Practice and Training of Mobile Communication System Based on Virtual Simulation

IntroductionThe popularity of mobile communication systems has increased remarkably during the last decade and the market demand still continues to increase.As a fundamental part of these systems, antenna is one of the most important design issues in modern mobile communication units.Although there are several similar definitions, an antenna can be mainly described as a device, which transforms the electromagnetic waves in an antenna to radiating waves in an unbounded medium such as air in transmitting mode and vice versa in receiving mode.Because antennas are dependent on frequency, they are designed to operate for certain frequency bands.The rapid growth of mobile communication systems has forced to the use of novel antennas for base and mobile station applications (mobile phone, notebook computer, personal digital assistants (PDA), etc.).Earlier, mobile systems were designed to operate for one of the frequency bands of 2G (second generation) systems, which are Digital Cellular System (DCS), Personal Communications Service (PCS) and Global System for Mobile Communications (GSM) networks.Currently, many mobile communication systems use several frequency bands such as GSM 900/1800/1900 bands (890-960 MHz and 1710-1990 MHz); Universal Mobile Telecommunication Systems (UMTS) and UMTS 3G expansion bands (1900-2200 MHz and 2500-2700 MHz); and Wi-Fi (Wireless Fidelity)/Wireless Local Area Networks (WLAN) bands (2400-2500 MHz and 5100-5800 MHz) where the list of frequently used frequency bands is given in Table 1 ( Best, 2008).Conventionally, because a single antenna can not operate at all of these frequency bands of mobile communication, multiple different antennas covering these bands separately should be used.However, usage of many antennas is usually limited by the volume and cost constraints of the applications.Therefore, multiband and wideband antennas are essential to provide multifunctional operations for mobile communication.A multiband antenna in a mobile communication system can be defined as the antenna operating at distinct frequency bands, but not at the intermediate frequencies between bands.For example, a triple band antenna for GSM 900/1800/1900 bands can cover the frequency bands 890-960 MHz and 1710-1990 MHz (Ali et al., 2003); however, it does not operate properly at the frequencies such as 1200 MHz or 2500 MHz.On the other hand, a wideband antenna operates at every frequency points within a given frequency band.For example, a wideband antenna covering UMTS, extended UMTS and WLAN 2400 bands functions at every frequency points www.intechopen.com

Traffic capacity of cellular mobile communications systems

The subject of research in this article is the process of building a mobile communication system that operates under electronic countermeasures. The aim is to develop recommendations for building a wireless mobile communication system that operates effectively in a complex interfering electromagnetic environment. The strategy for building a mobile wireless communication system is based on the use of a grouping of low-altitude UAVs with ultra-wideband signal technology circulating in control and communication channels, with the integration of artificial intelligence elements into its structure. The objective of this study is to ensure the stable and secure operation of a wireless mobile communication system despite electronic countermeasures. The methods of analytical, temporal positional pulse coding, and fuzzy logical inference were used to make decisions on the transfer of service in the network. The following results were obtained. A strategy for building a wireless mobile communication system despite electronic countermeasures has been developed. It is shown that in order to obtain high noise immunity of control and communication channels and to protect information from interception, wireless ultra-wideband communication technology should be used. This will provide large volumes and speeds of information transmission. A technical solution for the design of an ultra-wideband transceiver antenna system is proposed. Moreover, it is recommended to use the results of data processing in a fuzzy decision-making system for the transfer of service between mobile network nodes in conditions of interference. Conclusions. The scientific novelty of the obtained results is as follows. The use of ultra-wideband channels makes it possible to increase the number of control and communication channels in a wireless mobile system almost unlimitedly. The preliminary distribution of orthogonal codes between the channels realizes the process of control and communication without the interception of information and mutual interference. The use of the time-position-pulse coding method prevents the occurrence of intercharacter distortions of the encoding ultrashort pulses. This also reduces the level of distortion of information signals caused by multipath propagation, which guarantees the security of information in the system. The use of a fuzzy decision-making system for the transfer of services between mobile network nodes allows dynamically changing the network topology in real time and maintaining high quality of service under electronic countermeasures.

