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Browsing by Author "Tsiftsis, Theodoros A."

Browsing by Author "Tsiftsis, Theodoros A."

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  • A Joint Tensor Completion and Prediction Scheme for Multi-Dimensional Spectrum Map Construction 
    Tang, Mengyun; Ding, Guoru; Wu, Qihui; Xue, Zhen; Tsiftsis, Theodoros A. (IEEE Access, 2016-11-14)
    Spectrum data, which are usually characterized by many dimensions, such as location, frequency, time, and signal strength, present formidable challenges in terms of acquisition, processing, and visualization. In practice, ...
  • Antenna Beamforming for Energy Harvesting in Cognitive Radio Networks 
    Liu, Huidong; Chen, Jin; Ding, Guoru; Tsiftsis, Theodoros A.; Rowell, Corbett (2016)
    In this paper, a cooperative cognitive radio network (CRN) with energy harvesting capabilities of its secondary users is considered. Specifically, cooperative spectrum sensing and multi-antenna beamforming are employed ...
  • Energy detection based spectrum sensing over enriched multipath fading channels 
    Bagheri, Alireza; Sofotasios, Paschalis C.; Tsiftsis, Theodoros A.; Ho-Van, Khuong; Loupis, Michael I.; Freear, Steven; Valkama, Mikko (Institute of Electrical and Electronics Engineers Inc., 2016-09-12)
    Energy detection has been for long constituting the most popular sensing method in RADAR and cognitive radio systems. The present paper investigates the sensing behaviour of an energy detector over Hoyt fading channels, ...
  • Energy Detection Based Spectrum Sensing over Enriched Multipath Fading Channels 
    Bagheri, Alireza; Sofotasios, Paschalis C.; Tsiftsis, Theodoros A.; Ho-Van, Khuong; Loupis, Michael I.; Freear, Steven; Valkama, Mikko (2016)
    Energy detection has been for long constituting the most popular sensing method in RADAR and cognitive radio systems. The present paper investigates the sensing behaviour of an energy detector over Hoyt fading channels, ...
  • Energy Efficient Switching between Data Transmission and Energy Harvesting for Cooperative Cognitive Relaying Systems 
    Miridakis, Nikolaos I.; Tsiftsis, Theodoros A.; Alexandropoulos, George C.; Debbah, M´erouane (2016)
    A dual-hop cognitive (secondary) relaying system incorporating collaborative spectrum sensing to opportunistically switch between data transmission and energy harvesting is introduced. The secondary relays, first scan ...
  • Energy efficient switching between data transmission and energy harvesting for cooperative cognitive relaying systems 
    Miridakis, Nikolaos I.; Tsiftsis, Theodoros A.; Alexandropoulos, George C.; Debbah, Merouane (Institute of Electrical and Electronics Engineers Inc., 2016-07-12)
    A dual-hop cognitive (secondary) relaying system incorporating collaborative spectrum sensing to opportunistically switch between data transmission and energy harvesting is introduced. The secondary relays, first scan the ...
  • Hierarchical Resource Allocation Framework for Hyper-Dense Small Cell Networks 
    Qiu, Junfei; Ding, Guoru; Wu, Qihui; Qian, Zuping; Tsiftsis, Theodoros A.; Du, Zhiyong; Sun, Youming (IEEE Access, 2016-11-29)
    This paper considers joint power control and subchannel allocation for co-tier interference mitigation in extremely dense small cell networks, which is formulated as a combinatorial optimization problem. Since it is ...
  • On the energy efficiency in multi-user multi-relay coded network 
    Qi, Nan; Xiao, Ming; Tsiftsis, Theodoros A.; Cao, Phuong L.; Skoglund, Mikael; Li, Lixin (Institute of Electrical and Electronics Engineers Inc., 2016-06-27)
    In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the receivers ...
  • On the Energy Efficiency in Multi-user Multi-relay Coded Network 
    Qi, Nan; Xiao, Ming; Tsiftsis, Theodoros A.; Cao, Phuong L.; Skoglund, Mikael; Li, Lixin (2016)
    In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the ...
  • 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 (IEEE Transactions on Vehicular Technology, 2016-05-01)
    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 ...
  • On the Joint Impact of Hardware Impairments and Imperfect CSI on Successive Decoding 
    Miridakis, Nikolaos I.; Tsiftsis, Theodoros A. (IEEE Transactions on Vehicular Technology, 2016)
    In this paper, a spatial multiplexing multiple-input multiple-output (MIMO) system when hardware along with RF imperfections occur during the communication setup is analytically investigated. More specifically, the scenario ...
  • Resource allocation for licensed/unlicensed carrier aggregation MIMO systems 
    Tsinos, Christos G.; Foukalas, Fotis; Tsiftsis, Theodoros A. (Institute of Electrical and Electronics Engineers Inc., 2016-09-12)
    In this paper a novel Carrier Aggregation (CA) scheme is proposed for downlink MIMO LTE-A Systems. The proposed approach achieves increased transmission rates by establishing the communication links via both licensed and ...
  • Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems 
    Tsinos, Christos G.; Foukalas, Fotis; Tsiftsis, Theodoros A. (2016)
    In this paper a novel Carrier Aggregation (CA) scheme is proposed for downlink MIMO LTE-A Systems. The proposed approach achieves increased transmission rates by establishing the communication links via both licensed ...
  • Simultaneous Spectrum Sensing and Data Transmission for Multi-User MIMO Cognitive Radio Systems 
    Miridakis, Nikolaos I.; Tsiftsis, Theodoros A.; Alexandropoulos, George C.; Debbah, M´erouane (2016)
    We present a multi-user multiple-input multipleoutput (MIMO) cognitive radio system consisting of a secondary receiver that deploys spatial multiplexing to decode signals from multiple secondary transmitters, under the ...