Multiuser receiver and communication system that performs multicode transmission

A multiuser receiver comprising a plurality of receiving units and capable of assigning an arbitrary number of receiving units to each user, each of the plurality of receiving units including:

• first and second despreaders each for despreading a received signal by a despreading code;
• a propagation path estimator which, when the despreading code used in the first despreader is a code for despreading a pilot signal, determines and outputs a propagation path estimated value based on the pilot signal output from the first despreader;
• and
• a first phase corrector which, based on the propagation path estimated value, corrects the phase of the despread received signal output from the second despreader,
• each of at least some of the plurality of receiving units further including:
• a first selector which selects either the propagation path estimated value determined by the propagation path estimator contained in the same receiving unit or the propagation path estimated value determined by the propagation path estimator contained in another receiving unit, and supplies the selected propagation path estimated value to the first phase corrector;
• and
• a second phase corrector which corrects the phase of the despread received signal output from the first despreader by using the propagation path estimated value supplied from the other receiving unit and selected by the first selector.