Gripeos PJ, Nistazakis HE, Aidinis K, Kriempardis D, Tombras GS. Performance investigation of FSO communication systems with chromatic dispersion, propagation losses and truncated normal modeled time jitter. Optics Communications [Internet]. 2023;532. Website

Oreinos D, Gripeos PJ, Kapotis E, Roditi E, Nistazakis HE, Tombras GS. Availability Study of Atmospheric Gaussian Pulse Propagation with Normally Distributed Time Jitter for Optical Wireless Communication Systems. In: 2022 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications, CoBCom 2022. ; 2022. Website

Nantsou TP, Tombras GS. Hands-on Experiments in Electricity for Physics Teachers and Students. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2022-March. ; 2022. pp. 242-248. Website

Nantsou TP, Tombras GS. Hands-on Physics Experiments for K-6 Teachers at CERN. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2022-March. ; 2022. pp. 180-188. Website

Nantsou TP, Tombras GS. STEM Lab on Climate Change with Simple Hands-on Experiments. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2022-March. ; 2022. pp. 249-256. Website

Volos CK, Moysis L, Roumelas GD, Giakoumis A, Nistazakis HE, Tombras GS. Circuit Implementation of a Modified Chaotic System with Hyperbolic Sine Nonlinearities Using Bi-Color LED †. Technologies [Internet]. 2021;9. Website

Stassinakis AN, Papavgeris GA, Nistazakis HE, Tsigopoulos AD, Androutsos NA, Tombras GS. Experimental Model Development for the Attenuation Coefficient Estimation of Terrestrial Optical Wireless Links over the Sea. Telecom [Internet]. 2021;2:93-107. Website

Androutsos NA, Nistazakis HE, Sandalidis HG, Leitgeb E, Tombras GS. Α dual-hop equivalent structure of a generalised multi-hop free-space optics network. IET Communications [Internet]. 2021;15:730-735. Website

Gripeos PJ, Nistazakis HE, Roditi E, Roumelas GD, Tombras GS, Volos CK. On the BER Performance of OOK FSO Links with Receivers' Diversity and Time Jitter over Strong Turbulence Channels. In: 2021 10th International Conference on Modern Circuits and Systems Technologies, MOCAST 2021. ; 2021. Website

Androutsos NA, Nistazakis HE, Stassinakis AN, Chatzikontis EV, Tsigopoulos AD, Roditi E, Tombras GS. Block Error Performance of PAM or PPM SIMO FSO Links over Strong Turbulence Channels. In: 2021 10th International Conference on Modern Circuits and Systems Technologies, MOCAST 2021. ; 2021. Website

Nantsou TP, Kapotis EC, Tombras GS. Greek MOOC of experiments with simple materials for students generates significant findings for teachers and physics education. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2021-April. ; 2021. pp. 631-636. Website

Nantsou TP, Kapotis EC, Tombras GS. A lab of hands-on STEM experiments for primary teachers at CERN. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2021-April. ; 2021. pp. 582-590. Website

Androutsos NA, Nistazakis HE, Chatzikontis EV, Stassinakis AN, Tombras GS. Spatial jitter influence on the average bler performance of SIMO FSO links over atmospheric turbulence channels. Electronics (Switzerland) [Internet]. 2021;10. Website

Nantsou T, Frache G, Kapotis EC, Nistazakis HE, Tombras GS. Learning-by-doing as an educational method of conducting experiments in electronic physics. In: IEEE Global Engineering Education Conference, EDUCON. Vol. 2020-April. ; 2020. pp. 236-241. Website

Stassinakis AN, Nistazakis HE, Varotsos GK, Tombras GS. Performance of Underwater Wireless Optical Link Under Weak Turbulence and Pointing Errors Using Heterodyne QAM Technique. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) [Internet]. 2020;11616 LNCS:552-559. Website

Roumelas GD, Nistazakis HE, Stassinakis AN, Varotsos GK, Tsigopoulos AD, Tombras GS. Time Jitter, Turbulence and Chromatic Dispersion in Underwater Optical Wireless Links. Technologies [Internet]. 2020;8. Website

Giakoumis A, Androutsos NA, Volos CK, Moysis L, Nistazakis HE, Tombras GS. A Chaotic Circuit with Bi-Color LED as a Nonlinear Element. In: 2020 9th International Conference on Modern Circuits and Systems Technologies, MOCAST 2020. ; 2020. Website

Gripeos PJ, Nistazakis HE, Roumelas GD, Christofilakis V, Tsigopoulos AD, Tombras GS. DF Relayed OOK and PAM FSO Links with Turbulence and Time Jitter. In: CoBCom 2020 - International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications - Proceedings. ; 2020. Website

Stassinakis AN, Nistazakis HE, Chatzikontis EV, Roumelas GD, Tombras GS, Tsigopoulos AD, Mkrttchian G. An Empirical Expression for Attenuation Coefficient Evaluation of FSO Links during Night-Time over Maritime Area of Piraeus Port in Greece. In: 2020 9th International Conference on Modern Circuits and Systems Technologies, MOCAST 2020. ; 2020. Website

