Patent ID: 6931244
Filing Date: 2005-08-16
Classification: H04B

Abstract:
1. A radio equipment changing antenna directivity on real time basis and transmitting/receiving signals time divisionally to/from a plurality of terminals, 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 unit for separating a signal from a specific terminal among said plurality of terminals, based on signals from said plurality of antennas, when a reception signals is received, and a reception transmission path estimating unit estimating a reception response vector of 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 transmission propagation path estimating unit estimating a transmission response vector of a transmission path when a transmission signal is transmitted, based on a result of estimation by said reception propagation path estimating unit, and a transmission directivity control unit updating said antenna directivity when said transmission signal is transmitted, based on a result of estimation by said transmission propagation path estimating unit; and said transmission propagation path estimating unit includes an extrapolation processing unit calculating said transmission response vector of a down link slot to said specific terminal, by an extrapolation process based on a plurality of said reception response vectors of up link slots from said specific terminal estimated by said reception propagation path estimating unit, a memory holding a plurality of parameters used for said extrapolation process, determined in advance in accordance with the propagation environment of said propagation path, and a selecting unit estimating the propagation environment of said propagation path, selecting a parameter corresponding to said estimated propagation environment among said held plurality of parameters, and applying the selected parameter to extrapolation process by said extrapolation processing unit.