NDLI: Inter-user interference suppression in time varying channel with null-space expansion for multiuser massive MIMO

Content Provider	IEEE Xplore Digital Library
Author	Iwakuni, T. Maruta, K. Ohta, A. Shirato, Y. Arai, T. Iizuka, M.
Copyright Year	2015
Description	Author affiliation: NTT Access Network Service Syst. Labs., NTT Corp., Yokosuka, Japan (Iwakuni, T.; Maruta, K.; Ohta, A.; Shirato, Y.; Arai, T.; Iizuka, M.)
Abstract	This paper proposes a novel Inter-User Interference (IUI) suppression scheme in time varying channels with null-space expansion for multiuser massive MIMO systems. The channel time variation deteriorates the accuracy of the channel state information at the transmitter (CSIT) and causes IUI on multiuser MIMO downlink transmission. In massive MIMO, the degrees of freedom (DoFs) of the base station antenna array are generally used to obtain the beamforming gain and capacity enhancement. The proposed null-space expansion scheme exploits the excess DoFs to perform additional null-steering, which extend the null-space dimension and thus suppress the IUI caused by the time varying channel. Computer simulations show that the proposed scheme has superior IUI suppression performance to existing channel prediction scheme; our scheme can improve the SIR by over 50dB.
Starting Page	558
Ending Page	562
File Size	684135
Page Count	5
File Format	PDF
e-ISBN	9781467367820
DOI	10.1109/PIMRC.2015.7343362
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-08-30
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Channel estimation Antenna arrays Arrays Multiplexing Array signal processing Null-Space Expansion Inter-User Interference Mulituser MIMO Channel Time Variation Massive MIMO
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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