Androutsos NA, Nistazakis HE, Manganaris KN, Tombras GS, Leitgeb E, Volos CK. Outage Probability Estimation for a Multi-hop Terrestrial FSO Link Simplified to a Dual-hop Scheme. In: 2020 9th International Conference on Modern Circuits and Systems Technologies, MOCAST 2020. ; 2020. Website

Roumelas GD, Nistazakis HE, Leitgeb E, Stassinakis AN, Tombras GS. On the performance of optical wireless communication links impaired by time jitter, M-turbulence and pointing errors. Optics Communications [Internet]. 2020;472. Website

Androutsos NA, Nistazakis HE, Gappmair W, Stassinakis AN, Tombras GS. Pointing errors influence at the performance of a multi-hop terrestrial FSO link emulated by a dual-hop scheme. Optics Communications [Internet]. 2020;475. Website

Roumelas GD, Nistazakis HE, Leitgeb E, Ivanov HD, Volos CK, Tombras GS. Serially DF relayed hybrid FSO/MMW links with Weibull fading, M-turbulence and pointing errors. Optik [Internet]. 2020;216. Website

Frache G, Tombras GS, Nistazakis HE, Thompson N. Pedagogical approaches to 21st century learning: A model to prepare learners for 21st century competencies and skills in engineering. In: IEEE Global Engineering Education Conference, EDUCON. Vol. April-2019. ; 2019. pp. 711-717. Website

Frache G, Vavasis GG, Mkrttchian G, Stavropoulos K, Kapotis EC, Nistazakis HE, Tombras GS. Research and categorization of conceptual difficulties in electricity's concepts and basic laws. In: IEEE Global Engineering Education Conference, EDUCON. Vol. April-2019. ; 2019. pp. 999-1006. Website

Androutsos NA, Nistazakis HE, Khalid H, Muhammad SS, Tombras GS. Serial DF relayed FSO links over mixture Gamma turbulence channels and nonzero boresight spatial jitter. Computation [Internet]. 2019;7. Website

Varotsos GK, Nistazakis HE, Gappmair W, Sandalidis HG, Tombras GS. Simo subcarrier psk fso links with phase noise and non-zero boresight pointing errors over turbulence channels. IET Communications [Internet]. 2019;13:831-836. Website

Ninos MP, Nistazakis HE, Leitgeb E, Tombras GS. Spatial diversity for QAM OFDM RoFSO links with nonzero boresight pointing errors over atmospheric turbulence channels. Journal of Modern Optics [Internet]. 2019;66:241-251. Website

Frache G, Tombras GS, Stavropoulos K, Mkrttchian G. The use of technology to support learning at western region colleges, UAE. In: IEEE Global Engineering Education Conference, EDUCON. Vol. April-2019. ; 2019. pp. 770-774. Website

Androutsos NA, Nistazakis HE, Stassinakis AN, Tombras GS, Tsigopoulos AD. DF Relayed QAM or DBPSK FSO Links with Generalized Pointing Errors over Mixture Gamma Turbulence Channels. In: 2019 8th International Conference on Modern Circuits and Systems Technologies, MOCAST 2019. ; 2019. Website

Manousou DK, Stassinakis AN, Syskakis E, Nistazakis HE, Gardelis S, Tombras GS. Experimental implementation and theoretical investigation of a vanadium dioxide optical filter for bit error rate enhancement of enhanced space shift keying Visible Light Communication systems. Computation [Internet]. 2019;7. Website

Petavratzis EK, Volos CK, Moysis L, Stouboulos IN, Nistazakis HE, Tombras GS, Valavanis KP. An Inverse Pheromone Approach in a Chaotic Mobile Robot’s Path Planning Based on a Modified Logistic Map. Technologies [Internet]. 2019;7. Website

Khalid H, Sheikh Muhammad S, Nistazakis HE, Tombras GS. Performance analysis of hard-switching based hybrid FSO/RF system over turbulence channels. Computation [Internet]. 2019;7. Website

Androutsos NA, Nistazakis HE, Stassinakis AN, Sandalidis HG, Tombras GS. Performance of SIMO FSO links over mixture composite irradiance channels. Applied Sciences (Switzerland) [Internet]. 2019;9. Website

Roumelas GD, Nistazakis HE, Stassinakis AN, Tombras GS, Volos CK. Triple Hybrid Terresstrial FSO/RF/MMW System with Receiver's Diversity. In: 2019 8th International Conference on Modern Circuits and Systems Technologies, MOCAST 2019. ; 2019. Website

Varotsos GK, Nistazakis HE, Tombras GS, Aidinis K, Jaber F, Mujeeb Rahman KK. On the use of Diversity in Transdermal Optical Wireless Links with Nonzero Boresight Pointing Errors for Outage Performance Estimation. In: 2019 8th International Conference on Modern Circuits and Systems Technologies, MOCAST 2019. ; 2019. Website

Daltzis PA, Volos CK, Nistazakis HE, Tsigopoulos AD, Tombras GS. Analysis, synchronization and circuit design of a 4D hyperchaotic hyperjerk system. Computation [Internet]. 2018;6. Website

