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Träfflista för sökning "LAR1:cth ;pers:(Viberg Mats 1961);conttype:(refereed)"

Sökning: LAR1:cth > Viberg Mats 1961 > Refereegranskat

  • Resultat 61-70 av 152
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61.
  • Moebus, Marco, et al. (författare)
  • Parameterization of Acoustic Signatures in Ultrasound Images for the Detection of Human Presence by Autonomous Vehicles
  • 2010
  • Ingår i: Proceedings of ICASSP 2010.
  • Konferensbidrag (refereegranskat)abstract
    • We address the problem of human detection for autonomousvehicles. Instead of using an optical system, we propose toemploy an acoustic 2D array to reliably obtain an image of ahuman in a 3D spatial power spectrum which is independentof lighting conditions and uses cheap ultrasound sensors.We show that humans have a distinct acoustic signature andpropose to model the echoes from reflecting parts of objectsin the scene by a Gaussian-Mixture-Model. When the model is fitted to the acoustic image, it is straightforward toobtain geometric relations between the present echoes andrepresent the acoustic signatures in a low-dimensional parameter space. We present results based on real data measurements that demonstrate that different objects can be reconstructed from the data and discriminated. The obtainedparameter space can then be the basis for subsequent detection and classification of humans.
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62.
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63.
  • Ngia, Lester S.H. 1965, et al. (författare)
  • Adaptive neural nets filter using a recursive Levenberg-Marquardt search direction
  • 1998
  • Ingår i: Proc. Asilomar Conf. Signals, Systems, Computers, 01 Nov 1998-04 Nov 1998. ; 1, s. 697-701
  • Konferensbidrag (refereegranskat)abstract
    • This paper proposes a recursive Levenberg-Marquardt (LM) search direction as the training algorithm for non-linear adaptive filters, which use multi-layer feed forward neural nets as the filter structures. The neural nets can be considered as a class of non-linear adaptive filters with transversal or recursive filter structures. In the off-line training, the LM method is regarded as an intermediate method between the steepest descent (SD) and Gauss-Newton (GN) methods, and it has better convergence properties than the other two methods. In the echo cancellation experiments, the recursive LM algorithm converges faster and gives higher echo return loss enhancement (ERLE) than the recursive SD and GN algorithms.
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64.
  • Nohlert, Johan, 1987, et al. (författare)
  • Global monitoring of fluidized-bed processes by means of microwave cavity resonances
  • 2014
  • Ingår i: Measurement: Journal of the International Measurement Confederation. - : Elsevier BV. - 0263-2241. ; 55, s. 520-535
  • Tidskriftsartikel (refereegranskat)abstract
    • We present an electromagnetic measurement system for monitoring of the effective permittivity in closed metal vessels, which are commonly used in the process industry. The measurement system exploits the process vessel as a microwave cavity resonator and the relative change in its complex resonance frequencies is related to the complex effective permittivity inside the vessel. Also, thermal expansion of the process vessel is taken into account and we compensate for its influence on the resonance frequencies by means of a priori information derived from a set of temperature measurements. The sensitivities, that relate the process state to the measured resonance frequencies, are computed by means of a detailed finite element model. The usefulness of the proposed measurement system is successfully demonstrated for a pharmaceutical fluidized-bed process, where the water and solid contents inside the process vessel is of interest.
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65.
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66.
  • Ozcelikkale, Ayca, 1982, et al. (författare)
  • MIMO Linear Precoder Design with Non-Ideal Transmitters
  • 2015
  • Ingår i: Proceedings of the International Symposium on Wireless Communication Systems. - 2154-0217 .- 2154-0225. ; , s. 681-685
  • Konferensbidrag (refereegranskat)abstract
    • We investigate the linear precoder design problem for multiple-input multiple-output (MIMO) channels under non-ideal transmitter hardware.We consider two different non-ideal hardware models: i) an additive noise model in which the level of the noise at an antenna is proportional to the signal power at that antenna, ii) an additive precoder error model. We focus on the problem of minimizing mean-square error at the receiver under transmit power constraints at the transmitter. For the first hardware impairment model, this scenario leads to a non-convex formulation for which we propose a block-coordinate descent technique. The proposed method has a convergence guarantee and provides rank-constrained solutions.For the second model, analytical expressions for the optimum designs are provided. We compare the performance of our hardware impairment aware designs with that of designs developed with ideal hardware assumptions. Our results suggest that significant gains can be obtained by the proposed designs for sufficiently high signal-to-noise ratio values.
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67.
