Complex type correlator in CDMA system and initial synchronization acquiring method using the same

A method for acquiring initial synchronization using a correlator for acquiring initial synchronization, from inputted spread signal of N chips per one bit, that is provided in receiving stages of a base station and a mobile station in a CDMA system characterized by the steps of:

• shifting in turn a predetermined chips out of a spread signal to be received and outputting the shifted chips, by means of a plurality of shift registers;
• logically multiplying each shifted chip from the shift registers by each pseudo random code which is stored in a plurality of multipliers, by means of the multipliers;
• adding the multiplied results from the multipliers, by means of an adder;
• repeatedly performing accumulative adding the added results from the adder over a predetermined times and outputting the accumulated added results, by means of an accumulator;
• and
• comparing accumulated added results for the all bits of the received spread signal from the accumulator with each other and finding a bit having the most result.