A wireless terminal is capable of receiving a pilot signal from a base station; and determining a precoding matrix as a linear combination of two matrices V1 and V2 based on the received pilot signal. In one implementation, the two matrices V1 and V2 are sub-matrices of a matrix U of a codebook, the linear combination is u:=(V1+αV2)/√{square root over (1+|α|2)} and α is one of a real-valued number and a complex-valued number. The wireless terminal is also capable of transmitting a representation of at least a portion of the precoding matrix to the base station.