Publications

@article{vassilakis2017efficient,

title = {On the Efficient Radio Resource Allocation in SDN/NFV Based Mobile Cellular Networks under the Complete Sharing Policy},

author = {Vassilios G. Vassilakis and Ioannis Moscholios and Michael D. Logothetis},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {IET Networks},

publisher = {IET Digital Library},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dalamagkas2017dynamic,

title = {Dynamic scheduling in TWDM-PONs using game theory},

author = {Christos Dalamagkas and Panagiotis Sarigiannidis and Stelios Kapetanakis and Ioannis Moscholios},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {Optical Switching and Networking},

publisher = {Elsevier},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Thraskias2016,

title = {A Direct Formula for Ultra-Large Effective Area Fibers Design With Top-Hat Intensity Profile},

author = {Christos A. Thraskias and Anthony C. Boucouvalas},

url = {https://ieeexplore.ieee.org/document/7784823},

doi = {10.1109/JQE.2016.2640225},

year  = {2016},

date = {2016-12-15},

urldate = {2017-02-01},

journal = {IEEE Journal of Quantum Electronics},

volume = {53},

number = {1},

pages = {1-8},

publisher = {IEEE},

abstract = {In this paper, we present a new refractive index profile, in simple easy to use equation form, which allows the design of large mode area (LMA) single mode (SM) optical fibers with the special property of supporting “perfect top-hat” mode profiles. The few parameters of this formula define the refractive index profile of such fibers. We show the effect the parameters of the refractive index profile have on the desired mode field. By applying this direct formula, we avoid the use of complex inverse refractive index reconstruction methods, or time-consuming iterative design processes. We demonstrate this formula with a number of example designs of LMA SM optical fibers with perfect flat-top electric field profile and an effective mode area (Aeff) size that in some cases exceeds the 4800 μm 2 . We expect such LMA SM top-hat fiber design to be useful for the mitigation of non-linear effects and catastrophic optical damage, as well as for achieving uniform intensity deposition on the target...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{mousa2016indoor,

title = {Indoor localization system utilizing two visible light emitting diodes},

author = {Farag IK Mousa and Hoa Le-Minh and Zabih Ghassemlooy and Xuewu Dai and Son T Tran and Anthony C. Boucouvalas and Shien-Kuei Liaw},

doi = {https://doi.org/10.1117/1.OE.55.11.116114},

year  = {2016},

date = {2016-11-29},

urldate = {2016-01-01},

journal = {Optical Engineering},

volume = {55},

issue = {11},

pages = {116114},

publisher = {International Society for Optics and Photonics},

abstract = {Indoor positioning or localization based on visible light communications (VLC) is an emerging technology with wide applications. In conventional localization schemes, the trilateration technique is widely used with at least three separate lighting sources to determine the user’s location. An indoor VLC positioning scheme based on the optical power distributions of only two light emitting diodes (LEDs) is reported for different environments. We have used two received signal strength indications to determine the user’s position based on the LEDs configuration offering less complexity. We propose comprehensive mathematical models for the VLC localization system considering the noise and its impact on the user’s location, and numerically evaluated it over a range of signal-to-noise ratios (SNRs). In addition, it is compared to the results with the exiting trilateration technique. The performance of the proposed system is evaluated with a reported accuracy of <20  cm for an SNR of >13  dB.

},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{boucouvalas2016underwater,

title = {Underwater optical wireless communications with optical amplification and spatial diversity},

author = {Anthony C. Boucouvalas and Kostas Peppas and Konstantinos Yiannopoulos and Zabih Ghassemlooy},

