There is provided a wireless base station that stores information on a plurality of different first precodings and information on a plurality of different reception weights; transmits, from antennas, a plurality of downlink reference signals, each of which is obtained by applying one of the first precodings; receives information on reception quality of the downlink reference signals from wireless terminals; selects at least one from the wireless terminals based on the information on reception quality; determines wireless resource allocation for allowing the selected wireless terminal to transmit an uplink reference signal; notifies the selected wireless terminal of the wireless resource allocation; and receives the uplink reference signal transmitted from the selected wireless terminal by applying each of the reception weights to the uplink reference signal.