摘要
针对扩频序列周期不为信息码宽整数倍的多用户周期长码直扩信号,提出一种基于平行因子的长码直扩信号扩频序列估计方法。将周期长码直扩信号建模为缺失的短码直扩信号模型,利用插补法和交替三线性分解(ATLD)迭代算法估计扩频序列,在此基础上利用直接三线性分解(DTLD)算法设置初始矩阵,大大提高了多用户周期长码直扩信号的扩频序列估计性能和速度。
When the PN code period isn＆#39;t an integer multiple of the width of information code , the spread spectrum code estimation algorithm based on PARAFAC algorithm of long-code DSSS signal of multi-users is presented .Firstly the long-code DSSS signal is modeled as missing short-code DSSS signal .And then the imputation method and the alternating trilinear decomposition （ ATLD） algorithm are utilized to estimate the spread spectrum code of the long-code DSSS signal .Lastly the direct trilinear decomposition （ DTLD） algorithm is used to initialize the matrices .The performance and speed of the spread spectrum code estimation algorithm of the long-code DSSS signal of multi-users are greatly improved .
关键词
长码直扩
扩频序列
交替三线性分解
直接三线性分解
平行因子
long-code direct sequence spread spectrum signal
the spread spectrum code
alternating trilinear decomposition
direct trilinear decomposition
parallel factor
