| 21. |
- Gustafsson, Mats, et al.
(författare)
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On the spectral efficiency of a volume
- 2004
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Ingår i: Proceedings International Symposium on Electromagnetic Theory. - 8884922526 ; , s. 176-178
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Konferensbidrag (refereegranskat)abstract
- The spectral efficiency of a volume in a MIMO environment is analyzed. The analysis is based on a spherical mode expansion for the propagation, the radiation Q for the antennas, and Fano theory for the broadband matching
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| 22. |
- Hult, Tommy, et al.
(författare)
-
Active Suppression of Electromagnetic Fields Using a MIMO Antenna System
- 2003
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Konferensbidrag (refereegranskat)abstract
- Active suppression of noise and vibrations is a well established field of research with many applications in acoustic and mechanical industries. In this paper we test some of these active control methods in order to assess their validity and performance when applied to electromagnetic fields. The application that we evaluated is a model of a mobile telephone equipped with one ordinary transmitting antenna and two actuator-antennas which purpose is to cancel out the electromagnetic field at a specific point in space (e.g. at your head).
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| 23. |
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| 24. |
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| 25. |
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| 26. |
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| 27. |
- Nordebo, Sven, et al.
(författare)
-
Fundamental Limitations for DOA Estimation by a Sphere
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we consider fundamental limitations for DOA estimation with arbitrary lossless antennas or antenna arrays inserted inside a sphere. Spherical vector modes and their associated equivalent circuits and Q factor approximations are employed as a general framework for the analysis. The classical broadband matching theory by Fano is extended to a general multiport S–parameter model of the antennas and fundamental bounds are given for the scattering parameters with respect to bandwidth and electrical size of the sphere. Finally, assuming a statistical signal model with Gaussian receiver noise, the Cramer–Rao lower bound is used to derive fundamental upper bounds for the performance of DOA estimation by a sphere.
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| 28. |
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| 29. |
- Nordebo, Sven, et al.
(författare)
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On the Use of Remes exchange algorithm for General Specifications
- 2000
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Ingår i: IEEE Transactions on Education. - New York : IEEE. - 0018-9359. ; 43:4, s. 460-3
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Tidskriftsartikel (refereegranskat)abstract
- The celebrated Remes multiple exchange algorithm for linear-phase digital FIR filter design is most commonly described for ordinary filter types (low-pass, high-pass, etc.) where it is sufficient to consider only the magnitude of the error function. Convergence for general specifications will be guaranteed only when the sign of the error function is incorporated. However, a discussion of this feature of the Remes algorithm is lacking in the literature on digital signal processing. The aim of this presentation is to fill in this gap by recasting the Remes exchange algorithm for the design of linear-phase finite-impulse response (FIR) filters with a general amplitude response specification
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| 30. |
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