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Sökning: swepub > Ottersten Björn 1961 > Kungliga Tekniska Högskolan

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  • Kaiser, Thomas, et al. (författare)
  • When will smart antennas be ready for the market? : Part II - results
  • 2005
  • Ingår i: IEEE signal processing magazine (Print). - 1053-5888. ; 22:6, s. 174-176
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • The aim of this two-part forum is to shed more light on the future of smartantennas (SA) through discussions among a balanced group of experts from academia and industry. In part I, which appeared in the March 2005 issue of IEEE Signal Processing Magazine, each of the experts stated his own opinion after exchanging some thoughts by e-mail. Then, a panel session took place at ICAS-SP'05 and a public poll followed. Now, in part II, the results are summarized by the experts. The central topic of the forum was the expectedmarket breakthrough of SA.
  • Ottersten, Björn, 1961-, et al. (författare)
  • Analysis of Subspace Fitting and ML Techniques for Parameter Estimation from Sensor Array Data
  • 1992
  • Ingår i: IEEE Transactions on Signal Processing. - 1053-587X. ; 40:3, s. 590-600
  • Tidskriftsartikel (refereegranskat)abstract
    • It is shown that the multidimensional signal subspace method, termed weighted subspace fitting (WSF), is asymptotically efficient. This results in a novel, compact matrix expression for the Cramer-Rao bound (CRB) on the estimation error variance. The asymptotic analysis of the maximum likelihood (ML) and WSF methods is extended to deterministic emitter signals. The asymptotic properties of the estimates for this case are shown to be identical to the Gaussian emitter signal case, i.e. independent of the actual signal waveforms. Conclusions concerning the modeling aspect of the sensor array problem are drawn.
  • Ottersten, Björn, 1961-, et al. (författare)
  • Direction-of-Arrival Estimation for Wideband Signals using the ESPRIT Algorithm
  • 1990
  • Ingår i: IEEE Transactions on Acoustics, Speech and Signal Processing. - IEEE Signal Processing Society. - 0096-3518. ; 38:2, s. 317-327
  • Tidskriftsartikel (refereegranskat)abstract
    • A novel direction-of-arrival estimation algorithm is proposed that applies to wideband emitter signals. A sensor array with a translation invariance structure is assumed, and an extension of the ESPRIT algorithm for narrowband emitter signals is obtained. The emitter signals are modeled as the stationary output of a finite-dimensional linear system driven by white noise. The array response to a unit impulse from a given direction is represented as the impulse response of a linear system. The measured data from the sensor array can then be seen as the output of a multidimensional linear system driven by white noise sources and corrupted by additive noise. The emitter signals and the array output are characterized by the modes of the linear system. The ESPRIT algorithm is applied at the poles of the system, the power of the signals sharing the pole is captured, and the effect of noise is reduced. The algorithm requires no knowledge, storage, or search of the array manifold, as opposed to wideband extensions of the MUSIC algorithm. This results in a computationally efficient algorithm that is insensitive to array perturbations. Simulations are presented comparing the wideband and ESPRIT algorithm to the modal signal subspace method and the coherent signal subspace method.
  • Ottersten, Björn, 1961-, et al. (författare)
  • Exact and Large Sample ML Techniques for Parameter Estimation and Detection in Array Processing
  • 1993
  • Ingår i: Radar Array Processing. - Berlin ; New York : Springer Berlin/Heidelberg. - 3-540-55224-3 (Berlin : acid-free paper) - 978-3-540-55224-6 (Berlin : acid-free paper) - 0-387-55224-3 (New York : acid-free paper) - 978-0-387-55224-8 (New York : acid-free paper) ; s. 99-151
  • Bokkapitel (övrigt vetenskapligt)abstract
    • Sensor array signal processing deals with the problem of extracting information from a collection of measurements obtained from sensors distributed in space. The number of signals present is assumed to be finite, and each signal is parameterized by a finite number of parameters. Based on measurements of the array output, the objective is to estimate the signals and their parameters. This research area has attracted considerable interest for several years. A vast number of algorithms has appeared in the literature for estimating unknown signal parameters from the measured output of a sensor array.
  • Ottersten, Björn, 1961-, et al. (författare)
  • Spatio-Temporal Processing in Wireless Communications
  • 1999
  • Ingår i: RadioVetenskap och Kommunikation (RVK). ; s. 402-406
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Herein, we provide an overview of the research conducted in the project "Spatio-Temporal Processing in Wireless Communications" supported by NUTEK's telecommunications program. Spatio-temporal processing at the base stations of a wireless system can provide processing gain which may be used to extend range and improve coverage of the network and/or improve signal quality and lower terminal power requirements. Furthermore, with spatially selective reception and transmission, the capacity in wireless communication systems can be increased without exploiting additional bandwidth. We will give an overview of the results of this research project to date. 
