This tutorial paper addresses the physical layer security concerns and resiliency of Orthogonal Frequency Division Multiplexing (OFDM) communications; the de facto air-interface of most modern wireless broadband standards including 3GPP Long Term Evolution (LTE) and WiMAX. The paper starts with a brief introduction to the OFDM waveform and then reviews the robustness of the existing OFDM…
Tags: OMNeT++ Projects
UAV-WSN communication algorithm with increased energy autonomy
Nowadays an extensive attention is given to UAVs and their applications. One applications category can be underserved by hybrid systems composed from UAV and ground WSN. UAV can gather data from ground WSN which, at its turn could be initially deployed by the UAV itself. Ground nodes are limited in battery life, therefore, an efficient communication algorithm…
CA-SVM: Communication-Avoiding Support Vector Machines on Distributed Systems
We consider the problem of how to design and implement communication-efficient versions of parallel support vector machines, a widely used classifier in statistical machine learning, for distributed memory clusters and supercomputers. The main computational bottleneck is the training phase, in which a statistical model is built from an input data set. Prior to our study, the…
Software defined synergistic IP+optical resilient transport networks [Invited]
Integrated orchestration of the IP+optical transport network has been well studied in recent years and has become a realistic trend in telecommunication network deployments. OpenFlow-based softwaredefined network architecture is among the emerging and intensively investigated unified control plane solutions. Numerous previous works have focused on enabling optical networks to support the OpenFlow control plane, but mostly discussed from the single controller’s point of view.…
Bootstrapping Software Defined Network for flexible and dynamic control plane management
To improve reliability and performance of Software Defined Networking (SDN) architectures, a number of recent efforts have proposed a logically centralized but physically distributed controller design that overcomes the bottleneck introduced by a single physical controller. Despite these advances, two key problems still persist. First, the task of controlling the host network and the task of controlling the control-plane network remain tightly intertwined,…
Quality of service control and resource prioritization with Software Defined Networking
In this study, we aim to analyze how Software Defined Networking (SDN) can help to ensure a high-quality uninterrupted Voice over Internet Protocol (VoIP) service accompanied by video for prioritized users and entities in a network congested with background traffic. Guaranteeing a level of Quality of Service (QoS) and resource prioritization are key concepts for future networks (e.g, 5G, NGSON) and may be…
PAM: An efficient power-aware multi-level cache policy to reduce energy consumption of Software Defined Network
Nowadays energy consumption is one of the most significant aspects in Internet operations, where multi-level routing is widely used. In a typical hierarchical router cache structure, the upper level storage serves as a cache for the lower level, which forms a distributed multi-level cache system. In the past two decades, several classic LRU-based multi-level cache…
Network Coded Software Defined Networking: Design and Implementation
Software Defined Networking (SDN) and Network Coding (NC) are two key concepts in networkingthat have garnered much attention in recent years. On the one hand, SDN’s potential to virtualize services in the Internet allows a large flexibility not only for routing data, but also to manage buffering, scheduling, and processing over the network. On the other hand, NC has shown great potential…
Multi-failure restoration with minimal flow operations in software defined networks
We consider dynamic flow restoration in multi-failure scenarios in OpenFlow-based Software-DefinedNetworks (SDNs). Flexibility of network configuration in these networks makes it possible to dynamically restore flows in case of multilink failures. To re-route the failed flows, network devices such as switches carry out flow operations, i.e., add new flow-entries to the flow-tables. In disaster scenarios where thousands of flows must be restored in…
A Survey of Security in Software Defined Networks
The proposition of increased innovation in network applications and reduced cost for network operators has won over the networking world to the vision of Software-Defined Networking (SDN). With the excitement of holistic visibility across the network and the ability to program network devices, developers have rushed to present a range of new SDN-compliant hardware, software and services. However, amidst this frenzy of activity, one key element has only recently entered…