Patent ID: 7394847

Claim:
A receiver comprising: a receiving unit which receives a signal in which a symbol comprises Walsh codes each comprising a plurality of chips and each generated from a plurality of phase signals; a phase correction unit which corrects a phase of the received signal such that the phase approaches one of phases to which Walsh codes are assigned; a signal transform unit which partitions a phase plane in which a phase-corrected signal is assigned into a plurality of sub-areas in accordance with the phases to which the Walsh codes are assigned, identifies one of the sub-areas that corresponds to the phase-corrected signal, and thereby transforms the phase-corrected signal into a value corresponding to the identified sub-area; a Walsh transform unit which subjects the value corresponding to the identified sub-area to Walsh transform symbol by symbol, so as to generate a plurality of correlations; and a selection unit which selects one correlation from the plurality of correlations thus generated and outputs a plurality of phase signals corresponding to the selected correlation, wherein the signal transform unit defines the number of bits in the value corresponding to the identified sub-area to be smaller than the number of bits in the phase-corrected signal.