Networked MIMO with clustered linear precoding
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Optimal one-shot stream scheduling for MIMO links in a single collision domain
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
An Optimization Framework for Demand-based Fair Stream Allocation in MIMO Ad Hoc Networks
Mobile Networks and Applications
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Linear beamforming for multiuser MIMO downlink systems with channel orthogonalization
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Transmit precoding for MIMO systems with partial CSI and discrete-constellation inputs
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
IEEE Transactions on Signal Processing
On the robustness of dirty paper coding
IEEE Transactions on Communications
Antenna selection in coordinated multi-cell MIMO system
CAR'10 Proceedings of the 2nd international Asia conference on Informatics in control, automation and robotics - Volume 3
Multimode transmission in network MIMO downlink with incomplete CSI
EURASIP Journal on Advances in Signal Processing - Special issue on cooperative MIMO multicell networks
Wireless Personal Communications: An International Journal
Cross-Layer Optimization of Multichannel Multiantenna WMNs
Wireless Personal Communications: An International Journal
An Improved Beamforming Method Based on SLNR for Downlink Multi-user Multi-stream MIMO System
Wireless Personal Communications: An International Journal
Hi-index | 35.69 |
Multiuser spatial multiplexing is a downlink transmission technique that uses linear transmit precoding to multiplex multiple users and precancel interuser interference. In such a system, the spatial degrees of freedom are used for interference mitigation and generally come at the expense of diversity gain. This paper proposes two precoding methods that use extra transmit antennas, beyond the minimum required, to provide additional degrees of diversity. The approach taken is to solve for a unitary transmit precoder, under a zero interuser interference constraint, that minimizes an upper bound on the symbol error rate (SER) for each user. Solutions where all transmit antennas are employed, as well as subsets of antennas (to reduce analog components), are described. Numerical results confirm a dramatic improvement in terms of SER and mutual information over single-user multiple-input multiple-output (MIMO) methods and static allocation methods. For example, the proposed techniques achieve a signal-to-noise ratio (SNR) improvement of 6-10 dB at an uncoded SER of 10-3, with only one extra transmit antenna