Patent ID: 8675558

Claim:
A method, comprising: receiving at a base station a Sounding Reference Signal (SRS) having Precoder Matrix Indicator (PMI) reporting disabled; estimating at the base station a channel between the base station and a wireless station for link adaptation of a downlink signal in Transmission Mode 9 (TM9) based on the received SRS; transmitting from the base station to the wireless station the downlink signal in the TM9 based on the estimated channel using a predetermined single antenna port if a value of a number of Channel State Information-Reference Signal (CSI-RS) antenna ports equals one; and transmitting from the base station to the wireless station the downlink signals in the TM9 based on the estimated channel using spatial multiplexing based on a rank-1 precoder determined from a wideband channel covariance matrix R if the number of CSI-RS antenna ports does not equal one or two.