Ninos MP, Nistazakis HE, Sandalidis HG, Stassinakis AN, Tombras GS. Block error rate performance of OOK freespace optical links over gamma-gamma turbulence channels with generalised nonzero boresight pointing errors. IET Optoelectronics [Internet]. 2018;12:269-272. Website

Frache G, Nistazakis H, Tombras G. Constructing learning-by-doing pedagogical model for delivering 21st century engineering education. Advances in Science, Technology and Engineering Systems [Internet]. 2018;3:115-124. Website

Varotsos GK, Nistazakis HE, Gappmair W, Sandalidis HG, Tombras GS. DF relayed subcarrier FSO links over Malaga turbulence channels with phase noise and non-zero boresight pointing errors. Applied Sciences (Switzerland) [Internet]. 2018;8. Website

Manousou DK, Stassinakis AN, Syskakis E, Nistazakis HE, Tombras GS, Volos CK, Tsigopoulos AD. Estimation of the influence of Vanadium dioxide optical filters at the performance of visible light communication systems. In: 2018 7th International Conference on Modern Circuits and Systems Technologies, MOCAST 2018. ; 2018. pp. 1-4. Website

Daltzis PA, Gerodimos NA, Volos CK, Nistazakis HE, Tombras GS. Experimental observation of antimonotonicity in a nonlinear R-L-Diode circuit. Journal of Engineering Science and Technology Review [Internet]. 2018;11:72-81. Website

Daltzis P, Vaidyanathan S, Pham V-T, Volos C, Nistazakis E, Tombras G. Hyperchaotic Attractor in a Novel Hyperjerk System with Two Nonlinearities. Circuits, Systems, and Signal Processing [Internet]. 2018;37:613-635. Website

Ninos MP, Nistazakis HE, Stassinakis AN, Tombras GS, Christofilakis V, Tsigopoulos AD. CDMA radio on FSO links over gamma turbulence channels with nonzero boresight pointing errors. In: 2018 7th International Conference on Modern Circuits and Systems Technologies, MOCAST 2018. ; 2018. pp. 1-4. Website

Ninos MP, Nistazakis HE, Sandalidis HG, Tombras GS. CDMA RoFSO Links with Nonzero Boresight Pointing Errors over M Turbulence Channels. IEEE Photonics Journal [Internet]. 2018;10. Website

Varotsos GK, Nistazakis HE, Stassinakis AN, Tombras GS, Christofilakis V, Volos CK. Outage performance of mixed, parallel and serial DF relayed FSO links over weak turbulence channels with nonzero boresight pointing errors. In: 2018 7th International Conference on Modern Circuits and Systems Technologies, MOCAST 2018. ; 2018. pp. 1-4. Website

Petavratzis EK, Volos CK, Stouboulos IN, Kyprianidis IM, Nistazakis HE, Tombras GS. Robot's path planning based on emulated finite resistive grids. In: 2018 7th International Conference on Modern Circuits and Systems Technologies, MOCAST 2018. ; 2018. pp. 1-4. Website

Gerodimos NA, Daltzis PA, Volos CK, Nistazakis HE, Tombras GS. An experimental study of chaotic phenomena in the rl-diode circuit driven by a square wave.; 2017 pp. 315-339. Website

Azar AT, Volos C, Gerodimos NA, Tombras GS, Pham V-T, Radwan AG, Vaidyanathan S, Ouannas A, Munoz-Pacheco JM. A novel chaotic system without equilibrium: Dynamics, synchronization, and circuit realization. Complexity [Internet]. 2017;2017. Website

Katsilieris TD, Latsas GP, Nistazakis HE, Tombras GS. An accurate computational tool for performance estimation of FSO communication links over weak to strong atmospheric turbulent channels. Computation [Internet]. 2017;5. Website

Volos C, Vaidyanathan S, Pham V-T, Nistazakis HE, Stouboulos IN, Kyprianidis IM, Tombras GS. Adaptive control and synchronization of a memristor-based Shinriki’s system. Studies in Computational Intelligence [Internet]. 2017;701:237-261. Website

Varotsos GK, Nistazakis HE, Tombras GS, Gappmair W. Average error performance in Subcarrier PSK FSO links over weak turbulence channels with spatial jitter and phase noise. In: 2017 6th International Conference on Modern Circuits and Systems Technologies, MOCAST 2017. ; 2017. Website

Ninos MP, Nistazakis HE, Tombras GS. On the BER performance of FSO links with multiple receivers and spatial jitter over gamma-gamma or exponential turbulence channels. Optik [Internet]. 2017;138:269-279. Website

Ninos MP, Nistazakis HE, Stassinakis AN, Varotsos GK, Tombras GS, Volos CK. Block error rate estimation for wireless optical communication links over strong turbulence channels with pointing errors. In: 2017 6th International Conference on Modern Circuits and Systems Technologies, MOCAST 2017. ; 2017. Website

Menounou S, Stassinakis AN, Nistazakis HE, Tombras GS, Sandalidis HG. Coverage area estimation for high performance eSSK visible light communication systems. In: 4th Panhellenic Conference on Electronics and Telecommunications, PACET 2017. Vol. 2018-January. ; 2017. pp. 1-4. Website

