Spectrum Allocation for Decentralized Transmission Strategies: Properties of Nash Equilibria (2009)
Peter Von Wrycza, Mats Bengtsson, Björn Ottersten
The interaction of two transmit-receive pairs coexisting in the same area and communicating using the same portion of the spectrum is analyzed from a game theoretic perspective. Each pair utilizes a...
Spectrum Allocation for Decentralized Transmission Strategies: Properties of Nash Equilibria (2009)
Peter Von Wrycza, Mats Bengtsson, Björn Ottersten
The interaction of two transmit-receive pairs coexisting in the same area and communicating using the same portion of the spectrum is analyzed from a game theoretic perspective. Each pair utilizes a...
Exploiting Temporal Channel Correlation in Opportunistic SD-OFDMA (2008)
Patrick Svedman, Leonard J. Cimini, Mats Bengtsson, Sarah Kate Wilson, Björn Ottersten
Abstract — In opportunistic SDMA, the base station forms several random beams simultaneously and relies on fast but limited feedback for scheduling users on the beams. In this paper, opportunistic...
DECENTRALIZED DYNAMIC CHANNEL ALLOCATION FOR MIMO SYSTEMS (2008)
Peter Von Wrycza, Mats Bengtsson, Björn Ottersten
A common scenario in wireless communication systems is one where several systems coexist in the same area and communicate using the same portion of the spectrum, possibly even using different radio...
David Hammarwall, Mats Bengtsson, Björn Ottersten, David Hammarwall, Student Member, Mats Bengtsson, ...
c ○ 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for...
Comparison and Cost Analysis of Smart and Opportunistic MIMO OFDM Schemes (2008)
Mats Bengtsson, Patrick Svedman, Per Zetterberg
Abstract — This paper attempts to compare the system downlink performance of a smart antenna scheme for OFDMA that utilizes channel covariance information with an opportunistic multi-antenna scheme...
Algorithms for Antenna Arrays (2007)
Signaler Sensorer, Mats Bengtsson
We study algorithms for signal waveform estimation the exploit knowledge about the Direction of Arrival(DOA). Traditionally, such DOA based Signal Copy algorithms are designed for an ideal...
ON APPROXIMATING A SPATIALLY SCATTERED SOURCE WITH TWO POINT SOURCES (2007)
Signaler Sensorer, Mats Bengtsson
Antenna array signal processing has emerged as a promising technique to improve the capacity and performance of wireless communication systems. One aspect that has received relatively little...
Spatio-Temporal Processing in Wireless Communications (2007)
Björn Ottersten, Petre Stoica, David Astély, Mats Bengtsson, Andreas Jakobsson
Herein, we provide an overview of the research conducted in the project "Spatio-Temporal Processing in Wireless Communications" supported by NUTEK's telecommunications program....
Kungl Tekniska Hgskolan (2007)
Signaler Sensorer, Bj Orn Ottersten, Mats Bengtsson, Mats Bengtsson, Bjorn Ottersten
We analyze different direction based signal copy algorithms for a model of angular spread caused by local scattering around each signal source. Optimal algorithms, in terms of Signal to Interference...
Recent Advances on MIMO Processing in the SATURN Project (2007)
Mats Bengtsson, Cristoff Martin, Björn Ottersten, Ben Slimane, Per Zetterberg
We highlight some recent results on the theory and algorithms for MIMO systems, obtained at the Royal Institute of Technology (KTH) within the SATURN project. The paper includes a a new approximate...
Optimal Downlink Beamforming Using Semidefinite Optimization (2007)
Signaler Sensorer, Mats Bengtsson, Mats Bengtsson, Bjrn Ottersten, Bjrn Ottersten
When using antenna arrays at the base station of a cellular system, one critical aspect is the transmission strategy. An optimal choice of beamformers for simultaneous transmission to several...
Mikael Skoglund, Tùng T. Kim, Mats Bengtsson, Erik G. Larsson, Mikael Skoglund
Accepted for publication in IEEE Transactions on Wireless Communications c ○ 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for...
