Conference Papers

118. X. Mu, H. Liu, A.-A. A. Boulogeorgos, T. A. Tsiftsis, W.-J. Wang, "Integrated Channel Estimation and Phase Optimization in RIS-Assisted MIMO Network: an End-to-End Deep Learning Approach," 2025 IEEE PIMRC, 1–4 September 2025, Istanbul, Turkey.

117. F. Filippou, F. Foukalas, and T. A. Tsiftsis, "Edge deep learning for low capabilities devices," 2025 8th International Balkan Conference on Communications and Networking (Balkancom)

116. W. Zeng and T. A. Tsiftsis, "Performance of Optical Wireless Communications with Spatial Diversity over Fisher-Snedecor Turbelence Channels," icWCSN 2025, 11-13 April, Shenzhen, China. [Best Paper Award]

1145 T. He, and T. A. Tsiftsis, "On the Ergodic Rate of CR-Aided Multi-User Uplink RSMA and NOMA," icWCSN 2025, 11-13 April, Shenzhen, China. 

114. I. Chrysovergis, S. E. Trevlakis, D. Kleitsas, A.-A. A. Boulogeorgos, T. A. Tsiftsis, D. Niyato, "A Digital Twin Based Reconfigurable Intelligent Surface Phase Adaptation Using Spiking Reinforcement Learning Policy Optimization,"2025 IEEE International Conference on Machine Learning for Communication and Networking (ICMLCN): Demos, 26–29 May 2025 // Barcelona, Spain. 

113. H. Rajahrajasingh, D. N. K. Jayakody, M. Palanivel, C. Nathan, and T. A. Tsiftsis, "Dual-Channel OOK (D-COOK) Modulation for UAV-Assisted Mixed THz/VLC Systems," IEEE ICC, Workshop on Cooperative Communications and Computations in Space-Air-Ground-Sea Integrated Networks, Montreal, Canada, 8–12 June 2025.

112. H. Rajahrajasingh, D. N. K. Jayakody, and T. A. Tsiftsis, "Dual-Hop Hybrid Communication for Underwater and Terrestrial Systems: A Study on VLC and RF/FSO/THz ," IEEE ICC, Workshop on Cooperative Communications and Computations in Space-Air-Ground-Sea Integrated Networks, Montreal, Canada, 8–12 June 2025.

111. H. Liu, N. Qi, X. Li, A.-A. Boulogeorgos, T. A. Tsiftsis, M. Xiao, and J. Roning, "IRS Channel Estimation in Cell-free MIMO Network: A Coalition Formation Guided Federated Learning Approach ," IEEEWCNC, Milan, Italy, 24–27 March 2025.

110. E. Koutsonas, A. -A. A. Boulogeorgos, S. E. Trevlakis, T. Ali and T. A. Tsiftsis, "Modeling Blockage in High Directional Wireless Systems," 2024 IEEE Virtual Conference on Communications (VCC), NY, USA, 2024, pp. 1-6, 

109. M. A. Vázquez, S. Barrachina-Muñoz, Mauro Di Si, F. Foukalas, B. Garrido, G. Giambene, M. Hadji, H. Khalili, J. Mangues-Bafalluy, S. Nasirian, M. Santos, L. Santilli, T. A. Tsiftsis, M. Viali, "5G-GOVSATCOM: 5G EU-GOVSATCOM Nonterrestrial Networks for Humanitarian Connectivity ," IEEE IHTC, Bari, Italy / November 27-30, 2024.

108. C. Tsakos, F. Foukalas, and T. A. Tsiftsis, "Joint Resource Allocation and Link Adaptation for Beyond 5G Time Sensitive Communications," 2024 IEEE Conference on Standards for Communications and Networking (CSCN), 25–27, Belgrade, Serbia, November 2024. [Best Paper Award]

107. L. Tlebaldiyeva, S. Arzykulov, A.-A. A. Boulogeorgos, T. A. Tsiftsis, and G. Nauryzbayev, "Fluid Antenna Wireless Systemsfor Enhanced Spectrum Sensing," IEEE GLOBECOM, Cape Town, South Africa, 8–12 December 2024.

106. V. Kouvakis, S. E. Trevlakis, A.-A. A. Boulogeorgos, H. Liu, T. A. Tsiftsis, and O. A. Dobre, "Markov Chain-based Model of Blockchain Radio Access Networks," 2024 IEEE 29th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), 21–23 October 2024 // Athens, Greece.

