Wireless communication system, radio base station apparatus and radio terminal apparatus

摘要

A wireless communication system comprises mobile stations, and base stations each of which receives downlink communication quality information fed back from the mobile stations, and transmits data to the mobile stations with reference to the fed-back downlink communication quality, wherein the base stations generate an estimation pilot signal for estimating downlink communication quality, generate a detection pilot signal that a mobile station uses for processing the transmission data, and transmit the estimation pilot signal and the detection pilot signal after multiplexing the signals. The base stations transmit the estimation pilot signals for a time period which is sufficiently longer than a difference in propagation delay times of transmission signals transmitted to a mobile station from base stations located adjacent to each other among the plurality of base stations.