MIMO Broadcast Transmission Strategy over Fast Time-Varying Channels

Hongmei WANG; Xibin XU; Ming ZHAO; Weiling WU; Yan YAO

doi:10.1093/ietcom/e91-b.8.2731

Regular Section

MIMO Broadcast Transmission Strategy over Fast Time-Varying Channels

Hongmei WANG, Xibin XU, Ming ZHAO, Weiling WU, Yan YAO

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Keywords: multiuser MIMO downlink systems, time-varying wireless channel, outdated channel state information (CSI), minimum mean squared error (MMSE)

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2008 Volume E91.B Issue 8 Pages 2731-2735

DOI https://doi.org/10.1093/ietcom/e91-b.8.2731

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Abstract

In time-varying channels, the channel state information available at the transmitter (CSIT) is outdated due to inherent time delay between the uplink channel estimation and the downlink data transmission in TDD systems.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on minimum mean-squared error (MMSE) criteria to mitigate the interference among data streams and users created by outdated CSIT for multiuser MIMO downlink systems. Analysis and simulation results show that the proposed method can effectively reduce the impairment of the outdated CSIT and improve the system capacity.

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