Bluetooth Wireless Lan

The new 802.11n wireless technology standard introduced - wireless, 802.11n, wireless LAN - Network Communication industry HC

802.11n context   Various wireless LAN technologies in today's cutting the Warring States Period, WLAN, Bluetooth , HomeRF, UWB and other competing bloom, but the IEEE802.11 family of WLAN is the most widely used. Since 1997, IEEE802.11 standard has been implemented, there have 802.11b, 802.11a, 802.11g, 802.11e, 802.11f, 802.11h, 802.11i, 802.11j other standards or brewing, but WLAN is still facing "four noes One does not "question, namely, insufficient bandwidth, roaming inconvenient, network management is not strong, the system safe and no killer applications. Like today's VoIP application as a new area of VoWLAN, although the industry as a WLAN is the most promising killer application, but because of the four "no", it is difficult to further develop.

Order to achieve high bandwidth, high quality WLAN service to the wireless LAN to Ethernet performance levels, 802.11n emerged.

500Mbps wonderful prospects In transfer rate, 802.11n WLAN transmission rate can be from the current 54Mbps 802.11a and 802.11g provides up to 108Mbps, and even as high as 500Mbps. Thanks to the MIMO (Multiple Input Multiple Output) and OF DM (Orthogonal frequency division multiplexing) technology combines the application of MIMOOFDM technology, this technology not only improves the quality of wireless transmission, but also to greatly enhance the transfer rate.

Prospects: 802.11n WLAN transmission rate would reach the current transmission rate of 10 times, and can support high-quality voice, video transmission, which means that people can Offices Used Wi-Fi Mobile To make IP telephony and video telephony.

In the coverage area, 802.11n uses smart antenna technology, through multiple independent antenna of the antenna array can dynamically adjust the beam to ensure that WLAN users to receive a stable signal, and can reduce the interference of other signals . Therefore, its coverage can be extended to several square kilometers, making WLAN Mobile Of greatly enhanced.

Prospects: This makes use Notebook Computer , And PDA can be a greater range of movement, allowing WLAN signal coverage to the office, hotel and family anywhere, let us truly experience the mobile office and mobile life of convenience and pleasure.

In compatibility, 802.11n uses a software radio technology, it is a fully programmable hardware platform, making the base stations of different systems and terminals are available through the platform to achieve interoperability of different software and compatible, which makes WLAN compatibility have been greatly improved. This means that not only can achieve 802.11n WLAN will later forward compatible, but also realize the WLAN and wireless wide area network integration, such as 3G.

Standard two camps in the war

Pity is, 802.11n is in a "standard lag, product premature" embarrassing situations. 802.11n IEEE standard has not been a formal approval, but manufacturers have been using MIMOOFDM technology many Package Include Airgo, Bermai, Broadcom and Agere Systems, Atheros, Cisco , Intel And so on, products include wireless LAN, Wireless Router And so on, and has large number of PC , Notebook computer applications.

Leading technical camp 802.11n standard has two, namely WWiSE (World Wide SpectrumEfficiency) Union and TGnSync Union. Both camps hope the next generation wireless LAN standard is a priority dispute, but the two camps has become increasingly similar to the technical architecture, for example, are based on the MIMOOFDM technology, but also in the Aug. 2 news that they have decided to let go, common to the American Institute of Electrical and Electronics Engineers (IEEE) 802.11n wireless technology submitted version.

In this fierce Competition , We do not see China's shadow, so we have to feel some regret. This is the core technology we do not have consequences. Standards war is ultimately a dispute over interests of Chinese enterprises in the WLAN core technology is difficult to achieve significant benefits, it is worth pondering.

Editorial 802.11n WLAN certainly able to bring real killer application, think about Office We can no longer use the phone, not using a desktop phone, but the use of Wi-Fi phone, you can make notebook computers without interrupting the network connection in each office, meeting room mobile office. In the family, and we can enjoy a variety of broadband wireless applications, from IPTV To the videophone can be achieved through the WLAN, more importantly, a variety of smart home appliances can be achieved through the WLAN connection can be connected with the communication system to achieve more intelligent control.

802.11n lighthouse as fog, has been getting closer and closer to us.

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