Radio equipment capable of real time change of antenna directivity and doppler frequency estimating circuit used for the radio equipment

摘要

A radio equipment (1000) separates a signal from a specific terminal among signals from adaptive array antennas (#1 to #4), based on a reception weight vector calculated by a reception weight vector calculator (20). A reception response vector calculator (22) draws out a reception response vector of a propagation path of the signal from the specific terminal. A correlation operation and Doppler frequency estimating circuit (103) calculates a correlation value between reception response vectors of corresponding slots of continuous frames, and estimates a corresponding Doppler frequency based on a correspondence found in advance. A transmission response vector estimator (32) predicts a transmission response vector, by performing an extrapolation process in accordance with the estimated Doppler frequency.