Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
On downlink beamforming with greedy user selection: performance analysis and a simple new algorithm
IEEE Transactions on Signal Processing - Part I
Zero-forcing methods for downlink spatial multiplexing in multiuser MIMO channels
IEEE Transactions on Signal Processing
Antenna combining for the MIMO downlink channel
IEEE Transactions on Wireless Communications
Grassmannian beamforming for multiple-input multiple-output wireless systems
IEEE Transactions on Information Theory
MIMO Broadcast Channels With Finite-Rate Feedback
IEEE Transactions on Information Theory
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming
IEEE Journal on Selected Areas in Communications
Limited feedback-based block diagonalization for the MIMO broadcast channel
IEEE Journal on Selected Areas in Communications
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In this paper, a practical downlink multiuser multiple-input multiple-output (MU-MIMO) scheme with low-rate feedback channel is considered. Firstly, we propose a preferred-beam feedback method, which effectively conveys information of user channel and inter-user interference. Secondly, we propose a new low-complexity method to compute unitary preprocessing matrix based on the feedback method. The proposed method reduces considerably computational complexity by utilizing SVD operation compared to the conventional unitary preprocessing scheme. Finally, for the case that the number of users exceeds the number of transmit antennas, we provide two simple user selection algorithms to exploit multiuser diversity. Numerical results show that the proposed low-complexity unitary preprocessing scheme achieves higher sum-rate than previous linear preprocessing schemes, especially at low SNR or with small number of active users.