Varotsos GK, Nistazakis HE, Ninos MP, Tombras GS, Tsigopoulos AD, Volos CK. DF relayed FSO communication systems with time dispersion over Gamma Gamma turbulence and misalignment. In: 2017 6th International Conference on Modern Circuits and Systems Technologies, MOCAST 2017. ; 2017. Website

Ninos MP, Nistazakis HE, Latsas GP, Tombras GS, Konofaos N. PSK OFDM optical wireless communication systems with receiver's diversity over gamma-gamma turbulence channels and spatial jitter. In: 2017 6th International Conference on Modern Circuits and Systems Technologies, MOCAST 2017. ; 2017. Website

Frache G, Nistazakis HE, Tombras GS. Reengineering engineering education: Developing a constructively aligned learning-by-doing pedagogical model for 21st century education. In: IEEE Global Engineering Education Conference, EDUCON. ; 2017. pp. 1119-1124. Website

Ninos MP, Nistazakis HE, Tombras GS, Volos CK. SIMO PPM optical wireless communication system over gamma turbulence channels with generalized pointing errors. In: 4th Panhellenic Conference on Electronics and Telecommunications, PACET 2017. Vol. 2018-January. ; 2017. pp. 1-4. Website

Prousalis DA, Volos CK, Stouboulos IN, Kyprianidis IM, Nistazakis HE, Tombras GS. Chaotic synchronization in coupled neuronal circuits via a memristor. In: 4th Panhellenic Conference on Electronics and Telecommunications, PACET 2017. Vol. 2018-January. ; 2017. pp. 1-4. Website

Varotsos GK, Nistazakis HE, Tombras GS. OFDM RoFSO links with relays over turbulence channels and nonzero boresight pointing errors. Journal of Communications [Internet]. 2017;12:644-660. Website

Varotsos GK, Nistazakis HE, Petkovic MI, Djordjevic GT, Tombras GS. SIMO optical wireless links with nonzero boresight pointing errors over M modeled turbulence channels. Optics Communications [Internet]. 2017;403:391-400. Website

Varotsos GK, Nistazakis HE, Volos CK, Tombras GS. FSO links with diversity pointing errors and temporal broadening of the pulses over weak to strong atmospheric turbulence channels. Optik [Internet]. 2016;127:3402-3409. Website

Giakoumis AE, Volos CK, Stouboulos IN, Kyprianidis IM, Nistazakis HE, Tombras GS. Implementation of a laboratory-based educational tool for teaching nonlinear circuits and chaos. Studies in Computational Intelligence [Internet]. 2016;636:379-407. Website

Varotsos GK, Nistazakis HE, Stassinakis AN, Tombras GS, Volos CK. On the influence of time dispersion at the availability of optical wireless links with diversity and spatial jitter over Malaga-modeled turbulence. In: 2016 5th International Conference on Modern Circuits and Systems Technologies, MOCAST 2016. ; 2016. Website

Stassinakis AN, Nistazakis HE, Varotsos GK, Tombras GS, Tsigopoulos AD, Christofilakis V. Outage capacity estimation of FSO links with pointing errors over gamma turbulence channels. In: 2016 5th International Conference on Modern Circuits and Systems Technologies, MOCAST 2016. ; 2016. Website

Nistazakis HE, Ninos MP, Tsigopoulos AD, Zervos DA, Tombras GS. Performance study of terrestrial multi-hop OFDM FSO communication systems with pointing errors over turbulence channels. Journal of Modern Optics [Internet]. 2016;63:1403-1413. Website

Volos CK, Giakoumis A, Kyprianidis IM, Stouboulos IN, Nistazakis HE, Tombras GS. Synchronization phenomena in coupled non-identical chaotic circuits. Journal of Engineering Science and Technology Review [Internet]. 2016;9:34-38. Website

Nistazakis HE, Stassinakis AN, Sandalidis HG, Tombras GS. QAM and PSK OFDM RoFSO over M-turbulence induced fading channels. IEEE Photonics Journal [Internet]. 2015;7. Website

Papanikolaou CP, Tombras GS, Van De Bogart KL, Stetzer MR. Investigating student understanding of operational-amplifier circuits. American Journal of Physics [Internet]. 2015;83:1039-1050. Website

Nistazakis HE, Stassinakis AN, Sinanović S, Popoola WO, Tombras GS. Performance of quadrature amplitude modulation orthogonal frequency division multiplexing-based free space optical links with non-linear clipping effect over gamma-gamma modelled turbulence channels. IET Optoelectronics [Internet]. 2015;9:269-274. Website

Nistazakis HE, Stassinakis AN, Sheikh Muhammad S, Tombras GS. BER estimation for multi-hop RoFSO QAM or PSK OFDM communication systems over gamma gamma or exponentially modeled turbulence channels. Optics and Laser Technology [Internet]. 2014;64:106-112. Website

Nistazakis HE, Stassinakis AN, Tombras GS, Muhammad SS, Tsigopoulos AD. K modeled turbulence and nonlinear clipping for QAM OFDM with FSO and fiber serially linked. In: 2014 20th International Conference on Microwaves, Radar and Wireless Communications, MIKON 2014. ; 2014. Website