The convergence of communication and computing (COM2P) has been taken as a promising solution for the sustainable development of mobile communication systems. The introduction of fog computing in future mobile networks makes COM2P possible. This article provides an overview on fog computing enabled mobile communication networks (FogMNW), including network architecture, system capacity and resource management. First, this article analyzes the heterogeneity of FogMNW with both advanced communication techniques and fog computing. Then a heterogeneous communication and hierarchical fog computing network architecture is proposed. With both communication and computing resources, FogMNW is enabled to achieve much higher capacity than conventional communication networks. This has been well demonstrated by the coded multicast scheme. Furthermore, a systematic management of communication and computing resources is necessary for FogMNW. By exploiting the communication load diversity in N cells, a communication load aware CLA scheme can achieve much higher computing resource efficiency than comparing schemes. The performance gap increases with N, and CLA can improve efficiency by more than 100 percent when there are 14 cells.

This paper includes the survey of need and issues/challenges faced for energy efficiency in 5G network and D2D technique to improve energy efficiency without compromising the user experience. Improving the energy efficiency is important part while designing a network. Energy efficient communication is required for energy constrained networks such as ad-hoc networks in which battery powered wireless system need to reduce energy usage. Cellular systems need to be energy efficient, particularly as the battery constraints has been made significant problem in mobile communication. Also, significant part of the energy is absorbed by the base station, which produces a large electricity bill. This has urged energy optimization for the use of mobile phones, the achievement of energy efficiency is of great economic value from both, the operator’s and the consumer’s viewpoint. Keywords: Base station (BS), energy efficiency (EE), device-to-device technology (D2D) Cite this Article Anika Chaudhary, Himanshi, Pooja Rani. Energy efficiency issues and D2D technique in 5G network. Journal of Telecommunication, Switching Systems and Networks . 2020; 7(2): 1–6p.

Genetic Engineering is an important specialized basic course for the students majoring in life sciences. The quality of teaching is directly related to the students' professional quality and innovation ability. In order to improve the teaching quatity and train advanced biotechnical students, we made some reforms to the contents and teaching methods of Genetic Engineering according to the experience accumulated in recent years.

The key technical elements in designing digital mobile satellite communication systems are identified, and tradeoff studies on the transmission parameters of the satellite link, which were based on experience with an experimental system and the results of field trials, on digital maritime and aeronautical satellite communication systems, are described. The future evolution of the various new communication services to be offered in the digital mobile communication systems are discussed. In the digital mobile satellite communication systems which will be operated under the condition of low C/N and with a signal-level fluctuation due to multipath fading etc., it has been found that the most important requirement is to establish the frame synchronization quickly and maintain it stably in addition to the stable carrier/clock tracking, under this severe link condition. >

With the adjustment of economic structure and the rapid development of science and technology, the demand of enterprises for college graduates has changed significantly, and the traditional single skills and basic knowledge are no longer enough to meet the diversified needs of modern enterprises. Enterprises not only require graduates to have solid professional knowledge and technical ability, and can quickly adapt to and use new technologies, but also pay more attention to practical operation ability, problem-solving ability, cross-department and cross-cultural communication and teamwork ability. In addition, professional quality, responsibility, innovation ability and flexibility have also become an important factor in enterprise recruitment. The talent training mode of colleges and universities needs to keep pace with The Times. Through the reform of curriculum system and school-enterprise cooperation, students innovative thinking, practical ability and comprehensive quality should be enhanced to ensure that graduates have the competitiveness to cope with the complex workplace environment.

