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《Acta Electronica Sinica》 2007-12
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Accelerated Subspace Tracking Method and Its Applications to Multiuser Systems

LI Hui,WANG Jue,YU Hong-mei(Department of Electronic Engineering,Northwestern Polytechnical University,Xi,an,Shaanxi 710072,China)  
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.
【Fund】: 航空基础科学基金(No.2006ZC53023);; 陕西省自然科学基金(No.2007F23)
【CateGory Index】: TN911.7
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