Showing papers by "Mats Bengtsson published in 2000"
TL;DR: The present study showed that mechanisms involved in referred pain, temporal summation, muscular hyperalgesia, and muscle pain at rest were attenuated by the NMDA‐antagonist in FMS patients, and suggested a link between central hyperexcitability and the mechanisms for facilitated referred pain and temporal summary in a sub‐group of the fibromyalgia syndrome patients.
Abstract: Central mechanisms related to referred muscle pain and temporal summation of muscular nociceptive activity are facilitated in fibromyalgia syndrome (FMS) patients. The present study assessed the ef ...
380 citations
TL;DR: In antenna array applications, the propagation environment is often more complicated than the ordinarily assumed model of plane wavefronts, so a low-complexity algorithm is suggested for estimating both the DOA and the spread angle of a source subject to local scattering, using a uniform linear array.
Abstract: In antenna array applications, the propagation environment is often more complicated than the ordinarily assumed model of plane wavefronts. Here, a low-complexity algorithm is suggested for estimating both the DOA and the spread angle of a source subject to local scattering, using a uniform linear array. The parameters are calculated from the estimates obtained using a standard algorithm such as root-MUSIC to fit a two-ray model to the data. The algorithm is shown to give consistent estimates, and the statistical performance is studied analytically and through simulations.
167 citations
Proceedings Article•
01 Sep 2000TL;DR: A recently proposed strategy for optimal downlink beamforming is extended to give increased robustness to channel uncertainties and to incorporate constraints on the dynamic range.
Abstract: When antenna arrays are introduced in a cellular system, one critical aspect is the design of beamformers for downlink transmission. We extend a recently proposed strategy for optimal downlink beamforming to give increased robustness to channel uncertainties and to incorporate constraints on the dynamic range. The solution can be efficiently calculated using semidefinite optimization. In a few cases, the optimal solution is given by a time-varying beamformer. We explore the performance of these modified algorithms.
17 citations
01 Jan 2000
TL;DR: Two algorithms that provide an optimal set of downlink beamformers are reviewed and it is shown how to determine not only the beamforming vectors but also the optimal allocation of user terminals to base stations.
Abstract: We study the design of beamformers for transmission from a number of base stations to a number of user terminals. Since every transmitted signal will cause interference at all the other user terminals, an optimal beamformer design must be determined jointly for all the beamformers. We review two algorithms that provide an optimal set of downlink beamformers. We also show how to determine not only the beamforming vectors but also the optimal allocation of user terminals to base stations.
4 citations