Mobile communication technology is distinguished from electronic technology by one of the functions:

It's messaging.

Communication technology is an important branch of electronic engineering, and it is also one of the basic disciplines.

Whether the receiver can correctly recognize the information depends on the level of loss in the transmission. Signal processing is an important part of communication engineering, including filtering, encoding and decoding. Professional courses include computer network basics, circuit basics, communication system principles, switching technology, wireless technology, computer communication networks, communication electronic circuits, digital electronic technology, optical fiber communication, etc.

In the past 10 years, the world's telecommunications have undergone tremendous changes, and the rapid development of mobile communications, especially cellular cells, has enabled users to completely get rid of the shackles of terminal equipment and achieve complete personal mobility, reliable transmission means and connection methods. In the 21st century, mobile communication will gradually evolve into an indispensable tool for social development and progress.

The second step, the fifth generation of mobile communication technology (referred to as 5G) is the latest generation of cellular mobile communication technology, which is an extension of 4G, 3G and 2G systems. The main advantage of the 5G network is that the data transmission speed is much higher than that of the previous cellular network, up to 10Gbit S, and another advantage is that the air interface latency level is about 1 millisecond, which can meet real-time applications such as autonomous driving and telemedicine.

So, choose option D.

Hello, the main characteristics of mobile communication are as follows: 1. Mobility. It is to keep the object communicating in a moving state, so it must be wireless communication, or a combination of wireless communication and wired communication.

Second, the radio wave propagation conditions are complex. Because the moving body may move in various environments, electromagnetic waves will produce reflection, refraction, diffraction, Doppler effect and other types of baby elephants when propagating, resulting in dry bionic multipath interference, signal propagation delay can be broadened and other effects. 3. Serious noise and interference.

Automobile spark noise, various industrial noises, intermodulation interference, adjacent channel interference, and co-channel interference between mobile users in urban environments. Fourth, the system and network structure are complex. It is a multi-user communication system and grid that must allow the user homes to work in harmony without interfering with each other.

In addition, the mobile communication system should also be interconnected with the local telephone network, satellite communication network, data network, etc., and the structure of the entire network is very complex. 5. Frequency band utilization is required. The frequency resources of electromagnetic waves are extremely limited, and the frequency resources that can be used by various mobile communication systems of different standards are only tens of megahertz, and their utilization rate must be fully improved to ensure the needs of users for large information flows.

Hope it helps.