Patent ID: 7650153

Claim:
A system for transmission diversity status detection, which receives a synchronization channel (SCH) signal and a common pilot channel (CPICH) signal from a base station for detecting whether the base station uses first and second antennas for transmission diversity, the system, comprising: a mobile station antenna for receiving signals from the base station, the signals being down converted into baseband signals, the baseband signals being despreaded to obtain SCH symbols and CPICH symbols; a phase reference extractor for extracting first and second phase reference signals from the baseband signal; and a transmission diversity status detector for receiving the SCH symbols to detect the transmission diversity status of the base station by detecting the modulation of SCH symbols coherently, the transmission diversity status detector having: a slot switch for passing the SCH symbols in even numbered slots or in odd numbered slots; a channel effect compensator for removing propagation channel effects that the SCH symbols suffer from; an accumulator bank for accumulating the SCH symbols in different slots to increase signal-to-noise ratio of the SCH symbols; and a decision device for detecting the transmission diversity status based on outputs of the accumulator bank.