802.11 n

802.11 n

Wi - Fi alliance in 802.11 a/b/g a wireless transmission behind, in order to achieve high standard agreement bandwidth, high quality service, so the WLAN wireless local area network to Ethernet performance level, 802.11 task group N (the TGn) came into being. 802.11 n standard until 2009 to get an IEEE formally approved by MIMO OFDM technology, but the firms have many, including D - Link, Bermai, Broadcom Airgo, and Jill system, Atheros, cisco, Intel, etc., products include wireless card, wireless router etc, and has a PC, laptop computers in application.

produce

In today's various wireless LAN technology, interweave the warring states period, bluetooth, HomeRF, wireless local-area network (WLAN UWB blooms, but such scrambling asstandard of WLAN is the most widely used. Since 1997, since the implementation of IEEE802.11 standard has had 802.11 b, 802.11 a, 802.11 g, 802.11 e, 802.11 f, 802.11 h, 802.11 I, 802.11 j, etc, but standards or brewing still face bandwidth shortage, wireless local-area network (WLAN roaming inconvenient, net not strong, system security and no killer application etc. Like today's VoIP application as a whole new field, though VoWLAN by insiders as WLAN most promising killer application, but because the four "no", it is difficult to further development.

600Mbps wonderful prospects, the net throughput 100Mbps;

application

In a transmission rate, 802.11 n can will WLAN transmission rate by at present 802.11 a and 802.11 g 54Mbps, provide to provide 300Mbps even as high as 600Mbps. Thanks to the much more will MIMO (out) and OFDM (orthogonal frequency division multiplexing) technologies combining the MIMO OFDM applications wireless transmission technology, improving the quality, also make the transmission rate gets great ascension.

In coverage, 802.11 n using intelligent antenna technology, through multiple independent composed of antenna array antenna beam, can dynamically adjusting, guaranteed to WLAN user receives stable signal, and can reduce interference from other signals. Therefore its coverage can be expanded to several square kilometers, make the WLAN mobility greatly enhance.

In compatibility, 802.11 n adopted a software radio technology, it is a fully programmable hardware platform, make different systems stations and terminals can all through this platform of different software to realize interchange and compatible, this makes WLAN compatibility gets great improvement. This means that WLAN will not only can realize 802.11 n forward compatibility, and can realize after the wide-area wireless local-area network (WLAN combining with the wireless network, such as 3G.

Two camps

Let a person unfortunately, 802.11 n now in a "standard lag, the products of premature" embarrassing. 802.11 n standard until 2009 to get an IEEE formally approved by MIMO OFDM technology, but the firms have many, including D - Link, Bermai, Broadcom Airgo, and Jill system, Atheros, cisco, Intel, etc., products include wireless card, wireless router etc, and has a PC, laptop computers in application.

Leading 802.11 n standard technology faction has two, namely World Wide WWiSE (such Efficiency) alliance and the TGn Sync alliance. This both factions hope in the next generation of wireless local area network standards for priority, but in the two camps already more and more similar technical structure, such as are using MIMO OFDM technology, and in August 2, sources said they had decided to make it up to the United States, common electrical and electronics engineers (IEEE) institute submitted 802.11 n wireless technology version.

In the first half of 2007 has identified 802.11 n 2.0 draft, can fully support future formal standards. And in the first half of 2008 IEEE expected by formal standards.