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- Hult, Tommy, et al.
(författare)
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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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- Hult, Tommy, et al.
(författare)
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Application of Space-Time Signal Processing and Active Control Algorithms for the Suppression of Electromagnetic Fields
- 2011
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Ingår i: Applied Signal and Image Processing. - Hershey : IGI Global. - 9781609604776 ; , s. 45-60
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Bokkapitel (refereegranskat)abstract
- Several studies have been conducted on the effects of radiation on the human body. This has been especially important in the case of radiation from hand held mobile phones. The amount of radiation emitted from most mobile phones is very small, but given the close proximity of the phone to the head it might be possible for the radiation to cause harm. The suggested approach involves the use of adaptive active control algorithms and a full space-time processing system setup (i.e. multiple antennas at both the transmitter and receiver side or MIMO), with the objective of reducing the possibly harmful electromagnetic radiation emitted by hand held mobile phones. Simulation results show the possibility of using the adaptive control algorithms and MIMO antenna system to attenuate the electromagnetic field power density.
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- Hult, Tommy, et al.
(författare)
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Assessment of Multipath Propagation for a 2.4 GHz Short-Range Wireless Communication System
- 2007
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Konferensbidrag (refereegranskat)abstract
- In this paper we assess the multipath propagation effects of a short-range wireless device operating at 2.4 GHz in an indoor office environment. The investigations are carried out using FEM simulations and measurement trials for NLOS and LOS propagation scenarios. The FEM simulations will also be used for assessing the influence on propagation when doors are opened or closed. Finally, we investigate a single-input multiple-output (SIMO) antenna receive diversity system utilizing different combining techniques to improve the performance over a fading radio channel in a NLOS propagation environment. Simulation results show that a substantial diversity gain would be achieved by using this system. © 2007 IEEE
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- Hult, Tommy, et al.
(författare)
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CAPACITY OF A SATELLITE DIVERSITY SYSTEM EMPLOYING MULTIPLE POLARIZATIONS
- 2006
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Konferensbidrag (refereegranskat)abstract
- In this paper we address the potential gain of using compact MIMO antenna array configurations in conjunction with satellite diversity techniques in order to increase the data rates in satellite communication systems. Simulation results show that by exploiting the additional multiple polarization channels and satellite diversity we can achieve considerable capacity gain compared to the single satellite case.
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- Hult, Tommy, et al.
(författare)
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CAPACITY OF MULTIPLE HAP SYSTEM EMPLOYING MULTIPLE POLARIZATIONS
- 2006
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Konferensbidrag (refereegranskat)abstract
- In this paper we investigate the potential increase in capacity of HAP (High Altitude Platforms) communication systems using compact MIMO antenna array configurations in conjunction with HAP diversity techniques. In addition, we evaluate the system performance for different separation angles between HAPs. Simulation results show that the HAP diversity system provides superior performance compared to the single HAP case.
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