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The infrastructure for 3G has been under development in Sweden since late 2000. Following from the so called beauty contest four operators within three years were to build competing systems to cover 99,98 percent of the population by the end of 2003, giving the administrative system an extreme challenge. Issues widely debated has been the alleged hazardousness of the electromagnetic radiation from
This paper presents a prediction algorithm for OFDM radio channels in either time or frequency direction that explores the over sampling of the channel transfer function compared to the maximum Doppler shift and the maximum excess delay. The algorithm derives an autoregressive model utilized for prediction. Pre-filtering of channel estimates are concerned and the prediction approach is appraised a
Stora sociala rörelser uppträder ofta provokativt, men med syftet att göra demokratins rum större. Den senaste är den globala rättviserörelsen som föddes i Seattle 1999. Magnus Wennerhags nya bok Global rörelse är den första stora svenska undersökningen av vad den betyder. I det utdrag Arena nu publicerar visar han hur den skiljer sig från 68-rörelserna: mer politisk och mer inriktad på internatio
It is known that the compactness of mobile terminals complicates the design of multiple antennas, since coupling between the antennas increases when they are placed in proximity of one another. While it is possible to mitigate coupling between closely spaced antennas, a tradeoff in bandwidth is required. In this paper, we highlight ground plane excitation as an additional dimension to consider in
Abstract BACKGROUND: Most individuals with Helicobacter pylori infection in Western countries have no evidence of peptic ulcer disease (PUD). We therefore assessed the PiZ deficiency variant of the major plasma protease inhibitor alpha1-antitrypsin (alpha1AT) as a risk factor for PUD in H. pylori-infected individuals. METHODS: The cohort comprised 100 patients with endoscopically or surgically pr