105. S. E. Trevlakis, M. Belesioti, H. Koumaras, A.-A. A. Boulogeorgos, I. Chochliouros, and T. A. Tsiftsis, "An Innovative Architectural BlueprintTowards Sustainable 6G Systems," 2024 IEEE 29th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), 21–23 October 2024 // Athens, Greece.

104. Y. Rong, T. A. Tsiftsis, and A.-A. A. Boulogeorgos, "Enhanced Covertness with Relay Selection over Nakagami-m Fading Channel" 2024 IEEE/CIC International Conference on Communications in China (ICCC), 7–9 August 2024, Hangzhou, China.

103. V. Kouvakis, S. E. Trevlakis, A.-A. A. Boulogeorgos, T. A. Tsiftsis, K. Signh, and N. Qi, " When Sign Language Meets Semantic Communications" IEEE IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2–5 September 2024, Valencia, Spain.

102. L. He, Y. Chen, M. Wen, and T. A. Tsiftsis, "Multi-Vehicle Collaborative Sensing in RSMA-Assisted ISAC Systems," IEEE International Conference on Communications, 10th Workshop on Integrated Sensing and Communications for 6G,  9–13 June 2024 // Denver, CO, USA.

101. P. Tennakoon, D. N. K. Jayakody, A.-A. A. Boulogeorgos, T. A. Tsiftsis, and C.-P. Li, "Multi-User Connectivity: Advanced User Grouping in RF/VLC Systems with SLIPT for Cooperative NOMA Networks," IEEE International Conference on Communications, Workshop on Industrial Private 5G-and-beyond Wireless Networks,  9–13 June 2024 // Denver, CO, USA.

100. S. Kurma, K. Singh, S. Mumtaz, T. A. Tsiftsis, C.-P. Li, “ML-Driven Resource Optimization in Active-Star-RIS-Aided THz ISAC Systems with DDA Modulation,” IEEE International Conference on Communications, 9–13 June 2024 // Denver, CO, USA.

99. S. Kurma, K. Singh, V. Bhatia, C.-P. Li, T. A. Tsiftsis, “Active RIS-assisted CFm-MIMO with User Mobility and Constrained Fronthaul Capacity,” IEEE International Conference on Communications, 9–13 June 2024 // Denver, CO, USA.

98. P. Chen, F. Xiao, L. Yang, T. A. Tsiftsis, and H. Liu, “Covert Beamforming Design for Active RIS-Assisted NOMA-ISAC Systems,” 2023 IEEE Globecom: 8th Workshop on Integrated Sensing and Communications for Internet of Things, Kuala Lumpur, Malaysia, 4-8 Dec. 2023.

97. J. Tian, W. Gan, X. Li, T. A. Tsiftsis, and H. Liu, “An Efficient Learning Algorithm for Phase Shift Optimization in RIS-Aided MISO Wireless Systems,” WCSP 2023, November 2-4, 2023, Hangzhou, China.

96. V. Sharma, R. Allu, K. Singh, T. A. Tsiftsis,“RIS-aided SWIPT Green Communications Under Imperfect CSI,” IEEE GLOBECOM 2023, 4–8 Dec. 2023, Kuala Lumpur, Malaysia.

95. P. Sonia, M. V. Katwe, K. Singh, T. A. Tsiftsis, and C.-P. Li,“Robust Design of RIS-aided Full-Duplex RSMA System for V2X communication: A DRL Approach,” IEEE GLOBECOM 2023, 4–8 Dec. 2023, Kuala Lumpur, Malaysia.

94. P. Saikia,A. Jee, K. Singh,Cunhua Pan, T. A. Tsiftsis, and W.-J. Huang ,“RIS-Aided Integrated Sensing and Communications,” IEEE GLOBECOM 2023, 4–8 Dec. 2023, Kuala Lumpur, Malaysia.

93. W. Guan, J. Tian, T. A. Tsiftsis, and C. Pan, “Deep Learning-based Joint Transmit and Reflective Beamforming Design for IRS-Aided MISO Multiuser Systems Under Statistical CSI,” IEEE/CIC, Dalian, China, 10–12 August 2023,

92. Z. Shi, X. Wu, L. Yang, Y. Zhan, and T. A. Tsiftsis, “Detection Characteristics and Error Performance Analysis of High-Speed Laser PPM Communication Systems with an Single-pixel SNSPD,” 28th OptoElectronics and Communications Conference, Shanghai, China, July 2-6, 2023. 

