Search results for: A. Serdar Tan
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In this demo, we demonstrate the integration of radio access network (RAN)/Software-Defined Networking (SDN) controller with a connectivity management platform designed for mobile wireless networks. This is an architecture designed throughout the EU Celtic-Plus project SIGMONA1. OpenDaylight based RAN/SDN controller and the application server are capable of collecting infrastructure and client related...
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Computer Communications > 2016 > 95 > C > 3-14
The expected boost in mobile data traffic and the evolution towards the next generation of networks are making cellular operators reconsider whether current approaches for handling mobility could be improved, according to the characteristics of the mobile traffic that actually flows through real networks. In this work, we make use of extensive analysis of real network traces to infer the main characteristics...
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Wireless Networks > 2018 > 24 > 4 > 1187-1203
The rapid spread of smart wireless devices and expansion of mobile data traffic have increased the interest for efficient traffic offloading techniques in next-generation communication technologies. Wi-Fi offloading uses ubiquitous Wi-Fi technology in order to satisfy the ever increasing demand for mobile bandwidth and therefore is an appropriate methodology for mobile operators. As a matter of fact,...
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Wireless Fidelity (WiFi) offloading is becoming a dominant use case scenario application of WiFi technology for mobile operators in order to satisfy their subscribers increasing demand for mobile bandwidth. In fact, designing and integrating a convergent infrastructure of 3GPP and non-3GPP networks inside mobile operators that can manage connectivity of their subscribers is a challenging task due...
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Integration of offloading technologies into mobile network operator's infrastructures that provide heterogeneous access services is a challenging task for mobile operators. A connectivity management platform is a key element for heterogeneous mobile network operators in order to enable optimal offloading. In this study, development and integration of a connectivity management platform that uses a...
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Flexible network management solutions for heterogeneous networks have attracted increasing attention for operators in order to meet the today's exponential network traffic demands. Over decades, mobile operators have been developing and deploying new heterogeneous systems into their infrastructures. However, converging the cellular networks with heterogeneous devices such as Carrier Wi-Fi still remains...
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In this paper, a centralized connectivity management platform for Wi-Fi Offloading in heterogeneous wireless networks is developed. To enable this platform, several attributes, such as users' connection details, terminal status and channel utilization, are periodically collected from terminals and network infrastructure, and sent to a remote server called SHARING Server. The server runs a multiple...
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An algorithm on automatic topology discovery in OpenFlow supported software defined networks is proposed. The proposed algorithm utilizing link layer discovery protocol allows to obtain the whole network topology by the network controller. We have validated the successful operation of our algorithm through simulation and real network tests seperately, and shown that it scales linearly.
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We present a closed-form maximum likelihood-based data detection algorithm for long-haul optical channels with dominant nonlinear phase noise induced by self-phase modulation. The closed-form detector is evaluated in terms of symbol error rate as a function of input power, and compared with other sub-optimal detectors as well as a non-parametric detector. We show that the performance of the detector...
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IEEE/OSA Journal of Optical Communications and Networking > 2011 > 3 > 6 > 493 - 501
An algorithm based on independent component analysis for blind polarization demultiplexing in a coherent transmission system is presented. A comparison with the constant modulus algorithm in terms of the convergence properties is performed, and it is found that the suggested algorithm has a significantly faster convergence rate and does not have any singularity problems. We also demonstrate that the...
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Packet Video 2007 > 98 - 104
A near optimal streaming system for stereoscopic video is proposed. Initially, the stereoscopic video is separated into three layers and the approximate analytical model of the Rate-Distortion (RD) curve of each layer is calculated from sufficient number of rate and distortion samples. The analytical modeling includes the interdependency of the defined layers. Then, the analytical models are used...
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The utilization of forward error correction (FEC) schemes for stereo video streaming is investigated. Stereo video is categorized in 3 layers and each layer is protected with different protection ratios for efficient streaming. Systematic Reed-Solomon (RS) and Luby Transform (LT) codes are utilized as the error protection schemes. Detailed simulations are performed in order to observe the optimum...
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In this paper, error resilient stereoscopic video streaming problem is addressed. Two different Forward Error Correction (FEC) codes namely Systematic LT and RS codes are utilized to protect the stereoscopic video data against transmission errors. Initially, the stereoscopic video is categorized in 3 layers with different priorities. Then, a packetization scheme is used to increase the efficiency...
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EURASIP Journal on Advances in Signal Processing > 2003 > 2009 > 1 > 1-14
We consider an error-resilient stereoscopic streaming system that uses an H.264-based multiview video codec and a rateless Raptor code for recovery from packet losses. One aim of the present work is to suggest a heuristic methodology for modeling the end-to-end rate-distortion (RD) characteristic of such a system. Another aim is to show how to make use of such a model to optimally select the parameters...
