International Journal of Communications

E-ISSN: 1998-4480
Volume 15, 2021

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 15, 2021

Title of the Paper: Design of an Novel Spectrum Sensing Scheme based on Long Short-Term Memory and Experimental Validation


Authors: Nupur Choudhury, Kandarpa Kumar Sarma, Chinmoy Kalita, Aradhana Misra

Pages: 26-32

DOI: 10.46300/9107.2021.15.6     XML

Abstract: Spectrum sensing allows cognitive radio systems to detect relevant signals in despite the presence of severe interference. Most of the existing spectrum sensing techniques use a particular signal-noise model with certain assumptions and derive certain detection performance. To deal with this uncertainty, learning based approaches are being adopted and more recently deep learning based tools have become popular. Here, we propose an approach of spectrum sensing which is based on long short term memory (LSTM) which is a critical element of deep learning networks (DLN). Use of LSTM facilitates implicit feature learning from spectrum data. The DLN is trained using several features and the performance of the proposed sensing technique is validated with the help of an empirical testbed setup using Adalm Pluto. The testbed is trained to acquire the primary signal of a real world radio broadcast taking place using FM. Experimental data show that even at low signal to noise ratio, our approach performs well in terms of detection and classification accuracies, as compared to current spectrum sensing methods.

Title of the Paper: An Enhanced Method of Contactless Charging of Railway Signaling Torch Light


Authors: K. Muthusamy, P. Rajesh, B. Gokulavasan

Pages: 21-25

DOI: 10.46300/9107.2021.15.5     XML

Abstract: Wireless charging, also known as contactless charging (for shorter range), is a method of supplying energy to electrical devices by sending electricity via an air gap. Wireless charging methods have advanced recently, and commercial solutions have been developed, providing a potential option to overcome the energy bottleneck of typically portable battery-powered gadgets. Due to its simplicity and improved user experience, this technology is attracting a wide range of applications, from low-power gadgets to high-power electric cars. However, including wireless charging into the systems raises a number of difficult challenges in terms of implementation, scheduling, and power management. One such application is to convert the existing system of traditional battery powered railway signaling torchlight into a rechargeable type contactless charging system. This provides a better way of increasing the life time of the product and has better compactness. A rechargeable Li-ion battery must be installed in lieu of the old non-rechargeable battery. To achieve satisfactory efficiency, the magnetic resonance coupling technology of contactless charging can be utilized. Through a shorter air gap, electrical power is transmitted from the charging module (main coil) to the Torchlight (secondary coil). Overall, the present system's cost, size are reduced and lifetime is increased.

Title of the Paper: A Social Entrepreneurship Approach for the Development of an Active-Ageing Smartphone Application


Authors: George Papageorgiou, Athanasia Ralli, Sofia A. Xergia

Pages: 17-20

DOI: 10.46300/9107.2021.15.4     XML

Abstract: Trends in the world population are shown to favor the increase market of elderly people aged 65 and over. This creates a new and promising market with many peculiarities and a variety of needs to be satisfied in terms of improving quality of life. The proposed solution to this problem which is investigated in this paper comes from technology. Especially, smart phone technology can lead to the creation of innovative products and services facilitating the elderly in their daily lives. The purpose of this study is to explore how a smart phone application (Active Ageing), could upgrade the quality of life of the elderly people and how to motivate them by making them feel safe and comfortable to go out for a walk. Further, the proposed app development takes a stakeholder’s approach where the society, the state, local actors and private investors, are involved. In this way opportunities can be seized and be a deterministic factor in this new market with many economic, social and environmental benefits. At the same time, the study examines the conceptual framework of an innovative business model which will contribute to the sustainable development of the application in the Greek society by taking a social entrepreneurship approach. Going through a critical literature review in relation to Active Ageing, the benefits and risks of walking, social entrepreneurship, market research methods and smart cities, an appropriate survey instrument was developed for evaluating the potential of the envisioned Active Aging app. Elements in the survey examined key issues that concern the elderly. Specifically, market needs have been identified regarding the necessary information to create confidence, safety, enjoyment and high quality of life in a framework of sustainable mobility.

Title of the Paper: Study of Handover Techniques for 4G Network MIMO Systems


Authors: Jian-Sing Wang, Jeng-Shin Sheu

Pages: 10-16

DOI: 10.46300/9107.2021.15.3     XML

Abstract: For the upcoming 4G systems, network multiple-input multiple-output (MIMO) and inter-cell interference coordination (ICIC) are two of key techniques adopted in 4G systems to mitigate the serious inter-cell interference (ICI) and improve coverage and cell-edge throughput. Network MIMO is referred to as coordinated multi-point (CoMP) in LTE-A. In this paper, we propose a simulation platform to analyze the handover issue for downlink CoMP transmissions in LTE-A cellular systems. Among the variety of ICIC strategies, we apply the widely adopted soft frequency reuse (SFR) and the fractional frequency reuse (FFR) schemes. Both schemes are based on the idea of applying a frequency reuse factor of one in cell-center areas, and a higher reuse factor in cell-edge areas. Therefore, the ICI is reduced at the expense of the available frequency resources for each cell.

Title of the Paper: Interference Aware Routing Protocols for Underlay Cognitive Radio Networks


Authors: Sami Touati, Hatem Boujemaa, Nazha Abed

Pages: 6-9

DOI: 10.46300/9107.2021.15.2     XML

Abstract: In this paper, optimal and sub-optimal routing protocols are proposed for cognitive radio networks. We first investigate optimal routing that consists in searching among all paths, the one that minimizes the end-to-end outage while verifying interference constraint to primary receiver. A sub-optimal one-hop routing is proposed where the best relay is selected in each hop. The last routing protocol consists in decomposing the network in many sub-networks composed of K hops. Then the best route is determined in each of these sub-networks so that the K hops-outage probability is minimized. The proposed K-hops routing allows a good compromise between complexity and performance. The performance of different routing protocols are evaluated through simulation results in terms of outage probability.

Title of the Paper: Optimal Design of Wind/PV/Diesel/Battery Power System for Telecommunication Application in a Remote Algeria


Authors: H. Zeraia, C. Larbes, A. Malek

Pages: 1-5

DOI: 10.46300/9107.2021.15.1     XML

Abstract: Algeria has embarked on an ambitious renewable energy program in order to increase total food production. It has a large number of remote small villages and islands that lack in the electricity, and probability of connecting them with the high voltage gridlines in the near future is very poor due to financial and technical constraints. This paper proposes the use of a PV, wind and diesel generator hybrid system with storage element in order to determine the optimal configuration of renewable energy in ALGERIA. The principals’ interests of this system are the independence production, and the supplying of electric energy in isolated localities. Have at one’s the energetic and economic models, and simulation tools, we effected an optimization study based on mixed productions. For this approach, the energetic resources of sites where are implanted telecommunications systems and their consumption are supposed known. Then the problem is the optimization of electric generators using these resources, enable to have an optimal type system for the powering of telecommunications equipments in rural site of Algeria. Homer (hybrid optimization model for electric renewable) simulation software was used to determine the technical feasibility of the system and to perform the economical analysis of the system.