Minimum Variance Multi-User Detection with Optimum Subband Decomposition over Multipath Channels

Wan-Shing YANG  Wen-Hsien FANG  Che-Yu LIN  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.11   pp.3075-3082
Publication Date: 2006/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.11.3075
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
minimum variance MUD,  subband decomposition,  iterative algorithm,  DS-CDMA,  

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This paper presents a linear constrained minimum variance multiuser detection (MUD) scheme for DS-CDMA systems, which makes full use of the available spreading sequences of the users as well as the relevant channel information of the incoming rays in the construction of the constraint matrix. To further enhance the performance, a statistical optimum filter bank in combination with the developed minimum variance MUD with the partitioned linear interference canceller (PLIC) as the underlying structure is also addressed. The determination of the filter bank coefficients, however, calls for computationally demanding nonlinear programming. To alleviate the computational overhead, an iterative procedure is also proposed, which solves the Rayleigh quotient in each iteration. Furthermore, the expressions of the output signal to interference plus noise ratio (SINR) are also determined to provide further insights into the proposed approach. Conducted simulations validate the new scheme.