By Topic

Sensor Array and Multichannel Signal Processing Workshop Proceedings, 2002

Date 6-6 Aug. 2002

Filter Results

Displaying Results 1 - 25 of 126
  • 2002 IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings (Cat. No.02EX593)

    Publication Year: 2002
    Request permission for commercial reuse | PDF file iconPDF (520 KB)
    Freely Available from IEEE
  • Differential and coherent decorrelating multiuser receivers for space-time coded CDMA systems

    Publication Year: 2002, Page(s):575 - 579
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (526 KB) | HTML iconHTML

    We consider the problem of multiuser receiver design for code-division multiple-access (CDMA) systems that utilize (differential) space-time block coding for transmission. In particular, we propose two differential and one coherent receivers for such systems. The differential receivers do not require the channel state information (CSI) for detection and, even so, are resistant to multiuser interfe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Author index

    Publication Year: 2002, Page(s):605 - 607
    Request permission for commercial reuse | PDF file iconPDF (171 KB)
    Freely Available from IEEE
  • A GLRT for radar detection in the presence of compound-Gaussian clutter and additive white Gaussian noise

    Publication Year: 2002, Page(s):87 - 91
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB) | HTML iconHTML

    This paper addresses the detection problem for a signal with constant, but unknown amplitude in disturbance containing compound-Gaussian clutter plus additive white noise. Specifically, a new generalized likelihood ratio test (GLRT) is presented for the clairvoyant case. Previously developed GLRT expressions addressing the compound-Gaussian clutter problem have considered the 'clutter only' case a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Parametric localization of multiple incoherently distributed sources using covariance fitting

    Publication Year: 2002, Page(s):332 - 336
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB) | HTML iconHTML

    A new algorithm for parametric localization of multiple incoherently distributed sources is proposed. Our algorithm is based on an approximation of the array covariance matrix using central and non-central moments of the source angular power densities. Based on this approximation, a new computationally simple covariance fitting-based technique is proposed to estimate these moments. The source para... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Insertion of diagonal loading into the multistage Wiener filter

    Publication Year: 2002, Page(s):379 - 382
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB) | HTML iconHTML

    Diagonal loading is a well-known technique for adding robustness to beamformer solutions. Diagonal loading will add robustness to steering vector direction-of-arrival mismatch; element position, gain, and/or phase perturbations; "statistical" mismatch due to finite sample support; etc. In a traditional sample matrix inversion implementation of the minimum variance distortionless response beamforme... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Doppler compensation for JDL for airborne bistatic radar

    Publication Year: 2002, Page(s):82 - 86
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB) | HTML iconHTML

    In airborne bistatic radar the clutter Doppler is range dependent. STAP processor using training data from other range gate will experience widening of clutter notch. Widening of the clutter notch causes a major problem in detecting slow moving target. In this paper, Doppler compensation using interpolation in the angle-Doppler domain, for joint domain localised processor (JDL) is proposed. Compar... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 2-D sensor position perturbation analysis: equivalence to AWGN on array outputs

    Publication Year: 2002, Page(s):219 - 223
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (442 KB) | HTML iconHTML

    The performance of a subspace beamformer, namely the multiple signal classification algorithm (MUSIC), is scrutinized in the presence of sensor position errors. Based on a perturbation model, a relationship between the array autocorrelation matrix and the source autocorrelation matrix is established. It is shown that under certain assumptions on the source signals, the Gaussian sensor perturbation... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Eigenstructure-based azimuth and elevation estimation in sparse uniform rectangular arrays

    Publication Year: 2002, Page(s):327 - 331
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB) | HTML iconHTML

    A new method for 2D direction of arrival (DOA) estimation in uniform rectangular arrays (URAs) is proposed. Unlike previous methods, which usually require fully loaded arrays, the proposed method can also be applied in the case of sparse URAs. The algorithm is based on an new formulation of the rank reduction estimator (RARE) which originally was derived for 1D DOA estimation in partly calibrated ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the construction of high-rate block-orthogonal multisensor block codes

    Publication Year: 2002, Page(s):452 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB) | HTML iconHTML

    In frequency-selective media, orthogonal space-time block codes (or alternatively their space-frequency counterparts) fail to achieve the maximum possible space-frequency diversity. The paper first proposes block-orthogonal multisensor codes (i.e., either space-time or space-frequency codes) for frequency-selective channels by considering data blocks rather than symbols as transmission units. Thes... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new approach to FM jammer suppression for digital communications

    Publication Year: 2002, Page(s):264 - 268
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB) | HTML iconHTML

    The paper considers FM jammer suppression in digital communications. It is pointed out that the cyclic autocorrelation function, commonly used for cyclostationary signals, and the ambiguity function, typically employed for analysis and recovery of nonstationary signals, such as FM, have the same formulation. However, nonstationary and cyclostationary signals have distinct localization properties i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Array configuration design for space-time adaptive processing systems

    Publication Year: 2002, Page(s):145 - 148
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB) | HTML iconHTML

    It is known that the design of antenna array configuration is an important issue to the antenna array applications. We present a method to design antenna array configurations for space-time adaptive processing (STAP) applied to mobile communication systems. We first derive an upper bound of the residual error power of STAP systems under the minimum mean square error (MMSE) criterion. Then, the rel... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Non-parametric detection of unknown correlated multichannel transients with sequential and block hypothesis testing in multiresolution spaces

    Publication Year: 2002, Page(s):375 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB) | HTML iconHTML

    The problem of detecting transient multichannel signals of unknown waveform shape has been widely studied due to the numerous applications associated with it. Nevertheless, the particular case of unknown source waveforms impinging on an array of closely spaced sensors and buried in strong spatially and temporally correlated noise process has received little attention due to its inherent complexity... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experimental study of the EM and SAGE algorithms with application to sonar data

