A method for the detection of long pseudo-random code DSSS signals based on the processing of delay-multiply (II) - the estimation of the information symbol period and the pseudo-random code sequence

Aiming at the problems of the detection of the pseudo-random code sequence and the information symbol period of long pseudo-random code DSSS (direct sequence spread spectral) signals, the paper proposes a method based on the processing of delay-multiply. The method does processing of chip-delay-multiply on the received signals at first, then does correlation matrix analysis and gets an estimation sequence of the relative transform sequence of pseudo-random code which is used by the long pseudo-random code DSSS system. The computer simulations show that the proposed method can work well in the context of low signal to noise ratio, by it we can not only retrieve the pseudo-random code sequence of the long pseudo-random code DSSS signals, but also can get an estimation of the information symbol period and the synchronization information of the information symbol.