Reference signaling scheme using compressed feedforward codebooks for MU-MIMO systems

摘要: A multi-user MIMO downlink beamforming system with limited feed forward ( 200 ) is provided to enable preceding matrix information be efficiently a subset of user equipment devices 201. i ), where zero-forcing transmit beamformers (w are computed at the base station 210 and assembled into precoding (W). The encoded using compact reference signal codebook 225, 207. for link signaling, either by sending bits indicating index transmission used, or transmitting one more precoded pilots signals wherein pilot vectors uniquely representative used which includes candidate matrices meet predetermined condition number requirement, such as threshold. 227 extracted MMSE receiver 209. generate receive (v ).