Flexible use of wireless access technology

Wireless access technology is commonly used. So I have studied a wide range of flexible Wireless Access Technologies. I would like to share with you here, and hope it will be useful to you, we also hope that you will have a deeper understanding of wireless access technology. The development of wireless technology makes communication more flexible and convenient. In recent years, wireless communication has developed rapidly, and various new wireless access technologies have emerged. To sum up, there are mainly the following technologies.

Mobile Communication Systems: mobile communication systems are from the first generation of analog systems to the second generation of digital systems. The third generation of mobile communication systems based on CDMA technology will soon be commercially available, the fourth generation mobile communication system is currently being tested.

Wireless Local Loop System: wired fixed telephone users use wireless access technology. Public telephone networks are called wireless local loop systems. This method is economical and realistic. It not only reduces the maintenance cost, shortens the construction cycle, but also facilitates the expansion of equipment, which is especially suitable for remote areas away from cities. The GSM standard, CDMA, FDMA, and TDMA technologies are also applied in wireless local loops. The wireless local loop is mainly used for access by fixed wireless users. Therefore, the frequency of the local loop is different from that of the public mobile communication network, which is mainly distributed between GHz and GHz ~ GHz. A single-point multiplexing microwave communication device is actually a typical wireless local loop device. It generally adopts the TDMA time division multiplexing method, and the central station is connected to the public telephone network through the user, the fixed telephone service is provided through an omnidirectional antenna to communicate with peripheral sites.

Cordless Telephone System: it is an extension of Wired fixed telephone terminals. The cordless telephone system features flexibility and convenience. This type of fixed wireless terminal can contain several wireless sub-machines at the same time. In addition to talking with the master machine, sub-machines can also communicate with each other. The operating frequency of a class is generally 45 MHz, and the antenna covers about 100 meters. The operating frequency of a standard cordless telephone system, such as DECT and PHS, is MHz to MHz ~ Between GHz.

Mobile satellite access system: mobile communication network through synchronous satellites is an ideal wireless access technology that can truly implement Mobile Communication anytime, anywhere and anyone. Such systems usually require satellites to run in low orbit, and require a large number of satellites, with a great investment. The most important feature of a satellite access system is the multi-access transmission mode of satellite communication. It provides large-scale, large-scale, long-distance roaming and mobile and flexible mobile communication services for global users. It is an extension and extension of the land mobile communication system, it is more advantageous in remote areas, mountainous areas, islands, affected areas, oceanic vessels, and long-distance flights.

Wireless LAN: WirelessLAN (WLAN) is a combination of computer networks and wireless communication technologies. It is not bound by cables and can be moved. It can solve problems caused by difficulties in wired network cabling and has the advantages of flexible networking, convenient resizing, compatibility with various network standards, and wide application. WLAN can not only meet the network access requirements of various hosts, but also provide remote wireless access technology, text and fax, email, and other functions.

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