Control Channel Design for Many-Antenna MU-MIMO Systems

A method for optimizing wireless communications by a base station (BS), wherein said wireless communication exhibits 2 modes of operation, a no-CSI (open-loop) mode and a CSI (MIMO) mode occurring before the BS has CSI knowledge of supported active users and the CSI (MIMO) mode occurs after time-frequency synchronization and collection of channel state information (CSI), comprising:

• generating a plurality of synchronization sequences;
• transmitting a single synchronization sequences followed by at least one repetition of that synchronization sequence at the beginning of each frame;
• encoding a geographically locally unique identifier to the BS into said synchronization sequences;
• generating a set of beamforming weights allowing for spatial directional transmission of beam patterns within specific regions;
• altering beam patterns by changing beam forming weights applied to each antenna of the BS to modify the amplitude and phase of the signal sent from said BS antenna;
• transmitting, using a plurality of antenna, said beacon sent in a plurality of beam directions associated with said beam forming weights;
• receiving, by user equipment (UE), said geographically locally unique ID of the BS via beacons;
• simultaneously identifying and synchronizing with said BS through beacon decoding;
• transmitting an uplink pilot from the UE;
• estimating channel state information (CSI) associated with the UE based on the received pilot to the BS;
• collecting UE specific CSI information from said uplink pilot;
• establishing a CSI mode (MIMO communication) link between said BS and said user based on known CSI;
• using known CSI information between the many antenna BS and user to calculate the beamweights that maximize signal strength at the intended user and minimize destructive interference of intended users;
• receiving at said BS location information and/or pilots of the user;
• and
• steering beams of data toward said UE based on the received location information and/or pilots.