逼近幂迭代子空间跟踪算法在多用户系统中的应用研究

本文将基于逼近幂迭代的子空间跟踪算法应用于多用户系统中.该算法利用适当的补偿矩阵逼近经典幂迭代子空间跟踪方法,在不增加计算复杂度的基础上保证了算法的全局收敛.将该算法应用于波达方向(DOA)估计及盲多用户检测系统中,利用接收的数据矢量估计信号子空间,进而可得到DOA的精确估计及检测器的权向量.仿真验证了算法在多用户系统中的有效性.

Accelerated Subspace Tracking Method and Its Applications to Multiuser Systems

This paper focuses on a fast subspace tracking algorithm-approximated power iterations(API) algorithm,and its application to direction-of-arrival(DOA) estimation and blind multiuser detection(MUD) in CDMA system.The algorithm is derived by exerting an approximation on the power iterations method,which guarantees the orthonormality of the estimated subspace at each iteration,and satisfies a global convergence property.Its performance outperforms many subspace tracking algorithms,such as the projection approximation subspace tracking(PAST) method,the novel information criterion(NIC) method,and the Orthonormal PAST(OPAST) method,while keeping the same computational complexity as the above mentioned algorithms.The effectiveness is validated through some numerical simulations of DOA estimation in a narrowband source scenario and blind MUD in a synchronous DS-CDMA system,respectively.