The downlink transmission in multi-usermultipleinput multiple-output (mimo) systems has been extensively studied from both communication-theoretic and information-theoretic *** of these papers assume perfect/imperfec...
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The downlink transmission in multi-usermultipleinput multiple-output (mimo) systems has been extensively studied from both communication-theoretic and information-theoretic *** of these papers assume perfect/imperfect channel *** general,the problem of channel estimation is studied ***,in interference-limited communication systems with high mobility,the problem of channel estimation is tightly coupled with the problem of maximizing throughput of the *** this paper,scheduling and preconditioning in the presence of reciprocal time-division duplex (tdd) training are *** the case of homogeneous users,a scheduling scheme is proposed and an improved lower bound on the sum capacity is *** problem of choosing training sequence length to maximize net throughput of the system is also *** the case of heterogeneous users,a modified pre-conditioning method is proposed and an optimized pre-conditioning matrix is *** method is combined with a scheduling scheme to further improve achievable weighted-sum rate.
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