Fall16-Notes-Lecture-6 - More 802.11 Wireless LANs IEEE 802.11n can go to as high as 150 Mbps and up to 70 meters(indoors and 250 meters(outdoors There

Fall16-Notes-Lecture-6 - More 802.11 Wireless LANs IEEE...

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More 802.11 Wireless LANsIEEE 802.11n can go to as high as 150 Mbps and up to 70 meters (indoors) and 250 meters(outdoors). There are major changes to achieve the higher rates: The higher bit rates are achievedby using MIMO (Multiple-inputs and multiple-outputs) antennas along with specialized bitcoding schemes. This allows multiple streams of data to be transmitted and received amongdevices. Also multiple packets are combined. For faster speed (data rate), 40 MHz channels areutilized. Either of 5.8 GHz and 2.4 GHz bands can be used. Also, there is backward compatibilitywith 802.11g.IEEE 802.11ac is designed for 5.8 GHz band and is expected to reach to 1 Gbps total and/orabout 500 Mbps per user. This is achieved by employing 80 MHz channels (required) and 160MHz channels (optional). Up to 8 MIMO spatial streams, multi-user MIMO (where multipleusers are transmitting and receiving simultaneously), and a very unusual coding of bits isemployed before transmission over the air. The standard got approved in January 2014 and

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