34 research outputs found

    PHY Abstraction Methodsfor OFDM and NOFDM Systems, Journal of Telecommunications and Information Technology, 2009 nr 3

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    In the paper various PHY abstraction methods for both orthogonal and non-orthogonal systems are presented, which allow to predict the coded block error rate (BLER) across the subcarriers transmitting this FEC-coded block for any given channel realization. First the efficiency of the selected methods is investigated and proved by the means of computer simulations carried out in orthogonal muticarrier scenario. Presented results are followed by the generalization and theoretical extension of these methods for non-orthogonal systems

    D13.3 Overall assessment of selected techniques on energy- and bandwidth-efficient communications

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    Deliverable D13.3 del projecte europeu NEWCOM#The report presents the outcome of the Joint Research Activities (JRA) of WP1.3 in the last year of the Newcom# project. The activities focus on the investigation of bandwidth and energy efficient techniques for current and emerging wireless systems. The JRAs are categorized in three Tasks: (i) the first deals with techniques for power efficiency and minimization at the transceiver and network level; (ii) the second deals with the handling of interference by appropriate low interference transmission techniques; (iii) the third is concentrated on Radio Resource Management (RRM) and Interference Management (IM) in selected scenarios, including HetNets and multi-tier networks.Peer ReviewedPostprint (published version

    Neuropsychological assessment of the professional hazards after long term exposure to lead (Pd)

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    ΟΙ ΕΡΕΥΝΗΤΕΣ ΣΥΓΚΛΙΝΟΥΝ ΣΤΗΝ ΑΠΟΨΗ ΟΤΙ ΕΛΛΟΧΕΥΕΙ ΝΕΥΡΟΤΟΞΙΚΟΣ ΚΙΝΔΥΝΟΣ ΑΠΟ ΤΗ ΧΡΟΝΙΑ ΕΠΑΓΓΕΛΜΑΤΙΚΗ ΕΚΘΕΣΗ ΤΟΥ ΑΝΘΡΩΠΟΥ ΣΕ ΒΕΒΑΡΗΜΕΝΟ ΠΕΡΙΒΑΛΛΟΝ ΜΕ PB. ΣΚΟΠΟΣ ΤΗΣ ΕΡΓΑΣΙΑΣ ΗΤΑΝ ΝΑ ΕΚΤΙΜΗΘΕΙ Ο ΝΨ ΚΙΝΔΥΝΟΣ ΣΕ ΣΥΝΘΗΚΕΣ ΑΤΜΟΣΦΑΙΡΙΚΗΣ ΜΟΛΥΝΣΗΣ.ΥΠΟΒΛΗΘΗΚΑΝ ΣΕ ΝΨ ΕΞΕΤΑΣΕΙΣ 51 ΟΔΗΓΟΙ ΤΑΞΙ,46 ΟΔΗΓΟΙ ΑΣΤΙΚΩΝ ΛΕΩΦΟΡΙΩΝ,38 ΒΕΝΖΙΛΟΠΩΣΕΣ ΚΑΙ 46 ΜΑΡΤΥΡΕΣ,ΜΕ ΣΚΟΠΟ ΝΑ ΕΚΤΙΜΗΘΟΥΝ ΟΙ ΝΕΥΡΟΨΥΧΟΛΟΓΙΚΕΣ ΛΕΙΤΟΥΡΓΙΕΣ ΚΑΙ ΝΑ ΑΝΙΧΝΕΥΘΟΥΝ ΟΙ ΕΠΙΠΤΩΣΕΙΣ ΤΗΣ ΧΡΟΝΙΑΣ ΕΚΘΕΣΗΣ ΣΤΙΣ ΑΝΩΤΕΡΕΣ ΛΕΙΤΟΥΡΓΙΕΣ. ΣΥΜΦΩΝΑ ΜΕ ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΤΗΣ ΜΕΛΕΤΗΣ,ΤΑ ΕΠΙΠΕΔΑ ΤΟΥ PB ΣΤΟ ΑΙΜΑ ΤΩΝ ΕΞΕΤΑΣΘΕΝΤΩΝ,ΒΡΕΘΗΚΑΝ ΧΑΜΗΛΟΤΕΡΑ ΑΠΟ ΤΟ ΑΣΦΑΛΗ ΟΡΙΑ.ΔΕΝ ΔΙΑΠΙΣΤΩΘΗΚΑΝ ΣΗΜΑΝΤΙΚΕΣ ΔΙΑΦΟΡΕΣ ΜΕΤΑΞΥ ΤΩΝ ΟΜΑΔΩΝ ΚΑΙ ΜΕΤΑΞΥ ΤΩΝ ΕΠΑΓΓΕΛΜΑΤΙΩΝ ΚΑΙ ΤΩΝ ΜΑΡΤΥΡΩΝ.ΔΙΑΦΑΙΝΕΤΑΙ ΟΜΩΣ ΤΑΣΗ Ο.PB ΝΑ ΕΠΗΡΕΑΖΕΙ ΤΗΝ ΤΑΧΥΤΗΤΑ ΠΟΥ ΑΠΑΙΤΕΙΤΑΙ ΓΙΑ ΤΗΝ ΕΠΕΞΕΡΓΑΣΙΑ ΟΠΤΙΚΩΝ ΠΛΗΡΟΦΟΡΙΩΝ,ΤΗΝ ΝΟΗΤΙΚΗ ΑΝΙΧΝΕΥΣΗ ΚΑΙ ΤΗΝ ΟΠΤΙΚΟΚΙΝΗΤΙΚΗ ΣΥΝΕΡΓΙΑ.ΣΥΜΠΕΡΑΣΜΑ: Η ΧΡΟΝΙΑ ΕΠΑΓΓΕΛΜΑΤΙΚΗ ΕΚΘΕΣΗ ΤΩΝ ΑΤΟΜΩΝ ΑΚΟΜΑ ΚΑΙ ΣΕ ΧΑΜΗΛΑ ΕΠΙΠΕΔΑ ΜΟΛΥΒΔΟΥ,ΑΠΟΤΕΛΕΙ ΝΕΥΡΟΤΟΞΙΚΟ ΚΙΝΔΥΝΟ ΚΑΙ ΤΑ ΝΕΥΡΟΨΥΧΟΛΟΓΙΚΑ ΕΥΡΗΜΑΤΑ ΤΗΣ ΜΕΛΕΤΗΣ ΕΝΙΣΧΥΟΥΝ ΤΗΝ ΑΠΟΨΗ ΟΤΙ ΔΕΝ ΥΠΑΡΧΟΥΝ "ΕΠΙΤΡΕΠΤΑ" ΟΡΙΑ ΕΚΘΕΣΗΣ

    Flexible Radio: A Framework for Optimized Multimodal Operation via Dynamic Signal Design

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    <p>The increasing need for multimodal terminals that adjust their configuration on the fly in order to meet the required quality of service (QoS), under various channel/system scenarios, creates the need for flexible architectures that are capable of performing such actions. The paper focuses on the concept of flexible/reconfigurable radio systems and especially on the elements of flexibility residing in the PHYsical layer (PHY). It introduces the various ways in which a reconfigurable transceiver can be used to provide multistandard capabilities, channel adaptivity, and user/service personalization. It describes specific tools developed within two IST projects aiming at such flexible transceiver architectures. Finally, a specific example of a mode-selection algorithmic architecture is presented which incorporates all the proposed tools and, therefore, illustrates a baseband flexibility mechanism.</p
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