scholarly journals A Power Control Algorithm Based on Chicken Game Theory in Multi-Hop Networks

Symmetry ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 718 ◽  
Author(s):  
Jinpeng Wang ◽  
Ye Zhengpeng ◽  
Jeremy Gillbanks ◽  
Tarun M. Sanders ◽  
Nianyu Zou

With the development of modern society, there are not only many voice calls being made over wireless communication systems, but there is also a great deal of demand for data services. There are increasing demands from the general public for more information data, especially for high-speed services with elevated Gbps levels. As is well known, higher sending power is needed once data rates increase. In order to solve this problem, virtual cellular networks (VCNs) can be employed in order to reduce these peak power shifts. If a VCN works well, mobile ports will receive their own wireless signals via individual cells, and then, the signals will access core networks with the help of a central terminal. Power control can improve the power capacity in multi-hop networks. However, the use of power control will also have a negative impact on network connectivity, delay, and capacity. In order to address the problem, this paper compares specific control methods and capacities in multi-hop networks. Distributed chicken game algorithm power control (DCGAPC) methods are presented in order to reach acceptable minimum levels of network delay and maximum network capacity and connectivity. Finally, a computer simulation is implemented, and the results are shown.

Author(s):  
Amevi Acakpovi ◽  
Dominique Kogue ◽  
Koudjo Mawuefam Koumadi ◽  
Ibrahim Tahirou

<span lang="EN-US">Femtocells can significantly boost up wireless cellular network capacity by reducing communication distances to user equipment and also by reusing resources already utilized in the macrocell network on which they overlay. However, the deployment of femtocells within a macrocell coverage area, causes severe interference between the femtocell and the macrocell, which may have an impact on the overall performance of the femtocells. Avoiding such interference is very important for the effective co-existence </span><span lang="EN-US">of femtocells and macrocell. This paper proposes an algorithm to mitigate cross-tier interference between </span><span lang="EN-US">a femtocell and a macrocell using adaptive power control. The proposed approach is modeled and simulated using MATLAB. The impact on the performance of the </span><span lang="EN-US">femtocell using the proposed algorithm </span><span lang="EN-US">is analysed. Results show that the proposed adaptive power control algorithm has tremendously reduced the negative effects on the system throughput, delay and outage probability for voice and data traffics.</span>


Author(s):  
Adel' Kovalev ◽  
Yury Vasil'evich Kolotilov

Currently, the bulk of the information necessary for the implementation of supervisory control and the controllability of electrical equipment comes from telemechanics systems. A prerequisite for the construction of new electric power facilities or for the reconstruction of old ones is the introduction of telemechanics systems. Telemechanics systems are actively developing and improving. Initially, all of them consisted of a controlled telemechanics center that monitors and controls the system, receiving and processing analog signals from analog measuring transducers via numerous direct cable communication lines. The main disadvantages of such an organization of telemechanical systems include a large amount of connecting cables, scaling difficulties and low metrological characteristics. With the advent of digital transmitters, it became possible to transmit signals from them in digital form, which reduced the number of connecting lines and simplified the scaling and fault tolerance of systems. Now with the help of one measuring transducer it is possible to measure several parameters at once. The main measured parameters of power plants include: current strength, phase voltages, AC frequency, active, reactive and apparent power. This article describes the organization of the telemechanics and communication systems of the Astrakhan TPP-2. The analysis of the existing station power control algorithm is given. A variant of its modification is proposed. An example of the implementation of the proposed modification of the algorithm is described.


2020 ◽  
Vol 10 (7) ◽  
pp. 2446
Author(s):  
Wenying Gu ◽  
Qi Zhu

In mobile communication systems, device-to-device (D2D) communication and nonorthogonal multiple access (NOMA) are effective ways to improve spectrum efficiency and system throughput. In the NOMA-based D2D system, social relationship among D2D users is introduced to form D2D clusters, and NOMA is used for many-to-one communication in each D2D cluster. This paper proposes a joint channel allocation and power control algorithm which decomposes the resource allocation problem into two subproblems: channel allocation and power control. Matching theory is utilized to allocate channels for D2D clusters and sequential convex programming is applied to transform the optimization target to a convex problem before solving it via genetic algorithm. Simulation results indicate the superiority of our algorithm in improving the system throughput on the basis of meeting users’ needs for files.


