Modern Circuits and Systems Technologies on Communications

A special issue of Technologies (ISSN 2227-7080). This special issue belongs to the section "Information and Communication Technologies".

Deadline for manuscript submissions: closed (1 November 2018) | Viewed by 30559

Special Issue Editors


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Guest Editor
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: antenna design; microwave components design; wireless communications; evolutionary algorithms; machine learning
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: wireless communications; wireless power transfer and applications; optical wireless communications; communications for biomedical engineering; wireless security
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The 7th International Conference on Modern Circuit and System Technologies on Electronics and Communications (MOCAST 2018) will take place in Thessaloniki, Greece, 7–9 May, 2018. The MOCAST technical program includes all aspects of communications and network technologies from antenna design, propagation modeling, wireless communications, network systems and applications. This Special Issue aims at publishing extended versions of top-ranked papers in the area of communications from the conference. MOCAST is technically sponsored by IEEE. Potential topics include, but are not limited to, the following:

  • Antenna design
  • Propagation
  • Communications systems
  • Wireless communications
  • Network systems

Dr. Sotirios Goudos
Prof. Dr. George K. Karagiannidis
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Technologies is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (6 papers)

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Research

13 pages, 1383 KiB  
Article
Efficient Uncertainty Assessment in EM Problems via Dimensionality Reduction of Polynomial-Chaos Expansions
by Christos Salis, Nikolaos Kantartzis and Theodoros Zygiridis
Technologies 2019, 7(2), 37; https://doi.org/10.3390/technologies7020037 - 17 Apr 2019
Cited by 2 | Viewed by 5327
Abstract
The uncertainties in various Electromagnetic (EM) problems may present a significant effect on the properties of the involved field components, and thus, they must be taken into consideration. However, there are cases when a number of stochastic inputs may feature a low influence [...] Read more.
The uncertainties in various Electromagnetic (EM) problems may present a significant effect on the properties of the involved field components, and thus, they must be taken into consideration. However, there are cases when a number of stochastic inputs may feature a low influence on the variability of the outputs of interest. Having this in mind, a dimensionality reduction of the Polynomial Chaos (PC) technique is performed, by firstly applying a sensitivity analysis method to the stochastic inputs of multi-dimensional random problems. Therefore, the computational cost of the PC method is reduced, making it more efficient, as only a trivial accuracy loss is observed. We demonstrate numerical results about EM wave propagation in two test cases and a patch antenna problem. Comparisons with the Monte Carlo and the standard PC techniques prove that satisfying outcomes can be extracted with the proposed dimensionality-reduction technique. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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9 pages, 1307 KiB  
Article
An Energy Efficient Modulation Scheme for Body-Centric Terahertz (THz) Nanonetworks
by Apostolos K. Vavouris, Foteini D. Dervisi, Vasilis K. Papanikolaou, Panagiotis D. Diamantoulakis, George K. Karagiannidis and Sotirios K. Goudos
Technologies 2019, 7(1), 14; https://doi.org/10.3390/technologies7010014 - 22 Jan 2019
Cited by 4 | Viewed by 5080
Abstract
In body-centric communications, energy efficiency is a critical performance metric, while the achievable data rate is not of primary concern. In this paper we present a novel modulation scheme, which can be efficiently used in body-centric terahertz (THz) nanonetworks. The proposed scheme is [...] Read more.
In body-centric communications, energy efficiency is a critical performance metric, while the achievable data rate is not of primary concern. In this paper we present a novel modulation scheme, which can be efficiently used in body-centric terahertz (THz) nanonetworks. The proposed scheme is a combination of the time-spread On-Off keying (TS–OOK) and the pulse position modulation (PPM) and presents lower energy consumption, compared to other existing methods as TS–OOK, at a minor cost to the data rate. Furthermore, another important aspect is that the proposed modulation scheme can be effectively used to mitigate the impact of the specific kind of noise in THz body-centric communications, thus leading to better error performance. Finally, we present analytical and simulation results in order to compare the new scheme with the existing TS–OOK. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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16 pages, 471 KiB  
Article
Characterization of Fading Statistics of mmWave (28 GHz and 38 GHz) Outdoor and Indoor Radio Propagation Channels
by Sardar Muhammad Gulfam, Syed Junaid Nawaz, Konstantinos B. Baltzis, Abrar Ahmed and and Noor M. Khan
Technologies 2019, 7(1), 9; https://doi.org/10.3390/technologies7010009 - 09 Jan 2019
Cited by 4 | Viewed by 6243
Abstract
Extension of usable frequency spectrum from microwave to millimeter-wave (mmWave) is one of the key research directions in addressing the capacity demands of emerging 5th-generation communication networks. This paper presents a thorough analysis on the azimuthal multipath shape factors and second-order fading statistics [...] Read more.
Extension of usable frequency spectrum from microwave to millimeter-wave (mmWave) is one of the key research directions in addressing the capacity demands of emerging 5th-generation communication networks. This paper presents a thorough analysis on the azimuthal multipath shape factors and second-order fading statistics (SOFS) of outdoor and indoor mmWave radio propagation channels. The well-established analytical relationship of plain angular statistics of a radio propagation channel with the channel’s fading statistics is used to study the channel’s fading characteristics. The plain angle-of-arrival measurement results available in the open literature for four different outdoor radio propagation scenarios at 38 GHz, as well as nine different indoor radio propagation scenarios at 28 GHz and 38 GHz bands, are extracted by using different graphical data interpretation techniques. The considered quantifiers for energy dispersion in angular domain and SOFS are true standard-deviation, angular spread, angular constriction, and direction of maximum fading; and spatial coherence distance, spatial auto-covariance, average fade duration, and level-crossing-rate; respectively. This study focuses on the angular spread analysis only in the azimuth plane. The conducted analysis on angular spread and SOFS is of high significance in designing modulation schemes, equalization schemes, antenna-beams, channel estimation, error-correction techniques, and interleaving algorithms; for mmWave outdoor and indoor radio propagation environments. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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15 pages, 1658 KiB  
