| The appearance of wireless technology realizes the mankind's ultimate dream of communication, gets rid of the constraint of the time and space to make communication at anytime and anywhere possible. Many telecommunication technologies have appeared as the development of wireless communication technology from analogy to digital, telecom servi ce from voice to data communication. Wireless-LAN has got unprecedented development over the past two years, with the performance improving constantly, the range of application expanding constantly, and the price reducing gradually. The Wireless-LAN industry chain is strengthening constantly, having the enormous business opportunity, from personal users, to enterprise users to the telecommunication operators.According to thenecessarity of China Telcecom and Anhui Telecom'S WLAN plan,this article study the item.This article introduces the key technology that WLAN adopts, the main content of IEEE 802.11 and the range of application and some cases. The standard speed of this series is 802.11 of 1- 2Mbps, 802.11b of 11Mbps, 802.11a of 54Mbps, 802.11g of 22Mbps, and 802.11n of 108Mbps,etc. This article introduces OFDM'S digital modulation technique of WLAN ,including OFDM'S fundamental principle, modulation technique and system realization. This article also introduces normal standard physics layer, data chain layer, security and etc.This article analyses the advantages and disadvantages of the different technology such as Bluetooth, GPRS, CDMA1X, 3G, etc, and it's object markets, and put out the Wireless-LAN 's application place at present.According to practical situation of Anhui Province and now all telecom running enterprises, the article gives us the necessity of Anhui Telecom WLAN'S item. According to the analysis of authentication technique(PPPOE, WEB+PORTAL,802.1X), the article Anhui Telecom the building network of WLAN.Using the method of one linearity regression and according to the change of... |
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