1. Wireless Local Area Technology

2.  Garikayi Brasington Madzudzo  Edmund Nartey  Ismeil Ahamed  Jakub Gieryn  Arnaud Fogno

3.  Introduction  Definitions  Specifications & Technologies  Benefits of 802.11n Technology  Security (Authentication & Encryption)

4.  is an amendment to the IEEE 802.11-2007 wireless networking standard to improve network throughput over the two previous standards— 802.11a and 802.11g.  is a protocol developed by the international non- profit Institute of Electrical and Electronics Engineers.  The number "11" indicates the IEEE working group assigned to 802 standards, and the "n" refers to a special task group within this body, known as TGn.  is an industry standard for high-speed Wi-Fi networking

5.  802.11n is designed to replace the 802.11a, 802.11b and 802.11g Wi-Fi standards for local area networking.  Offers greater speed and a larger frequency range.  is intended to improve WLAN data rates and range without requiring additional power or RF band allocation.  802.11n will help with overall mobile connectivity in terms of distance and speed. By being able to have that improved distance and speed capability, 802.11n is going to bring wireless technology closer to actual wire speed and wire-based reliability, which is one of the biggest lacking factors of 802.11b and 802.11g

6.  It utilizes multiple receivers and transmitters, a technology known as MIMO (multiple-input multiple- output).  This allows parallel streams of data transmissions, or spatial multiplexing.  The 802.11n standard also incorporates orthogonal frequency-division multiplexing (OFDM).  OFDM splits signal frequencies up into several modulated channels for increased throughput.

7.  2.4 GHz band: A lot of devices use this, thus more likely to get interference, however better range than the 5 GHz band  5 GHz band: higher frequencies allow using smaller antennas, however they are more easily absorbed by obstacles such as walls.  Caters for both frequencies to allow for backward compatibility.

8.  Implements changes at physical layer (PHY) and MAC layer  PHY: 40MHz channels  MAC: frame aggregation (A-MSDU and A- MPDU)  maximum MAC frame body field size increased (can be 3839 or 7935 octets (A-MSDU size based)

9.  Supports Wi-Fi Protected Access Version 2 (WPA2)  802.11n devices encrypt data in accordance with Advanced Encryption Standard (AES)  AES replaced WPA with TKIP and WEP as more secure method of encrypting wireless data  In 802.11n AES cipher relies on CCMP protocol to provide cryptographic encapsulation (see CTR with CBC-MAC, CCM mode, RFC 3610)

10. 802.11a802.11b802.11g802.11n Standard Approved July 1999 June 2003 September 2009 Maximum Data Rate 54 Mbps11 Mbps54 Mbps200+ Mbps ModulationOFDMDSSS / OFDM DSSS / OFDM RF Band5 GHz2.4 GHz 2.4 GHz or 5 GHz Channel Width20 MHz 20 MHz or 40 MHz The table below shows the different wireless standard and technologies

11.  http://www.broadcom.com/collateral/wp/802_11n-WP100- R.pdf http://www.broadcom.com/collateral/wp/802_11n-WP100- R.pdf  http://standards.ieee.org/about/get/802/802.11.html http://standards.ieee.org/about/get/802/802.11.html  http://www.ieee802.org/11/ http://www.ieee802.org/11/  http://www.webopedia.com/TERM/8/802_11.html http://www.webopedia.com/TERM/8/802_11.html  http://standards.ieee.org/getieee802/download/802.11n- 2009.pdf http://standards.ieee.org/getieee802/download/802.11n- 2009.pdf  http://standards.ieee.org/getieee802/download/802.11-2007.pdf http://standards.ieee.org/getieee802/download/802.11-2007.pdf