Indoor Experiments of Real-Time MU-MIMO with CSI Feedback Scheme for Wireless LAN Systems

Author

Ishihara, Koichi ; Asai, Yusuke ; Kudo, Riichi ; Ichikawa, Takeo ; Mizoguchi, Masato

Author_Institution

NTT Network Innovation Labs., NTT Corp., Yokosuka, Japan

fYear

2012

fDate

6-9 May 2012

Firstpage

1

Lastpage

5

Abstract

This paper presents indoor experimental results on an implemented real-time downlink multiuser multiple-input multiple-output (DL-MU-MIMO) transceiver with a channel state information (CSI) feedback scheme for next generation wireless LAN systems. Estimated CSI is used at the access point (AP) transmitter to calculate transmit beamforming weight for DL-MU-MIMO transmission. A CSI compression scheme using discrete cosine transform (DCT) is proposed to reduce CSI feedback overhead. The transceiver performance is demonstrated and indoor experiments clarify that it is a feasible tool for real-time signal processing that improves system throughput over that of transceiver without a CSI compression scheme with simple digital signal processing of single-antenna stations (STAs).

Keywords

MIMO communication; antennas; array signal processing; discrete cosine transforms; feedback; multi-access systems; next generation networks; radio links; radio transceivers; real-time systems; wireless LAN; wireless channels; AP transmitter; CSI compression scheme; CSI feedback overhead; CSI feedback scheme; DCT; DL-MU-MIMO transceiver; DL-MU-MIMO transmission; STA; access point transmitter; channel state information; digital signal processing; discrete cosine transform; indoor experiment; next generation wireless LAN system; real-time MU-MIMO; real-time downlink multiuser multiple-input multiple-output transceiver; real-time signal processing; single-antenna station; system throughput; transceiver performance; transmit beamforming weight; Array signal processing; Discrete cosine transforms; MIMO; OFDM; Throughput; Transceivers; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th

Conference_Location

Yokohama

ISSN

1550-2252

Print_ISBN

978-1-4673-0989-9

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2012.6239998

Filename

6239998