802.11n

802.11n is WiFi alliance in 802.11a / B / g behind a wireless transmission protocol, in order to achieve high bandwidth, high quality WLAN services, the wireless local area network to Ethernet performance level, task group 802.11 ( TGn N ) emerge as the times require. The 802.11n standard to 2009 to get IEEE approval, but using the MIMO OFDM technology has many manufacturers, including DLink, Airgo, Bermai, Broadcom and Agere systems, Atheros, Cisco, Intel and so on, products include wireless network card, wireless routers, but also has a large number in the PC, application of notebook computers.

Produce

In today's wireless LAN technology interweave of the Warring States period, WLAN, Bluetooth, HomeRF, UWB, blossom eagerly, but IEEE802.11 series of WLAN is the most widely used. Since 1997 since the implementation of IEEE802.11 standard, 802.11b, 802.11a, has 802.11g, 802.11e, 802.11f, 802.11h, 802.11i, 802.11j and other standards or brewing, but WLAN is still faced with insufficient bandwidth, roaming is not convenient, management is not strong, system security and no killer application. As the application of VoIP in a new field that the VoWLAN, although the industry was seen as WLAN the most promising killer application, but since the four" not", it is difficult to develop further. 600Mbps wonderful prospects, 100Mbps net throughput;

Application

The rate of transmission, 802.11n can be WLAN transmission rate by current 802.11a and 802.11g with 54Mbps, 300Mbps and 600Mbps raised to high. Thanks to the MIMO ( MIMO ) and OFDM ( orthogonal frequency division multiplexing ) technology combined application of MIMO OFDM technology, improve the quality of wireless transmission, the transmission rate is improved greatly.

In terms of coverage, 802.11n using smart antenna technology, through multiple independent antenna consists of antenna array, can dynamically adjust the beam, ensure that WLAN users to receive stable signal, and can reduce the interference from other signals. Therefore the coverage can extend to several square kilometers, making WLAN mobility is greatly improved.

Compatibility, 802.11n uses a software radio technology, it is a fully programmable hardware platform, so that different base station and terminal of the system are available through this platform to realize the intercommunication and the compatibility of different software, which makes WLAN compatibility can be greatly improved. This means that WLAN can not only realize the 802.11n forwards and backwards compatible, but also can realize the combination of WLAN and wireless wide area network, such as 3G.

Two camps

Unfortunately, 802.11n is now a" standard lag, the product of premature " embarrassing position. The 802.11n standard to 2009 to get IEEE approval, but using the MIMO OFDM technology has many manufacturers, including DLink, Airgo, Bermai, Broadcom and Agere systems, Atheros, Cisco, Intel and so on, products include wireless network card, wireless routers, but also has a large number in the PC, application of notebook computers.

The dominant 802.11n standard technical camp two, WWiSE ( World Wide Spectrum Efficiency ) and TGn Sync alliance alliance. The two camps have hope in the next generation wireless LAN standard competition in the priority position, but the two camps of technical framework has been more and more similar, for example, are using MIMO OFDM technology, and in August 2nd the message says, they have decided to forgive and forget, common to the United States Institute of electrical and Electronics Engineers ( IEEE ) submitted the 802.11n Wireless version.

In the first half of 2007 have been identified in 802.11n 2 draft, can fully support the future official standard. And IEEE is expected in the first half of 2008 through formal standards.