1. An adaptive antenna system (AAS) comprising a plurality of antennae for communicating between a base station and a subscriber station, wherein the AAS employs a direct signaling structure configured to use a downlink subframe and an uplink subframe, wherein the base station generates the downlink subframe and the subscriber station generates the uplink subframe, the downlink subframe comprises: a plurality of downlink access subchannels, wherein each downlink access subchannel k D is paired with downlink access subchannel k D +n/2 where n is a total number of downlink subchannels and k D is an index of downlink access subchannels 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 exactly two adaptive modulation and coding (AMC) bins by b D orthogonal frequency-division multiplexing (OFDM) symbols and where b D is less than or equal to the number of symbols in the downlink subframe; P downlink orthogonal frequency-division multiple access (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 D is paired with downlink payload subchannel j D n/2 where n is the total number of downlink subchannels and j D is an 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 downlink payload subchannel is exactly one or exactly two AMC bins by c D OFDM symbols and where c D is less than or equal to the number of symbols in the downlink subframe; and wherein the uplink subframe comprises: a plurality of uplink access subchannels, wherein each uplink access subchannel k U is paired with uplink access subchannel k U +m/2 where m is a total number of uplink subchannels and k U is an index of uplink access subchannels designated for access, wherein each uplink access subchannel contains at least one uplink data burst region and where each uplink access subchannel is exactly one subchannel by b U OFDM symbols and where b U is less than or equal to the number of symbols in the uplink 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 a plurality of uplink payload subchannels, wherein each uplink payload subchannel j U is paired with uplink payload subchannel j U +m/2 where m is the total number of uplink subchannels and j U is an 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 uplink payload subchannel is exactly one or exactly two AMC bins by c U OFDM symbols and where c U is less than or equal to the number of symbols in the uplink subframe.