Wyniki wyszukiwania dla: channel acces

• IEEE Access

  Czasopisma

  ISSN: 2169-3536

• Performance analysis of standard and modified EY-NPMA channel access algo-rithms

  Publikacja

  • T. Janczak
  • J. Woźniak

  - TELEKOMUNIKACJA CYFROWA. TECHNOLOGIE I USŁUGI - Rok 2003

  Podczas minionego 10-ciolecia notuje się szybki rozwój lokalnych sieci bezprzewodowych (WLANy). Proponowane rozwiązania dotyczą zarówno sieci opartych o przesył komórek (zgodnych z ATM), jak i sieci pakietowych (zgodnych z E-thernetem). Po rozważeniu drugiego z wymienionych typów sieci, wydaje się dzisiaj, iż pakietowe WLANy będą oparte głównie na dwóch standardach, mianowicie: IEEE 802.11 [6]) - wykorzystującym protokół dostępu...

• Purely quantum superadditivity of classical capacities of quantum multiple access channels

  Publikacja

  • Ł. Czekaj
  • P. Horodecki

  - PHYSICAL REVIEW A - Rok 2009

  We are studying classical capacities of quantum memoryless multiaccess channels in geometric terms and we are revealing a break of additivity of the Holevo-like capacity. This effect is a purely quantum mechanical one, since, as we point out, the capacity regions of all classical memoryless multiaccess channels are additive. It is the first such effect revealed in the field of classical information transmission via quantum channels.

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• Handel Wewnętrzny

  Czasopisma

  ISSN: 0438-5403

• Nonadditivity of quantum and classical capacities for entanglement breaking multiple-access channels and the butterfly network

  Publikacja

  • P. Horodecki
  • A. Grudka

  - PHYSICAL REVIEW A - Rok 2010

  We analyze quantum network primitives which are entanglement breaking. We show superadditivity of quantum and classical capacity regions for quantum multiple-access channels and the quantum butterfly network. Since the effects are especially visible at high noise they suggest that quantum information effects may be particularly helpful in the case of the networks with occasional high noise rates. The present effects provide a qualitative...

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• Subadditivity of the minimum output entropy and superactivation of the classical capacity of quantum multiple access channels

  Publikacja

  • Ł. Czekaj

  - PHYSICAL REVIEW A - Rok 2011

  We study subadditivity of the minimum output entropy (Hmin) of quantum multiple access channels (MACs). We provide an example of violation of the additivity theorem for Hmin known in classical information theory. Our result is based on a fundamental property of MACs, i.e., independence of each sender. The channels used in the example can be constructed explicitly. On the basis of subadditivity of Hmin we also provide an example...

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• Quantum superadditivity in linear optics networks: Sending bits via multiple-access Gaussian channels

  Publikacja

  • Ł. Czekaj
  • J. Korbicz
  • R. Chhajlany
  • P. Horodecki

  - PHYSICAL REVIEW A - Rok 2010

  Superadditivity effects of communication capacities are known in the case of discrete variable quantum channels. We describe the continuous variable analog of one of these effects in the framework of Gaussian multiple access channels (MACs). Classically, superadditivity-type effects are strongly restricted: For example, adding resources to one sender is never advantageous to other senders in sending their respective information...

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• Investigation of active channels in multi-channel surface arm EMG recordings for 24 different movements

  Publikacja

  • A. Akgul
  • M. Bedeloglu
  • C. Topcu
  • R. Sever
  • O. Ozkan
  • O. Ozkan
  • H. Uysal
  • O. Polat
  • O. Colak

  - Rok 2014

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• Ubiquity of client access in heterogeneous access environment

  Publikacja

  • K. Gierłowski

  - Journal of Telecommunications and Information Technology - Rok 2014

  With popularization of mobile computing and diverse offer of mobile devices providing functionality comparable to stationary computers, the necessity of providing network access for such users cannot be disputed. The requirement is further reinforced by emergence of general purpose mobile operating systems which provide their full functionality only with network connectivity available and popular XaaS (Anything as a Service) approach....

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• CHANNELS

  Czasopisma

  ISSN: 1933-6950 , eISSN: 1933-6969