91. L. Tlebaldiyeva, S. Arzykulov, T. A. Tsiftsis, and Galymzhan Nauryzbayev, “Full-Duplex Cooperative NOMA-based mmWave Networks with Fluid Antenna System (FAS) Receivers,” BalkanCom 2023, Istanbul, Türkiye, June 5-8, 2023.- Best Paper Award

90. G. Tolebi, T. A. Tsiftsis, and G. Nauryzbayev, “Two-Step Deep Reinforcement Q-Learning based Relay Selection in Cooperative WPCNs,” BalkanCom 2023, Istanbul, Türkiye, June 5-8, 2023.

89. C. Tsinos, T. A. Tsiftsis, and R. Schober, “Symbol level precoding in the RF domain for low hardware complexity RIS-assisted MU-MISO Systems,” IEEE ICASSP 2023, 4-10 June 2023, Rhodes Island, Greece.

88. Y. Li, Y. Chen, M. Wen, D. Zhang, B. Jiao, Z. Ding, T. A. Tsiftsis, and H. V. Poor, “Reconfigurable Intelligent Surface Aided Full Duplex Networking Systems,” IEEE ICC 2023, 28 May – 01 June 2023, Rome, Italy.

87. S. Kurma, K. Singh, P. K. Sharma, C.-P. Li, and T. A. Tsiftsis, “Uplink Cell-Free Massive MIMO URLLC Systems with User Mobility and Imperfect CSI,” IEEE ICC 2023, 28 May – 01 June 2023, Rome, Italy.

86. M. SenthilKumar, A. Dadlani, M. Moradian, B. Maham, and T. A. Tsiftsis, “Age of Information in Multi-Source Updating Systems: An M/G/1 Vacation Queueing Model,” IEEE ICC 2023, 28 May – 01 June 2023, Rome, Italy.

85. N. Qi, Y. Huang, W. Sun, S. Jin, T. A. Tsiftsis, Q. Wu, X. Su, “Unity makes strength: Coalition Formation-based Group-buying for Timely UAV Data Collection,” IEEE GLOBECOM 2022, 4–8 Dec. 2022, Rio de Janeiro, Brazil.

84. M. H. N. Shaikh, K. Rabie, X. Li, T. A. Tsiftsis, and G. Nauryzbayev, “On the Performance of Dual RIS-assisted V2I Communication under Nakagami-m Fading,” IEEE VTC2022-Fall, London/Beijing, 26-29 Sept. 2022.

83. M. Makin, K. Dautov, M. Hashmi, T. A. Tsiftsis, and G. Nauryzbayev, “Outage Analysis and Realization Challenges of RIS-enabled Underlay CR Networks over Nakagami-m Fading,” ICTC 2022, 19–21 Oct. 2022, Jeju island, South Korea.

82. H. Liu, Y. Ye, Z. Bai, K. J. Kim, and T. A. Tsiftsis, “Rate Splitting Multiple Access Aided Mobile Edge Computing in Cognitive Radio Networks,” IEEE  ICC 2022, 16–20 May 2022, Seoul, South Korea.

81. L. Tlebaldiyeva, G. Nauryzbayev, S. Arzykulov, A. Eltawil, and T. A. Tsiftsis, “Enhancing QoS Through Fluid Antenna Systems over Correlated Nakagami-m Fading Channels,” IEEE  WCNC 2022, 10–13 April 2022, Austin, TX, USA

80. F. Foukalas, A. Tziouvaras, and T. A. Tsiftsis, “An Overview of Enabling Federated Learning over Wireless Network,” IEEE MeditCom 2021, Athens, Greece, 7-10 September 2021.

79. Y. Akhmetkaziyev, G. Nauryzbayev, S. Arzykulov, A. M. Eltawil, and T. A. Tsiftsis, "Coverage Analysis of CR-based Satellite-Terrestrial NOMA Networks with Practical System Impairments," IEEE International Conference on Communications, Montreal, Canada, 14-23 June 2021.

78. R. Yao, D. Song, L. Yao, T. A. Tsiftsis, N. I. Miridakis , N. Qi, X. Zuo, and D. Lou, "User Pair-Relay Matching in a Multiple User Pair and Multiple Untrusted Relay Network," WCSP, Nanjing, China October 21-23, 2020.

77. N. Qi, M. Wang, W. Wang, W.-J. Wang, T. A. Tsiftsis, R. Yao, and G. Yang, “Energy Efficient Two-Way Full-duplex UAV Relaying Networks Under Imperfect Channel State Information,” VTC2020-Fall, Victoria, BC Canada, 4-7 October, 2020.

