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A method of synchronizing an Orthogonal Frequency Division Multiplexed (OFDM) IEEE 802.11a data packet at a receiver is disclosed. The 802.11a data packet has a series of short training sequence (STS) symbols as a preamble. Cross-correlation at the receiver of the STS in the 802.11a packet PLCP preamble with the modified reference STS, that is 10 ( Read more... )

 
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 CSMA was initially developed for wired LANs, wherein sensing the channel state is, relatively
speaking, straight-forward. The shared wired medium or bus suffers from low levels of thermal
noise with little signal attenuation, implying that any transmission from a single node could be
reliably detected by all other nodes, i.e. all nodes are ( Read more... )

 
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 Because 802.11 management and control frames are neither authenticated nor encrypted, being able to send custom 802.11 frames gives a wireless attacker an unlimited opportunity to cause Layer 2 DoS attacks on a targeted WLAN. Even worse, a skilled attacker can spoof his or her attacking machine as an access point, wireless bridge, or client host ( Read more... )