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Downlink sum-MSB transceiver optimization for linear multi-user MIMO systems

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

Institute of Electrical and Electronics Engineers -IEEE-:
39th Asilomar Conference on Signals, Systems and Computers 2005 : Pacific Grove, CA, 30 October - 2 November
Piscataway, NJ: IEEE, 2005
ISBN: 1-424-40131-3
Asilomar Conference on Signals, Systems and Computers <39, 2005, Pacific Grove/Calif.>
Conference Paper
Fraunhofer HHI ()

We address the problem of Mean Square Error (MSE) transceiver design for point-to-multipoint transmission in multi-user Multiple-Input-Multiple-Output (MIMO) systems. We solve the problem of minimizing the downlink sum MSE under a sum power constraint by jointly optimizing the linear transmitters and receivers. Our result is based on a "duality" between downlink and uplink MSE regions. It states that downlink and uplink share the same achievable MSE region under a sum power constraint. Thus, the problem of downlink design can be solved efficiently by focusing on an equivalent uplink problem.