Patent ID: 6064690
Filing Date: 2000-05-16
Classification: H04B

Abstract:
A spread spectrum communication system comprising:a transmitter comprising a data modulation circuit which modulates data to be transmitted and generates an in-phase component (I-component) and a quadrature component (Q-component) of said data and a spreading circuit which spreads said I- and Q-components by spreading code sequences to produce spread data;a receiver for receiving a multi-path signal of said spread data including a plurality of signals of different phases, said receiver comprising:a quadric detection circuit which divides said plurality of signals into I- and Q-components;a despreading circuit which despreads said I- and Q-components so as to generate despreaded components;a phase correction circuit which corrects the phase of said despreaded components;a rake combiner for combining said components corrected by said phase correction circuit and for outputting a combined signal; anda delay detection circuit which delays detection of said combined signal,said receiver further comprising a provisional judgment portion for determining said phase of one pair of said I- and Q-components, and said phase correction circuit correcting said phase according to said determined phase.