MIMO air interface utilizing dirty paper coding

A method of improving communication over an air interface comprising:

• in a wireless transmit/receive unit having a transceiver:
• providing user data streams to a medium access channel (MAC) module and channel state information to a smart antenna processor;
• generating security data, said security data including security tokens and keys;
• providing security policy data;
• determining data transmission rates for the data streams and security data;
• allocating said data streams and security data to transmission channels for transmission;
• encoding the security data onto the user data streams using a dirty-paper-coding (DPC) technique;
• generating and providing the pre-coding coefficients for use in the DPC technique;
• and
• transmitting the security encoded data streams utilizing a plurality of antennas;
• utilizing the channel state information and the security policy data to provide beam-steering, pre-egualization, and eigen-beam-steering functionality to the transceiver;
• receiving pilot signals on the plurality of antennas;
• processing the received pilot signals;
• determining channel estimates based on the received pilot signals;
• calculating filter coefficients based on the determined channel estimates;
• providing said filter coefficients to a plurality of pre-distortion antenna modules and to an eigen-decompose module;
• in the eigen-decompose module, decomposing a single-antenna receiver's channel and providing orthogonal sub-channels to a beam identification module;
• in the beam identification module, combining the plurality of orthogonal sub-channels into a plurality of transmission channels;
• providing the transmission channels to the MAC module wherein data transmission rates are determined and wherein data streams and security data are allocated to transmission channels for transmission;
• encoding security data onto data streams allocated for transmission utilizing a plurality of DPC coders, wherein one DPC coder encodes data for transmission on a particular transmission channel;
• processing encoded data streams received from a particular DPC coder with a particular one of the plurality of pre-distortion antenna modules, wherein said processing includes scaling the received data streams using the filter coefficients;
• and
• transmitting the scaled and encoded user data streams utilizing the plurality of antennas;
• performing a pre-distortion function in the plurality of pre-distortion antenna modules by utilizing the filter coefficients zero-forcing and minimum mean-squared error (MMSE) equalizers across space, time and frequency domains;
• providing ISI information to the pre-distortion antenna modules.