Varotsos GK, Stassinakis AN, Nistazakis HE, Tsigopoulos AD, Peppas KP, Aidinis CJ, Tombras GS. Probability of fade estimation for FSO links with time dispersion and turbulence modeled with the gamma-gamma or the I-K distribution. Optik [Internet]. 2014;125:7191-7197. Website

Gerodimos NA, Daltzis PA, Hanias MP, Nistazakis HE, Tombras GS. Unimodal 1-D maps: Cousins in nature.; 2014 pp. 131-152. Website

Peppas KP, Stassinakis AN, Nistazakis HE, Tombras GS. Capacity analysis of dual amplify-and-forward relayed free-space optical communication systems over turbulence channels with pointing errors. Journal of Optical Communications and Networking [Internet]. 2013;5:1032-1042. Website

Stassinakis AN, Nistazakis HE, Peppas KP, Tombras GS. Improving the availability of terrestrial FSO links over log normal atmospheric turbulence channels using dispersive chirped Gaussian pulses. Optics and Laser Technology [Internet]. 2013;54:329-334. Website

Hanias MP, Nistazakis HE, Tombras GS. Chaotic behavior of transistor circuits. Understanding Complex Systems [Internet]. 2012:59-91. Website

Stassinakis AN, Nistazakis HE, Tombras GS. Comparative performance study of one or multiple receivers schemes for FSO links over gamma-gamma turbulence channels. Journal of Modern Optics [Internet]. 2012;59:1023-1031. Website

Datsikas CK, Peppas KP, Sagias NC, Tombras GS. Serial relaying communications over generalized-gamma fading channels. Wireless Communications and Mobile Computing [Internet]. 2012;12:1191-1202. Website

Xarcha V, Stassinakis AN, Nistazakis HE, Latsas GP, Hanias MP, Tombras GS, Tsigopoulos A. Wavelength diversity/or free space optical systems: Performance evaluation over log normal turbulence channels. In: 2012 19th International Conference on Microwaves, Radar and Wireless Communications, MIKON 2012. Vol. 2. ; 2012. pp. 678-683. Website

Peppas KP, Stassinakis AN, Topalis GK, Nistazakis HE, Tombras GS. Average capacity of optical wireless communication systems over I-K atmospheric turbulence channels. Journal of Optical Communications and Networking [Internet]. 2012;4:1026-1032. Website

Kanellopoulos D, Lalos P, Tombras G. Implementing a zoomable Web browser with annotation features for managing libraries of high quality images. International Journal of Innovative Computing, Information and Control [Internet]. 2012;8:7225-7235. Website

Nistazakis HE, Tombras GS. On the use of wavelength and time diversity in optical wireless communication systems over gamma-gamma turbulence channels. Optics and Laser Technology [Internet]. 2012;44:2088-2094. Website

Peppas KP, Datsikas CK, Sagias NC, Tombras GS. Dual-hop multi-input multi-output relay systems over spatially correlated Nakagami-m fading channels. IET Communications [Internet]. 2011;5:2106-2115. Website

Nistazakis HE, Tsigopoulos AD, Hanias MP, Psychogios CD, Marinos D, Aidinis C, Tombras GS. Estimation of outage capacity for free space optical links over I-K and K turbulent channels. Radioengineering [Internet]. 2011;20:493-498. Website

Sagias NC, Lazarakis FI, Alexandridis AA, Dangakis KP, Tombras GS. Higher order capacity statistics of diversity receivers. Wireless Personal Communications [Internet]. 2011;56:649-668. Website

Nistazakis HE, Assimakopoulos VD, Tombras GS. Performance estimation of free space optical links over negative exponential atmospheric turbulence channels. Optik [Internet]. 2011;122:2191-2194. Website

Nistazakis HE, Katsis A, Tombras GS. On the reliability and performance of FSO and hybrid FSO communication systems over turbulent channels.; 2011 pp. 69-111. Website

Hanias MP, Giannis IL, Tombras GS. Chaotic operation by a single transistor circuit in the reverse active region. Chaos [Internet]. 2010;20. Website

Peppas KP, Datsikas CK, Nistazakis HE, Tombras GS. Dual-hop relaying communications over generalized-K (KG) fading channels. Journal of the Franklin Institute [Internet]. 2010;347:1643-1653. Website

Prosalentis EA, Tombras GS. Elimination of idle tones by a second order 2-bit adaptive sigma delta modulation system. Analog Integrated Circuits and Signal Processing [Internet]. 2010;63:313-320. Website

Datsikas CK, Peppas KP, Lazarakis FI, Tombras GS. Error rate performance analysis of dual-hop relaying transmissions over generalized-K fading channels. AEU - International Journal of Electronics and Communications [Internet]. 2010;64:1094-1099. Website

Sagias NC, Mallik RK, Tombras GS. Error rate performance of multilevel signals with coherent detection. IEEE Transactions on Communications [Internet]. 2010;58:2188-2192. Website

