EURASIP Journal on Advances in Signal Processing - Multiuser MIMO Transmission with Limited Feedback, Cooperation, and Coordination
Linear beamforming for multiuser MIMO downlink systems with channel orthogonalization
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Low complexity coordinated beamforming in 2-user MIMO systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Coordinated linear beamforming in downlink multi-cell wireless networks
IEEE Transactions on Wireless Communications
Low complexity non-iterative coordinated beamforming in 2-user broadcast channels
IEEE Transactions on Communications
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
CSI Feedback for Dynamic Switching Between Single User and Multiuser MIMO
Wireless Personal Communications: An International Journal
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While information theory tells us that a broadcast multiple-input multiple-output (MIMO) channel may be shared spatially to maximize the utilization of the channel by dirty-paper coding (DPC) techniques as opposed to time-only or frequency-only division, the associated complexity of a DPC codec is problematic for some practical applications. A more feasible alternative is to use generalized zeroforcing (GZF) which beams the signals to the targeted receivers while ensuring no inter-user interference at all the receiver outputs. Our objective of this letter is to study the GZF optimization of a broadcast 2-user 2-input many-output antenna system for both 1) sum-rate maximization subject to a total transmit power constraint and 2) sum-power minimization subject to rate constraints of the users. We shall derive the optimal GZF solutions for both problems. The capacity and signal-to-noise ratio (SNR) regions for the optimized GZF systems are also derived, and results for DPC and time-division systems are provided for comparisons