Throughput versus fairness: channel-aware scheduling in multiple antenna downlink
EURASIP Journal on Wireless Communications and Networking - Special issue on fairness in radio resource management for wireless networks
Mode switching for the multi-antenna broadcast channel based on delay and channel quantization
EURASIP Journal on Advances in Signal Processing - Multiuser MIMO Transmission with Limited Feedback, Cooperation, and Coordination
Reduced feedback SDMA based on subspace packings
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Wireless Personal Communications: An International Journal
Optimization Decomposition for Scheduling and System Configuration in Wireless Networks
IEEE/ACM Transactions on Networking (TON)
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In this work, we analyze opportunistic beamforming with finite number of single-antenna users under the constraint that the feedback overhead from the mobiles to the base is constant. First, we characterize the impact of the fading variances of the users and the spatial correlation on the sum rate of TDMA based opportunistic beamforming using majorization theory. Further, we describe quantitatively the high-SNR behavior in terms of throughput slope and power offset. Next, the impact of the fading variances of the users on an upper bound of the sum rate for space division multiple access (SDMA) based opportunistic beamforming is derived which is tight for high SNR. We propose to adapt the number of active beams to the SNR and the number of active users in a cell and illustrate the corresponding optimization problem by simulations.