Path search circuit, radio receiver and radio transmitter, utilizing a directional beam

摘要

A path search circuit according to the present invention has an orthogonal multi-beam forming section 4 for directional reception with a plurality of orthogonal multi-beams orthogonal one to another, correlation-operating sections 61-6 M for correlation-operating outputs of the orthogonal multi-beam forming section 4 with a known signal, weight multiplying sections 81-8 Nb for multiplying the output of the correlation-operating section 61-6 M by a weight converted into a beam space, delay profile generating sections 91-9 Nb for generating delay profiles from the output signals of the weight multiplying sections 81-8 Nb, and a path detecting section 10 for detecting a reception timing and arrival direction of arrival path from the delay profile. This path search circuit can enhance the accuracy of path direction detection by the use of a directional reception signal, and further reduce the direction dependence of path timing detection accuracy.