Direct sequence spread spectrum transmission appts. for radio communications - uses correlator to compare signal with pseudo random signal initially used to spread signal spectrum

摘要

The appts. receives direct sequence spread spectrum signals using a primary correlator (TR1,F1) which correlates the incoming signal with the pseudo-random sequence initially used to spread the spectrum. A secondary correlator (TR2,F2) performs the same task on the signal after a delay of a period (T) corresp. to one unit of binary information. The correlator outputs are combined to remove multipath distortion and to improve transmission quality. USE/ADVANTAGE - Secure transmission of signals using DSSS methods with reduced distortion.