Full explanation of wireless access technology

Wireless access technology is currently a mainstream access technology. Many people may not be familiar with wireless access technology. It does not matter. After reading this article, you must have gained a lot, I hope this article will teach you more things. Wireless Access Technology (also called an air interface) is a key issue in wireless communication.

It connects a user terminal to a network node through wireless media to transmit information between the user and the network. Signals transmitted through wireless channels must follow certain protocols, which constitute the main content of wireless access technology. A major difference between wireless access technology and wired access technology is that it can provide users with mobile access services.

Wireless Access Network is an access technology that connects users and exchange centers using radio waves. In the communication network, the wireless access technology system is located as part of the local communication network and an extension, supplement, and temporary emergency system of the local wired communication network.

Wireless Access systems can be divided into the following technical types:
(1) analog frequency modulation technology: It works at below MHz and is implemented through FDMA. Because the carrier bandwidth is less than 25 KHz, the user capacity is small, it can only provide low-speed data communication services such as voice communication and fax, and is suitable for rural areas with few users and low business volume. When the ultra-short frequency is widely used, there are not many frequency resources dedicated to wireless access technology planning in the ultra-short frequency band. Therefore, wireless access technology systems can share the same frequency without interfering with other fixed and mobile radio services.

(2) Direct Digital Spread Spectrum Technology: working at a frequency above MHz, broadband carriers can provide voice communication, high-speed, image communication, and other services, it has a wide range of communications and a large volume of processing traffic, and can meet the basic needs of urban and rural areas.

(3) cordless telephone technology: it can provide services such as voice communication or medium-speed data communication. DECT in Europe, PHS in Japan, and UT Starcom in PHS are flexible in use. It can be used in public network wireless access technology systems, it can also be used for private network wireless access systems. The most suitable private Wireless Access system within a building or within a unit area. It is also suitable for public communication operators to set up small-area wireless access technology systems in exhibition centers with frequent user changes and high business volumes, securities trading venues, and bazaars, or to set up public wireless access systems on Xiaohai Island.

(4) Cellular Communication Technology: using analog cellular mobile communication technology, such as TACS and AMPS, and digital cellular mobile communication technology? Such as GSM, DAMPS, IS-95CDMA and the 3rd-generation wireless transmission technology that is being discussed to form a wireless access technology system, but does not have the roaming function. This type of technology applies to urban areas with high business volumes.

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