Carlsson, Björn, Forsberg, Ole, Bengtsson, Mats, Tötterman, Thomas H., Essand, Magnus
BACKGROUND. In order to develop experimental immunotherapy for prostate and breast cancer it is of outmost importance to have representative target cell lines that through HLA class I molecules...
Eduard A. Jorswieck, Mats Bengtsson, Björn Ottersten, Eduard A. Jorswieck, Mats Bengtsson, Björn Ottersten
On the interplay between scheduling, user distribution,
Tùng T. Kim, Mats Bengtsson, Erik G. Larsson, Mikael Skoglund, Kungliga Tekniska Högskolan, Tùng T. Kim, ...
A simple structure to exploit both long-term and partial short-term channel state information at the transmitter (CSIT) over a family of correlated multiple-antenna channels is proposed. Partial...
Some notes on the Kronecker model (2006)
Kungl Tekniska Högskolan, Mats Bengtsson, Mats Bengtsson, Per Zetterberg, Per Zetterberg
The so-called Kronecker model for a MIMO channel is very popular, not the least because of its mathematical tractability. However, it has also often been criticized for not being able to accurately...
LOW COMPLEXITY ADMISSION IN DOWNLINK BEAMFORMING (2006)
Matteo Butussi, Mats Bengtsson, Matteo Butussi
c ○ 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for...
System comparison of smart and dumb antennas (2005)
Mats Bengtsson, Mats Bengtsson, Patrick Svedman, Patrick Svedman, Xi Zhang, ...
c ○ 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for...
David Samuelsson, Mats Bengtsson, Björn Ottersten, David Samuelsson, Mats Bengtsson, Björn Ottersten
c ○ 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for...
Rickard Stridh, Mats Bengtsson, Björn Ottersten
Accepted for publication in IEEE Transactions on Wireless Communications c ○ 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for...
Analysis of multi-cell MIMO measurements in an urban macro cell environment,” URSI GA (2005)
Niklas Jaldén, Per Zetterberg, Mats Bengtsson, Björn Ottersten
In this paper we analyze the properties of Multiple Input Multiple Output (MIMO) channels in urban macro-cell environments based on a narrow-band measurement campaign with simultaneous measurements...
Improved multiuser diversity using smart antennas with limited feedback (2005)
David Samuelsson, David Samuelsson, Mats Bengtsson, Mats Bengtsson, Björn Ottersten, Björn Ottersten
Multiuser diversity and beamforming are two techniques that promise dramatically increased system throughput and spectral efficiency. In most systems it has however been considered infeasible to...
Beamforming and Bit-loading Strategies for Multi-User SDMA with Admission Control (2005)
Mats Bengtsson, Diego Bartolomé, José López Vicario, Mats Bengtsson, Diego Bartolomé, José López Vicario, ...
c ○ 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for...
Socialt kapital â En studie av effekterna av relationer i företag och rekrytering (2004)
BENGTSSON, MATS, ROSENBERG, RASMUS
Syftet med uppsatsen är att åskådliggöra och diskutera det sociala kapitalet i två olika företag i distinkt olika branscher. Vid sidan om diskussionen kring socialt kapital kommer vi att...
Modeling of wide-band MIMO radio channels based on NLoS indoor measurements (2004)
Yu, Kai, Bengtsson, Mats, Ottersten, Bjorn, McNamara, DP, Karlsson, Peter, Beach, MA
In this paper, we first verify a previously proposed Kronecker-structure-based narrow-band model for nonline-ofsight (NLoS) indoor multiple-input–multiple-output (MIMO) radio channels based on...
Dempster-Shafer clustering using Potts spin mean field theory (2003)
Bengtsson, Mats, Schubert, Johan
In this article we investigate a problem within Dempster-Shafer theory where 2**q - 1 pieces of evidence are clustered into q clusters by minimizing a metaconflict function, or equivalently, by...
A wideband statistical model for NLOS indoor MIMO channels (2002)
Yu, Kai, Bengtsson, Mats, Ottersten, Bjorn, Karlsson, Peter, Beach, MA, McNamara, DP
Herein, results of 5.2 GHz wideband indoor multiple input multiple output (MIMO) channel measurements under the EU IST SATURN project are reported. Our investigation shows that for non-line-of-sight...
