Ieee Wireless Protocols – 802.11’S Evolution

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Issue:

Technology

 

Written by:

Josefina E

 

Date added:

June 9, 2014

 

Level:

University

 

Grade:

A

 

No of pages / words:

3 / 683

 

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5392 times

 

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Essay content:

802.11b uses an offshoot of the same modulation technique as the older Legacy protocol, known as complementary code keying (CCK) (based on direct-sequence spread spectrum used in Legacy). Both protocols also use CSMA/CA for multiple access, which is the reason both Legacy and 802.11b protocols were much slower than any of the other versions we’ve seen – CSMA/CA carries a lot of overhead meaning much wasted bandwidth...
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With 802.11a, we see much faster speeds (54Mbits/sec versus 11Mbits/sec with 802.11b) thanks mostly to orthogonal frequency-division multiplexing (OFDM) and its use of the 5MHz bandwidth spectrum which is much less crowded than the 2.4GHz spectrum used by 802.11a and Legacy protocols. Despite these distinct advantages, 802...
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