Iterative Minimum Mean Square Error Interference Alignment Scheme for the MIMO X Channel

Hui SHEN  Bin LIN  Yi LUO  Feng LIU  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.5   pp.1348-1354
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1348
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
MIMO X channel,  interference alignment,  joint transceiver,  iterative algorithm,  

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In this paper, we propose a new interference alignment (IA) scheme that jointly designs the linear transmitter and receiver for the 2-user MIMO X channel system, using minimum total mean square error criterion, subject to each transmitter power constraint. We show that transmitters and receivers under such criteria could be realized through a joint iterative algorithm. Considering the imperfection of channel state information (CSI), we also extend the minimum mean square error interference alignment schemes for the MIMO X channel with CSI estimation error. A robust iterative algorithm which is insensitve to CSI estimation error is proposed. Simulation results are also provided to demonstrate the proposed algorithm.