Title :
Accelerated subspace tracking scheme and its applications to multiuser systems
Author :
Kikuchi, Shohei ; Sano, Akira ; Ottersten, Björn
Author_Institution :
Sch. of Integrated Design Eng., Keio Univ., Yokohama
Abstract :
This paper is concerned with a new subspace tracking method by using an accelerated RLS algorithm for time-varying parameters, and its application to direction-of-arrival (DOA) estimation and blind multiuser detection (MUD) in the case that the spatial information of users rapidly changes. The proposed subspace tracker is derived by combining the projection approximation subspace tracking (PAST) with the internal model principle, approximately expressing the changing parameters with an expansion of polynomial time functions. It can still maintain the linear computational complexity to the number of users, similar to the PAST. 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
Keywords :
code division multiple access; computational complexity; direction-of-arrival estimation; multiuser detection; spread spectrum communication; time-varying systems; DOA estimation; MUD; PAST; accelerated RLS algorithm; blind multiuser detection; direction-of-arrival; linear computational complexity; narrowband source scenario; projection approximation subspace tracking; subspace tracking scheme; synchronous DS-CDMA system; time-varying parameter; Acceleration; Computational complexity; Direction of arrival estimation; Finite impulse response filter; Multiuser detection; Numerical simulation; Polynomials; Resonance light scattering; Sensor arrays; Signal processing algorithms;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on
Conference_Location :
Berlin
Print_ISBN :
9.7838007291e+012
DOI :
10.1109/PIMRC.2005.1651878