Patent ID: 6842475

Claim:
An apparatus for acquisition of a direct-sequence/code division multiple access signal, which acquires a long code from a direct-sequence/code division multiple access control channel signal, in which a common short code and the long code are transmitted within one frame, and a group identification code indicating a code group, to which a base station belongs, are combined and transmitted with the common short code comprising: a long code masking correlation portion for correlating common short codes generated internally and the control channel signal; a differentially coherent combining portion for deciding whether acquisition of the common short code is achieved or not by multiplying a complex conjugate value of a previous output of the long code masking correlation portion by a present output of the long code masking correlation portion, by accumulating the results of multiplication during a predetermined time and by taking an absolute value of the accumulated value; a code group and frame timing acquisition portion for acquiring the code group and frame timing by correlating each group identification code, which can be generated according to a coherence of the common short code output from the differentially coherent combining portion, and the received group identification codes respectively, and by combining each correlation result; and a long code acquisition portion for acquiring the long code by correlating the long codes belonging to the acquired code group and the received long code respectively.