76. O Omarov, S. Arzykulov, G. Nauryzbayev, and T. A. Tsiftsis, “Hardware-Limited Cooperative SWIPT-enabled NOMA Networks,” CSNDSP 2020,  Porto, Portugal, 20-22 July, 2020. 

75. S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis, B. Maham, M. S. Hashmi,  K. M. Rabie, “Underlay Spectrum Sharing for NOMA Relaying Networks: Outage Analysis,” ICNC' 2020,  Big Island, Hawaii, February 17-20, 2020. 

74. S. Arzykulov, G. Nauryzbayev, B. Maham, T. A. Tsiftsis and K. M. Rabie, “Wireless Powered Cognitive Relay Networks: Outage Analysis,” ICSPCS' 2019, Surfers Paradise, Australia 16-18 December 2019.

73. Z. Shi, T. A. Tsiftsis, W. Tan, G. Yang, S. Ma, and M.-S. Alouini, “EffectiveCapacity Analysis for VR-HARQ Systems,” IEEE/CIC International Conference on Communications in China, 11-13 August 2019, Changchun, China.

72. N. I. Miridakis , S. Arzykulov , T. A. Tsiftsis, G. Yang,  and G. Nauryzbayev, "Green CR-NOMA: A New Interweave Energy Harvesting Transmission Scheme for Secondary Access," ISWCS 2019, Oulu, Finland, 27-30 August 2019.

71. R. Yao, Y. Zhang, N. Qi, N. I. Miridakis, and T. A. Tsiftsis, and Y. Liu, "Machine Learning-Based Antenna Selection in Untrusted Relay Networks," 2nd International Conference on Artificial Intelligence and Big Data (ICAIBD 2019), Chengdu, China, May 25-28, 2019.

70. N. Qi, N. I. Miridakis, T. A. Tsiftsis, and R. Yao, "On the Fundamental Queue Analysis for Relay-assisted Two-stage Communication Networks," IEEE WCNC 2019, Advanced 5G Radio Access Networks Features and Performance Workshop, Marrakech, Morocco, 15-19 April, 2019.

69. H. Liu, T. A. Tsiftsis, K. J. Kim, K. S. Kwak, and H. V. Poor, "Rate Splitting for Asynchronous Uplink NOMA Systems with Cyclic Prefixed Single Carrier," 5th International Workshop on Non-Orthogonal Multiple Access Techniques for 5G (NOMA5G), IEEE ICC, Shanghai, China, May 20-24, 2019.

68. K. J. Kim, H. Liu, M. D. Renzo, T. A. Tsiftsis, P. V. Orlik, and H. V. Poor, "Outage Analysis of Distributed CDD Systems with Mixture Interference" IEEE ICC, Shanghai, China, May 20-24, 2019.

67. H. Wu, Y. Zou, J. Zhu, X. Xue, and T. A. Tsiftsis, ``Secrecy Performance of Hybrid Satellite-Terrestrial Relay Systems with Hardware Impairments '' IEEE ICC, Shanghai, China, May 20-24, 2019.

66. S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis and M. Abdallah, ``Outage Performance of Underlay CR-NOMA Networks'' International Conference on Wireless Communications and Signal Processing (WCSP), Hangzhou, Zhejiang, China, October 18-20, 2018.

65. L. Tlebaldyeva, T. A. Tsiftsis, and B. Maham, “Spectrum Sensing Using Improved Energy Detector Under Transceiver Hardware Impairments,” IEEE DySPAN 2018, Seoul, Korea, October 22-24, 2018.

64. H. Liu, N. I. Miridakis, T. A. Tsiftsis, K. Jin Kim, and K. S. Kwak, “Coordinated Uplink Transmission for Cooperative NOMA Systems,” IEEE Global Communications Conference, 9-13 December 2018, Abu Dhabi, UAE.

63. S. Arzykulov, T. A. Tsiftsis, G. Nauryzbayev, and M. Abdallah, “Outage Performance of Underlay CR-NOMA Networks with Detect-and-Forward Relaying”, IEEE Global Communications Conference, 9-13 December 2018, Abu Dhabi, UAE.

62. L. Tlebaldiyeva and T. A. Tsiftsis, "Underlay Cognitive Radio with Imperfect Transceiver Electronics under Nakagami-m Fading", 2nd International Conference on Computing and Network Communications (CoCoNet'18), Astana, Kazakhstan, August 2018 [Best Paper Award].

