基于子空间跟踪的长码直扩序列盲估计

针对低信噪比直扩信号扩频序列（direct sequence spread spectrum,DSSS）的盲估计问题,提出了一种基于子空间跟踪的扩频波形估计算法.该方法避开了直接的特征分解求解,利用滑动窗技术取得码同步,利用子空间跟踪法分段估计扩频序列,并按照一定的顺序拼接实现伪码盲估计.结果表明,该算法在低信噪比条件下能完成对PN码序列的精确估计,降低了数据的存储量,易于硬件实现.

Blind Estimation of Long Code DSSS Signal Based on Subspace Tracking

Aiming at solving the blind estimation problem of dispreading spectrum sequence under low SNR,a spreadspectrum estimation algorithm based subspace tracking is studied in this paper.This method avoids the direct eigen decomposition,uses the sliding window technique to obtain the code synchronization,then uses segmentation subspace tracking method estimate spreading sequence and splice in a certain order to achieve pseudo-code blind estimation.The results show that the algorithm can complete the accurate estimation of PN code sequence in low SNR conditions,reduce the amount of data storage and be easy for hardware implementation.