  • Parkvall, Stefan, et al. (författare)
  • Asynchronous near-far resistant DS-CDMA receivers without a priori synchronization
  • 1999
  • Ingår i: IEEE Transactions on Communications. - 0090-6778. ; 47:1, s. 78-88
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, several receivers for data demodulation in an asynchronous direct-sequence code-division multiple access (DS-CDMA) system operating without prior knowledge of the propagation delays are proposed and compared. Special attention is paid to the near-far problem, and the proposed schemes are numerically shown to he near-far resistant, The near-far resistance is obtained by estimating the a priori unknown propagation delay using a subspace-based technique. Quantities obtained in the estimation procedure are used to design a filter used for suppression of interference, according to the minimum mean square error criterion. Either a decision feedback technique or a simple two-state Viterbi algorithm is subsequently used for the data demodulation in the uncoded case, By extending the trellis used in the Viterbi algorithm, error correcting coding is easily implemented.
  • Parkvall, Stefan, et al. (författare)
  • Sensitivity Analysis of Linear DS-CDMA Detectors to Propagation Delay Estimation Errors
  • 1995
  • Ingår i: Proceedings IEEE Global Telecommunications Conference. ; s. 1872-1876
  • Konferensbidrag (refereegranskat)abstract
    • An asynchronous direct-sequence code division multiple access (DS-CDMA) communication system operating over an additive white Gaussian noise (AWGN) channel is considered. In many applications, the near-far problem can be the limiting factor. Several near-far resistant receivers have therefore been proposed (e.g., the decorrelating receiver). These receivers assume perfect knowledge of the propagation delay from all users to the receiver. In practice, the delays are estimated and therefore subject to estimation errors. The performance penalty these errors impose on linear detectors, especially the decorrelating detector, is evaluated
  • ROY, R, et al. (författare)
  • ESPRIT and Uniform Linear Arrays
  • 1989
  • Ingår i: Proceedings of the 33rd SPIE International Technical Symposium : Advanced Algorithms and Architectures for Signal Processing IV. ; s. 370-380
  • Konferensbidrag (refereegranskat)abstract
    • ESPRIT is a recently developed and patented technique for high-resolution estimation of signal parameters. It exploits an invariance structure designed into the sensor array to achieve a reduction in computational requirements of many orders of magnitude over previous techniques such as MUSIC, Burg's MEM, and Capon's ML, and in addition achieves performance improvement as measured by parameter estimate error variance. It is also manifestly more robust with respect to sensor errors (e.g. gain, phase, and location errors) than other methods as well. Whereas ESPRIT only requires that the sensor array possess a single invariance best visualized by considering two identical but other-wise arbitrary arrays of sensors displaced (but not rotated) with respect to each other, many arrays currently in use in various applications are uniform linear arrays of identical sensor elements. Phased array radars are commonplace in high-resolution direction finding systems, and uniform tapped delay lines (i.e., constant rate A/D converters) are the rule rather than the exception in digital signal processing systems. Such arrays possess many invariances, and are amenable to other types of analysis, which is one of the main reasons such structures are so prevalent. Recent developments in high-resolution algorithms of the signal/noise subspace genre including total least squares (TLS) ESPRIT applied to uniform linear arrays are summarized. ESPRIT is also shown to be a generalization of the root-MUSIC algorithm (applicable only to the case of uniform linear arrays of omni-directional sensors and unimodular cisoids). Comparisons with various estimator bounds, including CramerRao bounds, are presented.
  • Stoica, Petre, et al. (författare)
  • Comments on "Min-Norm interpretations and consistency of MUSIC, MODE, and ML"
  • 1998
  • Ingår i: IEEE Transactions on Signal Processing. - 1053-587X. ; 46:8, s. 2262-2263
  • Tidskriftsartikel (refereegranskat)abstract
    • The results and interpretations obtained in the above referred paper are shown to be well known or obvious. Additionally, corrections to some misleading statements in the aforementioned paper are presented.
  • Stoica, P, et al. (författare)
  • The evil of superefficiency
  • 1996
  • Ingår i: Signal Processing. - 0165-1684. ; 55:1, s. 133-136
  • Tidskriftsartikel (refereegranskat)abstract
    • We discuss the intriguing notion of statistical superefficiency in a straightforward manner with a minimum of formality. We point out that for any given parameter estimator there exist other estimators which have a strictly lower asymptotic variance and hence are statistically more efficient than the former. In particular, if the former estimator was statistically efficient (in the sense that its asymptotic variance was equal to the Cramer-Rao bound) then the latter estimators could be called ''superefficient''. Among others, the phenomenon of superefficiency implies that asymptotically there exists no uniformly minimum-variance parameter estimator.
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