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User ordering and power allocation for optimal multiantenna precoding/decoding

: Schubert, M.; Boche, H.


Informationstechnische Gesellschaft -ITG-; IEEE Signal Processing Society; TU München, Lehrstuhl für Netzwerktheorie und Signalverarbeitung:
ITG Workshop on Smart Antennas 2004. Proceedings : March 18th - 19th 2004, Munich University of Technology, Germany
Piscataway, NJ: IEEE Operations Center, 2004
ISBN: 0-7803-8327-3
Workshop on Smart Antennas <2004, München>
Conference Paper
Fraunhofer HHI ()

The performance of multiuser beamforming combined with 'Dirty Paper' precoding (downlink) or successive interference cancellation (uplink) depends on the precoding (resp. decoding) order. In this paper we propose an improved algorithm for jointly computing the power allocation and beamformers with minimal total power. Neither matrix inversion nor eigenvalue decomposition is required to compute the global optimum. Then, the optimal precoding order is studied. A fundamental understanding of joint precoding and power allocation will be an important prerequisite for the development of transmit scheduling algorithms.