61. G. Liu, R. Wang, H. Zhang, W. Kang, T. A. Tsiftsis, V. C.M. Leung, "Resource Allocation for Energy-Efficient NOMA Network Based on Super-Modular Game," IEEE ICC 2018 Workshop - 3rd International Workshop on Non-Orthogonal Multiple Access Techniques for 5G

60. N. I. Miridakis, T. A. Tsiftsis, D. D. Vergados, and A. Michalas, "A New Two-Stage Multiuser MIMO Detection Approach with Different Priorities," IEEE ICC 2018 Workshop - 5G ULTRA DENSE NETWORKS (5G-UDN)

59. S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis, and M. Abdallah,"Performance of Cooperative Underlay CR-NOMA Networks over Nakagami-m Channels," IEEE ICC 2018 Workshop - 3rd International Workshop on Non-Orthogonal Multiple Access Techniques for 5G.

58. N. I. Miridakis, T. A. Tsiftsis, G. Alexandropoulos, ``Energy Efficient Transmission in Underlay Massive MIMO Systems with Probabilistic Guarantees," IEEE ICC 2018 Workshop - IEEE Workshop on Energy Harvesting Wireless Communications, Kansas, USA.

57. J. Ghosh, D. N. K. Jayako dy, M. Qaraqe, and T. A. Tsiftsis, Coverage Probability Analytics by Fractional Frequency Reuse Scheme," ITELCON 2017, Istanbul, Turkey.

56. A. Basgumus, M. Namdar, and T. A. Tsiftsis, "Broadcast Underlay Cognitive Radio with Dirty Paper Coding over Fading Channels," IEEE ELECO 2017, Bursa, Turkey

55. S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis and M. Abdallah, “On the Capacity of Wireless Powered Cognitive Relay Network with Interference Alignment” IEEE Globecom 2017, Singapore.

54. S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis and M. Abdallah, “Error Performance of Wireless Powered Cognitive Relay Networks with Interference Alignment” PIMRC 2017, Montreal, Canada.

53. N. Qi, M. Xiao, T. A. Tsiftsis, L. Zhang, M. Skoglund, and H. Zhang, "Efficient Network-Coded Relaying Systems with Energy Harvesting and Transferring, " IEEE ICC 2017, Paris, France.

52. J. Bao, Z. Ma, M. Xiao, T. A. Tsiftsis, and Z. Zhu, "Performance Analysis of Uplink Sparse Code Multiple Access with Iterative Multiuser Receiver, "IEEE ICC 2017, Paris, France.

51. H. Wang, J. Wang, G. Ding, L. Wang, T. A. Tsiftsis, and P. K. Sharma, "Resource Allocation for the Energy Harvesting-Powered D2D Communication Underlaying Cellular Networks, " IEEE ICC 2017, Paris, France.

50. N. I. Miridakis, M. Xia, and T. A. Tsiftsis, "Optimal Power Allocation and Active Interference Mitigation for Underlay MIMO Cognitive Systems,” IEEE ICC 2017, Paris.

49. N. I. Miridakis, T. A. Tsiftsis, G. C. Alexandropoulos, and M. Debbah, "Simultaneous Spectrum Sensing and Data Transmission for Multi-User MIMO Cognitive Radio Systems," IEEE GLOBECOM 2016, Washington DC, USA, December 2016.

48. G. Nauryzbayev, S. Arzykulov, E. Alsusa, and T. A. Tsiftsis, "A Closed-form Solution to Implement Interference Alignment and Cancellation Scheme for the MIMO Three-user X-channel Model," 10th International Conference on Signal Processing and Communication Systems, ICSPCS’2016, Gold Coast, Australia, December 2016.

47. G. Nauryzbayev, S. Arzykulov, E. Alsusa, and T. A. Tsiftsis, " An Alignment-based Interference Cancellation Scheme for Network-MIMO Systems,"10th International Conference on Signal Processing and Communication Systems, ICSPCS’2016, Gold Coast, Australia, December 2016.

46. N. Qi, M. Xiao, T. A. Tsiftsis, P. L. Cao, M. Skoglund, and L. Li, "On the Energy Efficiency in Multi-user Multi-Relay Coded Network " ICT 2016, Thessaloniki, Greece, May 2016.

45. N. I. Miridakis, T. A. Tsiftsis, G. C. Alexandropoulos, and M. Debbah, "Energy Efficient Switching between Data Transmission and Energy Harvesting for Cooperative Cognitive Relaying Systems," IEEE ICC 2016, Kuala Lumpur, Malaysia, May 2016.

