非周期长码直扩信号的盲解扩

Blind Despreading of Non-periodic Long Code Direct-Sequence Spread-Spectrum Signals

本文利用信号延迟相乘,消除信息码对长扰码和扩频码的影响;利用m序列的线性移位叠加性,巧妙分段信号,提出一种分段相关的信号解扰方法;对解扰信号利用斜消矩阵法估计扩频序列本原多项式,并利用基于协方差范数的信息码盲同步法实现信息码同步;最终得到非周期长码直扩信号盲解扩方法。该方法仅需要预知信号扰码m序列本原多项式和扩频码码片速率。仿真结果表明,该算法仅利用1/8倍长码序列周期长度的信号就能在信噪比3.6dB以上达到10-2以下解扩误码率。

In this paper, the processing of delay and multiplication is utilized to eliminate the influence of the informa- tion code on long code sequence and short code sequence and the signal is segmented in an ingenious way, and a subsection cross-correlation method to descramble is proposed to obtain the long code sequence of non-periodic long code direct se- quence spread spectral （NPLCDS-SS） signals by using the shift-and-add property of m-sequence. The primitive polynomial of the short code is estimated by using the matrix＇ s oblique elementary method and the information code synchronization is realized by utilizing the information code blind synchronization method based on covariance norm. Finally a dispreading method of NPLCDS-SS signal is obtained. Simulations results shown that the bits error rate of this method is below 10-2, when the signal-to-noise ratio is greater than 3.6dB and the signal length is only one-eighth of the period of the long code