Paschalis Sofotasios

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Dr. Paschalis C. Sofotasios

Paschalis C. Sofotasios was born in Volos, Greece in 1978. He received the Master of Engineering degree in Electronic and Communications Engineering from the University of Newcastle upon Tyne, the Master of Science degree in Satellite Communications Engineering from the University of Surrey and the Doctor of Philosophy degree in Electronic and Electrical Engineering from the University of Leeds. His Master's studies were funded by a scholarship from the Engineering and Physical Sciences Research Council, (EPSRC) and his Doctoral studies were sponsored by a Collaborative Awards in Science and Engineering (CASE) award from EPSRC and Pace plc.

He was a Post-Doctoral Researcher at the University of Leeds until August 2013 and during Fall 2011 he was a Visiting Research Scholar at the Electrical Engineering Department of the University of California Los Angeles (UCLA). Since Fall 2013, he is a Post-Doctoral Researcher at the Department of Electronics and Communications Engineering at Tampere University of Technology and at the Wireless Communications Systems Group at Aristotle University of Thessaloniki.

His research interests are in the areas of Fading Channel Characterization and Modelling, Spectrum Sensing, Free-Space Optical Communications, Cooperative Systems, Diversity Systems, Digital Receiver Design, Special Functions and Statistical Distributions with emphasis in the Analytic Performance Evaluation of Wireless Communications over Fading Channels.


Education

  • Ph.D. in Electronic and Electrical Engineering, University of Leeds, United Kingdom
    • Thesis: On Special Functions and Composite Statistical Distributions and their Applications in Digital Communications over Fading Channels
    • Supervisors: Dr. S. Freear, Prof. M. Ghogho, Prof. G. Markarian
  • M.Sc. in Satellite Communications Engineering, University of Surrey, United Kingdom
    • Thesis: A Multi-Vectorial Electromagnetic Method for Radio Coverage in Mobile Communications
    • Supervisor: Dr. C. Tzaras
  • M.Eng. in Electronic and Communications Engineering, University of Newcastle upon Tyne, United Kingdom
    • Thesis (I): Performance Analysis of Hand-over Techniques for Low-Earth-Orbit (LEO) Satellite Communications
    • Supervisors: Dr. G. Chester, Dr. W.L. Woo
    • Thesis (II): Numerical Analysis and Modelling of Optically Controlled Microwave Circuits
    • Supervisor: Dr. S. Sali


