Patent ID: 6507605
Filing Date: 2003-01-14
Classification: H04B

Abstract:
A RAKE receiver in a direct sequence CDMA transmission system for carrying out multiple access transmission by spreading a modulation signal of information data into a wideband spread modulation signal using a spreading code, said RAKE receiver comprising:means for receiving the spread modulation signal; a spreading code replica generator for generating spreading code replicas; a matched filter with a plurality of output taps for producing a plurality of despread signals by despreading, using spreading code replicas output from said spreading code replica generator, the spread modulation signal received; an error signal generator for generating an error signal; a weighting factor controller for generating, from the error signal and the plurality of despread signals fed from said matched filter, weighting factors corresponding to the plurality of despread signals, respectively, and for controlling the weighting factors such that the error signal becomes minimum; multipliers for multiplying the despreading signals by the corresponding weighting factors fed from said weighting factor controller; demodulators for demodulating individual outputs from said multipliers; an adder for combining a plurality of demodulated signals fed from said demodulators; and a reference signal generator for generating a reference signal from an output of said adder, wherein said error signal generator generates the error signal by calculating a difference between the output of said adder and the reference signal.