url = {https://ieeexplore.ieee.org/document/7563453},

doi = {https://doi.org/10.1109/LPT.2016.2607278},

year  = {2016},

date = {2016-09-08},

urldate = {2016-01-01},

journal = {IEEE Photonics Technology Letters},

volume = {28},

issue = {22},

pages = {2613-2616},

publisher = {IEEE},

abstract = {This letter investigates the performance of underwater optical wireless communication (UOWC) systems employing optical pre-amplification as well as multiple receivers to exploit the advantages of spatial diversity. Numerical results are further provided to evaluate the error performance of pre-amplified single-input multiple-output UOWC systems when ON-OFF keying modulation is utilized. Our results reveal that the proposed system configuration can indeed offer significant system performance enhancements in terms of the attainable bit-error rate},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{thraskias2016design,

title = {Design of arbitrary shape higher order mode electric field in optical fibers for high power applications},

author = {Christos A. Thraskias and Anthony C. Boucouvalas},

url = {https://ieeexplore.ieee.org/document/7563336},

doi = {https://doi.org/10.1109/JLT.2016.2607125},

year  = {2016},

date = {2016-09-08},

urldate = {2016-01-01},

journal = {Journal of Lightwave Technology},

volume = {34},

issue = {21},

pages = {5056-5062},

publisher = {IEEE},

abstract = {In this paper, we present a new and efficient technique for the exact reconstruction of large mode area (LMA) higher order mode (HOM) optical fibers by using arbitrary shape HOM electric field profiles. One known strategy to achieve LMAs for high power optical applications is by using optical fibers supporting multimode operation, and engineering these fibers such that they operate on just a single transverse mode. Although the fundamental mode is preferred in most circumstances, there is an increasing interest in operating on a single HOM instead since these can have interesting dispersion characteristics and also significantly higher ability to scale mode areas. An issue with the use of HOMs in high power applications is that often they demonstrate regions of high field intensity across the core. This leads to problems with optical damage at lower values of effective area than might otherwise be expected. In order to avoid this problem, we offer designs of optical fibers supporting mode-flattened HOM electric fields. We develop a new inverse transmission line technique for calculating directly and accurately the refractive index profiles of such fibers from knowledge of the desired HOM electric field. We demonstrate this algorithm with a number of example reconstructions of LMA HOM optical fibers supporting prescribed mode-flattened electric field profiles with ultralarge effective mode areas We expect such fiber designs to be useful in the mitigation of nonlinear effects and in thermal and damage management.

},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sagias2017optimal,

title = {Optimal combiners in pre-amplified optical wireless systems under medium-to-strong atmospheric turbulence},

author = {Nikos C. Sagias and Anthony C. Boucouvalas and Konstantinos Yiannopoulos and Murat Uysal and Zabih Ghassemlooy},

doi = {10.1515/ipc-2016-0002},

year  = {2016},

date = {2016-03-01},

urldate = {2017-01-01},

journal = {Image Processing & Communications},

volume = {21},

number = {1},

pages = {25-34},

abstract = {In this work we analytically investigate optimal combiners for pre-amplified diversity receivers that operate under medium-to-strong atmospheric turbulence. We first demonstrate that the combiner performance is strongly affected by the existence of a signal-amplified spontaneous emission beat noise at the output of the photodetector. Due to the signal-dependent nature of noise, the optimal combiner can be classified as a hybrid one, of which performance is between the well-known equal-gain and maximal-ratio combiner architectures. Having established the optimal design, we further assess the proposed combiner performance over gamma-gamma and negative-exponential fading environments.

},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kosmatos2016dominant,

title = {Dominant handover algorithms for vehicular Radio-over-Fiber networks at 60 GHz: A performance evaluation study},

author = {Evangelos A Kosmatos and Nikolaos D. Tselikas},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Performance Evaluation},

volume = {102},

pages = {21--33},

publisher = {North-Holland},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016blocking,

title = {Blocking probabilities of elastic and adaptive calls in the Erlang multirate loss model under the threshold policy},

author = {Ioannis Moscholios and Michael D. Logothetis and Anthony C. Boucouvalas},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Telecommunication Systems},

volume = {62},

number = {1},

pages = {245--262},

publisher = {Springer US},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{boucouvalas2016extending,

