RADIO EQUIPMENT CAPABLE OF REAL TIME CHANGE OF ANTENNA DIRECTIVITY AND DOPPLER FREQUENCY ESTIMATING CIRCUIT USED FOR THE SAME

摘要

PURPOSE: A radio equipment capable of the real time change of antenna directivity and a Doppler frequency estimating circuit used for the same are provided to accurately estimate a transmission response vector of a downstream circuit when generating an estimation error of a reception response vector estimated in an upstream circuit and perform an excellent transmission directivity control. CONSTITUTION: A radio equipment(1000) separates a signal from a specific terminal among signals from adaptive array antennas(#1-#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 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.