Publications

Peer-Reviewed Journal Papers
  • M. K. Fikadu, P. C. Sofotasios, Q. Cui, M. Valkama, G. K. Karagiannidis, "Exact Error Analysis and Energy-Efficiency Optimization of Regenerative Relay Systems," IEEE Transactions on Vehicular Technology, Accepted for Publication
  • S. Dikmese, P. C. Sofotasios, M. Renfors, M. Valkama, "Subband Energy Based Reduced Complexity Spectrum Sensing under Noise Uncertainty and Frequency-Selective Spectral Characteristics," IEEE Transactions on Signal Processing, Accepted for Publication
  • A. Al Hammadi, O. Alhussein, P. C. Sofotasios, S. Muhaidat, M. Al-Qutayri, S. Al-Araji, G. K. Karagiannidis, J. Liang, "Unified Analysis of Cooperative Spectrum Sensing over Composite and Generalized Fading Channels," IEEE Transactions on Vehicular Technology, Accepted for Publication
  • P. C. Sofotasios, L. Mohjazi, S. Muhaidat, M. Al-Qutayri, G. K. Karagiannidis, "Energy Detection of Unknown Signals over Cascaded Fading Channels," IEEE Antennas and Wireless Propagation Letters, Accepted for Publication
  • P. C. Sofotasios, S. Muhaidat, M. Valkama, M. Ghogho, G. K. Karagiannidis, "Entropy and Channel Capacity under Optimum Power and Rate Adaptation over Generalized Fading Conditions," IEEE Signal Processing Letters, vol. 22, no. 11, pp. 2162 − 2166, Nov. 2015
  • P. C. Sofotasios, S. Muhaidat, G. K. Karagiannidis, B. S. Sharif, "Solutions to Integrals Involving the Marcum Q−function and Applications," IEEE Signal Processing Letters, vol. 22, no. 10, pp. 1752 − 1756, Oct. 2015
  • T. A. Tsiftsis, P. C. Sofotasios, N. Papanikolaou, M. Loupis, "On the Deployment of a Wireless Sensor Network in Dispersed Renewable Energy Sources for Increasing Efficiency of Power Distribution Networks," Springer Journal of Modern Power Systems and Clean Energy, June 2015
  • S. Dikmese, P. C. Sofotasios, T. Ihalainen, M. Renfors, M. Valkama, "Efficient Energy Detection Methods for Spectrum Sensing under Non-Flat Spectral Characteristics," IEEE Journal on Selected Areas in Communications, vol. 33, no. 5, pp. 755 − 770, May 2015
  • K. Ho-Van, P. C. Sofotasios, G. C. Alexandropoulos, S. Freear, "Bit Error Rate of Underlay Decode-and-Forward Cognitive Networks with Best Relay Selection," IEEE/KICS Journal of Communications and Networks, vol. 17, no. 2, pp. 162 - 171, Apr. 2015
  • I. Diaz, L. R. Wilhelmsson, P. C. Sofotasios, Y. Miao, S. Tan, O. Edfors, V. Owall, "A New Approach to Sign-Bit Based Parameter Estimation in OFDM Receivers," Springer Circuit, Systems, and Signal Processing, Mar. 2015
  • J. F. Paris, P. C. Sofotasios, T. A. Tsiftsis, "Guest Editorial: Advances in Statistical Channel Modeling for Wireless Communications," Hindawi International Journal of Antennas and Propagation, Article ID 541619, 2 pages, 2015
  • P. C. Sofotasios, T. A. Tsiftsis, Yu. A. Brychkov, S. Freear, M. Valkama, G. K. Karagiannidis, "Analytic Expressions and Bounds for Special Functions and Applications in Communication Theory," IEEE Transactions on Information Theory, vol. 60, no. 12, pp. 7798 - 7823, Dec. 2014
  • A. Gokceoglu, Y. Zhou, M. Valkama, P. C. Sofotasios, "Multi-Channel Energy Detection under Phase Noise: Analysis and Mitigation," ACM/Springer Journal on Mobile Networks and Applications (MONET), vol. 19, no. 4, pp. 473 - 486, Aug. 2014
  • K. Ho-Van, P. C. Sofotasios, S. Freear, "Underlay Cooperative Cognitive Networks with Imperfect Nakagami-m Fading Channel Information and Strict Transmit Power Constraint: Interference Statistics and Outage Probability Analysis," IEEE/KICS Journal of Communications and Networks, vol. 16, no. 1, pp. 10 - 17, Feb. 2014
  • K. Ho-Van, P. C. Sofotasios, "Exact BER Analysis of Underlay Decode-and-Forward Multi-hop Cognitive Networks with Estimation Errors," IET Communications, vol. 7, no. 18, pp. 2122 - 2132, Dec. 2013
  • G. C. Alexandropoulos, P. C. Sofotasios, K. Ho-Van, S. Freear, "Symbol error probability of DF relay selection over arbitrary Nakagami-m fading channels," HINDAWI Journal of Engineering (Invited Paper), vol. 2013, Article ID 325045, 2013
  • A. Gokceoglu, Y. Zou, M. Valkama, P. C. Sofotasios, P. Mathecken, D. Cabric, "Mutual Information Analysis of OFDM Radio Link under Phase Noise, IQ Imbalance and Frequency-Selective Fading Channel," IEEE Transactions on Wireless Communications, vol. 12, no. 6, pp. 3048 - 3059, June 2013
  • P. C. Sofotasios, E. Rebeiz, L. Zhang, T. Tsiftsis, D. Cabric, S. Freear, "Energy Detection-Based Spectrum Sensing over Generalized and Extreme Fading Channels," IEEE Transactions on Vehicular Technology, vol. 62, no. 3, pp. 1031 - 1040, March 2013
  • G. C. Alexandropoulos, A. Papadogiannis, P. C. Sofotasios, "A Comparative Study of Relaying Schemes with Decode-and-Forward over Nakagami-m Fading Channels," Journal of Computer Networks and Communications, (Invited Paper), vol. 2011, Article ID 560528, Dec. 2011


