关键词: 多径信道, 伪码序列盲估计, 特征值分解, 三阶相关函数

Abstract: In order to solve the problem of blind estimation of Pseudo random（PN） code sequence for Direct Sequence Spread Spectrum（DSSS） signal in multipath channel, this paper expands the application scope of subspace method which is proposed in additive gaussian white noise channel, proposes a new algorithm combining subspace method and Triple Correlation Function（TCF） method, and carries out theoretical analysis. The algorithm’s processes are as follows: section the received multipath DSSS signal according to two times the length of PN code sequence to get a group of data vector, then structure autocorrelation matrix and do Eigenvalue Decomposition（EVD） to obtain the overlapped PN code sequence of different gains and different paths, finally, estimate the generate polynomial and PN code sequence using the TCF of m sequence. The computer simulation shows that the algorithm is effective.

Key words: multipath channel, blind estimation of Pseudo random（PN） code sequence, Eigenvalue Decomposition（EVD）, Triple Correlation Function（TCF）