44. C. G. Tsinos, F. Foukalas, and T. A. Tsiftsis, "Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems," IEEE WCNC 2016, Doha Qatar, April 2016.

43. A. Bagheri, P C. Sofotasios, T. A. Tsiftsis, K. Ho-Van, M. I. Loupis, S. Freear, and M. Valkama, "Energy Detection Based Spectrum Sensing over Enriched Multipath Fading Channels, " IEEE WCNC 2016, Doha Qatar, April 2016.

42. H. Liu, J Chen, G. Ding, T. A. Tsiftsis, and C. Rowell, "Antenna Beamforming for Energy Harvesting in Cognitive Radio Networks, " IEEE IWS, Shanghai, China, March 2016.

41. A. Bagheri, P. C. Sofotasios, T. A. Tsiftsis, A. Shahzadi, S. Freear, and M. Valkama, "Area under ROC Curve of Energy Detection over Generalized Fading Channels," PIMRC 2015, Hong Kong, China, September 2015.

40. C. G. Zogogianni, D. Voglitsis, S. Saridakis, S. P. Syrigos, Stylianos N. P. Papanikolaou, A. Kyritsis, M. Loupis, T. A. Tsiftsis, and E. C. Tatakis, "Investigation of a Waste Heat Recovery System for a more electric ship, " 17th Power Electronics and Applications (EPE'15 ECCE-Europe), pp.1-10, 8-10 Sept. 2015.

39. A. Galanopoulos, T. A. Tsiftsis, and F. Foukalas, "Licensed Assisted Access: Key Enabling Functionalities and Initial Results," ISWCS' 2015, June 2015.

38. A.-A. A. Boulogeorgos, G. D. Ntouni, D. S. Karas, T. A. Tsiftsis, F. Foukalas, G. K. Karagiannidis, and C. Thomos, "MIMO Link Adaptation with Carrier Aggregation in LTE-A Heterogeneous Networks," European Conference on Networks and Communications (EuCNC 2015), June 2015.

37. P. K. Sharma, A. Bansal, P. Garg, T. A. Tsiftsis, and R. Barrios, «Performance of FSO Links under Exponentiated Weibull Turbulence Fading with Misalignment Errors,” IEEE International Conference on Communications (ICC), June 2015.

36. G. Zhu, C. Zhong, H. A. Suraweera, G. K. Karagiannidis, Z. Zhang, and T. A. Tsiftsis, «Wireless Powered Dual-Hop Multiple Antenna Relay Transmission in the Presence of Interference,” IEEE International Conference on Communications (ICC), June 2015.

35. A. Bagheri, P. C. Sofotasios, T. A. Tsiftsis, A. Shahzadi, and M. Valkama, «AUC Study of Energy Detection Based Spectrum Sensing over η−μ and α−μ Fading Channels,” IEEE International Conference on Communications (ICC), June 2015.

34. A. Bagheri, P. C. Sofotasios, T. A. Tsiftsis, A. Shahzadi, and M. Valkama «Spectrum Sensing in Generalized Multipath Fading Conditions Using Square-Law Combining,” IEEE International Conference on Communications (ICC), June 2015.

33. G. D. Ntouni, A.-A. A. Boulogeorgos, D. S. Karas, T. A. Tsiftsis, F. Foukalas, V. M. Kapinas, G. K. Karagiannidis, "Inter-band Carrier Aggregation in Heterogeneous Networks: Design and Assessment," ISWCS’ 2014, Barcelona, Spain.

32. P. C. Sofotasios, M. Valkama, T. A. Tsiftsis, Y. A. Brychkov, S. Freear, and G. K. Karagiannidis, "Analytic Solutions to a Marcum Q−Function-Based Integral and Application in Energy Detection of Unknown Signals over Multipath Fading Channels," CROWNCOM 2014, 9th International Conference on Cognitive Radio Oriented Wireless Networks, Oulu, Finland.

31. T. Q. Duong, T. T. Duy, M. Matthaiou, T. Tsiftsis, G. K. Karagiannidis, "Cognitive cooperative networks in dual-hop relaying asymmetric fading channels, " IEEE Global Communications Conference (GLOBECOM), Atlanta, GA, December 2013.

30. P. C. Sofotasios, T. A. Tsiftsis, K. H. Van, S. Freear, L. R. Wilhelmsson, M. Valkama, "The κ-μ/IG Composite Statistical Distribution in RF and FSO Wireless Channels," to appear IEEE Vehicular Technology Conference (VTC 2013-Fall), Las Vegas, USA.

