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Träfflista för sökning "swepub ;pers:(Ottersten Björn 1961);spr:eng;srt2:(2000-2004)"

Sökning: swepub > Ottersten Björn 1961 > Engelska > (2000-2004)

  • Resultat 21-30 av 42
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21.
  • Klang, Göran, et al. (författare)
  • Structured Semi-Blind Interference Rejection in Dispersive Multichannel Systems
  • 2002
  • Ingår i: IEEE Transactions on Signal Processing. - : IEEE Signal Processing Society. - 1053-587X .- 1941-0476. ; 50:8, s. 2027-2036
  • Tidskriftsartikel (refereegranskat)abstract
    • The impact of interference is one of the most capacity limiting factors in cellular networks today. In order to host more users in existing systems and maximize the capacity of future networks, the use of interference suppression techniques are instrumental. In this paper, we propose a structured semi-blind parameter estimation procedure to support rejection, of unknown cochannel interference (CCI) in systems facing multipath channels with non-negligible delay spread. Employing spatio-temporal processing, the proposed scheme exploits the temporal correlation present in the output signal from an antenna array and the training data of a desired user in order to find parameter estimates that fit the range space of a structured CCI model to the signal subspace of the interfering signals. Simulation results illustrating the behavior of a spatio-temporal receiver using the proposed scheme with respect to both signal-to-noise and signal-to-interference ratios (SNRs and SIRs) are presented. In addition, results highlighting the impact of the training sequence length as well as the impact of the channel model order of the CCI users are also included.
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22.
  • KRISTENSSON, Martin, et al. (författare)
  • Co-channel interference rejection in a digital receiver
  • 2000
  • Patent (populärvet., debatt m.m.)abstract
    • The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.
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23.
  • Kristensson, Martin, et al. (författare)
  • Further Results and Insights on Subspace Based Sinusoidal Frequency Estimation
  • 2001
  • Ingår i: IEEE Transactions on Signal Processing. - : IEEE Signal Processing Society. - 1053-587X .- 1941-0476. ; 49:12, s. 2962-2974
  • Tidskriftsartikel (refereegranskat)abstract
    • Subspace-based methods for parameter identification have received considerable attention in the literature. Starting with a scalar-valued process, it is well known that subspace-based identification of sinusoidal frequencies is possible if the scalar valued data is windowed to form a low-rank vector-valued process. MUSIC and ESPRIT-like estimators have, for some time, been applied to this vector model. In addition, a statistically attractive Markov-like procedure for this class of methods has been proposed. Herein, the Markov-like procedure is reinvestigated. Several results regarding rank, performance, and structure are given in a compact manner. The large sample equivalence with the approximate maximum likelihood method by Stoica et al. (1988) is also established
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24.
  • Kristensson, Martin, et al. (författare)
  • Optimum Subspace Methods
  • 2001
  • Ingår i: Signal Processing Advances in Communications. - : Prentice Hall. ; , s. 139-177
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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25.
  • Kristensson, Martin, et al. (författare)
  • Receiver
  • 2003
  • Patent (populärvet., debatt m.m.)abstract
    • The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.
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26.
  • Martin, Cristoff, et al. (författare)
  • Joint Channel Estimation and Detection for Interference Cancellation in Multi-Channel Systems
  • 2000
  • Ingår i: The 10th IEEE Workshop on Statistical Signal and Array Processing. - : IEEE. ; , s. 186-190
  • Konferensbidrag (refereegranskat)abstract
    • Interference from other users and interference due to multipath propagation limit the capacity of wireless communication networks. As the number of users and the demand for new services in the networks increases, co-channel interference will be a limiting factor. This paper proposes an iterative structured multichannel receiver algorithm that jointly estimates the communication channels and desired data while cancelinginterference. A general way of adding training redundancy to a data frame is also introduced. From simulations the proposed method is shown to achieve low bit error rates also in the presence of strong interference. These simulations also show that by distributing the training information in a data burst elaborately further improvements in performance are achievable.
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27.
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28.
  • Martin, Cristoff, et al. (författare)
  • Spatial loading based on channel covariance feedback and channel estimates
  • 2004
  • Ingår i: Proceedings European Signal Processing Conference.
  • Konferensbidrag (refereegranskat)abstract
    • Techniques for communication over flat multi-input, multi-output (MIMO) channels are well established when either perfect channel state information or no channel state information is available at the transmitter. However, communication over channels where the transmitter has access to partial or imperfect information has received less attention. If explored, such information could improve system performance and reduce the demand on feedback channels or the quality of channel estimates. In this paper, a simple design scheme is introduced, that approximately maximizes the data rates of MIMO communication systems where the transmiter have access to partial channel state information in the form of covariance feedback or erroneous channel estimates. The presented algorithm is computationally attractive and gains compared with systems not exploring this information are demonstrated.
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29.
  • Nilsson, Martin, et al. (författare)
  • A Cluster Approach to Spatio-Temporal Channel Estimation
  • 2000
  • Ingår i: <em>IEEE International Conference on Acoustics, Speech, and Signal Processing</em>. - : IEEE. ; , s. 2757-2760
  • Konferensbidrag (refereegranskat)abstract
    • In a severe multipath environment the antenna receives multiple copies of the same transmitted signal. To solve for all waves is difficult if possible at all. In this paper we use the approach of grouping the spatio-temporalreflections into clusters. We study how the aperture and bandwidth affects the cluster resolution using experimental data. The measurements were obtained by transmitting linear FM (chirp) signals of 150 MHz bandwidth, in the 1800 MHz band. An antenna array of 16 elements was used as a receiver.
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30.
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  • Resultat 21-30 av 42

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