HIGH SPEED CELL SEARCHING SYSTEM FOR CDMA

PROBLEM TO BE SOLVED: To enable cell search at a high speed by making data obtained by forming an orthogonal code through the use of a polarity of plural symbols spread by a spreading signal as a down signal and performing common-mode addition by means of a correlation device with the combination of polarities codes extending the plural symbols at the time of detecting. SOLUTION: A correlating part 21 is provided with a short code generating circuit and outputs a correlated value obtained by the correlating device 29 to a ring buffer for common-mode addition by RAM. The buffer 23 common- mode-adds the combination of the polarities the orthogonal code can make by an orthogonal code polarity control circuit inside a maximum value detecting circuit 22. The common-mode-added value of a group I and a group Q obtained as the result is transformed to power by a square sub circuit 24 to be added to the circuit 22 and a chip counter and a symbol counter houses a chip position and a symbol position with maximum values and the polarity of the orthogonal code at the time in a maximum value register and outputs residual values to a long code identifier 25.