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Anastasios (Tassos) K. Papazafeiropoulos received his B.Sc. in Physics with rank 2 and got his M.Sc. in Electronics and Computer Science with rank 1 (distinction) from the University of Patras, Greece in 2003 and 2005, respectively. He received his Ph.D. at the Dept. of Electrical and Computer Engineering from the same university. After one year as a Research Fellow in IDCOM (Institute for Digital Communications) at the University of Edinburgh (UK), where he participated in two FP7 European projects (HIATUS and HARP), he is currently a Research Fellow at Imperial College London awarded with a Marie Curie fellowship (IEF-IAWICOM). Moreover, during 2012 he worked as a Research Engineer in the Laboratory for Manufacturing Systems & Automation, Dept. of Mechanical Engineering and Aeronautics, University of Patras, contributing by means of his scientific point of view. Furthermore, he has collaborated with the Hellenic Open University and he has worked as a Lecturer at Hellenic Air Force, at the National Academy of Police Officers, at the Technical Educational Institute of Patras (TEI), at High school (part time), and at the Institute of Professional Expertise teaching various subjects such as mobile telephony, networks, and C++ programming. In addition, he has worked as research assistant at the laboratory of wireless communications in the Dept. of Electrical and Computer Engineering as well as at several other departments at the University of Patras.

Publications :

Journals
  • A. K. Papazafeiropoulos, S. K. Sharma, T. Ratnarajah, S. Chatzinotas, “Impact of Residual Additive Transceiver Hardware Impairments on Rayleigh-Product MIMO Channels with Linear Receivers: Exact and Asymptotic Analyses,” IEEE Trans. On Commun., Sep. 2017.
  • A. K. Papazafeiropoulos and T. Ratnarajah, “Towards a Realistic Assessment of Multiple Antenna HCNs: Residual Additive Transceiver Hardware Impairments and Channel Aging,” IEEE Transactions on Vehicular Technology, May 2017.
  • A. K. Papazafeiropoulos, B. Clerkx, and T. Ratnarajah “Rate-Splitting to Mitigate Residual Transceiver Hardware Impairments in Massive MIMO Systems,” Transactions on Vehicular Technology, February 2017.
  • A. K. Papazafeiropoulos, S. K. Sharma, and S. Chatzinotas “Ergodic capacity analysis of Rayleigh-product MIMO channels with linear receivers with residual transceiver hardware impairments: Conventional and large system analyses,” Transactions on Vehicular Technology.
  • A. K. Papazafeiropoulos, Hien Quoc Ngo, and T. Ratnarajah, “Performance of Massive MIMO Uplink with Zero-Forcing receivers under Delayed Channels,” IEEE Trans. on Veh. Tech., vol. 66, no. 4, pp. 3158-3169, April 2017. doi: 10.1109/TVT.2016.2594031.
  • A. K. Papazafeiropoulos, “Impact of General Channel Aging Conditions on the Downlink Performance of Massive MIMO,” IEEE Trans. on Veh. Tech., vol. 66, no. 2, pp. 1428-1442, Feb. 2017. doi: 10.1109/TVT.2016.2570742
  • C. Kong, C. Zhong, A. K. Papazafeiropoulos, M. Matthaiou, and Z. Zhang, “Sum-rate and power scaling of uplink massive MIMO systems with channel aging”, IEEE Tran. of Commun., vol. 63, no. 12, pp. 4879-4893, Dec. 2015.
  • A. K. Papazafeiropoulos and T. Ratnarajah, “Downlink MIMO HCNs with Residual Transceiver Hardware Impairments,” IEEE Communications Letters, vol.20, no.10, pp.2023-2026, Oct 2016.
  • A. K. Papazafeiropoulos and T. Ratnarajah, “Deterministic equivalent performance analysis of time-varying massive MIMO systems,” IEEE Tran. of Wireless Commun., vol.14, no.10, pp.5795-5809, Oct. 2015.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “Statistical properties for the envelope and phase of the α-η-μ generalized fading channels,” Wireless Personal Communications, Springer, July 2011.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “Generalized phase crossing rate and random FM Noise for α-μ fading channels,” IEEE Trans. Veh. Technol., vol. 59, no. 1, pp. 494–499, January. 2010.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “An extended generalized rice model for wireless communications,” IEEE Trans. Veh. Technol., vol. 59, no. 5, pp. 2604–2609, June 2010.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “Second-order statistics for the envelope of the α-κ-μ generalized fading channels,” IEEE Commun. Letters, vol. 14, no. 4, pp. 291–293, April 2010.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “An extended loo model with inhomogeneous scattering and its statistical properties,” Wireless Personal Communications, Springer, October 2009.
  • A. K. Papazafeiropoulos and S. A. Kotsopoulos, “The α−λ−μ and α−η−μ small-scale general fading distributions: A unified approach,” Wireless Personal Communications, Springer, November 2009.
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​Conferences
  • [C21] A. K. Papazafeiropoulos, S. K. Sharma, S. Chatzinotas, T. Ratnarajah, and B. Ottersten, "Impact of Transceiver Harware impairments on the Ergodic Channel Capacity for Rayleigh-Product MIMO Channels," accepted in IEEE Signal Processing Advances in Wireless Communications (SPAWC 2016), Edinburgh, U.K., July 2016.