Nistazakis HE, Marinos D, Hanias M, Aidinis C, Tsilis M, Tombras GS, Tsigopoulos AD, Fafalios ME. Estimation of capacity bounds of free space optical channels under strong turbulence conditions. In: 4th Microwave and Radar Week, MRW-2010 - 18th International Conference on Microwaves, Radar and Wireless Communications, MIKON 2010 - Conference Proceedings. ; 2010. Website

Datsikas CK, Peppas KP, Sagias NC, Tombras GS. Serial free-space optical relaying communications over gamma-gamma atmospheric turbulence channels. Journal of Optical Communications and Networking [Internet]. 2010;2:576-586. Website

Datsikas CK, Peppas KP, Sagias NC, Tselikas ND, Tombras GS. Bit error and outage probability of serial relaying communication systems. In: Proceedings - 14th Panhellenic Conference on Informatics, PCI 2010. ; 2010. pp. 85-88. Website

Nistazakis HE, Karagianni EA, Tsigopoulos AD, Fafalios ME, Tombras GS. Average capacity of optical wireless communication systems over atmospheric turbulence channels. Journal of Lightwave Technology [Internet]. 2009;27:974-979. Website

Katsis A, Nistazakis HE, Tombras GS. Bayesian and frequentist estimation of the performance of free space optical channels under weak turbulence conditions. Journal of the Franklin Institute [Internet]. 2009;346:315-327. Website

Nistazakis HE, Tombras GS, Tsigopoulos AD, Karagianni EA, Fafalios ME. Capacity estimation of optical wireless communication systems over moderate to strong turbulence channels. Journal of Communications and Networks [Internet]. 2009;11:384-389. Website

Nistazakis HE, Tsiftsis TA, Tombras GS. Performance analysis of free-space optical communication systems over atmospheric turbulence channels. IET Communications [Internet]. 2009;3:1402-1409. Website

Hanias MP, Avgerinos Z, Tombras GS. Period doubling, Feigenbaum constant and time series prediction in an experimental chaotic RLD circuit. Chaos, Solitons and Fractals [Internet]. 2009;40:1050-1059. Website

Hanias MP, Tombras GS. Time series analysis in a single transistor chaotic circuit. Chaos, Solitons and Fractals [Internet]. 2009;40:246-256. Website

Prosalentis E, Tombras GS. Elimination of idle tones by a 2-bit adaptive sigma-delta modulation system. ETRI Journal [Internet]. 2009;31:393-398. Website

Lalos P, Korres A, Datsikas CK, Tombras GS, Peppas K. A framework for dynamic car and taxi pools with the use of positioning systems. In: Computation World: Future Computing, Service Computation, Adaptive, Content, Cognitive, Patterns, ComputationWorld 2009. ; 2009. pp. 385-391. Website

Hanias MP, Tombras GS. Time series cross prediction in a single transistor chaotic circuit. Chaos, Solitons and Fractals [Internet]. 2009;41:1167-1173. Website

Katsis A, Nistazakis HE, Tombras GS. Bayesian and Frequentist Estimation of the Average Capacity of Log Normal Wireless Optical Channels. In: AIP Conference Proceedings. Vol. 1060. ; 2008. pp. 26-29. Website

Mavromatou C, Tombras GS, Ninos D, Hadjicontis V. Electromagnetic emission memory phenomena related to LiF ionic crystal deformation. Journal of Applied Physics [Internet]. 2008;103. Website

Lalos P, Tombras GS. Introducing JOUNBO: A new advanced online journal and newspaper browser. Journal of Multimedia [Internet]. 2008;3:26-33. Website

Nistazakis HE, Tombras GS, Tsigopoulos AD, Karagianni EA, Fafalios ME. Average capacity of wireless optical communication systems over gamma gamma atmospheric turbulence channels. In: IEEE MTT-S International Microwave Symposium Digest. ; 2008. pp. 1561-1564. Website

Sagias NC, Mallik RK, Tombras GS. Error rate performance of multilevel signals with coherent detection. In: GLOBECOM - IEEE Global Telecommunications Conference. ; 2008. pp. 1152-1156. Website

Datsikas CK, Sagias NC, Lazarakis FI, Tombras GS. Outage analysis of decode-and-forward relaying over Nakagami-m fading channels. IEEE Signal Processing Letters [Internet]. 2008;15:41-44. Website

Michalopoulos DS, Karagiannidis GK, Tombras GS. Symbol error probability of decode and forward cooperative diversity in Nakagami-m fading channels. Journal of the Franklin Institute [Internet]. 2008;345:723-728. Website

Prosalentis EA, Tombras GS. A 2-bit adaptive delta modulation system with improved performance. Eurasip Journal on Advances in Signal Processing [Internet]. 2007;2007. Website

Sagias NC, Tombras GS. On the cascaded Weibull fading channel model. Journal of the Franklin Institute [Internet]. 2007;344:1-11. Website

Datsikas CK, Tombras GS, Sagias NC, Lazarakis FI, Alexandropoulos GC, Alexandridis AA, Dangakis KP. Dual-hop relaying networks over Nakagami-m fading channels. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. ; 2007. Website

