无线上网原理（Principles of wireless internet access）.docVIP

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无线上网原理（Principles of wireless internet access）.doc

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无线上网原理（Principles of wireless internet access）

无线上网原理（Principles of wireless internet access） Wireless networks are divided into two configurations: point-to-point and master-slave. Point to point configuration is used to connect PC or portable computers, allowing the computer to move within the coverage of the wireless network and automatically establish point-to-point connections and transmit data directly between different systems. In the master-slave configuration, all wireless nodes are connected with the access node, and the access node takes the management of wireless communication and the connection with the wired network. Using master-slave configuration, wireless users do not need to consume electricity for finding other nodes when they work within the coverage area of the nodes. Therefore, saving resources is the most ideal way to work with low power consumption. Wireless network transmission technology is mainly divided into radio frequency technology and infrared technology two kinds. Among them, infrared technology is only suitable for short-range wireless transmission (usually less than one meter), and radio frequency technology has a wide range of coverage, and it is a more common wireless transmission technology. Agreement 802.11 standard Wireless LAN products appear on the market for about 990 years. In 1997, the IEEE 802.11 wireless LAN standard was a milestone in the development of wireless networking technology. At present, there are many standards of wireless LAN, the most important one is IEEE 802.11 standard. The IEEE 802.11 standard specifies the standards for two types of wireless LAN types, point-to-point access and master slave structure, and defines wireless specifications such as 2.4GHz frequency hopping, 2.4GHz direct sequence and infrared ray respectively. The wireless LAN protocol announced by IEEE specifies three standards in the physical layer protocol: frequency hopping spread spectrum (FHSS), direct sequence spread spectrum (DSSS) and infrared, and the three physical layer pr