A method for precoding over a beam subset, the method being performed by a network node capable of exchanging reference signal information for a set of transmission beams and a set of antenna ports, the method comprising: exchanging reference signal information for said set of transmission beams or said set of antenna ports with a wireless device; acquiring, based on said reference signal information, information regarding which proper subset of transmission beams from said set of transmission beams to use for communication with said wireless device; and determining precoding weights for said proper subset of transmission beams based on said reference signal information characterized in that exchanging said reference signal information comprises: transmitting (S102a) a first set of reference signals in said set of transmission beams; receiving (S102b) first feedback information of said first set of reference signals from said wireless device, said first feedback information defining a first part of said reference signal information, and wherein said proper subset of transmission beams is determined from said first part; transmitting (S102c) a second set of reference signals in said proper subset of transmission beams; and receiving (S102d) second feedback information of said second set of reference signals from said wireless device, said second feedback information defining a second part of said reference signal information, and wherein said precoding weights are determined from said second part. exchanging reference signal information for said set of transmission beams or said set of antenna ports with a wireless device; acquiring, based on said reference signal information, information regarding which proper subset of transmission beams from said set of transmission beams to use for communication with said wireless device; and determining precoding weights for said proper subset of transmission beams based on said reference signal information characterized in that exchanging said reference signal information comprises: transmitting (S102a) a first set of reference signals in said set of transmission beams; receiving (S102b) first feedback information of said first set of reference signals from said wireless device, said first feedback information defining a first part of said reference signal information, and wherein said proper subset of transmission beams is determined from said first part; transmitting (S102c) a second set of reference signals in said proper subset of transmission beams; and receiving (S102d) second feedback information of said second set of reference signals from said wireless device, said second feedback information defining a second part of said reference signal information, and wherein said precoding weights are determined from said second part. transmitting (S102a) a first set of reference signals in said set of transmission beams; receiving (S102b) first feedback information of said first set of reference signals from said wireless device, said first feedback information defining a first part of said reference signal information, and wherein said proper subset of transmission beams is determined from said first part; transmitting (S102c) a second set of reference signals in said proper subset of transmission beams; and receiving (S102d) second feedback information of said second set of reference signals from said wireless device, said second feedback information defining a second part of said reference signal information, and wherein said precoding weights are determined from said second part.