METHOD AND APPARATUS FOR CLOSED-LOOP TRANSFORMED CODEBOOK BASED ANTENNA BEAMFORMING

摘要

A wireless communications network including a plurality of base stations is provided. Each one of the base stations wirelessly communicates with a plurality of subscriber stations. At least one of the plurality of base stations includes a receiver configured to receive a precoding vector index (PVI) from a subscriber station. The least one of the plurality of base stations also includes a controller configured to update a transmit covariance matrix using the precoding vector index, and transform a codebook using the updated transmit covariance matrix. The least one of the plurality of base stations further includes a transmitter configured to perform transmit beamforming to the subscriber station using the transformed codebook.