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Sökning: swepub > Ottersten Björn 1961 > Engelska > Yu Kai

  • Resultat 1-7 av 7
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1.
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2.
  • Stridh, Rickard, et al. (författare)
  • MIMO channel capacity and modeling issues on a measured indoor radio channel at 5.8 GHz
  • 2005
  • Ingår i: IEEE Transactions on Wireless Communications. - IEEE Communications Society. - 1536-1276. ; 4:3, s. 895-903
  • Tidskriftsartikel (refereegranskat)abstract
    • Multiple transmitters and receivers can be used to provide high link capacity in future wireless systems. Herein, an analysis of indoor environment multiple-input-multiple-output (MIMO) measurements in the idustrial, scientific, and medical (ISM) band at 5.8 GHz is performed and the possible increase in capacity, utilizing multiple transmitters and receivers is examined. The investigation shows that in the measured indoor environment, the scattering is sufficiently rich to provide substantial link capacity increases. Furthermore, the effect of intra-element spacing on the channel capacity is studied. Our investigation also shows that the envelope of the channel coefficients for this obstructed-line-of-sight (OLOS) indoor scenario is approximately Rayleigh distributed and the MIMO channel covariance matrix can be well approximated by a Kronecker product of the covariance matrices describing the correlation at the transmitter side and the receiver side, respectively. A statistical narrowband model for the OLOS indoor MIMO channel based on this covariance structure is presented.
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3.
  • 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)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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4.
  • 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)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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5.
  • Yu, Kai, et al. (författare)
  • MIMO channel models
  • 2005
  • Ingår i: Smart Antennas : State of the Art. - Hindawi Publishing Corporation. - 977-5945-09-7 ; s. 271-292
  • Bokkapitel (övrigt vetenskapligt)
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6.
  • Yu, Kai, et al. (författare)
  • Narrowband MIMO Channel Modeling for LOS Indoor Scenarios
  • 2002
  • Ingår i: Proceedings XXVIIth Triennial General Assembly of the International Union of Radio Science (URSI).
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Herein, a line-of-sight (LOS) multiple input multiple output (MIMO) channel model is presented based on 5.2 GHzindoor MIMO channel measurements. The signal from the dominant direction is estimated and removed from the channel data. The residual part is shown to be Rayleigh distributed and its covariance matrix can be well approximated by theKronecker product of the covariance matrices seen from the transmitter and receiver respectively. Therefore we model the whole narrowband LOS indoor MIMO channel as a static rank one matrix plus a statistical model based on Rayleigh distribution with a multiplicative covariance structure.
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7.
  • Yu, Kai, et al. (författare)
  • On The Error of Kronecker Structure Based MIMO Channel Model
  • 2004
  • Ingår i: Proceedings of Nordic Radio Symposium, NRS 2004.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Herein, we investigate the mismatch of the Kronecker structure based MIMO channel model. Finding the minimum mismatch is trivial and the result is always 0. The maximization problem, on the other hand, is not convex in general. Therefore we combine semidefinite programming with a grid search, to find a lower bound of the maximum mismatch. Numerical examples show that the bound is tight even for moderate number of points in the grid. The resulting worst case model error, is much larger than the model error previously observed in measurement campaigns, which confirms that the channel correlation matrix can, indeed, be well approximated by the Kronecker product of the correlation matrices at the transmitter and receiver for the measured NLOS indoor scenarios.
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