Current Situation and Development Trend of Mobile Communication Systems

Abstract

This paper introduces the development background of mobile communication and the development of mobilecommunication. It introduces the application principle, network structure, main technology, the advantages anddisadvantages of the three generations of mobile communication system respectively, and introduces the currentthird generation mobile communication system, including its technical support and research direction, analysis andcomparison of the European WCDMA system, the United States CDMA2000 system and China's TD-SCDMA systemtechnical characteristics. Finally, the development trend and prospect of future mobile communication system arediscussed.

Research Status and Prospect of Embedded System

“…Compared with other operating systems, embedded operating systems generally have only microkernel, no shell and graphical user interface, and even some other functions can be removed. Because of the requirement of its embeddedness, generally speaking, the operating system and application program are closely combined to make them run in the same space together [11]. The difference between the operating system and application program is not very clear.…”

“…In this form, many substations adopt unattended management mode. By using embedded network servers, the labor intensity of substation managers can be effectively reduced, and the hidden trouble of substation can be found in time to improve the efficiency of fault handling [11].…”

“…Therefore, the functions of embedded systems are becoming more and more abundant, and their structural forms are becoming more and more complex. In order to meet the actual needs of embedded system functions, for embedded processors, it is not only necessary to apply 32bit and 64 bit RISC chips to improve their processing capacity, but also to apply programming technology and cross development tools to optimize the system program design scheme, shorten the program development cycle, and improve the quality of program design [11].…”

Design and implementation of art grading line dance scoring system based on Android and SQLite

“…At present, most line dancing competitions use EXCEL for data input, score processing and score distribution manually, which is not only slow, inefficient and error-prone [4], but also inconvenient for data sharing and various related information release of line dancing competitions. With the increase of the number of participants, the amount of the project team increases, especially in the individual events, the competition process is short, there are many people present, and the judges need to quickly and accurately give the correct score, the workload of the judges will be particularly complicated.…”