  • Ozcelikkale, Ayca, 1982, et al. (författare)
  • Performance Bounds for Remote Estimation with an Energy Harvesting Sensor
  • 2016
  • Ingår i: IEEE International Symposium on Information Theory - Proceedings. - 2157-8095. - 9781509018062 ; 2016-August, s. 460-464
  • Konferensbidrag (refereegranskat)abstract
    • Remote estimation with an energy harvesting sensor with a limited data buffer is considered. The sensor node observes an unknown correlated circularly wide-sense stationary (c.w.s.s.) Gaussian field and communicates its observations to a remote fusion center using the energy it harvested. The fusion center employs minimum mean-square error (MMSE) estimation to reconstruct the unknown field. The distortion minimization problem under the online scheme, where the sensor has only access to the statistical information for the future energy packets is considered. We provide performance bounds on the achievable distortion under a slotted block transmission scheme, where at each transmission time slot, the data and the energy buffer is completely emptied. Our bounds provide insight to the trade-off between the buffer sizes and the achievable distortion. These trade-offs illustrate the insensitivity of the performance to the buffer size for signals with low degree of freedom and suggest performance improvements with increasing buffer size for signals with relatively higher degree of freedom.
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68.
  • Ozcelikkale, Ayca, 1982, et al. (författare)
  • Remote Estimation of Correlated Sources under Energy Harvesting Constraints
  • 2018
  • Ingår i: IEEE Transactions on Wireless Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-2248 .- 1536-1276. ; 17:8, s. 5300-5313
  • Tidskriftsartikel (refereegranskat)abstract
    • Remote estimation with an energy harvesting sensor with a limited data and energy buffer is considered. The sensor node observes an unknown temporally correlated field and communicates its observations to a remote fusion center using the energy it harvested. The fusion center employs linear minimum mean-square error (LMMSE) estimation to reconstruct the unknown field. We provide performance guarantees for the estimation error under a block transmission scheme, where at each transmission block, data and energy buffers are completely emptied. Our bounds provide insights into how statistical prop- erties of the energy harvesting process and buffer sizes may affect the estimation error. In particular, these bounds suggest insensitivity of the performance to buffer sizes for signals with low degree of freedom and suggest performance improvements with increasing buffer sizes for signals with relatively higher degree of freedom. Depending only on the mean, variance and finite support of the energy arrival process, these results provide insights for the energy and data buffer sizes for deployment in future energy harvesting wireless sensing systems.
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69.
  • Ozcelikkale, Ayca, 1982, et al. (författare)
  • Simultaneous Information and Power Transfer with Transmitters with Hardware Impairments
  • 2016
  • Ingår i: Proceedings of the International Symposium on Wireless Communication Systems. - 2154-0217 .- 2154-0225. - 9781509020614 ; 2016-October, s. 114-118
  • Konferensbidrag (refereegranskat)abstract
    • We investigate the performance of a communication system with simultaneous wireless information and power transfer capabilities under non-ideal transmitter hardware. We adopt an experimentally validated additive noise model in which the level of the noise at an antenna is proportional to the signal power at that antenna. We consider the linear precoder design problem and focus on the problem of minimizing the mean-square error under energy harvesting constraints. This set-up, in general, constitutes a non-convex formulation. For the single antenna information user case, we provide a tight convex relaxation, i.e. a convex formulation from which an optimal solution for the original problem can be constructed. For the general case, we propose a block coordinate descent technique to solve the resulting non-convex problem. Our numerical results illustrate the effect of hardware impairments on the system.
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70.
  • Ozcelikkale, Ayca, 1982, et al. (författare)
  • Transmission Strategies for Remote Estimation under Energy Harvesting Constraints
  • 2016
  • Ingår i: European Signal Processing Conference. - 2219-5491. - 9780992862657 ; , s. 572-576
  • Konferensbidrag (refereegranskat)abstract
    • We consider the remote estimation of a time- correlated field using an energy harvesting (EH) sensor. The sensor observes the unknown field and communicates its observa- tions to a remote fusion center using an amplify-forward strategy. We consider the design of optimal transmission strategies in order to minimize the mean-square error (MSE) at the fusion center. Contrary to traditional approaches, the degree of correlation between the field values constitutes an important aspect of our formulation. We provide the optimal power allocation strategies for a number of illustrative scenarios, including the circularly wide-sense stationary (c.w.s.s.) signals with static correlation coefficient and the sampled low-pass c.w.s.s. signals. Based on these results, we propose low-complexity policies for the general case. Numerical evaluations illustrate the performance of the optimal and the low-complexity policies.
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  • Resultat 61-70 av 152
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McKelvey, Tomas, 196 ... (21)
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Panahi, Ashkan, 1986 (14)
Stoica, P (12)
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Ozcelikkale, Ayca, 1 ... (8)
Ström, Marie, 1984 (8)
Cerullo, Livia, 1982 (7)
Chen, Ming, 1972 (6)
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Gu, Irene Yu-Hua, 19 ... (5)
Ottersten, Björn E. (5)
Matthaiou, Michail, ... (5)
Pelin, Per, 1969 (5)
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