title = {Extending the Limits in Optical-Fiber Design for Higher Power Applications Using Inverse Transmission-Line Techniques},

author = {Anthony C. Boucouvalas and Christos A Thraskias},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IEEE Journal of Selected Topics in Quantum Electronics},

volume = {22},

number = {2},

pages = {125--131},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016probabilistic,

title = {A probabilistic threshold-based bandwidth sharing policy for wireless multirate loss networks},

author = {Ioannis Moscholios and Vassilios G. Vassilakis and Michael D. Logothetis and Anthony C. Boucouvalas},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IEEE Wireless Communications Letters},

volume = {5},

number = {3},

pages = {304--307},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016call,

title = {Call blocking probabilities of multirate elastic and adaptive traffic under the Threshold and Bandwidth Reservation policies},

author = {Ioannis Moscholios and Michael D Logothetis and Anthony C. Boucouvalas and Vassilios G Vassilakis},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Journal of Telecommunications and Information Technology},

number = {1},

pages = {44--52},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{boucouvalas2016introduction,

title = {Introduction to the Issue on Optical Waveguide Technology and Applications},

author = {Anthony C. Boucouvalas and Alan Wilner and Michael Zervas and Stuart Walker and Levi Schächterr},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IEEE Journal of Selected Topics in Quantum Electronics},

volume = {22},

number = {2},

pages = {5--7},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{papageorgiou2016quantum,

title = {Quantum Superlattices, Wannier Stark Ladders and the'Resonance'technique},

author = {Christos D. Papageorgiou and Anthony C. Boucouvalas and TE Raptis},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {arXiv preprint arXiv:1606.04584},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{wu2016effect,

title = {Effect of optimal Lambertian order for cellular indoor optical wireless communication and positioning systems},

author = {Dehao Wu and Zabih Ghassemlooy and Wen-De Zhong and Mohammad-Ali Khalighi and Hoa Le Minh and Chen Chen and Stanislav Zvanovec and Anthony C. Boucouvalas},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Optical Engineering},

volume = {55},

number = {6},

pages = {066114--066114},

publisher = {International Society for Optics and Photonics},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{peppas2016semiconductor,

title = {Semiconductor optical amplifiers for underwater optical wireless communications},

author = {Kostas P Peppas and Anthony C. Boucouvalas and Zabih Ghassemloy and Mohhamad-Ali Khalighi and Konstantinos Yiannopoulos and Nikos C. Sagias},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IET Optoelectronics},

volume = {11},

number = {1},

pages = {15--19},

publisher = {IET Digital Library},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sagias2016optimal,

title = {Optimal combiners in pre-amplified optical wireless systems under medium-to-strong atmospheric turbulence},

author = {Nikos Sagias and Anthony C. Boucouvalas and Konstantinos Yiannopoulos and Murat Uysal and Zabih Ghassemlooy},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Image Processing & Communications},

volume = {21},

number = {1},

pages = {25--34},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vassilakis2016uplink,

title = {Uplink Blocking Probabilities in Priority-Based Cellular CDMA Networks with Finite Source Population},

author = {V Vassilakis and Ioannis Moscholios and M Logothetis},

year  = {2016},

date = {2016-01-01},

journal = {IEICE Transactions on Communications},

volume = {99},

number = {6},

pages = {1302--1309},

publisher = {The Institute of Electronics, Information and Communication Engineers},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vassilakis2016software,

title = {A Software-Defined Architecture for Next-Generation Cellular Networks},

author = {Vassilios G. Vassilakis and Ioannis Moscholios and B Alzahrani and M Logothetis},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IEEE ICC 2016},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016congestion,

title = {Congestion probabilities in erlang-engset multirate loss models under the multiple fractional channel reservation policy},

author = {Ioannis Moscholios},

year  = {2016},

date = {2016-01-01},

journal = {Image Processing & Communications},

volume = {21},

number = {1},

pages = {35--46},

publisher = {De Gruyter},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vassilakis2016calculating,

