MIMO Broadcast Transmission Strategy over Fast Time-Varying Channels

Hongmei WANG
Xibin XU
Weiling WU

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.8    pp.2731-2735
Publication Date: 2008/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.8.2731
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
multiuser MIMO downlink systems,  time-varying wireless channel,  outdated channel state information (CSI),  minimum mean squared error (MMSE),  

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In time-varying channels, the channel state information available at the transmitter (CSIT) is outdated due to inherent time delay between the uplink channel estimation and the downlink data transmission in TDD systems. In this letter, we propose an iterative precoding method and a linear decoding method which are both based on minimum mean-squared error (MMSE) criteria to mitigate the interference among data streams and users created by outdated CSIT for multiuser MIMO downlink systems. Analysis and simulation results show that the proposed method can effectively reduce the impairment of the outdated CSIT and improve the system capacity.