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Browsing by Subject "Bandwidth"

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    • Article  

      Adaptive congestion protocol: A congestion control protocol with learning capability 

      Lestas, Marios; Pitsillides, Andreas; Ioannou, Petros A.; Hadjipollas, George (2007)
      There is strong evidence that the current implementation of TCP will perform poorly in future high-speed networks. To address this problem many congestion control protocols have been proposed in literature which, however, ...

    • Conference Object  

      Adaptive feedback algorithm for internet video streaming based on fuzzy rate control 

      Antoniou, Pavlos Ch.; Pitsillides, Andreas; Vassiliou, Vasos (2007)
      It is beyond any doubt that the unpredictable nature of the today's Internet has tremendous impact on the transmission of video streams. With respect to the real-time nature of video streaming, unpredictable band-width, ...

    • Conference Object  

      Adaptive real-time HEVC encoding of emergency scenery video 

      Panayides, Andreas S.; Constantinides, Anthony G.; Pattichis, Marios S.; Kyriacou, Efthyvoulos C.; Pattichis, Constantinos S. (Institute of Electrical and Electronics Engineers Inc., 2015)
      This paper proposes the use of an adaptive HEVC encoding framework for the wireless transmission of real-time emergency scenery video. The goal of the proposed approach is to adapt HEVC encoding methods and parameters so ...

    • Conference Object  

      Addressing network survivability issues by finding the K-best paths through a trellis graph 

      Nikolopoulos, Stavros D.; Pitsillides, Andreas; Tipper, David (IEEE, 1997)
      Due to the increasing reliance of our society on the timely and reliable transfer of large quantities of information (such as voice, data, and video) across high speed communication networks, it is becoming important for ...

    • Article  

      Aggregated bandwidth allocation: Investigation of performance of classical constrained and genetic algorithm based optimisation techniques 

      Pitsillides, Andreas; Stylianou, Georgios; Pattichis, Constantinos S.; Sekercioglu, Y. Ahmet; Vasilakos, Athanasios V. (2002)
      We consider a high speed integrated services network, and investigate compare and contrast the performance of two algorithms for solving the Aggregated Bandwidth Allocation (BA) problem. The algorithms we focus our attention ...

    • Conference Object  

      Antipodal finline-to-microstrip transition for operation in the Ka band 

      Olsen, A. O.; Steenson, P.; Iezekiel, Stavros (2000)

    • Conference Object  

      Bandwidth Allocation for Virtual Paths (BAVP): Investigation of performance of classical constrained and genetic algorithm based optimization techniques 

      Pitsillides, Andreas; Stylianou, Georgios; Pattichis, Constantinos S.; Sekercioglu, Y. Ahmet; Vasilakos, Athanasios V. (2000)
      We investigate the performance of a classical constrained optimization (CCO) algorithm and a constrained optimization Genetic Algorithm (GA) for solving the Bandwidth Allocation for Virtual Paths (BAVP) problem. We compare ...

    • Article  

      Bandwidth and Directivity Enhancement of Loop Antenna by Nonperiodic Distribution of Mu-Negative Metamaterial Unit Cells 

      Rezaeieh, S. A.; Antoniades, Marcos A.; Abbosh, A. M. (2016)
      The theory, design, analysis, and verification of a wideband and unidirectional loop antenna loaded with mu-negative (MNG) metamaterial unit cells is presented. It is shown that by nonperiodic positioning of MNG unit cells ...

    • Conference Object  

      Bandwidth and directivity enhancement of metamaterial-loaded loop antennas for microwave imaging applications 

      Antoniades, Marcos A.; Rezaeieh, S. A.; Abbosh, A. M. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Compact, wideband and unidirectional loop antennas are presented, that are based on a conventional planar loop antenna that is loaded in a mu-negative (MNG) fashion with series capacitors, enabling a mu-zero (MZR) resonance ...

    • Conference Object  

      A broadband 1:4 Series power divider using metamaterial phase-shifting lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A metamaterial 1:4 series power divider that provides equal power split to all four output ports over a large bandwidth Is presented. The divider comprises four non-radiating metamaterial lines In series that can each Incur ...

    • Conference Object  

      A broadband balun using metamaterial phase-shifting lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A 3-port device that converts a single-ended input to a differential output over a large bandwidth is presented. The balun comprises a Wilkinson divider, followed by a +90° negative-refractive-index (NRI) metamaterial (MM) ...

    • Article  

      A broadband series power divider using zero-degree metamaterial phase-shifting lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A metamaterial 1:4 series power divider that provides equal power split to all four output ports over a large bandwidth is presented, which can be extended to an arbitrary number of output ports. The divider comprises four ...

    • Article  

      A broadband Wilkinson balun using microstrip metamaterial lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A metamaterial balun that converts a single-ended input to a differential output over a large bandwidth is presented. The device also exhibits excellent return loss, isolation, and through characteristics over the same ...

    • Article  

      A compact and low-profile metamaterial ring antenna with vertical polarization 

      Qureshi, F.; Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A compact (λ 0/11 footprint) and low-profile (λ 0/28 height) metamaterial ring antenna is proposed using two metamaterial unit cells. Each constituent unit cell consists of negative-refractive-index (NRI) microstrip ...

    • Article  

      Compact cpw-fed planar monopole antenna with wide circular polarization bandwidth 

      Ahdi Rezaeieh, S.; Abbosh, A. M.; Antoniades, Marcos A. (2013)
      The design and implementation of a coplanar waveguide-fed planar monopole antenna with circular polarization and broadband operation is presented. The antenna operates in the Industrial, Scientific, and Medical (ISM) and ...

    • Conference Object  

      A compact crossover using NRI-TL metamaterial lines 

      Antoniades, Marcos A.; Henin, B.; Abbosh, A. M. (2012)
      A compact NRI-TL metamaterial branch-line crossover is presented that has an area of λ/36 × λ/12, and is a factor of 81 times smaller than its analogous transmission-line counterpart. Circuit simulations reveal that it ...

    • Article  

      Compact linear lead/lag metamaterial phase shifters for broadband applications 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2003)
      A compact one-dimensional phase shifter is proposed using alternating sections of negative refractive index (NRI) metamaterials and printed transmission lines (TL). The NRI metamaterial sections consist of lumped element ...

    • Conference Object  

      A compact low-profile high-impedance surface for use as an antenna ground plane 

      Raza, S.; Antoniades, Marcos A.; Eleftheriades, G. V. (2011)
      A compact and low-profile high-impedance surface is proposed which offers a significantly smaller footprint without affecting the usable reflection phase bandwidth of the structure. The unit cell of the proposed surface ...

    • Article  

      Compact Wideband Loop Antenna Partially Loaded With Mu-Negative Metamaterial Unit Cells for Directivity Enhancement 

      Ahdi Rezaeieh, S.; Antoniades, Marcos A.; Abbosh, A. M. (2016)
      A wideband and unidirectional loop antenna partially loaded with mu-negative (MNG) metamaterial unit cells is presented. To reduce the electrical size of the antenna, its first resonance is formed by capacitively loading ...

    • Article  

      Complex-valued tapers 

      Politis, Dimitris Nicolas (2005)
      The spectral estimation method based on the average of short, tapered periodograms is re-examined. The bias of such estimators is typically O(1/b2), where b is the length of the short blocks. Much of the current researeh ...

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