Patent ID: 7369832

Claim:
A receiving diversity apparatus of a mobile station in a high data rate (HDR) method mobile communication system comprising: a first amplifier for switching a received signal of a first antenna according to a first gain control signal; a second amplifier for switching a received signal of a second antenna according to a second gain control signal; a first phase shifter for shifting phase of an output signal of the first amplifier according to a first phase control signal; a second phase shifter for shifting phase of an output signal of the second amplifier according to a second phase control signal; a combiner for combining output signals of the first and second phase shifters; and a received signal processing circuit for measuring signal quality of a pilot channel from the output signal of the combiner and for controlling a diversity receiving status according to the measured signal quality of the pilot channel, wherein the received signal processing circuit selects a first diversity operation when the measured signal quality of the pilot channel falls within a first predetermined range and selects a second diversity operation different from the first diversity operation when the measured signal quality of the pilot channel falls within a second predetermined range, wherein the received signal processing circuit decides a time for maintaining the selected optimal diversity operation according to a changed amount of the measured signal quality, and wherein the received signal processing circuit comprises: a baseband signal processing circuit for converting and despreading the output signal of the combiner into a baseband signal; a pilot channel C/I measuring circuit for measuring C/I values of pilot channels on the respective antennas outputted from the baseband signal processing circuit and sensing changing status of a presendy received pilot channel; and a diversity control circuit for selecting the first diversity receiving operation or the second diversity receiving operation according to the measured signal quality and deciding the maintaining time of the selected diversity receiving operation according to the changing status of the pilot channel.