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Peer Reviewed
See detailSemidefinite Programming for Detection in Linear Systems - Optimality Conditions and Space-Time Decoding
Jaldén, Joakim; Martin, Cristoff; Ottersten, Björn UL

in IEEE International Conference on Acoustics Speech and Signal Processing (2003)

Optimal maximum likelihood detection of finite alphabet symbols in general requires time consuming exhaustive search methods. The computational complexity of such techniques is exponential in the size of ... [more ▼]

Optimal maximum likelihood detection of finite alphabet symbols in general requires time consuming exhaustive search methods. The computational complexity of such techniques is exponential in the size of the problem and for large problems sub-optimal algorithms are required. In this paper, to find a solution in polynomial time, a semidefinite programming approach is taken to estimate binary symbols in a general linear system. A condition under which the proposed method provides optimal solutions is derived. As an application, the proposed algorithm is used as a decoder for a linear space-time block coding system and the results are illustrated with numerical examples. [less ▲]

Detailed reference viewed: 25 (0 UL)
Peer Reviewed
See detailModels for MIMO Propagation Channels, A Review
Yu, Kai; Ottersten, Björn UL

in Wireless Communications & Mobile Computing (2002), 2(7), 653666

Detailed reference viewed: 30 (0 UL)
Peer Reviewed
See detailStructured Semi-Blind Interference Rejection in Dispersive Multichannel Systems
Klang, Göran; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2002), 50(8), 20272036

Detailed reference viewed: 19 (0 UL)
Peer Reviewed
See detailCombining Beamforming with Orthogonal Space-Time Block Coding
Jöngren, George; Skoglund, Mikael; Ottersten, Björn UL

in IEEE Transactions on Information Theory (2002), 48

Detailed reference viewed: 12 (0 UL)
Peer Reviewed
See detailA Generalization of Weighted Subspace Fitting to Full Rank Models
Bengtsson, Mats; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2001), 49(5), 10021012

Detailed reference viewed: 24 (0 UL)
Peer Reviewed
See detailOptimal and Suboptimal Transmit Beamforming
Bengtsson, Mats; Ottersten, Björn UL

in Godara, Lal C. (Ed.) Handbook of Antennas in Wireless Communications (2001)

Detailed reference viewed: 80 (1 UL)
Peer Reviewed
See detailChirp Parameter Estimation from a Sample Covariance Matrix
Völcker, Björn; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2001)

Detailed reference viewed: 19 (0 UL)
Peer Reviewed
See detailFurther Results and Insights on Subspace Based Sinusoidal Frequency Estimation
Kristensson, Martin; Jansson, Magnus; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2001), 49(12), 29622974

Detailed reference viewed: 18 (0 UL)
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Peer Reviewed
See detailSystem Evaluation of Optimal Downlink Beamforming in Wireless Communication
Stridh, Rickard; Bengtsson, Mats; Ottersten, Björn UL

in Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th (2001)

We investigate the use of joint optimal downlink beamforming, power control and access point allocation, in a multicell SDMA system. Smart antennas are used at the access points and single antennas are ... [more ▼]

We investigate the use of joint optimal downlink beamforming, power control and access point allocation, in a multicell SDMA system. Smart antennas are used at the access points and single antennas are used at the terminals. The possibility to send messages to multiple terminals on the same frequency in the same time slot is exploited. An algorithm for removing users from a congested system, in order to avoid outage is proposed and evaluated Results show that the proposed algorithm gives substantial increase of the system performance compared to random removal of users. [less ▲]

Detailed reference viewed: 124 (0 UL)
Peer Reviewed
See detailLow-Complexity Estimators for Distributed Sources
Bengtsson, Mats; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2000), 48(8), 21852194

Detailed reference viewed: 18 (0 UL)
Peer Reviewed
See detailMIMO Channel Capacity on a Measured Indoor Radio Channel at 5.8 GHz
Stridh, Rickard; Karlsson, Peter; Ottersten, Björn UL

in Proceedings Asilomar Conference on Signals, Systems & Computers (2000)

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 measurements in the 5.8 ... [more ▼]

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 measurements in the 5.8 GHz band 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 element spacing on the channel capacity is studied. Finally the possible HiperLAN/2 MIMO channel capacity, based on the measurements, is examined. [less ▲]

Detailed reference viewed: 82 (0 UL)
Peer Reviewed
See detailAntenna Arrays for Communications
Ottersten, Björn UL; Swindlehurst, Andrew Lee

in IEEE Signal Processing Magazine (1999), 16(2), 2527

Detailed reference viewed: 11 (0 UL)
Peer Reviewed
See detailDirection Estimation in Partially Unknown Noise Fields
Göransson, Bo; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (1999), 47

Detailed reference viewed: 17 (0 UL)
Peer Reviewed
See detailThe Effects of Local Scattering on Direction of Arrival Estimation with MUSIC
Asztély, David; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (1999), 47(12), 32203234

Detailed reference viewed: 25 (0 UL)
Peer Reviewed
See detailA Subspace Method for Direction of Arrival Estimation of Uncorrelated Emitter Signals
Jansson, Magnus; Göransson, Bo; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (1999), 47(4), 945956

Detailed reference viewed: 40 (0 UL)
Peer Reviewed
See detailModified IQML and Weighted Subspace Fitting without Eigendecomposition
Kristensson, Martin; Jansson, Magnus; Ottersten, Björn UL

in Signal Processing (1999), 79(1), 2944

Detailed reference viewed: 32 (0 UL)
Peer Reviewed
See detailAn Improved MUSIC Algorithm for Estimation of Time Delays in Asynchronous DS-CDMA Systems
Östman, Thomas; Parkvall, Stefan; Ottersten, Björn UL

in IEEE Transactions on Communications (1999), 47(11), 16281631

Detailed reference viewed: 19 (0 UL)
Peer Reviewed
See detailRobust Blind Second-Order Deconvolution
Gorokhov, Alexei; Kristensson, Martin; Ottersten, Björn UL

in IEEE Signal Processing Letters (1999), 6

Detailed reference viewed: 22 (0 UL)
Peer Reviewed
See detailSpatial Signature Estimation for Uniform Linear Arrays with Unknown Receiver Gains and Phases
Asztély, David; Swindlehurst, Andrew Lee; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (1999), 47(8), 21282138

Detailed reference viewed: 49 (0 UL)
Peer Reviewed
See detailAsynchronous Near-Far Resistant DS-CDMA Receivers Without A Priori Synchronization
Parkvall, Stefan; Ström, Erik G.; Milstein, Laurence B. et al

in IEEE Transactions on Communications (1999), 47(1), 7888

Detailed reference viewed: 28 (0 UL)