Patent ID: 7315733

Claim:
A diversity receiver that is provided with antennas of two systems and an antenna switch for switching between said antennas of two systems; said diversity receiver comprising: an A/D converter for converting a signal that is received by an antenna that has been selected by said antenna switch to a digital signal; a despreader for despreading the digital signal from said A/D converter; a demodulator for demodulating the signal that has undergone despreading by said despreader to realize demodulation of individual channels and a common pilot channel; a reception level measurement unit for measuring the reception level of the common pilot channel based on the common pilot channel symbols that have undergone demodulation by said demodulator; a TFCI bit extractor for extracting TFCI bits from individual channel symbols that have undergone demodulation by said demodulator; a TFCI bit decoding/determination unit for decoding TFCI bits that have been extracted by said TFCI bit extractor, and based on the decoded TFCI bits, determining the presence or absence of communication control data; and an antenna switching control unit for: checking for the presence or absence of communication control data for each fixed time interval based on the determination results of said TFCI bit decoding/determination unit, measuring the reception level of the common pilot channel at the other antenna that differs from the antenna that is currently receiving by controlling the antenna switch during intervals in which communication control data are not present to check the results of measurement of the reception level of said reception level measurement unit; and selecting the antenna in which the reception level is higher.