Patent ID: 6028883
Filing Date: 2000-02-22
Classification: G01S,G06F,H04B,H04W,Y02D

Abstract:
A direct sequence spread spectrum (DSSS) signal processing architecture including a receiver for receiving at least a time segment of code division multiple access (CDMA) signals that is sufficient to allow high-reliability acquisition of the signals, said architecture comprising:a memory for storing receiver output data collected over said time segment;means for turning off the receiver after said receiver output data has been stored in said memory;means for reading said data from said memory;a code/Doppler generator for providing a segment of a replica signal;a correlator for measuring correlation between the replica segment and a segment of the receiver output data, said correlator being responsive to said receiver output data segment read from said memory and to said replica segment;detection means responsive to said correlator for detecting a predetermined correlation level; andsampling means for sampling receiver output baseband data at a non-integer oversampling rate so as to produce a sampling roll whereby an accurate correlation peak is obtained with minimal memory and a minimal sampling rate.