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Trace balancing for multiuser MIMO downlink transmission

: Boche, H.; Schubert, M.; Jorswieck, E.A.

Matthews, M.B. ; Naval Postgraduate School, Monterey/Calif.:
Thirty-Sixth Asilomar Conference on Signals, Systems & Computers 2002. Conference record. Vol.2 : November 3 - November 6, 2002, Pacific Grove, California
Piscataway, NJ: IEEE Operations Center, 2002
ISBN: 0-7803-7576-9
Asilomar Conference on Signals, Systems and Computers <36, 2002, Pacific Grove/Calif.>
Conference Paper
Fraunhofer HHI ()

We consider the problem of balancing individual capacities in a multi-user MIMO downlink channel. If perfect channel state information is available at the base station, the rates of all users can be jointly controlled by adjusting the transmit covariance matrices. We propose a new transmission strategy based on trace balancing, which is optimal in the low SNR regime. Otherwise, it provides an approximation. An iterative algorithm is proposed, which rapidly converges to the global optimum of the trace balancing problem.