1. An AAS direct signaling structure used between a base station and a subscriber station comprising: a downlink subframe, the downlink subframe including: a plurality of downlink access subchannels, wherein each downlink access subchannel k is paired with subchannel k+n/2 where n is the total number of downlink subchannels and k is the index of downlink access subchannel designated for access, wherein each downlink access subchannel contains at least one downlink data burst region and wherein each downlink access subchannel is exactly one or two AMC bins by k OFDM symbols and where k is less than or equal to the number of symbols in the downlink subframe; P downlink OFDMA symbols containing AAS training preambles distributed across all downlink access subchannels that demarcate a AAS downlink zone and are used to adapt stacked carrier spread spectrum adaptive array processing at the subscriber station; and a plurality of downlink payload subchannels, wherein each downlink payload subchannel j is paired with subchannel j+n/2 where n is the total number of downlink subchannels and j is the index of downlink payload subchannels designated for data transport, wherein each downlink payload subchannel contains at least one downlink data burst region; and where each subchannel is exactly one or two AMC bins by k OFDM symbols and where k is less than or equal to the number of symbols in the downlink subframe; and an uplink subframe, the uplink subframe including: a plurality of uplink access subchannels, wherein each uplink access subchannel k is paired with subchannel k+n/2 where n is the total number of uplink subchannels and k is the index of uplink access subchannels designated for access, wherein each uplink access subchannel contains at least one uplink data burst region and where each access subchannel is exactly one subchannel by k OFDM symbols and where k is less than or equal to the number of symbols in the downlink subframe; Q uplink OFDMA symbols containing AAS training preambles distributed across all uplink access subchannels that demarcate an AAS uplink zone and are used to adapt stacked carrier spread spectrum adaptive array processing at the base station; and an plurality of uplink payload subchannels, wherein each uplink payload subchannel j is paired with subchannel j+n/2 where n is the total number of uplink subchannels and j is the index of uplink payload subchannels designated for data transport, wherein each uplink payload subchannel contains at least one uplink data burst region; and where each subchannel region is exactly one or two AMC bins by k OFDM symbols and where k is less than or equal to the number of symbols in the uplink subframe.