IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Regular Section
Experimental Verification of Null-Space Expansion for Multiuser Massive MIMO via Channel State Information Measurement
Tatsuhiko IWAKUNIKazuki MARUTAAtsushi OHTAYushi SHIRATOMasataka IIZUKA
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2018 Volume E101.B Issue 3 Pages 877-884

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Abstract

This paper presents experimental results of our proposed null-space expansion scheme for multiuser massive multiple-input multiple-output (MIMO) in time varying channels. Multiuser MIMO transmission with the proposed scheme can suppress the inter-user interference (IUI) caused by outdated channel state information (CSI). The excess degrees of freedom (DoFs) of massive MIMO is exploited to perform additional null-steering using past estimated CSI. The signal-to-interference power ratio (SIR) and spectral efficiency performances achieved by the proposed scheme that uses measured CSI is experimentally evaluated. It is confirmed that the proposed scheme shows performance superior to the conventional channel prediction scheme. In addition, IUI can be stably suppressed even in high mobility environments by further increasing the null-space dimension.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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