Common FeaturesMultiple-Input/Multiple-Output (MIMO)Channel WidthMAC Efficiency EnhancementsWWiSEMAC EnhancementsChannels and radio modesProtectionAggregation, bursting, and acknowledgmentThe WWiSE MIMO PHYStructure of an operating channelModulation and encodingInterleaverSpace-time block codingModulation ratesMIMO and transmission modesWWiSE PLCPThe SIGNAL-N fieldWWiSE PMDCharacteristics of the WWiSE PHYTGnSyncTGnSync MAC EnhancementsChannels, radio modes, and coexistenceAggregation and burstingProtectionPowersavingTGnSync PHY EnhancementsStructure of a channelBasic MIMO ratesTransmit modesOptional codingOptional short guard intervalTGnSync Physical Transmission (PLCP and PMD)Legacy headerHigh Throughput headerHigh-Throughput training fieldsData, tail, and paddingTGnSync PMDComparison and Conclusions