A receiver of a mobile station or a base station in radio communications
is formed by a correlation unit for generating a delay profile for
specifying paths by taking correlations by using replica signals for a
received pilot signal, and a path selection unit for comparing a power
level of each path in the delay profile with a threshold determined
according to an index value regarding a communication state, selecting
paths for which a comparison result satisfies a prescribed condition as
valid paths, and outputting a selected delay profile formed by the valid
paths as a channel estimation value.