Title :
Efficient MSE Balancing for the Multi-User MIMO Downlink
Author :
Hunger, Raphael ; Joham, Michael ; Utschick, Wolfgang
Author_Institution :
Tech. Univ. Munchen, Munich
Abstract :
A novel MSE balancing paradigm is presented which is based on the unweighted sum-MSE minimization with individual power constraints in conjunction with an adaptive power allocation. By means of a counter-example, we show that even the two-user MSE region may be nonconvex in case of multi- antenna users which is in contrast to the predominant opinion. Any algorithm utilizing the weighted sum-MSE minimization hence cannot achieve the complete MSE region for any channel realization. This resulting gap due to the nonconvex dent is closed by the presented approach. For the unweighted sum-MSE minimization with individual power constraints which represents the core of the balancing algorithm, we come up with an extremely fast converging alternating optimization outperforming all hitherto existing approaches.
Keywords :
antenna arrays; mean square error methods; receivers; MSE balancing; adaptive power allocation; individual power constraints; multiuser MIMO downlink; unweighted sum-MSE minimization; Adaptive signal processing; Constraint optimization; Covariance matrix; Downlink; MIMO; Mean square error methods; Minimization methods; Receiving antennas; Signal processing algorithms; Signal to noise ratio;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487221