Peer-Reviewed Conference Papers
  • M. K. Fikadu, P. C. Sofotasios, M. Valkama, Q. Cui, S. Muhaidat, G. K. Karagiannidis, "Outage Probability Analysis of Full-Duplex Regenerative Relaying over Generalized Asymmetric Fading Channels," in IEEE Global Communications Conference, (Globecom '15), San Diego, CA, USA, Dec. 2015
  • S. Dikmese, P. C. Sofotasios, M. Renfors, M. Valkama, M. Ghogho, "Analysis of Noise Uncertanity and Frequency Selectivity Effects in Wideband Multimode Spectrum Sensing," in IEEE Global Communications Conference, (Globecom '15), San Diego, CA, USA, Dec. 2015
  • M. K. Fikadu, P. C. Sofotasios, M. Valkama, S. Muhaidat, Q. Cui, G. K. Karagiannidis, "Outage Probability Analysis of Dual-hop Full-Duplex Decode-and-Forward Relaying over Generalized Multipath Fading Conditions," in Eleventh IEEE International Conference on Wireless and Mobile Computing, Networking and Communications, (WiMob '15), Abu Dhabi, UAE, Oct. 2015
  • O. Alhussein, A. Al Hammadi, P. C. Sofotasios, S. Muhaidat, J. Liang, M. Al-Qutayri, G. K. Karagiannidis, "Performance Analysis of Energy Detection over Mixture Gamma based Fading Channels with Diversity Reception," in Eleventh IEEE International Conference on Wireless and Mobile Computing, Networking and Communications, (WiMob '15), Abu Dhabi, UAE, Oct. 2015
  • M. K. Fikadu, P. C. Sofotasios, M. Valkama, Q. Cui, S. Muhaidat, G. K. Karagiannidis, "Analytic Symbol Error Rate Evaluation of M−PSK Based Regenerative Cooperative Networks Over Generalized Fading Channels," in Eleventh IEEE International Conference on Wireless and Mobile Computing, Networking and Communications, (WiMob '15), Abu Dhabi, UAE, Oct. 2015
  • K. Ho-Van, P. C. Sofotasios, V. Que Son, L. Thanh Tra, P. Hong Lien, "Analysis of Cognitive Cooperative Networks with Best Relay Selection and Diversity Reception," in IEEE International Conference on Advanced Technologies for Communications, (ATC '15), HoChiMinh City, Vietnam, Oct. 2015
  • A.–A. A. Boulogeorgos, P. C. Sofotasios, S. Muhaidat, M. Valkama, G. K. Karagiannidis, "The Effects of RF Impairments in Vehicle-to-Vehicle Communications," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • S. Ki Yoo, S. L. Cotton, P. C. Sofotasios, M. Matthaiou, M. Valkama, G. K. Karagiannidis, "The κ − µ / Inverse Gamma Fading Model," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • A. Bagheri, P. C. Sofotasios, T. A. Tsiftsis, A. Shahzadi, S. Freear, M. Valkama, "Area under ROC Curve of Energy Detection over Generalized Fading Channels," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • L. Mohjazi, D. Dawoud, P. C. Sofotasios, S. Muhaidat, M. Dianati, M. Valkama, G. K. Karagiannidis, "Unified Analysis of Cooperative Spectrum Sensing over Generalized Multipath Fading Channels," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • S. Ki Yoo, P. C. Sofotasios, S. L. Cotton, M. Matthaiou, M. Valkama, G. K. Karagiannidis, "The η − µ / Inverse Gamma Composite Fading Model," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • M. K. Fikadu, P. C. Sofotasios, M. Valkama, Q. Cui, G. K. Karagiannidis, "Energy-Efficiency Analysis of Regenerative Cooperative Systems Under Spatial Correlation," in IEEE International Symposium on Personal Indoor and Mobile Radio Communications, (PIMRC '15), Hong Kong, Aug/Sep. 2015
  • A. Bagheri, P. C. Sofotasios, T.A. Tsiftsis, A. Shahzadi, M. Valkama, "AUC Study of Energy Detection Based Spectrum Sensing over η−µ and α−µ Fading Channels," in IEEE International Conference on Communications, (ICC '15), London, UK, June 2015