Vlassopoulos N, REISIS D, Lentaris G, Tombras G, Prosalentis E, Ritas N, Tsakalis K. An approach for efficient design of digital amplifiers. In: Proceedings - IEEE International Symposium on Circuits and Systems. ; 2006. pp. 5531-5534. Website

Varzakas P, Tombras GS. Spectral efficiency of a single-cell multi-carrier DS-CDMA system in Rayleigh fading. Journal of the Franklin Institute [Internet]. 2006;343:295-300. Website

Sagias NC, Karagiannidis GK, Zogas DA, Tombras GS, Kotsopoulos SA. Average output SINR of equal-gain diversity in correlated Nakagami-m fading with cochannel interference. IEEE Transactions on Wireless Communications [Internet]. 2005;4:1407-1411. Website

Karagiannidis GK, Zogas DA, Sagias NC, Kotsopoulos SA, Tombras GS. Equal-gain and maximal-ratio combining over nonidentical weibull fading channels. IEEE Transactions on Wireless Communications [Internet]. 2005;4:841-846. Website

Hadjicontis V, Tombras GS, Ninos D, Mavromatou C. Memory effects in EM emission during uniaxial deformation of dielectric crystalline materials. IEEE Geoscience and Remote Sensing Letters [Internet]. 2005;2:118-120. Website

Sagias NC, Tombras GS, Karagiannidis GK. New results for the Shannon channel capacity in generalized fading channels. IEEE Communications Letters [Internet]. 2005;9:97-99. Website

Sagias NC, Varzakas P, Tombras GS, Karagiannidis GK. Spectral efficiency for selection combining RAKE receivers over Weibull fading channels. Journal of the Franklin Institute [Internet]. 2005;342:7-13. Website

Zogas DA, Sagias NC, Tombras GS, Karagiannidis GK. Average output SNR of equal-gain diversity receivers over correlative Weibull fading channels. European Transactions on Telecommunications [Internet]. 2005;16:521-525. Website

Varzakas P, Tombras GS. Spectral efficiency of a cellular MC/DS-CDMA system in Rayleigh fading. International Journal of Communication Systems [Internet]. 2005;18:795-801. Website

Sagias NC, Zogas DA, Karagiannidis GK, Tombras GS. Channel capacity and second-order statistics in weibull fading. IEEE Communications Letters [Internet]. 2004;8:377-379. Website

Sagias NC, Karagiannidis GK, Zogas DA, Mathiopoulos PT, Tombras GS, Kotsopoulos SA. Dual selection diversity over correlated Weibull fading channels. In: IEEE International Conference on Communications. Vol. 6. ; 2004. pp. 3384-3388. Website

Sagias NC, Karagiannidis GK, Tombras GS. Error-rate analysis of switched diversity receivers in Weibull fading. Electronics Letters [Internet]. 2004;40:681-682. Website

Sagias NC, Varzakas P, Tombras GS, Karagiannidis GK. Average channel capacity for generalized-selection combining RAKE receivers. European Transactions on Telecommunications [Internet]. 2004;15:497-500. Website

Ninos D, Tombras GS, Mavromatou C, Hadjicontis V. On the detection of acoustic and electromagnetic signals before fracture of dielectric crystalline materials. IEEE Geoscience and Remote Sensing Letters [Internet]. 2004;1:162-165. Website

Sagias NC, Karagiannidis GK, Zogas DA, Mathiopoulos PT, Tombras GS. Performance analysis of dual selection diversity in correlated Weibull fading channels. IEEE Transactions on Communications [Internet]. 2004;52:1063-1067. Website

Sagias NC, Karagiannidis GK, Zogas DA, Mathiopoulos PT, Kotsopoulos SA, Tombras GS. Performance of diversity receivers over non-identical Weibull fading channels. In: IEEE Vehicular Technology Conference. Vol. 59. ; 2004. pp. 480-484. Website

Sagias NC, Karagiannidis GK, Zogas DA, Mathiopoulos PT, Tombras GS, Pavlidou F-N. Second order statistics and channel spectral efficiency for selection diversity receivers in weibull fading. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 3. ; 2004. pp. 2140-2145. Website

Varzakas P, Tombras GS. Optimal hop number of adaptive hybrid DS/FFH CDMA in Rayleigh fading. Electronics Letters [Internet]. 2003;39:557-558. Website

Sagias NC, Zogas DA, Karagiannidis GK, Tombras GS. Performance analysis of switched diversity receivers in Weibull fading. Electronics Letters [Internet]. 2003;39:1472-1474. Website

Sagias NC, Mathiopoulos PT, Tombras GS. Selection diversity receivers in Weibull fading: Outage probability and average signal-to-noise ratio. Electronics Letters [Internet]. 2003;39:1859-1860. Website

Varzakas P, Tombras GS. Spectral efficiency of adaptive hybrid DS/FFH CDMA in Rayleigh fading. Electronics Letters [Internet]. 2003;39:145-147. Website

Varzakas P, Tombras GS. Average channel capacity for Rake receivers. Electronics Letters [Internet]. 2002;38:475-476. Website

Varzakas P, Tombras GS. Spectral efficiency for a hybrid DS/FH code-division multiple-access system in cellular mobile radio. IEEE Transactions on Vehicular Technology [Internet]. 2001;50:1321-1327. Website

