تصفح حسب المؤلف "Foukalas, Fotis"
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Distributed power control for carrier aggregation in cognitive heterogeneous 5G cellular networks
Foukalas, Fotis; Khattab, Tamer ( Springer Verlag , 2015 , Conference Paper)In this paper, we study the distributed optimal power allocation for the carrier aggregation in next generation (5G) cognitive radio networks. The presented study relies on the power control and carrier aggregation principles ... -
Energy efficient power allocation for carrier aggregation enabled communications systems
Ropokis, George A.; Foukalas, Fotis ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)The Energy Efficiency (EE) of Carrier Aggregation (CA) enabled communications systems is studied. In more detail, the problem of the optimal power allocation for CA enabled systems exploiting multiple Parallel Frequency ... -
Energy Efficient Spectrum Allocation and Mode Selection for D2D Communications in Heterogeneous Networks
Galanopoulos, Apostolos; Foukalas, Fotis; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2020 , Article)In this paper, we consider a heterogeneous network consisting of both macro Base Station (MBS) and pico Base Stations (PBSs) in order to provide a spectrum allocation and mode selection in device-to-device (D2D) communications. ... -
Energy efficient spectrum allocation and mode selection for mission-critical D2D communications
Apostolos, Galanopoulos; Konstantinos, Kousias; Aikaterini, Nikolaidou; Foukalas, Fotis; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)Device-to-device (D2D) communications is considered as a key enabling technology in future cellular networks and thus, it has become an intriguing topic for research. It refers to an innovative technology that enables User ... -
Multi-user diversity with optimal power allocation in spectrum sharing under average interference power constraint
Foukalas, Fotis; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)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) constraint. In particular, OPA through average ... -
On the Achievable Rates of OFDM with Common Phase Error Compensation in Phase Noise Channels
Stefanatos, Stelios; Foukalas, Fotis; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)This paper considers the problem of analytically assessing the maximum achievable rates (capacity) of orthogonal frequency division multiplexing (OFDM) transmissions when the receiver, for complexity reasons, only accounts ... -
On the Higher Order Statistics of the Channel Capacity in Dispersed Spectrum Cognitive Radio Systems Over Generalized Fading Channels
Tsiftsis, Theodoros A.; Foukalas, Fotis; Karagiannidis, George K.; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Article)This work is devoted to the study of dispersed spectrum cognitive radio (CR) systems over independent and nonidentically distributed (i.n.i.d.) generalized fading channels. More specifically, this is performed in terms of ... -
Optimal power allocation in dispersed cognitive radio systems with carrier aggregation
Foukalas, Fotis; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper, we investigate the optimal power allocation problem in dispersed cognitive radios with carrier aggregation. To this end, we model the carrier aggregation using an i - th frequency diversity policy, wherein ...