System and method for determining use of STTD encoding of base system

A method in an asynchronous mobile communications system for determining use of space-time block-coding-based transmit diversity encoding in a base station comprising:

• (a) detecting scrambling codes through a common pilot channel transmitted from the base station which includes two transmission antennas;
• (b) generating pilot symbols using the detected scrambling codes;
• (c) performing depatternization of the generated pilot symbols using pilot symbol patterns corresponding to each of the two transmission antennas;
• (d) performing accumulation and addition processes of the two pilot symbols having undergone depatternization, and outputting the symbols as signals corresponding to each of the two transmission antennas;
• and
• (e) comparing energy values of the two output signals corresponding to the transmission antennas to determine if space-time block-coding-based transmit diversity encoding of the base station is being used.

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 accumulation processor using pilot symbol patterns corresponding to the two transmission antennas of the base station;
• two or more accumulator bank units for performing accumulation and addition processes of the signals that have undergone depatternization by the depatternization unit to output signals corresponding to the two transmission antennas, depatternization lengths of each of the two or more accumulator bank units being different;
• and
• a final determining unit receiving the signals corresponding to the two transmission antennas and output by the two or more accumulator bank units in order to perform a final determination of whether space-time block-coding-based transmit diversity encoding of the base station is being used.

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 the accumulator bank unit comprises:
• a first accumulator for accumulating each signal, which has undergone depatternization by the depatternization unit, at every predetermined number of symbols, the predetermined number corresponding to a predetermined depatternization length;
• a non-coherent adding unit receiving input of each signal accumulated by the first accumulator, and adding and outputting signals having in-phase and quadrature-phase elements;
• and
• a second accumulator receiving each of the signals output by the non-coherent adding unit, accumulating the signals by as much as a predetermined accumulation length, and outputting the signals as signals corresponding to each of the two transmission antennas.