10 citations · 10 across the 12 of their papers we have counts for
15 papers
Extreme Level Crossing Rate: A New Performance Indicator for URLLC Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis +2
Level crossing rate (LCR) is a well-known statistical tool that is related to the duration of a random stationary fading process \emph{on average}. In doing so, LCR cannot capture…
Low Complexity Resource Allocation for Massive Carrier Aggregation
Stelios Stefanatos, Fotis Foukalas, Theodoros A. Tsiftsis
Optimal resource allocation (RA) in massive carrier aggregation scenarios is a challenging combinatorial optimization problem whose dimension is proportional to the number of users…
Energy-efficient Traffic Bypassing in LTE HetNets with Mobile Relays
George T. Karetsos, Angelos Rouskas, Fotis Foukalas
One of the core technologies being standardized by 3GPP for LTE-A is the introduction of Relay Nodes (RNs). RNs are intended for ensuring coverage at cell edges as well as for the…
Multi-User Diversity with Optimal Power Allocation in Spectrum Sharing under Average Interference Power Constraint
Fotis Foukalas, Tamer Khattab
In this paper, we investigate the performance of multi-user diversity (MUD) with optimal power allocation (OPA) in spectrum sharing (SS) under average interference power (AIP) cons…
Collision Avoidance in TV White Spaces: A Cross-layer Design Approach for Cognitive Radio Networks
Fotis Foukalas, George Karetsos
One of the most promising applications of cognitive radio networks (CRNs)is the efficient exploitation of TV white spaces (TVWSs) for enhancing the performance of wireless networks…
Interference Cancellation trough Interference Alignment for Downlink of Cognitive Cellular Networks
May Moussa, Fotis Foukalas, Tamer Khattab
In this letter, we propose the interference cancellation through interference alignment at the downlink of cognitive cellular networks. Interference alignment helps the spatial res…
Adaptive Modulation in Multi-user Cognitive Radio Networks over Fading Channels
F. Foukalas, T. Khattab, H. V. Poor
In this paper, the performance of adaptive modulation in multi-user cognitive radio networks over fading channels is analyzed. Multi-user diversity is considered for opportunistic…
On the Performance of Adaptive Modulation in Cognitive Radio Networks
F. Foukalas, G. T. Karetsos
We study the performance of cognitive radio networks (CRNs) when incorporating adaptive modulation at the physical layer. Three types of CRNs are considered, namely opportunistic s…
Packet Relaying Control in Sensing-based Spectrum Sharing Systems
F. Foukalas, T. Khattab, H. V. Poor
Cognitive relaying has been introduced for opportunistic spectrum access systems by which a secondary node forwards primary packets whenever the primary link faces an outage condit…
A Study on Spectral Efficiency of Physical Layer over Cognitive Radio
Fotis Foukalas, Lazaros Merakos
Despite the conclusive potential of cognitive radio for provisioning the dynamic and flexible spectrum/channel allocation, the research community should study the performance gain…
Capacity Optimization through Sensing Threshold Adaptation for Cognitive Radio Networks
Fotis Foukalas, George T. Karetsos, Lazaros Merakos
In this paper we propose the capacity optimization over sensing threshold for sensing-based cognitive radio networks. The objective function of the proposed optimization is to maxi…
Joint optimal power allocation and sensing threshold selection for SUs capacity maximization in SS CRNs
F. Foukalas, P. T. Mathiopoulos, G. T. Karetsos
We propose a joint optimal power allocation and sensing threshold selection for capacity maximization at the secondary user (SU) in spectrum sharing (SS) cognitive radio networks (…
Multi-user Diversity in Spectrum Sharing Systems over Fading Channels with Average Power Constraints
Fotis Foukalas, Tamer Khattab, H. Vincent Poor
The multi-user diversity in spectrum sharing cognitive radio systems with average power constraints over fading channels is investigated. Average power constraints are imposed for…
To Relay or Not To Relay in Cognitive Radio Sensor Networks
Fotis Foukalas, Tamer Khattab
Recent works proposed the relaying at the MAC layer in cognitive radio networks whereby the primary packets are forwarded by the secondary node maintaining an extra queue devoted t…
Adaptive Modulation in OSA-based Cognitive Radio Networks
F. Foukalas, G. T. Karetsos, G. K. Karagiannidis
Opportunistic spectrum access is based on channel state information and can lead to important performance improvements for the underlying communication systems. On the other hand a…