Patent ID: 7333056

Claim:
An adaptive antenna radio communication device comprising: an array antenna made up of a plurality of antenna elements receiving high frequency signals that are transmitted by a multi-carrier; a demultiplexer for demultiplexing one of the high frequency signals received by a respective one of the antenna elements to a plurality of sub-carrier signals; Nd divided band direction estimating units for estimating the direction-of-arrival of a radio wave by dividing the communication band being said multi-carrier transmitted into Nd bands and using ones of the plurality of sub-carrier signals belonging to the respective divided bands, wherein Nd is at least 2 or a positive integer less than a number of sub-carriers used for multi-carrier transmission, a divided band array weight creating unit for creating a weight of a receive array having a directional beam in the direction of estimation by said divided band direction estimating unit for said respective divided bands; a sub-carrier directivity creating unit for creating a directivity by multiplication-combining the receive array weight created in each divided band with the corresponding sub-carrier signal belonging to the divided band; and a demodulating unit for demodulating data by using the output of said sub-carrier directivity creating unit, wherein said divided band direction estimating unit further has a path search unit for calculating a delay profile by calculating a cross correlation between respective input sub-carrier signals using a known pilot signal embedded in the sub-carrier signal and detecting a plurality of path arrival timings from the delay profile, and estimates the direction-of-arrival based on the correlation value of the pilot signal correlation value calculated between the same sub-carrier signals received by different antenna elements in the respective path arrival timing.