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802.11n

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Wireless transmission standard protocol
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This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.
802.11n is a wireless transmission standard protocol. The industrial standard is IEEE802.11, which was released on May 12, 2009.
Chinese name
IEEE 802.11n-2009
Foreign name
IEEE 802.11n-2009
Properties
Wireless transmission standard agreement
Industrial standards
IEEE802.11
Application industry
Information and signal communication
Release time
May 12, 2009

catalog

  1. one brief introduction
  2. two Technical characteristics
  3. three limit

brief introduction

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IEEE 802.11n-2009 , for IEEE 802.11-2007 Wireless LAN Revised specifications of the standard. It aims to improve two previous wireless network standards, including 802.11a And 802.11g , lack of online traffic. The theoretical value of its maximum transmission speed is 600Mbit/s, which is greatly improved compared with the previous 54Mbit/s, and the transmission distance will also increase. January 2004 IEEE Announce to form a new unit to develop new 802.11 standard , officially approved in September 2009.

Technical characteristics

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  • 802.11n adds MIMO Standard, using multiple emitters and receiving antenna To allow higher data transmission rate, and uses Alamouti's Space-time block code To increase the transmission range.
  • 802.11n supports rates in standard bandwidth (20MHz), including 7.2, 14.4, 21.7, 28.9, 43.3, 57.8, 65, 72.2 (short protection interval, single data stream) (in Mbit/s). The maximum speed when using 4xMIMO is 300Mbit/s.
  • 802.11n also supports double bandwidth (40MHz). When 40MHz bandwidth and 4 * MIMO are used, the speed can be up to 600Mbit/s.

limit

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20MHz or 40MHz can be freely selected for 2.4GHz and 5GHz bandwidth , but some devices Equipped network card Only 40MHz bandwidth is allowed at 5GHz, such as MacBook 。 If a user buys a 150Mbps router that only supports 2.4GHz, it can only achieve 72Mbps, which is the fastest speed under 20MHz bandwidth. [1]
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