Patent ID: 7142587

Claim:
A received path timing detecting circuit in a receiver used in a direct spread—code division multiple access (DS-CDMA) system, comprising: a cross correlation coefficient calculator for calculating cross correlation coefficients between a received electromagnetic signal and a reference electromagnetic signal in a predetermined cycle; a differential detector that obtains real parts of products of complex conjugate numbers of respective elements of said cross correlation coefficients {R N−1,0 , R N−1,1 , R N−1,2 , . . . R N−1,M } calculated at the N−1st cycle (N is an integer) and respective elements of said cross correlation coefficients {R N,0 , R N,1 , R N,2 , . . . R N,M } calculated at the Nth cycle, and outputs said real parts as differential detection cross correlation coefficients {P N,0 , P N,1 , P N,2 , . . . ,P N,M }; an averager for averaging said differential detection cross correlation coefficients outputted from said differential detection means by a predetermined time; and a peak detector that detects one or plural peak values from said averaged cross correlation coefficients and outputs said detected one or plural peak values as said received path timing.