中文摘要：

该文研究可变扩频长度（Variable Spreading Length，VSL）多速率直接序列码分多址（Direct-Sequence Code-Division Multiple—Access，DS—CDMA）系统中的白适应多用户接收机。利用到相交子空间的迭代投影估计得到包含信道信息的特征矢量，以此构造多用户接收机。借助于子空间跟踪算法的特殊形式，推导了特征矢量估计算法及多用户接收机的一种低复杂度的白适应实现。仿真实验证明，该算法有很好的数值稳定性，与传统算法BER性能相同的情况下，具有更低的计算复杂度。

英文摘要：

In this paper, an adaptive multiuser receiver for variable spreading length direct-sequence codedivision multiple-access systems in multi-path channel is proposed. The signature vectors are estimated by projection onto the intersectant subspaces. Based on the estimated signature vectors, the multiuser detector is constructed. By exploiting the structure of the subspace tracking algorithm, the low-complexity adaptive signature vectors estimator and multiuser receiver are developed. Simulation results demonstrate that the proposed algorithm has the same performance, but lower computational complexity compared with the reference algorithm.