Radio base station and channel estimation method

Abstract

A radio base station including: a processor configured to precode a first reference signal based on a first precoding matrix and a second reference signal based on a second precoding matrix, transmit the precoded first reference signal using a first radio resource and the precoded second reference signal using a second radio resource, to a radio terminal, receive first channel state information and second channel state information from the radio terminal, the first channel state information indicating a first channel estimated at the radio terminal based on the precoded first reference signal, the second channel state information indicating a second channel estimated at the radio terminal based on the precoded second reference signal, and estimate a downlink channel between the radio base station and the radio terminal based on the first channel state information, the second channel state information, the first precoding matrix, and the second precoding matrix.

Dependencies are inferred from the claim text.