Varzakas P, Tombras GS. Estimation of spectral efficiency for MC/DS-CDMA in cellular systems. In: Symposium on Communications and Vehicular Technology, SCVT 2000 - Proceedings. ; 2000. pp. 62-68. Website

Karybakas CA, Tombras GS. Description of a differential pulse-frequency modulator. Analog Integrated Circuits and Signal Processing [Internet]. 1999;19:295-301. Website

Varzakas P, Tombras GS. Spectral efficiency for FDMA and DS-CDMA in cellular systems. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 3. ; 1998. pp. 1121-1125. Website

Varzakas P, Tombras GS. Comparative estimate of user capacity for FDMA and direct-sequence CDMA in mobile radio. International Journal of Electronics [Internet]. 1997;83:133-144. Website

Lazarakis F, Alexandridis AA, Dangakis K, Kostarakis P, Tombras GS. Evaluation of a terrain-based point-to-point propagation model in the 900 MHz band. International Journal of Communication Systems [Internet]. 1997;10:65-71. Website

Varzakas P, Tombras GS. Spectral efficiency of direct-sequence code-division multiple-access in cellular mobile radio. International Journal of Communication Systems [Internet]. 1997;10:247-252. Website

Potirakis SM, Alexakis GE, Tombras GS. Alternative two-port feedback analysis approach. In: Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems. Vol. 1. ; 1996. pp. 156-159. Website

Potirakis SM, Alexakis GE, Tombras GS. Generalized two-port performance evaluation. In: Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems. Vol. 1. ; 1996. pp. 140-143. Website

Papavramidis AC, Tombras GS, Alexakis GE. Developing location and tracing methods for fast moving portables. In: IEEE Symposium on Communications and Vehicular Technology (SCVT). ; 1995. pp. 136-142. Website

Frantzeskakis DJ, Tombras GS, Belia I, Hizanidis K. Nonlinear Dynamics of Femtosecond Optical Solitary Wave Propagation at the Zero Dispersion Point. IEEE Journal of Quantum Electronics [Internet]. 1995;31:183-189. Website

Lazarakis F, Dangakis K, Alexandridis AA, Tombras GS. Field measurements and coverage prediction model evaluation based on a Geographical Information System. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 1. ; 1994. pp. 274-279. Website

Lazarakis F, Dangakis K, Alexandridis AA, Tombras GS. A point-to-point mobile radio prediction model based on effective height estimation for the region of Athens. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 1. ; 1994. pp. 258-262. Website

Papavramidis AC, Tombras GS. System design requirements for mobile communications open to conformance testing. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 4. ; 1994. pp. 1173-1177. Website

Lazarakis F, Tombras GS, Dangakis K. Average channel capacity in a mobile radio environment with Rician statistics. IEICE Transactions on Communications [Internet]. 1994;E77-B:971-977. Website

Papavramidis AC, Tombras GS, Doukas D. Adaptation of land mobile systems for onboard operation. In: Proceedings of 2nd IEEE International Conference on Universal Personal Communications: Gateway to the 21st Century, ICUPC 1993. Vol. 1. ; 1993. pp. 258-263. Website

Tombras GS, Siskos S. An externally triggered CMOS triangle and/or ramp pulse generator. In: 6th Mediterranean Electrotechnical Conference. ; 1992. pp. 291-294. Website

Tombras GS. 1-Bit delayed encoding improves continuously variable slope delta modulator performance. International Journal of Electronics [Internet]. 1992;73:549-554. Website

Papavramidis A, Paschalis A, Myrtue O, Dangakis K, Tombras G, Kostarakis P. A conformance test system for DECT physical layer. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. ; 1992. pp. 357-361. Website

Dangakis K, Tombras G, Paschalis A, Papavramidis A, Kostarakis P. Development of a Conformance Test System for ERMES receivers. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. ; 1992. pp. 660-664. Website

Siskos S, Tombras GS. An externally triggered CMOS triangular pulse generator. International Journal of Electronics [Internet]. 1992;73:615-620. Website

Tombras GS, Courtis C. Implementation and performance of a delayed continuously variable slope delta modulator. In: 6th Mediterranean Electrotechnical Conference. ; 1992. pp. 351-354. Website

Tombras GS. A line coding format for the output of a two-digit adaptive delta modulation system. International Journal of Electronics [Internet]. 1992;73:263-270. Website

Tombras GS, Danelis D, Karybakas CA. Implementation of a two-digit adaptive delta modulator. International Journal of Electronics [Internet]. 1990;69:767-776. Website

Tombras GS, Karybakas CA. New adaptation algorithm for a two-digit adaptive delta modulation system. International Journal of Electronics [Internet]. 1990;68:343-349. Website

Tombras GS, Karybakas CA. Running average error reduces overload noise in delayed delta-modulation systems. International Journal of Electronics [Internet]. 1988;65:1105-1115. Website

Tombras GS, Karybakas CA. Delayed encoding delta-modulation system with optimum performance. International Journal of Electronics [Internet]. 1985;59:343-354. Website