Patent ID: 6888501

Claim:
A radio reception apparatus comprising: a plurality of antenna elements; a fixed directivity creation section that creates a plurality of fixed directivity reception signals by combining outputs of said plurality of antenna elements using a plurality of fixed weight patterns; delay profile creation sections that create a delay profile for each of said plurality of fixed directivity reception signals; an arrival direction estimation section that estimates a direction of arrival of a transmission wave by detecting peaks that appear in said plurality of delay profiles; and an adaptive directivity creation section that creates an adaptive directivity reception signal by calculating an adaptive weight, to be multiplied by a plurality of reception signals obtained by said plurality of antenna elements, based on said estimated direction and combining the reception signals using said calculated adaptive weight, wherein, said adaptive directivity creation section calculates the adaptive weight using a fixed weight, utilized when creating a fixed directivity reception signal corresponding to a delay profile in which a maximum leak was detected, as an initial value weight of an optimization algorithm.