  • [C20] A. K. Papazafeiropoulos, S. K. Sharma, and S. Chatzinotas, "MMSE Filtering Performance of DH-AF Massive MIMO Relay Systems with Residual Transceiver Impairments,” accepted in  IEEE International Conference on Communications (ICC 2016), Kuala Lumpur, Malaysia, May 2016.
  • [C19] A. K. Papazafeiropoulos, S. K. Sharma, and S. Chatzinotas, "Impact of transceiver impairments on the capacity of dual-hop relay massive MIMO systems,”  in Proc. IEEE Global Communications Conference (GLOBECOM 2015) - Workshop on Massive MIMO: From theory to practice, 2015. 
  • [C18] A. K. Papazafeiropoulos, C. ZHong, “Confidentiality analysis in multicast stochastic MIMO networks with imperfect CSIT,”  in Proc. IEEE Global Communications Conference (GLOBECOM 2015) - Workshop on Trusted Communications with Physical Layer Security, 2015. 
  • [C17] A. K. Papazafeiropoulos, "Downlink Performance of Massive MIMO under General Channel Aging Conditions," in Proc. IEEE Global Communications Conference (GLOBECOM), December 2015.
  • [C16] C. Kong, C. Zhong, A. K. Papazafeiropoulos, M. Matthaiou, and Z. Zhang, "Effect of Channel Aging on the Sum Rate of Uplink Massive MIMO Systems," in Proc. IEEE International Symposium on Information Theory (ISIT 2015), Hong-Kong, China, Jun. 2015.
  • [C15] A. K. Papazafeiropoulos, "Impact of User Mobility on Optimal Linear Receivers in Cellular Networks," in Proc. IEEE International Conference on Communications (ICC 2015),London, U.K., Jun. 2015, pp. 3842-3847.
  • [C14] A. K. Papazafeiropoulos, H. Q. Ngo, M. Matthaiou, and T. Ratnarajah, "Uplink Performance of Conventional and Massive MIMO Cellular Systems with Delayed CSIT," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2014), Washington, D.C., Sep. 2014.
  • [C13] P. Aquilina, T. Ratnarajah, A. K. Papazafeiropoulos, "DoF region and sum rate analysis for the K-user MIMO IC with limited CSI feedback," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2014), Washington, D.C., September 2014.
  • [C12] A. K. Papazafeiropoulos, T. Ratnarajah; "Uplink Performance of Massive MIMO Subject to Delayed CSIT and Anticipated Channel Prediction," in Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2014), Florence, Italy, 4 - 9 May. 2014.
  • [C11] A. K. Papazafeiropoulos, T. Ratnarajah, "Optimal Degrees of Freedom for the K-user MIMO Interference Channel even with Delayed CSIT," in Proc. IEEE Wireless Communications and Networking Conference (WCNC 2014), Instabul, Turkey, 6 - 9 Apr. 2014 
  • [C10] A. K. Papazafeiropoulos, T. Ratnarajah; "Linear Precoding for Downlink Massive MIMO with Delayed CSIT and Channel Prediction," in Proc. IEEE Wireless Communications and Networking Conference (WCNC 2014), Instabul, Turkey, 6 - 9 Apr. 2014 
  • [C9] A. K. Papazafeiropoulos, T. Ratnarajah; "Ergodic Channel Capacity for Generalized Fading channels," in Proc. IEEE Wireless Communications and Networking Conference (WCNC 2014), Instabul, Turkey, 6 - 9 Apr. 2014 
  • [C8] Y.Luo, A. K. Papazafeiropoulos, T. Ratnarajah; "Degrees of Freedom Region of MIMO Interference Channel with Imperfect Current and Delayed CSIT," in Proc. IEEE Wireless Communications and Networking Conference (WCNC 2014), Instabul, Turkey, 6 - 9 Apr. 2014 
  • [C7] A. K. Papazafeiropoulos, T. Ratnarajah, "Degrees of Freedom of Multiple-Antenna Interference Channel with General CSIT," ProcProcProcIEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2013), London, UK, September 2013.
  • [C6] A. K. Papazafeiropoulos, S.A. Kotsopoulos, and D. Zevgolis, "The α-λ-η-μ: A General Fading Distribution," in Proc. IEEE Wireless Communications and Networking Conference (WCNC 2009), pp. 1-6, Budapest Hungary, April 2009.
  • [C5] A. K. Papazafeiropoulos, S. A. Kotsopoulos, "The α-η-μ and α-λ-μ Joint Envelope-Phase Fading Distributions," in Proc. IEEE International Conference on Communications (ICC 2009), pp. 1-6, Dresden, Germany, June 2009.
  • [C4] A. K. Papazafeiropoulos, S.A. Kotsopoulos, "The η-λ-μ: A General Fading Distribution," in Proc. IEEE Global Communications Conference (Globecom 2009), pp. 1-5, Hawaii, USA, November 2009.
  • [C3] A. K. Papazafeiropoulos, S. A. Kotsopoulos, "The α-μ Joint Envelope-Phase Fading Distribution," in Proc. IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2009), pp. 919-922, Tokyo, Japan, September 2009.
  • [C2] A. K. Papazafeiropoulos, S. A. Kotsopoulos, "The α-λ-μ: A General Fading Distribution," in Proc. Global Mobile Communication Conference (GMC 2007), Shangai, October 2007.
  • [C1] A. K. Papazafeiropoulos, S. A. Kotsopoulos, "The α-μ Joint Envelope-Phase Fading Distributions," in Proc. A' Panhellenick Conference in Electronics and Telecommunications (PACET), 2009, Rio, Patra.