... -6436Mbps/24Mbps:QAM-1618Mbps/12Mbps:QPSK9Mbps/6Mbps:BPSK11b: Direct Sequence Spread Spectrum(DSSS)11Mbps/5.5Mbps:CCK2Mbps:DQPSK1Mbps:DBPSkModulation Technique802.11b: Direct ... Sequence Spread Spectrum (PBCC, CCK, DQPSK, DBPSK)802.11g: Orthogonal frequency division multiplexingSecurity ...