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Prediction of Radio Channels for OFDM by Autoregressive Modeling

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

Globalrörelsens politik

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

Antenna design tradeoff of multiple antenna terminals with ground plane excitation

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

Alpha1-antitrypsin deficiency (PiZ) may be a risk factor for duodenal ulcer in patients with Helicobacter pylori infection

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