Detection and Performance Analysis of UQPSK DSSS Signals in Satellite Communication Applications
Yiyu Zhou · Signal Processing · 2008
In digital communication systems operating over satellite links,increasing use is now being made of unbalanced quater- nary phase shift keyed(UQPSK)direct sequence spread spectrum(DSSS)signals,but very few studies have been carried out for blind detection of UQPSK DSSS signals.A method based on the second order moment of a correlation estimator is studied in the detection of UQPSK DSSS signals.The method is also able to estimate the two PN code periods of the UQPSK DSSS signal.The relationship between detection performance and signal parameters such as the input signal to noise ratio,the estimation error of the initial phase,the channel power ratio and the PN code periods is derived,and simulation results show the validity of theoretical analysis.