
{"publication_number": "US-2003043893-A1", "abstract": "a signal received by a base station is fed to a set of filters matched to spreading codes allocated to pilot channels originating from radio terminals . the outputs from the matched filters are processed so as to estimate parameters comprising , for each channel , eigenvectors representing propagation paths associated with respective amplitudes of reception along these paths . the processing of the output signals from the matched filters comprises an estimation of parameters for a first channel received with a fairly high power by the base station , a correction of the output from the matched filter of a second channel having less energy , taking account of at least one of the eigenvectors of the first channel , and an estimation of parameters for this second channel on the basis of the modified output from said matched filter .", "application_number": "US-16412902-A", "description": "the invention is described below within the framework of a spread spectrum radio communication system using a code - division multiple access technique ( cdma ) of which umts is an example . a channel of such a system on a carrier frequency is defined by a spreading code composed of discrete samples called \u201c chips \u201d, having real values (\u00b1 1 ) or complex values (\u00b1 1 \u00b1 j )/{ square root 