  • S. Dikmese, Z. Zheng, P. C. Sofotasios, M. Renfors, M. Valkama, "Implementation of Proposed Energy Detector Based Sensing Techniques for Wireless Microphone Signal under Frequency Selective Channels," in IEEE International Conference on Communications, (ICC '15), London, UK, June 2015
  • A. Bagheri, P. C. Sofotasios, T. A. Tsiftsis, A. Shahzadi, M. Valkama, "Spectrum Sensing in Generalized Multipath Fading Conditions Using Square-Law Combining," in IEEE International Conference on Communications, (ICC '15), London, UK, June 2015
  • P. C. Sofotasios, M. K. Fikadu, K. Ho-Van, M. Valkama, and G. K. Karagiannidis, "The Area Under a Receiver Operating Characteristic Curve over Enriched Multipath Fading Conditions," in IEEE Global Communications Conference, (Globecom '14), Austin, TX, USA, Dec. 2014
  • M. K. Fikadu, P. C. Sofotasios, M. Valkama, Q. Cui, "Analytic Performance Evaluation of M-QAM Based Decode-and-Forward Relay Networks over Enriched Multipath Fading Channels," in IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob '14), Larnaca, Cyprus, Oct. 2014
  • P. C. Sofotasios, M. Valkama, Yu. A. Brychkov, T. A. Tsiftsis, S. Freear, G. K. Karagiannidis, "Analytic Solutions to a Marcum Q-Function-Based Integral and Application in Energy Detection," in Ninth International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM ‘14), Oulu, Finland, June 2014
  • S. Dikmese, P. C. Sofotasios, M. Renfors, M. Valkama, "Maximum-Minimum Energy Based Spectrum Sensing under Frequency Selectivity for Cognitive Radios," in Ninth International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM ‘14), Oulu, Finland, June 2014
  • K. Ho-Van, P. C. Sofotasios, S. V. Que, T. D. Anh, T. P. Quang, L. P. Hong, "Analytic Performance Evaluation of Underlay Relay Cognitive Networks with Channel Estimation Errors," in IEEE International Conference on Advanced Technologies for Communications (ATC '13), HoChiMinh City, Vietnam, Oct. 2013
  • P. C. Sofotasios, M. Fikadu, K. Ho-Van, M. Valkama, "Energy Detection Sensing of Unknown Signals over Weibull Fading Channels," in IEEE International Conference on Advanced Technologies for Communications (ATC '13), HoChiMinh City, Vietnam, Oct. 2013
  • P. C. Sofotasios, K. Ho-Van, T. D. Anh, H. D. Quoc, "Analytic Results for Efficient Computation of the Nuttall−Q and Incomplete Toronto Functions," in IEEE International Conference on Advanced Technologies for Communications (ATC '13), HoChiMinh City, Vietnam, Oct. 2013
  • M. K. Fikadu, P. C. Sofotasios, Q. Cui, M. Valkama, "Energy-Optimized Cooperative Relay Network over Nakagami-m Fading Channels," in IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob '13), Lyon, France, Oct. 2013
  • P. C. Sofotasios, T. A. Tsiftsis, K. Ho-Van, S. Freear, L. R. Wilhelmsson, M. Valkama, "The κ-μ/Inverse-Gaussian Composite Statistical Distribution in RF and FSO Wireless Channels," in IEEE Vehicular Technology Conference (VTC '13 - Fall), Las Vegas, USA, Sep. 2013
  • K. Ho-Van, P. C. Sofotasios, "Outage Behaviour of Cooperative Underlay Cognitive Networks with Inaccurate Channel Estimation," in IEEE International Conference on Ubiquitous and Future Networks (ICUFN '13), Da Nang, Vietnam, July 2013
  • K. Ho-Van, P. C. Sofotasios, "Bit Error Rate of Underlay Multi-hop Cognitive Networks in the Presence of Multipath Fading," in IEEE International Conference on Ubiquitous and Future Networks (ICUFN '13), Da Nang, Vietnam, July 2013 (Best Paper Award)
  • P. C. Sofotasios, T. A. Tsiftsis, M. Ghogho, L. R. Wilhelmsson, M.Valkama, "The η-μ/Inverse-Gaussian Distribution: A Novel Physical Multipath /Shadowing Fading Model," in IEEE International Conference on Communications (ICC' 13), Budapest, Hungary, June 2013
