IEEE Transactions on Communications
Output MAI distributions of linear MMSE multiuser receivers in DS-CDMA systems
IEEE Transactions on Information Theory
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
From theory to practice: an overview of MIMO space-time coded wireless systems
IEEE Journal on Selected Areas in Communications
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming
IEEE Journal on Selected Areas in Communications
IEEE Transactions on Communications
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In this paper, we focus on the asymptotic cross layer analysis of multi-antenna systems with transmit MMSE (Tx-MMSE) beamforming, near orthogonal scheduling and outdated CSIT. To capture the effect of the potential packet outage, we introduce the average system goodput, which measures the average b/s/Hz delivered to the mobiles successfully, as the system performance objective. We derive closed-form expressions for the optimal power and rate allocations as well as a low complexity near orthogonal user scheduling (NEOUS) algorithm to solve the cross-layer optimization problem. We derive the asymptotic order of growth in system goodput for general CSIT error variance σ2 and found that for sufficiently large nT (number of antennas at the base station) and K (number of users) where K = g-1(nT) for some strictly increasing function g(x) = o(x), the system goodput grows in the order of nT log[(1-σ2) log K] when σ2 K to compensate for the penalty in multiuser diversity gain due to CSIT errors.