Entity

Time filter

Source Type


Argibay-Losada P.J.,State University of New York at Buffalo | Nozhnina K.,State University of Information and Communication Technologies | Sahin G.,Miami University Ohio | Sahin G.,University of Aveiro | Qiao C.,State University of New York at Buffalo
Proceedings - IEEE INFOCOM | Year: 2014

Due to lack of optical RAM buffers in fast optical switches (FOS), statistical multiplexing technologies using FOS like Optical Burst Switching (OBS) or Optical Packet Switching (OPS) are expected to have higher data losses than conventional electronic networks. Consequently, applications transferring data by means of TCP can suffer from a lower throughput. In this paper, we show that this low-throughput problem is mainly an artifact caused by the conventional TCP congestion control algorithms, and can be remedied by using a simple yet effective stop-and-wait congestion control algorithm instead, as long as the propagation delay between TCP source and TCP destination is small compared to the transmission time of an optical packet. We show that such a condition holds for a wide range of scenarios, including fat-tree-based data center networks. We also show that the throughput achieved in a FOS network using stop-and-wait can be the same as, or higher than that in an equivalent, conventional electronic network. © 2014 IEEE. Source


Gostev V.I.,State University of Information and Communication Technologies
Journal of Automation and Information Sciences | Year: 2010

On the basis of the method of designing fuzzy controllers, described in 1, the elements of the theory and practical circuit of the simplest fuzzy controllers, which can be used in different automatic control systems are given. © 2010 by Begell House Inc. Source


Didkowsky R.M.,Cherkasy State Technological University | Vovchenko A.V.,Cherkasy State Technological University | Bokla N.I.,State University of Information and Communication Technologies
Automatic Control and Computer Sciences | Year: 2013

This work proposes a new method of symbol timing synchronization of communication systems that uses a stochastic carrier. By means of a computer simulation experiment, there was explored the effectiveness of the proposed method. The advantages and disadvantages were shown. © 2013 Allerton Press, Inc. Source


Gostev V.I.,State University of Information and Communication Technologies
Journal of Automation and Information Sciences | Year: 2010

The general energy model of a radio channel with fadings is obtained on the basis of the interactive MATLAB system. The model is built on the basis of the equation of signal transmission from the transmitter to receiver, taking into account signal attenuation, delay and fading in the medium of radio wave propagation The method of removing fadings in the radio control channel is given and the fuzzy-system of automatic control of the transmitter power in the adaptive channel is investigated. © 2010 by Begell House Inc. Source


Argibay-Losada P.J.,University of Vigo | Argibay-Losada P.J.,State University of New York at Buffalo | Nozhnina K.,State University of Information and Communication Technologies | Suarez-Gonzalez A.,University of Vigo | And 2 more authors.
Wireless Networks | Year: 2014

Proportional fairness is a widely accepted form of allocating transmission resources in communication systems. For wired networks, the combination of a simple probabilistic packet marking strategy together with a scheduling algorithm aware of two packet classes can meet a given proportional vector of n loss probabilities, to an arbitrary degree of approximation, as long as the packet loss gap between the two basic classes is sufficiently large. In contrast, for wireless networks, proportional fairness is a challenging problem because of random channel variations and contention for transmitting. In this paper, we show that under the physical model, i.e.; when receivers regard collisions and interference as noise, the same packet marking strategy at the network layer can also yield proportional differentiation and nearly optimal throughput. Thus, random access or interference due to incoherent transmissions do not impair the feasibility of engineering a prescribed end-to-end loss-based proportional fairness vector. We consider explicitly multihop transmission and the cases of Markovian traffic with a two-priority scheduler, as well as orthogonal modulation with power splitting. In both cases, it is shown that sharp differentiation in loss probabilities at the link layer is achievable without the need to coordinate locally the transmission of frames or packets among neighboring nodes. Given this, a novel distributed procedure to adapt the marking probabilities so as to attain exact fairness is also developed. Numerical experiments are used to validate the design. © 2013 Springer Science+Business Media New York. Source

Discover hidden collaborations