29. P. C. Sofotasios, T. A. Tsiftsis, M. Ghogho, L. R. Wilhelmsson and M.Valkama, "The eta-mu/IG Distribution: A Novel Physical Multipath /Shadowing Fading, " in Proc. IEEE International Conference on Communications (ICC), Budapest, Hungary, June 2013., Budapest, Hungary.

28. F. R. V. Guimaraes, D. B. da Costa, M. Benjillali, T. A. Tsiftsis, and G. K. Karagiannidis, "Best Relay Selection in Cooperative Spectrum Sharing Systems with Multiple Primary Users," in Proc. IEEE International Conference on Communications (ICC), Budapest, Hungary, June 2013., Budapest, Hungary.

27. K. J. Kim, T. Q. Duong, T. A. Tsiftsis, and V. N. Q.Bao, "Cognitive Multihop Networks in Spectrum Sharing Environment with Multiple Licensed Users," in Proc. IEEE International Conference on Communications (ICC), Budapest, Hungary, June 2013., Budapest, Hungary.

26. F. Yang, J. Cheng, and T. A. Tsiftsis, "Free-Space Optical Communications with Generalized Pointing Errors, " in Proc. IEEE International Conference on Communications (ICC), Budapest, Hungary, June 2013, Budapest, Hungary.

25. M. Seyfi, S. Muhaidat, J. Liang and T. A. Tsiftsis, "Noncoherent relay selection for bidirectional cooperative networks," IEEE Globecom 2012 Workshops (GC Wkshps), pp.105-110, 3-7 Dec. 2012.

24. Trung Q. Duong, H. A. Suraweera, T. A. Tsiftsis, H.-J. Zepernick, and A. Nallanathan. "OSTBCS in MIMO AF Relay Systems with Keyhole and Correlation Effects," in Proc. IEEE International Communications Conference (ICC’11), Kyoto, Japan, 2011.

23. K. J. Kim, T. A. Tsiftsis and G. K. Karagiannidis, "Average Spectral Efficiency of Opportunistic QRD-based Cyclic Prefixed Single-Carrier Cooperative Diversity Systems with Power Allocation," in Proc. IEEE Globecom 2010 - Wireless Communications Symposium, Miami, Florida, 6–10 December 2010.

22. K. J. Kim, T. A. Tsiftsis and G. K. Karagiannidis, "Average Rate and Outage Probability of Cyclic Prefixed Single-Carrier Opportunistic Cooperative Diversity Systems," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, 26 – 29 September 2010.

21. T. Q. Duong, H-J. Zepernick, T. A. Tsiftsis, V. N. Q. Bao, "Performance Analysis of Amplify-and-Forward MIMO Relay Networks with Transmit Antenna Selection over Nakagami-m Channels," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, 26 – 29 September 2010.

20. T. A. Tsiftsis, Z. Hadzi-Velkov, G. K. Karagiannidis, and N. Zlatanov, "Relaying Utilization Metrics and Application in Diamond Cooperative Systems," in Proc. International Symposium on Wireless Pervasive Computing (IEEE ISWPC), Modena, Italy, 2010.

19. T. Q. Duong, H-J. Zepernick, T. A. Tsiftsis, V. N. Q. Bao, "Amplify-and-Forward MIMO Relaying with OSTBC over Nakagami-m Fading Channels," in Proc. IEEE ICC 2010, Cape Town, South Africa.

18. H. Suraweera, T. A. Tsiftsis and G. K. Karagiannidis, "Effect of Feedback Delay on Downlink Amplify-and-Forward Relaying with Beamforming," in Proc. IEEE Globecom 2009, Hawaii, USA.

17. N. D. Chatzidiamantis, M. Uysal, T. A. Tsiftsis, and G. K. Karagiannidis, "EM-Based Maximum-Likelihood Sequence Detection for MIMO Optical Wireless Systems," in Proc. IEEE ICC'09, Dresden, Germany, June 2009.

16. T. A. Tsiftsis, H. G. Sandalidis, G. K. Karagiannidis, and M. Uysal, "FSO Links with Spatial Diversity over Strong Atmospheric Turbulence Channels," in Proc. IEEE IEEE International Conference on Communications (ICC’08), Beijing, China, May 2008.

15. D. S. Michalopoulos, G. K. Karagiannidis and T. A. Tsiftsis, "Introducing PHY-Layer Fairness in Amplify and Forward cooperative diversity systems," in Proc. IEEE International Conference on Communications 2007 (ICC'07), 24-27 June 2007, Glasgow, Scotland, U.K.

