Πλοήγηση ανά Συγγραφέα "Koutsopoulos, I."
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Adaptive channel allocation in OFDM/SDMA wireless LANs with limited transceiver resources
Koutsopoulos, I.; Tassiulas, L. (2004)Smart antennas increase capacity of wireless systems by allowing channel reuse by several users in the same cell through space division multiple access (SDMA). Orthogonal Frequency Division Multiplexing (OFDM) creates ... -
Adaptive channel assignment in SDMA-based wireless LANs with transceiver resource limitations
Koutsopoulos, I.; Tassiulas, L. (2006)Beamforming with adaptive antenna arrays is the most promising means for increasing data rates of wireless systems, since it enables channel reuse by several users in a cell through space division multiple access (SDMA). ... -
An analytic framework for modeling and detecting access layer misbehavior in wireless networks
Radosavac, S.; Moustakides, G.; Baras, J. S.; Koutsopoulos, I. (2008)The widespread deployment of wireless networks and hot spots that employ the IEEE 802.11 technology has forced network designers to put emphasis on the importance of ensuring efficient and fair use of network resources. ... -
Auction mechanisms for network resource allocation
Koutsopoulos, I.; Iosifidis, G. (2010)In the autonomic Internet of the future, auction mechanisms arise as key methods for realizing efficient resource allocation. The major asset of auctions is their obliviousness to node utilities, which renders them capable ... -
Auction-Driven market mechanisms for dynamic spectrum management
Iosifidis, G.; Koutsopoulos, I. (2011)There is nowadays unanimous agreement that spectrum should be allocated in a dynamic fashion so as to match the stochastic supply and demand by responding to spatiotemporal variations of spectrum availability and request. ... -
Carrier assignment algorithms for OFDM-based multi-carrier wireless networks with channel adaptation
Koutsopoulos, I.; Tassiulas, L. (2008)We study carrier assignment in a single-cell multiuser OFDM multi-carrier system so as to satisfy user rate requirements with minimal resources. Different users experience different quality in different carriers due to ... -
Challenges in Auction Theory Driven Spectrum Management
Iosifidis, G.; Koutsopoulos, I. (2011)Dynamic spectrum markets of the future will involve complex spectrum transactions among operators and users. The nontrivial dynamics in channel quality and spatiotemporal spectrum availability call for new ways of spectrum ... -
Challenges in Demand Load Control for the Smart Grid
Koutsopoulos, I.; Tassiulas, L. (2011)The ground to address challenges in demand load control for the smart power grid is now more fertile than ever, due to advances in communication infrastructures and the creation of a two-way channel for real-time communication ... -
Client and server games in peer-to-peer networks
Koutsopoulos, I.; Tassiulas, L.; Gkatzikis, L. (2009)We consider a content sharing network of noncooperative peers. The strategy set of each peer comprises, (i) client strategies, namely feasible request load splits to servers, and (ii) server strategies, namely scheduling ... -
Client-server games and their equilibria in peer-to-peer networks
Koutsopoulos, I.; Tassiulas, L.; Gkatzikis, L. (2014)In peer-to-peer networks, each peer acts simultaneously as client and server, by issuing and satisfying content requests respectively. In this work, we use concepts from non-cooperative game theory to model the interaction ... -
Collaborative placement and sharing of storage resources in the Smart Grid
Gkatzikis, L.; Iosifidis, G.; Koutsopoulos, I.; Tassiulas, L. (2015)The development of low-cost renewable energy generators transforms households into electricity prosumers. Given that generation from renewable sources is highly volatile and does not perfectly match the daily demand pattern ... -
Competition and cooperation in wireless access misbehavior
Koutsopoulos, I. (2011)With the proliferation of access points and terminals, wireless access misbehavior emerges as important means of protocol misuse, whereby network entities aim at obtaining higher channel share than the one in legitimate ... -
Competition and regulation in a wireless operator market: An evolutionary game perspective
Korcak, O.; Iosifidis, G.; Alpcan, T.; Koutsopoulos, I. (2012)We consider a communication market where a set of wireless operators compete over a large common pool of users. The latter have a reservation utility of U0 units or, equivalently, an alternative option to satisfy their ... -
Contention and traffic load-aware association in IEEE 802.11 WLANs: Algorithms and implementation
Keranidis, S.; Korakis, T.; Koutsopoulos, I.; Tassiulas, L. (2011)Efficient association of a station with the appropriate access point has always been a challenging problem. The standard approach of considering only the Received Signal Strength, has recently been substituted by more ... -
Control and optimization meet the smart power grid: Scheduling of power demands for optimal energy management
Koutsopoulos, I.; Tassiulas, L. (2012)The smart power grid harnesses information and communication technologies to enhance reliability and enforce sensible use of energy through effective management of demand load. We envision a scenario with real-time ... -
Cross-layer adaptive techniques for throughput enhancement in wireless OFDM-based networks
Koutsopoulos, I.; Tassiulas, L. (2006)Although independent consideration of layers simplifies wireless system design, it is inadequate since: 1) it does not consider the effect of co-channel user interference on higher layers; 2) it does not address the impact ... -
Cross-layer design for power efficiency and QoS provisioning in multi-hop wireless networks
Kozat, U. C.; Koutsopoulos, I.; Tassiulas, L. (2006)In recent years, it has become common consensus that independent consideration of communication layers often turns out to be inadequate in terms of providing the desired quality of service (QoS) and power efficiency in ... -
Cross-testbed experimentation using the Planetlab-NITOS federation
Makris, N.; Keranidis, S.; Giatsios, D.; Korakis, T.; Koutsopoulos, I.; Tassiulas, L.; Rakotoarivelo, T.; Parmentelat, T. (2012)Federation of network testbeds has been identified as a key goal in the experimental testbeds community, leading to a recent activity burst in this research field. In this demo, we describe a federated experiment between ... -
Demo: Enabling AGILE spectrum adaptation in commercial 802.11 WLAN deployments
Keranidis, S.; Chounos, K.; Korakis, T.; Koutsopoulos, I.; Tassiulas, L. (2014)In this work, we present the AGILE Spectrum Adaptation system that is able to dynamically tune the channel central frequency and bandwidth of wireless links in an adaptive to the interference and trafic conditions way. The ... -
Demo: Online energy consumption monitoring of wireless testbed infrastructure through the NITOS EMF framework
Keranidis, S.; Kazdaridis, G.; Passas, V.; Korakis, T.; Koutsopoulos, I.; Tassiulas, L. (2013)Development of energy-efficient protocols and algorithms requires in-depth understanding of the power consumption characteristics of real world devices. To this aim, energy efficiency analysis is performed by the research ...