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Sökning: LAR1:lu > Gustafsson Mats > Linnéuniversitetet > (2007)

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  • Gustafsson, Mats, et al. (författare)
  • On the spectral efficiency of a sphere
  • 2007
  • Ingår i: Progress in Electromagnetics Research-Pier. - EMW Publishing. - 1070-4698. ; 67, s. 275-296
  • Tidskriftsartikel (refereegranskat)abstract
    • In many cases it is desired to have both high capacity and small antennas in wireless communication systems. Unfortunately, the antenna performance deteriorate when the antennas get electrically small. In this paper fundamental limitations from antenna theory and broadband matching are used to analyze the spectral efficiency of an arbitrary antenna inserted inside a sphere.
  • Nordebo, Sven, et al. (författare)
  • Fisher information analysis for two-dimensional microwave tomography
  • 2007
  • Ingår i: Inverse Problems. - IOP Publishing. - 0266-5611. ; 23:3, s. 859-877
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, a Fisher information analysis is employed to establish some important physical performance bounds in microwave tomography. As a canonical problem, the two-dimensional electromagnetic inverse problem of imaging a cylinder with isotropic dielectric losses is considered. A fixed resolution is analysed by introducing a finite basis, i.e., pixels representing the material properties. The corresponding Cramer-Rao bound for estimating the pixel values is computed based on a calculation of the sensitivity field which is obtained by differentiating the observed field with respect to the estimated parameter. An optimum trade-off between the accuracy and the resolution is defined based on the Cramer-Rao bound, and its application to assess a practical resolution limit in the inverse problem is discussed. Numerical examples are included to illustrate how the Fisher information analysis can be used to investigate the significance of measurement distance, operating frequency and losses in the canonical tomography set-up.
  • Nordebo, Sven, et al. (författare)
  • Sensitivity analysis for antenna near-field imaging
  • 2007
  • Ingår i: IEEE Transactions on Signal Processing. - IEEE--Institute of Electrical and Electronics Engineers Inc.. - 1053-587X. ; 55:1, s. 94-101
  • Tidskriftsartikel (refereegranskat)abstract
    • Although imaging and inverse scattering problems have been thoroughly studied during the last century, there is only a partial understanding of these complex problems. Most of the efforts have been placed on the development of efficient inversion algorithms and mathematical uniqueness results. In comparison, there are very few results and a limited knowledge about the information content in the inversion data. In this paper, we provide a mathematical framework for sensitivity analysis of antenna near-field imaging problems, based on the multipole expansion of the electromagnetic field and the Fisher information to quantify the quality of data. By exploiting this framework, a fundamental relation for accuracy and resolution is formulated based on the Cramer-Rao bound (CRB). The sensitivity analysis is illustrated using a relevant example with cylindrical measurement data.
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Nordebo, Sven, (5)
Persson, Mikael (2)
Fhager, Andreas (2)
Persson, Kristin, (1)
Nilsson, Börje, (1)
Lunds universitet (5)
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