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Distributed space-time code for amplify-and-forward cooperative networks

Cooperative diversity using distributed space-time codes has been recently proposed to form virtual antennas in order to achieve diversity gain. In this paper, we propose a distributed space-time coding with amplify-and-forward relaying. Motivated by protocol (III) presented in, we propose a distributed space-time code for an arbitrary number of relay nodes. The pairwise error probability (PEP) is

New phenomena discovered in the atmospheres of normal late-B type stars

We report detections of weak emission lines in main sequence B starspectra observed at high spectral resolution and high signal-to-noiseratio. The emission lines originate from highly excited states ofsingle-ionized species. The mechanism for populating these excitedstates is currently under investigation and the results may have asignificant bearing upon our understanding of the outermost atmosph

Rudolf Kjellén: Nordic biopolitics before the welfare state

This article aims to contribute to the history of biopolitical thought through a more accurate understanding of the Swedish professor of political science Rudolf Kjellén considered both in his historical and political context. Kjellén coined the term ‘biopolitics’, as early as 1905, in a two-volume work entitled The Great Powers, and developed it even further in a 1916 book entitled The State as a