page(s):136 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    The paper presents new developments in harmonic analysis associated with the motion transformations embedded in digital signals. In this context, harmonic analysis provides motion analysis with a complete theoretical construction of perfectly matching concepts and a related toolbox leading to fast algorithms. This theory can be built from only two assumptions: an associative structure for the loca... View full abstract»

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  • Global convergence of a single-axis constant modulus algorithm

    Publication Year: 2000, Page(s):645 - 649
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    We propose a modification to the constant modulus criterion for real valued sources processed with a complex valued receiver. Our modification is called single-axis constant modulus criterion (SA-CM) because it operates solely on the real component of the complex equalizer output. We show that under idealized conditions, a finite length, baud-spaced, complex valued equalizer minimizing the SA-CM c... View full abstract»

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  • Power spectral density analysis of randomly switched pulse width modulation for DC/AC converters

    Publication Year: 2000, Page(s):373 - 377
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper presents a detailed spectral analysis of the random switching frequency PWM technique for control of three-phase inverters. A number of novel results are reported including criteria for the existence of discrete harmonics in the output voltage waveforms, exact expressions for the power carried by these harmonics and an approximate but accurate formula for the continuous density. Further... View full abstract»

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  • New criteria for blind equalization of M-PSK signals

    Publication Year: 2000, Page(s):692 - 696
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Most digitally modulated signals can be depicted by a signal space diagram. Such a signal constellation often shows certain properties. M-PSK modulated signals uniformly lie on a circle. To equalize this class of signals, the constant modulus algorithm (CMA) is very efficient due to the signals' constant modulus property. Its criterion penalizes deviations in the amplitude of equalized signals fro... View full abstract»

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  • The numerical spread as a measure of non-stationarity: boundary effects in the numerical expected ambiguity function

    Publication Year: 2000, Page(s):252 - 256
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Establishing measures for local stationarity is an open problem in the field of time-frequency analysis. One promising theoretical measure, known as the spread, provides a means for quantifying potential correlation between signal elements. In previous papers we investigated the issue of implementing such a measure for discrete signals. The numerical spread was introduced as a means of applying an... View full abstract»

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  • A hierarchical algorithm for nearfield acoustic imaging

    Publication Year: 2000, Page(s):712 - 716
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    This paper presents a computationally efficient hierarchical nearfield imaging algorithm using a delay and sum beamformer with a random array via pulse-echo techniques. In the conventional imaging of nearfield sources, signals from multiple sensors are delayed and summed to focus at points in the imaging volume. However, the computational burden of implementing the conventional algorithm for array... View full abstract»

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  • On super-exponential algorithm, constant modulus algorithm and inverse filter criteria for blind equalization

    Publication Year: 2000, Page(s):216 - 220
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The super-exponential algorithm (SEA), constant modulus algorithm (CMA) and inverse filter criteria (IFC) using higher-order statistics have been widely used for blind equalization. Chi et al., (2000) have reported that SEA and IFC are equivalent under certain conditions. We further prove that SEA, IFC and CMA are equivalent under certain conditions, and their convergence speed and computational l... View full abstract»

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  • Stochastic algorithms for marginal MAP retrieval of sinusoids in non-Gaussian noise

    Publication Year: 2000, Page(s):131 - 135
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    In this paper we propose a method to estimate the frequencies of sinusoids embedded in non-Gaussian noise. We model the noise using mixtures of Gaussians and propose two original, efficient algorithms that allow for the marginal maximum a posteriori (MAP) estimation of the sinusoid parameters to be estimated. Outline of the proof of convergence of the algorithms is also given and simulation result... View full abstract»

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  • Demodulation of amplitude modulated signals in the presence of multipath

    Publication Year: 2000, Page(s):33 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Signals modulated by M-ary pulse amplitude modulation (PAM) or M-ary quadrature amplitude modulation (QAM) have a certain structured constellation. When the communication channel introduces intersymbol interference (ISI) at the receiver end, demodulation of such signals can be performed by constant modulus algorithm (CMA) based equalizers to cancel the interference. However, characteristics of mod... View full abstract»

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  • A batch subspace ICA algorithm

    Publication Year: 2000, Page(s):63 - 67
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    For the blind source separation (BSS) problem (or independent component analysis (ICA)), it has been shown that in many situations adaptive subspace algorithms are very slow and need important computation efforts. In a previous publication, we proposed a modified subspace algorithm for stationary signals. But that algorithm was limited to stationary signals and its convergence was not fast enough.... View full abstract»

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  • Multiwindow bispectral estimation

    Publication Year: 2000, Page(s):640 - 644
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The bispectral density provides crucial information about non-Gaussian and/or non-linear properties of stochastic processes. In practice however, bispectral estimators are prone to be inaccurate and statistically inconsistent. In this paper we have discussed the statistical properties of non-parametric direct bispectral estimators. Several multitaper based bispectral estimators are presented, incl... View full abstract»

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  • Spatial and temporal processing of GPS signals

    Publication Year: 2000, Page(s):524 - 528
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    In this paper we address the problem of navigation data demodulation by an adaptive GPS receiver that utilizes a bank of single-satellite linear-tap-delay filters and employs antenna-array reception. The presence of an antenna array allows the receiver to operate in the spatial domain in addition to the temporal (code) domain. We investigate disjoint-domain as well as joint-domain space-time GPS s... View full abstract»

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  • On the use of cyclostationary filters to transmit information

    Publication Year: 2000, Page(s):196 - 200
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Linear periodic time-varying filters are often introduced today in telecommunications. They spread the spectrum and can be used for scrambling, multi-user access or channel modeling. Recently, the authors have defined linear cyclostationary filters. In particular, this generalization has permitted us to take into account the random parameters of a transmission channel. This paper defines a new cas... View full abstract»

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  • Approximate maximum likelihood blind source separation with arbitrary source PDFs

    Publication Year: 2000, Page(s):368 - 372
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    We present a quasi-maximum likelihood approach to blind source separation (BSS) which is based on approximating the source distributions by their truncated Edgeworth expansions. The paper focuses on the 2×2 case, for which the problem is known to reduce to the estimation of a single rotation angle. Unlike existing maximum likelihood BSS techniques, the proposed algorithm is consistent for an... View full abstract»

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  • Joint synchronization and symbol detection in asynchronous DS-CDMA systems

    Publication Year: 2000, Page(s):687 - 691
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The design of accurate estimators which also consider the noise term in low SNR scenarios is paramount for achieving optimal solutions and obtaining precise symbol detectors. Particularly, this paper estimates the propagation delays focusing on asynchronous DS-CDMA systems. The proposed minimum conditioned variance (MCV) is the choice in noisy environments, implementing the best linear detector of... View full abstract»

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  • Nonlinear system inversion applied to random variable generation

    Publication Year: 2000, Page(s):248 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A method to design random variable (RV) generators with the same probability density function (PDF) as a given RV record is presented. The resulting RV generator is a nonlinear system that when driven by a uniformly distributed RV, provides an output RV with the desired PDF distribution. The analytical description of the desired PDF is not needed; in fact, only a data record of the desired RV is u... View full abstract»

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  • Beam patterns of an underwater acoustic vector hydrophone

    Publication Year: 2000, Page(s):732 - 736
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A vector hydrophone is composed of two or three spatially collocated but orthogonally oriented velocity hydrophones plus an optional collocated pressure hydrophone. A vector hydrophone may form azimuth-elevation beams that are frequency invariant, bandwidth invariant and same for the near field as for the far field. This paper characterizes the maximum-SINR beam pattern and the matched-filter beam... View full abstract»

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