Stable transmission in the time-varying MIMO broadcast channel
EURASIP Journal on Advances in Signal Processing
Angle-of-Departure-Aided Opportunistic Space-Division Multiple Access
CNSR '09 Proceedings of the 2009 Seventh Annual Communication Networks and Services Research Conference
Spatial multi-user pairing for uplink virtual-MIMO systems with linear receiver
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Reduced feedback schemes using random beamforming in MIMO broadcast channels
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Adaptive random beamforming with interference suppression and beam selection in cellular networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Multiuser diversity beamforming for downlink channels using modulation division multiplexing
Wireless Communications & Mobile Computing
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A random beamforming technique for multiple-input multiple-output (MIMO) systems that simultaneously obtains downlink multiuser diversity gain, spatial multiplexing gain and array gain by feeding back only effective signal-to-noise ratios (SNRs) is described. In addition, power control using waterfilling is employed to improve the throughput of our method in correlated channels. In a slow fading channel, we prove that the throughput of the proposed method converges to that of eigen beamforming when many users are in a cell. The number of users required to achieve capacity bound increases with the number of antennas and SNR was determined. However, the capacity bound is achieved even with a small number of users, e.g., 16 users in a cell, when the SNR is low, e.g., 0 dB, and the number of transmit and receive antenna is small, e.g., two. We also find that the effect of waterfilling is more noticeable in correlated channels.