Experimental Verification of 1-Tap Time Domain Beamforming for P-MP Relay System via 75 GHz Band Measured CSI

Mizuki SUGA
Atsushi OHTA
Kazuto GOTO
Nobuaki OTSUKI
Naoki KITA

IEICE TRANSACTIONS on Communications   Vol.E102-B    No.8    pp.1751-1762
Publication Date: 2019/08/01
Publicized: 2019/02/06
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3268
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
massive MIMO,  5G,  millimeter waveband,  time domain beamforming,  channel measurement,  

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A propagation experiment on an actual channel is conducted to confirm the effectiveness of the 1-tap time domain beamforming (TDBF) technique we proposed in previous work. This technique offers simple beamforming for the millimeter waveband massive multiple-input multiple-output (MIMO) applied wireless backhaul and so supports the rapid deployment of fifth generation mobile communications (5G) small cells. This paper details propagation experiments in the 75GHz band and the characteristics evaluations of 1-tap TDBF as determined from actual channel measurements. The results show that 1-tap TDBF array gain nearly equals the frequency domain maximal ratio combining (MRC) value, which is ideal processing; the difference is within 0.5dB. In addition, 1-tap TDBF can improve on the signal-to-interference power ratio (SIR) by about 13% when space division multiplexing (SDM) is performed assuming existing levels of channel estimation error.