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Featured researches published by George Jöngren.


international zurich seminar on digital communications | 2004

Design of near-orthogonal LD space-time codes

George Jöngren

This work considers a wireless multiinput-multioutput (MIMO) communication system in a frequency-nonselective scenario with spatially uncorrelated Rayleigh fading channel coefficients and investigates the design of linear dispersion (LD) space-time block codes. By optimizing the constituent weight matrices so that an upper bound on the union bound of the codeword error probability is minimized, good LD codes are obtained regardless of transmit antenna array size and code rate. We make the interesting observation that the proposed design procedure automatically generates LD codes that either correspond to, or are close to, the well-known class of orthogonal space-time block (OSTB) codes. A theoretical analysis confirms the correctness of the observation by proving that OSTB codes are indeed optimal, when the setup under study permit their existence. Simulation results demonstrate the excellent performance of the designed codes. In particular, the importance of the codes near-orthogonal property is illustrated by showing that low-complexity linear equalizer techniques can be used for decoding purposes while incurring a relatively small performance loss compared with optimal maximum likelihood (ML) decoding.


Archive | 2015

METHOD AND ARRANGEMENTS IN A TELECOMMUNICATION SYSTEM

George Jöngren; Bo Göransson; Lei Wan


Archive | 2008

Feedback reduction for codebook subset restriction

Bo Göransson; George Jöngren


european signal processing conference | 2000

Structured spatial interference rejection combining

George Jöngren; David Astely; Björn Oftersten


Archive | 2008

Increasing a sectorization order in a first sector of an antenna array

Lei Wan; George Jöngren; David Astely


Archive | 2012

NETWORK NODE AND A METHOD THEREIN FOR SCHEDULING A DOWNLINK DATA TRANSMISSION TO A UE, AND A UE AND A METHOD THEREIN FOR RECEIVING A DOWNLINK DATA TRANSMISSION

Stefano Sorrentino; David Hammarwall; George Jöngren


Archive | 2008

Calibration method and device in telecommunication system

George Jöngren; David Astely; Bo Göransson; Jonas Karlsson


Archive | 2013

Methods and devices for channel estimation

Stefano Sorrentino; George Jöngren


Archive | 2010

Method and apparatus for improving demodulation performance using demodulation reference signals power boosting

Yang Hu; David Astely; George Jöngren; Jianfeng Wang


Archive | 2017

controle de potência de circuito fechado em uma rede heterogênea por meio da seleção entre conjuntos de valores de fase de potência acumulativos

Aram Antó; George Jöngren; Stefan Parkvall; Stefano Sorrentino

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