14. P. S. Bithas, N. C. Sagias, T. A. Tsiftsis, and G. K. Karagiannidis, "Products and ratios of two Gaussian class correlated Weibull random variables," in Proc. The 12th International Conference on Applied Stohastic Models and Data Analysis (ASMDA 2007), Chania, Crete, Greece, May 2007.

13. P. S. Bithas, N. C. Sagias, T. A. Tsiftsis, and George K. Karagiannidis, "Distributions involving correlated generalized gamma variables," in Proc. The 12th International Conference on Applied Stohastic Models and Data Analysis (ASMDA 2007), Chania, Crete, Greece, May 2007.

12. D. S. Michalopoulos, G. K. Karagiannidis, T. A. Tsiftsis, and R. K. Mallik, "An optimized user selection method for cooperative diversity systems," in Proc. IEEE Global Telecommunications Conference (GLOBECOM '06), 28 Nov. - 1 Dec. 2006, San Fransisco, USA.

11. T. A. Tsiftsis, H. G. Sandalidis, G. K. Karagiannidis and N. C. Sagias, "Multihop Free-Space Optical Communications Over Strong Turbulence Channels," in Proc. IEEE International Conference on Communications 2006 (ICC'06), 11-15 June 2006, Turkey.

10. D. S. Michalopoulos, G. K. Karagiannidis and T. A. Tsiftsis, "New results for wireless multihop diversity systems," in Proc. of the 12th European Wireless Conference (EW2006), April 2-5, 2006, Athens, Greece.

9. L.-C. Siafara, D. S. Michalopoulos, T. A. Tsiftsis and G. K. Karagiannidis, "Regenerative versus non-regenerative relaying in cooperative diversity systems," in Proc. 15th IST Mobile & Wireless Communications Summit, 4-8 June, 2006, Mykonos, Greece.

8. T. A. Tsiftsis, George K. Karagiannidis, Nikos C. Sagias and Stavros A. Kotsopoulos, "Performance of MRC diversity receivers over correlated Nakagami-m fading channels, " in Proc. Communication Systems, Networks and Digital Signal Processing (CSNDSP’06), 19-21 July 2006, Patras Univ. Conference Centre, Greece.

7. T. A. Tsiftsis, G. K. Karagiannidis and P. T. Mathiopoulos, "New results on the performance evaluation of the relay fading channel," in Proc. IEEE Vehicular Technology Conference (VTC S'06), May 2006, Melbourne, Australia.

6. N. C. Sagias and G. S. Tombras, G. K. Karagiannidis and T. A. Tsiftsis, "Equal-Gain Combining Receivers over Interference-Limited Nakagami-m Fading with Multiple Cochannel Interferers," in Proc. of the 12th National Conference on Communications, (NCC 2006), Indian Institute of Technology, Delhi, India, Jan. 27-29, 2006.

5. G. K. Karagiannidis, T. A. Tsiftsis, and S. A. Kotsopoulos, «Performance of Broadband Multihop Networks with Cooperative Diversity over Fading Channels,” in Proc. 5th International Network Conference (INC 2005), 5 - 7 July, 2005, Island of Samos, Greece.

4. T. A. Tsiftsis, G. K. Karagiannidis, and S. A. Kotsopoulos, "Wireless Transmissions With Combined Gain Relays Over Fading Channels," in Proc. 4th Annual Mediterranean Ad Hoc Networking Workshop, June 21-24, 2005, i'lle de Porquerolles, France.

3. G. K. Karagiannidis, T. A. Tsiftsis, R. K. Mallik, N. C. Sagias, and S. A. Kotsopoulos, "Closed-Form Bounds of Multihop Relayed Communications in Nakagami-m Fading, " in Proc. IEEE International Conference on Communications 2005 (ICC'05), 16-20 May 2005, Seoul, Korea.

2. G. K. Karagiannidis, D. A. Zogas, N. C. Sagias, T. A. Tsiftsis, and P. T. Mathiopoulos, "Multihop Communications with Fixed-Gain Relays over Generalized Fading Channels," in Proc. IEEE Global Telecom. Conference (GLOBECOM '04), December 2004, Dallas Texas, USA.

1. D. A. Zogas, G. K. Karagiannidis, N. C. Sagias, T. A. Tsiftsis, P. T. Mathiopoulos, and S. A. Kotsopoulos, "Dual Hop Wireless Communications over Nakagami Fading," in Proc. IEEE Vehicular Technology Conference, May 2004, Milan - Italy.