Main features and key technologies of 4G mobile communication systems (1)

1. Introduction

With the increasing demand for mobile communication systems, currently, 2G, 2G, and 2G systems and 3G systems that have been put into commercial use cannot meet the increasing high-speed multimedia data business needs of modern mobile communication systems, many countries have invested in the research and development of 4G mobile communication systems. This article will briefly introduce the main technical features of 4G mobile communication systems, and discuss the key technologies that may be used in 4G systems.

2. Main Features of 4G Mobile Communication Systems

Compared with 3G, the technology of 4G mobile communication systems has many advantages, including:

(1) high speed. For large-range high-speed mobile users (250 km/h), the data rate is 2 Mb/s; for medium-speed mobile users (60 km/h), the data rate is 20 Mb/s; for low-speed mobile users (indoor or walking), the data rate is 100 Mb/s.

(2) It focuses on digital broadband technology. In the 4G mobile communication system, the signal is mainly transmitted in Millimeter waves, and the cellular area will be much smaller, greatly increasing the user capacity, but it will also cause a series of technical difficulties.

(3) good compatibility. The 4G mobile communication system implements globally unified standards, so that all users of mobile communication operators can enjoy the same 4G service and truly implement the communication of a mobile phone anywhere in the world.

(4) strong flexibility. 4G mobile communication systems use smart technologies to allow them to allocate resources elastically and handle ever-changing business flows in the communication process to meet communication requirements, intelligent signal processing technology is used to send and receive signals in various complex environments with different channel conditions. It is highly intelligent, adaptive, and flexible.

(5) coexistence of multiple types of users. The 4G mobile communication system can perform adaptive processing based on dynamic networks and changing channel conditions, so that low-speed and high-speed users and a variety of user devices can coexist and communicate with each other, this satisfies the needs of multiple types of users in the system.

(6) integration of multiple businesses. The 4G mobile communication system supports a wider range of mobile services, including high-definition image services, conference and television services, and virtual reality services, allowing users to access any required information services anywhere. It integrates personal communication, information systems, broadcast and entertainment industries into a whole to provide users with a wider range of services and applications more securely and conveniently.

(7) advanced technology applications. The 4G mobile communication system is based on several breakthrough technologies, such: OFDM multi-access method, Smart Antenna and space-time encoding technology, wireless link enhancement technology, software radio technology, efficient modulation and demodulation technology, high-performance transceiver and multi-user detection technology.

(8) Highly self-organized and adaptive networks. The 4G mobile communication system is a fully autonomous and adaptive network with self-management capabilities on the structure to meet the changing needs of users in terms of business and capacity.