Article
Mixed Topology of DF Relayed Terrestrial Optical Wireless Links with Generalized Pointing Errors over Turbulence Channels
by George K. Varotsos, Hector E. Nistazakis, Argyris N. Stassinakis, Christos K. Volos, Vasileios Christofilakis and George S. Tombras
Technologies 2018, 6(4), 121; https://doi.org/10.3390/technologies6040121 - 17 Dec 2018
Cited by 15 | Viewed by 4334
Abstract
This study investigated the outage performance of a terrestrial FSO communication system that uses mixed series and parallel decode-and-forward (DF) relay-assisted (i.e., cooperative diversity) configurations, taking into account the influence of both atmospheric turbulence and pointing error effects. Turbulence-induced optical signal fading is [...] Read more.
This study investigated the outage performance of a terrestrial FSO communication system that uses mixed series and parallel decode-and-forward (DF) relay-assisted (i.e., cooperative diversity) configurations, taking into account the influence of both atmospheric turbulence and pointing error effects. Turbulence-induced optical signal fading is modeled by gamma-gamma or the negative exponential distribution for weak to strong and saturated turbulence conditions, respectively. Additionally, weak to strong non-zero boresight misalignment-induced optical signal fading is modeled by the generalized Beckmann distribution. Under these conditions, an outage analysis of the examined FSO system is performed, in terms of both outage probability and mean outage duration metrics. Thus, fairly accurate closed-form mathematical expressions for both performance metrics are derived, while their corresponding analytical results demonstrate concrete performance and availability improvements for the total FSO system, especially when the number of the connected in parallel DF relays increases. Moreover, the obtained results are verified through the corresponding simulation results. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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22 pages, 1139 KiB  
Article
Trading off Network Density with Frequency Spectrum for Resource Optimization in 5G Ultra-Dense Networks
by Georgios P. Koudouridis and Pablo Soldati
Technologies 2018, 6(4), 114; https://doi.org/10.3390/technologies6040114 - 01 Dec 2018
Cited by 1 | Viewed by 4535
Abstract
To effectively increase the capacity in 5G wireless networks requires more spectrum and denser network deployments. However, due to the increasing network density, the coordination of network and spectrum management becomes a challenging task both within a single operator’s network and among multiple [...] Read more.
To effectively increase the capacity in 5G wireless networks requires more spectrum and denser network deployments. However, due to the increasing network density, the coordination of network and spectrum management becomes a challenging task both within a single operator’s network and among multiple operators’ networks. In this article, we develop new radio resource management (RRM) algorithms for adapting the frequency spectrum and the density of active access nodes in 5G ultra-dense networks (UDNs) to the traffic load and the user density in different geographical areas of the network. To this end, we formulate a network optimization problem where the allocation of spectrum bandwidth and the density of active access nodes are optimized to minimize a joint cost function, and we exploit Lagrange duality techniques to develop provably optimal network-scheduling algorithms. In particular, we develop density algorithms for two application scenarios. The first scenario solves the resource management problem for an operator of an ultra-dense network with exclusive access to a pool of frequency resources, while the second scenario applies to the management of the network density of collocated UDNs that belong to multiple operators sharing the same frequency spectrum. Simulation results demonstrate how effectively the algorithms can adapt the allocation of the spectrum allocation and the density of active access nodes over space and time. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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11 pages, 1253 KiB  
Article
Signal Quality Assessment for Transdermal Optical Wireless Communications under Pointing Errors
by Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos and George K. Karagiannidis
Technologies 2018, 6(4), 109; https://doi.org/10.3390/technologies6040109 - 19 Nov 2018
Cited by 18 | Viewed by 4329
Abstract
In this paper, we assess the signal quality of the out-body to in-body optical communication link, which can be used as a fundamental enabler of novel biomedical appliances, such as medical implants, as well as biological and chemical components monitoring. In particular, we [...] Read more.
In this paper, we assess the signal quality of the out-body to in-body optical communication link, which can be used as a fundamental enabler of novel biomedical appliances, such as medical implants, as well as biological and chemical components monitoring. In particular, we present a mathematical understanding of the transdermal system, which takes into account the optical channel characteristics, the integrated area limitations of the in-body unit, the transceivers’ pointing errors and the particularities of the optical units. Moreover, to accommodate the propagation characteristics, we present a novel simplified, but accurate, transdermal path-gain model. Finally, we extract low-complexity closed-form expressions for the instantaneous and average signal to noise ratio of the transdermal optical link (TOL). Numerical and simulation results are provided for several insightful scenarios and reveal that pointing errors can significantly affect the reliability and effectiveness of the TOL; hence, it should be taken into account in the analysis and design of such systems. Full article
(This article belongs to the Special Issue Modern Circuits and Systems Technologies on Communications)
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