928 resultados para CsI(Tl)


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Multi-carrier modulations are widely employed in ionospheric communications to mitigate the adverse effects of the HF channel. In this paper we show how performance achieved by these modulations can be further increased by means of CSIbased precoding techniques in the context of our research on interactive digital voice communications. Depending on communication constraints and channel parameters, we will show which of the studied modulations and precoding techniques to select so that to maximise performance.

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An eyewitness account of Yaqub Beg's rule in parts of Xinjiang.

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No more published.

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Includes bibliographical references (p. [295]-300) and index.

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Provenance: donated by Bern Dibner.

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1. Kříž u potoka. 4. vyd. 1900.--2. Zvonečková královna. 4. vyd. [n.d.].--3. Vesnický román.--4. Černý Petříček.--5. Kantůrčice.--6. Pod starými krovy.--7. Nemodlenec.--8. Kresby z ještědí.--9. První Češka.--10. Ze staré Prahy.--11. Prostá mysl, I. Řada obrázků z poještědí.--12. Ohlasy z roku 1848.--13. Frantina.--14. Upomínky.--15. Prostá mysl, II. Povídky vesnické.--16. Na úsvitě.--17 Romanetta z Ještěda, I.--18. Poslední paní Hlohovská.--19. Tendenční povídky pro náš lid.--20. Romanetta z Ještěda, II.--21. Novelly.--22. Miláček lidu svého.--23. Z rodinných podání.--24. Časové ohlasy, I.--25. Pověsti z Ještěda.--26. Novelly, II.--27. Láska k básníkovi.--28. Z let probuzení.--29. Novelly, III.--30. Z literárn\biho soukromí a drobné práce.

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Relay selection has been considered as an effective method to improve the performance of cooperative communication. However, the Channel State Information (CSI) used in relay selection can be outdated, yielding severe performance degradation of cooperative communication systems. In this paper, we investigate the relay selection under outdated CSI in a Decode-and-Forward (DF) cooperative system to improve its outage performance. We formulize an optimization problem, where the set of relays that forwards data is optimized to minimize the probability of outage conditioned on the outdated CSI of all the decodable relays’ links. We then propose a novel multiple-relay selection strategy based on the solution of the optimization problem. Simulation results show that the proposed relay selection strategy achieves large improvement of outage performance compared with the existing relay selection strategies combating outdated CSI given in the literature.