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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. 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...
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