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Träfflista för sökning "swepub ;pers:(Ottersten Björn 1961);spr:eng;conttype:(scientificother)"

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

  • Resultat 41-50 av 53
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41.
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45.
  • 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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48.
  • Yu, Kai, et al. (författare)
  • A 20 MHz HIPERLAN/2 MIMO Channel Model in NLOS Indoor Scenarios
  • 2002
  • Ingår i: Nordic Conference on Radio Science and Communications (RVK). ; , s. 311-315
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In this paper, we present results of 5.2 GHz wideband indoor multiple input multiple output (MIMO) channel measurementsunder the EU IST SATURN project. First we show the average power delay profile for the single input single output (SISO) channel. Furthermore, our investigation shows that for non-line-of-sight (NLOS) indoor scenarios, the MIMO channel covariance matrix of each normalized tap of channel impulse response can be be well approximated by the Kronecker product of the covariance matrices seen from the transmitter and receiver respectively.Based on the above results, a wideband statistical model for HiperLAN/2 MIMO channel is presented. Monte-Carlo simulations show reasonably good agreement between the measured data and our model. Finally, weuse this model to show the capacity characteristics of theHiperLAN/2 channel in NLOS indoor scenarios.
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49.
  • Yu, Kai, et al. (författare)
  • Measurement Analysis of NLOS Indoor MIMO Channels
  • 2001
  • Ingår i: Proceedings IST Mobile Communications Summit. ; , s. 277-282
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In this paper, we present results from measurements conducted by the University of Bristol.We study the channel characteristics of Multiple-Input-Multiple-Output (MIMO) indoor channel at 5.2GHz. Our investigation shows that the envelope of the channel for non-line-of-sight (NLOS) indoorsituations is approximately Rayleigh distributed and consequently we focus on a statistical descriptionof the first and second order moments of the narrowband MIMO channel. Furthermore, it is shown thatfor NLOS indoor scenarios, the MIMO channel covariance matrix can be well modeled by a Kroneckerproduct of the covariance matrices describing the correlation at the transmitter and the receiver siderespectively. A statistical narrowband model for the NLOS indoor MIMO channel based on thiscovariance structure is presented along with some simulation results.
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50.
  • Yu, Kai, et al. (författare)
  • MIMO channel models
  • 2005
  • Ingår i: Smart Antennas. - : Hindawi Publishing Corporation. - 9775945097 ; , s. 271-292
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Resultat 41-50 av 53
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