LAUSR

In this paper, a user selection problem for multiuser multiple-input multiple-output systems in the general wireless environment with full-rank and rank-deficient channel users is investigated. It is demonstrated that the maximum number of simultaneously supportable users is elastic, and the spatial resources occupied by each user can be squeezed in the rank-deficient environment. Therefore, a user selection algorithm is then proposed with relatively low computational overhead. The data rate requirement distinctions of different services are considered in the user selection criterion, and the resources occupied by real-time service users are primarily squeezed since they do not need extremely high data rate. Numerical results show that the effective throughput and the number of selected users achieved by the proposed user selection algorithm are larger than that of exiting researches.