Patent ID: 7095727

Claim:
A system in an asynchronous mobile communications system and located in a mobile station for determining use of space-time block-coding-based transmit diversity encoding in a base station that includes two transmission antennas, the system comprising: a cell search unit for detecting frame timing information and scrambling codes of the base station from signals output from the base station; a descrambling unit for descrambling the signals output from the base station using the frame timing information and the scrambling codes, which are detected by the cell search unit; an accumulation processor for despreading the signals descrambled by the descrambling unit; a depatternization unit for performing depatternization of the signals despread by the logic processor using pilot symbol patterns corresponding to the two transmission antennas of the base station; and an accumulator bank unit for performing accumulation and addition processes of the signals that have undergone depatternization by the depatternization unit to output signals corresponding to the transmission antennas; wherein energy values of the signals corresponding to the two transmission antennas and output from the accumulator bank unit are compared to determine if space-time block-coding-based transmit diversity encoding of the base station is being used.