Rake receiver

摘要

A RAKE receiver which is employed in a direct sequence spread spectrum communication system, and which can effectively receive multipath signals. A path searcher (12) measures the amplitude of each path, selects N paths with larger amplitudes in descending order of magnitude, where N is the number of despreaders (10), and assigns the despreaders (10(1)-10(N)) to the selected paths to despread the signals of the paths. This assignment of the despreaders (10) to the paths is carried out such that a path with a large amplitude and a path with a small amplitude are assigned to adjacent despreaders and are input to the same pre-detection combiner. The outputs of the despreaders are combined by the pre-detection combiners (14(1)-14(M)), and detected by detectors (16(1)-16(M)) whose outputs are RAKE combined by a post-detection combiner (18). <IMAGE>