    Publication Year: 2002, Page(s):77 - 81
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB) | HTML iconHTML

    We study the expectation maximization (EM) and space alternating generalized EM (SAGE) algorithms by processing real data measured by a towed hydrophone array. The EM and SAGE algorithms are well known numerical methods for locating modes of likelihood functions. The complicated multi-dimensional search for finding ML DOA estimates can be simplified to one dimensional search by EM and SAGE. Comput... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast algorithm for computing the maximum and minimum eigenpairs of large matrices

    Publication Year: 2002, Page(s):465 - 469
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB) | HTML iconHTML

    Computing all the eigenvalues and eigenvectors of a large matrix is a time-consuming operation. There are many applications in signal processing, control, and applied mathematics that require only the minimum and/or maximum eigenpairs. New methods for computing the smallest and largest eigenvalues of a symmetric matrix are developed. These methods are modifications of the Rayleigh quotient iterati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Channel estimation under space-time block-coded transmission

    Publication Year: 2002, Page(s):422 - 426
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    Space-time block coded transmission has established itself as an efficient means to enhance wireless communication performance over quasi-static fading channels. Its success relies on accurate channel knowledge on the receiver side. We present a new channel estimation approach that does not require training data to estimate the unknown channel. We present an unassisted channel identifiability cond... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A robust bearing estimator based on Jacobi-Anger expansion for large angular spread source

    Publication Year: 2002, Page(s):499 - 502
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB) | HTML iconHTML

    In the estimation of the bearing of an angularly spread source, the Taylor-expansion is commonly used, which may lead to a distinct model approximation error, especially for the large spread case. In order to overcome this problem as much as possible, we employ the JA-expansion model. On one hand, the model accuracy mainly depends on the order of the JA expansion but has no direct relation with an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Extraction of multiple-bounce echoes in SAR image formation

    Publication Year: 2002, Page(s):538 - 542
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB) | HTML iconHTML

    This analysis develops an innovative SAR image formation algorithm that separates direct-scatter echoes in an image from echoes that are the result of multiple bounces, and then maps each set of reflections to a metrically correct image space. Current processing schemes place the multiple-bounce (MB) echoes at incorrect (i.e., ghost) locations due to fundamental assumptions implicit in conventiona... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive super-exponential methods for blind multichannel equalization

    Publication Year: 2002, Page(s):585 - 589
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (497 KB) | HTML iconHTML

    An adaptive super-exponential algorithm for multichannel fractionally-spaced blind equalization is proposed. In the noise-free case, oversampling the received signal in space or time leads to a rank-deficient covariance matrix of the corresponding vector process. This seems to be the major obstacle towards a multichannel adaptive super-exponential algorithm. In the absence of additive noise, the o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • From academe to industry or from writing papers to making chips: experiences and conclusions

    Publication Year: 2002, Page(s):8 - 12
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB) | HTML iconHTML

    In recent years, the author has been involved in starting up a high-tech company and bringing both the product and the company itself to a successful fruition. The paper describes the author's experiences from this venture. The product in question was a VDSL modem, delivering about 15 megabits-per-second over unshielded telephone wires in full duplex. The paper reviews VDSL technology, its capabil... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Robust TDE-based DOA estimation for compact audio arrays

    Publication Year: 2002, Page(s):214 - 218
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (529 KB) | HTML iconHTML

    Cross-correlation based time delay estimates (TDE) can be used for direction-of-arrival (DOA) estimation with an acoustic array in not-too-reverberant environments. In order to benefit from the computational efficiency of TDE-based DOA estimation, and concentrating on applications that use a compact microphone array and low sampling frequency, we use a combination of approaches to make TDE-based D... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Blind channel estimation in multicode CDMA system with antenna array

    Publication Year: 2002, Page(s):565 - 569
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB) | HTML iconHTML

    This paper addresses the problem of blind channel estimation in a multicode DS-CDMA system in multipath environment using antenna array at the receiver. Long code CDMA system model is employed. Multicode transmission is used to provide a higher data rate to a mobile user and receiver antenna array improves the signal to interference and noise ratio (SINR). First we extend blind multicode channel e... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Data orthogonalization in sensor array signal processing

    Publication Year: 2002, Page(s):1 - 7
    Cited by:  Papers (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (611 KB) | HTML iconHTML

    This primarily tutorial paper presents a perspective on the development of adaptive data orthogonalization (ADO) for spatial sensor array sampled data vectors. The development of ADO methods is traced from a generalization of the split array, crosscorrelation arrival angle tracker for a single source, plane wave arrival to multiple coherent arrivals. Development is followed through to the more rec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • DOA estimation of multiple moving sources using recursive EM algorithms

    Publication Year: 2002, Page(s):323 - 326
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB) | HTML iconHTML

    The paper deals with maximum likelihood (ML) direction of arrival (DOA) estimation of multiple moving sources. The time-varying DOAs are described by a linear polynomial. Based on the recursive EM algorithm, we develop a recursive procedure to estimate the coefficients of the corresponding polynomial. Because of the simple structure of the augmented data, the resulting recursion has a very simple ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Blind separation of space-time block coded signals via the analytic constant modulus algorithm

    Publication Year: 2002, Page(s):447 - 451
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (498 KB) | HTML iconHTML

    Previous work has shown how the special structure of linear space-time block codes can be exploited for blind equalization or direct symbol estimation in MIMO wireless systems. In this paper it is demonstrated that improved performance can be obtained by combining the information provided by the structure of the code together with a priori knowledge that the data symbols are constant modulus. A va... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.