  • P. C. Sofotasios, S. Freear, "The α-κ-μ/gamma Composite Distribution: A Generalized Non-Linear Multipath/Shadowing Fading Model," in Eighth IEEE India International Conference (INDICON '11), Hyderabad, India, Dec. 2011
  • P. C. Sofotasios, S. Freear, "New analytic expressions for the Rice Function and the Incomplete Lipschitz-Hankel Integrals," in Eighth IEEE India International Conference (INDICON '11), Hyderabad, India, Dec. 2011
  • P. C. Sofotasios, S. Freear, "The α-κ-μ Extreme Distribution: Characterizing Non Linear Severe Fading Conditions," in Australasian Telecommunication Networks and Applications Conference (ATNAC '11), Melbourne, Australia, Nov. 2011
  • P. C. Sofotasios, S. Freear, "Upper and Lower Bounds for the Rice Ie-function," in Australasian Telecommunication Networks and Applications Conference (ATNAC '11), Melbourne, Australia, Nov. 2011
  • P. C. Sofotasios, S. Freear, "The η-μ/gamma and the λ-μ/gamma Multipath/Shadowing Distributions", in Australasian Telecommunication Networks and Applications Conference (ATNAC '11), Melbourne, Australia, Nov. 2011
  • P. C. Sofotasios, S. Freear, "Novel Results for the Incomplete Toronto Function and Incomplete Lipschitz-Hankel Integrals," in IEEE International Microwave and Optoelectronics Conference (IMOC '11), Natal, Brazil, Oct. 2011
  • P. C. Sofotasios, S. Freear, "On the κ-μ/gamma Composite Distribution: A Generalized Multipath/Shadowing Fading Model," in IEEE International Microwave and Optoelectronics Conference (IMOC '11), Natal, Brazil, Oct. 2011
  • S. Harput, P. C. Sofotasios, S. Freear, "A Novel Composite Statistical Model For Ultrasound Applications," in IEEE International Ultrasonics Symposium (IUS '11), Orlando, FL, USA, Oct. 2011
  • P. C. Sofotasios, S. Freear, "Simple and Accurate Approximations for the Two Dimensional Gaussian Q-Function," in IEEE Vehicular Technology Conference (VTC-Spring '11), Budapest, Hungary, May 2011
  • P. C. Sofotasios, S. Freear, "The κ-μ/gamma Extreme Composite Distribution: A Physical Composite Fading Model," in IEEE Wireless Communications and Networking Conference (WCNC '11), Cancun, Mexico, Mar. 2011
  • P. C. Sofotasios, S. Freear, "Novel Expressions for the Marcum and One Dimensional Q-Functions," in Seventh International Symposium on Wireless Communication Systems (7th ISWCS '10) , York, UK, Sep. 2010
  • P. C. Sofotasios, S. Freear, "The κ-μ/gamma Composite Fading Model," in IEEE International Conference in Wireless Information Technology and Systems (ICWITS '10), Honolulu, HI, USA, Aug/Sep. 2010
  • P. C. Sofotasios, S. Freear, "The η-μ/gamma Composite Fading Model," in IEEE International Conference in Wireless Information Technology and Systems (ICWITS '10), Honolulu, HI, USA, Aug/Sep. 2010
  • P. C. Sofotasios, S. Freear, "Novel Expressions for the One and Two Dimensional Gaussian Q-Functions," in IEEE International Conference in Wireless Information Technology and Systems (ICWITS '10), Honolulu, HI, USA, Aug/Sep. 2010
  • P. C. Sofotasios, S. Freear, "A Novel Representation for the Nuttall Q-Function," im IEEE International Conference in Wireless Information Technology and Systems (ICWITS '10), Honolulu, HI, USA, Aug/Sep. 2010


Patents

  • P. C. Sofotasios, S. Freear, "Data Receiver with Improved Response to Long and Short Term Fading". GB/1004946, Filed: 03-2010, Assigned: 03-2011
  • P. C. Sofotasios, S. Freear, "Data Receiver with Improved Response to Long and Short Term Data Signal Fading". EP/2369801, Filed: 03-2010, Assigned: 03-2011
  • P. C. Sofotasios, S. Freear, "Data Receiver with Improved Response to Long and Short Term Fading". US/20120014481, Filed: 03-2010, Assigned: 01-2012

Contact Information

e-mail: p.sofotasios@ieee.org