US Patent 7710910 Wireless base station and wireless communication method

A wireless base station that performs data communication using a plurality of sub carriers, and repeatedly generates frame patterns comprising one combination or more of at least two types of frames in which the number of common pilots in each is different, and transmits data for mobile terminals having poor receiving quality in a frame having a large number of common pilots, and transmits data for mobile terminals having good receiving quality in a frame having a small number of common pilots.