The mobile phone industry has experienced an explosive growth in recent years. The emerging markets such as China, India, and Brazil contribute this growth. In China, the number of mobile subscribers has already surpassed the number of fixed landline phone subscribers. In Korea and Japan, there is an explosion of mobile and wireless services. The United States are joining too and there were 207.9 million subscribers in 2005 (CTIA, 2006). Mobile e-commerce (m-commerce) makes business mobility a reality; mobile users could access the Internet at any time, from anywhere with handheld devices or laptop. A 3G enabled smart phone enables you to access a wide range of services anywhere and anytime. For example, you can send and receive e-mail, make cinema and restaurant reservations and pay for them, check real train time, look at digital maps, download music and games, and also browse the Internet. Mobile and wireless services are ranging from mobile communication networks to wireless local area networks. The service provided by mobile communication systems has achieved huge success as mobile and wireless communication technologies are converging at fast speed. We will study mobile and wireless communication in relation to mobile phones. Hence, m-commerce is defined as electronic commerce carried out in handheld devices such as smart phone through mobile and wireless communication network.

In this paper, we propose an adaptive grey predictor (AGP) that aims at the short-term fading (STF) of noisy Rayleigh channels in the mobile communication systems. Here, we use a moving window to reduce the degradation by the additive white Gaussian noise and further improve the precision of the STF prediction of the adaptive segmental grey prediction model, GM (1, 1, α, β). Computer simulation results show that choosing an appropriate length of moving windows in the proposed window AGP (WAGP) can obtain better accuracy and large performance improvement on the noisy STF prediction.

Wide-band digital indoor and future mobile communication systems are being developed in the quasi-millimeter and millimeter wave frequency bands. In such high-speed systems, the degradation of transmission quality by multipath fading constitutes a limiting barrier. Multipath fading, which results from reflection, refraction and scattering of radio waves by buildings and other structures, gives rise to more than one path reaching the receiver and produces a distorted version of the transmitted signal. In mobile and indoor communication systems it cannot be eliminated, therefore the multipath channel must be well characterized in order to reduce its effect in the design of such systems. The objective of this research is to study the multipath fading and delay spread effects due to buildings in an urban propagation channel. In particular, the effects of the building materials, shapes and number of buildings on multipath fading are being studied.

In this paper, we describe the development of a GSM-derived regional mobile satellite communication system. We first discuss the market needs of a regional mobile communication system, and stress the technical requirements for such a system to be successful in the commercial world. We then point out the advantages of deriving such a system from the popular GSM standard and discuss the similarities and differences between the two systems. We then describe a system designed by Lockheed Martin Corp., known as ACeS, which serves the telecommunication needs of Asia. The ACeS system works in both the cellular and satellite environments and is designed to make optimal use of the similarities and differences to the GSM system. We end the paper by discussing some challenges in the evolving area of mobile satellite communication systems.

The demand for wireless mobile communications services is growing at an explosive rate, with the anticipation that communication to a mobile device anywhere on the globe at all times will be available in the near future. An array of antennas mounted on vehicles, ships, aircraft, satellites, and base stations is expected to play an important role in fulfilling the increased demand of channel requirement for these services, as well as for the realization of the dream that a portable communications device the size of a wristwatch be available at an affordable cost for such services. This paper is the first of a two-part study. It provides a comprehensive treatment, at a level appropriate to nonspecialists, of the use of an antenna array to enhance the efficiency of mobile communications systems. It presents an overview of mobile communications as well as details of how an array may be used in various mobile communications systems, including land-mobile, indoor-radio, and satellite-based systems. It discusses advantages of an array of antennas in a mobile communications system, highlights improvements that are possible by using multiple antennas compared to a single antenna in a system, and provides details on the feasibility of antenna arrays for mobile communications applications.

A highly innovative global broadband mobile communication system concept

For the development of mobile communication systems of fifth generation (5G) a number of frequency bands are currently proposed in Russian Federation. Since the 5G standard does not yet exist and the requirements for 5G systems are very wide, a detailed analysis is needed to select the frequency band for 5G networks. The article presents the main problems that should be solved in order to implement 5G and whether its requirements can be achieved in the recommended frequency bands. Evaluation of the possibility of using each band was made with regard to the corresponding problems, system goals and link budget estimation. MmWaves may be recommended for the stationary network devices, while for mobile services it is proposed to use frequencies below 6 GHz.