Radio receiver and method for identifying spreading codes

The present invention relates to a radio receiver and a method for identifying spreading codes. The present invention particularly relates to a radio receiver and a method for identifying spreading codes in movable body radio communication employing the Code Division Multiple Access (hereinafter referred to as "CDMA") system. A grouping setting section controls spreading code generation sections to input a plurality of long codes into an adder one by one, and thereby the plural long codes are grouped. The adder adds the input plural long codes to each other at every chip in each group, and a correlation section calculates a correlation value between the added long codes and a received signal. A maximum correlation value detection section selects a group indicating the maximum correlation value, and the grouping setting section again divides the long codes included in the selected group into a plurality of groups. By the repetition of the procedures until the long codes in a group becomes one, the long code is identified.