ÅBERG, JESPER, BENGTSSON, MATS, VON HOFSTEN, FREDRIK
SAMMANFATTNING SYFTE Syftet med uppsatsen är att beskriva och analysera hur uppbyggandet av ett starkt varumärke går till. Vi kommer att identifiera vilka fördelar ett starkt varumärke för med...
Narrowband MIMO channel modeling for LOS indoor scenarios (2002)
Kai Yu, Kai Yu, Mats Bengtsson, Mats Bengtsson, Björn Ottersten, Björn Ottersten, ...
Herein, a line-of-sight (LOS) multiple input multiple output (MIMO) channel model is presented based on 5.2 GHz indoor MIMO channel measurements. The signal from the dominant direction is estimated...
A wideband statistical model for nlos indoor mimo channels (2002)
Kungl Tekniska Högskolan, Kai Yu, Kai Yu, Mats Bengtsson, Mats Bengtsson, ...
Herein, results of 5.2 GHz wideband indoor multiple input multiple output (MIMO) channel measurements under the EU IST SATURN project are reported. Our investigation shows that for non-line-of-sight...
A 20 MHz HiperLAN/2 MIMO Channel Model in NLOS Indoor Scenarios (2002)
Kungl Tekniska Högskolan, Kai Yu, Kai Yu, Mats Bengtsson, Mats Bengtsson, ...
In this paper, we present results of 5.2 GHz wideband indoor multiple input multiple output (MIMO) channel measurements under the EU IST SATURN project . First we show the average power delay profile...
Second order statistics of NLOS indoor MIMO channels based on 5.2 GHz measurements (2001)
Yu, Kai, Bengtsson, Mats, Ottersten, Bjorn, McNamara, DP, Karlsson, Peter, Beach, MA
Herein, results from measurements conducted by the University of Bristol are presented. The channel characteristics of multiple input multiple output (MIMO) indoor systems at 5.2 GHz are studied. Our...
Zetterberg, P, Bengtsson, Mats, McNamara, DP, Karlsson, Peter, Beach, MA
A WLAN-type scenario where a base-station (access point) equipped with multiple antennas is transmitting and a mobile with only a single antenna is receiving, is considered. Three approaches are...
Measurement analysis of NLOS indoor MIMO channels (2001)
Yu, Kai, Bengtsson, Mats, Ottersten, Bjorn, Karlsson, Peter, McNamara, DP, Beach, MA
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 5.2 GHz....
Smart antennas cluster year 2000 report (2001)
Kermoal, JP, Schumacher, L, Beach, MA, Ottersten, Bjorn, Bengtsson, Mats, Laspougeas, P, ...
This paper contains the common work of the three projects involved in the adaptive antenna cluster, namely METRA, SATURN and ASILUM. The 2000 work was devoted to propagation methodology issues w.r.t...
Dempster-Shafer clustering using Potts spin mean field theory (2001)
Mats Bengtsson, Johan Schubert
In this article we investigate a problem within Dempster-Shafer theory where 2^q - 1 pieces of evidence are clustered into q clusters by minimizing a metaconflict function, or equivalently, by...
Measurement analysis of NLOS indoor MIMO channels (2001)
Kungl Tekniska Högskolan, Kai Yu, Kai Yu, Mats Bengtsson, Mats Bengtsson, ...
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...
Second order statistics of NLOS indoor MIMO channels based on 5.2 GHz measurements (2001)
Kungl Tekniska Högskolan, Kai Yu, Kai Yu, Mats Bengtsson, Mats Bengtsson, ...
Abstract – Herein, results from measurements conducted by the University of Bristol are presented. The channel characteristics of Multiple Input Multiple Output (MIMO) indoor systems at 5.2 GHz are...
Jointly Optimal Downlink Beamforming and Base Station Assignment (2001)
We present an algorithm that jointly determines the optimal downlink beamformers and the optimal assignment of each mobile to a base station. The optimality criterion is based on a systems...
Dempster-Shafer clustering using Potts spin mean field theory (2001)
Mats Bengtsson, Johan Schubert
In this article we investigate a problem within Dempster-Shafer theory where 2^q - 1 pieces of evidence are clustered into q clusters by minimizing a metaconflict function, or equivalently, by...