Author(s):  
Євген Миколайович Мануйлов ◽  
Юрій Юрійович Калиновський

Problem setting. Nowadays, social networks have become an integral part of communication processes in society. The influence of social networks on the socio-cultural development of Ukraine has both positive and negative manifestations, since both values and antivalues are spread in these communication systems, there are subjects who are guided by the norms of morality and law, and those who neglect them, direct their efforts to the harmonization of a certain sphere of public life, or vice versa, produces xenophobic sentiments, inciting enmity in the domestic society at the cultural, national, religious and other levels. Recent research and publications analysis. Significant numbers of scientific works are aimed at elucidating the signs and criteria of deviating as a social phenomenon. According to A. Demkiv, those values, the worldview and behavior that deviate from the organizational culture that exist in a certain social community are considered deviant. In the context of this research, it is important to note A. Khlebnikova's reflections on the recognition and determination of the axiological status of the social network in modern society and the scientific work of P. Kravchenko, which proves that religion, morality, values, language, traditions contribute to the internal consolidation of local social groups, and in this process, social networks perform a leading role. Researchers A. Onishchenko, V. Gorovoy, V. Popik and others devoted their scientific research to uncovering the negative impact of social networks on the development of the Ukrainian state and its socio-cultural and informational spheres. Paper objective. This research involves the disclosure of the negative impact of value deviations of social network subjects on the domestic socio-cultural area, information and spiritual security of Ukraine. Paper main body. The wide range of values presented in social networks has a consolidating, humanistic nature – they are reproduced by scientific and creative communities, spiritual and cultural associations, volunteer and human rights organizations, and so on. In turn, anti-values are presented in the content of extremist organizations, xenophobic associations of various orientations, which creates an ideological basis for the emergence of social conflicts, disintegration processes, and civil confrontation. Thus, social networks have become an influential actor in the development of the socio-cultural, spiritual, value, information space of our country. Considering Ukrainian society as a holistic formation, it is worth noting that value deviations are those ideas about the ways of being and about spiritual life that do not correspond to the humanistic and national guidelines for the democratic development of Ukrainian society. In the context of the research, worldview guidelines that contradict moral attitudes, existing legal norms, accepted traditions of the domestic society, etc. can be considered as value deviations in social networks. Freedom in social networks has a dual manifestation: on the one hand, it is free opportunities for self-realization of individuals and diverse perspectives for the development of the country's socio‑cultural space, and on the other hand, freedom in social networks creates conditions for the popularization of antihuman attitudes, pseudo-values, xenophobic ideologies and worldview systems. Conclusions of the research.  The value deviations of social network subjects are a logical continuation of the deformations of the moral, political, legal, spiritual and other humanistic direction attitudes that are widespread in Ukrainian society. Undoubtedly, the influence of value deviations on domestic socio-cultural development is destructive and it can manifest itself in illegal, immoral, aggressive models of behavior.


Author(s):  
Hao Xu ◽  
Lu Yan ◽  
Haixiang Liu ◽  
Ke Li ◽  
Jian Wang

AbstractIn this paper, the secure transmission for high-speed railway (HSR) communication system is studied. The considered HSR wireless communication system consists of a macro base station, B roadside base stations, and K vehicle stations (VSs) on the top of the train, and the eavesdropping user is a mobile unmanned aerial vehicle (UAV). We consider maximizing the sum of the minimum security rate of each time slot as the objective function, and the constraint conditions contain the quality of service (QoS), switch requirements and the total power constraint. The original optimization problem is mixed-integer and non-convex, it is intractable to solve directly. The block coordinate descent (BCD) method is applied, and the original problem can be decoupled into two sub-problems. The one is the joint BS-VS association problem, and the other is the power control problem. The first sub-problem of optimizing BS-VS association can be solved by the successive convex approximation (SCA) algorithm, and the second one of optimizing transmit power can be solved by the lagrangian dual method. Simulation results show that the proposed algorithms have good convergence.


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