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Sökning: swepub > Ottersten Björn 1961 > Engelska > Övrigt vetenskapligt/konstnärligt

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41.
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42.
  • Ottersten, Björn, 1961- (författare)
  • Spatial Division Multiple Access (SDMA) in Wireless Communications
  • 1995
  • Ingår i: Proceedings of Nordic Radio Symposium.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • This paper describes the utilization of antenna arrays at the base stations of wireless communication systems. Multiple antennas can provide a processing gain to increase the base station range and improve coverage. Also, by exploiting the angular selectivity of an antenna array at the base stations of a wireless system, users may be spatially multiplexed to increase system capacity. We address several aspects of the reception and transmission problems that arise when the spatial dimension is considered. Both the forward and reverse channels are discussed and an overview of related research conducted at the signal processing group, KTH is presented.
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43.
  • 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/konstnärligt)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. 
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48.
  • Viberg, Mats, et al. (författare)
  • A Comparison of Model-Based Detection and Adaptive Sidelobe Cancelling for Radar Array Processing
  • 1994
  • Ingår i: Proc. of Nordic Antenna Symposium.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The recent development of fast A/D converters and digital signal processors has considerably affected the modern radar system design. In the most popular configuration to date, the main channel (a conventional beamformer) is digitized along with a number of auxiliary channels. This configuration forms the basis for the adaptive sidelobe canceller (ASLC), which has been proposed for mitigating the influence of jammers that are present in the sidelobes of the main channel of the array. The ASLC can be efficiently implemented in real-time using recursive least-squares techniques, and has been demonstrated to perform well in certain scenarios. However, the ASLC has a number of shortcomings. The method fails, for instance when the target signal is too strong. This drawback can be eliminated by applying a parametric approach. Herein, the exact maximum likelihood (ML) estimator assuming a sinusoidal target signal is derived. The computational complexity of the ML estimator is found to be comparable to that of the ASLC. Initial simulation results indicate that the ML and ASLC methods perform similar at low SNR's, but that the ML estimator does not share the signal cancellation phenomena observed in thw ASLC.
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