Optimal Transmission using Smart Antennas (2000)
Smart Antennas, Mats Bengtsson
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...
Robust and constrained downlink beamforming (2000)
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...
Uplink and downlink beamforming for fading channels (1999)
Signaler Sensorer, Mats Bengtsson, Mats Bengtsson, Bjrn Ottersten, Bjrn Ottersten
We highlight some issues in the design of beamformers for transmission and reception in communications systems with antenna arrays at the base stations. We assume a radio channel characterized by...
Spatio-temporal processing for wireless communications (1998)
Signaler Sensorer, Mats Bengtsson, Andreas Jakobsson, Bjorn Ottersten, Bjorn Ottersten, Petre Stoica, ...
Herein, we provide an overview of the research conducted in the project "Spatio-Temporal Processing in Wireless Communications " supported by NUTEK's telecommunications...
A Subspace Fitting-Like Method For Almost Low Rank Models (1998)
Signaler Sensorer, Mats Bengtsson, Mats Bengtsson
Subspace fitting methods have grown popular for parameter estimation in many different application, for example sensor array signal processing, blind channel identification and identification of...
Spatio-Temporal Processing for Wireless Communications (1998)
David Asztély, Signaler Sensorer, Martin Kristensson Bjorn, Mats Bengtsson, Mats Bengtsson, Martin Kristensson, ...
The use of base station antenna arrays in a wireless network can allow a more efficient use of the spatial dimension. Multiple antennas can provide processing and diversity gain to increase the base...
Rooting Techniques for Estimation of Angular Spread with an Antenna Array (1997)
Signaler Sensorer, Bj Orn Ottersten, Mats Bengtsson, Mats Bengtsson, Björn Ottersten
When antenna arrays are used in mobile communications systems, multipath propagation effects must be taken into account. Local scattering around each signal source causes angular spreading. One...
Low Complexity Estimation of Angular Spread with an Antenna Array (1997)
Mats Bengtsson Bjorn, Signaler Sensorer, Mats Bengtsson, Mats Bengtsson, Bjorn Ottersten, Bjorn Ottersten
: When sensor array processing is applied in for example mobile communication applications, more parameters than the direction of arrival are necessary to properly describe the propagation channel....
Sensor Array Processing for Scattered Sources (1997)
In the search of improved capacity and performance in wireless communication systems, antenna arrays have emerged as a promising technique. In these applications, as well as radar and other sensor...
Low Complexity Estimators for Distributed Sources (1997)
Signaler Sensorer, Mats Bengtsson, Mats Bengtsson
¯ In antenna array applications, the propagation environment is often more complicated than the ordinary assumption of plain wavefronts. Here, a low complexity algorithm is suggested for estimating...
Low Complexity Estimation of Angular Spread with an Antenna Array (1997)
Signaler Sensorer, Mats Bengtsson, Mats Bengtsson, Bjorn Ottersten, Bjorn Ottersten
: When sensor array processing is applied in for example mobile communication applications, more parameters than the direction of arrival are necessary to properly describe the propagation channel....
Signal Waveform Estimation from Array Data in Angular Spread Environment (1996)
Signaler Sensorer, Bj Orn Ottersten, Mats Bengtsson, Mats Bengtsson, Bjorn Ottersten
We analyze different direction based signal copy algorithms for a model of angular spread caused by local scattering around each signal source. Optimal algorithms, in terms of Signal to Interference...
The Impact of Local Scattering on Signal Copy Algorithms for Antenna Arrays (1996)
Signaler Sensorer, Mats Bengtsson
We study algorithms for signal waveform estimation the exploit knowledge about the Direction of Arrival(DOA). Traditionally, such DOA based Signal Copy algorithms are designed for an ideal...
Thesis (doctoral)--Uppsala universitet, 1991.
Real-Time Compacting Garbage Collection (1990)
Mats Bengtsson, Boris Magnusson
This paper deals with compacting garbage collection in real-time programs, i.e., programs that have to satisfy strict real-time requirements. Real-time programs are used to control physical...
Parton showers in a phenomenological context / (1987)
Thesis (doctoral)--Lunds universitet, 1987.