title = {Calculating distributed denial of service attack probability in bloom-filter based information-centric networks},

author = {Vassilios G. Vassilakis and Liang Wang and Ioannis Moscholios and Michael D. Logothetis},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Image Processing & Communications},

volume = {21},

number = {1},

pages = {7--23},

publisher = {De Gruyter},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{vassilakis2016quality,

title = {Quality of service differentiation in heterogeneous CDMA networks: a mathematical modelling approach},

author = {Vassilios Vassilakis and Ioannis Moscholios and Michael Logothetis},

year  = {2016},

date = {2016-01-01},

journal = {Wireless Networks},

pages = {1--17},

publisher = {Springer US},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016multirate,

title = {A Multirate Loss Model for Quasi-Random Traffic under the Multiple Fractional Channel Reservation Policy},

author = {Ioannis Moscholios},

year  = {2016},

date = {2016-01-01},

publisher = {IEICE ICTF},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{moscholios2016calld,

title = {Call Blocking Probabilities in an Erlang Multirate Loss Model under a State-dependent Threshold Policy},

author = {Ioannis Moscholios},

year  = {2016},

date = {2016-01-01},

publisher = {IEICE ICTF},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{7563453,

title = {Underwater Optical Wireless Communications With Optical Amplification and Spatial Diversity},

author = {Anthony C. Boucouvalas and Kostas P. Peppas and Konstantinos Yiannopoulos and Zabih Ghassemlooy},

doi = {10.1109/LPT.2016.2607278},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IEEE Photonics Technology Letters},

volume = {28},

number = {22},

pages = {2613-2616},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{https://doi.org/10.1049/iet-net.2015.0070,

title = {Burst-by-burst dynamic bandwidth allocation for XG-PONs},

author = {Ilias Gravalos and Konstantinos Yiannopoulos and Georgios Papadimitriou and Emmanouel (Manos) Varvarigos},

url = {https://ietresearch.onlinelibrary.wiley.com/doi/abs/10.1049/iet-net.2015.0070},

doi = {https://doi.org/10.1049/iet-net.2015.0070},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {IET Networks},

volume = {5},

number = {3},

pages = {47-55},

abstract = {The authors propose and evaluate the performance of a dynamic bandwidth allocation algorithm, namely burst-by-bUrst dynamic bandwidth allocation (BUDA), which enables the fair and efficient utilisation of the available upstream resources in 10-Gigabit-capable passive optical networks (XG-PONs). The proposed algorithm emulates a bit-by-bit burst multiplexing process based on the fair queuing scheduling principle to fairly allocate the available upstream bandwidth among several end-users with varying traffic demands. The fair queuing approach is well-suited to the strictly synchronous communication model of XG-PONs, where fixed duration downstream and upstream frames are utilised to delineate transmissions, and the authors demonstrate via simulations that BUDA achieves low and bounded latency, as well as resource allocation fairness over a set of different traffic loads. Furthermore, BUDA is compared with well-known bandwidth allocation algorithms and a significant latency and fairness benefit is demonstrated.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{chaniotis2015node,

title = {Is Node. js a viable option for building modern web applications? A performance evaluation study},

author = {Ioannis K Chaniotis and Kyriakos-Ioannis D Kyriakou and Nikolaos D. Tselikas},

year  = {2015},

date = {2015-01-01},

journal = {Computing},

volume = {97},

number = {10},

pages = {1023--1044},

publisher = {Springer Vienna},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kapitsaki2015insight,

title = {An insight into license tools for open source software systems},

author = {Georgia M Kapitsaki and Nikolaos D. Tselikas and Ioannis E Foukarakis},

year  = {2015},

date = {2015-01-01},

urldate = {2015-01-01},

journal = {Journal of Systems and Software},

volume = {102},

pages = {72--87},

publisher = {Elsevier},

keywords = {},

pubstate = {published},

tppubtype = {article}

}