Patent ID: 6590532
Filing Date: 2003-07-08
Classification: H01Q,H04B

Abstract:
A radio equipment changing antenna directivity on real time basis and transmitting/receiving signals to/from a plurality of terminals by time division of said signal into a plurality of slots, comprising:a plurality of antennas arranged in a discrete manner; and a transmission circuit and a reception circuit sharing said plurality of antennas for transmitting/receiving signals; wherein said reception circuit includes a reception signal separating circuit for separating a signal from a specific terminal among said plurality of terminals, based on signals from said plurality of antennas, when a reception signal is received, and a reception propagation path estimating circuit estimating a propagation path from said specific terminal based on signals from said plurality of antennas, when said reception signal is received; said transmission circuit includes a transmission propagation path estimating circuit predicting a propagation path when a transmission signal is transmitted, based on a result of estimation by said reception propagation path estimating circuit, and a transmission directivity control circuit updating said antenna directivity when said transmission signal is transmitted, based on the result of estimation by said transmission propagation path estimating circuit; wherein each said slot includes a first data area of a first prescribed size provided in said slot so as to distinguish transmission/reception to/from said specific terminal, and a second data area of a second prescribed size provided in an area succeeding and apart by a prescribed interval from said first data area, in said slot to distinguish transmission/reception to/from said specific terminal; said reception propagation path estimating circuit provides the first estimation value and a second estimation value of said specific terminal based on data in said first and second data areas, respectively; and said transmission propagation path estimating circuit predicts propagation path when said transmission signal is transmitted, by extrapolating said first and second estimation values.