An Advanced Code Acquisition Technology of DSSS System

Aiming at the code acquisition problem in DSSS system under low signal to noise ratio(SNR),a differential non-coherent accumulation code acquisition technique is proposed.Performance of differential coherent and differential non-coherent code acquisition technique is researched.Simulation result shows that differential non-coherent code acquisition technique has a better capability against carrier frequency offset.On this base,the effect of modulation data on is code acquisition overcome.An advanced differential non-coherent code acquisition technique(differential non-coherent accumulation technique) is proposed.The simulation shows that the differential non-coherent accumulation code acquisition technique improves 4 dB compared with differential non-coherent code acquisition technique,and can better adapt to low SNR environment.